Made decorations creation process more flexible and independent of the platform specific implementation.

Signed-off-by: weisj <weisj@arcor.de>

core/src/main/java/com/github/weisj/darklaf/DarkLaf.java

@@ -24,11 +24,11 @@
 package com.github.weisj.darklaf;
 
 import com.github.weisj.darklaf.components.border.DarkBorders;
-import com.github.weisj.darklaf.platform.windows.JNIDecorations;
+import com.github.weisj.darklaf.decorations.JNIDecorations;
+import com.github.weisj.darklaf.platform.SystemInfo;
 import com.github.weisj.darklaf.theme.Theme;
 import com.github.weisj.darklaf.ui.popupmenu.DarkPopupMenuUI;
 import com.github.weisj.darklaf.util.PropertyLoader;
-import com.github.weisj.darklaf.platform.SystemInfo;
 import sun.awt.AppContext;
 
 import javax.swing.*;
@@ -55,7 +55,6 @@ public class DarkLaf extends BasicLookAndFeel implements PropertyChangeListener
 
     private static final Logger LOGGER = Logger.getLogger(DarkLaf.class.getName());
     private static final String NAME = "Darklaf";
-    private static boolean decorationsEnabled = true;
     private final BasicLookAndFeel base;
 
     /**
@@ -77,22 +76,6 @@ public class DarkLaf extends BasicLookAndFeel implements PropertyChangeListener
     }
 
 
-    public static boolean isDecorationsEnabled() {
-        return LafManager.getTheme().useCustomDecorations() && decorationsEnabled;
-    }
-
-    public static void setDecorationsEnabled(final boolean decorationsEnabled) {
-        if (DarkLaf.decorationsEnabled != decorationsEnabled) {
-            DarkLaf.decorationsEnabled = decorationsEnabled;
-            if (decorationsEnabled) {
-                boolean update = JNIDecorations.updateLibrary();
-                if (update) {
-                    LafManager.updateLaf();
-                }
-            }
-        }
-    }
-
     @Override
     public UIDefaults getDefaults() {
         try {
@@ -104,10 +87,9 @@ public class DarkLaf extends BasicLookAndFeel implements PropertyChangeListener
             initInputMapDefaults(defaults);
             loadThemeDefaults(defaults);
             initIdeaDefaults(defaults);
-            patchComboBox(metalDefaults, defaults);
 
-            JFrame.setDefaultLookAndFeelDecorated(true);
-            JDialog.setDefaultLookAndFeelDecorated(true);
+            patchComboBox(metalDefaults, defaults);
+            setupDecorations();
 
             return defaults;
         } catch (final Exception e) {
@@ -116,6 +98,12 @@ public class DarkLaf extends BasicLookAndFeel implements PropertyChangeListener
         return super.getDefaults();
     }
 
+    private void setupDecorations() {
+        JNIDecorations.updateLibrary();
+        JFrame.setDefaultLookAndFeelDecorated(true);
+        JDialog.setDefaultLookAndFeelDecorated(true);
+    }
+
     protected void adjustPlatformSpecifics(final Properties uiProps) {
         boolean useScreenMenuBar = Boolean.getBoolean("apple.laf.useScreenMenuBar");
         // If user wants to use Apple menu bar, then we need to keep the default
@@ -184,7 +172,6 @@ public class DarkLaf extends BasicLookAndFeel implements PropertyChangeListener
 
         StyleSheet styleSheet = currentTheme.loadStyleSheet();
         new HTMLEditorKit().setStyleSheet(styleSheet);
-        setDecorationsEnabled(currentTheme.useCustomDecorations());
     }
 
     @SuppressWarnings({"HardCodedStringLiteral"})
@@ -388,7 +375,8 @@ public class DarkLaf extends BasicLookAndFeel implements PropertyChangeListener
 
