Added TabFrame component.

build.gradle

@@ -20,6 +20,7 @@ dependencies {
     compile 'com.metsci.ext.com.kitfox.svg:svg-salamander:[0.1.19,)'
     compile 'org.jetbrains:annotations:16.0.1'
     compile 'net.java.dev.jna:jna:4.1.0'
+    compile 'org.swinglabs:jxlayer:3.0.4'
     compileOnly 'org.swinglabs:swingx:1.6.1'
     testCompile 'org.swinglabs:swingx:1.6.1'
 }

darklaf.iml

@@ -4,6 +4,7 @@
     <content url="file://$MODULE_DIR$">
       <excludeFolder url="file://$MODULE_DIR$/.gradle" />
       <excludeFolder url="file://$MODULE_DIR$/build" />
+      <excludeFolder url="file://$MODULE_DIR$/out" />
       <excludeFolder url="file://$MODULE_DIR$/target" />
     </content>
     <orderEntry type="inheritedJdk" />

src/main/java/com/weis/darklaf/components/Insets2D.java

@@ -0,0 +1,104 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components;
+
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+
+public final class Insets2D implements Cloneable {
+
+    public double top;
+    public double left;
+    public double bottom;
+    public double right;
+
+    /**
+     * Creates and initializes a new <code>Insets</code> object with the
+     * specified top, left, bottom, and right insets.
+     *
+     * @param top    the inset from the top.
+     * @param left   the inset from the left.
+     * @param bottom the inset from the bottom.
+     * @param right  the inset from the right.
+     */
+    @Contract(pure = true)
+    public Insets2D(final double top, final double left, final double bottom, final double right) {
+        this.top = top;
+        this.left = left;
+        this.bottom = bottom;
+        this.right = right;
+    }
+
+    /**
+     * Set top, left, bottom, and right to the specified values
+     *
+     * @param top    the inset from the top.
+     * @param left   the inset from the left.
+     * @param bottom the inset from the bottom.
+     * @param right  the inset from the right.
+     * @since 1.5
+     */
+    public void set(final double top, final double left, final double bottom, final double right) {
+        this.top = top;
+        this.left = left;
+        this.bottom = bottom;
+        this.right = right;
+    }
+
+    @Contract(pure = true)
+    @Override
+    public int hashCode() {
+        double sum1 = left + bottom;
+        double sum2 = right + top;
+        double val1 = sum1 * (sum1 + 1) / 2 + left;
+        double val2 = sum2 * (sum2 + 1) / 2 + top;
+        double sum3 = val1 + val2;
+        return (int) (sum3 * (sum3 + 1) / 2 + val2);
+    }
+
+    @Contract(value = "null -> false", pure = true)
+    @Override
+    public boolean equals(final Object obj) {
+        if (obj instanceof Insets2D) {
+            Insets2D insets = (Insets2D) obj;
+            return ((top == insets.top) && (left == insets.left) &&
+                    (bottom == insets.bottom) && (right == insets.right));
+        }
+        return false;
+    }
+
+    @NotNull
+    @Contract(value = " -> new", pure = true)
+    @Override
+    public Insets2D clone() {
+        return new Insets2D(top, left, bottom, right);
+    }
+
+    @NotNull
+    public String toString() {
+        return getClass().getName() + "[top=" + top + ",left=" + left + ",bottom=" + bottom + ",right=" + right + "]";
+    }
+
+
+}

src/main/java/com/weis/darklaf/components/JLabelUIResource.java

@@ -0,0 +1,54 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components;
+
+import javax.swing.*;
+import javax.swing.plaf.UIResource;
+
+public class JLabelUIResource extends JLabel implements UIResource {
+
+    public JLabelUIResource(final String text, final int horizontalAlignment) {
+        this(text, null, horizontalAlignment);
+    }
+
+    public JLabelUIResource(final String text, final Icon icon, final int horizontalAlignment) {
+        super(text, icon, horizontalAlignment);
+    }
+
+    public JLabelUIResource(final String text) {
+        this(text, null, LEADING);
+    }
+
+    public JLabelUIResource(final Icon image, final int horizontalAlignment) {
+        this(null, image, horizontalAlignment);
+    }
+
+    public JLabelUIResource(final Icon image) {
+        this(null, image, CENTER);
+    }
+
+    public JLabelUIResource() {
+        this("", null, LEADING);
+    }
+}

src/main/java/com/weis/darklaf/components/JPanelUIResource.java

@@ -0,0 +1,47 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components;
+
+import javax.swing.*;
+import javax.swing.plaf.UIResource;
+import java.awt.*;
+
+public class JPanelUIResource extends JPanel implements UIResource {
+
+    public JPanelUIResource(final LayoutManager layout) {
+        this(layout, true);
+    }
+
+    public JPanelUIResource(final LayoutManager layout, final boolean isDoubleBuffered) {
+        super(layout, isDoubleBuffered);
+    }
+
+    public JPanelUIResource() {
+        this(true);
+    }
+
+    public JPanelUIResource(final boolean isDoubleBuffered) {
+        this(new FlowLayout(), isDoubleBuffered);
+    }
+}

src/main/java/com/weis/darklaf/components/UIResourceWrapper.java

@@ -0,0 +1,56 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components;
+
+import javax.swing.border.Border;
+import java.awt.*;
+
+public class UIResourceWrapper extends JPanelUIResource {
+
+    public UIResourceWrapper(final Component component) {
+        super(new BorderLayout());
+        super.setOpaque(false);
+        super.setBorder(null);
+        add(component, BorderLayout.CENTER);
+    }
+
+    @Override
+    public void setBorder(final Border border) {
+        super.setBorder(null);
+    }
+
+    @Override
+    public void setOpaque(final boolean isOpaque) {
+    }
+
+    @Override
+    public boolean isOpaque() {
+        return false;
+    }
+
+    @Override
+    public Border getBorder() {
+        return null;
+    }
+}

src/main/java/com/weis/darklaf/components/border/MutableLineBorder.java

@@ -57,4 +57,18 @@ public class MutableLineBorder extends EmptyBorder {
     public void setBottom(final int bottom) {
         this.bottom = bottom;
     }
+
+    public void setInsets(final int top, final int left, final int bottom, final int right) {
+        setTop(top);
+        setBottom(bottom);
+        setLeft(left);
+        setRight(right);
+    }
+
+    public static class UIResource extends MutableLineBorder implements javax.swing.plaf.UIResource {
+
+        public UIResource(final int top, final int left, final int bottom, final int right, final Color color) {
+            super(top, left, bottom, right, color);
+        }
+    }
 }

src/main/java/com/weis/darklaf/components/tabframe/PanelPopup.java

@@ -0,0 +1,213 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components.tabframe;
+
+import com.weis.darklaf.components.alignment.Alignment;
+import org.jetbrains.annotations.Contract;
+
+import javax.swing.*;
+import java.awt.*;
+
+/**
+ * Popup Component for {@link TabFrame}.
+ *
+ * @author Jannis Weis
+ * @since 2019
+ */
+public class PanelPopup extends JPanel implements TabFramePopup {
+
+    private Component content;
+    private boolean open;
+    private TabFrame parent;
+    private String title;
+    private Icon icon;
+    private Alignment alignment;
+    private int index;
+
+    /**
+     * Creates a new Popup that holds one component.
+     *
+     * @param title   the title of the component.
+     * @param content the content of the popup.
+     */
+    public PanelPopup(final String title, final Component content) {
+        this(title, null, content);
+    }
+
+    /**
+     * Creates a new Popup that holds one component.
+     *
+     * @param title   the title of the component.
+     * @param icon    the icon of the popup.
+     * @param content the content of the popup.
+     */
+    public PanelPopup(final String title, final Icon icon, final Component content) {
+        setIcon(icon);
+        setTitle(title);
+        setContentPane(content);
+        setEnabled(false);
+    }
+
+    @Override
+    public String getUIClassID() {
+        return "TabFramePanelPopupUI";
+    }
+
+    @Override
+    public Dimension getSize(final Dimension rv) {
+        if (!isEnabled()) {
+            return new Dimension(0, 0);
+        }
+        return super.getSize();
+    }
+
+    @Override
+    public int getWidth() {
+        if (!isEnabled()) {
+            return 0;
+        }
+        return super.getWidth();
+    }
+
+    @Override
+    public int getHeight() {
+        if (!isEnabled()) {
+            return 0;
+        }
+        return super.getHeight();
+    }
+
+    @Override
+    public Component getContentPane() {
+        if (content == null) {
+            setContentPane(null);
+        }
+        return content;
+    }
+
+    @Override
+    public void setContentPane(final Component component) {
+        var old = this.content;
+        this.content = component;
+        if (content == null) {
+            content = new JPanel();
+        }
+        firePropertyChange("content", old, content);
+    }
+
+    @Override
+    public Component getComponent() {
+        return this;
+    }
+
+    @Override
+    public void close() {
+        if (parent != null && getAlignment() != null && getIndex() >= 0) {
+            var oldOpen = isOpen();
+            parent.closeTab(getAlignment(), getIndex());
+            open = false;
+            firePropertyChange("open", oldOpen, false);
+        }
+    }
+
+    @Contract(pure = true)
+    private boolean isOpen() {
+        return open;
+    }
+
+    @Override
+    public TabFrame getTabFrame() {
+        return parent;
+    }
+
+    @Override
+    public void setTabFrame(final TabFrame parent) {
+        var old = this.parent;
+        this.parent = parent;
+        firePropertyChange("tabFrame", old, parent);
+    }
+
+    @Override
+    public Alignment getAlignment() {
+        return alignment;
+    }
+
+    @Override
+    public void setAlignment(final Alignment alignment) {
+        if (alignment == null || this.alignment == Alignment.CENTER) {
+            throw new IllegalArgumentException("Illegal alignment: " + (alignment != null
+                                                                        ? alignment.toString() : "null"));
+        }
+        var old = this.alignment;
+        this.alignment = alignment;
+        firePropertyChange("alignment", old, alignment);
+    }
+
+    @Override
+    public void open() {
+        if (parent != null && getAlignment() != null && getIndex() >= 0) {
+            var oldOpen = isOpen();
+            parent.openTab(getAlignment(), getIndex());
+            open = true;
+            firePropertyChange("open", oldOpen, true);
+            requestFocus();
+        }
+    }
+
+    @Override
+    public String getTitle() {
+        return title;
+    }
+
+    @Override
+    public void setTitle(final String title) {
+        var old = this.title;
+        this.title = title == null ? "" : title;
+        firePropertyChange("title", old, this.title);
+    }
+
+    @Override
+    public Icon getIcon() {
+        return icon;
+    }
+
+    @Override
+    public void setIcon(final Icon icon) {
+        var old = this.icon;
+        this.icon = icon;
+        firePropertyChange("icon", old, icon);
+    }
+
+    @Override
+    public int getIndex() {
+        return index;
+    }
+
+    @Override
+    public void setIndex(final int index) {
+        int old = this.index;
+        this.index = index;
+        firePropertyChange("index", old, index);
+    }
+}

src/main/java/com/weis/darklaf/components/tabframe/PopupContainer.java

@@ -0,0 +1,67 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components.tabframe;
+
+import javax.swing.*;
+import javax.swing.border.Border;
+import java.awt.*;
+
+/**
+ * Holder component.
+ *
+ * @author Jannis Weis
+ */
+public class PopupContainer extends JPanel {
+
+    private Component popup;
+
+    public PopupContainer() {
+        super(new BorderLayout());
+        super.setBorder(null);
+    }
+
+    public Component getPopup() {
+        return popup;
+    }
+
+    @Override
+    public void setBorder(final Border border) {
+        super.setBorder(null);
+    }
+
+    public void setPopup(final Component component) {
+        removeAll();
+        add(component, BorderLayout.CENTER);
+        this.popup = component;
+        revalidate();
+        repaint();
+        component.doLayout();
+    }
+
+
+    @Override
+    public Border getBorder() {
+        return null;
+    }
+}

src/main/java/com/weis/darklaf/components/tabframe/TabArea.java

@@ -0,0 +1,45 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components.tabframe;
+
+import org.jetbrains.annotations.NotNull;
+
+import javax.swing.*;
+import java.awt.*;
+
+public final class TabArea extends JPanel {
+
+    public TabArea() {
+        setLayout(null);
+        setOpaque(true);
+    }
+
+    @Override
+    public void paint(@NotNull final Graphics g) {
+        g.setColor(getBackground());
+        g.fillRect(0, 0, getWidth(), getHeight());
+        paintChildren(g);
+        paintBorder(g);
+    }
+}

src/main/java/com/weis/darklaf/components/tabframe/TabFrame.java

@@ -0,0 +1,862 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components.tabframe;
+
+import com.weis.darklaf.components.alignment.Alignment;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+
+import javax.swing.*;
+import javax.swing.plaf.ComponentUI;
+import java.awt.*;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * Frame that supports popup components.
+ *
+ * @author Jannis Weis
+ */
+public class TabFrame extends JComponent {
+
+    private final JComponent bottomTabs = createTabContainer();
+    private final JComponent topTabs = createTabContainer();
+    private final JComponent leftTabs = createTabContainer();
+    private final JComponent rightTabs = createTabContainer();
+
+    private final TabFrameContent content = createContentPane();
+
+    private final List<TabFrameTab>[] tabLists;
+    private final List<TabFramePopup>[] popupLists;
+    private final int[] selectedIndices;
+
+    private int tabSize = -1;
+    private int maxTabWidth = -1;
+
+    /**
+     * Creates new {@link TabFrame}.
+     * A TabFrame displays one center component and multiple popups around
+     * that can be toggles with a TabbedPane like tabArea along the border.
+     */
+    public TabFrame() {
+        super();
+        updateUI();
+        add(content.getComponent());
+
+        int count = Alignment.values().length;
+        //noinspection unchecked
+        tabLists = (ArrayList<TabFrameTab>[]) new ArrayList[count];
+        //noinspection unchecked
+        popupLists = (ArrayList<TabFramePopup>[]) new ArrayList[count];
+        for (int i = 0; i < count; i++) {
+            tabLists[i] = new ArrayList<>();
+            popupLists[i] = new ArrayList<>();
+        }
+        selectedIndices = new int[count];
+    }
+
+    @Override
+    public void updateUI() {
+        setUI(UIManager.getUI(this));
+    }
+
+    /**
+     * Get the ui.
+     *
+     * @return the ui.
+     */
+    public TabFrameUI getUI() {
+        return (TabFrameUI) super.getUI();
+    }
+
+    @Override
+    protected void setUI(final ComponentUI newUI) {
+        if (!(newUI instanceof TabFrameUI)) {
+            throw new IllegalArgumentException("UI class must be of type TabFrameUI");
+        }
+        super.setUI(newUI);
+    }
+
+    @Override
+    public String getUIClassID() {
+        return "TabFrameUI";
+    }
+
+    /**
+     * Returns the height/width of the tab container.
+     *
+     * @return the tab size.
+     */
+    public int getTabSize() {
+        return tabSize >= 0 ? tabSize : getUI().getTabSize(this);
+    }
+
+    /**
+     * Sets the height/width of the tab container.
+     * <p>
+     * A negative value means the ui should calculate the appropriate size.
+     *
+     * @param size the size of the tab container.
+     */
+    public void setTabSize(final int size) {
+        this.tabSize = size;
+    }
+
+    /**
+     * Get the maximum width a tab can inhibit.
+     * A negative value indicated the tabs should use as much space as
+     * their proffered size indicates.
+     *
+     * @return the maximum tab width.
+     */
+    public int getMaxTabWidth() {
+        return maxTabWidth;
+    }
+
+    /**
+     * Sets the maximum width a tab can inhibit.
+     * A negative value indicated the tabs should use as much space as
+     * their proffered size indicates.
+     *
+     * @param maxTabWidth the maximum tab width.
+     */
+    public void setMaxTabWidth(final int maxTabWidth) {
+        this.maxTabWidth = maxTabWidth;
+    }
+
+    /**
+     * Get the number of tabs at the top.
+     *
+     * @return number of tabs at the top.
+     */
+    public int getTopTabCount() {
+        return getTabCountAt(Alignment.NORTH) + getTabCountAt(Alignment.NORTH_EAST);
+    }
+
+    /**
+     * Get the number of tabs at the given alignment position.
+     *
+     * @param a the alignment position.
+     * @return number of tabs.
+     */
+    public int getTabCountAt(final Alignment a) {
+        return tabsForAlignment(a).size();
+    }
+
+    /**
+     * Get a list of tab components at the given alignment position.
+     *
+     * @param a the alignment position.
+     * @return list of tab components at position.
+     */
+    public List<TabFrameTab> tabsForAlignment(@NotNull final Alignment a) {
+        return tabLists[a.ordinal()];
+    }
+
+    /**
+     * Get the number of tabs at the bottom.
+     *
+     * @return number of tabs at the bottom.
+     */
+    public int getBottomTabCount() {
+        return getTabCountAt(Alignment.SOUTH) + getTabCountAt(Alignment.SOUTH_WEST);
+    }
+
+    /**
+     * Get the number of tabs at the left.
+     *
+     * @return number of tabs at the left.
+     */
+    public int getLeftTabCount() {
+        return getTabCountAt(Alignment.WEST) + getTabCountAt(Alignment.NORTH_WEST);
+    }
+
+    /**
+     * Get the number of tabs at the right.
+     *
+     * @return number of tabs at the right.
+     */
+    public int getRightTabCount() {
+        return getTabCountAt(Alignment.EAST) + getTabCountAt(Alignment.SOUTH_EAST);
+    }
+
+    /**
+     * Get the center component.
+     *
+     * @return the center component.
+     */
+    public Component getContent() {
+        return content.getContent();
+    }
+
+    /**
+     * Set the center component.
+     *
+     * @param c the center component.
+     */
+    public void setContent(final Component c) {
+        content.setContent(c);
+    }
+
+    /**
+     * Get the content pane.
+     *
+     * @return the content pane.
+     */
+    public TabFrameContent getContentPane() {
+        return content;
+    }
+
+    /**
+     * Create a tab container.
+     *
+     * @return a tab container.
+     */
+    protected JComponent createTabContainer() {
+        return new TabArea();
+    }
+
+    /**
+     * Create the content pane.
+     *
+     * @return the content pane.
+     */
+    protected TabFrameContent createContentPane() {
+        return new TabFrameContentPane();
+    }
+
+    /**
+     * Insert a tab.
+     * A default tab component and popup component will be created.
+     *
+     * @param c     the component to add.
+     * @param a     the alignment position to add at.{@link TabFramePosition#getAlignment()}
+     * @param index the index to insert at.{@link TabFramePosition#getIndex()}
+     */
+    public void insertTab(@NotNull final Component c, final Alignment a, final int index) {
+        var title = c.getName();
+        insertTab(c, title == null ? "" : title, a, index);
+    }
+
+    /**
+     * Insert a tab.
+     * A default tab component and popup component will be created.
+     *
+     * @param c     the component to add.
+     * @param title the title of the component.
+     * @param a     the alignment position to add at.{@link TabFramePosition#getAlignment()}
+     * @param index the index to insert at.{@link TabFramePosition#getIndex()}
+     */
+    public void insertTab(@NotNull final Component c, final String title, final Alignment a, final int index) {
+        insertTab(c, title, null, a, index);
+    }
+
+    /**
+     * Insert a tab.
+     * A default tab component and popup component will be created.
+     *
+     * @param c     the component to add.
+     * @param title the title of the component.
+     * @param icon  the icon
+     * @param a     the alignment position to add at.{@link TabFramePosition#getAlignment()}
+     * @param index the index to insert at.{@link TabFramePosition#getIndex()}
+     */
+    public void insertTab(@NotNull final Component c, final String title, final Icon icon, final Alignment a,
+                          final int index) {
+        TabFramePopup popup = new PanelPopup(title, icon, c);
+        insertTab(popup, title, icon, a, index);
+    }
+
+    /**
+     * Insert a tab.
+     * A default tab component will be created.
+     *
+     * @param c     the popup to add.
+     * @param title the title of the component.
+     * @param a     the alignment position to add at.{@link TabFramePosition#getAlignment()}
+     * @param index the index to insert at.{@link TabFramePosition#getIndex()}
+     */
+    public void insertTab(@NotNull final TabFramePopup c, final String title, final Icon icon, final Alignment a,
+                          final int index) {
+        if (a == Alignment.CENTER) {
+            return;
+        }
+        var tabComponent = createDefaultTab(title, icon, a, index);
+        insertTabComp(tabComponent, a, index);
+        compsForAlignment(a).add(index, c);
+        c.setEnabled(false);
+        c.setTabFrame(this);
+        c.setAlignment(a);
+        c.setIndex(index);
+    }
+
+    protected TabFrameTab createDefaultTab(final String text, final Icon icon, final Alignment a, final int index) {
+        return new TabFrameTabLabel(text, icon, a, index, this);
+    }
+
+    /*
+     * Inserts a tab component at the given position.
+     */
+    private void insertTabComp(@NotNull final TabFrameTab tabComp, final Alignment a, final int index) {
+        tabComp.setOrientation(a);
+        getTabContainer(a).add(tabComp.getComponent());
+        var tabs = tabsForAlignment(a);
+        //Adjust indices for tabs.
+        var iterator = tabs.listIterator(index);
+        while (iterator.hasNext()) {
+            var tab = iterator.next();
+            tab.setIndex(tab.getIndex() + 1);
+        }
+        tabComp.setIndex(index);
+        tabComp.setOrientation(a);
+        tabs.add(index, tabComp);
+    }
+
+    /**
+     * Get a list of components at the given alignment position.
+     *
+     * @param a the alignment position.
+     * @return list of components at position.
+     */
+    public List<TabFramePopup> compsForAlignment(@NotNull final Alignment a) {
+        return popupLists[a.ordinal()];
+    }
+
+    /**
+     * Get the tab container for the given alignment position.
+     *
+     * @param a the alignment position.{@link TabFramePosition#getAlignment()}
+     * @return the tab container.
+     */
+    @Contract(pure = true)
+    public JComponent getTabContainer(@NotNull final Alignment a) {
+        switch (a) {
+            case NORTH:
+            case NORTH_EAST:
+                return getTopTabContainer();
+            case SOUTH:
+            case SOUTH_WEST:
+                return getBottomTabContainer();
+            case EAST:
+            case SOUTH_EAST:
+                return getRightTabContainer();
+            case WEST:
+            case NORTH_WEST:
+                return getLeftTabContainer();
+            case CENTER:
+                throw new IllegalArgumentException("invalid alignment: " + a);
+            default:
+                throw new IllegalArgumentException();
+        }
+    }
+
+    /**
+     * Get the container that holds the top tab components.
+     *
+     * @return the top tab container.
+     */
+    public JComponent getTopTabContainer() {
+        return topTabs;
+    }
+
+    /**
+     * Get the container that holds the bottom tab components.
+     *
+     * @return the bottom tab container.
+     */
+    public JComponent getBottomTabContainer() {
+        return bottomTabs;
+    }
+
+    /**
+     * Get the container that holds the right tab components.
+     *
+     * @return the right tab container.
+     */
+    public JComponent getRightTabContainer() {
+        return rightTabs;
+    }
+
+    /**
+     * Get the container that holds the left tab components.
+     *
+     * @return the left tab container.
+     */
+    public JComponent getLeftTabContainer() {
+        return leftTabs;
+    }
+
+    /**
+     * Sets the popup at the given position.
+     *
+     * @param c     the popup to place at the position.
+     * @param title the title of the popup.
+     * @param icon  the icon of the popup.
+     * @param a     the alignment position to place at.{@link TabFramePosition#getAlignment()}
+     * @param index the index to place at.{@link TabFramePosition#getIndex()}
+     */
+    public void setTabAt(final TabFramePopup c, final String title, final Icon icon,
+                         final Alignment a, final int index) {
+        if (a == Alignment.CENTER) {
+            return;
+        }
+        var text = title == null ? c.getComponent().getName() : title;
+        text = text == null ? c.getTitle() : text;
+        var tabComponent = createDefaultTab(text, icon, a, index);
+        c.setTitle(text);
+        c.setIcon(icon);
+        c.setTabFrame(this);
+        c.setAlignment(a);
+        c.setIndex(index);
+
+        tabComponent.setSelected(getTabComponentAt(a, index).isSelected());
+        setTabComponent(tabComponent, a, index);
+        compsForAlignment(a).set(index, c);
+        if (tabComponent.isSelected()) {
+            getComponentAt(a, index).doLayout();
+            getComponentAt(a, index).repaint();
+        }
+    }
+
+    /**
+     * Get the tab component at the given position.
+     *
+     * @param a     the alignment position.{@link TabFramePosition#getAlignment()}
+     * @param index the index.{@link TabFramePosition#getIndex()}
+     * @return the tab component.
+     */
+    public TabFrameTab getTabComponentAt(final Alignment a, final int index) {
+        var tabs = tabsForAlignment(a);
+        return tabs.get(index);
+    }
+
+    /*
+     * Set the tab component at the given position.
+     */
+    private void setTabComponent(@NotNull final TabFrameTab tab, final Alignment a, final int index) {
+        var tabs = tabsForAlignment(a);
+        var oldComp = tabs.get(index);
+        getTabContainer(a).remove(oldComp.getComponent());
+        getTabContainer(a).add(tab.getComponent());
+        tabs.set(index, tab);
+    }
+
+    /**
+     * Get the component at the given position.
+     *
+     * @param a     the alignment position.{@link TabFramePosition#getAlignment()}
+     * @param index the index. {@link TabFramePosition#getIndex()} ()}
+     * @return the popup component specified by {@link TabFramePopup#getContentPane()}.
+     */
+    public Component getComponentAt(final Alignment a, final int index) {
+        var tabs = compsForAlignment(a);
+        return tabs.get(index).getContentPane();
+    }
+
+    /**
+     * Close a popup.
+     *
+     * @param c the component to close.
+     */
+    public void closeTab(final Component c) {
+        var res = findComponent(c);
+        if (res != null) {
+            closeTab(res.getAlignment(), res.getIndex());
+        }
+    }
+
+    /**
+     * Gets the position of the given component or null if it isn't currently
+     * added.
+     *
+     * @param c the component to find.
+     * @return the position in the tabFrame.{@link TabFramePosition}
+     */
+    public TabFramePosition findComponent(final Component c) {
+        for (var a : Alignment.values()) {
+            var list = popupLists[a.ordinal()];
+            for (int i = 0; i < list.size(); i++) {
+                if (Objects.equals(list.get(i).getContentPane(), c)) {
+                    return new TabFramePosition(a, i);
+                }
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Close a popup.
+     *
+     * @param a     the alignment position of the popup.{@link TabFramePosition#getAlignment()}
+     * @param index the index of the tab.{@link TabFramePosition#getIndex()}
+     */
+    public void closeTab(final Alignment a, final int index) {
+        toggleTab(a, index, false);
+    }
+
+    /**
+     * Toggles the visibility of a tab.
+     *
+     * @param a       the alignment position.{@link TabFramePosition#getAlignment()}
+     * @param index   the index.{@link TabFramePosition#getIndex()}
+     * @param enabled true if visible.
+     */
+    public void toggleTab(@NotNull final Alignment a, final int index, final boolean enabled) {
+        var oldIndex = selectedIndices[a.getIndex()];
+        if (content.isEnabled(a) == enabled && oldIndex == index) return;
+        var compAtIndex = getTabComponentAt(a, index);
+        compAtIndex.setSelected(enabled);
+        notifySelectionChange(compAtIndex);
+        setPopupVisibility(compAtIndex, enabled);
+        if (enabled) {
+            getPopupComponentAt(a).doLayout();
+            getPopupComponentAt(a).requestFocus();
+        }
+        firePropertyChange("visibleTab", new TabFramePosition(a, oldIndex), new TabFramePosition(a, index));
+    }
+
+    /**
+     * Notify the tabFrame that a selection has changed.
+     *
+     * @param tabComponent the tab at which the selection has changed.
+     */
+    public void notifySelectionChange(final TabFrameTab tabComponent) {
+        if (tabComponent == null) {
+            return;
+        }
+        var a = tabComponent.getOrientation();
+        selectedIndices[a.ordinal()] = tabComponent.getIndex();
+        if (tabComponent.isSelected()) {
+            for (var tc : tabsForAlignment(a)) {
+                if (tc != null && tc != tabComponent) {
+                    tc.setSelected(false);
+                }
+            }
+        }
+    }
+
+    /*
+     * Set the visibility of the popup.
+     */
+    private void setPopupVisibility(@NotNull final TabFrameTab tabComponent,
+                                    final boolean selected) {
+        var a = tabComponent.getOrientation();
+        var c = compsForAlignment(a).get(tabComponent.getIndex());
+        c.setEnabled(selected);
+        content.setComponentAt(a, c.getComponent());
+        content.setEnabled(a, selected);
+        doLayout();
+    }
+
+    /**
+     * Get the popup component at the given position that is currently active.
+     *
+     * @param a the alignment position. {@link TabFramePosition#getAlignment()}
+     * @return the popup component specified by {@link TabFramePopup#getComponent()}.
+     */
+    public Component getPopupComponentAt(final Alignment a) {
+        var tabs = compsForAlignment(a);
+        return tabs.get(Math.max(Math.min(tabs.size() - 1, selectedIndices[a.ordinal()]), 0)).getComponent();
+    }
+
+    /**
+     * Close a popup.
+     *
+     * @param c the popup to close.
+     */
+    public void closeTab(final TabFramePopup c) {
+        if (c == null) return;
+        closeTab(c.getAlignment(), c.getIndex());
+    }
+
+    /**
+     * Open a popup.
+     *
+     * @param c the component to open.
+     */
+    public void openTab(final Component c) {
+        var res = findComponent(c);
+        if (res != null) {
+            openTab(res.getAlignment(), res.getIndex());
+        }
+    }
+
+    /**
+     * Open a popup.
+     *
+     * @param a     the alignment position of the popup.{@link TabFramePosition#getAlignment()}
+     * @param index the index of the tab.{@link TabFramePosition#getIndex()}
+     */
+    public void openTab(final Alignment a, final int index) {
+        toggleTab(a, index, true);
+    }
+
+    /**
+     * Open a popup.
+     *
+     * @param c the popup to open.
+     */
+    public void openTab(final TabFramePopup c) {
+        if (c == null) return;
+        openTab(c.getAlignment(), c.getIndex());
+    }
+
+    /**
+     * Add a popup.
+     *
+     * @param c     the content component.
+     * @param title the title.
+     * @param a     the alignment position.{@link TabFramePosition#getAlignment()}
+     */
+    public void addTab(final Component c, final String title, final Alignment a) {
+        addTab(c, title, null, a);
+    }
+
+    /**
+     * Add a popup.
+     *
+     * @param c     the content component.
+     * @param title the title.
+     * @param icon  the icon.
+     * @param a     the alignment position.{@link TabFramePosition#getAlignment()}
+     */
+    public void addTab(final Component c, final String title, final Icon icon, final Alignment a) {
+        insertTab(c, title, icon, a, tabsForAlignment(a).size());
+    }
+
+    /**
+     * Add a popup.
+     *
+     * @param c     the popup.
+     * @param title the title.
+     * @param icon  the icon.
+     * @param a     the alignment position.{@link TabFramePosition#getAlignment()}
+     */
+    public void addTab(final TabFramePopup c, final String title, final Icon icon, final Alignment a) {
+        insertTab(c, title, icon, a, tabsForAlignment(a).size());
+    }
+
+    /**
+     * Remove a popup.
+     *
+     * @param a     the alignment position.{@link TabFramePosition#getAlignment()}
+     * @param index the index of the tab.{@link TabFramePosition#getIndex()}
+     */
+    public void removeTab(final Alignment a, final int index) {
+        var comp = compsForAlignment(a).get(index);
+        comp.close();
+        comp.setTabFrame(null);
+        comp.setIndex(-1);
+        removeTabComp(a, index);
+        doLayout();
+        getTabContainer(a).repaint();
+    }
+
+    /**
+     * Move a tab to a new position.
+     *
+     * @param tabComp the tab to move.
+     * @param a       the new alignment position.{@link TabFramePosition#getAlignment()}
+     */
+    public void moveTab(@NotNull final TabFrameTab tabComp, final Alignment a) {
+        if (a == tabComp.getOrientation()) {
+            return;
+        }
+        boolean oldSelected = tabComp.isSelected();
+        var oldAlign = tabComp.getOrientation();
+        int index = tabComp.getIndex();
+        compsForAlignment(oldAlign).get(index).close();
+        removeTabComp(oldAlign, index);
+
+        var comp = compsForAlignment(oldAlign).remove(index);
+        int newIndex = tabsForAlignment(a).size();
+
+        insertTabComp(tabComp, a, newIndex);
+        compsForAlignment(a).add(newIndex, comp);
+        tabComp.setSelected(oldSelected);
+        notifySelectionChange(tabComp);
+
+        comp.setIndex(newIndex);
+        comp.setAlignment(a);
+
+        doLayout();
+        getTabContainer(oldAlign).repaint();
+        getTabContainer(a).repaint();
+    }
+
+    /*
+     * Remove a tab component from the given position.
+     */
+    private void removeTabComp(final Alignment a, final int index) {
+        var tabs = tabsForAlignment(a);
+        //Adjust indices for tabs.
+        var iterator = tabs.listIterator(index);
+        while (iterator.hasNext()) {
+            var tab = iterator.next();
+            tab.setIndex(tab.getIndex() - 1);
+        }
+        var tab = tabs.remove(index);
+        getTabContainer(a).remove(tab.getComponent());
+    }
+
+    /**
+     * Get the popup component at the given position.
+     *
+     * @param a     the alignment position.{@link TabFramePosition#getAlignment()}
+     * @param index the index.{@link TabFramePosition#getIndex()}
+     * @return the popup component specified by {@link TabFramePopup#getComponent()}.
+     */
+    public Component getPopupComponentAt(final Alignment a, final int index) {
+        var tabs = compsForAlignment(a);
+        return tabs.get(index).getComponent();
+    }
+
+    /**
+     * Get the component at the given position.
+     *
+     * @param a the alignment position. {@link TabFramePosition#getAlignment()}
+     * @return the component specified by {@link TabFramePopup#getContentPane()}.
+     */
+    public Component getComponentAt(final Alignment a) {
+        var tabs = compsForAlignment(a);
+        return tabs.get(Math.max(Math.min(tabs.size() - 1, selectedIndices[a.ordinal()]), 0)).getContentPane();
+    }
+
+    /**
+     * Get the custom tab component at the given position.
+     *
+     * @param a     the alignment position.{@link TabFramePosition#getAlignment()}
+     * @param index the index.{@link TabFramePosition#getIndex()}
+     * @return the user tab component or null if none is installed.
+     */
+    public Component getUserTabComponentAt(final Alignment a, final int index) {
+        var tab = getTabComponentAt(a, index);
+        if (tab instanceof TabFrameTabContainer) {
+            return ((TabFrameTabContainer) tab).getContent();
+        } else {
+            return null;
+        }
+    }
+
+    /**
+     * Set the custom tab component at the given position.
+     *
+     * @param component the custom tab component.
+     * @param a         the alignment position.{@link TabFramePosition#getAlignment()}
+     * @param index     the index.{@link TabFramePosition#getIndex()}
+     */
+    public void setUserTabComponentAt(final JComponent component, final Alignment a, final int index) {
+        var tabs = tabsForAlignment(a);
+        var tabContainer = tabs.get(index);
+        if (component == null) {
+            if (tabContainer instanceof TabFrameTabContainer) {
+                setTabComponent(((TabFrameTabContainer) tabContainer).oldTab, a, index);
+            }
+        } else {
+            if (tabContainer instanceof TabFrameTabContainer) {
+                ((TabFrameTabContainer) tabContainer).setContent(component);
+            } else {
+                var cont = new TabFrameTabContainer(this, component, tabContainer, a, index);
+                setTabComponent(cont, a, index);
+            }
+        }
+    }
+
+    /**
+     * Set the accelerator index at the given position.
+     *
+     * @param accelerator the accelerator. (a negative value being no accelerator).
+     * @param a           the alignment position.{@link TabFramePosition#getAlignment()}
+     * @param index       the index.{@link TabFramePosition#getIndex()}
+     */
+    public void setAcceleratorAt(final int accelerator, final Alignment a, final int index) {
+        getTabComponentAt(a, index).setAccelerator(accelerator);
+    }
+
+    /**
+     * Get the position of the alignment peer. That being the
+     * other position that occupies the same tab container given by
+     * {@link #getTabContainer(Alignment)}.
+     * <p>
+     * NORTH  <--> NORTH_EAST
+     * <p>
+     * EAST   <--> SOUTH_EAST
+     * <p>
+     * SOUTH  <--> SOUTH_WEST
+     * <p>
+     * WEST   <--> NORTH_WEST
+     *
+     * @param a the alignment position.{@link TabFramePosition#getAlignment()}
+     * @return the peer position.{@link TabFramePosition#getAlignment()}
+     */
+    public Alignment getPeer(@NotNull final Alignment a) {
+        switch (a) {
+            case NORTH:
+            case SOUTH:
+            case WEST:
+            case EAST:
+                return a.clockwise();
+            case NORTH_EAST:
+            case NORTH_WEST:
+            case SOUTH_EAST:
+            case SOUTH_WEST:
+                return a.anticlockwise();
+        }
+        return a;
+    }
+
+    /**
+     * This class represents a position inside the tabFrame.
+     */
+    public static class TabFramePosition {
+        private final Alignment a;
+        private final int index;
+
+        @Contract(pure = true)
+        public TabFramePosition(final Alignment a, final int index) {
+            this.a = a;
+            this.index = index;
+        }
+
+        /**
+         * The alignment position.
+         * This specifies at what location the tab is placed.
+         *
+         * @return the alignment position.
+         */
+        public Alignment getAlignment() {
+            return a;
+        }
+
+        /**
+         * The index inside the alignment position.
+         *
+         * @return the index.
+         */
+        public int getIndex() {
+            return index;
+        }
+    }
+}

