Replaced hard coded property names with constants.

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

@@ -58,6 +58,7 @@ public class DarkLaf extends BasicLookAndFeel implements PropertyChangeListener
 
 
     public static final String SYSTEM_PROPERTY_PREFIX = "darklaf.";
+    public static final String LOOK_AND_FEEL_PROPERTY = "lookAndFeel";
     private static final Logger LOGGER = Logger.getLogger(DarkLaf.class.getName());
     private static final String NAME = "Darklaf";
     private final BasicLookAndFeel base;
@@ -425,7 +426,7 @@ public class DarkLaf extends BasicLookAndFeel implements PropertyChangeListener
 
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
-        if ("lookAndFeel".equals(evt.getPropertyName())) {
+        if (LOOK_AND_FEEL_PROPERTY.equals(evt.getPropertyName())) {
             if (UIManager.getLookAndFeel() == this) {
                 PropertyLoader.finish();
             }

core/src/main/java/com/github/weisj/darklaf/components/ScrollPopupMenu.java

@@ -24,6 +24,7 @@
 package com.github.weisj.darklaf.components;
 
 import com.github.weisj.darklaf.util.DarkUIUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import javax.swing.event.MenuKeyEvent;
@@ -85,7 +86,7 @@ public class ScrollPopupMenu extends JPopupMenu {
                 new OverlayScrollPane(view, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                                       JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
         JScrollBar bar = overlayScrollPane.getVerticalScrollBar();
-        bar.putClientProperty("ScrollBar.thin", Boolean.TRUE);
+        bar.putClientProperty("JScrollBar.thin", Boolean.TRUE);
         DarkUIUtil.doNotCancelPopupSetup(bar);
         DarkUIUtil.doNotCancelPopupSetup(overlayScrollPane.getScrollPane());
         return overlayScrollPane;
@@ -169,7 +170,7 @@ public class ScrollPopupMenu extends JPopupMenu {
             }
             firePopupMenuWillBecomeVisible();
             showPopup();
-            firePropertyChange("visible", Boolean.FALSE, Boolean.TRUE);
+            firePropertyChange(PropertyKey.VISIBLE, Boolean.FALSE, Boolean.TRUE);
         } else {
             hidePopup();
         }
@@ -180,7 +181,7 @@ public class ScrollPopupMenu extends JPopupMenu {
             firePopupMenuWillBecomeInvisible();
             popWin.setVisible(false);
             popWin = null;
-            firePropertyChange("visible", Boolean.TRUE, Boolean.FALSE);
+            firePropertyChange(PropertyKey.VISIBLE, Boolean.TRUE, Boolean.FALSE);
             if (isPopupMenu()) {
                 MenuSelectionManager.defaultManager().clearSelectedPath();
             }

core/src/main/java/com/github/weisj/darklaf/components/tabframe/JTabFrame.java

@@ -41,6 +41,8 @@ import java.util.Objects;
  */
 public class JTabFrame extends JComponent {
 
+    public static final String KEY_DND = "dndEnabled";
+
     private final JComponent bottomTabs = createTabContainer();
     private final JComponent topTabs = createTabContainer();
     private final JComponent leftTabs = createTabContainer();
@@ -537,7 +539,7 @@ public class JTabFrame extends JComponent {
             getPopupComponentAt(a).doLayout();
             getPopupComponentAt(a).requestFocus();
         }
-        firePropertyChange("visibleTab", new TabFramePosition(a, oldIndex), new TabFramePosition(a, index));
+        firePropertyChange(TabFramePopup.KEY_VISIBLE_TAB, new TabFramePosition(a, oldIndex), new TabFramePosition(a, index));
     }
 
     /**
@@ -931,7 +933,7 @@ public class JTabFrame extends JComponent {
         if (getDropTarget() != null) {
             getDropTarget().setActive(dndEnabled);
         }
-        firePropertyChange("dndEnabled", old, dndEnabled);
+        firePropertyChange(KEY_DND, old, dndEnabled);
     }
 
     /**

core/src/main/java/com/github/weisj/darklaf/components/tabframe/PanelPopup.java

@@ -35,7 +35,6 @@ import java.awt.*;
  * @since 2019
  */
 public class PanelPopup extends JPanel implements TabFramePopup {
-
     private Component content;
     private boolean open;
     private JTabFrame parent;
@@ -112,7 +111,7 @@ public class PanelPopup extends JPanel implements TabFramePopup {
         if (content == null) {
             content = new JPanel();
         }
-        firePropertyChange("content", old, content);
+        firePropertyChange(KEY_CONTENT, old, content);
     }
 
     @Override
@@ -127,7 +126,7 @@ public class PanelPopup extends JPanel implements TabFramePopup {
             boolean oldOpen = isOpen();
             parent.closeTab(getAlignment(), getIndex());
             open = false;
-            firePropertyChange("open", oldOpen, false);
+            firePropertyChange(KEY_OPEN, oldOpen, false);
         }
     }
 
@@ -145,7 +144,7 @@ public class PanelPopup extends JPanel implements TabFramePopup {
     public void setTabFrame(final JTabFrame parent) {
         JTabFrame old = this.parent;
         this.parent = parent;
-        firePropertyChange("tabFrame", old, parent);
+        firePropertyChange(KEY_TAB_FRAME_PARENT, old, parent);
     }
 
     @Override
@@ -161,7 +160,7 @@ public class PanelPopup extends JPanel implements TabFramePopup {
         }
         Alignment old = this.alignment;
         this.alignment = alignment;
-        firePropertyChange("alignment", old, alignment);
+        firePropertyChange(KEY_ALIGNMENT, old, alignment);
     }
 
     @Override
@@ -171,7 +170,7 @@ public class PanelPopup extends JPanel implements TabFramePopup {
             boolean oldOpen = isOpen();
             parent.openTab(getAlignment(), getIndex());
             open = true;
-            firePropertyChange("open", oldOpen, true);
+            firePropertyChange(KEY_OPEN, oldOpen, true);
             requestFocus();
         }
     }
@@ -185,7 +184,7 @@ public class PanelPopup extends JPanel implements TabFramePopup {
     public void setTitle(final String title) {
         String old = this.title;
         this.title = title == null ? "" : title;
-        firePropertyChange("title", old, this.title);
+        firePropertyChange(KEY_TITLE, old, this.title);
     }
 
     @Override
@@ -197,7 +196,7 @@ public class PanelPopup extends JPanel implements TabFramePopup {
     public void setIcon(final Icon icon) {
         Icon old = this.icon;
         this.icon = icon;
-        firePropertyChange("icon", old, icon);
+        firePropertyChange(KEY_ICON, old, icon);
     }
 
     @Override
@@ -209,6 +208,6 @@ public class PanelPopup extends JPanel implements TabFramePopup {
     public void setIndex(final int index) {
         int old = this.index;
         this.index = index;
-        firePropertyChange("index", old, index);
+        firePropertyChange(KEY_INDEX, old, index);
     }
 }

core/src/main/java/com/github/weisj/darklaf/components/tabframe/TabFramePopup.java

@@ -29,6 +29,15 @@ import javax.swing.*;
 import java.awt.*;
 
 public interface TabFramePopup {
+    String KEY_VISIBLE_TAB = "visibleTab";
+    String KEY_CONTENT = "content";
+    String KEY_TAB_FRAME_PARENT = "tabFrame";
+    String KEY_ALIGNMENT = "alignment";
+    String KEY_ICON = "icon";
+    String KEY_INDEX = "index";
+    String KEY_TITLE = "title";
+    String KEY_OPEN = "open";
+    String KEY_PEER_INSETS = "peerInsets";
 
     /**
      * Get the current content pane. A popup may hold more than one content pane. In this case this method should return

core/src/main/java/com/github/weisj/darklaf/components/tabframe/TabFrameTab.java

@@ -28,6 +28,12 @@ import com.github.weisj.darklaf.util.Alignment;
 import java.awt.*;
 
 public interface TabFrameTab {
+    String KEY_SELECTED = "selected";
+    String KEY_CONTENT = "content";
+    String KEY_TAB_FRAME_PARENT = "tabFrame";
+    String KEY_ORIENTATION = "orientation";
+    String KEY_ACCELERATOR = "accelerator";
+    String KEY_TITLE = "title";
 