     @Override
     public boolean getSupportsWindowDecorations() {
-        return LafManager.getTheme().useCustomDecorations()
+        return LafManager.isDecorationsEnabled()
+            && LafManager.getTheme().useCustomDecorations()
             && JNIDecorations.isCustomDecorationSupported();
     }
 

core/src/main/java/com/github/weisj/darklaf/LafManager.java

@@ -44,6 +44,7 @@ public final class LafManager {
 
     private static Theme theme;
     private static boolean logEnabled = false;
+    private static boolean decorationsOverwrite = true;
 
     static {
         /*
@@ -76,6 +77,32 @@ public final class LafManager {
         LafManager.logEnabled = logEnabled;
     }
 
+    /**
+     * Returns whther custom decorations should be used.
+     * If this returns true decorations still might not be used if the theme or platform don't support them.
+     *
+     * @return true if decorations should be used.
+     */
+    public static boolean isDecorationsEnabled() {
+        return decorationsOverwrite;
+    }
+
+    /**
+     * Set globally whether decorations are enabled. By default this is true.
+     * Decorations are used if this value is set to true and the current platform and theme support
+     * custom decorations.
+     *
+     * @param enabled true if decorations should be used if available.
+     */
+    public static void setDecorationsEnabled(final boolean enabled) {
+        if (decorationsOverwrite != enabled) {
+            decorationsOverwrite = enabled;
+            if (!decorationsOverwrite) {
+                updateLaf();
+            }
+        }
+    }
+
     /**
      * Get the current theme. This method will never return null even if the LaF isn#t currently installed.
      *

core/src/main/java/com/github/weisj/darklaf/decorations/DefaultDecorationsProvider.java

@@ -0,0 +1,49 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 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.github.weisj.darklaf.decorations;
+
+import com.github.weisj.darklaf.ui.rootpane.CustomTitlePane;
+
+import javax.swing.*;
+
+public class DefaultDecorationsProvider implements JNIDecorationsProvider {
+    @Override
+    public CustomTitlePane createTitlePane(final JRootPane rootPane) {
+        return new CustomTitlePane() {
+            @Override
+            public void uninstall() {
+            }
+        };
+    }
+
+    @Override
+    public boolean isCustomDecorationSupported() {
+        return false;
+    }
+
+    @Override
+    public boolean updateLibrary() {
+        return false;
+    }
+}

core/src/main/java/com/github/weisj/darklaf/decorations/JNIDecorations.java

@@ -0,0 +1,57 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 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.github.weisj.darklaf.decorations;
+
+import com.github.weisj.darklaf.decorations.windows.WindowsDecorationsProvider;
+import com.github.weisj.darklaf.platform.SystemInfo;
+import com.github.weisj.darklaf.ui.rootpane.CustomTitlePane;
+
+import javax.swing.*;
+
+public final class JNIDecorations {
+
+    private static JNIDecorationsProvider decorationsProvider;
+
+    static {
+        //Extend for different platforms.
+        if (SystemInfo.isWindows) {
+            decorationsProvider = new WindowsDecorationsProvider();
+        } else {
+            decorationsProvider = new DefaultDecorationsProvider();
+        }
+    }
+
+    public static CustomTitlePane createTitlePane(final JRootPane rootPane) {
+        return decorationsProvider.createTitlePane(rootPane);
+    }
+
+
+    public static boolean isCustomDecorationSupported() {
+        return decorationsProvider.isCustomDecorationSupported();
+    }
+
+    public static boolean updateLibrary() {
+        return decorationsProvider.updateLibrary();
+    }
+}

core/src/main/java/com/github/weisj/darklaf/decorations/JNIDecorationsProvider.java

@@ -0,0 +1,53 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 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.github.weisj.darklaf.decorations;
+
+import com.github.weisj.darklaf.ui.rootpane.CustomTitlePane;
+
+import javax.swing.*;
+
+public interface JNIDecorationsProvider {
+
+    /**
+     * Create the custom title pane.
+     *
+     * @param rootPane The root pane to create the title pane for.
+     * @return the custom title pane.
+     */
+    CustomTitlePane createTitlePane(final JRootPane rootPane);
+
+    /**
+     * Returns whether custom decorations are supported.
+     *
+     * @return true if decorations are supported.
+     */
+    boolean isCustomDecorationSupported();
+
+    /**
+     * Load the decorations library if necessary.
+     *
+     * @return true if successful and library wasn't already loaded.
+     */
+    boolean updateLibrary();
+}

core/src/main/java/com/github/weisj/darklaf/decorations/windows/CloseButtonUI.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-package com.github.weisj.darklaf.ui.rootpane;
+package com.github.weisj.darklaf.decorations.windows;
 
 import com.github.weisj.darklaf.ui.button.DarkButtonUI;
 

core/src/main/java/com/github/weisj/darklaf/decorations/windows/DarkTitlePaneWindows.java