src/main/java/com/weis/darklaf/components/tabframe/TabFrameContent.java

@@ -0,0 +1,83 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components.tabframe;
+
+import com.weis.darklaf.components.alignment.Alignment;
+
+import java.awt.*;
+
+public interface TabFrameContent {
+
+    /**
+     * Get the current component displayed in the middle.
+     *
+     * @return the content component.
+     */
+    Component getContent();
+
+    /**
+     * Sets the content to displayed in the middle.
+     *
+     * @param content the content component.
+     */
+    void setContent(final Component content);
+
+    /**
+     * Enables a popup if possible.
+     *
+     * @param a       the alignment.
+     * @param enabled true if enabled.
+     */
+    void setEnabled(Alignment a, boolean enabled);
+
+    /**
+     * Returns whether the given popup is enabled.
+     *
+     * @param a the alignment of the popup.
+     * @return true if enabled.
+     */
+    boolean isEnabled(Alignment a);
+
+    /**
+     * Sets the component at the specified position.
+     *
+     * @param a         the alignment.
+     * @param component the component.
+     */
+    void setComponentAt(final Alignment a, final Component component);
+
+    /**
+     * Get the component that displays the content.
+     *
+     * @return the display component.
+     */
+    Component getComponent();
+
+    /**
+     * Returns an array with the enabled status of each alignment.
+     *
+     * @return the enabled status.
+     */
+    boolean[] getStatus();
+}

src/main/java/com/weis/darklaf/components/tabframe/TabFrameContentPane.java

@@ -0,0 +1,449 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components.tabframe;
+
+import com.weis.darklaf.components.alignment.Alignment;
+import com.weis.darklaf.decorators.AncestorAdapter;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+
+import javax.swing.*;
+import javax.swing.event.AncestorEvent;
+import java.awt.*;
+import java.util.function.BiConsumer;
+
+/**
+ * Content pane for {@link TabFrame}.
+ *
+ * @author Jannis Weis
+ */
+public class TabFrameContentPane extends JPanel implements TabFrameContent {
+    private static final double HORIZONTAL_PROP_LEFT = 0.2;
+    private static final double VERTICAL_PROP_TOP = 0.2;
+    private static final double VERTICAL_PROP_BOTTOM = 0.75;
+    private static final double HORIZONTAL_PROP_RIGHT = 0.75;
+
+    private final ToggleSplitPane topSplit;
+    private final ToggleSplitPane bottomSplit;
+    private final ToggleSplitPane leftSplit;
+    private final ToggleSplitPane rightSplit;
+    private final ToggleSplitPane leftSplitter;
+    private final ToggleSplitPane rightSplitter;
+    private final ToggleSplitPane topSplitter;
+    private final ToggleSplitPane bottomSplitter;
+
+    private final boolean[] enabled = new boolean[8];
+
+    private Component cont = new JPanel();
+
+    public TabFrameContentPane() {
+        super(new BorderLayout());
+        cont.setBackground(Color.YELLOW);
+
+        PopupContainer leftBottomPanel = new PopupContainer();
+        PopupContainer rightTopPanel = new PopupContainer();
+        PopupContainer rightBottomPanel = new PopupContainer();
+        PopupContainer topLeftPanel = new PopupContainer();
+        PopupContainer topRightPanel = new PopupContainer();
+        PopupContainer bottomLeftPanel = new PopupContainer();
+        PopupContainer bottomRightPanel = new PopupContainer();
+        PopupContainer leftTopPanel = new PopupContainer();
+
+        rightSplitter = new ToggleSplitPane("rightSplitter");
+        rightSplitter.setOrientation(JSplitPane.VERTICAL_SPLIT);
+        rightSplitter.setTopComponent(rightTopPanel);
+        rightSplitter.setBottomComponent(rightBottomPanel);
+
+        leftSplitter = new ToggleSplitPane("leftSplitter");
+        leftSplitter.setOrientation(JSplitPane.VERTICAL_SPLIT);
+        leftSplitter.setTopComponent(leftTopPanel);
+        leftSplitter.setBottomComponent(leftBottomPanel);
+
+        topSplitter = new ToggleSplitPane("topSplitter");
+        topSplitter.setOrientation(JSplitPane.HORIZONTAL_SPLIT);
+        topSplitter.setLeftComponent(topLeftPanel);
+        topSplitter.setRightComponent(topRightPanel);
+
+        bottomSplitter = new ToggleSplitPane("bottomSplitter");
+        bottomSplitter.setOrientation(JSplitPane.HORIZONTAL_SPLIT);
+        bottomSplitter.setLeftComponent(bottomLeftPanel);
+        bottomSplitter.setRightComponent(bottomRightPanel);
+
+
+        topSplit = new ToggleSplitPane("topSplit");
+        bottomSplit = new ToggleSplitPane("bottomSplit");
+        topSplit.setOrientation(JSplitPane.VERTICAL_SPLIT);
+        bottomSplit.setOrientation(JSplitPane.VERTICAL_SPLIT);
+
+        topSplit.setTopComponent(topSplitter);
+        topSplit.setBottomComponent(bottomSplit);
+        bottomSplit.setBottomComponent(bottomSplitter);
+
+        leftSplit = new ToggleSplitPane("leftSplit");
+        rightSplit = new ToggleSplitPane("rightSplit");
+        leftSplit.setOrientation(JSplitPane.HORIZONTAL_SPLIT);
+        rightSplit.setOrientation(JSplitPane.HORIZONTAL_SPLIT);
+
+        bottomSplit.setTopComponent(leftSplit);
+        leftSplit.setLeftComponent(leftSplitter);
+        leftSplit.setRightComponent(rightSplit);
+        rightSplit.setRightComponent(rightSplitter);
+        rightSplit.setLeftComponent(cont);
+
+        topSplit.setResizeWeight(0.0d);
+        leftSplit.setResizeWeight(0.0d);
+        bottomSplit.setResizeWeight(1.0d);
+        rightSplit.setResizeWeight(1.0d);
+        setupSplitterPanes(JSplitPane::setResizeWeight, 0.5d);
+
+        setupSplitPanes(JSplitPane::setEnabled, false);
+        setupSplitPanes(ToggleSplitPane::setResizable, false);
+        setupSplitterPanes(JSplitPane::setEnabled, false);
+        setupSplitterPanes(ToggleSplitPane::setResizable, false);
+
+        add(topSplit, BorderLayout.CENTER);
+
+        addAncestorListener(new AncestorAdapter() {
+            @Override
+            public void ancestorAdded(final AncestorEvent event) {
+                removeAncestorListener(this);
+                SwingUtilities.invokeLater(() -> init());
+            }
+        });
+    }
+
+    private <T> void setupSplitterPanes(@NotNull final BiConsumer<? super ToggleSplitPane, T> consumer,
+                                        final T flag) {
+        consumer.accept(bottomSplitter, flag);
+        consumer.accept(leftSplitter, flag);
+        consumer.accept(rightSplitter, flag);
+        consumer.accept(topSplitter, flag);
+    }
+
+    private <T> void setupSplitPanes(@NotNull final BiConsumer<? super ToggleSplitPane, T> consumer,
+                                     final T flag) {
+        consumer.accept(topSplit, flag);
+        consumer.accept(leftSplit, flag);
+        consumer.accept(bottomSplit, flag);
+        consumer.accept(rightSplit, flag);
+    }
+
+    private void init() {
+        disableAll(true);
+        topSplit.savePosition(VERTICAL_PROP_TOP);
+        bottomSplit.savePosition(VERTICAL_PROP_BOTTOM);
+        leftSplit.savePosition(HORIZONTAL_PROP_LEFT);
+        rightSplit.savePosition(HORIZONTAL_PROP_RIGHT);
+        setupSplitterPanes(ToggleSplitPane::savePosition, 0.5d);
+        doLayout();
+    }
+
+    public void disableAll(final boolean force) {
+        for (var a : Alignment.values()) {
+            setEnabled(a, false, force);
+        }
+    }
+
+    /**
+     * Show or hide the corresponding panel.
+     *
+     * @param a       position of panel.
+     * @param enabled true if should be shown.
+     * @param force   whether to force the layout process.
+     */
+    public void setEnabled(@NotNull final Alignment a, final boolean enabled, final boolean force) {
+        if (enabled == isEnabled(a) && !force) return;
+        switch (a) {
+            case NORTH:
+                changeStatus(
+                        enabled, Alignment.NORTH_EAST,
+                        topSplit, topSplitter,
+                        new LayoutProportions(VERTICAL_PROP_TOP, 1.0, 0.0, 0.0),
+                        new LayoutWeights(0.0, 0.0, 0.0, 1.0));
+                break;
+            case NORTH_EAST:
+                changeStatus(
+                        enabled, Alignment.NORTH,
+                        topSplit, topSplitter,
+                        new LayoutProportions(VERTICAL_PROP_TOP, 0.0, 0.0, 1.0),
+                        new LayoutWeights(0.0, 0.0, 1.0, 0.0));
+                break;
+            case EAST:
+                changeStatus(
+                        enabled, Alignment.SOUTH_EAST,
+                        rightSplit, rightSplitter,
+                        new LayoutProportions(HORIZONTAL_PROP_RIGHT, 1.0, 1.0, 0.0),
+                        new LayoutWeights(1.0, 1.0, 0.0, 1.0));
+                break;
+            case SOUTH_EAST:
+                changeStatus(
+                        enabled, Alignment.EAST,
+                        rightSplit, rightSplitter,
+                        new LayoutProportions(HORIZONTAL_PROP_RIGHT, 0.0, 1.0, 1.0),
+                        new LayoutWeights(1.0, 1.0, 1.0, 0.0));
+                break;
+            case NORTH_WEST:
+                changeStatus(
+                        enabled, Alignment.WEST,
+                        leftSplit, leftSplitter,
+                        new LayoutProportions(VERTICAL_PROP_TOP, 1.0, 0.0, 0.0),
+                        new LayoutWeights(0.0, 0.0, 0.0, 1.0));
+                break;
+            case WEST:
+                changeStatus(
+                        enabled, Alignment.NORTH_WEST,
+                        leftSplit, leftSplitter,
+                        new LayoutProportions(VERTICAL_PROP_TOP, 0.0, 0.0, 1.0),
+                        new LayoutWeights(0.0, 0.0, 1.0, 0.0));
+                break;
+            case SOUTH_WEST:
+                changeStatus(
+                        enabled, Alignment.SOUTH,
+                        bottomSplit, bottomSplitter,
+                        new LayoutProportions(VERTICAL_PROP_BOTTOM, 1.0, 1.0, 0.0),
+                        new LayoutWeights(1.0, 1.0, 0.0, 1.0));
+                break;
+            case SOUTH:
+                changeStatus(
+                        enabled, Alignment.SOUTH_WEST,
+                        bottomSplit, bottomSplitter,
+                        new LayoutProportions(VERTICAL_PROP_BOTTOM, 0.0, 1.0, 1.0),
+                        new LayoutWeights(1.0, 1.0, 1.0, 0.0));
+                break;
+            case CENTER:
+                break;
+        }
+        setEnabledFlag(a, enabled);
+    }
+
+    /**
+     * Change status of panel.
+     *
+     * @param enabled     new status.
+     * @param peer        peer alignment.
+     * @param split       the split panel.
+     * @param splitter    the splitter panel.
+     * @param proportions the layout proportions
+     * @param weights     the layout weights
+     */
+    private void changeStatus(final boolean enabled, @NotNull final Alignment peer,
+                              @NotNull final ToggleSplitPane split,
+                              @NotNull final ToggleSplitPane splitter,
+                              @NotNull final LayoutProportions proportions,
+                              @NotNull final LayoutWeights weights) {
+        if (enabled) {
+            enable(split, weights.splitEnable);
+            if (!isEnabled(peer)) {
+                disable(splitter, weights.splitterPeerDisable, proportions.splitterPeerDisable);
+            } else {
+                enable(splitter, 0.5d);
+            }
+        } else {
+            if (!isEnabled(peer)) {
+                disable(split, weights.splitDisable, proportions.splitDisable);
+            }
+            disable(splitter, weights.splitterDisable, proportions.splitterDisable);
+        }
+    }
+
+    /*
+     * Update the flags.
+     */
+    private void setEnabledFlag(@NotNull final Alignment a, final boolean e) {
+        if (a != Alignment.CENTER) {
+            enabled[a.getIndex()] = e;
+        }
+    }
+
+    private void enable(@NotNull final ToggleSplitPane splitPane, final double weight) {
+        boolean restore = !splitPane.isResizable();
+        splitPane.setEnabled(true);
+        splitPane.setResizable(true);
+        splitPane.setResizeWeight(weight);
+        if (restore) {
+            splitPane.restorePosition();
+        }
+    }
+
+    private void disable(@NotNull final ToggleSplitPane splitPane, final double weight, final double location) {
+        if (splitPane.isResizable()) {
+            splitPane.savePosition();
+        }
+        splitPane.setResizeWeight(weight);
+        splitPane.forceSetDividerLocation(location);
+        splitPane.setEnabled(false);
+        splitPane.setResizable(false);
+    }
+
+    public Component getContent() {
+        return cont;
+    }
+
+    public void setContent(final Component pane) {
+        cont = pane;
+        rightSplit.setLeftComponent(pane);
+    }
+
+    /**
+     * Show or hide the corresponding panel.
+     *
+     * @param a       position of panel.
+     * @param enabled true if should be shown.
+     */
+    public void setEnabled(@NotNull final Alignment a, final boolean enabled) {
+        setEnabled(a, enabled, false);
+    }
+
+    /**
+     * Returns whether the corresponding panel is currently enabled/visible.
+     *
+     * @param a the position of the panel.
+     * @return true if enabled.
+     */
+    public boolean isEnabled(@NotNull final Alignment a) {
+        if (a == Alignment.CENTER) {
+            return false;
+        } else {
+            return enabled[a.getIndex()];
+        }
+    }
+
+    public void setComponentAt(@NotNull final Alignment a, final Component c) {
+        switch (a) {
+            case NORTH:
+                ((PopupContainer) topSplitter.getLeftComponent()).setPopup(c);
+                break;
+            case NORTH_EAST:
+                ((PopupContainer) topSplitter.getRightComponent()).setPopup(c);
+                break;
+            case EAST:
+                ((PopupContainer) rightSplitter.getTopComponent()).setPopup(c);
+                break;
+            case SOUTH_EAST:
+                ((PopupContainer) rightSplitter.getBottomComponent()).setPopup(c);
+                break;
+            case SOUTH:
+                ((PopupContainer) bottomSplitter.getRightComponent()).setPopup(c);
+                break;
+            case SOUTH_WEST:
+                ((PopupContainer) bottomSplitter.getLeftComponent()).setPopup(c);
+                break;
+            case WEST:
+                ((PopupContainer) leftSplitter.getBottomComponent()).setPopup(c);
+                break;
+            case NORTH_WEST:
+                ((PopupContainer) leftSplitter.getTopComponent()).setPopup(c);
+                break;
+            case CENTER:
+                break;
+        }
+    }
+
+    @Override
+    public Component getComponent() {
+        return this;
+    }
+
+    /**
+     * Get the status of the individual panels.
+     *
+     * @return array of status of panels.
+     */
+    @NotNull
+    public boolean[] getStatus() {
+        return enabled;
+    }
+
+    /**
+     * Get the popup component at the position.
+     *
+     * @param a the position.
+     * @return the popup component at position.
+     */
+    @NotNull
+    public PanelPopup getPopupComponent(@NotNull final Alignment a) {
+        Component popupComponent;
+        switch (a) {
+            case NORTH:
+                popupComponent = ((PopupContainer) topSplitter.getLeftComponent()).getPopup();
+                break;
+            case NORTH_EAST:
+                popupComponent = ((PopupContainer) topSplitter.getRightComponent()).getPopup();
+                break;
+            case EAST:
+                popupComponent = ((PopupContainer) rightSplitter.getTopComponent()).getPopup();
+                break;
+            case SOUTH_EAST:
+                popupComponent = ((PopupContainer) rightSplitter.getBottomComponent()).getPopup();
+                break;
+            case SOUTH:
+                popupComponent = ((PopupContainer) bottomSplitter.getRightComponent()).getPopup();
+                break;
+            case SOUTH_WEST:
+                popupComponent = ((PopupContainer) bottomSplitter.getLeftComponent()).getPopup();
+                break;
+            case WEST:
+                popupComponent = ((PopupContainer) leftSplitter.getBottomComponent()).getPopup();
+                break;
+            case NORTH_WEST:
+                popupComponent = ((PopupContainer) leftSplitter.getTopComponent()).getPopup();
+                break;
+            default:
+                throw new IllegalArgumentException("CENTER is not supported");
+        }
+        return (PanelPopup) popupComponent;
+    }
+
+    protected static class LayoutProportions {
+        protected final double splitRestore;
+        protected final double splitterPeerDisable;
+        protected final double splitDisable;
+        protected final double splitterDisable;
+
+        @Contract(pure = true)
+        public LayoutProportions(final double splitRestore, final double splitterPeerDisable,
+                                 final double splitDisable, final double splitterDisable) {
+            this.splitRestore = splitRestore;
+            this.splitterPeerDisable = splitterPeerDisable;
+            this.splitDisable = splitDisable;
+            this.splitterDisable = splitterDisable;
+        }
+    }
+
+    protected static class LayoutWeights {
+        protected final double splitEnable;
+        protected final double splitterDisable;
+        protected final double splitDisable;
+        protected final double splitterPeerDisable;
+
+        @Contract(pure = true)
+        public LayoutWeights(final double splitEnable, final double splitterDisable,
+                             final double splitDisable, final double splitterPeerDisable) {
+            this.splitEnable = splitEnable;
+            this.splitterDisable = splitterDisable;
+            this.splitDisable = splitDisable;
+            this.splitterPeerDisable = splitterPeerDisable;
+        }
+    }
+}

src/main/java/com/weis/darklaf/components/tabframe/TabFramePopup.java

@@ -0,0 +1,158 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components.tabframe;
+
+import com.weis.darklaf.components.alignment.Alignment;
+
+import javax.swing.*;
+import java.awt.*;
+
+public interface TabFramePopup {
+
+    /**
+     * Get the current content pane. A popup may hold more
+     * than one content pane. In this case this method should return
+     * the component that is currently displayed.
+     *
+     * @return the current content pane.
+     */
+    Component getContentPane();
+
+    /**
+     * Sets the content pane. This needn't replace the old
+     * content pane if this popup supports multiple content panes.
+     */
+    void setContentPane(Component contentPane);
+
+    /**
+     * Get the component that realizes this popup.
+     *
+     * @return the component.
+     */
+    Component getComponent();
+
+    /**
+     * Close the popup.
+     */
+    default void close() {
+        if (getTabFrame() != null && getAlignment() != null && getIndex() >= 0) {
+            getTabFrame().closeTab(getAlignment(), getIndex());
+        }
+    }
+
+    /**
+     * Get the {{@link TabFrame}} this popup belongs to.
+     *
+     * @return the {{@link TabFrame}}.
+     */
+    TabFrame getTabFrame();
+
+    /**
+     * Sets the {{@link TabFrame}} this popup belongs to.
+     *
+     * @param tabFrame the {{@link TabFrame}}.
+     */
+    void setTabFrame(TabFrame tabFrame);
+
+    /**
+     * Gets the alignment position in the {{@link TabFrame}}.
+     *
+     * @return the alignment position.
+     */
+    Alignment getAlignment();
+
+    /**
+     * Get the index of the popup.
+     *
+     * @return the index.
+     */
+    int getIndex();
+
+    /**
+     * Set the index of the popup.
+     * This method should only be called from {{@link TabFrame}}.
+     *
+     * @param index the index.
+     */
+    void setIndex(int index);
+
+    /**
+     * Sets the alignment position in the {{@link TabFrame}}.
+     * This method should only be called from {{@link TabFrame}}.
+     *
+     * @param alignment the alignment position.
+     */
+    void setAlignment(Alignment alignment);
+
+    /**
+     * Open the popup.
+     */
+    default void open() {
+        if (getTabFrame() != null && getAlignment() != null && getIndex() >= 0) {
+            getTabFrame().closeTab(getAlignment(), getIndex());
+        }
+    }
+
+    /**
+     * Returns whether this popup is enabled.
+     *
+     * @return true if enabled.
+     */
+    boolean isEnabled();
+
+    /**
+     * Sets the enabled status of the popup.
+     *
+     * @param enabled true if enabled.
+     */
+    void setEnabled(boolean enabled);
+
+    /**
+     * Get the title of the popup.
+     *
+     * @return the title.
+     */
+    String getTitle();
+
+    /**
+     * Set the title of the popup.
+     *
+     * @param title the title.
+     */
+    void setTitle(String title);
+
+    /**
+     * Get the icon of the popup.
+     *
+     * @return the icon.
+     */
+    Icon getIcon();
+
+    /**
+     * Set the icon of the popup.
+     *
+     * @param icon the icon.
+     */
+    void setIcon(Icon icon);
+}

src/main/java/com/weis/darklaf/components/tabframe/TabFrameTab.java

@@ -0,0 +1,108 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components.tabframe;
+
+import com.weis.darklaf.components.alignment.Alignment;
+
+import java.awt.*;
+
+public interface TabFrameTab {
+
+    /**
+     * Get the index of the tab.
+     *
+     * @return the current index.
+     */
+    int getIndex();
+
+    /**
+     * Sets the index of the tab.
+     *
+     * @param index the index.
+     */
+    void setIndex(int index);
+
+    /**
+     * Get the component housing the tab.
+     *
+     * @return the display component.
+     */
+    Component getComponent();
+
+    /**
+     * Get the orientation.
+     *
+     * @return the orientation.
+     */
+    Alignment getOrientation();
+
+    /**
+     * Sets the orientation.
+     *
+     * @param a the orientation.
+     */
+    void setOrientation(Alignment a);
+
+    /**
+     * Returns whether the tab is selected.
+     *
+     * @return true if selected.
+     */
+    boolean isSelected();
+
+    /**
+     * Set the selected status of the tab.
+     *
+     * @param selected true if selected
+     */
+    void setSelected(boolean selected);
+
+    /**
+     * Get the accelerator.
+     *
+     * @return the accelerator.
+     */
+    int getAccelerator();
+
+    /**
+     * Set the accelerator.
+     *
+     * @param accelerator accelerator (>0).
+     */
+    void setAccelerator(int accelerator);
+
+    /**
+     * Get the tab frame this tab currently belongs to.
+     *
+     * @return the TabFrame.
+     */
+    TabFrame getTabFrame();
+
+    /**
+     * Set the tab frame this tab currently belongs to.
+     *
+     * @param tabFrame the TabFrame.
+     */
+    void setTabFrame(TabFrame tabFrame);
+}

src/main/java/com/weis/darklaf/components/tabframe/TabFrameTabContainer.java

@@ -0,0 +1,153 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components.tabframe;
+
+import com.weis.darklaf.components.alignment.Alignment;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class TabFrameTabContainer extends JPanel implements TabFrameTab {
+
+    protected final TabFrameTab oldTab;
+    private TabFrame parent;
+    private Component content;
+    private Alignment orientation;
+    private boolean selected;
+    private int index;
+    private int accelerator;
+
+    public TabFrameTabContainer(final TabFrame parent, final JComponent content, final TabFrameTab oldTab,
+                                final Alignment alignment, final int index) {
+        super(new BorderLayout());
+        this.parent = parent;
+        this.oldTab = oldTab;
+        this.accelerator = -1;
+        setOpaque(false);
+        setOrientation(alignment);
+        setIndex(index);
+        setContent(content);
+    }
+
+    @Override
+    public String getUIClassID() {
+        return "TabFrameTabContainerUI";
+    }
+
+    /**
+     * Get the content component.
+     *
+     * @return the content component.
+     */
+    public Component getContent() {
+        return content;
+    }
+
+    /**
+     * Set the content to display.
+     *
+     * @param content the content component.
+     */
+    public void setContent(final JComponent content) {
+        var old = this.content;
+        remove(content);
+        this.content = content;
+        add(content, BorderLayout.CENTER);
+        firePropertyChange("content", old, content);
+    }
+
+    @Override
+    public Color getBackground() {
+        if (content != null && !content.isOpaque()) {
+            return super.getBackground();
+        }
+        return content != null ? content.getBackground() : super.getBackground();
+    }
+
+    @Override
+    public int getIndex() {
+        return index;
+    }
+
+    @Override
+    public void setIndex(final int index) {
+        this.index = index;
+    }
+
+    @Override
+    public Component getComponent() {
+        return this;
+    }
+
+    @Override
+    public Alignment getOrientation() {
+        return orientation;
+    }
+
+    @Override
+    public void setOrientation(final Alignment a) {
+        if (this.orientation == a) return;
+        var oldOrientation = this.orientation;
+        this.orientation = a;
+        firePropertyChange("orientation", oldOrientation, orientation);
+    }
+
+    @Override
+    public boolean isSelected() {
+        return selected;
+    }
+
+    @Override
+    public void setSelected(final boolean selected) {
+        if (selected == this.selected) return;
+        boolean oldSelected = this.selected;
+        this.selected = selected;
+        firePropertyChange("selected", oldSelected, selected);
+    }
+
+    @Override
+    public int getAccelerator() {
+        return accelerator;
+    }
+
+    @Override
+    public void setAccelerator(final int accelerator) {
+        if (this.accelerator == accelerator) return;
+        int oldAccelerator = this.accelerator;
+        this.accelerator = accelerator;
+        firePropertyChange("accelerator", oldAccelerator, accelerator);
+    }
+
+    @Override
+    public TabFrame getTabFrame() {
+        return parent;
+    }
+
+    @Override
+    public void setTabFrame(final TabFrame parent) {
+        var old = this.parent;
+        this.parent = parent;
+        firePropertyChange("tabFrame", old, parent);
+    }
+}

src/main/java/com/weis/darklaf/components/tabframe/TabFrameTabLabel.java

@@ -0,0 +1,167 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components.tabframe;
+
+import com.weis.darklaf.components.alignment.Alignment;
+import com.weis.darklaf.icons.EmptyIcon;
+import com.weis.darklaf.ui.tabframe.DarkTabFrameTabLabelUI;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import javax.swing.*;
+import java.awt.*;
+import java.util.Objects;
+
+/**
+ * Tab Component for {@link TabFrame}.
+ *
+ * @author Jannis Weis
+ */
+public class TabFrameTabLabel extends JLabel implements TabFrameTab {
+
+    private TabFrame parent;
+    private Alignment orientation;
+    private String title;
+    private boolean selected;
+    private int accelerator;
+    private int index;
+
+    /**
+     * Create new TabComponent for the frame of {@link TabFrame}.
+     *
+     * @param title       the title.
+     * @param icon        the icon.
+     * @param orientation the alignment.
+     * @param index       the index.
+     * @param parent      the parent layout manager.
+     */
+    public TabFrameTabLabel(final String title, final Icon icon, final Alignment orientation,
+                            final int index, @NotNull final TabFrame parent) {
+        this.index = index;
+        this.accelerator = -1;
+        this.parent = parent;
+        setOrientation(orientation);
+        setIcon(icon == null ? EmptyIcon.create(0) : icon);
+        setTitle(title);
+        setText(title);
+    }
+
+    @Override
+    public String getUIClassID() {
+        return "TabFrameTabLabelUI";
+    }
+
+    public void setUI(final DarkTabFrameTabLabelUI ui) {
+        super.setUI(ui);
+    }
+
+    @Override
+    public int getIndex() {
+        return index;
+    }
+
+    @Override
+    public void setIndex(final int index) {
+        this.index = index;
+    }
+
+    @Override
+    public Component getComponent() {
+        return this;
+    }
+
+    @Override
+    public Alignment getOrientation() {
+        return orientation;
+    }
+
+    @Override
+    public void setOrientation(final Alignment a) {
+        if (this.orientation == a) return;
+        var oldOrientation = this.orientation;
+        this.orientation = a;
+        firePropertyChange("orientation", oldOrientation, orientation);
+    }
+
+    @Override
+    public boolean isSelected() {
+        return selected;
+    }
+
+    @Override
+    public void setSelected(final boolean selected) {
+        if (selected == this.selected) return;
+        boolean oldSelected = this.selected;
+        this.selected = selected;
+        firePropertyChange("selected", oldSelected, selected);
+    }
+
+    @Override
+    public int getAccelerator() {
+        return accelerator;
+    }
+
+    @Override
+    public void setAccelerator(final int accelerator) {
+        if (this.accelerator == accelerator) return;
+        int oldAccelerator = this.accelerator;
+        this.accelerator = accelerator;
+        firePropertyChange("accelerator", oldAccelerator, accelerator);
+    }
+
+    @Override
+    public TabFrame getTabFrame() {
+        return parent;
+    }
+
+    @Override
+    public void setTabFrame(final TabFrame parent) {
+        var old = this.parent;
+        this.parent = parent;
+        firePropertyChange("tabFrame", old, parent);
+    }
+
+    /**
+     * Returns the current title.
+     * This needn't be the same as the displayed text.
+     * For this use {@link #getText()} instead.
+     *
+     * @return the current title.
+     */
+    public String getTitle() {
+        return title;
+    }
+
+    /**
+     * Set the title of the component.
+     *
+     * @param title the title
+     */
+    public void setTitle(@Nullable final String title) {
+        if (Objects.equals(title, this.title)) return;
+        String oldTitle = this.title;
+        this.title = title;
+        firePropertyChange("title", oldTitle, selected);
+    }
+}

src/main/java/com/weis/darklaf/components/tabframe/TabFrameUI.java

@@ -0,0 +1,31 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components.tabframe;
+
+import javax.swing.plaf.ComponentUI;
+
+public abstract class TabFrameUI extends ComponentUI {
+
+    public abstract int getTabSize(TabFrame tabFrame);
+}

src/main/java/com/weis/darklaf/components/tabframe/TabbedPopup.java

@@ -0,0 +1,154 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components.tabframe;
+
+import javax.swing.*;
+import java.awt.*;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+/**
+ * Tabbed Popup Component for {@link TabFrame}.
+ *
+ * @author Jannis Weis
+ */
+public class TabbedPopup extends PanelPopup {
+
+    private JTabbedPane tabbedPane;
+
+    /**
+     * Creates a Popup that can hold multiple content panes using a TabbedPane.
+     *
+     * @param title the title of the popup.
+     */
+    public TabbedPopup(final String title) {
+        this(title, null, null);
+    }
+
+    /**
+     * Creates a Popup that can hold multiple content panes using a TabbedPane.
+     *
+     * @param title   the title of the popup.
+     * @param icon    the icon of the popup.
+     * @param content the initial content pane.
+     */
+    public TabbedPopup(final String title, final Icon icon, final Component content) {
+        super(title, icon, content);
+        setIcon(icon);
+        setTitle(title);
+        setContentPane(content);
+        setEnabled(false);
+    }
+
+    /**
+     * Creates a Popup that can hold multiple content panes using a TabbedPane.
+     *
+     * @param title the title of the popup.
+     * @param icon  the icon of the popup.
+     */
+    public TabbedPopup(final String title, final Icon icon) {
+        this(title, icon, null);
+    }
+
+    /**
+     * Creates a Popup that can hold multiple content panes using a TabbedPane.
+     *
+     * @param title   the title of the popup.
+     * @param content the initial content pane.
+     */
+    public TabbedPopup(final String title, final Component content) {
+        this(title, null, content);
+    }
+
+    /**
+     * Returns all currently installed content panes.
+     * i.e. this area all components currently added as tabs to
+     * the TabbedPane.
+     * {@see {@link #getTabbedPane()}}.
+     *
+     * @return a collection of components.
+     */
+    public Collection<Component> getContentPanes() {
+        int size = getTabbedPane().getTabCount();
+        List<Component> compList = new ArrayList<>(size);
+        for (int i = 0; i < size; i++) {
+            compList.add(tabbedPane.getComponentAt(i));
+        }
+        return compList;
+    }
+
+    /**
+     * Get the tabbed pane.
+     *
+     * @return the tabbed pane.
+     */
+    public JTabbedPane getTabbedPane() {
+        if (tabbedPane == null) {
+            tabbedPane = createTabbedPane();
+        }
+        return tabbedPane;
+    }
+
+    /**
+     * Creates the tabbedPane.
+     * Overwrite this method to customize the tabbedPane used.
+     *
+     * @return a tabbed pane.
+     */
+    protected JTabbedPane createTabbedPane() {
+        return new JTabbedPane();
+    }
+
+    @Override
+    public String getUIClassID() {
+        return "TabFrameTabbedPopupUI";
+    }
+
+    /**
+     * Gets the currently selected component from the TabbedPane.
+     * {@see {@link #getTabbedPane()}}.
+     *
+     * @return the selected component.
+     */
+    public Component getContentPane() {
+        return tabbedPane.getSelectedComponent();
+    }
+
+    /**
+     * Adds the component to the tabbed pane if it isn't already added.
+     * This method exists to conform the interface methods.
+     * It is preferred to directly add to the TabbedPane obtained by
+     * {@link #getTabbedPane()}.
+     *
+     * @param component the component to add.
+     */
+    public void setContentPane(final Component component) {
+        if (component == null) return;
+        if (getContentPanes().contains(component)) {
+            return;
+        }
+        getTabbedPane().addTab(component.getName(), component);
+    }
+}

src/main/java/com/weis/darklaf/components/tabframe/ToggleSplitPane.java

@@ -0,0 +1,159 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.components.tabframe;
+
+import javax.swing.*;
+import javax.swing.plaf.basic.BasicSplitPaneUI;
+
+public class ToggleSplitPane extends JSplitPane {
+
+    private int disabledPos = 0;
+    private int disabledMax = -1;
+    private boolean resizable = true;
+    private boolean lastEnabled = true;
+    private double restorePercentage;
+
+
+    public ToggleSplitPane() {
+        this(null);
+    }
+
+    public ToggleSplitPane(final String name) {
+        setName(name);
+        putClientProperty("JSplitPane.style", "invisible");
+    }
+
+
+    public boolean isResizable() {
+        return resizable;
+    }
+
+    /**
+     * Set if the split pane should be able to resize.
+     *
+     * @param resizable true if it should resize.
+     */
+    public void setResizable(final boolean resizable) {
+        this.resizable = resizable;
+        if (!resizable) {
+            lastEnabled = isEnabled();
+            setEnabled(false);
+            disabledPos = super.getDividerLocation();
+            disabledMax = getMaximumDividerLocation();
+        } else {
+            setEnabled(lastEnabled);
+        }
+    }
+
+    @Override
+    public void setEnabled(final boolean enabled) {
+        ((BasicSplitPaneUI) getUI()).getDivider().setEnabled(enabled);
+    }
+
+    public void savePosition() {
+        savePosition(getRelativeDividerLocation());
+    }
+
+    public void savePosition(final double position) {
+        restorePercentage = Math.max(0, Math.min(1.0, position));
+    }
+
+    public double getRelativeDividerLocation() {
+        if (getOrientation() == HORIZONTAL_SPLIT) {
+            return getDividerLocation() / (double) getWidth();
+        } else {
+            return getDividerLocation() / (double) getHeight();
+        }
+    }
+
+    public void restorePosition() {
+        setDividerLocation(restorePercentage);
+        doLayout();
+    }
+
+    public void forceSetDividerLocation(final int location) {
+        super.setDividerLocation(location);
+    }
+
+    @Override
+    public int getDividerLocation() {
+        if (resizable) {
+            return super.getDividerLocation();
+        } else {
+            return disabledMax == disabledPos ? getMaximumDividerLocation() : disabledPos;
+        }
+    }
+
+    public void forceSetDividerLocation(final double proportionalLocation) {
+        if (proportionalLocation < 0.0 ||
+                proportionalLocation > 1.0) {
+            throw new IllegalArgumentException("proportional location must "
+                                                       + "be between 0.0 and 1.0.");
+        }
+        if (getOrientation() == VERTICAL_SPLIT) {
+            super.setDividerLocation((int) ((double) (getHeight()) * proportionalLocation));
+        } else {
+            super.setDividerLocation((int) ((double) (getWidth()) * proportionalLocation));
+        }
+    }
+
+    @Override
+    public int getLastDividerLocation() {
+        if (resizable) {
+            return super.getLastDividerLocation();
+        } else {
+            return disabledMax == disabledPos ? getMaximumDividerLocation() : disabledPos;
+        }
+    }
+
+    @Override
+    public void setDividerLocation(final int location) {
+        if (resizable) {
+            super.setDividerLocation(location);
+        } else if (disabledPos == disabledMax) {
+            super.setDividerLocation(getMaximumDividerLocation());
+            doLayout();
+        } else if (disabledPos == 0) {
+            super.setDividerLocation(0);
+            doLayout();
+        }
+    }
+
+
+    @Override
+    public int getMaximumDividerLocation() {
+        int max = getOrientation() == HORIZONTAL_SPLIT ? getWidth() : getHeight();
+        return Math.max(max, getMinimumDividerLocation());
+    }
+
+    @Override
+    public int getMinimumDividerLocation() {
+        var comp = getRightComponent();
+        return comp == null ? 0 : getOrientation() == HORIZONTAL_SPLIT
+                                  ? comp.getMinimumSize().width
+                                  : comp.getMinimumSize().height;
+    }
+
+
+}

src/main/java/com/weis/darklaf/decorators/HoverListener.java

@@ -0,0 +1,91 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.decorators;
+
+import org.jetbrains.annotations.Contract;
+
+import javax.swing.*;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+
+/**
+ * @author Jannis Weis
+ */
+public class HoverListener implements MouseListener {
+
+    private final JComponent component;
+    private boolean hover = false;
+    private boolean scheduled = false;
+
+    @Contract(pure = true)
+    public HoverListener(final JComponent component) {
+        this.component = component;
+    }
+
+    public boolean isHover() {
+        return hover;
+    }
+
+    @Override
+    public void mouseClicked(final MouseEvent e) {
+
+    }
+
+    @Override
+    public void mousePressed(final MouseEvent e) {
+
+    }
+
+    @Override
+    public void mouseReleased(final MouseEvent e) {
+
+    }
+
+    @Override
+    public void mouseEntered(final MouseEvent e) {
+        if (!hover) {
+            hover = true;
+            scheduleRepaint();
+        }
+    }
+
+    private void scheduleRepaint() {
+        if (!scheduled) {
+            scheduled = true;
+            SwingUtilities.invokeLater(() -> {
+                component.invalidate();
+                component.repaint();
+                scheduled = false;
+            });
+        }
+    }
+
+    @Override
+    public void mouseExited(final MouseEvent e) {
+        if (hover) {
+            hover = false;
+            scheduleRepaint();
+        }
+    }
+}

src/main/java/com/weis/darklaf/icons/RotatableIcon.java

@@ -0,0 +1,116 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.icons;
+
+import com.weis.darklaf.components.alignment.Alignment;
+import org.jetbrains.annotations.Contract;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.geom.AffineTransform;
+
+public class RotatableIcon implements Icon {
+
+    private Icon icon;
+    private Alignment alignment;
+
+    @Contract(pure = true)
+    public RotatableIcon() {
+        this(null);
+    }
+
+    @Contract(pure = true)
+    public RotatableIcon(final Icon icon) {
+        setIcon(icon);
+        this.alignment = null;
+    }
+
+    public void setIcon(final Icon icon) {
+        this.icon = icon == null ? EmptyIcon.create(0) : icon;
+    }
+
+    @Override
+    public void paintIcon(final Component c, final Graphics g, final int x, final int y) {
+        if (icon instanceof DarkSVGIcon) {
+            ((DarkSVGIcon) icon).paintIcon(c, g, x, y, getAngle());
+        } else if (icon != null) {
+            Graphics2D g2 = (Graphics2D) g.create();
+            AffineTransform transform = new AffineTransform();
+            transform.rotate(getAngle(), x + getIconWidth() / 2.0, y + getIconHeight() / 2.0);
+            g2.transform(transform);
+            icon.paintIcon(c, g2, x, y);
+        }
+    }
+
+    @Contract(pure = true)
+    private double getAngle() {
+        double angle = 0.0;
+        switch (alignment) {
+            case NORTH:
+            case CENTER:
+                angle = 0.0;
+                break;
+            case SOUTH:
+                angle = 180.0;
+                break;
+            case EAST:
+                angle = 90.0;
+                break;
+            case WEST:
+                angle = 270.0;
+                break;
+            case NORTH_EAST:
+                angle = 45.0;
+                break;
+            case NORTH_WEST:
+                angle = 315.0;
+                break;
+            case SOUTH_EAST:
+                angle = 135.0;
+                break;
+            case SOUTH_WEST:
+                angle = 225.0;
+                break;
+        }
+        return Math.toRadians(angle);
+    }
+
+    @Override
+    public int getIconWidth() {
+        return icon.getIconWidth();
+    }
+
+    @Override
+    public int getIconHeight() {
+        return icon.getIconHeight();
+    }
+
+    public Alignment getOrientation() {
+        return alignment;
+    }
+
+    public void setOrientation(final Alignment alignment) {
+        this.alignment = alignment;
+    }
+}

src/main/java/com/weis/darklaf/theme/Theme.java

@@ -27,7 +27,7 @@ public abstract class Theme {
             "borders", "button", "checkBox", "colorChooser", "comboBox", "fileChooser", "tristate",
             "internalFrame", "label", "list", "menu", "menuBar", "menuItem", "optionPane", "panel", "popupMenu",
             "progressBar", "radioButton", "rootPane", "scrollBar", "scrollPane", "separator", "slider", "spinner",
-            "splitPane", "statusBar", "tabbedPane", "table", "text", "toggleButton", "toolBar", "toolTip", "tree",
+            "splitPane", "statusBar", "tabbedPane", "tabFrame", "table", "text", "toggleButton", "toolBar", "toolTip", "tree",
     };
 
     public void beforeInstall() {

src/main/java/com/weis/darklaf/ui/button/DarkButtonUI.java

@@ -123,8 +123,7 @@ public class DarkButtonUI extends BasicButtonUI {
                     if (isFullShadow(c)) {
                         g.fillRect(0, 0, c.getWidth(), c.getHeight());
                     } else {
-                        g.fillRoundRect(borderSize, borderSize, c.getWidth() - 2 * borderSize,
-                                        c.getHeight() - 2 * borderSize, arc, arc);
+                        g.fillRoundRect(0, 0, c.getWidth(), c.getHeight(), arc, arc);
                     }
                 }
             } else {

src/main/java/com/weis/darklaf/ui/menu/DarkMenuItemUIBase.java

@@ -63,6 +63,9 @@ public class DarkMenuItemUIBase extends BasicMenuItemUI {
         return new DarkMenuItemUIBase();
     }
 