     /**
      * Get the index of the tab.

core/src/main/java/com/github/weisj/darklaf/components/tabframe/TabFrameTabContainer.java

@@ -74,7 +74,7 @@ public class TabFrameTabContainer extends JPanel implements TabFrameTab {
         remove(content);
         this.content = content;
         add(content, BorderLayout.CENTER);
-        firePropertyChange("content", old, content);
+        firePropertyChange(KEY_CONTENT, old, content);
     }
 
     @Override
@@ -110,7 +110,7 @@ public class TabFrameTabContainer extends JPanel implements TabFrameTab {
         if (this.orientation == a) return;
         Alignment oldOrientation = this.orientation;
         this.orientation = a;
-        firePropertyChange("orientation", oldOrientation, orientation);
+        firePropertyChange(KEY_ORIENTATION, oldOrientation, orientation);
     }
 
     @Override
@@ -123,7 +123,7 @@ public class TabFrameTabContainer extends JPanel implements TabFrameTab {
         if (selected == this.selected) return;
         boolean oldSelected = this.selected;
         this.selected = selected;
-        firePropertyChange("selected", oldSelected, selected);
+        firePropertyChange(KEY_SELECTED, oldSelected, selected);
     }
 
     @Override
@@ -136,7 +136,7 @@ public class TabFrameTabContainer extends JPanel implements TabFrameTab {
         if (this.accelerator == accelerator) return;
         int oldAccelerator = this.accelerator;
         this.accelerator = accelerator;
-        firePropertyChange("accelerator", oldAccelerator, accelerator);
+        firePropertyChange(KEY_ACCELERATOR, oldAccelerator, accelerator);
     }
 
     @Override
@@ -148,6 +148,6 @@ public class TabFrameTabContainer extends JPanel implements TabFrameTab {
     public void setTabFrame(final JTabFrame parent) {
         JTabFrame old = this.parent;
         this.parent = parent;
-        firePropertyChange("tabFrame", old, parent);
+        firePropertyChange(KEY_TAB_FRAME_PARENT, old, parent);
     }
 }

core/src/main/java/com/github/weisj/darklaf/components/tabframe/TabFrameTabLabel.java

@@ -99,7 +99,7 @@ public class TabFrameTabLabel extends JLabel implements TabFrameTab {
         if (this.orientation == a) return;
         Alignment oldOrientation = this.orientation;
         this.orientation = a;
-        firePropertyChange("orientation", oldOrientation, orientation);
+        firePropertyChange(KEY_ORIENTATION, oldOrientation, orientation);
     }
 
     @Override
@@ -112,7 +112,7 @@ public class TabFrameTabLabel extends JLabel implements TabFrameTab {
         if (selected == this.selected) return;
         boolean oldSelected = this.selected;
         this.selected = selected;
-        firePropertyChange("selected", oldSelected, selected);
+        firePropertyChange(KEY_SELECTED, oldSelected, selected);
     }
 
     @Override
@@ -125,7 +125,7 @@ public class TabFrameTabLabel extends JLabel implements TabFrameTab {
         if (this.accelerator == accelerator) return;
         int oldAccelerator = this.accelerator;
         this.accelerator = accelerator;
-        firePropertyChange("accelerator", oldAccelerator, accelerator);
+        firePropertyChange(KEY_ACCELERATOR, oldAccelerator, accelerator);
     }
 
     @Override
@@ -137,7 +137,7 @@ public class TabFrameTabLabel extends JLabel implements TabFrameTab {
     public void setTabFrame(final JTabFrame parent) {
         JTabFrame old = this.parent;
         this.parent = parent;
-        firePropertyChange("tabFrame", old, parent);
+        firePropertyChange(KEY_TAB_FRAME_PARENT, old, parent);
     }
 
     /**
@@ -159,6 +159,6 @@ public class TabFrameTabLabel extends JLabel implements TabFrameTab {
         if (Objects.equals(title, this.title)) return;
         String oldTitle = this.title;
         this.title = title;
-        firePropertyChange("title", oldTitle, selected);
+        firePropertyChange(KEY_TITLE, oldTitle, selected);
     }
 }

core/src/main/java/com/github/weisj/darklaf/components/text/NumberingPane.java

@@ -26,20 +26,15 @@ package com.github.weisj.darklaf.components.text;
 import com.github.weisj.darklaf.util.StringUtil;
 
 import javax.swing.*;
-import javax.swing.text.BadLocationException;
-import javax.swing.text.Document;
-import javax.swing.text.JTextComponent;
-import javax.swing.text.Position;
-import javax.swing.text.Segment;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
+import javax.swing.text.*;
+import java.util.*;
 import java.util.stream.Collectors;
 
 public class NumberingPane extends JComponent {
 
+    public static final String KEY_EDITOR = "editorPane";
+    public static final String KEY_ICONS = "icons";
+    public static final String KEY_MIN_ICON_WIDTH = "minimumIconWidth";
     private JTextComponent textComponent;
     private Map<Position, Icon> iconMap;
     private Map<Position, List<IconListener>> listenerMap;
@@ -68,7 +63,7 @@ public class NumberingPane extends JComponent {
     public void setTextComponent(final JTextComponent textComponent) {
         JTextComponent old = this.textComponent;
         this.textComponent = textComponent;
-        firePropertyChange("editorPane", old, textComponent);
+        firePropertyChange(KEY_EDITOR, old, textComponent);
     }
 
     public int getIconCount() {
@@ -114,7 +109,7 @@ public class NumberingPane extends JComponent {
         if (icon != null) {
             iconMap.put(pos, icon);
         }
-        firePropertyChange("icons", null, icon);
+        firePropertyChange(KEY_ICONS, null, icon);
         return pos;
     }
 
@@ -174,7 +169,7 @@ public class NumberingPane extends JComponent {
     public void setMinimumIconWidth(final int width) {
         int old = this.width;
         this.width = Math.max(width, 0);
-        firePropertyChange("minimumIconWidth", old, width);
+        firePropertyChange(KEY_MIN_ICON_WIDTH, old, width);
     }
 
     public Collection<Icon> getIcons() {
@@ -187,7 +182,7 @@ public class NumberingPane extends JComponent {
 
     public void removeIconAt(final Position position) {
         Icon icon = iconMap.remove(position);
-        firePropertyChange("icons", icon, icon);
+        firePropertyChange(KEY_ICONS, icon, icon);
     }
 
     public List<IconListener> getIconListeners() {

core/src/main/java/com/github/weisj/darklaf/components/tooltip/DarkToolTip.java

@@ -39,6 +39,7 @@ import java.util.Objects;
 
 public class DarkToolTip extends JToolTip implements PropertyChangeListener {
 
+    public static final String TIP_TEXT_PROPERTY = "tiptext";
     private static final long REPAINT_THRESHOLD = 150;
     private static final AlphaComposite COMPOSITE = AlphaComposite.getInstance(AlphaComposite.SRC_OVER);
     private static final float MAX_ALPHA = 1.0f;
@@ -141,7 +142,7 @@ public class DarkToolTip extends JToolTip implements PropertyChangeListener {
 
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
-        if ("tiptext".equals(evt.getPropertyName())) {
+        if (TIP_TEXT_PROPERTY.equals(evt.getPropertyName())) {
             setPreferredSize(getUI().getPreferredSize(this));
             if (!Objects.equals(evt.getNewValue(), evt.getOldValue())) {
                 notifyToolTipListeners(ToolTipEvent.TEXT);

core/src/main/java/com/github/weisj/darklaf/platform/Decorations.java

@@ -29,6 +29,7 @@ import com.github.weisj.darklaf.decorations.CustomTitlePane;
 import com.github.weisj.darklaf.decorations.DecorationsProvider;
 import com.github.weisj.darklaf.platform.macos.MacOSDecorationsProvider;
 import com.github.weisj.darklaf.platform.windows.WindowsDecorationsProvider;
+import com.github.weisj.darklaf.util.PropertyValue;
 import com.github.weisj.darklaf.util.SystemInfo;
 
 import javax.swing.*;
@@ -61,7 +62,7 @@ public final class Decorations {
 
     public static boolean isCustomDecorationSupported() {
         return decorationsProvider.isCustomDecorationSupported()
-            && !"false".equals(System.getProperty(DarkLaf.SYSTEM_PROPERTY_PREFIX + "decorations"))
+            && !PropertyValue.FALSE.equals(System.getProperty(DarkLaf.SYSTEM_PROPERTY_PREFIX + "decorations"))
             && LafManager.isDecorationsEnabled()
             && LafManager.getTheme().useCustomDecorations();
     }

core/src/main/java/com/github/weisj/darklaf/ui/button/AbstractButtonLayoutDelegate.java