@@ -22,11 +22,12 @@
  * SOFTWARE.
  */
 
-package com.github.weisj.darklaf.ui.rootpane;
+package com.github.weisj.darklaf.decorations.windows;
 
 import com.github.weisj.darklaf.decorators.AncestorAdapter;
 import com.github.weisj.darklaf.icons.ScaledIcon;
-import com.github.weisj.darklaf.platform.windows.JNIDecorations;
+import com.github.weisj.darklaf.platform.windows.JNIDecorationsWindows;
+import com.github.weisj.darklaf.ui.rootpane.CustomTitlePane;
 import com.github.weisj.darklaf.util.Scale;
 import sun.awt.SunToolkit;
 
@@ -36,12 +37,7 @@ import javax.swing.event.AncestorEvent;
 import javax.swing.event.AncestorListener;
 import javax.swing.plaf.UIResource;
 import java.awt.*;
-import java.awt.event.ActionEvent;
-import java.awt.event.ContainerEvent;
-import java.awt.event.ContainerListener;
-import java.awt.event.WindowAdapter;
-import java.awt.event.WindowEvent;
-import java.awt.event.WindowListener;
+import java.awt.event.*;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.util.List;
@@ -50,7 +46,7 @@ import java.util.List;
  * @author Konstantin Bulenkov
  * @author Jannis Weis
  */
-public class DarkTitlePane extends JComponent {
+public class DarkTitlePaneWindows extends CustomTitlePane {
     private static final int PAD = 5;
     private static final int BAR_HEIGHT = 28;
     private static final int BUTTON_WIDTH = 46;
@@ -133,7 +129,7 @@ public class DarkTitlePane extends JComponent {
     private Color activeForeground;
     private Color border;
 
-    public DarkTitlePane(final JRootPane root) {
+    public DarkTitlePaneWindows(final JRootPane root) {
         this.rootPane = root;
         rootPane.addContainerListener(rootPaneContainerListener);
         rootPane.getLayeredPane().addContainerListener(layeredPaneContainerListener);
@@ -192,7 +188,7 @@ public class DarkTitlePane extends JComponent {
 
     protected void uninstallDecorations() {
         window = null;
-        JNIDecorations.uninstallDecorations(windowHandle);
+        JNIDecorationsWindows.uninstallDecorations(windowHandle);
         windowHandle = 0;
         rootPane.removeContainerListener(rootPaneContainerListener);
         rootPane.getLayeredPane().removeContainerListener(layeredPaneContainerListener);
@@ -205,12 +201,12 @@ public class DarkTitlePane extends JComponent {
     public void install() {
         if (window != null) {
             if (window instanceof Dialog || window instanceof Frame) {
-                windowHandle = JNIDecorations.getHWND(window);
+                windowHandle = JNIDecorationsWindows.getHWND(window);
 
-                JNIDecorations.installDecorations(windowHandle);
+                JNIDecorationsWindows.installDecorations(windowHandle);
                 updateResizeBehaviour();
                 Color color = window.getBackground();
-                JNIDecorations.setBackground(windowHandle, color.getRed(), color.getGreen(), color.getBlue());
+                JNIDecorationsWindows.setBackground(windowHandle, color.getRed(), color.getGreen(), color.getBlue());
             }
 
             if (window instanceof Frame) {
@@ -240,7 +236,7 @@ public class DarkTitlePane extends JComponent {
 
 
     private WindowListener createWindowListener() {
-        return new DarkTitlePane.WindowHandler();
+        return new DarkTitlePaneWindows.WindowHandler();
     }
 