+    protected static void loadActionMap(@NotNull final LazyActionMap map) {
+        map.put(new Actions(Actions.CLICK));
+    }
 
     @Override
     public void installUI(final JComponent c) {
@@ -73,13 +76,6 @@ public class DarkMenuItemUIBase extends BasicMenuItemUI {
         arrowIcon = null;
     }
 
-    protected DarkMenuItemUIBase.Handler getHandler() {
-        if (handler == null) {
-            handler = new DarkMenuItemUIBase.Handler();
-        }
-        return handler;
-    }
-
     protected void paintMenuItem(@NotNull final Graphics g, final JComponent c,
                                  final Icon checkIcon, final Icon arrowIcon,
                                  final Color background, final Color foreground,
@@ -264,6 +260,111 @@ public class DarkMenuItemUIBase extends BasicMenuItemUI {
      * Code from BasicMenuItemUI.
      */
 
+    protected DarkMenuItemUIBase.Handler getHandler() {
+        if (handler == null) {
+            handler = new DarkMenuItemUIBase.Handler();
+        }
+        return handler;
+    }
+
+    protected void updateAcceleratorBinding() {
+        KeyStroke accelerator = menuItem.getAccelerator();
+        InputMap windowInputMap = SwingUtilities.getUIInputMap(menuItem, JComponent.WHEN_IN_FOCUSED_WINDOW);
+
+        if (windowInputMap != null) {
+            windowInputMap.clear();
+        }
+        if (accelerator != null) {
+            if (windowInputMap == null) {
+                windowInputMap = createInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
+                SwingUtilities.replaceUIInputMap(menuItem, JComponent.WHEN_IN_FOCUSED_WINDOW, windowInputMap);
+            }
+            windowInputMap.put(accelerator, "doClick");
+
+            int modifiers = accelerator.getModifiers();
+            if (((modifiers & InputEvent.ALT_DOWN_MASK) != 0) &&
+                    ((modifiers & InputEvent.ALT_GRAPH_DOWN_MASK) != 0)) {
+                //When both ALT and ALT_GRAPH are set, add the ALT only
+                // modifier keystroke which is used for left ALT key.
+                // Unsetting the ALT_GRAPH will do that as ALT is already set
+                modifiers &= ~InputEvent.ALT_GRAPH_DOWN_MASK;
+                modifiers &= ~InputEvent.ALT_GRAPH_MASK;
+                KeyStroke keyStroke = KeyStroke.getKeyStroke(accelerator.getKeyCode(),
+                                                             modifiers, accelerator.isOnKeyRelease());
+                windowInputMap.put(keyStroke, "doClick");
+            } else if (((modifiers & InputEvent.ALT_DOWN_MASK) != 0) && (
+                    (modifiers & InputEvent.ALT_GRAPH_DOWN_MASK) == 0)) {
+                //When only ALT modifier is set, add the ALT + ALT_GRAPH
+                // modifier keystroke which is used for right ALT key
+                modifiers |= InputEvent.ALT_GRAPH_DOWN_MASK;
+                KeyStroke keyStroke = KeyStroke.getKeyStroke(accelerator.getKeyCode(),
+                                                             modifiers, accelerator.isOnKeyRelease());
+                windowInputMap.put(keyStroke, "doClick");
+            } else if ((modifiers & InputEvent.ALT_GRAPH_DOWN_MASK) != 0) {
+                //When only ALT_GRAPH is set, remove the ALT_GRAPH only
+                // modifier and add the ALT and ALT+ALT_GRAPH modifiers
+                // keystroke which are used for left ALT key and right ALT
+                // respectively
+                modifiers &= ~InputEvent.ALT_GRAPH_DOWN_MASK;
+                modifiers &= ~InputEvent.ALT_GRAPH_MASK;
+
+                modifiers |= InputEvent.ALT_DOWN_MASK;
+                KeyStroke keyStroke = KeyStroke.getKeyStroke(accelerator.getKeyCode(),
+                                                             modifiers, accelerator.isOnKeyRelease());
+                windowInputMap.put(keyStroke, "doClick");
+
+                //Add ALT+ALT_GRAPH modifier which is used for right ALT key
+                modifiers |= InputEvent.ALT_GRAPH_DOWN_MASK;
+                keyStroke = KeyStroke.getKeyStroke(accelerator.getKeyCode(),
+                                                   modifiers, accelerator.isOnKeyRelease());
+                windowInputMap.put(keyStroke, "doClick");
+            }
+        }
+    }
+
+    protected InputMap createInputMap(final int condition) {
+        if (condition == JComponent.WHEN_IN_FOCUSED_WINDOW) {
+            return new ComponentInputMapUIResource(menuItem);
+        }
+        return null;
+    }
+
+    protected void updateCheckIcon() {
+        String prefix = getPropertyPrefix();
+
+        if (checkIcon == null || checkIcon instanceof UIResource) {
+            checkIcon = UIManager.getIcon(prefix + ".checkIcon");
+            //In case of column layout, .checkIconFactory is defined for this UI,
+            //the icon is compatible with it and useCheckAndArrow() is true,
+            //then the icon is handled by the checkIcon.
+            boolean isColumnLayout = MenuItemLayoutHelper.isColumnLayout(
+                    menuItem.getComponentOrientation().isLeftToRight(), menuItem);
+            if (isColumnLayout) {
+                MenuItemCheckIconFactory iconFactory =
+                        (MenuItemCheckIconFactory) UIManager.get(prefix + ".checkIconFactory");
+                if (iconFactory != null
+                        && MenuItemLayoutHelper.useCheckAndArrow(menuItem)
+                        && iconFactory.isCompatible(checkIcon, prefix)) {
+                    checkIcon = iconFactory.getIcon(menuItem);
+                }
+            }
+        }
+    }
+
+    private static class Actions extends UIAction {
+        private static final String CLICK = "doClick";
+
+        Actions(final String key) {
+            super(key);
+        }
+
+        public void actionPerformed(final ActionEvent e) {
+            JMenuItem mi = (JMenuItem) e.getSource();
+            MenuSelectionManager.defaultManager().clearSelectedPath();
+            mi.doClick();
+        }
+    }
+
     protected class Handler implements MenuDragMouseListener, MouseInputListener, PropertyChangeListener {
         //
         // MouseInputListener
@@ -339,15 +440,15 @@ public class DarkMenuItemUIBase extends BasicMenuItemUI {
             manager.setSelectedPath(path);
         }
 
+        public void menuDragMouseExited(final MenuDragMouseEvent e) {
+        }
+
         public void menuDragMouseDragged(@NotNull final MenuDragMouseEvent e) {
             MenuSelectionManager manager = e.getMenuSelectionManager();
             MenuElement[] path = e.getPath();
             manager.setSelectedPath(path);
         }
 
-        public void menuDragMouseExited(final MenuDragMouseEvent e) {
-        }
-
         public void menuDragMouseReleased(final MenuDragMouseEvent e) {
             if (!menuItem.isEnabled()) {
                 return;
@@ -388,106 +489,4 @@ public class DarkMenuItemUIBase extends BasicMenuItemUI {
             }
         }
     }
-
-    protected void updateAcceleratorBinding() {
-        KeyStroke accelerator = menuItem.getAccelerator();
-        InputMap windowInputMap = SwingUtilities.getUIInputMap(menuItem, JComponent.WHEN_IN_FOCUSED_WINDOW);
-
-        if (windowInputMap != null) {
-            windowInputMap.clear();
-        }
-        if (accelerator != null) {
-            if (windowInputMap == null) {
-                windowInputMap = createInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
-                SwingUtilities.replaceUIInputMap(menuItem, JComponent.WHEN_IN_FOCUSED_WINDOW, windowInputMap);
-            }
-            windowInputMap.put(accelerator, "doClick");
-
-            int modifiers = accelerator.getModifiers();
-            if (((modifiers & InputEvent.ALT_DOWN_MASK) != 0) &&
-                    ((modifiers & InputEvent.ALT_GRAPH_DOWN_MASK) != 0)) {
-                //When both ALT and ALT_GRAPH are set, add the ALT only
-                // modifier keystroke which is used for left ALT key.
-                // Unsetting the ALT_GRAPH will do that as ALT is already set
-                modifiers &= ~InputEvent.ALT_GRAPH_DOWN_MASK;
-                modifiers &= ~InputEvent.ALT_GRAPH_MASK;
-                KeyStroke keyStroke = KeyStroke.getKeyStroke(accelerator.getKeyCode(),
-                                                             modifiers, accelerator.isOnKeyRelease());
-                windowInputMap.put(keyStroke, "doClick");
-            } else if (((modifiers & InputEvent.ALT_DOWN_MASK) != 0) && (
-                    (modifiers & InputEvent.ALT_GRAPH_DOWN_MASK) == 0)) {
-                //When only ALT modifier is set, add the ALT + ALT_GRAPH
-                // modifier keystroke which is used for right ALT key
-                modifiers |= InputEvent.ALT_GRAPH_DOWN_MASK;
-                KeyStroke keyStroke = KeyStroke.getKeyStroke(accelerator.getKeyCode(),
-                                                             modifiers, accelerator.isOnKeyRelease());
-                windowInputMap.put(keyStroke, "doClick");
-            } else if ((modifiers & InputEvent.ALT_GRAPH_DOWN_MASK) != 0) {
-                //When only ALT_GRAPH is set, remove the ALT_GRAPH only
-                // modifier and add the ALT and ALT+ALT_GRAPH modifiers
-                // keystroke which are used for left ALT key and right ALT
-                // respectively
-                modifiers &= ~InputEvent.ALT_GRAPH_DOWN_MASK;
-                modifiers &= ~InputEvent.ALT_GRAPH_MASK;
-
-                modifiers |= InputEvent.ALT_DOWN_MASK;
-                KeyStroke keyStroke = KeyStroke.getKeyStroke(accelerator.getKeyCode(),
-                                                             modifiers, accelerator.isOnKeyRelease());
-                windowInputMap.put(keyStroke, "doClick");
-
-                //Add ALT+ALT_GRAPH modifier which is used for right ALT key
-                modifiers |= InputEvent.ALT_GRAPH_DOWN_MASK;
-                keyStroke = KeyStroke.getKeyStroke(accelerator.getKeyCode(),
-                                                   modifiers, accelerator.isOnKeyRelease());
-                windowInputMap.put(keyStroke, "doClick");
-            }
-        }
-    }
-
-    protected InputMap createInputMap(final int condition) {
-        if (condition == JComponent.WHEN_IN_FOCUSED_WINDOW) {
-            return new ComponentInputMapUIResource(menuItem);
-        }
-        return null;
-    }
-
-    protected void updateCheckIcon() {
-        String prefix = getPropertyPrefix();
-
-        if (checkIcon == null || checkIcon instanceof UIResource) {
-            checkIcon = UIManager.getIcon(prefix + ".checkIcon");
-            //In case of column layout, .checkIconFactory is defined for this UI,
-            //the icon is compatible with it and useCheckAndArrow() is true,
-            //then the icon is handled by the checkIcon.
-            boolean isColumnLayout = MenuItemLayoutHelper.isColumnLayout(
-                    menuItem.getComponentOrientation().isLeftToRight(), menuItem);
-            if (isColumnLayout) {
-                MenuItemCheckIconFactory iconFactory =
-                        (MenuItemCheckIconFactory) UIManager.get(prefix + ".checkIconFactory");
-                if (iconFactory != null
-                        && MenuItemLayoutHelper.useCheckAndArrow(menuItem)
-                        && iconFactory.isCompatible(checkIcon, prefix)) {
-                    checkIcon = iconFactory.getIcon(menuItem);
-                }
-            }
-        }
-    }
-
-    protected static void loadActionMap(@NotNull final LazyActionMap map) {
-        map.put(new Actions(Actions.CLICK));
-    }
-
-    private static class Actions extends UIAction {
-        private static final String CLICK = "doClick";
-
-        Actions(final String key) {
-            super(key);
-        }
-
-        public void actionPerformed(final ActionEvent e) {
-            JMenuItem mi = (JMenuItem) e.getSource();
-            MenuSelectionManager.defaultManager().clearSelectedPath();
-            mi.doClick();
-        }
-    }
 }

src/main/java/com/weis/darklaf/ui/menu/DarkMenuUI.java

@@ -34,30 +34,25 @@ import java.util.Objects;
  */
 public class DarkMenuUI extends DarkMenuItemUIBase {
 
+    /* diagnostic aids -- should be false for production builds. */
+    private static final boolean TRACE = false; // trace creates and disposes
+    private static final boolean VERBOSE = false; // show reuse hits/misses
+    private static final boolean DEBUG = false;  // show bad params, misc.
+    private static boolean crossMenuMnemonic = true;
     /**
      * The instance of {@code ChangeListener}.
      */
     protected ChangeListener changeListener;
-
     /**
      * The instance of {@code MenuListener}.
      */
     protected MenuListener menuListener;
-
     private int lastMnemonic = 0;
-
     /**
      * Uses as the parent of the windowInputMap when selected.
      */
     private InputMap selectedWindowInputMap;
 
-    /* diagnostic aids -- should be false for production builds. */
-    private static final boolean TRACE = false; // trace creates and disposes
-    private static final boolean VERBOSE = false; // show reuse hits/misses
-    private static final boolean DEBUG = false;  // show bad params, misc.
-
-    private static boolean crossMenuMnemonic = true;
-
     /**
      * Constructs a new instance of {@code BasicMenuUI}.
      *
@@ -75,6 +70,37 @@ public class DarkMenuUI extends DarkMenuItemUIBase {
         map.put(new Actions(Actions.SELECT, null, true));
     }
 
+    private static void appendPath(@NotNull final MenuElement[] path, final MenuElement elem) {
+        MenuElement[] newPath = new MenuElement[path.length + 1];
+        System.arraycopy(path, 0, newPath, 0, path.length);
+        newPath[path.length] = elem;
+        MenuSelectionManager.defaultManager().setSelectedPath(newPath);
+    }
+
+    @NotNull
+    protected static java.util.List<JPopupMenu> getPopups() {
+        MenuSelectionManager msm = MenuSelectionManager.defaultManager();
+        MenuElement[] p = msm.getSelectedPath();
+
+        java.util.List<JPopupMenu> list = new ArrayList<JPopupMenu>(p.length);
+        for (MenuElement element : p) {
+            if (element instanceof JPopupMenu) {
+                list.add((JPopupMenu) element);
+            }
+        }
+        return list;
+    }
+
+    protected static JPopupMenu getLastPopup() {
+        MenuSelectionManager msm = MenuSelectionManager.defaultManager();
+        MenuElement[] p = msm.getSelectedPath();
+        JPopupMenu popup = null;
+
+        for (int i = p.length - 1; popup == null && i >= 0; i--) {
+            if (p[i] instanceof JPopupMenu) { popup = (JPopupMenu) p[i]; }
+        }
+        return popup;
+    }
 
     protected void installDefaults() {
         super.installDefaults();
@@ -104,11 +130,6 @@ public class DarkMenuUI extends DarkMenuItemUIBase {
         updateMnemonicBinding();
     }
 
-    void installLazyActionMap() {
-        LazyActionMap.installLazyActionMap(menuItem, BasicMenuUI.class,
-                                           getPropertyPrefix() + ".actionMap");
-    }
-
     @SuppressWarnings("deprecation")
     void updateMnemonicBinding() {
         int mnemonic = menuItem.getModel().getMnemonic();
@@ -144,46 +165,6 @@ public class DarkMenuUI extends DarkMenuItemUIBase {
         lastMnemonic = mnemonic;
     }
 
-    protected void uninstallKeyboardActions() {
-        super.uninstallKeyboardActions();
-        lastMnemonic = 0;
-    }
-
-    protected MouseInputListener createMouseInputListener(final JComponent c) {
-        return getHandler();
-    }
-
-    /**
-     * Returns an instance of {@code MenuListener}.
-     *
-     * @param c a component
-     * @return an instance of {@code MenuListener}
-     */
-    protected MenuListener createMenuListener(final JComponent c) {
-        return null;
-    }
-
-    /**
-     * Returns an instance of {@code ChangeListener}.
-     *
-     * @param c a component
-     * @return an instance of {@code ChangeListener}
-     */
-    protected ChangeListener createChangeListener(final JComponent c) {
-        return null;
-    }
-
-    protected PropertyChangeListener createPropertyChangeListener(final JComponent c) {
-        return getHandler();
-    }
-
-    protected DarkMenuItemUIBase.Handler getHandler() {
-        if (handler == null) {
-            handler = new DarkMenuUI.Handler();
-        }
-        return handler;
-    }
-
     protected void uninstallDefaults() {
         menuItem.setArmed(false);
         menuItem.setSelected(false);
@@ -203,6 +184,22 @@ public class DarkMenuUI extends DarkMenuItemUIBase {
         handler = null;
     }
 
+    protected void uninstallKeyboardActions() {
+        super.uninstallKeyboardActions();
+        lastMnemonic = 0;
+    }
+
+    protected MouseInputListener createMouseInputListener(final JComponent c) {
+        return getHandler();
+    }
+
+    protected DarkMenuItemUIBase.Handler getHandler() {
+        if (handler == null) {
+            handler = new DarkMenuUI.Handler();
+        }
+        return handler;
+    }
+
     protected MenuDragMouseListener createMenuDragMouseListener(final JComponent c) {
         return getHandler();
     }
@@ -211,6 +208,10 @@ public class DarkMenuUI extends DarkMenuItemUIBase {
         return (MenuKeyListener) getHandler();
     }
 
+    protected PropertyChangeListener createPropertyChangeListener(final JComponent c) {
+        return getHandler();
+    }
+
     public Dimension getMinimumSize(final JComponent c) {
         return (((JMenu) menuItem).isTopLevelMenu()) ?
                c.getPreferredSize() : null;
@@ -224,6 +225,49 @@ public class DarkMenuUI extends DarkMenuItemUIBase {
         return null;
     }
 
+    /**
+     * Returns an instance of {@code ChangeListener}.
+     *
+     * @param c a component
+     * @return an instance of {@code ChangeListener}
+     */
+    protected ChangeListener createChangeListener(final JComponent c) {
+        return null;
+    }
+
+    /**
+     * Returns an instance of {@code MenuListener}.
+     *
+     * @param c a component
+     * @return an instance of {@code MenuListener}
+     */
+    protected MenuListener createMenuListener(final JComponent c) {
+        return null;
+    }
+
+    /*
+     * Set the background color depending on whether this is a toplevel menu
+     * in a menubar or a submenu of another menu.
+     */
+    private void updateDefaultBackgroundColor() {
+        if (!UIManager.getBoolean("Menu.useMenuBarBackgroundForTopLevel")) {
+            return;
+        }
+        JMenu menu = (JMenu) menuItem;
+        if (menu.getBackground() instanceof UIResource) {
+            if (menu.isTopLevelMenu()) {
+                menu.setBackground(UIManager.getColor("MenuBar.background"));
+            } else {
+                menu.setBackground(UIManager.getColor(getPropertyPrefix() + ".background"));
+            }
+        }
+    }
+
+    void installLazyActionMap() {
+        LazyActionMap.installLazyActionMap(menuItem, BasicMenuUI.class,
+                                           getPropertyPrefix() + ".actionMap");
+    }
+
     /**
      * Sets timer to the {@code menu}.
      *
@@ -235,13 +279,6 @@ public class DarkMenuUI extends DarkMenuItemUIBase {
         timer.start();
     }
 
-    private static void appendPath(@NotNull final MenuElement[] path, final MenuElement elem) {
-        MenuElement[] newPath = new MenuElement[path.length + 1];
-        System.arraycopy(path, 0, newPath, 0, path.length);
-        newPath[path.length] = elem;
-        MenuSelectionManager.defaultManager().setSelectedPath(newPath);
-    }
-
     private static class Actions extends UIAction {
         private static final String SELECT = "selectMenu";
 
@@ -256,13 +293,6 @@ public class DarkMenuUI extends DarkMenuItemUIBase {
             this.force = shouldForce;
         }
 
-        private JMenu getMenu(final ActionEvent e) {
-            if (e.getSource() instanceof JMenu) {
-                return (JMenu) e.getSource();
-            }
-            return menu;
-        }
-
         public void actionPerformed(final ActionEvent e) {
             JMenu menu = getMenu(e);
             if (!crossMenuMnemonic) {
@@ -302,6 +332,13 @@ public class DarkMenuUI extends DarkMenuItemUIBase {
             }
         }
 
+        private JMenu getMenu(final ActionEvent e) {
+            if (e.getSource() instanceof JMenu) {
+                return (JMenu) e.getSource();
+            }
+            return menu;
+        }
+
         @Override
         public boolean accept(final Object c) {
             if (c instanceof JMenu) {
@@ -311,24 +348,6 @@ public class DarkMenuUI extends DarkMenuItemUIBase {
         }
     }
 
-    /*
-     * Set the background color depending on whether this is a toplevel menu
-     * in a menubar or a submenu of another menu.
-     */
-    private void updateDefaultBackgroundColor() {
-        if (!UIManager.getBoolean("Menu.useMenuBarBackgroundForTopLevel")) {
-            return;
-        }
-        JMenu menu = (JMenu) menuItem;
-        if (menu.getBackground() instanceof UIResource) {
-            if (menu.isTopLevelMenu()) {
-                menu.setBackground(UIManager.getColor("MenuBar.background"));
-            } else {
-                menu.setBackground(UIManager.getColor(getPropertyPrefix() + ".background"));
-            }
-        }
-    }
-
     /**
      * Instantiated and used by a menu item to handle the current menu selection
      * from mouse events. A MouseInputHandler processes and forwards all mouse events
@@ -446,21 +465,6 @@ public class DarkMenuUI extends DarkMenuItemUIBase {
     }
 
     private class Handler extends DarkMenuItemUIBase.Handler implements MenuKeyListener {
-        //
-        // PropertyChangeListener
-        //
-        public void propertyChange(final PropertyChangeEvent e) {
-            if (Objects.equals(e.getPropertyName(), AbstractButton.
-                    MNEMONIC_CHANGED_PROPERTY)) {
-                updateMnemonicBinding();
-            } else {
-                if (e.getPropertyName().equals("ancestor")) {
-                    updateDefaultBackgroundColor();
-                }
-                super.propertyChange(e);
-            }
-        }
-
         //
         // MouseInputListener
         //
@@ -578,7 +582,6 @@ public class DarkMenuUI extends DarkMenuItemUIBase {
         public void mouseMoved(final MouseEvent e) {
         }
 
-
         //
         // MenuDragHandler
         //
@@ -621,6 +624,21 @@ public class DarkMenuUI extends DarkMenuItemUIBase {
         public void menuDragMouseReleased(final MenuDragMouseEvent e) {
         }
 
+        //
+        // PropertyChangeListener
+        //
+        public void propertyChange(final PropertyChangeEvent e) {
+            if (Objects.equals(e.getPropertyName(), AbstractButton.
+                    MNEMONIC_CHANGED_PROPERTY)) {
+                updateMnemonicBinding();
+            } else {
+                if (e.getPropertyName().equals("ancestor")) {
+                    updateDefaultBackgroundColor();
+                }
+                super.propertyChange(e);
+            }
+        }
+
         //
         // MenuKeyListener
         //
@@ -667,29 +685,4 @@ public class DarkMenuUI extends DarkMenuItemUIBase {
         public void menuKeyReleased(final MenuKeyEvent e) {
         }
     }
-
-    @NotNull
-    protected static java.util.List<JPopupMenu> getPopups() {
-        MenuSelectionManager msm = MenuSelectionManager.defaultManager();
-        MenuElement[] p = msm.getSelectedPath();
-
-        java.util.List<JPopupMenu> list = new ArrayList<JPopupMenu>(p.length);
-        for (MenuElement element : p) {
-            if (element instanceof JPopupMenu) {
-                list.add((JPopupMenu) element);
-            }
-        }
-        return list;
-    }
-
-    protected static JPopupMenu getLastPopup() {
-        MenuSelectionManager msm = MenuSelectionManager.defaultManager();
-        MenuElement[] p = msm.getSelectedPath();
-        JPopupMenu popup = null;
-
-        for (int i = p.length - 1; popup == null && i >= 0; i--) {
-            if (p[i] instanceof JPopupMenu) { popup = (JPopupMenu) p[i]; }
-        }
-        return popup;
-    }
 }

src/main/java/com/weis/darklaf/ui/splitpane/DarkSplitPaneBorder.java

@@ -0,0 +1,33 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.ui.splitpane;
+
+import javax.swing.plaf.BorderUIResource;
+
+public class DarkSplitPaneBorder extends BorderUIResource.EmptyBorderUIResource {
+
+    public DarkSplitPaneBorder() {
+        super(0, 0, 0, 0);
+    }
+}

src/main/java/com/weis/darklaf/ui/splitpane/DarkSplitPaneUI.java

@@ -28,9 +28,7 @@ import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NotNull;
 
 import javax.swing.*;
-import javax.swing.border.Border;
 import javax.swing.plaf.ComponentUI;
-import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicSplitPaneDivider;
 import javax.swing.plaf.basic.BasicSplitPaneUI;
 import java.awt.*;
@@ -44,7 +42,6 @@ public class DarkSplitPaneUI extends BasicSplitPaneUI implements PropertyChangeL
 
     private static final int DIVIDER_DRAG_SIZE = 10;
     private static final int DIVIDER_DRAG_OFFSET = 5;
-    private int defaultDividerSize;
     private Style style;
 
     protected DarkSplitPaneUI(final Style style) {
@@ -60,13 +57,8 @@ public class DarkSplitPaneUI extends BasicSplitPaneUI implements PropertyChangeL
     @Override
     public void installUI(final JComponent c) {
         super.installUI(c);
-        defaultDividerSize = splitPane.getDividerSize();
-        if (style == Style.LINE) {
-            splitPane.setDividerSize(1);
-        } else if (style == Style.INVISIBLE) {
-            splitPane.setDividerSize(0);
-        }
         splitPane.setContinuousLayout(true);
+        splitPane.setComponentZOrder(getDivider(), 0);
     }
 
     @Override
@@ -81,6 +73,7 @@ public class DarkSplitPaneUI extends BasicSplitPaneUI implements PropertyChangeL
             splitPane.setLayout(null);
         }
         super.uninstallUI(c);
+        divider = null;
     }
 
     @Override
@@ -135,20 +128,7 @@ public class DarkSplitPaneUI extends BasicSplitPaneUI implements PropertyChangeL
             }
             if (oldStyle != style) {
                 if (style == Style.DEFAULT || oldStyle == Style.DEFAULT) {
-                    splitPane.setDividerSize(defaultDividerSize);
-                    splitPane.remove(divider);
-                    divider = createDefaultDivider();
-                    Border b = divider.getBorder();
-                    if (!(b instanceof UIResource)) {
-                        divider.setBorder(UIManager.getBorder("SplitPaneDivider.border"));
-                    }
-                    Integer temp = (Integer) UIManager.get("SplitPane.dividerSize");
-                    LookAndFeel.installProperty(splitPane, "dividerSize", temp == null ? 10 : temp);
-
-                    divider.setDividerSize(splitPane.getDividerSize());
-                    dividerSize = divider.getDividerSize();
-                    splitPane.add(divider, JSplitPane.DIVIDER);
-                    splitPane.invalidate();
+                    splitPane.setUI(new DarkSplitPaneUI(style));
                 }
             }
         }
@@ -188,9 +168,9 @@ public class DarkSplitPaneUI extends BasicSplitPaneUI implements PropertyChangeL
             if (style == Style.LINE) {
                 g.setColor(getDividerLineColor());
                 if (orientation == JSplitPane.HORIZONTAL_SPLIT) {
-                    g.drawLine(DIVIDER_DRAG_OFFSET, 0, DIVIDER_DRAG_OFFSET, getHeight() - 1);
+                    g.drawLine(DIVIDER_DRAG_OFFSET, 0, DIVIDER_DRAG_OFFSET, getHeight());
                 } else {
-                    g.drawLine(0, DIVIDER_DRAG_OFFSET, getWidth() - 1, DIVIDER_DRAG_OFFSET);
+                    g.drawLine(0, DIVIDER_DRAG_OFFSET, getWidth(), DIVIDER_DRAG_OFFSET);
                 }
             }
         }

src/main/java/com/weis/darklaf/ui/tabbedpane/DarkHandler.java

@@ -88,7 +88,7 @@ public class DarkHandler extends TabbedPaneHandler {
             ui.tabPane.remove(ui.leadingComp);
             var val = e.getNewValue();
             if (val instanceof Component) {
-                ui.leadingComp = (Component) val;
+                ui.leadingComp = ui.wrapClientComponent((Component) val);
                 ui.tabPane.add(ui.leadingComp);
             } else {
                 ui.leadingComp = null;
@@ -97,7 +97,7 @@ public class DarkHandler extends TabbedPaneHandler {
             ui.tabPane.remove(ui.trailingComp);
             var val = e.getNewValue();
             if (val instanceof Component) {
-                ui.trailingComp = (Component) val;
+                ui.trailingComp = ui.wrapClientComponent((Component) val);
                 ui.tabPane.add(ui.trailingComp);
             } else {
                 ui.trailingComp = null;
@@ -112,7 +112,7 @@ public class DarkHandler extends TabbedPaneHandler {
             ui.tabPane.remove(ui.northComp);
             var val = e.getNewValue();
             if (val instanceof Component) {
-                ui.northComp = (Component) val;
+                ui.northComp = ui.wrapClientComponent((Component) val);
                 ui.tabPane.add(ui.northComp);
             } else {
                 ui.northComp = null;
@@ -121,7 +121,7 @@ public class DarkHandler extends TabbedPaneHandler {
             ui.tabPane.remove(ui.southComp);
             var val = e.getNewValue();
             if (val instanceof Component) {
-                ui.southComp = (Component) val;
+                ui.southComp = ui.wrapClientComponent((Component) val);
                 ui.tabPane.add(ui.southComp);
             } else {
                 ui.southComp = null;
@@ -130,7 +130,7 @@ public class DarkHandler extends TabbedPaneHandler {
             ui.tabPane.remove(ui.eastComp);
             var val = e.getNewValue();
             if (val instanceof Component) {
-                ui.eastComp = (Component) val;
+                ui.eastComp = ui.wrapClientComponent((Component) val);
                 ui.tabPane.add(ui.eastComp);
             } else {
                 ui.eastComp = null;
@@ -139,7 +139,7 @@ public class DarkHandler extends TabbedPaneHandler {
             ui.tabPane.remove(ui.westComp);
             var val = e.getNewValue();
             if (val instanceof Component) {
-                ui.westComp = (Component) val;
+                ui.westComp = ui.wrapClientComponent((Component) val);
                 ui.tabPane.add(ui.westComp);
             } else {
                 ui.westComp = null;

src/main/java/com/weis/darklaf/ui/tabbedpane/DarkScrollableTabSupport.java

@@ -56,11 +56,11 @@ public class DarkScrollableTabSupport extends ScrollableTabSupport implements Mo
         viewport.setView(tabPanel);
         viewport.addMouseWheelListener(this);
 
-        moreTabsButton = new MoreTabsButton(ui);
+        moreTabsButton = ui.createMoreTabsButton();
         moreTabsButton.setVisible(false);
         moreTabsButton.addActionListener(this);
 
-        newTabButton = new NewTabButton(ui);
+        newTabButton = ui.createNewTabButton();
         newTabButton.setVisible(Boolean.TRUE.equals(ui.tabPane.getClientProperty("JTabbedPane.showNewTabButton")));
 
         scrollPopupMenu = new ScrollPopupMenu(UIManager.getInt("TabbedPane.maxPopupHeight"));
@@ -94,8 +94,8 @@ public class DarkScrollableTabSupport extends ScrollableTabSupport implements Mo
     }
 
     @Override
-    void createButtons() {
-        super.createButtons();
+    void createButtons(final DarkTabbedPaneUIBridge ui) {
+        super.createButtons(ui);
         ui.tabPane.remove(scrollForwardButton);
         ui.tabPane.remove(scrollBackwardButton);
     }

src/main/java/com/weis/darklaf/ui/tabbedpane/DarkTabAreaButton.java

@@ -27,7 +27,7 @@ import javax.swing.*;
 import javax.swing.plaf.UIResource;
 import java.awt.*;
 