@@ -23,6 +23,8 @@
  */
 package com.github.weisj.darklaf.ui.button;
 
+import com.github.weisj.darklaf.util.PropertyKey;
+
 import javax.swing.*;
 import java.awt.*;
 
@@ -32,7 +34,7 @@ public class AbstractButtonLayoutDelegate extends AbstractButton {
 
     public void setDelegate(final AbstractButton delegate) {
         this.delegate = delegate;
-        if (delegate != null) putClientProperty("html", delegate.getClientProperty("html"));
+        if (delegate != null) putClientProperty(PropertyKey.HTML, delegate.getClientProperty(PropertyKey.HTML));
     }
 
     @Override

core/src/main/java/com/github/weisj/darklaf/ui/button/DarkButtonUI.java

@@ -23,10 +23,7 @@
  */
 package com.github.weisj.darklaf.ui.button;
 
-import com.github.weisj.darklaf.util.DarkUIUtil;
-import com.github.weisj.darklaf.util.GraphicsContext;
-import com.github.weisj.darklaf.util.GraphicsUtil;
-import com.github.weisj.darklaf.util.SystemInfo;
+import com.github.weisj.darklaf.util.*;
 import sun.swing.SwingUtilities2;
 
 import javax.swing.*;
@@ -48,6 +45,18 @@ import java.beans.PropertyChangeListener;
  */
 public class DarkButtonUI extends BasicButtonUI implements PropertyChangeListener {
 
+    public static final String KEY_PREFIX = "JButton.";
+    public static final String KEY_VARIANT = KEY_PREFIX + "variant";
+    public static final String KEY_HOVER_COLOR = KEY_PREFIX + "shadow.hover";
+    public static final String KEY_CLICK_COLOR = KEY_PREFIX + "shadow.click";
+    public static final String KEY_ALT_ARC = KEY_PREFIX + "alternativeArc";
+    public static final String KEY_NO_ARC = KEY_PREFIX + "noArc";
+    public static final String KEY_SQUARE = KEY_PREFIX + "square";
+    public static final String KEY_THIN = KEY_PREFIX + "thin";
+    public static final String KEY_NO_SHADOW_OVERWRITE = KEY_PREFIX + "noShadowOverwrite";
+    public static final String VARIANT_ONLY_LABEL = "onlyLabel";
+    public static final String VARIANT_FULL_SHADOW = "fullShadow";
+    public static final String VARIANT_SHADOW = "shadow";
     protected static final Rectangle viewRect = new Rectangle();
     protected static final Rectangle textRect = new Rectangle();
     protected static final Rectangle iconRect = new Rectangle();
@@ -85,29 +94,12 @@ public class DarkButtonUI extends BasicButtonUI implements PropertyChangeListene
 
     public static boolean chooseAlternativeArc(final Component c) {
         return c instanceof JButton
-            && Boolean.TRUE.equals(((JButton) c).getClientProperty("JButton.alternativeArc"));
+            && Boolean.TRUE.equals(((JButton) c).getClientProperty(KEY_ALT_ARC));
     }
 
-    @Override
-    protected void installDefaults(final AbstractButton b) {
-        super.installDefaults(b);
-        LookAndFeel.installProperty(b, "opaque", false);
-        b.setRolloverEnabled(UIManager.getBoolean("Button.rolloverEnabled"));
-        borderSize = UIManager.getInt("Button.borderThickness");
-        shadowHeight = UIManager.getInt("Button.shadowHeight");
-        inactiveForeground = UIManager.getColor("Button.disabledText");
-        defaultForeground = UIManager.getColor("Button.selectedButtonForeground");
-        defaultBackground = UIManager.getColor("Button.defaultFillColor");
-        defaultHoverBackground = UIManager.getColor("Button.defaultFillColorRollOver");
-        defaultClickBackground = UIManager.getColor("Button.defaultFillColorClick");
-        background = UIManager.getColor("Button.activeFillColor");
-        hoverBackground = UIManager.getColor("Button.activeFillColorRollOver");
-        clickBackground = UIManager.getColor("Button.activeFillColorClick");
-        inactiveBackground = UIManager.getColor("Button.inactiveFillColor");
-        shadowHover = UIManager.getColor("Button.shadow.hover");
-        shadowClick = UIManager.getColor("Button.shadow.click");
-        arc = UIManager.getInt("Button.arc");
-        squareArc = UIManager.getInt("Button.squareArc");
+    public static boolean isLabelButton(final Component c) {
+        return c instanceof JButton
+            && VARIANT_ONLY_LABEL.equals(((JButton) c).getClientProperty(KEY_VARIANT));
     }
 
     @Override
@@ -122,9 +114,14 @@ public class DarkButtonUI extends BasicButtonUI implements PropertyChangeListene
         b.removePropertyChangeListener(this);
     }
 
-    public static boolean isLabelButton(final Component c) {
-        return c instanceof JButton
-            && "onlyLabel".equals(((JButton) c).getClientProperty("JButton.variant"));
+    public static boolean isShadowVariant(final Component c) {
+        if (isFullShadow(c)) return true;
+        if (c instanceof JButton) {
+            JButton b = (JButton) c;
+            return (isIconOnly(b) && convertIconButtonToShadow(b))
+                || VARIANT_SHADOW.equals(b.getClientProperty(KEY_VARIANT));
+        }
+        return false;
     }
 
     @Override
@@ -146,14 +143,9 @@ public class DarkButtonUI extends BasicButtonUI implements PropertyChangeListene
         config.restore();
     }
 
-    public static boolean isShadowVariant(final Component c) {
-        if (isFullShadow(c)) return true;
-        if (c instanceof JButton) {
-            JButton b = (JButton) c;
-            return (isIconOnly(b) && convertIconButtonToShadow(b))
-                || "shadow".equals(b.getClientProperty("JButton.variant"));
-        }
-        return false;
+    public static boolean isFullShadow(final Component c) {
+        return c instanceof JButton
+            && VARIANT_FULL_SHADOW.equals(((JButton) c).getClientProperty(KEY_VARIANT));
     }
 
     protected static boolean isIconOnly(final AbstractButton b) {
@@ -172,9 +164,9 @@ public class DarkButtonUI extends BasicButtonUI implements PropertyChangeListene
         return fg;
     }
 
-    public static boolean isFullShadow(final Component c) {
+    public static boolean isNoArc(final Component c) {
         return c instanceof JButton
-            && "fullShadow".equals(((JButton) c).getClientProperty("JButton.variant"));
+            && Boolean.TRUE.equals(((JButton) c).getClientProperty(KEY_NO_ARC));
     }
 
     private boolean shouldDrawBackground(final JComponent c) {
@@ -184,11 +176,8 @@ public class DarkButtonUI extends BasicButtonUI implements PropertyChangeListene
         return c.isEnabled() && border != null && button.isContentAreaFilled();
     }
 
-    protected Color getShadowColor(final AbstractButton c) {
-        Object colorHover = c.getClientProperty("JButton.shadow.hover");
-        Object colorClick = c.getClientProperty("JButton.shadow.click");
-        return c.getModel().isArmed() ? colorClick instanceof Color ? (Color) colorClick : shadowClick
-                                      : colorHover instanceof Color ? (Color) colorHover : shadowHover;
+    public static boolean isSquare(final Component c) {
+        return c instanceof JButton && Boolean.TRUE.equals(((JButton) c).getClientProperty(KEY_SQUARE));
     }
 
     protected Color getBackgroundColor(final JComponent c) {
@@ -267,24 +256,44 @@ public class DarkButtonUI extends BasicButtonUI implements PropertyChangeListene
         }
     }
 