 
@@ -363,15 +359,15 @@ public class DarkTitlePane extends JComponent {
     }
 
     private void minimize() {
-        JNIDecorations.minimize(windowHandle);
+        JNIDecorationsWindows.minimize(windowHandle);
     }
 
     private void maximize() {
-        JNIDecorations.maximize(windowHandle);
+        JNIDecorationsWindows.maximize(windowHandle);
     }
 
     private void restore() {
-        JNIDecorations.restore(windowHandle);
+        JNIDecorationsWindows.restore(windowHandle);
     }
 
     private void createActions() {
@@ -473,7 +469,7 @@ public class DarkTitlePane extends JComponent {
         boolean res = isResizable(window, rootPane);
         if (oldResizable != res) {
             oldResizable = res;
-            JNIDecorations.setResizable(windowHandle, res);
+            JNIDecorationsWindows.setResizable(windowHandle, res);
         }
     }
 
@@ -716,7 +712,7 @@ public class DarkTitlePane extends JComponent {
                 right = tmp;
 
             }
-            JNIDecorations.updateValues(windowHandle, Scale.scaleWidth(left),
+            JNIDecorationsWindows.updateValues(windowHandle, Scale.scaleWidth(left),
                                                Scale.scaleWidth(right),
                                                Scale.scaleHeight(height));
 
@@ -748,7 +744,7 @@ public class DarkTitlePane extends JComponent {
                     setState(frame.getExtendedState(), true);
                 }
                 if ("resizable".equals(name)) {
-                    JNIDecorations.setResizable(windowHandle, Boolean.TRUE.equals(pce.getNewValue()));
+                    JNIDecorationsWindows.setResizable(windowHandle, Boolean.TRUE.equals(pce.getNewValue()));
                     getRootPane().repaint();
                 }
             } else if ("title".equals(name)) {
@@ -763,7 +759,7 @@ public class DarkTitlePane extends JComponent {
                 repaint();
             } else if ("background".equals(name) && pce.getNewValue() instanceof Color) {
                 Color color = (Color) pce.getNewValue();
-                JNIDecorations.setBackground(windowHandle, color.getRed(), color.getGreen(), color.getBlue());
+                JNIDecorationsWindows.setBackground(windowHandle, color.getRed(), color.getGreen(), color.getBlue());
             }
         }
     }

core/src/main/java/com/github/weisj/darklaf/decorations/windows/TitlePaneIcon.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-package com.github.weisj.darklaf.ui.rootpane;
+package com.github.weisj.darklaf.decorations.windows;
 
 import javax.swing.*;
 import java.awt.*;

core/src/main/java/com/github/weisj/darklaf/decorations/windows/WindowsDecorationsProvider.java

@@ -0,0 +1,48 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 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.github.weisj.darklaf.decorations.windows;
+
+import com.github.weisj.darklaf.decorations.JNIDecorationsProvider;
+import com.github.weisj.darklaf.platform.windows.JNIDecorationsWindows;
+import com.github.weisj.darklaf.ui.rootpane.CustomTitlePane;
+
+import javax.swing.*;
+
+public class WindowsDecorationsProvider implements JNIDecorationsProvider {
+
+    @Override
+    public CustomTitlePane createTitlePane(final JRootPane rootPane) {
+        return new DarkTitlePaneWindows(rootPane);
+    }
+
+    @Override
+    public boolean isCustomDecorationSupported() {
+        return JNIDecorationsWindows.isCustomDecorationSupported();
+    }
+
+    @Override
+    public boolean updateLibrary() {
+        return JNIDecorationsWindows.updateLibrary();
+    }
+}

core/src/main/java/com/github/weisj/darklaf/ui/internalframe/DarkInternalFrameTitlePane.java

@@ -23,8 +23,8 @@
  */
 package com.github.weisj.darklaf.ui.internalframe;
 