-class DarkTabAreaButton extends JButton implements UIResource {
+public class DarkTabAreaButton extends JButton implements UIResource {
 
     private DarkTabbedPaneUI ui;
 

src/main/java/com/weis/darklaf/ui/tabbedpane/DarkTabbedPaneScrollLayout.java

@@ -72,15 +72,14 @@ public class DarkTabbedPaneScrollLayout extends TabbedPaneScrollLayout {
         // Calculate how much space the tabs will need, based on the
         // minimum size required to display largest child + content border
         //
-        if (tabPlacement == SwingConstants.LEFT || tabPlacement == SwingConstants.RIGHT) {
+        if (!ui.isHorizontalTabPlacement()) {
             int tabHeight = ui.calculateTabHeight(tabPlacement, ui.tabPane.getSelectedIndex(),
                                                   ui.getFontMetrics().getHeight());
             if (ui.scrollableTabSupport.moreTabsButton.isVisible()) {
                 tabHeight += ui.scrollableTabSupport.moreTabsButton.getPreferredSize().height;
             }
             height = Math.max(height, tabHeight);
-            tabExtent = preferredTabAreaWidth(tabPlacement,
-                                              height - tabAreaInsets.top - tabAreaInsets.bottom);
+            tabExtent = preferredTabAreaWidth(tabPlacement, height - tabAreaInsets.top - tabAreaInsets.bottom);
             width += tabExtent;
         } else {
             int tabWidth = ui.calculateTabWidth(tabPlacement, ui.tabPane.getSelectedIndex(), ui.getFontMetrics());
@@ -300,7 +299,7 @@ public class DarkTabbedPaneScrollLayout extends TabbedPaneScrollLayout {
         boolean verticalTabRuns = !ui.isHorizontalTabPlacement();
         boolean leftToRight = ui.tabPane.getComponentOrientation().isLeftToRight();
 
-        if (tabPlacement == SwingConstants.LEFT || tabPlacement == SwingConstants.RIGHT) {
+        if (!ui.isHorizontalTabPlacement()) {
             ui.maxTabWidth = ui.calculateMaxTabWidth(tabPlacement);
         } else {
             ui.maxTabHeight = ui.calculateMaxTabHeight(tabPlacement);

src/main/java/com/weis/darklaf/ui/tabbedpane/DarkTabbedPaneUI.java

@@ -1,5 +1,6 @@
 package com.weis.darklaf.ui.tabbedpane;
 
+import com.weis.darklaf.components.UIResourceWrapper;
 import com.weis.darklaf.util.DarkUIUtil;
 import com.weis.darklaf.util.GraphicsContext;
 import org.jetbrains.annotations.Contract;
@@ -7,6 +8,7 @@ import org.jetbrains.annotations.NotNull;
 
 import javax.swing.*;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
 import java.awt.*;
 import java.awt.event.FocusEvent;
 import java.awt.event.FocusListener;
@@ -134,17 +136,44 @@ public class DarkTabbedPaneUI extends DarkTabbedPaneUIBridge {
         }
         var lead = tabPane.getClientProperty("JTabbedPane.leadingComponent");
         if (lead instanceof Component) {
-            leadingComp = (Component) lead;
+            leadingComp = wrapClientComponent((Component) lead);
             tabPane.add(leadingComp);
         }
         var trail = tabPane.getClientProperty("JTabbedPane.trailingComponent");
         if (trail instanceof Component) {
-            trailingComp = (Component) trail;
+            trailingComp = wrapClientComponent((Component) trail);
             tabPane.add(trailingComp);
         }
+        var north = tabPane.getClientProperty("JTabbedPane.northComponent");
+        if (north instanceof Component) {
+            northComp = wrapClientComponent((Component) north);
+            tabPane.add(northComp);
+        }
+        var south = tabPane.getClientProperty("JTabbedPane.southComponent");
+        if (south instanceof Component) {
+            southComp = wrapClientComponent((Component) south);
+            tabPane.add(southComp);
+        }
+        var west = tabPane.getClientProperty("JTabbedPane.westComponent");
+        if (west instanceof Component) {
+            westComp = wrapClientComponent((Component) west);
+            tabPane.add(westComp);
+        }
+        var east = tabPane.getClientProperty("JTabbedPane.eastComponent");
+        if (east instanceof Component) {
+            eastComp = wrapClientComponent((Component) east);
+            tabPane.add(eastComp);
+        }
         dndEnabled = Boolean.TRUE.equals(tabPane.getClientProperty("JTabbedPane.dndEnabled"));
     }
 
+    protected Component wrapClientComponent(final Component component) {
+        if (component instanceof UIResource) {
+            return component;
+        }
+        return new UIResourceWrapper(component);
+    }
+
     @Override
     protected void installListeners() {
         super.installListeners();
@@ -269,27 +298,13 @@ public class DarkTabbedPaneUI extends DarkTabbedPaneUIBridge {
         }
     }
 
-    protected Color getTabBackgroundColor(final int tabIndex, final boolean isSelected, final boolean hover) {
-        if (isSelected) {
-            return hover ? UIManager.getColor("TabbedPane.selectHighlight")
-                         : UIManager.getColor("TabbedPane.selected");
-        } else {
-            return hover ? UIManager.getColor("TabbedPane.highlight")
-                         : tabPane.getBackgroundAt(tabIndex);
-        }
-    }
-
-    @Override
-    protected void paintCroppedTabEdge(final Graphics g) {
-    }
-
     @Override
     protected void paintFocusIndicator(final Graphics g, final int tabPlacement, final Rectangle r,
                                        final int tabIndex, final Rectangle iconRect,
                                        final Rectangle textRect, final boolean isSelected) {
         if (isSelected) {
             if (!drawFocusBar()) return;
-            g.setColor(getAccentColor(DarkUIUtil.hasFocus(tabPane)));
+            g.setColor(getAccentColor());
             int focusSize = UIManager.getInt("TabbedPane.focusBarHeight");
             switch (tabPlacement) {
                 case LEFT:
@@ -308,6 +323,15 @@ public class DarkTabbedPaneUI extends DarkTabbedPaneUIBridge {
         }
     }
 
+    @Override
+    protected void paintCroppedTabEdge(final Graphics g) {
+    }
+
+    protected Color getAccentColor() {
+        boolean focus = DarkUIUtil.hasFocus(tabPane);
+        return getAccentColor(focus);
+    }
+
     @Override
     protected void paintTabBorder(@NotNull final Graphics g, final int tabPlacement, final int tabIndex,
                                   final int x, final int y, final int w, final int h,
@@ -444,6 +468,11 @@ public class DarkTabbedPaneUI extends DarkTabbedPaneUIBridge {
         return !Boolean.FALSE.equals(tabPane.getClientProperty("JTabbedPane.drawFocusBar"));
     }
 
+    @Override
+    protected int calculateTabHeight(final int tabPlacement, final int tabIndex, final int fontHeight) {
+        return super.calculateTabHeight(tabPlacement, tabIndex, fontHeight) - 1;
+    }
+
     protected Color getAccentColor(final boolean focus) {
         return focus ? UIManager.getColor("TabbedPane.accentFocus")
                      : UIManager.getColor("TabbedPane.accent");
@@ -498,8 +527,14 @@ public class DarkTabbedPaneUI extends DarkTabbedPaneUIBridge {
         }
     }
 
-    protected Icon getNewTabIcon() {
-        return UIManager.getIcon("TabbedPane.newTab.icon");
+    protected Color getTabBackgroundColor(final int tabIndex, final boolean isSelected, final boolean hover) {
+        if (isSelected) {
+            return hover ? UIManager.getColor("TabbedPane.selectedHoverBackground")
+                         : UIManager.getColor("TabbedPane.selectedBackground");
+        } else {
+            return hover ? UIManager.getColor("TabbedPane.hoverBackground")
+                         : tabPane.getBackgroundAt(tabIndex);
+        }
     }
 
     protected Icon getMoreTabsIcon() {
@@ -613,4 +648,16 @@ public class DarkTabbedPaneUI extends DarkTabbedPaneUIBridge {
         }
     }
 
+    public Icon getNewTabIcon() {
+        return UIManager.getIcon("TabbedPane.newTab.icon");
+    }
+
+    public JComponent createNewTabButton() {
+        return new NewTabButton(this);
+    }
+
+    public JButton createMoreTabsButton() {
+        return new MoreTabsButton(this);
+    }
+
 }

src/main/java/com/weis/darklaf/ui/tabbedpane/MoreTabsButton.java

@@ -30,14 +30,14 @@ import org.jetbrains.annotations.NotNull;
 import javax.swing.*;
 import java.awt.*;
 
-class MoreTabsButton extends DarkTabAreaButton {
+public class MoreTabsButton extends DarkTabAreaButton {
 
     protected final static String INFINITY = "\u221e";
     protected final static int PAD = 2;
     private DarkTabbedPaneUI ui;
     protected final Icon icon;
 
-    protected MoreTabsButton(final DarkTabbedPaneUI ui) {
+    public MoreTabsButton(final DarkTabbedPaneUI ui) {
         super(ui);
         this.ui = ui;
         icon = ui.getMoreTabsIcon();

src/main/java/com/weis/darklaf/ui/tabbedpane/NewTabButton.java

@@ -29,31 +29,36 @@ import javax.swing.*;
 import javax.swing.plaf.UIResource;
 import java.awt.*;
 
-class NewTabButton extends JPanel implements UIResource {
+public class NewTabButton extends JPanel implements UIResource {
 
-    private DarkTabbedPaneUI ui;
+    protected DarkTabbedPaneUI ui;
     protected final JButton button;
 
     protected NewTabButton(@NotNull final DarkTabbedPaneUI ui) {
         this.ui = ui;
-        button = new JButton();
-        button.setIcon(ui.getNewTabIcon());
-        button.putClientProperty("JButton.variant", "shadow");
-        button.putClientProperty("JButton.buttonType", "square");
-        button.putClientProperty("JButton.thin", Boolean.TRUE);
-        button.setRolloverEnabled(true);
+        button = createButton();
         button.addActionListener(e -> {
             var action = ui.getNewTabAction();
             if (action != null) {
                 action.actionPerformed(e);
             }
         });
-        button.setOpaque(false);
         add(button);
         setOpaque(false);
         setLayout(null);
     }
 
+    protected JButton createButton() {
+        var button = new JButton();
+        button.setIcon(ui.getNewTabIcon());
+        button.putClientProperty("JButton.variant", "shadow");
+        button.putClientProperty("JButton.buttonType", "square");
+        button.putClientProperty("JButton.thin", Boolean.TRUE);
+        button.setRolloverEnabled(true);
+        button.setOpaque(false);
+        return button;
+    }
+
     @Override
     public void doLayout() {
         var b = button.getPreferredSize();

src/main/java/com/weis/darklaf/ui/tabbedpane/ScrollableTabSupport.java

@@ -47,13 +47,13 @@ class ScrollableTabSupport implements ActionListener, ChangeListener {
         viewport.setView(tabPanel);
         viewport.addChangeListener(this);
         croppedEdge = new CroppedEdge(ui);
-        createButtons();
+        createButtons(ui);
     }
 
     /**
      * Recreates the scroll buttons and adds them to the TabbedPane.
      */
-    void createButtons() {
+    void createButtons(final DarkTabbedPaneUIBridge ui) {
         if (scrollForwardButton != null) {
             ui.tabPane.remove(scrollForwardButton);
             scrollForwardButton.removeActionListener(this);

src/main/java/com/weis/darklaf/ui/tabbedpane/TabbedPaneHandler.java

@@ -77,7 +77,7 @@ public class TabbedPaneHandler implements ChangeListener, ContainerListener, Foc
             ui.calculatedBaseline = false;
         } else if (Objects.equals(name, "tabPlacement")) {
             if (ui.scrollableTabLayoutEnabled()) {
-                ui.tabScroller.createButtons();
+                ui.tabScroller.createButtons(ui);
             }
             ui.calculatedBaseline = false;
         } else if (Objects.equals(name, "opaque") && isScrollLayout) {

src/main/java/com/weis/darklaf/ui/tabframe/DarkPanelPopupUI.java

@@ -0,0 +1,382 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.ui.tabframe;
+
+import com.weis.darklaf.components.JLabelUIResource;
+import com.weis.darklaf.components.alignment.Alignment;
+import com.weis.darklaf.components.border.MutableLineBorder;
+import com.weis.darklaf.components.tabframe.PanelPopup;
+import com.weis.darklaf.components.tabframe.TabFrame;
+import com.weis.darklaf.components.tooltip.ToolTipContext;
+import com.weis.darklaf.ui.panel.DarkPanelUI;
+import com.weis.darklaf.util.DarkUIUtil;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+
+import javax.swing.*;
+import javax.swing.border.EmptyBorder;
+import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
+import java.awt.*;
+import java.awt.event.AWTEventListener;
+import java.awt.event.ActionEvent;
+import java.awt.event.FocusEvent;
+import java.awt.event.MouseEvent;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+
+public class DarkPanelPopupUI extends DarkPanelUI implements PropertyChangeListener, AWTEventListener {
+
+
+    protected HeaderButton closeButton;
+    private final Action closeAction = new AbstractAction() {
+        @Override
+        public void actionPerformed(final ActionEvent e) {
+            closeButton.doClick();
+        }
+    };
+    protected JPanel content;
+    protected JLabel label;
+    protected Color headerFocusBackground;
+    protected Color headerButtonFocusHoverBackground;
+    protected Color headerButtonFocusClickBackground;
+    protected Color headerBackground;
+    protected Color headerButtonHoverBackground;
+    protected Color headerButtonClickBackground;
+    protected String accelerator;
+    private PanelPopup popupComponent;
+    private JPanel header;
+    private MutableLineBorder headerBorder;
+    private MutableLineBorder contentBorder;
+    private boolean oldFocus;
+
+    @NotNull
+    @Contract("_ -> new")
+    public static ComponentUI createUI(final JComponent c) {
+        return new DarkPanelPopupUI();
+    }
+
+    @Override
+    public void installUI(final JComponent c) {
+        popupComponent = (PanelPopup) c;
+        super.installUI(c);
+        installDefaults();
+        installComponents();
+        installListeners();
+    }
+
+    protected void installDefaults() {
+        headerBackground = UIManager.getColor("TabFramePopup.headerBackground");
+        headerButtonHoverBackground = UIManager.getColor("TabFramePopup.headerButtonHoverBackground");
+        headerButtonClickBackground = UIManager.getColor("TabFramePopup.headerButtonClickBackground");
+        headerFocusBackground = UIManager.getColor("TabFramePopup.headerFocusBackground");
+        headerButtonFocusHoverBackground = UIManager.getColor("TabFramePopup.headerButtonFocusHoverBackground");
+        headerButtonFocusClickBackground = UIManager.getColor("TabFramePopup.headerButtonFocusClickBackground");
+        accelerator = UIManager.getString("TabFramePopup.closeAccelerator");
+        popupComponent.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT)
+                      .put(KeyStroke.getKeyStroke(accelerator), accelerator);
+        popupComponent.getActionMap().put(accelerator, closeAction);
+        popupComponent.setLayout(new BorderLayout());
+    }
+
+    protected void installComponents() {
+        closeButton = createCloseButton();
+        label = createLabel();
+        header = createHeader();
+
+        JPanel headerContainer = new JPanel(new BorderLayout());
+        setHeaderBackground(false);
+        headerContainer.add(header, BorderLayout.CENTER);
+        headerContainer.setMinimumSize(UIManager.getDimension("TabFramePopup.minimumHeaderSize"));
+
+        content = new JPanel(new BorderLayout());
+        content.add(popupComponent.getContentPane(), BorderLayout.CENTER);
+
+        popupComponent.setLayout(new BorderLayout());
+        popupComponent.add(headerContainer, BorderLayout.NORTH);
+        popupComponent.add(content, BorderLayout.CENTER);
+
+        headerBorder = createBorder();
+        contentBorder = createBorder();
+        headerContainer.setBorder(headerBorder);
+        content.setBorder(contentBorder);
+    }
+
+    protected void installListeners() {
+        popupComponent.addPropertyChangeListener(this);
+        Toolkit.getDefaultToolkit().addAWTEventListener(this, AWTEvent.FOCUS_EVENT_MASK);
+        var frame = popupComponent.getTabFrame();
+        if (frame != null) {
+            frame.addPropertyChangeListener(this);
+        }
+    }
+
+    protected HeaderButton createCloseButton() {
+        var closeButton = new HeaderButton(UIManager.getIcon("TabFramePopup.close.icon"), this);
+        closeButton.setBorder(new EmptyBorder(4, 4, 4, 4));
+        closeButton.addActionListener(e -> popupComponent.close());
+        var tooltip = UIManager.getString("TabFramePopup.closeTooltipText");
+        closeButton.setToolTipText(tooltip);
+        return closeButton;
+    }
+
+    protected JLabel createLabel() {
+        var label = new JLabelUIResource(popupComponent.getTitle(), popupComponent.getIcon(), JLabel.LEFT);
+        label.setOpaque(false);
+        return label;
+    }
+
+    protected JPanel createHeader() {
+        var header = new JPanel();
+        header.setLayout(new BoxLayout(header, BoxLayout.X_AXIS));
+        header.add(Box.createHorizontalStrut(5));
+        header.add(label);
+        header.add(Box.createGlue());
+        header.add(closeButton);
+        header.add(Box.createHorizontalStrut(1));
+        header.setBorder(UIManager.getBorder("TabFramePopup.headerBorder"));
+        return header;
+    }
+
+    protected void setHeaderBackground(final boolean focus) {
+        closeButton.setFocus(focus);
+        if (header != null) {
+            header.setBackground(focus ? headerFocusBackground : headerBackground);
+        }
+        if (oldFocus != focus) {
+            if (header != null) {
+                header.repaint();
+            }
+            closeButton.repaint();
+            oldFocus = focus;
+        }
+    }
+
+    protected MutableLineBorder createBorder() {
+        var color = UIManager.getColor("TabFramePopup.borderColor");
+        return new MutableLineBorder.UIResource(0, 0, 0, 0, color);
+    }
+
+    @Override
+    public void uninstallUI(final JComponent c) {
+        super.uninstallUI(c);
+        uninstallComponents();
+        uninstallListeners();
+        popupComponent.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT)
+                      .remove(KeyStroke.getKeyStroke(accelerator));
+        popupComponent.getActionMap().remove(accelerator);
+        popupComponent = null;
+    }
+
+    protected void uninstallComponents() {
+        popupComponent.removeAll();
+    }
+
+    protected void uninstallListeners() {
+        popupComponent.removePropertyChangeListener(this);
+        Toolkit.getDefaultToolkit().removeAWTEventListener(this);
+        var frame = popupComponent.getTabFrame();
+        if (frame != null) {
+            frame.removePropertyChangeListener(this);
+        }
+    }
+
+    public final Dimension getPreferredSize(@NotNull final JComponent c) {
+        if (!c.isEnabled()) {
+            return new Dimension(0, 0);
+        } else {
+            return super.getPreferredSize(c);
+        }
+    }
+
+    @Override
+    public Dimension getMinimumSize(@NotNull final JComponent c) {
+        if (!c.isEnabled()) {
+            return new Dimension(0, 0);
+        } else {
+            return super.getMinimumSize(c);
+        }
+    }
+
+    @Override
+    public Dimension getMaximumSize(@NotNull final JComponent c) {
+        if (!c.isEnabled()) {
+            return new Dimension(0, 0);
+        } else {
+            return super.getMaximumSize(c);
+        }
+    }
+
+    @Override
+    public void propertyChange(@NotNull final PropertyChangeEvent evt) {
+        var key = evt.getPropertyName();
+        if ("open".equals(key)) {
+            if (Boolean.TRUE.equals(evt.getNewValue())) {
+                setHeaderBackground(true);
+            }
+        } else if ("content".equals(key)) {
+            if (content == null) return;
+            content.add((Component) evt.getNewValue(), BorderLayout.CENTER);
+            content.invalidate();
+        } else if ("title".equals(key)) {
+            if (label == null) return;
+            label.setText(evt.getNewValue().toString());
+            label.repaint();
+        } else if ("icon".equals(key)) {
+            if (label == null) return;
+            label.setIcon((Icon) evt.getNewValue());
+            label.repaint();
+        } else if ("visibleTab".equals(key)) {
+            if (evt.getNewValue() instanceof TabFrame.TabFramePosition) {
+                if (((TabFrame.TabFramePosition) evt.getNewValue()).getAlignment() == popupComponent.getAlignment()) {
+                    updateBorder(true);
+                }
+            }
+        } else if ("tabFrame".equals(key)) {
+            var oldVal = evt.getOldValue();
+            var newVal = evt.getNewValue();
+            if (oldVal instanceof TabFrame) {
+                ((TabFrame) oldVal).removePropertyChangeListener(this);
+            }
+            if (newVal instanceof TabFrame) {
+                ((TabFrame) newVal).addPropertyChangeListener(this);
+            }
+        } else if ("peerInsets".equals(key)) {
+            updateBorder(false);
+        }
+    }
+
+    protected void updateBorder(final boolean notifyPeer) {
+        if (popupComponent.getTabFrame() != null) {
+            var tabFrame = popupComponent.getTabFrame();
+            var status = tabFrame.getContentPane().getStatus();
+            var alignment = popupComponent.getAlignment();
+            var insets = getBorderSize(alignment, status);
+
+            applyBorderInsets(insets);
+            popupComponent.doLayout();
+            popupComponent.repaint();
+            if (notifyPeer) {
+                var peer = tabFrame.getPopupComponentAt(tabFrame.getPeer(popupComponent.getAlignment()));
+                peer.firePropertyChange("peerInsets", 0, 1);
+            }
+        }
+    }
+
+    @NotNull
+    protected Insets getBorderSize(@NotNull final Alignment a, final boolean[] info) {
+        var insets = new Insets(0, 0, 0, 0);
+        switch (a) {
+            case NORTH:
+            case NORTH_EAST:
+                if (info[Alignment.NORTH.getIndex()] || info[Alignment.NORTH_EAST.getIndex()]) {
+                    insets.bottom = 1;
+                }
+                if (info[Alignment.NORTH.getIndex()] && a == Alignment.NORTH_EAST) {
+                    insets.left = 1;
+                }
+                return insets;
+            case SOUTH:
+            case SOUTH_WEST:
+                if (info[Alignment.SOUTH_WEST.getIndex()] || info[Alignment.SOUTH.getIndex()]) {
+                    insets.top = 1;
+                }
+                if (info[Alignment.SOUTH_WEST.getIndex()] && a == Alignment.SOUTH) {
+                    insets.left = 1;
+                }
+                return insets;
+            case EAST:
+            case SOUTH_EAST:
+                if (info[Alignment.EAST.getIndex()] || info[Alignment.SOUTH_EAST.getIndex()]) {
+                    insets.left = 1;
+                }
+                if (info[Alignment.EAST.getIndex()] && a == Alignment.SOUTH_EAST) {
+                    insets.top = 1;
+                }
+                return insets;
+            case WEST:
+            case NORTH_WEST:
+                if (info[Alignment.NORTH_WEST.getIndex()] || info[Alignment.WEST.getIndex()]) {
+                    insets.right = 1;
+                }
+                if (info[Alignment.NORTH_WEST.getIndex()] && a == Alignment.WEST) {
+                    insets.top = 1;
+                }
+                return insets;
+            default:
+                return insets;
+        }
+    }
+
+    protected void applyBorderInsets(@NotNull final Insets insets) {
+        headerBorder.setInsets(insets.top, insets.left, 1, insets.right);
+        contentBorder.setInsets(0, insets.left, insets.bottom, insets.right);
+    }
+
+    protected boolean hasFocus() {
+        return oldFocus;
+    }
+
+    @Override
+    public void eventDispatched(@NotNull final AWTEvent event) {
+        if (event.getID() == FocusEvent.FOCUS_GAINED) {
+            boolean focus = DarkUIUtil.hasFocus(popupComponent);
+            setHeaderBackground(focus);
+        }
+    }
+
+    protected static final class HeaderButton extends JButton implements UIResource {
+
+        private final ToolTipContext context = new ToolTipContext(this);
+        private final DarkPanelPopupUI ui;
+
+        public HeaderButton(@NotNull final Icon icon, final DarkPanelPopupUI ui) {
+            super(icon);
+            this.ui = ui;
+            putClientProperty("JButton.buttonType", "square");
+            putClientProperty("JButton.forceRoundCorner", Boolean.TRUE);
+            putClientProperty("JButton.variant", "shadow");
+            setRolloverEnabled(true);
+            setFocus(false);
+            setOpaque(false);
+        }
+
+        public void setFocus(final boolean focus) {
+            putClientProperty("JButton.shadow.hover", focus ? ui.headerButtonFocusHoverBackground
+                                                            : ui.headerButtonHoverBackground);
+            putClientProperty("JButton.shadow.click", focus ? ui.headerButtonFocusClickBackground
+                                                            : ui.headerButtonClickBackground);
+        }
+
+        @Override
+        public Point getToolTipLocation(final MouseEvent event) {
+            return context.getToolTipLocation(event);
+        }
+
+        @Override
+        public JToolTip createToolTip() {
+            return context.getToolTip();
+        }
+    }
+}

src/main/java/com/weis/darklaf/ui/tabframe/DarkTabFramePopupHeaderBorder.java

@@ -0,0 +1,33 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.ui.tabframe;
+
+import javax.swing.plaf.BorderUIResource;
+
+public class DarkTabFramePopupHeaderBorder extends BorderUIResource.EmptyBorderUIResource {
+
+    public DarkTabFramePopupHeaderBorder() {
+        super(1, 0, 1, 0);
+    }
+}

src/main/java/com/weis/darklaf/ui/tabframe/DarkTabFrameTabBorder.java

@@ -0,0 +1,33 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.ui.tabframe;
+
+import javax.swing.plaf.BorderUIResource;
+
+public class DarkTabFrameTabBorder extends BorderUIResource.EmptyBorderUIResource {
+
+    public DarkTabFrameTabBorder() {
+        super(2, 5, 2, 5);
+    }
+}

src/main/java/com/weis/darklaf/ui/tabframe/DarkTabFrameTabContainerUI.java

@@ -0,0 +1,190 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.ui.tabframe;
+
+import com.weis.darklaf.components.tabframe.TabFrame;
+import com.weis.darklaf.components.tabframe.TabFrameTabContainer;
+import com.weis.darklaf.decorators.HoverListener;
+import com.weis.darklaf.ui.panel.DarkPanelUI;
+import com.weis.darklaf.util.DarkUIUtil;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+
+import javax.swing.*;
+import javax.swing.plaf.ComponentUI;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+
+public class DarkTabFrameTabContainerUI extends DarkPanelUI implements PropertyChangeListener {
+
+    protected TabFrameTabContainer tabContainer;
+    private final MouseListener mouseListener = new MouseAdapter() {
+        @Override
+        public void mousePressed(final MouseEvent e) {
+            if (SwingUtilities.isLeftMouseButton(e)) {
+                tabContainer.getTabFrame().toggleTab(tabContainer.getOrientation(), tabContainer.getIndex(),
+                                                     !tabContainer.isSelected());
+            }
+        }
+    };
+    private HoverListener hoverListener;
+    private Color selectedColor;
+    private Color hoverColor;
+
+    @NotNull
+    @Contract("_ -> new")
+    public static ComponentUI createUI(final JComponent c) {
+        return new DarkTabFrameTabContainerUI();
+    }
+
+    @Override
+    public void installUI(final JComponent c) {
+        tabContainer = (TabFrameTabContainer) c;
+        super.installUI(c);
+        installDefaults(tabContainer);
+        installListeners();
+        installAccelerator(tabContainer.getTabFrame());
+    }
+
+    protected void installListeners() {
+        hoverListener = new HoverListener(tabContainer);
+        tabContainer.addMouseListener(hoverListener);
+        tabContainer.addPropertyChangeListener(this);
+        tabContainer.addMouseListener(mouseListener);
+        var cont = tabContainer.getContent();
+        if (cont != null) {
+            cont.addMouseListener(hoverListener);
+            cont.addMouseListener(mouseListener);
+        }
+    }
+
+    protected void installAccelerator(final TabFrame tabFrame) {
+        if (tabFrame == null) return;
+        int acc = tabContainer.getAccelerator();
+        if (acc < 0) return;
+        tabFrame.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT)
+                .put(KeyStroke.getKeyStroke(UIManager.getString("TabFrame.acceleratorKeyCode") + " " + acc),
+                     "accelerator_" + acc);
+        tabFrame.getActionMap().put("accelerator_" + acc, createAcceleratorAction(tabFrame));
+    }
+
+    protected Action createAcceleratorAction(final TabFrame tabFrame) {
+        return new AbstractAction() {
+            @Override
+            public void actionPerformed(final ActionEvent e) {
+                var a = tabContainer.getOrientation();
+                var index = tabContainer.getIndex();
+                if (!tabContainer.isSelected()) {
+                    tabFrame.toggleTab(a, index, true);
+                } else {
+                    var popup = tabFrame.getPopupComponentAt(a, index);
+                    if (!DarkUIUtil.hasFocus(popup)) {
+                        popup.requestFocus();
+                    } else {
+                        tabFrame.toggleTab(a, index, false);
+                    }
+                }
+            }
+        };
+    }
+
+    @Override
+    public void uninstallUI(final JComponent c) {
+        super.uninstallUI(c);
+        tabContainer.removeMouseListener(hoverListener);
+        tabContainer.removeMouseListener(mouseListener);
+        tabContainer.removePropertyChangeListener(this);
+        var cont = tabContainer.getContent();
+        if (cont != null) {
+            cont.removeMouseListener(hoverListener);
+            cont.removeMouseListener(mouseListener);
+        }
+        hoverListener = null;
+        uninstallAccelerator(tabContainer.getTabFrame());
+        tabContainer = null;
+    }
+
+    protected void installDefaults(final JPanel p) {
+        super.installDefaults(p);
+        tabContainer.setOpaque(true);
+        selectedColor = UIManager.getColor("TabFrameTab.selectedBackground");
+        hoverColor = UIManager.getColor("TabFrameTab.hoverBackground");
+    }
+
+    protected void uninstallAccelerator(final TabFrame tabFrame) {
+        if (tabFrame == null) return;
+        int acc = tabContainer.getAccelerator();
+        String accAction = "accelerator_" + acc;
+        tabFrame.getActionMap().remove(accAction);
+    }
+
+    @Override
+    public void paint(@NotNull final Graphics g, @NotNull final JComponent c) {
+        g.setColor(getBackground(tabContainer));
+        g.fillRect(0, 0, c.getWidth(), c.getHeight());
+        super.paint(g, c);
+    }
+
+    public Color getBackground(@NotNull final TabFrameTabContainer tab) {
+        return tab.isSelected()
+               ? selectedColor
+               : hoverListener.isHover() ? hoverColor : tab.getBackground();
+    }
+
+    @Override
+    public void propertyChange(@NotNull final PropertyChangeEvent evt) {
+        var key = evt.getPropertyName();
+        if ("content".equals(key)) {
+            var oldVal = evt.getOldValue();
+            var newVal = evt.getNewValue();
+            if (oldVal instanceof Component) {
+                ((Component) oldVal).removeMouseListener(mouseListener);
+                ((Component) oldVal).removeMouseListener(hoverListener);
+            }
+            if (newVal instanceof Component) {
+                ((Component) newVal).addMouseListener(mouseListener);
+                ((Component) newVal).addMouseListener(hoverListener);
+            }
+        } else if ("selected".equals(key)) {
+            if (tabContainer == null) return;
+            tabContainer.repaint();
+        } else if ("accelerator".equals(key)) {
+            if (tabContainer == null) return;
+            uninstallAccelerator(tabContainer.getTabFrame());
+            installAccelerator(tabContainer.getTabFrame());
+        } else if ("tabFrame".equals(key)) {
+            if (evt.getOldValue() instanceof TabFrame) {
+                uninstallAccelerator((TabFrame) evt.getOldValue());
+            }
+            if (evt.getNewValue() instanceof TabFrame) {
+                installAccelerator((TabFrame) evt.getNewValue());
+            }
+        }
+    }
+}

src/main/java/com/weis/darklaf/ui/tabframe/DarkTabFrameTabLabelUI.java

@@ -0,0 +1,274 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.ui.tabframe;
+
+import com.weis.darklaf.components.alignment.Alignment;
+import com.weis.darklaf.components.tabframe.TabFrame;
+import com.weis.darklaf.components.tabframe.TabFrameTabLabel;
+import com.weis.darklaf.decorators.HoverListener;
+import com.weis.darklaf.icons.RotatableIcon;
+import com.weis.darklaf.ui.label.DarkLabelUI;
+import com.weis.darklaf.util.DarkUIUtil;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+import sun.swing.SwingUtilities2;
+
+import javax.swing.*;
+import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.basic.BasicHTML;
+import javax.swing.text.View;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+
+public class DarkTabFrameTabLabelUI extends DarkLabelUI implements PropertyChangeListener {
+
+    private TabFrameTabLabel tabComponent;
+    private final MouseListener mouseListener = new MouseAdapter() {
+        @Override
+        public void mousePressed(final MouseEvent e) {
+            if (SwingUtilities.isLeftMouseButton(e)) {
+                tabComponent.getTabFrame().toggleTab(tabComponent.getOrientation(), tabComponent.getIndex(),
+                                                     !tabComponent.isSelected());
+            }
+        }
+    };
+    private HoverListener hoverListener;
+    private Color defaultFontColor;
+    private Color selectedFontColor;
+    private Color selectedColor;
+    private Color hoverColor;
+    private RotatableIcon rotatableIcon = new RotatableIcon();
+    private Rectangle paintIconR = new Rectangle();
+    private Rectangle paintTextR = new Rectangle();
+
+    @NotNull
+    @Contract("_ -> new")
+    public static ComponentUI createUI(final JComponent c) {
+        return new DarkTabFrameTabLabelUI();
+    }
+
+    @Override
+    public void paint(@NotNull final Graphics g, final JComponent c) {
+        g.setColor(getBackground(tabComponent));
+        g.fillRect(0, 0, tabComponent.getWidth(), tabComponent.getHeight());
+
+        JLabel label = (JLabel) c;
+        String text = label.getText();
+        Icon icon = getIcon();
+
+        if ((icon == null) && (text == null)) {
+            return;
+        }
+
+        FontMetrics fm = SwingUtilities2.getFontMetrics(label, g);
+        String clippedText = layout(label, fm, c.getWidth(), c.getHeight());
+
+        if (icon != null) {
+            icon.paintIcon(c, g, paintIconR.x, paintIconR.y);
+        }
+
+        if (text != null) {
+            View v = (View) c.getClientProperty(BasicHTML.propertyKey);
+            if (v != null) {
+                v.paint(g, paintTextR);
+            } else {
+                int textX = paintTextR.x;
+                int textY = paintTextR.y + fm.getAscent();
+
+                if (label.isEnabled()) {
+                    paintEnabledText(label, g, clippedText, textX, textY);
+                } else {
+                    paintDisabledText(label, g, clippedText, textX, textY);
+                }
+            }
+        }
+    }
+
+    @Override
+    public void installUI(final JComponent c) {
+        tabComponent = (TabFrameTabLabel) c;
+        super.installUI(c);
+    }
+
+    @Override
+    public void uninstallUI(final JComponent c) {
+        super.uninstallUI(c);
+        uninstallAccelerator(tabComponent.getTabFrame());
+        tabComponent.removeMouseListener(hoverListener);
+        tabComponent.removeMouseListener(mouseListener);
+        hoverListener = null;
+        tabComponent = null;
+    }
+
+    @Override
+    protected void installDefaults(final JLabel c) {
+        super.installDefaults(c);
+        tabComponent.setFont(UIManager.getFont("TabFrameTab.font"));
+        tabComponent.setOpaque(true);
+        defaultFontColor = UIManager.getColor("TabFrameTab.foreground");
+        selectedColor = UIManager.getColor("TabFrameTab.selectedBackground");
+        hoverColor = UIManager.getColor("TabFrameTab.hoverBackground");
+        selectedFontColor = UIManager.getColor("TabFrameTab.selectedForeground");
+        LookAndFeel.installBorder(c, "TabFrameTab.border");
+    }
+
+    @Override
+    protected void installListeners(final JLabel c) {
+        super.installListeners(c);
+        hoverListener = new HoverListener(tabComponent);
+        tabComponent.addMouseListener(hoverListener);
+        tabComponent.addMouseListener(mouseListener);
+        installAccelerator(tabComponent.getTabFrame());
+    }
+
+    protected void installAccelerator(final TabFrame tabFrame) {
+        if (tabFrame == null) return;
+        int acc = tabComponent.getAccelerator();
+        if (acc < 0) return;
+        System.out.println("install");
+        tabFrame.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT)
+                .put(KeyStroke.getKeyStroke(UIManager.getString("TabFrame.acceleratorKeyCode") + " " + acc),
+                     "accelerator_" + acc);
+        tabFrame.getActionMap().put("accelerator_" + acc, createAcceleratorAction(tabFrame));
+    }
+
+    protected Action createAcceleratorAction(final TabFrame tabFrame) {
+        return new AbstractAction() {
+            @Override
+            public void actionPerformed(final ActionEvent e) {
+                var a = tabComponent.getOrientation();
+                var index = tabComponent.getIndex();
+                if (!tabComponent.isSelected()) {
+                    tabFrame.toggleTab(a, index, true);
+                } else {
+                    var popup = tabFrame.getPopupComponentAt(a, index);
+                    if (!DarkUIUtil.hasFocus(popup)) {
+                        popup.requestFocus();
+                    } else {
+                        tabFrame.toggleTab(a, index, false);
+                    }
+                }
+            }
+        };
+    }
+
+    @Override
+    public void propertyChange(final PropertyChangeEvent e) {
+        super.propertyChange(e);
+        var key = e.getPropertyName();
+        if ("selected".equals(key)) {
+            tabComponent.setForeground(Boolean.TRUE.equals(e.getNewValue())
+                                       ? selectedFontColor : defaultFontColor);
+            tabComponent.repaint();
+        } else if ("title".equals(key)) {
+            updateText();
+        } else if ("accelerator".equals(key)) {
+            updateText();
+            if (tabComponent == null) return;
+            uninstallAccelerator(tabComponent.getTabFrame());
+            installAccelerator(tabComponent.getTabFrame());
+        } else if ("orientation".equals(key)) {
+            rotatableIcon.setOrientation(mapOrientation(tabComponent.getOrientation()));
+        } else if ("tabFrame".equals(key)) {
+            if (e.getOldValue() instanceof TabFrame) {
+                uninstallAccelerator((TabFrame) e.getOldValue());
+            }
+            if (e.getNewValue() instanceof TabFrame) {
+                installAccelerator((TabFrame) e.getNewValue());
+            }
+        }
+    }
+
+    protected void updateText() {
+        var title = tabComponent.getTitle();
+        title = title == null ? "" : title;
+        int accelerator = tabComponent.getAccelerator();
+        if (accelerator >= 0 && accelerator <= 9) {
+            tabComponent.setText(accelerator + ":" + title);
+            tabComponent.setDisplayedMnemonicIndex(0);
+        } else {
+            tabComponent.setText(title);
+            tabComponent.setDisplayedMnemonicIndex(1);
+        }
+    }
+
+    protected void uninstallAccelerator(final TabFrame tabFrame) {
+        if (tabFrame == null) return;
+        int acc = tabComponent.getAccelerator();
+        String accAction = "accelerator_" + acc;
+        tabFrame.getActionMap().remove(accAction);
+    }
+
+    public Color getBackground(@NotNull final TabFrameTabLabel tab) {
+        return tab.isSelected()
+               ? selectedColor
+               : hoverListener.isHover() ? hoverColor : tab.getBackground();
+    }
+
+    protected Icon getIcon() {
+        Icon icon = (tabComponent.isEnabled()) ? tabComponent.getIcon() : tabComponent.getDisabledIcon();
+        rotatableIcon.setIcon(icon);
+        if (rotatableIcon.getOrientation() == null) {
+            rotatableIcon.setOrientation(mapOrientation(tabComponent.getOrientation()));
+        }
+        return rotatableIcon;
+    }
+
+    private String layout(@NotNull final JLabel label, final FontMetrics fm,
+                          final int width, final int height) {
+        Insets insets = label.getInsets(null);
+        String text = label.getText();
+        Rectangle paintViewR = new Rectangle();
+        paintViewR.x = insets.left;
+        paintViewR.y = insets.top;
+        paintViewR.width = width - (insets.left + insets.right);
+        paintViewR.height = height - (insets.top + insets.bottom);
+        paintIconR.x = paintIconR.y = paintIconR.width = paintIconR.height = 0;
+        paintTextR.x = paintTextR.y = paintTextR.width = paintTextR.height = 0;
+        return layoutCL(label, fm, text, getIcon(), paintViewR, paintIconR, paintTextR);
+    }
+
+    protected Alignment mapOrientation(@NotNull final Alignment newValue) {
+        switch (newValue) {
+            case CENTER:
+            case NORTH:
+            case NORTH_EAST:
+            case SOUTH:
+            case SOUTH_WEST:
+                return Alignment.NORTH;
+            case EAST:
+            case SOUTH_EAST:
+                return Alignment.WEST;
+            case WEST:
+            case NORTH_WEST:
+                return Alignment.EAST;
+        }
+        return Alignment.NORTH;
+    }
+}