-    public static boolean isNoArc(final Component c) {
-        return c instanceof JButton
-            && Boolean.TRUE.equals(((JButton) c).getClientProperty("JButton.noArc"));
-    }
-
-    public static boolean isSquare(final Component c) {
-        return c instanceof JButton && Boolean.TRUE.equals(((JButton) c).getClientProperty("JButton.square"));
-    }
-
     public static boolean isThin(final Component c) {
         return c instanceof JButton
-            && Boolean.TRUE.equals(((JButton) c).getClientProperty("JButton.thin"));
+            && Boolean.TRUE.equals(((JButton) c).getClientProperty(KEY_THIN));
     }
 
     protected static boolean convertIconButtonToShadow(final AbstractButton b) {
         return !(b instanceof UIResource)
             && UIManager.getBoolean("Button.convertIconOnlyToShadow")
-            && !Boolean.TRUE.equals(b.getClientProperty("JButton.noShadowOverwrite"));
+            && !Boolean.TRUE.equals(b.getClientProperty(KEY_NO_SHADOW_OVERWRITE));
+    }
+
+    @Override
+    protected void installDefaults(final AbstractButton b) {
+        super.installDefaults(b);
+        LookAndFeel.installProperty(b, PropertyKey.OPAQUE, false);
+        b.setRolloverEnabled(UIManager.getBoolean("Button.rolloverEnabled"));
+        borderSize = UIManager.getInt("Button.borderThickness");
+        shadowHeight = UIManager.getInt("Button.shadowHeight");
+        inactiveForeground = UIManager.getColor("Button.disabledText");
+        defaultForeground = UIManager.getColor("Button.selectedButtonForeground");
+        defaultBackground = UIManager.getColor("Button.defaultFillColor");
+        defaultHoverBackground = UIManager.getColor("Button.defaultFillColorRollOver");
+        defaultClickBackground = UIManager.getColor("Button.defaultFillColorClick");
+        background = UIManager.getColor("Button.activeFillColor");
+        hoverBackground = UIManager.getColor("Button.activeFillColorRollOver");
+        clickBackground = UIManager.getColor("Button.activeFillColorClick");
+        inactiveBackground = UIManager.getColor("Button.inactiveFillColor");
+        shadowHover = UIManager.getColor("Button.shadow.hover");
+        shadowClick = UIManager.getColor("Button.shadow.click");
+        arc = UIManager.getInt("Button.arc");
+        squareArc = UIManager.getInt("Button.squareArc");
+    }
+
+    protected Color getShadowColor(final AbstractButton c) {
+        Object colorHover = c.getClientProperty(KEY_HOVER_COLOR);
+        Object colorClick = c.getClientProperty(KEY_CLICK_COLOR);
+        return c.getModel().isArmed() ? colorClick instanceof Color ? (Color) colorClick : shadowClick
+                                      : colorHover instanceof Color ? (Color) colorHover : shadowHover;
     }
 
     @Override
@@ -302,14 +311,14 @@ public class DarkButtonUI extends BasicButtonUI implements PropertyChangeListene
             oldSquare = isSquare(button);
             oldAltArc = chooseAlternativeArc(button);
             button.setRolloverEnabled(true);
-            button.putClientProperty("JButton.square", true);
-            button.putClientProperty("JButton.thin", true);
-            button.putClientProperty("JButton.alternativeArc", true);
+            button.putClientProperty(KEY_SQUARE, true);
+            button.putClientProperty(KEY_THIN, true);
+            button.putClientProperty(KEY_ALT_ARC, true);
         } else {
             button.setRolloverEnabled(oldRolloverEnabled);
-            button.putClientProperty("JButton.square", oldSquare);
-            button.putClientProperty("JButton.thin", oldThin);
-            button.putClientProperty("JButton.alternativeArc", oldAltArc);
+            button.putClientProperty(KEY_SQUARE, oldSquare);
+            button.putClientProperty(KEY_THIN, oldThin);
+            button.putClientProperty(KEY_ALT_ARC, oldAltArc);
         }
     }
 
@@ -401,7 +410,7 @@ public class DarkButtonUI extends BasicButtonUI implements PropertyChangeListene
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
         String key = evt.getPropertyName();
-        if (key.startsWith("JButton.")) {
+        if (key.startsWith(KEY_PREFIX)) {
             button.repaint();
             button.revalidate();
         } else if (JButton.TEXT_CHANGED_PROPERTY.equals(key)) {

core/src/main/java/com/github/weisj/darklaf/ui/button/DarkToggleButtonUI.java

@@ -26,6 +26,7 @@ package com.github.weisj.darklaf.ui.button;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.GraphicsContext;
 import com.github.weisj.darklaf.util.GraphicsUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 import sun.swing.SwingUtilities2;
 
 import javax.swing.*;
@@ -39,22 +40,30 @@ import java.beans.PropertyChangeListener;
  */
 public class DarkToggleButtonUI extends DarkButtonUI {
 
+    public static final String KEY_PREFIX = "JToggleButton.";
+    public static final String KEY_VARIANT = KEY_PREFIX + "variant";
+    public static final String KEY_IS_TREE_EDITOR = KEY_PREFIX + "isTreeCellEditor";
+    public static final String KEY_IS_TREE_RENDER = KEY_PREFIX + "isTreeCellRenderer";
+    public static final String KEY_IS_TABLE_EDITOR = KEY_PREFIX + "isTableCellEditor";
+    public static final String KEY_IS_TABLE_RENDERER = KEY_PREFIX + "isTableCellRenderer";
+    public static final String KEY_CLEAR_HIT_AREA = KEY_PREFIX + "clearHitArea";
+    public static final String VARIANT_SLIDER = "slider";
     private static final Rectangle rect = new Rectangle();
 
     private final PropertyChangeListener propertyChangeListener = evt -> {
         String key = evt.getPropertyName();
-        if ("JToggleButton.variant".equals(key)) {
+        if (KEY_VARIANT.equals(key)) {
             Object oldVal = evt.getOldValue();
             Object newVal = evt.getNewValue();
             if (oldVal != null && oldVal.equals(newVal)) {
                 return;
             }
-            if ("slider".equals(newVal)) {
+            if (VARIANT_SLIDER.equals(newVal)) {
                 button.setBorderPainted(false);
             } else {
                 button.setBorderPainted(true);
             }
-        } else if ("componentOrientation".equals(key)) {
+        } else if (PropertyKey.COMPONENT_ORIENTATION.equals(key)) {
             button.repaint();
         }
     };
@@ -159,7 +168,7 @@ public class DarkToggleButtonUI extends DarkButtonUI {
 
     private static boolean isSlider(final JComponent c) {
         return c instanceof JToggleButton
-                && "slider".equals(c.getClientProperty("JToggleButton.variant"));
+            && VARIANT_SLIDER.equals(c.getClientProperty(KEY_VARIANT));
     }
 
     private void paintSlider(final Graphics2D g, final AbstractButton c) {

core/src/main/java/com/github/weisj/darklaf/ui/cell/DarkCellRendererToggleButton.java

@@ -25,6 +25,8 @@ package com.github.weisj.darklaf.ui.cell;
 
 import com.github.weisj.darklaf.components.SelectableTreeNode;
 import com.github.weisj.darklaf.decorators.CellRenderer;
+import com.github.weisj.darklaf.ui.button.DarkToggleButtonUI;
+import com.github.weisj.darklaf.ui.table.DarkTableUI;
 import com.github.weisj.darklaf.ui.tree.DarkTreeCellRenderer;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 
@@ -58,7 +60,7 @@ public class DarkCellRendererToggleButton<T extends JToggleButton & CellEditorTo
         toggleButton.setHorizontalAlignment(table.getComponentOrientation().isLeftToRight() ? LEFT : RIGHT);
         toggleButton.setHasFocus(focus);
 