+import com.github.weisj.darklaf.decorations.windows.TitlePaneIcon;
 import com.github.weisj.darklaf.icons.EmptyIcon;
-import com.github.weisj.darklaf.ui.rootpane.TitlePaneIcon;
 import sun.swing.SwingUtilities2;
 
 import javax.accessibility.AccessibleContext;

core/src/main/java/com/github/weisj/darklaf/ui/rootpane/CustomTitlePane.java

@@ -0,0 +1,32 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 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.github.weisj.darklaf.ui.rootpane;
+
+import javax.swing.*;
+
+public abstract class CustomTitlePane extends JComponent {
+
+
+    public abstract void uninstall();
+}

core/src/main/java/com/github/weisj/darklaf/ui/rootpane/DarkRootPaneUI.java

@@ -24,7 +24,7 @@
 
 package com.github.weisj.darklaf.ui.rootpane;
 
-import com.github.weisj.darklaf.platform.windows.JNIDecorations;
+import com.github.weisj.darklaf.decorations.JNIDecorations;
 
 import javax.swing.*;
 import javax.swing.plaf.ComponentUI;
@@ -42,7 +42,7 @@ import java.beans.PropertyChangeListener;
  */
 public class DarkRootPaneUI extends BasicRootPaneUI implements HierarchyListener {
     private Window window;
-    private DarkTitlePane titlePane;
+    private CustomTitlePane titlePane;
     private LayoutManager layoutManager;
     private LayoutManager oldLayout;
     private JRootPane rootPane;
@@ -139,7 +139,7 @@ public class DarkRootPaneUI extends BasicRootPaneUI implements HierarchyListener
     }
 
     private void installClientDecorations(final JRootPane root) {
-        DarkTitlePane titlePane = createTitlePane(root);
+        CustomTitlePane titlePane = JNIDecorations.createTitlePane(root);
         setTitlePane(root, titlePane);
         updateWindow(root.getParent());
         installLayout(root);
@@ -154,11 +154,7 @@ public class DarkRootPaneUI extends BasicRootPaneUI implements HierarchyListener
         }
     }
 
-    protected DarkTitlePane createTitlePane(final JRootPane root) {
-        return new DarkTitlePane(root);
-    }
-
-    private void setTitlePane(final JRootPane root, final DarkTitlePane titlePane) {
+    private void setTitlePane(final JRootPane root, final CustomTitlePane titlePane) {
         JLayeredPane layeredPane = root.getLayeredPane();
         JComponent oldTitlePane = getTitlePane();
 
@@ -222,8 +218,11 @@ public class DarkRootPaneUI extends BasicRootPaneUI implements HierarchyListener
 
         if (currWindow != null) {
             if (currWindow != window) {
-                if (!JNIDecorations.isCustomDecorationSupported()) return;
-                if (rootPane.getWindowDecorationStyle() == JRootPane.NONE) return;
+                if (!JNIDecorations.isCustomDecorationSupported()
+                    || rootPane.getWindowDecorationStyle() == JRootPane.NONE) {
+                    uninstallClientDecorations(rootPane);
+                    return;
+                }
                 updateClientDecoration();
             }
             window = currWindow;

windows/src/main/cpp/JNIDecorations.cpp

@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 #include "JNIDecorations.h"
-#include "com_github_weisj_darklaf_platform_windows_JNIDecorations.h"
+#include "com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows.h"
 #include <dwmapi.h>
 #include <iostream>
 #include <map>
@@ -130,7 +130,7 @@ LRESULT CALLBACK WindowWrapper::WindowProc(_In_ HWND hwnd, _In_ UINT uMsg, _In_
 }
 
 JNIEXPORT void JNICALL
-Java_com_github_weisj_darklaf_platform_windows_JNIDecorations_setResizable(JNIEnv *env, jclass obj, jlong hwnd, jboolean res)
+Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_setResizable(JNIEnv *env, jclass obj, jlong hwnd, jboolean res)
 {
     HWND handle = reinterpret_cast<HWND>(hwnd);
     auto wrap = wrapper_map[handle];
@@ -141,7 +141,7 @@ Java_com_github_weisj_darklaf_platform_windows_JNIDecorations_setResizable(JNIEn
 }
 