src/main/java/com/weis/darklaf/ui/tabframe/DarkTabFrameUI.java

@@ -0,0 +1,188 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.ui.tabframe;
+
+import com.weis.darklaf.components.border.MutableLineBorder;
+import com.weis.darklaf.components.tabframe.PopupContainer;
+import com.weis.darklaf.components.tabframe.TabFrame;
+import com.weis.darklaf.components.tabframe.TabFramePopup;
+import com.weis.darklaf.components.tabframe.TabFrameUI;
+import com.weis.darklaf.util.DarkUIUtil;
+import org.jdesktop.jxlayer.JXLayer;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+import org.pbjar.jxlayer.plaf.ext.transform.DefaultTransformModel;
+import org.pbjar.jxlayer.plaf.ext.transform.TransformUtils;
+
+import javax.swing.*;
+import javax.swing.plaf.ComponentUI;
+import java.awt.*;
+import java.awt.event.AWTEventListener;
+import java.awt.event.MouseEvent;
+
+/**
+ * UI class for {@link TabFrame}.
+ *
+ * @author Jannis Weis
+ * @since 2018
+ */
+public class DarkTabFrameUI extends TabFrameUI implements AWTEventListener {
+
+    private TabFrame tabFrame;
+
+    private JXLayer<JComponent> rotatePaneLeft;
+    private JXLayer<JComponent> rotatePaneRight;
+
+    private LayoutManager layout;
+    private MutableLineBorder topBorder;
+    private MutableLineBorder bottomBorder;
+    private MutableLineBorder leftBorder;
+    private MutableLineBorder rightBorder;
+    private Color lineColor;
+
+    @NotNull
+    @Contract("_ -> new")
+    public static ComponentUI createUI(final JComponent c) {
+        return new DarkTabFrameUI();
+    }
+
+    @Override
+    public void installUI(@NotNull final JComponent c) {
+        tabFrame = (TabFrame) c;
+        installDefaults();
+        installComponents();
+        installListeners();
+    }
+
+    protected void installDefaults() {
+        layout = createLayout();
+        tabFrame.setLayout(layout);
+        lineColor = UIManager.getColor("TabFrame.line");
+        topBorder = new MutableLineBorder.UIResource(0, 0, 1, 0, lineColor);
+        bottomBorder = new MutableLineBorder.UIResource(1, 0, 0, 0, lineColor);
+        rightBorder = new MutableLineBorder.UIResource(0, 0, 1, 0, lineColor);
+        leftBorder = new MutableLineBorder.UIResource(0, 0, 1, 0, lineColor);
+
+        tabFrame.getTopTabContainer().setBorder(topBorder);
+        tabFrame.getBottomTabContainer().setBorder(bottomBorder);
+        tabFrame.getRightTabContainer().setBorder(rightBorder);
+        tabFrame.getLeftTabContainer().setBorder(leftBorder);
+    }
+
+    private void installComponents() {
+        DefaultTransformModel rightTransformModel = new DefaultTransformModel();
+        rightTransformModel.setQuadrantRotation(1);
+        rightTransformModel.setScaleToPreferredSize(true);
+        rotatePaneRight = TransformUtils.createTransformJXLayer(tabFrame.getRightTabContainer(), rightTransformModel);
+
+        DefaultTransformModel leftTransformModel = new DefaultTransformModel();
+        leftTransformModel.setQuadrantRotation(3);
+        leftTransformModel.setScaleToPreferredSize(true);
+        rotatePaneLeft = TransformUtils.createTransformJXLayer(tabFrame.getLeftTabContainer(), leftTransformModel);
+
+        tabFrame.add(tabFrame.getTopTabContainer());
+        tabFrame.add(tabFrame.getBottomTabContainer());
+        tabFrame.add(rotatePaneLeft);
+        tabFrame.add(rotatePaneRight);
+    }
+
+    protected void installListeners() {
+        Toolkit.getDefaultToolkit().addAWTEventListener(this, AWTEvent.MOUSE_EVENT_MASK);
+    }
+
+    protected LayoutManager createLayout() {
+        return new TabFrameLayout(tabFrame, this);
+    }
+
+    @Override
+    public void uninstallUI(final JComponent c) {
+        tabFrame.remove(tabFrame.getTopTabContainer());
+        tabFrame.remove(tabFrame.getBottomTabContainer());
+        tabFrame.remove(rotatePaneLeft);
+        tabFrame.remove(rotatePaneRight);
+        layout = null;
+        lineColor = null;
+        topBorder = null;
+        bottomBorder = null;
+        leftBorder = null;
+        rightBorder = null;
+        rotatePaneLeft = null;
+        rotatePaneRight = null;
+        uninstallListeners();
+    }
+
+    protected void uninstallListeners() {
+        Toolkit.getDefaultToolkit().removeAWTEventListener(this);
+    }
+
+    public void updateBorders(final int topCount, final int bottomCount,
+                              final int leftCount, final int rightCount) {
+        leftBorder.setRight(topCount > 0 ? 0 : 1);
+        leftBorder.setLeft(bottomCount > 0 ? 0 : 1);
+        rightBorder.setLeft(topCount > 0 ? 0 : 1);
+        rightBorder.setRight(bottomCount > 0 ? 0 : 1);
+    }
+
+    public int getTabSize(final TabFrame tabFrame) {
+        return UIManager.getInt("TabFrame.tabHeight");
+    }
+
+    public JComponent getLeftContainer() {
+        return rotatePaneLeft;
+    }
+
+    public JComponent getRightContainer() {
+        return rotatePaneRight;
+    }
+
+    public JComponent getTopContainer() {
+        return tabFrame.getTopTabContainer();
+    }
+
+    public JComponent getBottomContainer() {
+        return tabFrame.getBottomTabContainer();
+    }
+
+    @Override
+    public void eventDispatched(@NotNull final AWTEvent event) {
+        if (event.getID() == MouseEvent.MOUSE_PRESSED) {
+            var e = (MouseEvent) event;
+            var comp = e.getComponent().getComponentAt(e.getPoint());
+            var parent = DarkUIUtil.getParentOfType(TabFramePopup.class, comp);
+            if (parent != null) {
+                parent.getComponent().requestFocus();
+                return;
+            }
+            var parent2 = DarkUIUtil.getParentOfType(PopupContainer.class, comp);
+            if (parent2 != null) {
+                parent2.getPopup().requestFocus();
+                return;
+            }
+            var parent3 = DarkUIUtil.getParentOfType(TabFrame.class, comp);
+            if (parent3 != null && comp != null && !comp.hasFocus()) {
+                parent3.requestFocus();
+            }
+        }
+    }
+}

src/main/java/com/weis/darklaf/ui/tabframe/DarkTabbedPopupUI.java

@@ -0,0 +1,190 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.ui.tabframe;
+
+import com.weis.darklaf.components.JPanelUIResource;
+import com.weis.darklaf.components.border.MutableLineBorder;
+import com.weis.darklaf.components.tabframe.TabbedPopup;
+import com.weis.darklaf.ui.tabbedpane.DarkTabbedPaneUI;
+import com.weis.darklaf.ui.tabbedpane.NewTabButton;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+
+import javax.swing.*;
+import javax.swing.border.EmptyBorder;
+import javax.swing.plaf.ComponentUI;
+import java.awt.*;
+
+public class DarkTabbedPopupUI extends DarkPanelPopupUI {
+
+
+    protected Color headerHoverBackground;
+    protected Color headerSelectedBackground;
+    protected Color headerSelectedHoverBackground;
+    protected Color headerFocusHoverBackground;
+    protected Color headerFocusSelectedBackground;
+    protected Color headerFocusSelectedHoverBackground;
+    private TabbedPopup popupComponent;
+    private JTabbedPane tabbedPane;
+    private MutableLineBorder border;
+    private JPanel holder;
+
+    @NotNull
+    @Contract("_ -> new")
+    public static ComponentUI createUI(final JComponent c) {
+        return new DarkTabbedPopupUI();
+    }
+
+    @Override
+    public void installUI(final JComponent c) {
+        popupComponent = (TabbedPopup) c;
+        super.installUI(c);
+    }
+
+    @Override
+    protected void installDefaults() {
+        super.installDefaults();
+        headerHoverBackground = UIManager.getColor("TabFramePopup.headerHoverBackground");
+        headerSelectedBackground = UIManager.getColor("TabFramePopup.headerSelectedBackground");
+        headerSelectedHoverBackground = UIManager.getColor("TabFramePopup.headerSelectedHoverBackground");
+        headerFocusHoverBackground = UIManager.getColor("TabFramePopup.headerFocusHoverBackground");
+        headerFocusSelectedBackground = UIManager.getColor("TabFramePopup.headerFocusSelectedBackground");
+        headerFocusSelectedHoverBackground = UIManager.getColor("TabFramePopup.headerFocusSelectedHoverBackground");
+    }
+
+    @Override
+    protected void installComponents() {
+        closeButton = createCloseButton();
+        label = createLabel();
+        tabbedPane = createTabbedPane();
+        setupTabbedPane();
+        border = createBorder();
+        holder = new JPanel(new BorderLayout());
+        holder.add(tabbedPane, BorderLayout.CENTER);
+        holder.setBorder(border);
+        popupComponent.add(holder);
+    }
+
+    protected JTabbedPane createTabbedPane() {
+        var tabbedPane = popupComponent.getTabbedPane();
+        tabbedPane.setUI(new DarkTabFrameTabbedPaneUI());
+        tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);
+        return tabbedPane;
+    }
+
+    protected void setupTabbedPane() {
+        label.setBorder(new EmptyBorder(0, 5, 0, 5));
+        var buttonHolder = new JPanelUIResource();
+        buttonHolder.setLayout(new BoxLayout(buttonHolder, BoxLayout.X_AXIS));
+        buttonHolder.add(Box.createHorizontalStrut(1));
+        buttonHolder.add(closeButton);
+        buttonHolder.add(Box.createHorizontalStrut(1));
+        buttonHolder.setOpaque(false);
+        tabbedPane.setOpaque(false);
+        tabbedPane.putClientProperty("JTabbedPane.leadingComponent", label);
+        tabbedPane.putClientProperty("JTabbedPane.trailingComponent", buttonHolder);
+    }
+
+    @Override
+    protected void uninstallComponents() {
+        super.uninstallComponents();
+        popupComponent.remove(tabbedPane);
+    }
+
+    @Override
+    protected void applyBorderInsets(@NotNull final Insets insets) {
+        border.setInsets(insets.top, insets.left, insets.bottom, insets.right);
+    }
+
+    @Override
+    protected void setHeaderBackground(final boolean focus) {
+        var oldFocus = hasFocus();
+        super.setHeaderBackground(focus);
+        if (oldFocus != focus) {
+            holder.setBackground(focus ? headerFocusBackground : headerBackground);
+            holder.repaint();
+        }
+    }
+
+    protected class DarkTabFrameTabbedPaneUI extends DarkTabbedPaneUI {
+
+        protected Color getTabBackgroundColor(final int tabIndex, final boolean isSelected, final boolean hover) {
+            if (hasFocus()) {
+                if (isSelected) {
+                    return hover ? headerFocusSelectedHoverBackground
+                                 : headerFocusSelectedBackground;
+                } else {
+                    return hover ? headerFocusHoverBackground
+                                 : headerFocusBackground;
+                }
+            } else {
+                if (isSelected) {
+                    return hover ? headerSelectedHoverBackground
+                                 : headerSelectedBackground;
+                } else {
+                    return hover ? headerHoverBackground
+                                 : headerBackground;
+                }
+            }
+        }
+
+        @Override
+        protected Color getTabBorderColor() {
+            return UIManager.getColor("TabFramePopup.borderColor");
+        }
+
+        @Override
+        protected Color getAccentColor(final boolean focus) {
+            return super.getAccentColor(focus || hasFocus());
+        }
+
+        @Override
+        public JComponent createNewTabButton() {
+            return new TabFrameNewTabButton(this);
+        }
+
+        @Override
+        public JButton createMoreTabsButton() {
+            return super.createMoreTabsButton();
+        }
+    }
+
+    protected class TabFrameNewTabButton extends NewTabButton {
+
+        protected TabFrameNewTabButton(@NotNull final DarkTabbedPaneUI ui) {
+            super(ui);
+        }
+
+        @Override
+        protected JButton createButton() {
+            var button = new HeaderButton(ui.getNewTabIcon(), DarkTabbedPopupUI.this);
+            button.putClientProperty("JButton.variant", "shadow");
+            button.putClientProperty("JButton.buttonType", "square");
+            button.putClientProperty("JButton.thin", Boolean.TRUE);
+            button.setRolloverEnabled(true);
+            button.setOpaque(false);
+            return button;
+        }
+    }
+}

src/main/java/com/weis/darklaf/ui/tabframe/TabFrameLayout.java

@@ -0,0 +1,229 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.weis.darklaf.ui.tabframe;
+
+import com.weis.darklaf.components.alignment.Alignment;
+import com.weis.darklaf.components.tabframe.TabFrame;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+
+import java.awt.*;
+
+/**
+ * @author Jannis Weis
+ * @since 2019
+ */
+public class TabFrameLayout implements LayoutManager {
+
+    private final TabFrame tabFrame;
+    private DarkTabFrameUI ui;
+    private int maxTabHeight;
+    private int maxTabWidth;
+
+    @Contract(pure = true)
+    public TabFrameLayout(@NotNull final TabFrame tabFrame, final DarkTabFrameUI ui) {
+        this.tabFrame = tabFrame;
+        this.ui = ui;
+    }
+
+    @Override
+    public void addLayoutComponent(final String name, final Component comp) {
+    }
+
+    @Override
+    public void removeLayoutComponent(final Component comp) {
+    }
+
+    @NotNull
+    @Override
+    public Dimension preferredLayoutSize(final Container parent) {
+        var b = tabFrame.getContentPane().getComponent().getPreferredSize();
+        return new Dimension(tabFrame.getLeftTabContainer().getWidth()
+                                     + tabFrame.getRightTabContainer().getWidth() + b.width,
+                             tabFrame.getTopTabContainer().getHeight()
+                                     + tabFrame.getBottomTabContainer().getHeight() + b.height);
+    }
+
+    @NotNull
+    @Override
+    public Dimension minimumLayoutSize(final Container parent) {
+        var b = tabFrame.getContentPane().getComponent().getMinimumSize();
+        return new Dimension(tabFrame.getLeftTabContainer().getWidth()
+                                     + tabFrame.getRightTabContainer().getWidth() + b.width,
+                             tabFrame.getTopTabContainer().getHeight()
+                                     + tabFrame.getBottomTabContainer().getHeight() + b.height);
+    }
+
+    @Override
+    public void layoutContainer(@NotNull final Container parent) {
+        var dim = parent.getSize();
+        int topSize = tabFrame.getTopTabCount();
+        int bottomSize = tabFrame.getBottomTabCount();
+        int leftSize = tabFrame.getLeftTabCount();
+        int rightSize = tabFrame.getRightTabCount();
+        layoutTopTab(dim, topSize, leftSize, rightSize);
+        layoutBottomTab(dim, bottomSize, leftSize, rightSize);
+        layoutLeftTab(dim, leftSize);
+        layoutRightTab(dim, rightSize);
+
+        ui.updateBorders(topSize, bottomSize, leftSize, rightSize);
+
+        var leftPane = ui.getLeftContainer();
+        var rightPane = ui.getRightContainer();
+        var topPane = ui.getTopContainer();
+        var bottomPane = ui.getBottomContainer();
+        tabFrame.getContentPane().getComponent().setBounds(leftPane.getWidth(), topPane.getHeight(),
+                                                           dim.width - leftPane.getWidth() - rightPane.getWidth(),
+                                                           dim.height - topPane.getHeight() - bottomPane.getHeight());
+    }
+
+    protected void layoutTopTab(final Dimension dim, final int topSize, final int leftSize, final int rightSize) {
+        if (topSize > 0) {
+            tabFrame.getTopTabContainer().setBounds(0, 0, dim.width, tabFrame.getTabSize());
+            layoutHorizontal(dim, Alignment.NORTH, Alignment.NORTH_EAST, 0, leftSize, rightSize);
+        } else {
+            tabFrame.getTopTabContainer().setBounds(0, 0, 0, 0);
+        }
+    }
+
+    protected void layoutBottomTab(final Dimension dim, final int bottomSize, final int leftSize, final int rightSize) {
+        if (bottomSize > 0) {
+            int size = tabFrame.getTabSize();
+            tabFrame.getBottomTabContainer().setBounds(0, dim.height - size, dim.width, size);
+            layoutHorizontal(dim, Alignment.SOUTH_WEST, Alignment.SOUTH, 1, leftSize, rightSize);
+        } else {
+            tabFrame.getBottomTabContainer().setBounds(0, 0, 0, 0);
+        }
+    }
+
+    protected void layoutHorizontal(final Dimension dim, final Alignment left, final Alignment right,
+                                    final int yOff, final int leftSize, final int rightSize) {
+        int tabHeight = calculateMaxTabSize(left);
+        var start = new Point(leftSize > 0 ? tabHeight : 0, yOff);
+        int leftEnd = layoutTabArea(start, left, true, tabHeight - 1);
+        start.x = rightSize > 0 ? dim.width - tabHeight : dim.width;
+        int rightStart = layoutTabArea(start, right, false, tabHeight - 1);
+        if (rightStart < leftEnd) {
+            shift(leftEnd - rightStart, right);
+        }
+    }
+
+    protected void layoutLeftTab(final Dimension dim, final int leftSize) {
+        var leftPane = ui.getLeftContainer();
+        var topPane = tabFrame.getTopTabContainer();
+        var bottomPane = tabFrame.getBottomTabContainer();
+        int tabWidth = calculateMaxTabSize(Alignment.WEST);
+        if (leftSize > 0) {
+            int height = dim.height - topPane.getHeight() - bottomPane.getHeight();
+            leftPane.setBounds(0, topPane.getHeight(), tabWidth, height + (height % 2));
+            tabFrame.getLeftTabContainer().setPreferredSize(new Dimension(leftPane.getHeight(),
+                                                                          leftPane.getWidth()));
+            tabFrame.getLeftTabContainer().setSize(tabFrame.getLeftTabContainer().getPreferredSize());
+            var start = new Point(leftPane.getHeight(), 0);
+            int topStart = layoutTabArea(start, Alignment.NORTH_WEST, false, tabWidth - 1);
+            start.x = 0;
+            int bottomEnd = layoutTabArea(start, Alignment.WEST, true, tabWidth - 1);
+            if (bottomEnd > topStart) {
+                shift(topStart - bottomEnd, Alignment.WEST);
+            }
+        } else {
+            tabFrame.getLeftTabContainer().setBounds(0, 0, 0, 0);
+            leftPane.setBounds(0, 0, 0, 0);
+        }
+    }
+
+    protected void layoutRightTab(final Dimension dim, final int rightSize) {
+        var rightPane = ui.getRightContainer();
+        var topPane = tabFrame.getTopTabContainer();
+        var bottomPane = tabFrame.getBottomTabContainer();
+        int tabWidth = calculateMaxTabSize(Alignment.EAST);
+        if (rightSize > 0) {
+            int height = dim.height - topPane.getHeight() - bottomPane.getHeight();
+            rightPane.setBounds(dim.width - tabWidth, topPane.getHeight(), tabWidth, height + (height % 2));
+            tabFrame.getRightTabContainer().setPreferredSize(new Dimension(rightPane.getHeight(), rightPane.getWidth()));
+            tabFrame.getRightTabContainer().setSize(tabFrame.getRightTabContainer().getPreferredSize());
+            var start = new Point(0, 0);
+            int topEnd = layoutTabArea(start, Alignment.EAST, true, tabWidth - 1);
+            start.x = tabFrame.getRightTabContainer().getWidth();
+            var bottomStart = layoutTabArea(start, Alignment.SOUTH_EAST, false, tabWidth - 1);
+            if (bottomStart < topEnd) {
+                shift(topEnd - bottomStart, Alignment.SOUTH_EAST);
+            }
+        } else {
+            tabFrame.getRightTabContainer().setBounds(0, 0, 0, 0);
+            topPane.setBounds(0, 0, 0, 0);
+        }
+    }
+
+    protected void shift(final int shift, final Alignment a) {
+        for (var c : tabFrame.tabsForAlignment(a)) {
+            var pos = c.getComponent().getLocation();
+            pos.x += shift;
+            c.getComponent().setLocation(pos);
+        }
+    }
+
+    protected int layoutTabArea(@NotNull final Point start, @NotNull final Alignment a,
+                                final boolean forward, final int size) {
+        int x = start.x;
+        int y = start.y;
+        var bounds = new Rectangle(0, 0, 0, 0);
+        for (var c : tabFrame.tabsForAlignment(a)) {
+            bounds.width = getTabWidth(c.getComponent());
+            bounds.height = size;
+            if (forward) {
+                bounds.x = x;
+                bounds.y = y;
+                x += bounds.width;
+            } else {
+                x -= bounds.width;
+                bounds.x = x;
+                bounds.y = y;
+            }
+            c.getComponent().setBounds(bounds);
+        }
+        return x;
+    }
+
+    protected int getTabWidth(@NotNull final Component c) {
+        int maxWidth = tabFrame.getMaxTabWidth();
+        int width = c.getPreferredSize().width;
+        if (maxWidth < 0) {
+            return width;
+        } else {
+            return Math.min(maxWidth, width);
+        }
+    }
+
+    protected int calculateMaxTabSize(final Alignment a) {
+        int max = tabFrame.getTabSize();
+        for (var c : tabFrame.tabsForAlignment(a)) {
+            max = Math.max(max, c.getComponent().getMaximumSize().height + 1);
+        }
+        for (var c : tabFrame.tabsForAlignment(tabFrame.getPeer(a))) {
+            max = Math.max(max, c.getComponent().getMaximumSize().height + 1);
+        }
+        return max;
+    }
+}

src/main/java/com/weis/darklaf/ui/table/DarkTableCellEditor.java

@@ -197,7 +197,7 @@ public class DarkTableCellEditor extends DefaultCellEditor {
             ((JComboBox<?>) editorComponent).setSelectedItem(value);
         } else if (editorComponent instanceof JSpinner) {
             var rendererComp = table.getCellRenderer(row, column)
-                    .getTableCellRendererComponent(table, value, isSelected, false, row, column);
+                                    .getTableCellRendererComponent(table, value, isSelected, false, row, column);
             if (rendererComp instanceof JTextField) {
                 editorComponent.putClientProperty("JSpinner.cellEditorAlignment",
                                                   ((JTextField) rendererComp).getHorizontalAlignment());

src/main/java/com/weis/darklaf/ui/table/DarkTableHeaderUIBridge.java

@@ -115,17 +115,8 @@ public class DarkTableHeaderUIBridge extends BasicTableHeaderUI {
                 rolloverColumnUpdated(oldRolloverColumn, rolloverColumn);
             }
         }
-    }    /**
-     * Creates the mouse listener for the {@code JTableHeader}.
-     *
-     * @return the mouse listener for the {@code JTableHeader}
-     */
-    protected MouseInputListener createMouseInputListener() {
-        return new DarkTableHeaderUIBridge.MouseInputHandler();
     }
 
-//  Installation
-
     //
 // Support for keyboard and mouse access
 //
@@ -138,28 +129,25 @@ public class DarkTableHeaderUIBridge extends BasicTableHeaderUI {
             }
         }
         return newIndex;
-    }    public void installUI(final JComponent c) {
-        super.installUI(c);
     }
 
+    /**
+     * Creates the mouse listener for the {@code JTableHeader}.
+     *
+     * @return the mouse listener for the {@code JTableHeader}
+     */
+    protected MouseInputListener createMouseInputListener() {
+        return new DarkTableHeaderUIBridge.MouseInputHandler();
+    }
+
+//  Installation
+
     protected int getSelectedColumnIndex() {
         int numCols = header.getColumnModel().getColumnCount();
         if (selectedColumnIndex >= numCols && numCols > 0) {
             selectedColumnIndex = numCols - 1;
         }
         return selectedColumnIndex;
-    }    /**
-     * Initializes JTableHeader properties such as font, foreground, and background.
-     * The font, foreground, and background properties are only set if their
-     * current value is either null or a UIResource, other properties are set
-     * if the current value is null.
-     *
-     * @see #installUI
-     */
-    protected void installDefaults() {
-        LookAndFeel.installColorsAndFont(header, "TableHeader.background",
-                                         "TableHeader.foreground", "TableHeader.font");
-        LookAndFeel.installProperty(header, "opaque", Boolean.TRUE);
     }
 
     /**
@@ -168,18 +156,11 @@ public class DarkTableHeaderUIBridge extends BasicTableHeaderUI {
      */
     void selectColumn(final int newColIndex) {
         selectColumn(newColIndex, true);
-    }    /**
-     * Attaches listeners to the JTableHeader.
-     */
-    protected void installListeners() {
-        mouseInputListener = createMouseInputListener();
-
-        header.addMouseListener(mouseInputListener);
-        header.addMouseMotionListener(mouseInputListener);
-        header.addFocusListener(focusListener);
     }
 
-// Uninstall methods
+    public void installUI(final JComponent c) {
+        super.installUI(c);
+    }
 
     void selectColumn(final int newColIndex, final boolean doScroll) {
         Rectangle repaintRect = header.getHeaderRect(selectedColumnIndex);
@@ -190,14 +171,6 @@ public class DarkTableHeaderUIBridge extends BasicTableHeaderUI {
         if (doScroll) {
             scrollToColumn(newColIndex);
         }
-    }    public void uninstallUI(final JComponent c) {
-        uninstallDefaults();
-        uninstallListeners();
-        uninstallKeyboardActions();
-
-        header.remove(rendererPane);
-        rendererPane = null;
-        header = null;
     }
 
     /**
@@ -223,9 +196,17 @@ public class DarkTableHeaderUIBridge extends BasicTableHeaderUI {
         vis.width = cellBounds.width;
         table.scrollRectToVisible(vis);
     }    /**
-     * Uninstalls default properties
+     * Initializes JTableHeader properties such as font, foreground, and background.
+     * The font, foreground, and background properties are only set if their
+     * current value is either null or a UIResource, other properties are set
+     * if the current value is null.
+     *
+     * @see #installUI
      */
-    protected void uninstallDefaults() {
+    protected void installDefaults() {
+        LookAndFeel.installColorsAndFont(header, "TableHeader.background",
+                                         "TableHeader.foreground", "TableHeader.font");
+        LookAndFeel.installProperty(header, "opaque", Boolean.TRUE);
     }
 
     protected int selectPreviousColumn(final boolean doIt) {
@@ -237,15 +218,6 @@ public class DarkTableHeaderUIBridge extends BasicTableHeaderUI {
             }
         }
         return newIndex;
-    }    /**
-     * Unregisters listeners.
-     */
-    protected void uninstallListeners() {
-        header.removeMouseListener(mouseInputListener);
-        header.removeMouseMotionListener(mouseInputListener);
-        header.removeFocusListener(focusListener);
-
-        mouseInputListener = null;
     }
 
     protected int changeColumnWidth(final TableColumn resizingColumn,
@@ -290,16 +262,17 @@ public class DarkTableHeaderUIBridge extends BasicTableHeaderUI {
         }
         return 0;
     }    /**
-     * Unregisters default key actions.
+     * Attaches listeners to the JTableHeader.
      */
-    protected void uninstallKeyboardActions() {
-        SwingUtilities.replaceUIInputMap(header, JComponent.WHEN_FOCUSED, null);
-        SwingUtilities.replaceUIActionMap(header, null);
+    protected void installListeners() {
+        mouseInputListener = createMouseInputListener();
+
+        header.addMouseListener(mouseInputListener);
+        header.addMouseMotionListener(mouseInputListener);
+        header.addFocusListener(focusListener);
     }
 
-//
-// Support for mouse rollover
-//
+// Uninstall methods
 
     protected static class Actions extends UIAction {
         public static final String TOGGLE_SORT_ORDER =
@@ -446,17 +419,6 @@ public class DarkTableHeaderUIBridge extends BasicTableHeaderUI {
 
             ui.changeColumnWidth(resizingColumn, th, oldWidth, newWidth);
         }
-    }    /**
-     * Returns the index of the column header over which the mouse
-     * currently is. When the mouse is not over the table header,
-     * -1 is returned.
-     *
-     * @return the index of the current rollover column
-     * @see #rolloverColumnUpdated(int, int)
-     * @since 1.6
-     */
-    protected int getRolloverColumn() {
-        return rolloverColumn;
     }
 
     /**
@@ -659,7 +621,66 @@ public class DarkTableHeaderUIBridge extends BasicTableHeaderUI {
                 header.getColumnModel().moveColumn(column, column);
             }
         }
-    }    /**
+    }
+
+    public void uninstallUI(final JComponent c) {
+        uninstallDefaults();
+        uninstallListeners();
+        uninstallKeyboardActions();
+
+        header.remove(rendererPane);
+        rendererPane = null;
+        header = null;
+    }
+
+
+    /**
+     * Uninstalls default properties
+     */
+    protected void uninstallDefaults() {
+    }
+
+
+    /**
+     * Unregisters listeners.
+     */
+    protected void uninstallListeners() {
+        header.removeMouseListener(mouseInputListener);
+        header.removeMouseMotionListener(mouseInputListener);
+        header.removeFocusListener(focusListener);
+
+        mouseInputListener = null;
+    }
+
+
+    /**
+     * Unregisters default key actions.
+     */
+    protected void uninstallKeyboardActions() {
+        SwingUtilities.replaceUIInputMap(header, JComponent.WHEN_FOCUSED, null);
+        SwingUtilities.replaceUIActionMap(header, null);
+    }
+
+//
+// Support for mouse rollover
+//
+
+
+    /**
+     * Returns the index of the column header over which the mouse
+     * currently is. When the mouse is not over the table header,
+     * -1 is returned.
+     *
+     * @return the index of the current rollover column
+     * @see #rolloverColumnUpdated(int, int)
+     * @since 1.6
+     */
+    protected int getRolloverColumn() {
+        return rolloverColumn;
+    }
+
+
+    /**
      * This method gets called every time when a rollover column in the table
      * header is updated. Every look and feel that supports a rollover effect
      * in a table header should override this method and repaint the header.

src/main/java/com/weis/darklaf/ui/table/DarkTableUI.java

@@ -249,6 +249,56 @@ public class DarkTableUI extends DarkTableUIBridge {
         return dist;
     }
 