-        boolean alternativeRow = Boolean.TRUE.equals(table.getClientProperty("JTable.alternateRowColor"));
+        boolean alternativeRow = Boolean.TRUE.equals(table.getClientProperty(DarkTableUI.KEY_ALTERNATE_ROW_COLOR));
         Color alternativeRowColor = UIManager.getColor("Table.alternateRowBackground");
         Color normalColor = UIManager.getColor("Table.background");
         Color background = alternativeRow && row % 2 == 1 ? alternativeRowColor : normalColor;
@@ -114,8 +116,8 @@ public class DarkCellRendererToggleButton<T extends JToggleButton & CellEditorTo
 
         public CellEditorCheckBox(final boolean opaque) {
             setOpaque(opaque);
-            putClientProperty("JToggleButton.isTreeCellEditor", true);
-            putClientProperty("JToggleButton.isTableCellEditor", true);
+            putClientProperty(DarkToggleButtonUI.KEY_IS_TREE_EDITOR, true);
+            putClientProperty(DarkToggleButtonUI.KEY_IS_TABLE_EDITOR, true);
         }
 
         public void setHasFocus(final boolean hasFocus) {
@@ -139,8 +141,8 @@ public class DarkCellRendererToggleButton<T extends JToggleButton & CellEditorTo
 
         public CellEditorRadioButton(final boolean opaque) {
             setOpaque(opaque);
-            putClientProperty("JToggleButton.isTreeCellEditor", true);
-            putClientProperty("JToggleButton.isTableCellEditor", true);
+            putClientProperty(DarkToggleButtonUI.KEY_IS_TREE_EDITOR, true);
+            putClientProperty(DarkToggleButtonUI.KEY_IS_TABLE_EDITOR, true);
         }
 
         public void setHasFocus(final boolean hasFocus) {

core/src/main/java/com/github/weisj/darklaf/ui/checkbox/DarkCheckBoxBorder.java

@@ -24,6 +24,7 @@
 package com.github.weisj.darklaf.ui.checkbox;
 
 
+import com.github.weisj.darklaf.ui.button.DarkToggleButtonUI;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 
 import javax.swing.*;
@@ -63,12 +64,12 @@ public class DarkCheckBoxBorder implements Border, UIResource {
 
     protected static boolean isTreeCellEditor(final Component c) {
         return c instanceof JComponent
-                && Boolean.TRUE.equals(((JComponent) c).getClientProperty("JToggleButton.isTreeCellEditor"));
+            && Boolean.TRUE.equals(((JComponent) c).getClientProperty(DarkToggleButtonUI.KEY_IS_TREE_EDITOR));
     }
 
     protected static boolean isTableCellEditor(final Component c) {
         return c instanceof JComponent
-                && Boolean.TRUE.equals(((JComponent) c).getClientProperty("JToggleButton.isTreeCellEditor"));
+            && Boolean.TRUE.equals(((JComponent) c).getClientProperty(DarkToggleButtonUI.KEY_IS_TREE_EDITOR));
     }
 
     @Override

core/src/main/java/com/github/weisj/darklaf/ui/checkbox/DarkCheckBoxUI.java

@@ -24,9 +24,11 @@
 package com.github.weisj.darklaf.ui.checkbox;
 
 import com.github.weisj.darklaf.icons.EmptyIcon;
+import com.github.weisj.darklaf.ui.button.DarkToggleButtonUI;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.GraphicsContext;
 import com.github.weisj.darklaf.util.GraphicsUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 import sun.swing.SwingUtilities2;
 
 import javax.swing.*;
@@ -95,7 +97,7 @@ public class DarkCheckBoxUI extends MetalCheckBoxUI implements PropertyChangeLis
     @Override
     public void installDefaults(final AbstractButton b) {
         super.installDefaults(b);
-        LookAndFeel.installProperty(b, "opaque", false);
+        LookAndFeel.installProperty(b, PropertyKey.OPAQUE, false);
         checkBoxIcon = UIManager.getIcon("CheckBox.unchecked.icon");
         checkBoxDisabledIcon = UIManager.getIcon("CheckBox.uncheckedDisabled.icon");
         checkBoxFocusedIcon = UIManager.getIcon("CheckBox.uncheckedFocused.icon");
@@ -333,13 +335,14 @@ public class DarkCheckBoxUI extends MetalCheckBoxUI implements PropertyChangeLis
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
         String key = evt.getPropertyName();
-        if ("componentOrientation".equals(key)) {
+        if (PropertyKey.COMPONENT_ORIENTATION.equals(key)) {
             checkBox.repaint();
             hitArea.setRoundRect(0, 0, 0, 0, 0, 0);
-        } else if ("JToggleButton.isTreeCellEditor".equals(key) || "JToggleButton.isTableCellEditor".equals(key)) {
+        } else if (DarkToggleButtonUI.KEY_IS_TREE_EDITOR.equals(key)
+            || DarkToggleButtonUI.KEY_IS_TABLE_EDITOR.equals(key)) {
             checkBox.repaint();
             hitArea.setRoundRect(0, 0, 0, 0, 0, 0);
-        } else if ("JToggleButton.clearHitArea".equals(key)) {
+        } else if (DarkToggleButtonUI.KEY_CLEAR_HIT_AREA.equals(key)) {
             hitArea.setRoundRect(0, 0, 0, 0, 0, 0);
         }
     }

core/src/main/java/com/github/weisj/darklaf/ui/colorchooser/DarkColorChooserPanel.java

@@ -29,6 +29,7 @@ import com.github.weisj.darklaf.components.DefaultColorPipette;
 import com.github.weisj.darklaf.components.uiresource.JButtonUIResource;
 import com.github.weisj.darklaf.decorators.AncestorAdapter;
 import com.github.weisj.darklaf.util.ColorUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import javax.swing.colorchooser.AbstractColorChooserPanel;
@@ -246,7 +247,7 @@ public class DarkColorChooserPanel extends AbstractColorChooserPanel implements
         field.setColumns(hex ? 8 : 4);
         if (!hex) {
             field.addPropertyChangeListener(e -> {
-                if ("value".equals(e.getPropertyName())) {
+                if (PropertyKey.VALUE.equals(e.getPropertyName())) {
                     updatePreviewFromTextFields();
                 }
             });

core/src/main/java/com/github/weisj/darklaf/ui/colorchooser/DarkColorChooserUI.java

@@ -27,6 +27,7 @@ import com.github.weisj.darklaf.color.DarkColorModel;
 import com.github.weisj.darklaf.color.DarkColorModelCMYK;
 import com.github.weisj.darklaf.color.DarkColorModelHSL;
 import com.github.weisj.darklaf.decorators.AncestorAdapter;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import javax.swing.colorchooser.AbstractColorChooserPanel;
@@ -43,7 +44,7 @@ import java.beans.PropertyChangeListener;
 public class DarkColorChooserUI extends BasicColorChooserUI {
 
     private final PropertyChangeListener propertyChangeListener = e -> {
-        if ("ancestor".equals(e.getPropertyName())) {
+        if (PropertyKey.ANCESTOR.equals(e.getPropertyName())) {
             JComponent pane = (JComponent) e.getNewValue();
             if (pane != null) {
                 pane = (JComponent) pane.getRootPane().getContentPane();

core/src/main/java/com/github/weisj/darklaf/ui/combobox/DarkComboBoxUI.java

@@ -27,6 +27,7 @@ import com.github.weisj.darklaf.components.ArrowButton;
 import com.github.weisj.darklaf.ui.list.DarkListCellRenderer;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.GraphicsContext;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import javax.swing.border.Border;
@@ -47,6 +48,10 @@ import java.beans.PropertyChangeListener;
  */
 public class DarkComboBoxUI extends BasicComboBoxUI implements Border, PropertyChangeListener {
 
+    public static final String KEY_PREFIX = "JComboBox.";
+    public static final String KEY_IS_TREE_EDITOR = KEY_PREFIX + "isTreeCellEditor";
+    public static final String KEY_IS_TABLE_EDITOR = KEY_PREFIX + "isTableCellEditor";
+
     private final MouseListener mouseListener = new MouseAdapter() {
         @Override
         public void mousePressed(final MouseEvent e) {
@@ -91,11 +96,9 @@ public class DarkComboBoxUI extends BasicComboBoxUI implements Border, PropertyC
         comboBox.setBorder(this);
     }
 
-    @Override
-    protected void installDefaults() {
-        super.installDefaults();
-        LookAndFeel.installProperty(comboBox, "opaque", false);
-        arcSize = UIManager.getInt("ComboBox.arc");
+    protected static boolean isTableCellEditor(final Component c) {
+        return c instanceof JComponent
+            && Boolean.TRUE.equals(((JComponent) c).getClientProperty(KEY_IS_TABLE_EDITOR));
     }
 