 JNIEXPORT void JNICALL
-Java_com_github_weisj_darklaf_platform_windows_JNIDecorations_updateValues(JNIEnv *env, jclass obj, jlong hwnd,
+Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_updateValues(JNIEnv *env, jclass obj, jlong hwnd,
                                                                            jint l, jint r, jint h)
 {
     HWND handle = reinterpret_cast<HWND>(hwnd);
@@ -155,7 +155,7 @@ Java_com_github_weisj_darklaf_platform_windows_JNIDecorations_updateValues(JNIEn
 }
 
 JNIEXPORT void JNICALL
-Java_com_github_weisj_darklaf_platform_windows_JNIDecorations_setBackground(JNIEnv *env, jclass obj, jlong hwnd, jint r, jint g, jint b)
+Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_setBackground(JNIEnv *env, jclass obj, jlong hwnd, jint r, jint g, jint b)
 {
     HWND handle = reinterpret_cast<HWND>(hwnd);
     auto wrap = wrapper_map[handle];
@@ -166,7 +166,7 @@ Java_com_github_weisj_darklaf_platform_windows_JNIDecorations_setBackground(JNIE
 }
 
 JNIEXPORT void JNICALL
-Java_com_github_weisj_darklaf_platform_windows_JNIDecorations_installDecorations(JNIEnv *env, jclass obj, jlong hwnd)
+Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_installDecorations(JNIEnv *env, jclass obj, jlong hwnd)
 {
     HWND handle = reinterpret_cast<HWND>(hwnd);
 
@@ -194,7 +194,7 @@ Java_com_github_weisj_darklaf_platform_windows_JNIDecorations_installDecorations
 }
 
 JNIEXPORT void JNICALL
-Java_com_github_weisj_darklaf_platform_windows_JNIDecorations_uninstallDecorations(JNIEnv *env, jclass obj, jlong hwnd)
+Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_uninstallDecorations(JNIEnv *env, jclass obj, jlong hwnd)
 {
     HWND handle = reinterpret_cast<HWND>(hwnd);
     auto wrap = wrapper_map[handle];
@@ -209,21 +209,21 @@ Java_com_github_weisj_darklaf_platform_windows_JNIDecorations_uninstallDecoratio
 //Window functions.
 
 JNIEXPORT void JNICALL
-Java_com_github_weisj_darklaf_platform_windows_JNIDecorations_minimize(JNIEnv *env, jclass obj, jlong hwnd)
+Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_minimize(JNIEnv *env, jclass obj, jlong hwnd)
 {
     HWND handle = reinterpret_cast<HWND>(hwnd);
     ShowWindow(handle, SW_MINIMIZE);
 }
 
 JNIEXPORT void JNICALL
-Java_com_github_weisj_darklaf_platform_windows_JNIDecorations_maximize(JNIEnv *env, jclass obj, jlong hwnd)
+Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_maximize(JNIEnv *env, jclass obj, jlong hwnd)
 {
     HWND handle = reinterpret_cast<HWND>(hwnd);
     ShowWindow(handle, SW_MAXIMIZE);
 }
 
 JNIEXPORT void JNICALL
-Java_com_github_weisj_darklaf_platform_windows_JNIDecorations_restore(JNIEnv *env, jclass obj, jlong hwnd)
+Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_restore(JNIEnv *env, jclass obj, jlong hwnd)
 {
     HWND handle = reinterpret_cast<HWND>(hwnd);
     ShowWindow(handle, SW_RESTORE);

windows/src/main/java/com/github/weisj/darklaf/platform/windows/JNIDecorationsWindows.java

@@ -36,16 +36,12 @@ import java.util.logging.Logger;
 /**
  * @author Jannis Weis
  */
-public class JNIDecorations {
+public class JNIDecorationsWindows {
 
-    private static final Logger LOGGER = Logger.getLogger(JNIDecorations.class.getName());
+    private static final Logger LOGGER = Logger.getLogger(JNIDecorationsWindows.class.getName());
     private static boolean supported;
     private static boolean loaded;
 
-    static {
-        updateLibrary();
-    }
-
     public static native void updateValues(final long hwnd, final int left, final int right, final int height);
 
     public static native void setResizable(final long hwnd, final boolean resizable);