+    @Override
+    protected void paintCell(final Graphics g, final Rectangle cellRect, final int row, final int column) {
+        var bounds = table.getVisibleRect();
+        Point upperLeft = bounds.getLocation();
+        Point lowerRight = new Point(upperLeft.x + bounds.width - 1, upperLeft.y + bounds.height - 1);
+        int cMin = table.columnAtPoint(upperLeft);
+        int cMax = table.columnAtPoint(lowerRight);
+
+        boolean scrollLtR = !isScrollPaneRtl();
+        boolean ltr = table.getComponentOrientation().isLeftToRight();
+        int draggedIndex = viewIndexForColumn(table.getTableHeader().getDraggedColumn());
+        int dist = adjustDistance(table.getTableHeader().getDraggedDistance(),
+                                  table.getCellRect(row, draggedIndex, true),
+                                  table);
+        boolean isDragged = column == draggedIndex && dist != 0;
+        var r = new Rectangle(cellRect);
+        if (!scrollBarVisible()) {
+            if (ltr) {
+                if (column == cMax && !isDragged) r.width += 1;
+            } else {
+                if (column == cMin && !isDragged) r.width += 1;
+            }
+        } else if (!scrollLtR) {
+            if (ltr) {
+                if (column == cMax && !isDragged) r.width += 1;
+                if (column == cMin && !isDragged) {
+                    r.width -= 1;
+                    r.x += 1;
+                }
+            } else {
+                if (column == cMin && !isDragged) r.width += 1;
+                if (column == cMax && !isDragged) {
+                    r.width -= 1;
+                    r.x += 1;
+                }
+            }
+        }
+        if (table.isEditing() && table.getEditingRow() == row &&
+                table.getEditingColumn() == column) {
+            Component component = table.getEditorComponent();
+            component.setBounds(cellRect);
+            component.validate();
+        } else {
+            TableCellRenderer renderer = table.getCellRenderer(row, column);
+            Component component = table.prepareRenderer(renderer, row, column);
+            rendererPane.paintComponent(g, component, table, cellRect.x, cellRect.y,
+                                        cellRect.width, cellRect.height, true);
+        }
+    }
+
     @Override
     protected void paintDraggedArea(@NotNull final Graphics g, final int rMin, final int rMax,
                                     final int cMin, final int cMax,
@@ -337,54 +387,4 @@ public class DarkTableUI extends DarkTableUIBridge {
             g.fillRect(rect.x, y, rect.width, 1);
         }
     }
-
-    @Override
-    protected void paintCell(final Graphics g, final Rectangle cellRect, final int row, final int column) {
-        var bounds = table.getVisibleRect();
-        Point upperLeft = bounds.getLocation();
-        Point lowerRight = new Point(upperLeft.x + bounds.width - 1, upperLeft.y + bounds.height - 1);
-        int cMin = table.columnAtPoint(upperLeft);
-        int cMax = table.columnAtPoint(lowerRight);
-
-        boolean scrollLtR = !isScrollPaneRtl();
-        boolean ltr = table.getComponentOrientation().isLeftToRight();
-        int draggedIndex = viewIndexForColumn(table.getTableHeader().getDraggedColumn());
-        int dist = adjustDistance(table.getTableHeader().getDraggedDistance(),
-                                  table.getCellRect(row, draggedIndex, true),
-                                  table);
-        boolean isDragged = column == draggedIndex && dist != 0;
-        var r = new Rectangle(cellRect);
-        if (!scrollBarVisible()) {
-            if (ltr) {
-                if (column == cMax && !isDragged) r.width += 1;
-            } else {
-                if (column == cMin && !isDragged) r.width += 1;
-            }
-        } else if (!scrollLtR) {
-            if (ltr) {
-                if (column == cMax && !isDragged) r.width += 1;
-                if (column == cMin && !isDragged) {
-                    r.width -= 1;
-                    r.x += 1;
-                }
-            } else {
-                if (column == cMin && !isDragged) r.width += 1;
-                if (column == cMax && !isDragged) {
-                    r.width -= 1;
-                    r.x += 1;
-                }
-            }
-        }
-        if (table.isEditing() && table.getEditingRow() == row &&
-                table.getEditingColumn() == column) {
-            Component component = table.getEditorComponent();
-            component.setBounds(cellRect);
-            component.validate();
-        } else {
-            TableCellRenderer renderer = table.getCellRenderer(row, column);
-            Component component = table.prepareRenderer(renderer, row, column);
-            rendererPane.paintComponent(g, component, table, cellRect.x, cellRect.y,
-                                        cellRect.width, cellRect.height, true);
-        }
-    }
 }

src/main/java/com/weis/darklaf/ui/text/DarkCaret.java

@@ -46,33 +46,17 @@ public class DarkCaret extends DefaultCaret implements UIResource {
 
     public boolean getRoundedSelectionEdges() {
         return ((DarkHighlightPainter) getSelectionPainter()).getRoundedEdges();
-    }    @Override
-    protected void positionCaret(final MouseEvent e) {
-        super.positionCaret(e);
     }
 
     public void setRoundedSelectionEdges(final boolean rounded) {
         ((DarkHighlightPainter) getSelectionPainter()).setRoundedEdges(rounded);
-    }    private void adjustCaretLocation(@NotNull final MouseEvent e) {
-        if (e.isShiftDown() && getDot() != -1) {
-            moveCaret(e);
-        } else {
-            positionCaret(e);
-        }
+    }    @Override
+    protected void positionCaret(final MouseEvent e) {
+        super.positionCaret(e);
     }
 
     public CaretStyle getStyle() {
         return style;
-    }    private void adjustFocus(final boolean inWindow) {
-        JTextComponent textArea = getComponent();
-        if ((textArea != null) && textArea.isEnabled() &&
-                textArea.isRequestFocusEnabled()) {
-            if (inWindow) {
-                textArea.requestFocusInWindow();
-            } else {
-                textArea.requestFocus();
-            }
-        }
     }
 
     public void setStyle(final CaretStyle style) {
@@ -84,22 +68,18 @@ public class DarkCaret extends DefaultCaret implements UIResource {
             this.style = s;
             repaint();
         }
-    }    @Override
-    protected synchronized void damage(final Rectangle r) {
-        if (r != null) {
-            validateWidth(r); // Check for "0" or "1" caret width
-            x = r.x - 1;
-            y = r.y;
-            width = r.width + 4;
-            height = r.height;
-            repaint();
+    }
+
+    private void adjustCaretLocation(@NotNull final MouseEvent e) {
+        if (e.isShiftDown() && getDot() != -1) {
+            moveCaret(e);
+        } else {
+            positionCaret(e);
         }
     }
 
     public boolean isAlwaysVisible() {
         return alwaysVisible;
-    }    public boolean getPasteOnMiddleMouseClick() {
-        return pasteOnMiddleMouseClick;
     }
 
     /**
@@ -122,15 +102,46 @@ public class DarkCaret extends DefaultCaret implements UIResource {
         }
     }
 
+    private void adjustFocus(final boolean inWindow) {
+        JTextComponent textArea = getComponent();
+        if ((textArea != null) && textArea.isEnabled() &&
+                textArea.isRequestFocusEnabled()) {
+            if (inWindow) {
+                textArea.requestFocusInWindow();
+            } else {
+                textArea.requestFocus();
+            }
+        }
+    }
+
+    @Override
+    protected synchronized void damage(final Rectangle r) {
+        if (r != null) {
+            validateWidth(r); // Check for "0" or "1" caret width
+            x = r.x - 1;
+            y = r.y;
+            width = r.width + 4;
+            height = r.height;
+            repaint();
+        }
+    }
+
+    @Override
+    protected Highlighter.HighlightPainter getSelectionPainter() {
+        return selectionPainter;
+    }
+
+    public boolean getPasteOnMiddleMouseClick() {
+        return pasteOnMiddleMouseClick;
+    }
+
+
     public enum CaretStyle {
         VERTICAL_LINE_STYLE,
         UNDERLINE_STYLE,
         BLOCK_STYLE,
         BLOCK_BORDER_STYLE,
         THICK_VERTICAL_LINE_STYLE
-    }    @Override
-    protected Highlighter.HighlightPainter getSelectionPainter() {
-        return selectionPainter;
     }
 
 

src/main/java/com/weis/darklaf/ui/text/DarkTextFieldUI.java

@@ -44,6 +44,14 @@ public class DarkTextFieldUI extends DarkTextFieldUIBridge implements PropertyCh
             getComponent().repaint();
         }
     };
+    private long lastSearchEvent;
+    private final PopupMenuListener searchPopupListener = new PopupMenuAdapter() {
+        @Override
+        public void popupMenuWillBecomeInvisible(@NotNull final PopupMenuEvent e) {
+            lastSearchEvent = System.currentTimeMillis();
+        }
+    };
+    private boolean clearHovered;
     private final MouseMotionListener mouseMotionListener = (MouseMovementListener) e -> updateCursor(e.getPoint());
     private final KeyListener keyListener = new KeyAdapter() {
         @Override
@@ -55,7 +63,6 @@ public class DarkTextFieldUI extends DarkTextFieldUIBridge implements PropertyCh
             });
         }
     };
-    private long lastSearchEvent;
     private final MouseListener mouseListener = (MouseClickListener) e -> {
         ClickAction actionUnder = getActionUnder(e.getPoint());
         if (actionUnder == ClickAction.CLEAR) {
@@ -64,13 +71,6 @@ public class DarkTextFieldUI extends DarkTextFieldUIBridge implements PropertyCh
             showSearchPopup();
         }
     };
-    private final PopupMenuListener searchPopupListener = new PopupMenuAdapter() {
-        @Override
-        public void popupMenuWillBecomeInvisible(@NotNull final PopupMenuEvent e) {
-            lastSearchEvent = System.currentTimeMillis();
-        }
-    };
-    private boolean clearHovered;
 
     @NotNull
     @Contract("_ -> new")

src/main/java/com/weis/darklaf/ui/text/DarkTextPaneUI.java

@@ -23,11 +23,6 @@ public class DarkTextPaneUI extends DarkEditorPaneUI {
      * Implementation of BasicEditorPaneUI
      */
 
-    @Override
-    protected String getPropertyPrefix() {
-        return "TextPane";
-    }
-
     @Override
     public void installUI(final JComponent c) {
         super.installUI(c);
@@ -37,4 +32,9 @@ public class DarkTextPaneUI extends DarkEditorPaneUI {
     protected void propertyChange(final PropertyChangeEvent evt) {
         super.propertyChange(evt);
     }
+
+    @Override
+    protected String getPropertyPrefix() {
+        return "TextPane";
+    }
 }

src/main/java/com/weis/darklaf/util/DarkUIUtil.java

@@ -209,10 +209,6 @@ public final class DarkUIUtil {
         return SwingUtilities.getWindowAncestor(owner) == w;
     }
 
-    public static Color getTreeTextBackground() {
-        return UIManager.getColor("Tree.textBackground");
-    }
-
     public static int getFocusAcceleratorKeyMask() {
         Toolkit tk = Toolkit.getDefaultToolkit();
         if (tk instanceof SunToolkit) {

src/main/java/org/pbjar/jxlayer/plaf/ext/MouseEventUI.java

@@ -0,0 +1,489 @@
+/*
+  Copyright (c) 2009, Piet Blok
+  All rights reserved.
+  <p>
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+  <p>
+  * Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+  * Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the following
+  disclaimer in the documentation and/or other materials provided
+  with the distribution.
+  * Neither the name of the copyright holder nor the names of the
+  contributors may be used to endorse or promote products derived
+  from this software without specific prior written permission.
+  <p>
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.pbjar.jxlayer.plaf.ext;
+
+import org.jdesktop.jxlayer.JXLayer;
+import org.jdesktop.jxlayer.plaf.AbstractLayerUI;
+import org.jdesktop.jxlayer.plaf.LayerUI;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import javax.swing.*;
+import javax.swing.plaf.ComponentUI;
+import java.awt.*;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseWheelEvent;
+import java.awt.event.MouseWheelListener;
+import java.awt.geom.AffineTransform;
+import java.awt.geom.NoninvertibleTransformException;
+
+/**
+ * This class provides for {@link MouseEvent} re-dispatching. It may be used to set a tool tip on
+ * {@link JXLayer}'s glass pane and still have the child components receive {@link MouseEvent}s.
+ * <p>
+ * <b>Note:</b> A {@link MouseEventUI} instance cannot be shared and can be set
+ * to a single {@link JXLayer} instance only.
+ * <p/>
+ */
+public class MouseEventUI<V extends JComponent> extends AbstractLayerUI<V> {
+
+    static {
+        /*
+         * The instantiating of a JInternalFrame before a MouseEventUI is set to
+         * a JXLayer containing a JDesktopPane that has no JInternalFrames set,
+         * prevents the failing of re dispatched MouseEvents.
+         *
+         * This is a work around a problem that I don't really understand.
+         * Please see
+         * http://forums.java.net/jive/thread.jspa?threadID=66763&tstart=0 for a
+         * discussion on this problem.
+         */
+        new JInternalFrame();
+    }
+
+    @Nullable
+    private Component lastEnteredTarget, lastPressedTarget;
+    private boolean dispatchingMode = false;
+    @Nullable
+    private JXLayer<? extends V> installedLayer;
+
+    /**
+     * Overridden to override the {@link LayerUI} implementation that only consults the view.
+     * <p>
+     * This implementation is a copy of the {@link ComponentUI#contains(JComponent, int, int)}
+     * method.
+     */
+    @SuppressWarnings("deprecation")
+    @Override
+    public boolean contains(@NotNull final JComponent c, final int x, final int y) {
+        return c.inside(x, y);
+    }
+
+    /**
+     * Overridden to check if this {@link LayerUI} has not been installed already, and to set the
+     * argument {@code component} as the installed {@link JXLayer}.
+     *
+     * @throws IllegalStateException when this {@link LayerUI} has been installed already
+     * @see #getInstalledLayer()
+     */
+    @SuppressWarnings("unchecked")
+    @Override
+    public void installUI(@NotNull final JComponent component) throws IllegalStateException {
+        super.installUI(component);
+        if (installedLayer != null) {
+            throw new IllegalStateException(this.getClass().getName()
+                                                    + " cannot be shared between multiple layers");
+        }
+        installedLayer = (JXLayer<? extends V>) component;
+    }
+
+    /**
+     * Overridden to remove the installed {@link JXLayer}.
+     */
+    @Override
+    public void uninstallUI(@NotNull final JComponent c) {
+        installedLayer = null;
+        super.uninstallUI(c);
+    }
+
+    /**
+     * Overridden to only get the following event types: {@link AWTEvent#MOUSE_EVENT_MASK}, {@link
+     * AWTEvent#MOUSE_MOTION_EVENT_MASK} and {@link AWTEvent#MOUSE_WHEEL_EVENT_MASK}.
+     */
+    @Override
+    public long getLayerEventMask() {
+        return AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK
+                | AWTEvent.MOUSE_WHEEL_EVENT_MASK;
+    }
+
+    /**
+     * Overridden to allow for re-dispatching of mouse events to their intended (visual) recipients,
+     * rather than to the components according to their bounds.
+     */
+    @Override
+    public void eventDispatched(final AWTEvent event, @NotNull final JXLayer<? extends V> layer) {
+        if (event instanceof MouseEvent) {
+            MouseEvent mouseEvent = (MouseEvent) event;
+            if (!dispatchingMode) {
+                // Process an original mouse event
+                dispatchingMode = true;
+                try {
+                    redispatch(mouseEvent, layer);
+                } finally {
+                    dispatchingMode = false;
+                }
+            } else {
+                // Process a generated mouse event
+                /*
+                 * Added a check, because on mouse entered or exited, the cursor
+                 * may be set to specific dragging cursors.
+                 */
+                if (MouseEvent.MOUSE_ENTERED == mouseEvent.getID()
+                        || MouseEvent.MOUSE_EXITED == mouseEvent.getID()) {
+                    layer.getGlassPane().setCursor(null);
+                } else {
+                    Component component = mouseEvent.getComponent();
+                    layer.getGlassPane().setCursor(component.getCursor());
+                }
+            }
+        }
+    }
+
+    /**
+     * Re-dispatches the event to the first component in the hierarchy that has a {@link
+     * MouseWheelListener} registered.
+     */
+    @Override
+    protected void processMouseWheelEvent(@NotNull final MouseWheelEvent event,
+                                          @NotNull final JXLayer<? extends V> jxlayer) {
+        /*
+         * Only process an event if it is not already consumed. This may be the
+         * case if this LayerUI is contained in a wrapped hierarchy.
+         */
+        if (!event.isConsumed()) {
+            /*
+             * Since we will create a new event, the argument event must be
+             * consumed.
+             */
+            event.consume();
+            /*
+             * Find a target up in the hierarchy that has
+             * MouseWheelEventListeners registered.
+             */
+            Component target = event.getComponent();
+            Component newTarget = findWheelListenerComponent(target);
+            if (newTarget == null) {
+                newTarget = jxlayer.getParent();
+            }
+            /*
+             * Convert the location relative to the new target
+             */
+            Point point = SwingUtilities.convertPoint(event.getComponent(),
+                                                      event.getPoint(), newTarget);
+            /*
+             * Create a new event and dispatch it.
+             */
+            newTarget.dispatchEvent(createMouseWheelEvent(event, point,
+                                                          newTarget));
+        }
+    }
+
+    @NotNull
+    private Point calculateTargetPoint(@NotNull final JXLayer<? extends V> layer,
+                                       @NotNull final MouseEvent mouseEvent) {
+        Point point = mouseEvent.getPoint();
+        SwingUtilities.convertPointToScreen(point, mouseEvent.getComponent());
+        SwingUtilities.convertPointFromScreen(point, layer);
+        /*
+         * Removed the contains check because it results in jumping when
+         * dragging internal frames in a desktop pane and dragging outside the
+         * boundaries of the desktop.
+         *
+         * Introduced this check to solve some scrolling problem, but don't
+         * quite remember the specifics. Maybe that problem is gone by other
+         * changes.
+         */
+        // Rectangle layerBounds = layer.getBounds();
+        // Container parent = layer.getParent();
+        // Rectangle parentRectangle = new Rectangle(-layerBounds.x,
+        // -layerBounds.y, parent.getWidth(), parent.getHeight());
+        // if (parentRectangle.contains(point)) {
+        return transformPoint(layer, point);
+        // } else {
+        // return new Point(-1, -1);
+        // }
+    }
+
+    @NotNull
+    private MouseWheelEvent createMouseWheelEvent(
+            @NotNull final MouseWheelEvent mouseWheelEvent, @NotNull final Point point, @NotNull final Component target) {
+        return new MouseWheelEvent(target, //
+                                   mouseWheelEvent.getID(), //
+                                   mouseWheelEvent.getWhen(), //
+                                   mouseWheelEvent.getModifiersEx(), //
+                                   point.x, //
+                                   point.y, //
+                                   mouseWheelEvent.getClickCount(), //
+                                   mouseWheelEvent.isPopupTrigger(), //
+                                   mouseWheelEvent.getScrollType(), //
+                                   mouseWheelEvent.getScrollAmount(), //
+                                   mouseWheelEvent.getWheelRotation() //
+        );
+    }
+
+    private void dispatchMouseEvent(@Nullable final MouseEvent mouseEvent) {
+        if (mouseEvent != null) {
+            Component target = mouseEvent.getComponent();
+            target.dispatchEvent(mouseEvent);
+            /*
+             * Used to check the re dispatching behavior
+             */
+            // switch (mouseEvent.getID()) {
+            // case (MouseEvent.MOUSE_PRESSED):
+            // System.out.println();
+            // case (MouseEvent.MOUSE_RELEASED):
+            // case (MouseEvent.MOUSE_CLICKED):
+            // System.out.println("Dispatched mouse event " + mouseEvent);
+            // }
+        }
+    }
+
+    @Contract("null -> null")
+    @Nullable
+    private Component findWheelListenerComponent(@Nullable final Component target) {
+        if (target == null) {
+            return null;
+        } else if (target.getMouseWheelListeners().length == 0) {
+            return findWheelListenerComponent(target.getParent());
+        } else {
+            return target;
+        }
+    }
+
+    private void generateEnterExitEvents(@NotNull final JXLayer<? extends V> layer,
+                                         @NotNull final MouseEvent originalEvent, final Component newTarget, @NotNull final Point realPoint) {
+        if (lastEnteredTarget != newTarget) {
+            dispatchMouseEvent(transformMouseEvent(layer, originalEvent,
+                                                   lastEnteredTarget, realPoint, MouseEvent.MOUSE_EXITED));
+            lastEnteredTarget = newTarget;
+            dispatchMouseEvent(transformMouseEvent(layer, originalEvent,
+                                                   lastEnteredTarget, realPoint, MouseEvent.MOUSE_ENTERED));
+        }
+    }
+
+    @SuppressWarnings("DuplicatedCode")
+    @Nullable
+    private Component getListeningComponent(@NotNull final MouseEvent event, @NotNull final Component component) {
+        Component comp;
+        switch (event.getID()) {
+            case MouseEvent.MOUSE_CLICKED:
+            case MouseEvent.MOUSE_ENTERED:
+            case MouseEvent.MOUSE_EXITED:
+            case MouseEvent.MOUSE_PRESSED:
+            case MouseEvent.MOUSE_RELEASED:
+                comp = getMouseListeningComponent(component);
+                break;
+            case MouseEvent.MOUSE_DRAGGED:
+            case MouseEvent.MOUSE_MOVED:
+                comp = getMouseMotionListeningComponent(component);
+                break;
+            case MouseEvent.MOUSE_WHEEL:
+                comp = getMouseWheelListeningComponent(component);
+                break;
+            default:
+                comp = null;
+        }
+        return comp;
+    }
+
+    @Nullable
+    private Component getMouseListeningComponent(@NotNull final Component component) {
+        if (component.getMouseListeners().length > 0) {
+            return component;
+        } else {
+            Container parent = component.getParent();
+            if (parent != null) {
+                return getMouseListeningComponent(parent);
+            } else {
+                return null;
+            }
+        }
+    }
+
+    @SuppressWarnings("Duplicates")
+    @Nullable
+    private Component getMouseMotionListeningComponent(@NotNull final Component component) {
+        /*
+         * Mouse motion events may result in MOUSE_ENTERED and MOUSE_EXITED.
+         *
+         * Therefore, components with MouseListeners registered should be
+         * returned as well.
+         */
+        if (component.getMouseMotionListeners().length > 0
+                || component.getMouseListeners().length > 0) {
+            return component;
+        } else {
+            Container parent = component.getParent();
+            if (parent != null) {
+                return getMouseMotionListeningComponent(parent);
+            } else {
+                return null;
+            }
+        }
+    }
+
+    @Nullable
+    private Component getMouseWheelListeningComponent(@NotNull final Component component) {
+        if (component.getMouseWheelListeners().length > 0) {
+            return component;
+        } else {
+            Container parent = component.getParent();
+            if (parent != null) {
+                return getMouseWheelListeningComponent(parent);
+            } else {
+                return null;
+            }
+        }
+    }
+
+    @Nullable
+    private Component getTarget(@NotNull final JXLayer<? extends V> layer, @NotNull final Point targetPoint) {
+        Component view = layer.getView();
+        if (view == null) {
+            return null;
+        } else {
+            Point viewPoint = SwingUtilities.convertPoint(layer, targetPoint,
+                                                          view);
+            return SwingUtilities.getDeepestComponentAt(view, viewPoint.x,
+                                                        viewPoint.y);
+        }
+    }
+
+    @SuppressWarnings("Duplicates")
+    private void redispatch(@NotNull final MouseEvent originalEvent,
+                            @NotNull final JXLayer<? extends V> layer) {
+        if (layer.getView() != null) {
+            if (originalEvent.getComponent() != layer.getGlassPane()) {
+                originalEvent.consume();
+            }
+            MouseEvent newEvent = null;
+
+            Point realPoint = calculateTargetPoint(layer, originalEvent);
+            Component realTarget = getTarget(layer, realPoint);
+            if (realTarget != null) {
+                realTarget = getListeningComponent(originalEvent, realTarget);
+            }
+
+            switch (originalEvent.getID()) {
+                case MouseEvent.MOUSE_PRESSED:
+                    newEvent = transformMouseEvent(layer, originalEvent, realTarget, realPoint);
+                    if (newEvent != null) {
+                        lastPressedTarget = newEvent.getComponent();
+                    }
+                    break;
+                case MouseEvent.MOUSE_RELEASED:
+                    newEvent =
+                            transformMouseEvent(layer, originalEvent, lastPressedTarget, realPoint);
+                    lastPressedTarget = null;
+                    break;
+                case MouseEvent.MOUSE_ENTERED:
+                case MouseEvent.MOUSE_EXITED:
+                    generateEnterExitEvents(layer, originalEvent, realTarget, realPoint);
+                    break;
+                case MouseEvent.MOUSE_MOVED:
+                    newEvent = transformMouseEvent(layer, originalEvent, realTarget, realPoint);
+                    generateEnterExitEvents(layer, originalEvent, realTarget, realPoint);
+                    break;
+                case MouseEvent.MOUSE_DRAGGED:
+                    newEvent =
+                            transformMouseEvent(layer, originalEvent, lastPressedTarget, realPoint);
+                    generateEnterExitEvents(layer, originalEvent, realTarget, realPoint);
+                    break;
+                case MouseEvent.MOUSE_CLICKED:
+                    newEvent = transformMouseEvent(layer, originalEvent, realTarget, realPoint);
+                    break;
+                case (MouseEvent.MOUSE_WHEEL):
+                    redispatchMouseWheelEvent((MouseWheelEvent) originalEvent, realTarget, layer);
+                    break;
+            }
+            dispatchMouseEvent(newEvent);
+        }
+    }
+
+    private void redispatchMouseWheelEvent(@NotNull final MouseWheelEvent mouseWheelEvent,
+                                           final Component target, @NotNull final JXLayer<? extends V> layer) {
+        MouseWheelEvent newEvent = this.transformMouseWheelEvent(
+                mouseWheelEvent, target, layer);
+        processMouseWheelEvent(newEvent, layer);
+    }
+
+    @Nullable
+    private MouseEvent transformMouseEvent(@NotNull final JXLayer<? extends V> layer,
+                                           @NotNull final MouseEvent mouseEvent, final Component target, @NotNull final Point realPoint) {
+        return transformMouseEvent(layer, mouseEvent, target, realPoint,
+                                   mouseEvent.getID());
+    }
+
+    @Nullable
+    private MouseEvent transformMouseEvent(@NotNull final JXLayer<? extends V> layer,
+                                           @NotNull final MouseEvent mouseEvent, @Nullable final Component target, @NotNull final Point targetPoint, final int id) {
+        if (target == null) {
+            return null;
+        } else {
+            Point newPoint = new Point(targetPoint);
+            SwingUtilities.convertPointToScreen(newPoint, layer);
+            SwingUtilities.convertPointFromScreen(newPoint, target);
+            return new MouseEvent(target, //
+                                  id, //
+                                  mouseEvent.getWhen(), //
+                                  mouseEvent.getModifiersEx(), //
+                                  newPoint.x, //
+                                  newPoint.y, //
+                                  mouseEvent.getClickCount(), //
+                                  mouseEvent.isPopupTrigger(), //
+                                  mouseEvent.getButton());
+        }
+    }
+
+    @NotNull
+    private MouseWheelEvent transformMouseWheelEvent(
+            @NotNull final MouseWheelEvent mouseWheelEvent, final Component t,
+            final JXLayer<? extends V> layer) {
+        var target = t;
+        if (target == null) {
+            target = layer;
+        }
+        Point point = SwingUtilities.convertPoint(mouseWheelEvent.getComponent(),
+                                                  mouseWheelEvent.getPoint(), target);
+        return createMouseWheelEvent(mouseWheelEvent,
+                                     point, target);
+    }
+
+    @NotNull
+    private Point transformPoint(final JXLayer<? extends V> layer, @NotNull final Point point) {
+        AffineTransform transform = this.getTransform(layer);
+        if (transform != null) {
+            try {
+                transform.inverseTransform(point, point);
+            } catch (NoninvertibleTransformException e) {
+                e.printStackTrace();
+            }
+        }
+        return point;
+    }
+
+    @Nullable
+    protected JXLayer<? extends V> getInstalledLayer() {
+        return installedLayer;
+    }
+
+}

src/main/java/org/pbjar/jxlayer/plaf/ext/TransformUI.java

@@ -0,0 +1,644 @@
+package org.pbjar.jxlayer.plaf.ext;
+/*
+ * Copyright (c) 2009, Piet Blok
+ * All rights reserved.
+ * <p>
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * <p>
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ * * Neither the name of the copyright holder nor the names of the
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * <p>
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+import com.sun.java.swing.SwingUtilities3;
+import com.weis.darklaf.LogFormatter;
+import org.jdesktop.jxlayer.JXLayer;
+import org.jdesktop.jxlayer.plaf.AbstractBufferedLayerUI;
+import org.jdesktop.jxlayer.plaf.LayerUI;
+import org.jdesktop.swingx.ForwardingRepaintManager;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.pbjar.jxlayer.plaf.ext.transform.DefaultTransformModel;
+import org.pbjar.jxlayer.plaf.ext.transform.TransformLayout;
+import org.pbjar.jxlayer.plaf.ext.transform.TransformModel;
+import org.pbjar.jxlayer.plaf.ext.transform.TransformRPMAnnotation;
+import org.pbjar.jxlayer.plaf.ext.transform.TransformRPMFallBack;
+import org.pbjar.jxlayer.plaf.ext.transform.TransformRPMSwingX;
+import org.pbjar.jxlayer.repaint.RepaintManagerProvider;
+import org.pbjar.jxlayer.repaint.RepaintManagerUtils;
+import org.pbjar.jxlayer.repaint.WrappedRepaintManager;
+
+import javax.swing.*;
+import javax.swing.border.Border;
+import javax.swing.event.ChangeListener;
+import javax.swing.text.GlyphView.GlyphPainter;
+import javax.swing.text.JTextComponent;
+import java.awt.*;
+import java.awt.geom.AffineTransform;
+import java.awt.geom.Area;
+import java.awt.image.BufferedImage;
+import java.beans.PropertyChangeListener;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.logging.ConsoleHandler;
+import java.util.logging.Logger;
+
+/**
+ * This class provides for all necessary functionality when using transformations in a {@link
+ * LayerUI}.
+ *
+ * <p>Some implementation details:
+ *
+ * <p>
+ *
+ * <ul>
+ * <li>It extends {@link MouseEventUI} because, when applying transformations, the whereabouts of
+ * child components on screen (device space) do not necessarily match the location according
+ * to their bounds as set by layout managers (component space). So, mouse events must always
+ * be redirected to the intended recipients.
+ * <li>When enabled, this implementation sets a different {@link LayoutManager} to be used by
+ * {@link JXLayer}. Instead of setting the size of the view to {@link JXLayer}'s inner area,
+ * it sets the size of the view to the view's <em>preferred</em> size and centers it in the
+ * inner area. Also, when calculating the preferred size of {@link JXLayer}, it transforms the
+ * normally calculated size with the {@link AffineTransform} returned from {@link
+ * #getPreferredTransform(Dimension, JXLayer)}.
+ * <li>This implementation allocates a fresh {@link BufferedImage} the size of the clip area, each
+ * time that the {@link #paint(Graphics, JComponent)} method is invoked. This is different
+ * from the implementation of {@link AbstractBufferedLayerUI}, that maintains a cached image,
+ * the size of the view. An important reason to not follow the {@link AbstractBufferedLayerUI}
+ * strategy is that, when applying scaling transformations with a large scaling factor, a
+ * {@link OutOfMemoryError} may be thrown because it will try to allocate a buffer of an
+ * extreme size, even if not all of its contents will actually be visible on the screen.
+ * <li>Rather than configuring the screen graphics object, the image's graphics object is
+ * configured through {@link #configureGraphics(Graphics2D, JXLayer)}.
+ * <li>Regardless of whether or not the view is opaque, a background color is painted. It is
+ * obtained from the first component upwards in the hierarchy starting with the view, that is
+ * opaque. If an opaque component is not found, the background color of the layer is used.
+ * Painting the background is necessary to prevent visual artifacts when the transformation is
+ * changed dynamically.
+ * <li>Rendering hints may be set with {@link #setRenderingHints(Map)}, {@link
+ * #addRenderingHint(RenderingHints.Key, Object)} and {@link #addRenderingHints(Map)}.
+ * </ul>
+ *
+ * <p>Known limitations:
+ *
+ * <p>
+ *
+ * <ol>
+ * <li>In Java versions <b>before Java 6u10</b>, this implementation employs a custom {@link
+ * RepaintManager} in order to have descendant's repaint requests propagated up to the {@link
+ * JXLayer} ancestor. This {@link RepaintManager} will work well with and without other {@link
+ * RepaintManager} that are either subclasses of the {@link WrappedRepaintManager} or SwingX's
+ * {@link ForwardingRepaintManager}. Other {@link RepaintManager}s may cause conflicts.
+ * <p>In Java versions <b>6u10 or higher</b>, an attempt will be made to use the new
+ * RepaintManager delegate facility that has been designed for JavaFX.
+ * <li>Transformations will be applied on the whole of the content of the {@link JXLayer}. The
+ * result is that {@link Border}s and other content within {@link JXLayer}'s insets will
+ * generally either be invisible, or will be rendered in a very undesirable way. If you want a
+ * {@link Border} to be transformed together with {@link JXLayer}'s view, that border should
+ * be set on the view instead. On the other hand, if you want the {@link Border} not to be
+ * transformed, that border must be set on {@link JXLayer}'s parent.
+ * </ol>
+ *
+ * <b>Note:</b> A {@link TransformUI} instance cannot be shared and can be set to a single {@link
+ * JXLayer} instance only.
+ *
+ * @author Piet Blok
+ */
+public class TransformUI extends MouseEventUI<JComponent> {
+
+
+    private static final LayoutManager transformLayout = new TransformLayout();
+    private static final String KEY_VIEW = "view";
+    private static final boolean delegatePossible;
+    private static final RepaintManager wrappedManager = new TransformRepaintManager();
+    private static final Logger LOGGER = Logger.getLogger(TransformUI.class.getName());
+
+    static {
+        LOGGER.setUseParentHandlers(false);
+        ConsoleHandler handler = new ConsoleHandler();
+        handler.setFormatter(new LogFormatter());
+        LOGGER.addHandler(handler);
+
+        boolean value;
+        try {
+            SwingUtilities3.class.getMethod("setDelegateRepaintManager", JComponent.class, RepaintManager.class);
+            value = true;
+        } catch (Throwable t) {
+            value = false;
+        }
+        delegatePossible = value;
+        LOGGER.info("Java " + System.getProperty("java.version") + " " + System.getProperty("java.vm.version")
+                            + (delegatePossible ? ": RepaintManager delegate facility for JavaFX will be used."
+                                                : ": RepaintManager.setCurrentManager() will be used."));
+    }
+
+    private final ChangeListener changeListener = e -> revalidateLayer();
+    private final RepaintManagerProvider rpmProvider =
+            new RepaintManagerProvider() {
+
+                @NotNull
+                @Override
+                public Class<? extends ForwardingRepaintManager> getForwardingRepaintManagerClass() {
+                    return TransformRPMSwingX.class;
+                }
+
+                @NotNull
+                @Override
+                public Class<? extends WrappedRepaintManager> getWrappedRepaintManagerClass() {
+                    return TransformRPMFallBack.class;
+                }
+
+                @Override
+                public boolean isAdequate(@NotNull final Class<? extends RepaintManager> manager) {
+                    return manager.isAnnotationPresent(TransformRPMAnnotation.class);
+                }
+            };
+    private final Map<RenderingHints.Key, Object> renderingHints = new HashMap<>();
+    private final Set<JComponent> originalDoubleBuffered = new HashSet<>();
+    private JComponent view;
+    private final PropertyChangeListener viewChangeListener =
+            evt -> setView((JComponent) evt.getNewValue());
+    @Nullable
+    private TransformModel transformModel;
+    private LayoutManager originalLayout;
+
+    /**
+     * Construct a {@link TransformUI} with a {@link DefaultTransformModel}.
+     */
+    public TransformUI() {
+        this(new DefaultTransformModel());
+    }
+
+    /**
+     * Construct a {@link TransformUI} with a specified model.
+     *
+     * @param model the model
+     */
+    public TransformUI(final TransformModel model) {
+        super();
+        this.setModel(model);
+    }
+
+    private void revalidateLayer() {
+        JXLayer<? extends JComponent> installedLayer = this.getInstalledLayer();
+        if (installedLayer != null) {
+            installedLayer.revalidate();
+            installedLayer.repaint();
+        }
+    }
+
+    /**
+     * {@link JTextComponent} and its descendants have some caret position problems when used inside a
+     * transformed {@link JXLayer}. When you plan to use {@link JTextComponent}(s) inside the
+     * hierarchy of a transformed {@link JXLayer}, call this method in an early stage, before
+     * instantiating any {@link JTextComponent}.
+     *
+     * <p>It executes the following method:
+     *
+     * <pre>
+     * System.setProperty(&quot;i18n&quot;, Boolean.TRUE.toString());
+     * </pre>
+     *
+     * <p>As a result, a {@link GlyphPainter} will be selected that uses floating point instead of
+     * fixed point calculations.
+     */
+    public static void prepareForJTextComponent() {
+        System.setProperty("i18n", Boolean.TRUE.toString());
+    }
+
+    /**
+     * Add one rendering hint to the currently active rendering hints.
+     *
+     * @param key   the key
+     * @param value the value
+     */
+    public void addRenderingHint(final RenderingHints.Key key, final Object value) {
+        this.renderingHints.put(key, value);
+    }
+
+    /**
+     * Add new rendering hints to the currently active rendering hints.
+     *
+     * @param hints the new rendering hints
+     */
+    public void addRenderingHints(@NotNull final Map<RenderingHints.Key, Object> hints) {
+        this.renderingHints.putAll(hints);
+    }
+
+    /**
+     * Get the {@link TransformModel}.
+     *
+     * @return the {@link TransformModel}
+     * @see #setModel(TransformModel)
+     */
+    @Contract(pure = true)
+    @Nullable
+    public final TransformModel getModel() {
+        return transformModel;
+    }
+
+    /**
+     * Set a new {@link TransformModel}. The new model may not be {@code null}.
+     *
+     * @param transformModel the new model
+     * @throws NullPointerException if transformModel is {@code null}
+     * @see #getModel()
+     */
+    @Contract("null -> fail")
+    public final void setModel(@Nullable final TransformModel transformModel) throws NullPointerException {
+        if (transformModel == null) {
+            throw new NullPointerException("The TransformModel may not be null");
+        }
+        if (this.transformModel != null) {
+            this.transformModel.removeChangeListener(this.changeListener);
+        }
+        this.transformModel = transformModel;
+        this.transformModel.addChangeListener(this.changeListener);
+        revalidateLayer();
+    }
+
+    /**
+     * Get a preferred {@link AffineTransform}. This method will typically be invoked by programs that
+     * calculate a preferred size.
+     *
+     * <p>The {@code size} argument will be used to compute anchor values for some types of
+     * transformations. If the {@code size} argument is {@code null} a value of (0,0) is used for the
+     * anchor.
+     *
+     * <p>In {@code enabled} state this method is delegated to the {@link TransformModel} that has
+     * been set. Otherwise {@code null} will be returned.
+     *
+     * @param size  a {@link Dimension} instance to be used for an anchor or {@code null}
+     * @param layer the {@link JXLayer}.
+     * @return a {@link AffineTransform} instance or {@code null}
+     */
+    @NotNull
+    public AffineTransform getPreferredTransform(
+            final Dimension size, final JXLayer<? extends JComponent> layer) {
+
+        return this.transformModel.getPreferredTransform(size, layer);
+    }
+
+  /*
+   {@inheritDoc}
+   <p>
+   This implementation does the following:
+   <ol>
+   <li>
+   A {@link BufferedImage} is created the size of the clip bounds of the
+   argument graphics object.</li>
+   <li>
+   A Graphics object is obtained from the image.</li>
+   <li>
+   The image is filled with a background color.</li>
+   <li>
+   The image graphics is translated according to x and y of the clip bounds.
+   </li>
+   <li>
+   The clip from the argument graphics object is set to the image graphics.</li>
+   <li>
+   {@link #configureGraphics(Graphics2D, JXLayer)} is invoked with the image
+   graphics as an argument.</li>
+   <li>
+   {@link #paintLayer(Graphics2D, JXLayer)} is invoked with the image
+   graphics as an argument.</li>
+   <li>
+   The image graphics is disposed.</li>
+   <li>
+   The image is drawn on the argument graphics object.</li>
+   </ol>
+  */
+  /* @SuppressWarnings("unchecked")
+  @Override
+  public final void paint(Graphics g, JComponent component) {
+  Graphics2D g2 = (Graphics2D) g;
+  JXLayer<? extends JComponent> layer = (JXLayer<? extends JComponent>) component;
+  Shape clip = g2.getClip();
+  Rectangle clipBounds = g2.getClipBounds();
+  BufferedImage buffer = layer.getGraphicsConfiguration()
+  .createCompatibleImage(clipBounds.width, clipBounds.height,
+  Transparency.OPAQUE);//
+  Graphics2D g3 = buffer.createGraphics();
+  try {
+  g3.setColor(this.getBackgroundColor(layer));
+  g3.fillRect(0, 0, buffer.getWidth(), buffer.getHeight());
+  g3.translate(-clipBounds.x, -clipBounds.y);
+  g3.setClip(clip);
+  configureGraphics(g3, layer);
+  paintLayer(g3, layer);
+  } catch (Throwable t) {*/
+    /*
+     * Under some rare circumstances, the graphics engine may throw a
+     * transformation exception like this:
+     *
+     * sun.dc.pr.PRError: setPenT4: invalid pen transformation
+     * (singular)
+     *
+     * As far as I understand this happens when the result of the
+     * transformation has a zero sized surface.
+     *
+     * It will happen for example when shear X and shear Y are both set
+     * to 1.
+     *
+     * It will also happen when scale X or scale Y are set to 0.
+     *
+     * Since this Exception only seems to be thrown under the condition
+     * of a zero sized painting surface, no harm is done. Therefore the
+     * error logging below has been commented out, but remain in the
+     * source for the case that someone wants to investigate this
+     * phenomenon in more depth.
+     *
+     * The Exception however MUST be caught, not only to be able dispose
+     * the image's graphics object, but also to prevent that JXLayer
+     * enters a problematic state (the isPainting flag would not be
+     * reset).
+     */
+    // System.err.println(t);
+    // AffineTransform at = g3.getTransform();
+    // System.err.println(at);
+    // System.err.println("scaleX = " + at.getScaleX() + " scaleY = "
+    // + at.getScaleY() + " shearX = " + at.getShearX()
+    // + " shearY = " + at.getShearY());
+  /*} finally {
+  g3.dispose();
+  }
+  g2.drawImage(buffer, clipBounds.x, clipBounds.y, null);
+  setDirty(false);
+  }*/
+
+    /**
+     * Overridden to replace the {@link LayoutManager}, to add some listeners and to ensure that an
+     * appropriate {@link RepaintManager} is installed.
+     *
+     * @see #uninstallUI(JComponent)
+     */
+    @Override
+    public void installUI(@NotNull final JComponent component) {
+        super.installUI(component);
+        JXLayer<? extends JComponent> installedLayer = this.getInstalledLayer();
+        originalLayout = installedLayer.getLayout();
+        installedLayer.addPropertyChangeListener(KEY_VIEW, this.viewChangeListener);
+        installedLayer.setLayout(transformLayout);
+        setView(installedLayer.getView());
+        if (!delegatePossible) {
+            RepaintManagerUtils.ensureRepaintManagerSet(installedLayer, rpmProvider);
+        }
+    }
+
+    /**
+     * Overridden to restore the original {@link LayoutManager} and remove some listeners.
+     *
+     * @param c the component.
+     */
+    @Override
+    public void uninstallUI(@NotNull final JComponent c) {
+        JXLayer<? extends JComponent> installedLayer = this.getInstalledLayer();
+        Objects.requireNonNull(installedLayer)
+               .removePropertyChangeListener(KEY_VIEW, this.viewChangeListener);
+        installedLayer.setLayout(originalLayout);
+        setView(null);
+        super.uninstallUI(c);
+    }
+
+    private void setView(final JComponent view) {
+        if (delegatePossible) {
+            if (this.view != null) {
+                SwingUtilities3.setDelegateRepaintManager(this.view, null);
+            }
+        }
+        this.view = view;
+        if (delegatePossible) {
+            if (this.view != null) {
+                SwingUtilities3.setDelegateRepaintManager(this.view, wrappedManager);
+            }
+        }
+        setDirty(true);
+    }
+
+    /**
+     * Replace the currently active rendering hints with new hints.
+     *
+     * @param hints the new rendering hints or {@code null} to clear all rendering hints
+     */
+    public void setRenderingHints(@Nullable final Map<RenderingHints.Key, Object> hints) {
+        this.renderingHints.clear();
+        if (hints != null) {
+            this.renderingHints.putAll(hints);
+        }
+    }
+
+    /**
+     * Primarily intended for use by {@link RepaintManager}.
+     *
+     * @param rect  a rectangle
+     * @param layer the layer
+     * @return the argument rectangle if no {@link AffineTransform} is available, else a new rectangle
+     */
+    public final Rectangle transform(@NotNull final Rectangle rect, final JXLayer<? extends JComponent> layer) {
+        AffineTransform at = getTransform(layer);
+        if (at == null) {
+            return rect;
+        } else {
+            Area area = new Area(rect);
+            area.transform(at);
+            return area.getBounds();
+        }
+    }
+
+    /**
+     * Mark {@link TransformUI} as dirty if the LookAndFeel was changed.
+     *
+     * @param layer the {@link JXLayer} this {@link TransformUI} is set to
+     */
+    @Override
+    public void updateUI(final JXLayer<? extends JComponent> layer) {
+        setDirty(true);
+    }
+
+    /*
+     * Get the most suitable background color.
+     */
+    private Color getBackgroundColor(@NotNull final JXLayer<? extends JComponent> layer) {
+        Container colorProvider = layer.getView() == null ? layer : layer.getView();
+        while (colorProvider != null && !colorProvider.isOpaque()) {
+            colorProvider = colorProvider.getParent();
+        }
+        return colorProvider == null ? SystemColor.desktop : colorProvider.getBackground();
+    }
+
+    /**
+     * Set a complete hierarchy to non double buffered and remember the components that were double
+     * buffered.
+     *
+     * @param component the component.
+     */
+    private void setToNoDoubleBuffering(final Component component) {
+        if (component instanceof JComponent) {
+            JComponent comp = (JComponent) component;
+            if (comp.isDoubleBuffered()) {
+                originalDoubleBuffered.add(comp);
+                comp.setDoubleBuffered(false);
+            }
+        }
+        if (component instanceof Container) {
+            Container container = (Container) component;
+            for (int index = 0; index < container.getComponentCount(); index++) {
+                setToNoDoubleBuffering(container.getComponent(index));
+            }
+        }
+    }
+
+    /**
+     * If the view of the {@link JXLayer} is (partly) obscured by its parent (this is the case when
+     * the size of the view (in component space) is larger than the size of the {@link JXLayer}), the
+     * obscured parts will not be painted by the super implementation. Therefore, only under this
+     * condition, a special painting technique is executed:
+     *
+     * <ol>
+     * <li>All descendants of the {@link JXLayer} are temporarily set to non double buffered.
+     * <li>The graphics object is translated for the X and Y coordinates of the view.
+     * <li>The view is painted.
+     * <li>The original double buffered property is restored for all descendants.
+     * </ol>
+     *
+     * <p>In all other cases, the super method is invoked.
+     *
+     * <p>The {@code g2} argument is a graphics object obtained from a {@link BufferedImage}.
+     *
+     * @see #paint(Graphics, JComponent)
+     */
+    @Override
+    protected final void paintLayer(
+            @NotNull final Graphics2D g2, @NotNull final JXLayer<? extends JComponent> layer) {
+        JComponent view = layer.getView();
+        if (view != null) {
+            if (view.getX() < 0 || view.getY() < 0) {
+                setToNoDoubleBuffering(view);
+                g2.translate(view.getX(), view.getY());
+                view.paint(g2);
+                for (JComponent comp : originalDoubleBuffered) {
+                    comp.setDoubleBuffered(true);
+                }
+                originalDoubleBuffered.clear();
+                return;
+            }
+        }
+        super.paintLayer(g2, layer);
+    }
+
+    /**
+     * Get the {@link AffineTransform} customized for the {@code layer} argument.
+     *
+     * <p>In {@code enabled} state this method is delegated to the {@link TransformModel} that has
+     * been set. Otherwise {@code null} will be returned.
+     */
+    @NotNull
+    @Override
+    protected final AffineTransform getTransform(final JXLayer<? extends JComponent> layer) {
+        return transformModel.getTransform(layer);
+    }
+
+    /**
+     * Get the rendering hints.
+     *
+     * @return the rendering hints
+     * @see #setRenderingHints(Map)
+     * @see #addRenderingHints(Map)
+     * @see #addRenderingHint(RenderingHints.Key, Object)
+     */
+    @NotNull
+    @Override
+    protected Map<RenderingHints.Key, Object> getRenderingHints(final JXLayer<? extends JComponent> layer) {
+        return renderingHints;
+    }
+
+    /**
+     * A delegate {@link RepaintManager} that can be set on the view of a {@link JXLayer} in Java
+     * versions starting with Java 6u10.
+     *
+     * <p>For older Java versions, {@link RepaintManager#setCurrentManager(RepaintManager)} will be
+     * used with either {@link TransformRPMFallBack} or {@link TransformRPMSwingX}.
+     */
+    protected static final class TransformRepaintManager extends RepaintManager {
+
+        private TransformRepaintManager() {
+        }
+
+        /**
+         * Finds the JXLayer ancestor and have ancestor marked invalid via the current {@link
+         * RepaintManager}.
+         */
+        @Override
+        public void addInvalidComponent(final JComponent invalidComponent) {
+            JXLayer<? extends JComponent> layer = findJXLayer(invalidComponent);
+            RepaintManager.currentManager(layer).addInvalidComponent(layer);
+        }
+
+        /**
+         * Finds the JXLayer ancestor and have the ancestor marked as dirty with the transformed
+         * rectangle via the current {@link RepaintManager}.
+         */
+        @Override
+        public void addDirtyRegion(@NotNull final JComponent c, final int x, final int y, final int w, final int h) {
+            if (c.isShowing()) {
+                JXLayer<? extends JComponent> layer = findJXLayer(c);
+                TransformUI ui = (TransformUI) layer.getUI();
+                Point point = c.getLocationOnScreen();
+                SwingUtilities.convertPointFromScreen(point, layer);
+                Rectangle transformPortRegion = ui.transform(new Rectangle(x + point.x, y + point.y, w, h),
+                                                             layer);
+                RepaintManager.currentManager(layer).addDirtyRegion(layer,
+                                                                    transformPortRegion.x,
+                                                                    transformPortRegion.y,
+                                                                    transformPortRegion.width,
+                                                                    transformPortRegion.height);
+            }
+        }
+
+        /**
+         * Find the ancestor {@link JXLayer} instance.
+         *
+         * @param c a component
+         * @return the ancestor {@link JXLayer} instance
+         */
+        @NotNull
+        @SuppressWarnings("unchecked")
+        private JXLayer<? extends JComponent> findJXLayer(final JComponent c) {
+            JXLayer<?> layer = (JXLayer<?>) SwingUtilities.getAncestorOfClass(JXLayer.class, c);
+            if (layer != null) {
+                LayerUI<?> layerUI = layer.getUI();
+                if (layerUI instanceof TransformUI) {
+                    return (JXLayer<? extends JComponent>) layer;
+                } else {
+                    return findJXLayer(layer);
+                }
+            }
+            throw new Error("No parent JXLayer with TransformUI found");
+        }
+    }
+}