     @Override
@@ -208,14 +211,16 @@ public class DarkComboBoxUI extends BasicComboBoxUI implements Border, PropertyC
         return background;
     }
 
-    protected static boolean isTableCellEditor(final Component c) {
+    protected static boolean isTreeCellEditor(final Component c) {
         return c instanceof JComponent
-            && Boolean.TRUE.equals(((JComponent) c).getClientProperty("JComboBox.isTableCellEditor"));
+            && Boolean.TRUE.equals(((JComponent) c).getClientProperty(KEY_IS_TREE_EDITOR));
     }
 
-    protected static boolean isTreeCellEditor(final Component c) {
-        return c instanceof JComponent
-            && Boolean.TRUE.equals(((JComponent) c).getClientProperty("JComboBox.isTreeCellEditor"));
+    @Override
+    protected void installDefaults() {
+        super.installDefaults();
+        LookAndFeel.installProperty(comboBox, PropertyKey.OPAQUE, false);
+        arcSize = UIManager.getInt("ComboBox.arc");
     }
 
     private Color getForeground() {
@@ -415,13 +420,14 @@ public class DarkComboBoxUI extends BasicComboBoxUI implements Border, PropertyC
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
         String key = evt.getPropertyName();
-        if ("componentOrientation".equals(key)) {
+        if (PropertyKey.COMPONENT_ORIENTATION.equals(key)) {
             comboBox.doLayout();
             comboBox.repaint();
             comboBox.getEditor().getEditorComponent().setComponentOrientation(comboBox.getComponentOrientation());
-        } else if ("editable".equals(key)) {
+        } else if (PropertyKey.EDITABLE.equals(key)) {
             comboBox.repaint();
-        } else if ("JComboBox.isTableCellEditor".equals(key) || "JComboBox.isTreeCellEditor".equals(key)) {
+        } else if (DarkComboBoxUI.KEY_IS_TABLE_EDITOR.equals(key)
+            || DarkComboBoxUI.KEY_IS_TREE_EDITOR.equals(key)) {
             comboBox.repaint();
         }
     }

core/src/main/java/com/github/weisj/darklaf/ui/combobox/DarkComboPopup.java

@@ -93,7 +93,7 @@ public class DarkComboPopup extends BasicComboPopup {
     protected JScrollPane createScroller() {
         overlayScrollPane = new OverlayScrollPane(list, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
                                                   ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
-        overlayScrollPane.getVerticalScrollBar().putClientProperty("ScrollBar.thin", Boolean.TRUE);
+        overlayScrollPane.getVerticalScrollBar().putClientProperty("JScrollBar.thin", Boolean.TRUE);
         return overlayScrollPane.getScrollPane();
     }
 

core/src/main/java/com/github/weisj/darklaf/ui/filechooser/DarkFileChooserUI.java

@@ -41,6 +41,8 @@ import java.io.File;
 
 public class DarkFileChooserUI extends DarkFileChooserUIBridge {
 
+    public static final String KEY_VIEW_TYPE = "viewType";
+
     public DarkFileChooserUI(final JFileChooser b) {
         super(b);
     }
@@ -187,7 +189,7 @@ public class DarkFileChooserUI extends DarkFileChooserUIBridge {
         topButtonPanel.add(Box.createGlue());
 
         filePane.addPropertyChangeListener(e -> {
-            if ("viewType".equals(e.getPropertyName())) {
+            if (KEY_VIEW_TYPE.equals(e.getPropertyName())) {
                 int viewType = filePane.getViewType();
                 switch (viewType) {
                     case FilePane.VIEWTYPE_LIST:

core/src/main/java/com/github/weisj/darklaf/ui/filechooser/DarkFileChooserUIBridge.java

@@ -23,6 +23,7 @@
  */
 package com.github.weisj.darklaf.ui.filechooser;
 
+import com.github.weisj.darklaf.util.PropertyKey;
 import sun.awt.shell.ShellFolder;
 import sun.swing.FilePane;
 import sun.swing.SwingUtilities2;
@@ -40,11 +41,7 @@ import javax.swing.plaf.basic.BasicDirectoryModel;
 import javax.swing.plaf.basic.BasicFileChooserUI;
 import javax.swing.plaf.metal.MetalFileChooserUI;
 import java.awt.*;
-import java.awt.event.ActionEvent;
-import java.awt.event.FocusAdapter;
-import java.awt.event.FocusEvent;
-import java.awt.event.MouseAdapter;
-import java.awt.event.MouseListener;
+import java.awt.event.*;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.io.File;
@@ -285,7 +282,7 @@ public class DarkFileChooserUIBridge extends BasicFileChooserUI {
 
         filePane.addPropertyChangeListener(new PropertyChangeListener() {
             public void propertyChange(final PropertyChangeEvent e) {
-                if ("viewType".equals(e.getPropertyName())) {
+                if (DarkFileChooserUI.KEY_VIEW_TYPE.equals(e.getPropertyName())) {
                     int viewType = filePane.getViewType();
                     switch (viewType) {
                         case FilePane.VIEWTYPE_LIST:
@@ -470,7 +467,7 @@ public class DarkFileChooserUIBridge extends BasicFileChooserUI {
                     doApproveButtonMnemonicChanged(e);
                 } else if (s.equals(JFileChooser.CONTROL_BUTTONS_ARE_SHOWN_CHANGED_PROPERTY)) {
                     doControlButtonsChanged(e);
-                } else if (s.equals("componentOrientation")) {
+                } else if (s.equals(PropertyKey.COMPONENT_ORIENTATION)) {
                     ComponentOrientation o = (ComponentOrientation) e.getNewValue();
                     JFileChooser cc = (JFileChooser) e.getSource();
                     if (o != e.getOldValue()) {
@@ -478,7 +475,7 @@ public class DarkFileChooserUIBridge extends BasicFileChooserUI {
                     }
                 } else if (Objects.equals(s, "FileChooser.useShellFolder")) {
                     doDirectoryChanged(e);
-                } else if (s.equals("ancestor")) {
+                } else if (PropertyKey.ANCESTOR.equals(s)) {
                     if (e.getOldValue() == null && e.getNewValue() != null) {
                         // Ancestor was added, set initial focus
                         fileNameTextField.selectAll();

core/src/main/java/com/github/weisj/darklaf/ui/filechooser/DarkFilePane.java

@@ -24,7 +24,8 @@
 package com.github.weisj.darklaf.ui.filechooser;
 
 import com.github.weisj.darklaf.components.OverlayScrollPane;
-import com.github.weisj.darklaf.ui.table.TextFieldTableCellEditorBorder;
+import com.github.weisj.darklaf.ui.table.DarkTableUI;
+import com.github.weisj.darklaf.ui.table.TextTableCellEditorBorder;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import sun.awt.AWTAccessor;
 import sun.swing.SwingUtilities2;
@@ -58,7 +59,7 @@ public class DarkFilePane extends DarkFilePaneUIBridge {
         megaByteString = UIManager.getString("FileChooser.fileSizeMegaBytes");
         gigaByteString = UIManager.getString("FileChooser.fileSizeGigaBytes");
         editCell = new JTextField();
-        editCell.setBorder(new TextFieldTableCellEditorBorder());
+        editCell.setBorder(new TextTableCellEditorBorder());
         editCell.putClientProperty("JTextField.listCellEditor", true);
     }
 
@@ -206,7 +207,7 @@ public class DarkFilePane extends DarkFilePaneUIBridge {
         detailsTable.addMouseListener(getMouseHandler());
 
         // 4835633 : tell BasicTableUI that this is a file list
-        detailsTable.putClientProperty("Table.isFileList", Boolean.TRUE);
+        detailsTable.putClientProperty(DarkTableUI.KEY_IS_FILE_LIST, Boolean.TRUE);
 
         if (listViewWindowsStyle) {
             detailsTable.addFocusListener(repaintListener);

core/src/main/java/com/github/weisj/darklaf/ui/filechooser/DarkFilePaneUIBridge.java

@@ -26,7 +26,9 @@ package com.github.weisj.darklaf.ui.filechooser;
 import com.github.weisj.darklaf.ui.list.DarkListCellRenderer;
 import com.github.weisj.darklaf.ui.table.DarkTableCellEditor;
 import com.github.weisj.darklaf.ui.table.DarkTableCellRenderer;
-import com.github.weisj.darklaf.ui.table.TextFieldTableCellEditorBorder;
+import com.github.weisj.darklaf.ui.table.DarkTableUI;
+import com.github.weisj.darklaf.ui.table.TextTableCellEditorBorder;
+import com.github.weisj.darklaf.util.PropertyKey;
 import sun.awt.AWTAccessor;
 import sun.awt.shell.ShellFolder;
 import sun.awt.shell.ShellFolderColumnInfo;
@@ -36,51 +38,21 @@ import sun.swing.SwingUtilities2;
 import javax.accessibility.AccessibleContext;
 import javax.swing.*;
 import javax.swing.border.Border;
-import javax.swing.event.ListDataEvent;
-import javax.swing.event.ListDataListener;
-import javax.swing.event.ListSelectionListener;
-import javax.swing.event.RowSorterEvent;
-import javax.swing.event.RowSorterListener;
-import javax.swing.event.TableModelEvent;
-import javax.swing.event.TableModelListener;
+import javax.swing.event.*;
 import javax.swing.filechooser.FileSystemView;
 import javax.swing.plaf.basic.BasicDirectoryModel;
-import javax.swing.table.AbstractTableModel;
-import javax.swing.table.DefaultTableColumnModel;
-import javax.swing.table.TableCellEditor;
-import javax.swing.table.TableCellRenderer;
-import javax.swing.table.TableColumn;
-import javax.swing.table.TableColumnModel;
-import javax.swing.table.TableModel;
-import javax.swing.table.TableRowSorter;
+import javax.swing.table.*;
 import javax.swing.text.Position;
 import java.awt.*;
-import java.awt.event.ActionEvent;
-import java.awt.event.ActionListener;
-import java.awt.event.ComponentAdapter;
-import java.awt.event.ComponentEvent;
-import java.awt.event.FocusAdapter;
-import java.awt.event.FocusEvent;
-import java.awt.event.FocusListener;
-import java.awt.event.KeyAdapter;
-import java.awt.event.KeyEvent;
-import java.awt.event.KeyListener;
-import java.awt.event.MouseAdapter;
-import java.awt.event.MouseEvent;
-import java.awt.event.MouseListener;
+import java.awt.event.*;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.text.DateFormat;
 import java.text.MessageFormat;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Comparator;
-import java.util.Date;
 import java.util.List;
-import java.util.Locale;
-import java.util.Objects;
+import java.util.*;
 import java.util.concurrent.Callable;
 
 /**
@@ -471,7 +443,7 @@ public class DarkFilePaneUIBridge extends JPanel implements PropertyChangeListen
         revalidate();
         repaint();
         updateViewMenu();
-        firePropertyChange("viewType", oldValue, viewType);
+        firePropertyChange(DarkFileChooserUI.KEY_VIEW_TYPE, oldValue, viewType);
     }
 
     public Action getViewTypeAction(final int viewType) {
@@ -741,7 +713,7 @@ public class DarkFilePaneUIBridge extends JPanel implements PropertyChangeListen
         if (tableCellEditor == null) {
             tableCellEditor = new DetailsTableCellEditor(new JTextField() {
                 {
-                    super.setBorder(new TextFieldTableCellEditorBorder());
+                    super.setBorder(new TextTableCellEditorBorder());
                 }
 
                 @Override
@@ -805,7 +777,7 @@ public class DarkFilePaneUIBridge extends JPanel implements PropertyChangeListen
         // to our JList.
 
         // 4835633 : tell BasicTableUI that this is a file list
-        detailsTable.putClientProperty("Table.isFileList", Boolean.TRUE);
+        detailsTable.putClientProperty(DarkTableUI.KEY_IS_FILE_LIST, Boolean.TRUE);
 
         if (listViewWindowsStyle) {
             detailsTable.addFocusListener(repaintListener);
@@ -1218,7 +1190,7 @@ public class DarkFilePaneUIBridge extends JPanel implements PropertyChangeListen
             applyEdit();
         } else if (s.equals("busy")) {
             setCursor((Boolean) e.getNewValue() ? waitCursor : null);
-        } else if (s.equals("componentOrientation")) {
+        } else if (s.equals(PropertyKey.COMPONENT_ORIENTATION)) {
             ComponentOrientation o = (ComponentOrientation) e.getNewValue();
             JFileChooser cc = (JFileChooser) e.getSource();
             if (o != e.getOldValue()) {

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

@@ -23,6 +23,8 @@
  */
 package com.github.weisj.darklaf.ui.internalframe;
 
+import com.github.weisj.darklaf.util.PropertyKey;
+
 import javax.swing.*;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicInternalFrameUI;
@@ -45,7 +47,7 @@ public class DarkInternalFrameUI extends BasicInternalFrameUI {
     @Override
     protected void installDefaults() {
         super.installDefaults();
-        LookAndFeel.installProperty(frame, "opaque", false);
+        LookAndFeel.installProperty(frame, PropertyKey.OPAQUE, false);
     }
 
     @Override

core/src/main/java/com/github/weisj/darklaf/ui/label/DarkLabelUI.java

@@ -26,6 +26,7 @@ package com.github.weisj.darklaf.ui.label;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.GraphicsContext;
 import com.github.weisj.darklaf.util.GraphicsUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 import sun.swing.SwingUtilities2;
 
 import javax.swing.*;
@@ -151,7 +152,7 @@ public class DarkLabelUI extends BasicLabelUI implements PropertyChangeListener
     public void propertyChange(final PropertyChangeEvent e) {
         super.propertyChange(e);
         String key = e.getPropertyName();
-        if ("componentOrientation".equals(key)) {
+        if (PropertyKey.COMPONENT_ORIENTATION.equals(key)) {
             Object source = e.getSource();
             if (source instanceof JLabel) {
                 ((JLabel) source).doLayout();

core/src/main/java/com/github/weisj/darklaf/ui/list/DarkListCellRenderer.java

@@ -43,7 +43,7 @@ public class DarkListCellRenderer extends DefaultListCellRenderer {
             }
         }
         Component comp = null;
-        boolean isEditing = Boolean.TRUE.equals(list.getClientProperty("JList.isEditing"));
+        boolean isEditing = Boolean.TRUE.equals(list.getClientProperty(DarkListUI.KEY_IS_EDITING));
         if (isEditing) {
             if (list.getSelectionModel().getLeadSelectionIndex() == index) {
                 comp = super.getListCellRendererComponent(list, value, index, false, false);
@@ -52,7 +52,7 @@ public class DarkListCellRenderer extends DefaultListCellRenderer {
         if (comp == null) {
             comp = super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
         }
-        boolean alternativeRow = Boolean.TRUE.equals(list.getClientProperty("JList.alternateRowColor"));
+        boolean alternativeRow = Boolean.TRUE.equals(list.getClientProperty(DarkListUI.KEY_ALTERNATE_ROW_COLOR));
         int layout = list.getLayoutOrientation();
         if (layout == JList.VERTICAL) {
             alternativeRow = alternativeRow && index % 2 == 1;

core/src/main/java/com/github/weisj/darklaf/ui/list/DarkListUI.java

@@ -36,6 +36,16 @@ import java.beans.PropertyChangeEvent;
  */
 public class DarkListUI extends DarkListUIBridge {
 