src/main/java/org/pbjar/jxlayer/plaf/ext/transform/DefaultLayerLayout.java

@@ -0,0 +1,116 @@
+package org.pbjar.jxlayer.plaf.ext.transform;
+/*
+ * Copyright (c) 2009, Piet Blok
+ * All rights reserved.
+ * <p>
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * <p>
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ * * Neither the name of the copyright holder nor the names of the
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * <p>
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+import org.jdesktop.jxlayer.JXLayer;
+import org.jetbrains.annotations.NotNull;
+
+import java.awt.*;
+import java.io.Serializable;
+
+/**
+ * A copy of the private static inner class in JXLayer.
+ *
+ * @author Piet Blok
+ */
+public class DefaultLayerLayout implements LayoutManager, Serializable {
+    /**
+     * {@inheritDoc}
+     */
+    public void addLayoutComponent(final String name, final Component comp) {
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public void removeLayoutComponent(final Component comp) {
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @NotNull
+    public Dimension preferredLayoutSize(final Container parent) {
+        JXLayer<?> layer = (JXLayer<?>) parent;
+        Insets insets = layer.getInsets();
+        Dimension ret = new Dimension(insets.left + insets.right, insets.top + insets.bottom);
+        Component view = layer.getView();
+        if (view != null) {
+            Dimension size = view.getPreferredSize();
+            if (size.width > 0 && size.height > 0) {
+                ret.width += size.width;
+                ret.height += size.height;
+            }
+        }
+        return ret;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @NotNull
+    public Dimension minimumLayoutSize(final Container parent) {
+        JXLayer<?> layer = (JXLayer<?>) parent;
+        Insets insets = layer.getInsets();
+        Dimension ret = new Dimension(insets.left + insets.right, insets.top + insets.bottom);
+        Component view = layer.getView();
+        if (view != null) {
+            Dimension size = view.getMinimumSize();
+            ret.width += size.width;
+            ret.height += size.height;
+        }
+        if (ret.width == 0 || ret.height == 0) {
+            ret.width = 4;
+            ret.height = 4;
+        }
+        return ret;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public void layoutContainer(final Container parent) {
+        JXLayer<?> layer = (JXLayer<?>) parent;
+        Component view = layer.getView();
+        Component glassPane = layer.getGlassPane();
+        if (view != null) {
+            Insets insets = layer.getInsets();
+            view.setLocation(insets.left, insets.top);
+            view.setSize(
+                    layer.getWidth() - insets.left - insets.right,
+                    layer.getHeight() - insets.top - insets.bottom);
+        }
+        if (glassPane != null) {
+            glassPane.setLocation(0, 0);
+            glassPane.setSize(layer.getWidth(), layer.getHeight());
+        }
+    }
+}

src/main/java/org/pbjar/jxlayer/plaf/ext/transform/DefaultTransformModel.java

@@ -0,0 +1,495 @@
+package org.pbjar.jxlayer.plaf.ext.transform;
+/*
+ * Copyright (c) 2009, Piet Blok All rights reserved.
+ * <p>
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * <p>
+ * * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. * Redistributions in
+ * binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other
+ * materials provided with the distribution. * Neither the name of the copyright
+ * holder nor the names of the contributors may be used to endorse or promote
+ * products derived from this software without specific prior written
+ * permission.
+ * <p>
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+import org.jdesktop.jxlayer.JXLayer;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import javax.swing.*;
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
+import java.awt.*;
+import java.awt.geom.AffineTransform;
+import java.awt.geom.Area;
+import java.awt.geom.Point2D;
+import java.awt.geom.Rectangle2D;
+import java.util.Arrays;
+import java.util.Map;
+import java.util.WeakHashMap;
+import java.util.function.Function;
+
+/**
+ * This is an implementation of {@link TransformModel} with methods to explicitly set transformation
+ * values.
+ *
+ * @author Piet Blok
+ */
+public class DefaultTransformModel implements TransformModel {
+
+    private final Map<ChangeListener, Object> listeners = new WeakHashMap<>();
+    /**
+     * The transform object that will be recalculated upon any change.
+     */
+    private final AffineTransform transform = new AffineTransform();
+    /**
+     * Is populated with the current values.
+     */
+    private final Object[] values = Type.createArray();
+    /**
+     * Is populated with the previous values.
+     */
+    private final Object[] prevValues = Type.createArray();
+
+    private Point2D rotationCenter;
+    private Function<Dimension, Point2D> supplier;
+    private boolean valid = false;
+
+    @Override
+    public void addChangeListener(final ChangeListener listener) {
+        listeners.put(listener, null);
+    }
+
+    @NotNull
+    @Override
+    public AffineTransform getPreferredTransform(@Nullable final Dimension size, final JXLayer<?> layer) {
+        var p = getRotationCenter(size);
+        double centerX = p.getX();
+        double centerY = p.getY();
+        AffineTransform transform = transformNoScale(centerX, centerY);
+        double scaleX = getValue(Type.PreferredScale);
+        transform.translate(centerX, centerY);
+        transform.scale(getValue(Type.Mirror) ? -scaleX : scaleX, scaleX);
+        transform.translate(-centerX, -centerY);
+        return transform;
+    }
+
+    /**
+     * Get the rotation center corresponding to the size.
+     *
+     * @param size the size.
+     * @return center of rotation.
+     */
+    public Point2D getRotationCenter(@Nullable final Dimension size) {
+        if (supplier != null) {
+            return supplier.apply(size);
+        }
+        double centerX = size == null ? 0 : size.getWidth() / 2.0;
+        double centerY = size == null ? 0 : size.getHeight() / 2.0;
+        return rotationCenter == null ? new Point2D.Double(centerX, centerY) : rotationCenter;
+    }
+
+    /**
+     * Apply the prescribed transformations, excluding the scale.
+     *
+     * @param centerX a center X
+     * @param centerY a center Y
+     * @return a new {@link AffineTransform}
+     */
+    @NotNull
+    protected AffineTransform transformNoScale(final double centerX, final double centerY) {
+        AffineTransform at = new AffineTransform();
+        at.translate(centerX, centerY);
+        at.rotate(getRotation());
+        at.quadrantRotate(getQuadrantRotation());
+        at.shear(getShearX(), getShearY());
+        at.translate(-centerX, -centerY);
+        return at;
+    }
+
+    /**
+     * Get the rotation value in radians as set by {@link #setRotation(double)}. The default value is
+     * {@code 0}.
+     *
+     * @return the rotation value.
+     * @see #setRotation(double)
+     */
+    public double getRotation() {
+        return (Double) getValue(Type.Rotation);
+    }
+
+    /**
+     * Get the quadrant rotation value. The default value is {@code 0}.
+     *
+     * @return the quadrant rotation value
+     * @see #setQuadrantRotation(int)
+     */
+    public int getQuadrantRotation() {
+        return (Integer) getValue(Type.QuadrantRotation);
+    }
+
+    /**
+     * Set the rotation in quadrants. The default value is {@code 0}.
+     *
+     * @param newValue the number of quadrants
+     * @see #getQuadrantRotation()
+     */
+    public void setQuadrantRotation(final int newValue) {
+        setValue(Type.QuadrantRotation, newValue);
+    }
+
+    /**
+     * Get the shearX value as set by {@link #setShearX(double)}; The default value is {@code 0}.
+     *
+     * @return the shear x value
+     * @see #setShearX(double)
+     */
+    public double getShearX() {
+        return (Double) getValue(Type.ShearX);
+    }
+
+    /**
+     * Set the shearX value. The default value is {@code 0}.
+     *
+     * @param newValue the shear x
+     * @see #getShearX()
+     */
+    public void setShearX(final double newValue) {
+        setValue(Type.ShearX, newValue);
+    }
+
+    /**
+     * Get the shearY value as set by {@link #setShearY(double)}; The default value is {@code 0}.
+     *
+     * @return the shear y value
+     * @see #setShearY(double)
+     */
+    public double getShearY() {
+        return (Double) getValue(Type.ShearY);
+    }
+
+    /**
+     * Set the shearY value. The default value is {@code 0}.
+     *
+     * @param newValue the shear y
+     * @see #getShearY()
+     */
+    public void setShearY(final double newValue) {
+        setValue(Type.ShearY, newValue);
+    }
+
+    /**
+     * Set the rotation in radians. The default value is {@code 0}.
+     *
+     * @param newValue the rotation in radians
+     * @see #getRotation()
+     */
+    public void setRotation(final double newValue) {
+        setValue(Type.Rotation, newValue);
+    }
+
+    /**
+     * Return the currently active {@link AffineTransform}. Recalculate if needed.
+     *
+     * @return the currently active {@link AffineTransform}
+     */
+    @NotNull
+    @Override
+    public AffineTransform getTransform(@Nullable final JXLayer<? extends JComponent> layer) {
+        JComponent view = layer == null ? null : layer.getView();
+        /*
+         * Set the current actual program values in addition to the user options.
+         */
+        setValue(Type.LayerWidth, layer == null ? 0 : layer.getWidth());
+        setValue(Type.LayerHeight, layer == null ? 0 : layer.getHeight());
+        setValue(Type.ViewWidth, view == null ? 0 : view.getWidth());
+        setValue(Type.ViewHeight, view == null ? 0 : view.getHeight());
+        /*
+         * If any change to previous values, recompute the transform.
+         */
+        if (!Arrays.equals(prevValues, values) || !valid) {
+            System.arraycopy(values, 0, prevValues, 0, values.length);
+            transform.setToIdentity();
+            if (view != null) {
+                var p = getRotationCenter(layer == null ? null : layer.getSize());
+                double centerX = p.getX();
+                double centerY = p.getY();
+
+                AffineTransform nonScaledTransform = transformNoScale(centerX, centerY);
+
+                double scaleX;
+                double scaleY;
+                if (getValue(Type.ScaleToPreferredSize)) {
+                    scaleX = getValue(Type.PreferredScale);
+                    scaleY = scaleX;
+                } else {
+                    Area area = new Area(new Rectangle2D.Double(0, 0, view.getWidth(), view.getHeight()));
+                    area.transform(nonScaledTransform);
+                    Rectangle2D bounds = area.getBounds2D();
+                    scaleX = layer == null ? 0 : layer.getWidth() / bounds.getWidth();
+                    scaleY = layer == null ? 0 : layer.getHeight() / bounds.getHeight();
+
+                    if (getValue(Type.PreserveAspectRatio)) {
+                        scaleX = Math.min(scaleX, scaleY);
+                        scaleY = scaleX;
+                    }
+                }
+
+                transform.translate(centerX, centerY);
+                transform.scale(getValue(Type.Mirror) ? -scaleX : scaleX, scaleY);
+                transform.translate(-centerX, -centerY);
+                transform.concatenate(nonScaledTransform);
+            }
+        }
+        valid = true;
+        return transform;
+    }
+
+    @Override
+    public void removeChangeListener(final ChangeListener listener) {
+        listeners.remove(listener);
+    }
+
+    /**
+     * Get the scale.
+     *
+     * @return the scale
+     * @see #setScale(double)
+     */
+    public double getScale() {
+        return (Double) getValue(Type.PreferredScale);
+    }
+
+    /**
+     * Set a scale.
+     *
+     * <p>The scale is primarily used to calculate a preferred size. Unless {@code
+     * ScaleToPreferredSize} is set to {@code true} (see {@link #setScaleToPreferredSize(boolean)} and
+     * {@link #isScaleToPreferredSize()}), actual scaling itself is calculated such that the view
+     * occupies as much space as possible on the {@link JXLayer}.
+     *
+     * <p>The default value is 1.
+     *
+     * @param newValue the preferred scale
+     * @throws IllegalArgumentException when the argument value is 0
+     * @see #getScale()
+     */
+    public void setScale(final double newValue) throws IllegalArgumentException {
+        if (newValue == 0.0) {
+            throw new IllegalArgumentException("Preferred scale can not be set to 0");
+        }
+        setValue(Type.PreferredScale, newValue);
+    }
+
+    /**
+     * Set a value and fire a PropertyChange.
+     *
+     * @param type     the value type
+     * @param newValue the new value
+     */
+    private void setValue(@NotNull final Type type, final Object newValue) {
+        Object oldValue = values[type.ordinal()];
+        values[type.ordinal()] = newValue;
+        fireChangeEvent(oldValue, newValue);
+    }
+
+    /**
+     * If {!oldValue.equals(newValue)}, a {@link ChangeEvent} will be fired.
+     *
+     * @param oldValue an old value
+     * @param newValue a new value
+     */
+    protected void fireChangeEvent(@NotNull final Object oldValue, final Object newValue) {
+        if (!oldValue.equals(newValue)) {
+            ChangeEvent event = new ChangeEvent(this);
+            for (ChangeListener listener : listeners.keySet()) {
+                listener.stateChanged(event);
+            }
+        }
+    }
+
+    @NotNull
+    @SuppressWarnings("unchecked")
+    protected <T> T getValue(@NotNull final Type type) {
+        return (T) values[type.ordinal()];
+    }
+
+    public void setRotationCenter(final Point2D rotationCenter) {
+        this.rotationCenter = rotationCenter;
+    }
+
+    /**
+     * Get the mirror property.
+     *
+     * <p>The default value is {@code false}.
+     *
+     * @return {@code true} if the transformation will mirror the view.
+     * @see #setMirror(boolean)
+     */
+    public boolean isMirror() {
+        return (Boolean) getValue(Type.Mirror);
+    }
+
+    /**
+     * Set the mirror property.
+     *
+     * <p>The default value is {@code false}
+     *
+     * @param newValue the new value
+     * @see #isMirror()
+     */
+    public void setMirror(final boolean newValue) {
+        setValue(Type.Mirror, newValue);
+    }
+
+    /**
+     * Get the preserve aspect ratio value.
+     *
+     * <p>The default value is {@code true}.
+     *
+     * @return {@code true} if preserving aspect ratio, {@code false} otherwise
+     * @see #setPreserveAspectRatio(boolean)
+     */
+    public boolean isPreserveAspectRatio() {
+        return (Boolean) getValue(Type.PreserveAspectRatio);
+    }
+
+    /**
+     * Set preserve aspect ratio.
+     *
+     * <p>The default value is {@code true}.
+     *
+     * @param newValue the new value
+     * @see #isPreserveAspectRatio()
+     */
+    public void setPreserveAspectRatio(final boolean newValue) {
+        setValue(Type.PreserveAspectRatio, newValue);
+    }
+
+    /**
+     * Get the scale to preferred size value.
+     *
+     * <p>The default value is {@code false}.
+     *
+     * <p>When {@code true}, the view is scaled according to the preferred scale, regardless of the
+     * size of the {@link JXLayer}.
+     *
+     * <p>When {@code false}, the view is scaled to occupy as much as possible of the size of the
+     * {@link JXLayer}.
+     *
+     * @return {@code true} if scale to preferred size, {@code false} otherwise
+     * @see #setScaleToPreferredSize(boolean)
+     */
+    public boolean isScaleToPreferredSize() {
+        return (Boolean) getValue(Type.ScaleToPreferredSize);
+    }
+
+    /**
+     * Set scaleToPreferredSize.
+     *
+     * <p>The default value is {@code false}.
+     *
+     * <p>When {@code true}, the view is scaled according to the preferred scale, regardless of the
+     * size of the {@link JXLayer}.
+     *
+     * <p>When {@code false}, the view is scaled to occupy as much as possible of the size of the
+     * {@link JXLayer}.
+     *
+     * @param newValue the new value
+     * @see #isScaleToPreferredSize()
+     */
+    public void setScaleToPreferredSize(final boolean newValue) {
+        setValue(Type.ScaleToPreferredSize, newValue);
+    }
+
+    /**
+     * Set the supplier for calculating the center of rotation.
+     *
+     * @param supplier the supplier.
+     */
+    public void setRotationCenterSupplier(final Function<Dimension, Point2D> supplier) {
+        {
+            this.supplier = supplier;
+        }
+    }
+
+    /**
+     * Force the translation to be recalculated the next time it is needed.
+     */
+    public void invalidate() {
+        valid = false;
+    }
+
+    /**
+     * Enum for internal convenience.
+     *
+     * <p>Describes the values that on change trigger recalculation of the transform. All have a
+     * default value, used for initializing arrays.
+     *
+     * <p>These enums are used for two purposes:
+     *
+     * <p>1: To easily detect a change that requires renewed calculation of the transform(both program
+     * values and user options).
+     *
+     * <p>2: To generalize setters (both program values and user options) and getters (only
+     * userOptions) for the various values.
+     *
+     * <p>There are two groups:
+     *
+     * <p>1: Program values that reflect the current size etc. of affected components
+     *
+     * <p>2: User options
+     */
+    protected enum Type {
+        /*
+         * Program values
+         */
+        LayerWidth(0),
+        LayerHeight(0),
+        ViewWidth(0),
+        ViewHeight(0),
+        /*
+         * User options
+         */
+        PreferredScale(1.0),
+        Rotation(0.0),
+        ShearX(0.0),
+        ShearY(0.0),
+        QuadrantRotation(0),
+        PreserveAspectRatio(Boolean.TRUE),
+        ScaleToPreferredSize(Boolean.FALSE),
+        Mirror(Boolean.FALSE);
+
+        private final Object defaultValue;
+
+        @Contract(pure = true)
+        Type(final Object defaultValue) {
+            this.defaultValue = defaultValue;
+        }
+
+        @NotNull
+        public static Object[] createArray() {
+            Object[] array = new Object[values().length];
+            for (Type type : values()) {
+                array[type.ordinal()] = type.defaultValue;
+            }
+            return array;
+        }
+    }
+}

src/main/java/org/pbjar/jxlayer/plaf/ext/transform/TransformLayout.java

@@ -0,0 +1,140 @@
+/*
+ Copyright (c) 2009, Piet Blok
+ All rights reserved.
+ <p>
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ <p>
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the following
+ disclaimer in the documentation and/or other materials provided
+ with the distribution.
+ * Neither the name of the copyright holder nor the names of the
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+ <p>
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package org.pbjar.jxlayer.plaf.ext.transform;
+
+import org.jdesktop.jxlayer.JXLayer;
+import org.jdesktop.jxlayer.plaf.LayerUI;
+import org.jetbrains.annotations.NotNull;
+import org.pbjar.jxlayer.plaf.ext.TransformUI;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.geom.AffineTransform;
+import java.awt.geom.Area;
+import java.awt.geom.Rectangle2D;
+
+/**
+ * A specialized layout manager for {@link JXLayer} in combination with the {@link TransformUI}.
+ *
+ * <p>It extends {@link DefaultLayerLayout} and, as long as no enabled {@link TransformUI} is set to
+ * {@link JXLayer}, will act exactly the same as its super class.
+ *
+ * <p>However, when the above conditions are all true, its behavior becomes different:
+ *
+ * <ol>
+ * <li>Instead of setting the view's size to the layer's calculated inner area, it will set the
+ * view's size to its preferred size.
+ * <li>Instead of setting the view's bounds to the calculated inner area, it will center the view
+ * in that inner area. This may result in some parts of the view formally obscured, or, some
+ * parts of the inner area not covered by the view.
+ * <li>The preferred size will first be computed by the super implementation. Then, before
+ * returning, the calculated size will be transformed with the {@link AffineTransform}
+ * returned by {@link TransformUI#getPreferredTransform(Dimension, JXLayer)};
+ * <li>The minimum size will first be computed by the super implementation. Then, before
+ * returning, the calculated size will be transformed with the {@link AffineTransform}
+ * returned by {@link TransformUI#getPreferredTransform(Dimension, JXLayer)};
+ * </ol>
+ *
+ * @see JXLayer#getView()
+ * @see JXLayer#getGlassPane()
+ * @see TransformUI
+ */
+public class TransformLayout extends DefaultLayerLayout {
+
+    /**
+     * Overridden to apply a different layout when the {@link LayerUI} is an instance of {@link
+     * TransformUI}. If this is not the case, the super implementation will be invoked.
+     */
+    @Override
+    public void layoutContainer(final Container parent) {
+        JXLayer<?> layer = (JXLayer<?>) parent;
+        LayerUI<?> layerUI = layer.getUI();
+        if (layerUI instanceof TransformUI) {
+            JComponent view = (JComponent) layer.getView();
+            JComponent glassPane = layer.getGlassPane();
+            if (view != null) {
+                Rectangle innerArea = new Rectangle();
+                SwingUtilities.calculateInnerArea(layer, innerArea);
+                view.setSize(view.getPreferredSize());
+                Rectangle viewRect = new Rectangle(0, 0, view.getWidth(), view.getHeight());
+                int x = (int) Math.round(innerArea.getCenterX() - viewRect.getCenterX());
+                int y = (int) Math.round(innerArea.getCenterY() - viewRect.getCenterY());
+                viewRect.translate(x, y);
+                view.setBounds(viewRect);
+            }
+            if (glassPane != null) {
+                glassPane.setLocation(0, 0);
+                glassPane.setSize(layer.getWidth(), layer.getHeight());
+            }
+            return;
+        }
+        super.layoutContainer(parent);
+    }
+
+    /**
+     * Overridden to apply a preferred transform on the {@link Dimension} object returned from the
+     * super implementation.
+     */
+    @NotNull
+    @Override
+    public Dimension minimumLayoutSize(final Container parent) {
+        return transform(parent, super.minimumLayoutSize(parent));
+    }
+
+    /**
+     * Overridden to apply a preferred transform on the {@link Dimension} object returned from the
+     * super implementation.
+     */
+    @NotNull
+    @Override
+    public Dimension preferredLayoutSize(final Container parent) {
+        return transform(parent, super.preferredLayoutSize(parent));
+    }
+
+    @NotNull
+    @SuppressWarnings("unchecked")
+    private Dimension transform(final Container parent, @NotNull final Dimension size) {
+        JXLayer<JComponent> layer = (JXLayer<JComponent>) parent;
+        LayerUI<?> ui = layer.getUI();
+        if (ui instanceof TransformUI) {
+            TransformUI transformUI = (TransformUI) ui;
+            AffineTransform transform = transformUI.getPreferredTransform(size, layer);
+            if (transform != null) {
+                Area area = new Area(new Rectangle2D.Double(0, 0, size.getWidth(), size.getHeight()));
+                area.transform(transform);
+                Rectangle2D bounds = area.getBounds2D();
+                size.setSize(bounds.getWidth(), bounds.getHeight());
+            }
+        }
+        return size;
+    }
+}

src/main/java/org/pbjar/jxlayer/plaf/ext/transform/TransformModel.java

@@ -0,0 +1,92 @@
+/*
+ Copyright (c) 2009, Piet Blok
+ All rights reserved.
+ <p>
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ <p>
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the following
+ disclaimer in the documentation and/or other materials provided
+ with the distribution.
+ * Neither the name of the copyright holder nor the names of the
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+ <p>
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package org.pbjar.jxlayer.plaf.ext.transform;
+
+import org.jdesktop.jxlayer.JXLayer;
+import org.jetbrains.annotations.NotNull;
+import org.pbjar.jxlayer.plaf.ext.TransformUI;
+
+import javax.swing.*;
+import javax.swing.event.ChangeListener;
+import java.awt.*;
+import java.awt.geom.AffineTransform;
+
+/**
+ * The {@link TransformModel} interface specifies the methods the {@link TransformUI} will use to
+ * interrogate a transformation model.
+ *
+ * @author Piet Blok
+ */
+public interface TransformModel {
+
+    /**
+     * Add a {@link ChangeListener} that will be notified when the internal state of this model
+     * changes.
+     *
+     * @param listener a {@link ChangeListener}
+     * @see #removeChangeListener(ChangeListener)
+     */
+    void addChangeListener(ChangeListener listener);
+
+    /**
+     * Get a preferred {@link AffineTransform}. This method will typically be invoked by programs that
+     * calculate a preferred size.
+     *
+     * <p>The {@code size} argument will be used to compute anchor values for some types of
+     * transformations. If the {@code size} argument is {@code null} a value of (0,0) is used for the
+     * anchor.
+     *
+     * @param size  a {@link Dimension} instance to be used for an anchor or {@code null}
+     * @param layer the {@link JXLayer}.
+     * @return a {@link AffineTransform} instance or {@code null}
+     */
+    @NotNull
+    AffineTransform getPreferredTransform(Dimension size, JXLayer<?> layer);
+
+    /**
+     * Get a {@link AffineTransform}. This method will typically be invoked by programs that are about
+     * to prepare a {@link Graphics} object.
+     *
+     * @param layer the {@link JXLayer}
+     * @return a {@link AffineTransform} or {@code null}
+     */
+    @NotNull
+    AffineTransform getTransform(JXLayer<? extends JComponent> layer);
+
+    /**
+     * Remove a {@link ChangeListener}.
+     *
+     * @param listener a {@link ChangeListener}
+     * @see #addChangeListener(ChangeListener)
+     */
+    void removeChangeListener(ChangeListener listener);
+}

src/main/java/org/pbjar/jxlayer/plaf/ext/transform/TransformRPMAnnotation.java

@@ -0,0 +1,50 @@
+/*
+ Copyright (c) 2009, Piet Blok
+ All rights reserved.
+ <p>
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ <p>
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the following
+ disclaimer in the documentation and/or other materials provided
+ with the distribution.
+ * Neither the name of the copyright holder nor the names of the
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+ <p>
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package org.pbjar.jxlayer.plaf.ext.transform;
+
+import org.pbjar.jxlayer.plaf.ext.TransformUI;
+
+import javax.swing.*;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * A marker for an adequate {@link RepaintManager} for the {@link TransformUI}.
+ *
+ * @author Piet Blok
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface TransformRPMAnnotation {
+}

src/main/java/org/pbjar/jxlayer/plaf/ext/transform/TransformRPMFallBack.java

@@ -0,0 +1,76 @@
+/*
+ Copyright (c) 2008-2009, Piet Blok
+ All rights reserved.
+ <p>
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ <p>
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the following
+ disclaimer in the documentation and/or other materials provided
+ with the distribution.
+ * Neither the name of the copyright holder nor the names of the
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+ <p>
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package org.pbjar.jxlayer.plaf.ext.transform;
+
+import org.jdesktop.swingx.ForwardingRepaintManager;
+import org.jetbrains.annotations.NotNull;
+import org.pbjar.jxlayer.repaint.RepaintManagerProvider;
+import org.pbjar.jxlayer.repaint.RepaintManagerUtils;
+import org.pbjar.jxlayer.repaint.WrappedRepaintManager;
+
+import javax.swing.*;
+
+/**
+ * A specialized {@link RepaintManager} that checks for every JComponent that is being set dirty, if
+ * it has a JXLayer ancestor, equipped with a TransformUI. In that case, the transformed region on
+ * the JXLayer is also marked dirty.
+ *
+ * <p>A fall back class if the {@link ForwardingRepaintManager} cannot be instantiated because the
+ * SwingX packages are not on the class path.
+ *
+ * @see RepaintManagerProvider
+ * @see RepaintManagerUtils
+ * @see TransformRPMSwingX
+ */
+@TransformRPMAnnotation
+public class TransformRPMFallBack extends WrappedRepaintManager {
+
+    /**
+     * Sole constructor.
+     *
+     * @param delegate the delegate {@link RepaintManager}
+     */
+    public TransformRPMFallBack(final RepaintManager delegate) {
+        super(delegate);
+        TransformRPMImpl.hackInitialization(delegate, this);
+    }
+
+    /**
+     * Delegates and then marks a JXLayer ancestor as dirty with the transformed rectangle.
+     */
+    @Override
+    public void addDirtyRegion(@NotNull final JComponent c, final int x, final int y, final int w, final int h) {
+        if (!TransformRPMImpl.addDirtyRegion(c, x, y, w, h, this)) {
+            super.addDirtyRegion(c, x, y, w, h);
+        }
+    }
+}

src/main/java/org/pbjar/jxlayer/plaf/ext/transform/TransformRPMImpl.java

@@ -0,0 +1,197 @@
+/*
+  Copyright (c) 2009, Piet Blok
+  All rights reserved.
+  <p>
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+  <p>
+  * Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+  * Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the following
+  disclaimer in the documentation and/or other materials provided
+  with the distribution.
+  * Neither the name of the copyright holder nor the names of the
+  contributors may be used to endorse or promote products derived
+  from this software without specific prior written permission.
+  <p>
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.pbjar.jxlayer.plaf.ext.transform;
+
+import com.weis.darklaf.LogFormatter;
+import org.jdesktop.jxlayer.JXLayer;
+import org.jdesktop.jxlayer.plaf.LayerUI;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.pbjar.jxlayer.plaf.ext.TransformUI;
+
+import javax.swing.*;
+import java.awt.*;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.util.logging.ConsoleHandler;
+import java.util.logging.Logger;
+
+/**
+ * To avoid duplicate code, this class implements the actual logic for {@link TransformRPMSwingX}
+ * and {@link TransformRPMFallBack}.
+ *
+ * @author Piet Blok
+ */
+public final class TransformRPMImpl {
+
+    private static final Logger LOGGER = Logger.getLogger(TransformRPMImpl.class.getName());
+    /**
+     * A flag, indicating whether or not a very dirty initialization on created {@link
+     * RepaintManager}s must be performed.
+     *
+     * @see #hackInitialization(RepaintManager, RepaintManager)
+     */
+    public static boolean hack = false;
+
+    static {
+        LOGGER.setUseParentHandlers(false);
+        ConsoleHandler handler = new ConsoleHandler();
+        handler.setFormatter(new LogFormatter());
+        LOGGER.addHandler(handler);
+    }
+
+    private TransformRPMImpl() {
+    }
+
+    /**
+     * Searches upwards in the component hierarchy for a {@link JXLayer} ancestor with an enabled
+     * {@link TransformUI}.
+     * <p>
+     * If found, the dirty rectangle is transformed to a rectangle targeted at that {@link JXLayer}
+     * and the argument manager's {@link RepaintManager#addDirtyRegion(JComponent, int, int, int,
+     * int)} is invoked. {@code true} is returned.
+     * </p>
+     * <p>
+     * Else, (@code false} is returned.
+     * </p>
+     *
+     * @param aComponent a component
+     * @param x          the X of the dirty region
+     * @param y          the Y of the dirty region
+     * @param w          the width of the dirty region
+     * @param h          the height of the dirty region
+     * @param manager    the current {@link RepaintManager}
+     * @return {@code true} if the call is delegated to the manager with a transformed rectangle,
+     * {@code false} otherwise
+     */
+    @SuppressWarnings("unchecked")
+    public static boolean addDirtyRegion(@NotNull final JComponent aComponent, final int x, final int y,
+                                         final int w, final int h, @NotNull final RepaintManager manager) {
+        if (aComponent.isShowing()) {
+            JXLayer<?> layer = findJXLayer(aComponent);
+            if (layer != null) {
+                LayerUI<?> layerUI = layer.getUI();
+                TransformUI ui = (TransformUI) layerUI;
+                Point point = aComponent.getLocationOnScreen();
+                SwingUtilities.convertPointFromScreen(point, layer);
+                Rectangle transformPortRegion = ui.transform(new Rectangle(x + point.x, y + point.y, w, h),
+                                                             (JXLayer<JComponent>) layer);
+                manager.addDirtyRegion(layer,
+                                       transformPortRegion.x, transformPortRegion.y,
+                                       transformPortRegion.width, transformPortRegion.height);
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * If {@link #hack} is {@code true}, the private fields {@code paintManager} and {@code
+     * bufferStrategyType} are copied via reflection from the source manager into the destination
+     * manager.
+     *
+     * @param sourceManager      the source manager
+     * @param destinationManager the destination manager
+     */
+    public static void hackInitialization(final RepaintManager sourceManager,
+                                          final RepaintManager destinationManager) {
+        if (hack) {
+            Class<RepaintManager> rpmClass = RepaintManager.class;
+            try {
+
+                Field fieldBufferStrategyType = rpmClass.getDeclaredField("bufferStrategyType");
+                Field fieldPaintManager = rpmClass.getDeclaredField("paintManager");
+                Method methodGetPaintManager = rpmClass.getDeclaredMethod("getPaintManager");
+
+                fieldBufferStrategyType.setAccessible(true);
+                fieldPaintManager.setAccessible(true);
+                methodGetPaintManager.setAccessible(true);
+
+                Object paintManager = methodGetPaintManager.invoke(sourceManager);
+                short bufferStrategyType = (Short) fieldBufferStrategyType.get(sourceManager);
+
+                fieldBufferStrategyType.set(destinationManager, bufferStrategyType);
+                fieldPaintManager.set(destinationManager, paintManager);
+
+                fieldBufferStrategyType.setAccessible(false);
+                fieldPaintManager.setAccessible(false);
+                methodGetPaintManager.setAccessible(false);
+
+                LOGGER.warning("Copied paintManager of type: " + paintManager.getClass().getName());
+                switch (bufferStrategyType) {
+                    case (0):
+                        LOGGER.warning("Copied bufferStrategyType "
+                                               + bufferStrategyType
+                                               + ": BUFFER_STRATEGY_NOT_SPECIFIED");
+                        break;
+                    case (1):
+                        LOGGER.warning("Copied bufferStrategyType "
+                                               + bufferStrategyType
+                                               + ": BUFFER_STRATEGY_SPECIFIED_ON");
+                        break;
+                    case (2):
+                        LOGGER.warning("Copied bufferStrategyType "
+                                               + bufferStrategyType
+                                               + ": BUFFER_STRATEGY_SPECIFIED_OFF");
+                        break;
+                    default:
+                        LOGGER.warning("Copied bufferStrategyType "
+                                               + bufferStrategyType + ": ???");
+                        break;
+                }
+            } catch (Throwable t) {
+                t.printStackTrace(System.out);
+            }
+        }
+    }
+
+    /**
+     * Find the first ancestor {@link JXLayer} with an enabled {@link TransformUI}.
+     *
+     * @param aComponent some component
+     * @return a {@link JXLayer} instance or {@code null}
+     */
+    @Nullable
+    private static JXLayer<?> findJXLayer(final JComponent aComponent) {
+
+        JXLayer<?> layer = (JXLayer<?>) SwingUtilities.getAncestorOfClass(
+                JXLayer.class, aComponent);
+        if (layer != null) {
+            LayerUI<?> ui = ((JXLayer<?>) layer).getUI();
+            if (ui instanceof TransformUI) {
+                return layer;
+            }
+            return findJXLayer(layer);
+        }
+        return null;
+    }
+}

src/main/java/org/pbjar/jxlayer/plaf/ext/transform/TransformRPMSwingX.java

@@ -0,0 +1,76 @@
+/*
+ Copyright (c) 2009, Piet Blok
+ All rights reserved.
+ <p>
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ <p>
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the following
+ disclaimer in the documentation and/or other materials provided
+ with the distribution.
+ * Neither the name of the copyright holder nor the names of the
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+ <p>
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package org.pbjar.jxlayer.plaf.ext.transform;
+
+import org.jdesktop.swingx.ForwardingRepaintManager;
+import org.jetbrains.annotations.NotNull;
+import org.pbjar.jxlayer.repaint.RepaintManagerProvider;
+import org.pbjar.jxlayer.repaint.RepaintManagerUtils;
+
+import javax.swing.*;
+
+/**
+ * A specialized {@link RepaintManager} that checks for every JComponent that is being set dirty, if
+ * it has a JXLayer ancestor, equipped with a TransformUI. In that case, the transformed region on
+ * the JXLayer is also marked dirty.
+ *
+ * <p>If this class cannot be instantiated because the SwingX packages are not on the class path,
+ * use {@link TransformRPMFallBack}
+ *
+ * @author Piet Blok
+ * @see TransformRPMFallBack
+ * @see RepaintManagerProvider
+ * @see RepaintManagerUtils
+ */
+@TransformRPMAnnotation
+public class TransformRPMSwingX extends ForwardingRepaintManager {
+
+    /**
+     * Sole constructor.
+     *
+     * @param delegate the delegate {@link RepaintManager}
+     */
+    public TransformRPMSwingX(@NotNull final RepaintManager delegate) {
+        super(delegate);
+        TransformRPMImpl.hackInitialization(delegate, this);
+    }
+
+    /**
+     * Delegates and then marks a JXLayer ancestor as dirty with the transformed rectangle.
+     */
+    @Override
+    public void addDirtyRegion(@NotNull final JComponent c, final int x, final int y, final int w, final int h) {
+        if (!TransformRPMImpl.addDirtyRegion(c, x, y, w, h, this)) {
+            super.addDirtyRegion(c, x, y, w, h);
+        }
+    }
+}

src/main/java/org/pbjar/jxlayer/plaf/ext/transform/TransformUtils.java

@@ -0,0 +1,122 @@
+/*
+ Copyright (c) 2009, Piet Blok
+ All rights reserved.
+ <p>
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ <p>
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the following
+ disclaimer in the documentation and/or other materials provided
+ with the distribution.
+ * Neither the name of the copyright holder nor the names of the
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+ <p>
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package org.pbjar.jxlayer.plaf.ext.transform;
+
+import org.jdesktop.jxlayer.JXLayer;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+import org.pbjar.jxlayer.plaf.ext.TransformUI;
+
+import javax.swing.*;
+import java.awt.*;
+import java.util.Map;
+
+/**
+ * Some convenience methods to create a populated transforming {@link JXLayer}.
+ *
+ * @author Piet Blok
+ */
+public final class TransformUtils {
+
+    @Contract(pure = true)
+    private TransformUtils() {
+    }
+
+    /**
+     * Create a Transform JXLayer.
+     *
+     * @param component the component.
+     * @return the JXLayer.
+     */
+    @NotNull
+    public static JXLayer<JComponent> createTransformJXLayer(final JComponent component) {
+        return createTransformJXLayer(component, 1.0, null);
+    }
+
+    /**
+     * Create a Transform JXLayer.
+     *
+     * @param component the component.
+     * @param scale     the scaling
+     * @param hints     the rendering hints.
+     * @return the JXLayer.
+     */
+    @NotNull
+    public static JXLayer<JComponent> createTransformJXLayer(
+            final JComponent component, final double scale, final Map<RenderingHints.Key, Object> hints) {
+        DefaultTransformModel model = new DefaultTransformModel();
+        model.setScale(scale);
+        return createTransformJXLayer(component, model, hints);
+    }
+
+    /**
+     * Create a Transform JXLayer.
+     *
+     * @param component the component.
+     * @param model     the transform model.
+     * @param hints     the rendering hints.
+     * @return the JXLayer.
+     */
+    @Contract("_, _, _ -> new")
+    @NotNull
+    public static JXLayer<JComponent> createTransformJXLayer(
+            final JComponent component, final TransformModel model, final Map<RenderingHints.Key, Object> hints) {
+        TransformUI ui = new TransformUI(model);
+        ui.setRenderingHints(hints);
+        return new JXLayer<>(component, ui);
+    }
+
+    /**
+     * Create a Transform JXLayer.
+     *
+     * @param component the component.
+     * @param scale     the scaling
+     * @return the JXLayer.
+     */
+    @NotNull
+    public static JXLayer<JComponent> createTransformJXLayer(final JComponent component, final double scale) {
+        return createTransformJXLayer(component, scale, null);
+    }
+
+    /**
+     * Create a Transform JXLayer.
+     *
+     * @param component the component.
+     * @param model     the transform model.
+     * @return the JXLayer.
+     */
+    @NotNull
+    public static JXLayer<JComponent> createTransformJXLayer(
+            final JComponent component, final TransformModel model) {
+        return createTransformJXLayer(component, model, null);
+    }
+}

src/main/java/org/pbjar/jxlayer/repaint/RepaintManagerProvider.java

@@ -0,0 +1,76 @@
+/*
+ Copyright (c) 2009, Piet Blok
+ All rights reserved.
+ <p>
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ <p>
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the following
+ disclaimer in the documentation and/or other materials provided
+ with the distribution.
+ * Neither the name of the copyright holder nor the names of the
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+ <p>
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package org.pbjar.jxlayer.repaint;
+
+import org.jdesktop.swingx.ForwardingRepaintManager;
+import org.jetbrains.annotations.NotNull;
+
+import javax.swing.*;
+
+/**
+ * To be implemented by classes that provide for a custom RepaintManager.
+ *
+ * @author Piet Blok
+ * @see RepaintManagerUtils
+ */
+public interface RepaintManagerProvider {
+    /**
+     * Get the class of a {@link RepaintManager} that extends {@link ForwardingRepaintManager}.
+     *
+     * <p><b>Note:</b> the class must provide for a public constructor that takes a delegate {@link
+     * RepaintManager} as its only argument.
+     *
+     * @return a class object
+     */
+    @NotNull
+    Class<? extends ForwardingRepaintManager> getForwardingRepaintManagerClass();
+
+    /**
+     * Get the class of a {@link RepaintManager} that extends {@link WrappedRepaintManager}.
+     *
+     * <p><b>Note:</b> the class must provide for a public constructor that takes a delegate {@link
+     * RepaintManager} as its only argument.
+     *
+     * @return a class object
+     */
+    @NotNull
+    Class<? extends WrappedRepaintManager> getWrappedRepaintManagerClass();
+
+    /**
+     * Checks whether or not the argument class is a {@link RepaintManager} class that will do the
+     * required job.
+     *
+     * @param rpm a {@link RepaintManager} class
+     * @return {@code true} if the argument class will do the required job, {@code false} otherwise
+     */
+    boolean isAdequate(Class<? extends RepaintManager> rpm);
+}

src/main/java/org/pbjar/jxlayer/repaint/RepaintManagerUtils.java

@@ -0,0 +1,230 @@
+/*
+ Copyright (c) 2009, Piet Blok
+ All rights reserved.
+ <p>
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ <p>
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the following
+ disclaimer in the documentation and/or other materials provided
+ with the distribution.
+ * Neither the name of the copyright holder nor the names of the
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+ <p>
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package org.pbjar.jxlayer.repaint;
+
+import com.weis.darklaf.LogFormatter;
+import org.jdesktop.swingx.ForwardingRepaintManager;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.util.logging.ConsoleHandler;
+import java.util.logging.Logger;
+
+/**
+ * Utility class that ensures that a correct {@link RepaintManager} is set.
+ *
+ * @author Piet Blok
+ */
+public final class RepaintManagerUtils {
+
+    private static final Logger LOGGER = Logger.getLogger(RepaintManagerUtils.class.getName());
+    /**
+     * Indicates the availability of SwingX on the class path.
+     */
+    private static final boolean swingX = isSwingXAvailable();
+
+    static {
+        LOGGER.setUseParentHandlers(false);
+        ConsoleHandler handler = new ConsoleHandler();
+        handler.setFormatter(new LogFormatter());
+        LOGGER.addHandler(handler);
+    }
+
+    @Contract(pure = true)
+    private RepaintManagerUtils() {
+    }
+
+    /**
+     * Create and return an {@link Action} that will display the delegate structure of the current
+     * {@link RepaintManager}.
+     *
+     * @return an {@link Action} object
+     */
+    @Contract(" -> new")
+    @NotNull
+    public static Action createRPDisplayAction() {
+        return new DisplayAction();
+    }
+
+    /**
+     * Ensure that a specific {@link RepaintManager} is set according to the requirements of the
+     * {@link RepaintManagerProvider}.
+     *
+     * @param c        a component from which the current repaint manager can be obtained.
+     * @param provider the provider
+     */
+    public static void ensureRepaintManagerSet(
+            final Component c, @NotNull final RepaintManagerProvider provider) {
+        ensureImpl(RepaintManager.currentManager(c), provider);
+    }
+
+    /**
+     * The actual implementation of ensure.
+     *
+     * @param delegate a delegate RepaintManager
+     * @param provider the provider that provides for the type and implementation of a delegated
+     *                 RepaintManager
+     */
+    private static void ensureImpl(
+            @NotNull final RepaintManager delegate, @NotNull final RepaintManagerProvider provider) {
+        /*
+         * Setup a traversal variable.
+         */
+        RepaintManager manager = delegate;
+
+        while (!provider.isAdequate(manager.getClass())) {
+            if (swingX) {
+                if (manager instanceof ForwardingRepaintManager) {
+                    manager = ((ForwardingRepaintManager) manager).getDelegateManager();
+                } else {
+                    RepaintManager.setCurrentManager(
+                            createManager(provider.getForwardingRepaintManagerClass(), delegate));
+                    break;
+                }
+            } else {
+                if (manager instanceof WrappedRepaintManager) {
+                    manager = ((WrappedRepaintManager) manager).getDelegateManager();
+                } else {
+                    RepaintManager.setCurrentManager(
+                            createManager(provider.getWrappedRepaintManagerClass(), delegate));
+                    break;
+                }
+            }
+        }
+    }
+
+    @NotNull
+    private static RepaintManager createManager(
+            @NotNull final Class<? extends RepaintManager> clazz, final RepaintManager delegate) {
+        try {
+            RepaintManager newManager = clazz.getConstructor(RepaintManager.class).newInstance(delegate);
+            System.out.println("Created " + newManager.getClass().getName());
+            return newManager;
+        } catch (Throwable t) {
+            throw new RuntimeException("Cannot instantiate " + clazz.getName(), t);
+        }
+    }
+
+    /**
+     * Ensure that a specific {@link RepaintManager} is set according to the requirements of the
+     * {@link RepaintManagerProvider}.
+     *
+     * @param c        a component from which the current repaint manager can be obtained.
+     * @param provider the provider
+     */
+    public static void ensureRepaintManagerSet(
+            final JComponent c, @NotNull final RepaintManagerProvider provider) {
+        ensureImpl(RepaintManager.currentManager(c), provider);
+    }
+
+    /**
+     * Detect the availability of the ForwardingRepaintManager class.
+     *
+     * @return {@code} true if available, {@code false} otherwise
+     */
+    private static boolean isSwingXAvailable() {
+        try {
+            Class<?> clazz = ForwardingRepaintManager.class;
+            LOGGER.info("SwingX is available");
+            return clazz != null;
+        } catch (Throwable t) {
+            LOGGER.info("SwingX is not available");
+            return false;
+        }
+    }
+
+    private static class DisplayAction extends AbstractAction {
+
+        private static final long serialVersionUID = 1L;
+
+        public DisplayAction() {
+            super("RPM tree");
+        }
+
+        @Override
+        public void actionPerformed(@NotNull final ActionEvent e) {
+            JComponent c = (JComponent) e.getSource();
+            StringWriter sw = new StringWriter();
+            PrintWriter pw = new PrintWriter(sw);
+            pw.println("The tree for the current RepaintManager:");
+            pw.println();
+            RepaintManager manager = RepaintManager.currentManager(c);
+            appendDelegates(pw, manager);
+            pw.close();
+            String text = sw.toString();
+            JTextPane message = new JTextPane();
+            message.setFont(Font.decode(Font.MONOSPACED));
+            message.setContentType("text/plain");
+            message.setText(text);
+            message.setEditable(false);
+            JOptionPane.showMessageDialog(
+                    c, message, "The RepaintManager tree", JOptionPane.INFORMATION_MESSAGE);
+        }
+
+        private void appendClass(@NotNull final PrintWriter writer, @NotNull final Object obj) {
+            Class<?> clazz = obj.getClass();
+            String prefix = "Class:   ";
+            while (clazz != null) {
+                writer.println(prefix + clazz.getName());
+                clazz = clazz.getSuperclass();
+                prefix = "Extends: ";
+            }
+        }
+
+        private void appendDelegates(@NotNull final PrintWriter writer, @NotNull final Object rp) {
+            appendClass(writer, rp);
+            @Nullable RepaintManager delegate;
+            if (rp instanceof WrappedRepaintManager) {
+                delegate = ((WrappedRepaintManager) rp).getDelegateManager();
+            } else if (swingX) {
+                if (rp instanceof ForwardingRepaintManager) {
+                    delegate = ((ForwardingRepaintManager) rp).getDelegateManager();
+                } else {
+                    delegate = null;
+                }
+            } else {
+                delegate = null;
+            }
+            if (delegate != null) {
+                writer.println();
+                writer.println("Delegate:");
+                appendDelegates(writer, delegate);
+            }
+        }
+    }
+}

src/main/java/org/pbjar/jxlayer/repaint/WrappedRepaintManager.java

@@ -0,0 +1,228 @@
+/*
+ Copyright (c) 2009, Piet Blok
+ All rights reserved.
+ <p>
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ <p>
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the following
+ disclaimer in the documentation and/or other materials provided
+ with the distribution.
+ * Neither the name of the copyright holder nor the names of the
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+ <p>
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package org.pbjar.jxlayer.repaint;
+
+import org.jdesktop.swingx.ForwardingRepaintManager;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import javax.swing.*;
+import java.applet.Applet;
+import java.awt.*;
+
+/**
+ * A fall back class for when the SwingX class {@link ForwardingRepaintManager} is not available on
+ * the class path.
+ *
+ * <p>A {@link RepaintManager} that preserves functionality of a wrapped {@code RepaintManager}. All
+ * methods will delegate to the wrapped {@code RepaintManager}.
+ *
+ * <p>When sub classing this class, one must in all overridden methods call the {@code super}
+ * method.
+ *
+ * @author Piet Blok
+ * @see RepaintManagerUtils
+ * @see RepaintManagerProvider
+ * @see ForwardingRepaintManager
+ */
+public class WrappedRepaintManager extends RepaintManager {
+
+    /**
+     * The wrapped manager.
+     */
+    @NotNull
+    private final RepaintManager delegate;
+
+    /**
+     * Construct a {@code RepaintManager} wrapping an existing {@code RepaintManager}.
+     *
+     * @param delegate an existing RepaintManager
+     */
+    @Contract("null -> fail")
+    public WrappedRepaintManager(@Nullable final RepaintManager delegate) {
+        if (delegate == null) {
+            throw new NullPointerException();
+        }
+        this.delegate = delegate;
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public void addInvalidComponent(final JComponent invalidComponent) {
+        delegate.addInvalidComponent(invalidComponent);
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public void removeInvalidComponent(final JComponent component) {
+        delegate.removeInvalidComponent(component);
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public void addDirtyRegion(final JComponent c, final int x, final int y, final int w, final int h) {
+        delegate.addDirtyRegion(c, x, y, w, h);
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public void addDirtyRegion(final Window window, final int x, final int y, final int w, final int h) {
+        delegate.addDirtyRegion(window, x, y, w, h);
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    @Deprecated
+    @SuppressWarnings("deprecation")
+    public void addDirtyRegion(final Applet applet, final int x, final int y, final int w, final int h) {
+        delegate.addDirtyRegion(applet, x, y, w, h);
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public Rectangle getDirtyRegion(final JComponent c) {
+        return delegate.getDirtyRegion(c);
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public Dimension getDoubleBufferMaximumSize() {
+        return delegate.getDoubleBufferMaximumSize();
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public void markCompletelyDirty(final JComponent c) {
+        delegate.markCompletelyDirty(c);
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public void setDoubleBufferMaximumSize(final Dimension d) {
+        delegate.setDoubleBufferMaximumSize(d);
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public void markCompletelyClean(final JComponent c) {
+        delegate.markCompletelyClean(c);
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public boolean isCompletelyDirty(final JComponent c) {
+        return delegate.isCompletelyDirty(c);
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public void validateInvalidComponents() {
+        delegate.validateInvalidComponents();
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public void paintDirtyRegions() {
+        delegate.paintDirtyRegions();
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public boolean isDoubleBufferingEnabled() {
+        return delegate.isDoubleBufferingEnabled();
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public Image getOffscreenBuffer(final Component c, final int proposedWidth, final int proposedHeight) {
+        return delegate.getOffscreenBuffer(c, proposedWidth, proposedHeight);
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public void setDoubleBufferingEnabled(final boolean flag) {
+        delegate.setDoubleBufferingEnabled(flag);
+    }
+
+    /**
+     * Just delegates. {@inheritDoc}
+     */
+    @Override
+    public Image getVolatileOffscreenBuffer(final Component c, final int proposedWidth, final int proposedHeight) {
+        return delegate.getVolatileOffscreenBuffer(c, proposedWidth, proposedHeight);
+    }
+
+    /**
+     * Get the delegate.
+     *
+     * @return the delegate
+     */
+    @Nullable
+    public RepaintManager getDelegateManager() {
+        return delegate;
+    }
+
+
+}

src/main/resources/com/weis/darklaf/properties/ui/splitPane.properties

@@ -22,10 +22,12 @@
 #
 # suppress inspection "UnusedProperty" for whole file
 SplitPaneUI                          = com.weis.darklaf.ui.splitpane.DarkSplitPaneUI
+SplitPane.border                     = com.weis.darklaf.ui.splitpane.DarkSplitPaneBorder
 SplitPaneDivider.border              = com.weis.darklaf.ui.splitpane.DarkSplitPaneDividerBorder
 SplitPane.highlight                  = %background
 SplitPane.dividerLineColor           = %border
 SplitPane.dividerFocusColor          = null
+SplitPane.centerOneTouchButtons      = true
 
 #Icons
 SplitPane.horizontalGlue.icon        = navigation/horizontalGlue.svg[aware](4,13)

src/main/resources/com/weis/darklaf/properties/ui/tabFrame.properties

@@ -0,0 +1,63 @@
+#
+# MIT License
+#
+# Copyright (c) 2019 Jannis Weis
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+#
+# suppress inspection "UnusedProperty" for whole file
+TabFramePanelPopupUI                             = com.weis.darklaf.ui.tabframe.DarkPanelPopupUI
+TabFrameTabbedPopupUI                            = com.weis.darklaf.ui.tabframe.DarkTabbedPopupUI
+TabFramePopup.headerBorder                       = com.weis.darklaf.ui.tabframe.DarkTabFramePopupHeaderBorder
+
+TabFramePopup.headerBackground                   = %background
+TabFramePopup.headerFocusBackground              = %backgroundColorful
+TabFramePopup.headerHoverBackground              = %backgroundHover
+TabFramePopup.headerSelectedBackground           = %background
+TabFramePopup.headerSelectedHoverBackground      = %backgroundHover
+TabFramePopup.headerFocusHoverBackground         = %backgroundHoverColorful
+TabFramePopup.headerFocusSelectedBackground      = %backgroundColorful
+TabFramePopup.headerFocusSelectedHoverBackground = %backgroundHoverColorful
+TabFramePopup.headerButtonHoverBackground        = %hoverHighlight
+TabFramePopup.headerButtonClickBackground        = %clickHighlight
+TabFramePopup.headerButtonFocusHoverBackground   = %hoverHighlightColorful
+TabFramePopup.headerButtonFocusClickBackground   = %clickHighlightColorful
+
+TabFramePopup.closeAccelerator                   = shift pressed ESCAPE
+TabFramePopup.closeTooltipText                   = Close (shift ESC)
+
+TabFramePopup.minimumHeaderSize                  = null
+
+TabFramePopup.borderColor                        = %borderSecondary
+
+TabFrameTabLabelUI                               = com.weis.darklaf.ui.tabframe.DarkTabFrameTabLabelUI
+TabFrameTabContainerUI                           = com.weis.darklaf.ui.tabframe.DarkTabFrameTabContainerUI
+TabFrameTab.border                               = com.weis.darklaf.ui.tabframe.DarkTabFrameTabBorder
+TabFrameTab.font                                 = Dialog-0-11
+TabFrameTab.foreground                           = %textForeground
+TabFrameTab.selectedForeground                   = %textForegroundHighlight
+TabFrameTab.selectedBackground                   = %backgroundSelectedSecondary
+TabFrameTab.hoverBackground                      = %backgroundHoverSecondary
+
+TabFrameUI                                       = com.weis.darklaf.ui.tabframe.DarkTabFrameUI
+TabFrame.line                                    = %borderSecondary
+TabFrame.tabHeight                               = 24
+TabFrame.acceleratorKeyCode                      = alt pressed
+#Icons
+TabFramePopup.close.icon                         = navigation/collapse.svg[aware]

src/main/resources/com/weis/darklaf/properties/ui/tabbedPane.properties

@@ -21,34 +21,34 @@
 #SOFTWARE.
 #
 # suppress inspection "UnusedProperty" for whole file
-TabbedPaneUI                    = com.weis.darklaf.ui.tabbedpane.DarkTabbedPaneUI
-TabbedPane.tabInsets            = 5,7,5,7
-TabbedPane.tabRunOverlay        = 0
+TabbedPaneUI                       = com.weis.darklaf.ui.tabbedpane.DarkTabbedPaneUI
+TabbedPane.tabInsets               = 5,7,5,7
+TabbedPane.tabRunOverlay           = 0
 
-TabbedPane.tabBorderColor       = %borderSecondary
-TabbedPane.accent               = %highlightFillMono
-TabbedPane.accentFocus          = %highlightFillFocusSecondary
-TabbedPane.selected             = %backgroundSelected
-TabbedPane.focus                = %backgroundSelected
-TabbedPane.highlight            = %backgroundHover
-TabbedPane.selectHighlight      = %hoverHighlightSecondary
+TabbedPane.tabBorderColor          = %borderSecondary
+TabbedPane.accent                  = %highlightFillMono
+TabbedPane.accentFocus             = %highlightFillFocusSecondary
+TabbedPane.selectedBackground      = %backgroundSelected
+TabbedPane.focus                   = %backgroundSelected
+TabbedPane.hoverBackground         = %backgroundHover
+TabbedPane.selectedHoverBackground = %hoverHighlightSecondary
 
-TabbedPane.focusBarHeight       = 3
-TabbedPane.contentBorderInsets  = 0,0,0,0
+TabbedPane.focusBarHeight          = 3
+TabbedPane.contentBorderInsets     = 0,0,0,0
 
-TabbedPane.maxPopupHeight       = 500
-TabbedPane.dropFill             = %dropBackground
-TabbedPane.dragBorderColor      = %borderTertiary
+TabbedPane.maxPopupHeight          = 500
+TabbedPane.dropFill                = %dropBackground
+TabbedPane.dragBorderColor         = %borderTertiary
 
-TabbedPane.tabsOpaque           = true
-TabbedPane.tabsOverlapBorder    = false
-TabbedPane.labelShift           = 0
-TabbedPane.selectedLabelShift   = 0
-TabbedPane.selectedTabPadInsets = 0,0,0,0
-TabbedPane.tabAreaInsets        = 0,0,0,0
+TabbedPane.tabsOpaque              = true
+TabbedPane.tabsOverlapBorder       = false
+TabbedPane.labelShift              = 0
+TabbedPane.selectedLabelShift      = 0
+TabbedPane.selectedTabPadInsets    = 0,0,0,0
+TabbedPane.tabAreaInsets           = 0,0,0,0
 
 #Icons
-TabbedPane.newTab.icon          = navigation/add.svg[aware]
-TabbedPane.moreTabs.icon        = navigation/moreTabs.svg[aware]
-TabbedPane.tabCloseIcon         = navigation/close.svg[aware]
-TabbedPane.tabCloseHoverIcon    = navigation/closeHovered.svg[aware]
+TabbedPane.newTab.icon             = navigation/add.svg[aware]
+TabbedPane.moreTabs.icon           = navigation/moreTabs.svg[aware]
+TabbedPane.tabCloseIcon            = navigation/close.svg[aware]
+TabbedPane.tabCloseHoverIcon       = navigation/closeHovered.svg[aware]

src/main/resources/com/weis/darklaf/theme/darcula/darcula_defaults.properties

@@ -30,9 +30,10 @@ backgroundToolTip                = 4b4d4d
 
 backgroundHover                  = 27292a
 backgroundSelected               = 4e5254
-#Todo for tabFrame.
 backgroundHoverSecondary         = 353739
 backgroundSelectedSecondary      = 2d2f30
+backgroundHoverColorful          = 262D36
+backgroundSelectedColorful       = 313A45
 
 dropBackground                   = 4b4b4b
 dropForeground                   = 999999
@@ -48,7 +49,7 @@ gridLine                         = 4f5152
 hoverHighlight                   = 4c5052
 clickHighlight                   = 5c6164
 
-hoverHighlightColorful           = 262E37
+hoverHighlightColorful           = 2F3A45
 clickHighlightColorful           = 2B353F
 
 hoverHighlightDefault            = 406086
@@ -89,6 +90,7 @@ controlPassedFadeEnd             = 5dc48f
 ####Text####
 caret                            = bbbbbb
 textForeground                   = bbbbbb
+textForegroundHighlight          = DDDDDD
 textForegroundInactive           = 777777
 textForegroundSecondary          = 919191
 acceleratorForeground            = eeeeee

src/test/java/SplitPaneDemo.java

@@ -1,5 +1,4 @@
 import com.weis.darklaf.LafManager;
-import com.weis.darklaf.theme.Theme;
 
 import javax.swing.*;
 import java.awt.*;
@@ -19,6 +18,7 @@ public final class SplitPaneDemo {
             splitPane.setRightComponent(new JPanel() {{
                 setBackground(Color.BLUE);
             }});
+            splitPane.putClientProperty("JSplitPane.style", "invisible");
             splitPane.putClientProperty("JSplitPane.style", "line");
             splitPane.setOneTouchExpandable(true);
             frame.setContentPane(new JPanel(new BorderLayout()) {{

src/test/java/TabFrameDemo.java

@@ -0,0 +1,86 @@
+import com.weis.darklaf.LafManager;
+import com.weis.darklaf.components.alignment.Alignment;
+import com.weis.darklaf.components.tabframe.TabFrame;
+import com.weis.darklaf.components.tabframe.TabbedPopup;
+import com.weis.darklaf.icons.IconLoader;
+
+import javax.swing.*;
+import javax.swing.border.EmptyBorder;
+import java.awt.*;
+
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+public class TabFrameDemo {
+
+    public static void main(final String[] args) {
+        SwingUtilities.invokeLater(() -> {
+            LafManager.install();
+
+            final JFrame frame = new JFrame();
+            Icon folderIcon = IconLoader.get().getUIAwareIcon("files/folder.svg", 19, 19);
+
+            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+            var tabFrame = new TabFrame();
+            for (var o : Alignment.values()) {
+                if (o != Alignment.CENTER) {
+                    for (int i = 0; i < 2; i++) {
+                        var pcc = new JPanel();
+                        pcc.setOpaque(true);
+                        pcc.setBackground(Color.YELLOW.darker().darker());
+                        pcc.add(new JLabel(o.toString() + "_" + i + " Popup"));
+                        tabFrame.addTab(pcc, o.toString() + "_" + i, folderIcon, o);
+                    }
+                }
+            }
+            var tabbedPopup = new TabbedPopup("Tabbed Popup:");
+            tabFrame.setTabAt(tabbedPopup, "NORTH (Tabbed Pane Tab)", null, Alignment.NORTH, 0);
+            for (int i = 0; i < 5; i++) {
+                var panel = new JPanel();
+                var label = new JLabel("inside tab " + i);
+                panel.add(label);
+                panel.setBackground(Color.GREEN.darker().darker());
+                tabbedPopup.getTabbedPane().addTab("Tab " + i, panel);
+            }
+
+            tabFrame.setUserTabComponentAt(new JLabel("NORTH (custom tab)") {{
+                setBorder(new EmptyBorder(0, 5, 0, 5));
+                setOpaque(false);
+                setForeground(Color.RED);
+                setFont(new Font(Font.SERIF, Font.ITALIC, 12));
+            }}, Alignment.NORTH, 1);
+
+            tabFrame.setAcceleratorAt(1, Alignment.NORTH_WEST, 0);
+
+            var contentPane = new JPanel(new BorderLayout());
+            frame.setContentPane(tabFrame);
+            tabFrame.setContent(contentPane);
+
+            frame.pack();
+            frame.setSize(1000, 500);
+            frame.setLocationRelativeTo(null);
+            frame.setVisible(true);
+        });
+    }
+}