+    public static final String KEY_PREFIX = "JList.";
+    public static final String KEY_ALTERNATE_ROW_COLOR = KEY_PREFIX + "alternateRowColor";
+    public static final String KEY_RENDER_BOOLEAN_AS_CHECKBOX = KEY_PREFIX + "renderBooleanAsCheckBox";
+    public static final String KEY_BOOLEAN_RENDER_TYPE = KEY_PREFIX + "booleanRenderType";
+    public static final String KEY_SHRINK_WRAP = KEY_PREFIX + "shrinkWrap";
+    public static final String KEY_FULL_ROW_SELECTION = KEY_PREFIX + "fullRowSelection";
+    public static final String KEY_IS_EDITING = KEY_PREFIX + "isEditing";
+    public static final String RENDER_TYPE_CHECKBOX = "checkBox";
+    public static final String RENDER_TYPE_RADIOBUTTON = "radioButton";
+
     static {
         UIManager.put("List.cellRenderer", new DarkListCellRenderer());
     }
@@ -48,7 +58,7 @@ public class DarkListUI extends DarkListUIBridge {
     @Override
     protected void installDefaults() {
         super.installDefaults();
-        list.putClientProperty("JList.alternateRowColor", UIManager.getBoolean("List.alternateRowColor"));
+        list.putClientProperty(KEY_ALTERNATE_ROW_COLOR, UIManager.getBoolean("List.alternateRowColor"));
     }
 
     @Override
@@ -153,7 +163,7 @@ public class DarkListUI extends DarkListUIBridge {
         int ch = rowBounds.height;
 
         if (empty) {
-            boolean alternativeRow = Boolean.TRUE.equals(list.getClientProperty("JList.alternateRowColor"));
+            boolean alternativeRow = Boolean.TRUE.equals(list.getClientProperty(KEY_ALTERNATE_ROW_COLOR));
             Color alternativeRowColor = UIManager.getColor("List.alternateRowBackground");
             Color normalColor = list.getBackground();
             Color background = alternativeRow && row % 2 == 1 ? alternativeRowColor : normalColor;
@@ -165,7 +175,7 @@ public class DarkListUI extends DarkListUIBridge {
             Component rendererComponent =
                     cellRenderer.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
 
-            if (Boolean.TRUE.equals(list.getClientProperty("JList.shrinkWrap"))) {
+            if (Boolean.TRUE.equals(list.getClientProperty(KEY_SHRINK_WRAP))) {
                 // Shrink renderer to preferred size. This is mostly used on Windows
                 // where selection is only shown around the file name, instead of
                 // across the whole list cell.
@@ -186,7 +196,7 @@ public class DarkListUI extends DarkListUIBridge {
         public void propertyChange(final PropertyChangeEvent e) {
             super.propertyChange(e);
             String key = e.getPropertyName();
-            if ("JList.alternateRowColor".equals(key)) {
+            if (KEY_ALTERNATE_ROW_COLOR.equals(key)) {
                 list.repaint();
             }
         }
@@ -197,9 +207,9 @@ public class DarkListUI extends DarkListUIBridge {
             if (row < 0) {
                 // If shift is down in multi-select, we should do nothing.
                 // For single select or non-shift-click, clear the selection
-                if (isFileList && !Boolean.TRUE.equals(list.getClientProperty("JList.fullRowSelection"))
-                        && e.getID() == MouseEvent.MOUSE_PRESSED &&
-                        (!e.isShiftDown() || list.getSelectionMode() == ListSelectionModel.SINGLE_SELECTION)) {
+                if (isFileList && !Boolean.TRUE.equals(list.getClientProperty(KEY_FULL_ROW_SELECTION))
+                    && e.getID() == MouseEvent.MOUSE_PRESSED &&
+                    (!e.isShiftDown() || list.getSelectionMode() == ListSelectionModel.SINGLE_SELECTION)) {
                     list.clearSelection();
                 }
             } else {

core/src/main/java/com/github/weisj/darklaf/ui/list/DarkListUIBridge.java

@@ -28,28 +28,20 @@ import com.github.weisj.darklaf.ui.DragRecognitionSupport;
 import com.github.weisj.darklaf.util.DarkSwingUtil;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.LazyActionMap;
+import com.github.weisj.darklaf.util.PropertyKey;
 import sun.swing.DefaultLookup;
 import sun.swing.SwingUtilities2;
 import sun.swing.UIAction;
 
 import javax.swing.*;
-import javax.swing.event.ListDataEvent;
-import javax.swing.event.ListDataListener;
-import javax.swing.event.ListSelectionEvent;
-import javax.swing.event.ListSelectionListener;
-import javax.swing.event.MouseInputListener;
+import javax.swing.event.*;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicListUI;
 import javax.swing.text.Position;
 import java.awt.*;
 import java.awt.datatransfer.Transferable;
-import java.awt.event.ActionEvent;
-import java.awt.event.FocusEvent;
-import java.awt.event.FocusListener;
-import java.awt.event.KeyEvent;
-import java.awt.event.KeyListener;
-import java.awt.event.MouseEvent;
+import java.awt.event.*;
 import java.awt.geom.Point2D;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
@@ -656,7 +648,7 @@ public class DarkListUIBridge extends BasicListUI {
 
         LookAndFeel.installColorsAndFont(list, "List.background", "List.foreground", "List.font");
 
-        LookAndFeel.installProperty(list, "opaque", Boolean.TRUE);
+        LookAndFeel.installProperty(list, PropertyKey.OPAQUE, Boolean.TRUE);
 
         if (list.getCellRenderer() == null) {
             @SuppressWarnings("unchecked")
@@ -2694,8 +2686,8 @@ public class DarkListUIBridge extends BasicListUI {
             } else if (Objects.equals(propertyName, "cellRenderer")) {
                 updateLayoutStateNeeded |= cellRendererChanged;
                 redrawList();
-            } else if (Objects.equals(propertyName, "font")
-                    || DarkSwingUtil.isScaleChanged(e)) {
+            } else if (Objects.equals(propertyName, PropertyKey.FONT)
+                || DarkSwingUtil.isScaleChanged(e)) {
                 updateLayoutStateNeeded |= fontChanged;
                 redrawList();
             } else if (Objects.equals(propertyName, "prototypeCellValue")) {
@@ -2711,7 +2703,7 @@ public class DarkListUIBridge extends BasicListUI {
                 list.repaint();
             } else if (Objects.equals(propertyName, "selectionBackground")) {
                 list.repaint();
-            } else if ("layoutOrientation".equals(propertyName)) {
+            } else if (PropertyKey.LAYOUT_ORIENTATION.equals(propertyName)) {
                 updateLayoutStateNeeded |= layoutOrientationChanged;
                 layoutOrientation = list.getLayoutOrientation();
                 redrawList();
@@ -2720,7 +2712,7 @@ public class DarkListUIBridge extends BasicListUI {
                     updateLayoutStateNeeded |= layoutOrientationChanged;
                     redrawList();
                 }
-            } else if ("componentOrientation".equals(propertyName)) {
+            } else if (PropertyKey.COMPONENT_ORIENTATION.equals(propertyName)) {
                 isLeftToRight = list.getComponentOrientation().isLeftToRight();
                 updateLayoutStateNeeded |= componentOrientationChanged;
                 redrawList();

core/src/main/java/com/github/weisj/darklaf/ui/numberingpane/DarkNumberingPaneUI.java

@@ -30,17 +30,13 @@ import com.github.weisj.darklaf.components.text.NumberingPane;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.GraphicsContext;
 import com.github.weisj.darklaf.util.GraphicsUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import javax.swing.event.ChangeEvent;
 import javax.swing.event.ChangeListener;
 import javax.swing.plaf.ComponentUI;
-import javax.swing.text.BadLocationException;
-import javax.swing.text.Caret;
-import javax.swing.text.Document;
-import javax.swing.text.Element;
-import javax.swing.text.JTextComponent;
-import javax.swing.text.Position;
+import javax.swing.text.*;
 import java.awt.*;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
@@ -86,7 +82,7 @@ public class DarkNumberingPaneUI extends ComponentUI {
                                          "NumberingPane.font");
         foregroundHighlight = UIManager.getColor("NumberingPane.currentLineForeground");
         backgroundHighlight = UIManager.getColor("NumberingPane.currentLineBackground");
-        LookAndFeel.installProperty(c, "opaque", true);
+        LookAndFeel.installProperty(c, PropertyKey.OPAQUE, true);
         LookAndFeel.installBorder(c, "NumberingPane.border");
     }
 
@@ -322,7 +318,7 @@ public class DarkNumberingPaneUI extends ComponentUI {
         @Override
         public void propertyChange(final PropertyChangeEvent evt) {
             String key = evt.getPropertyName();
-            if ("caret".equals(key)) {
+            if (PropertyKey.CARET.equals(key)) {
                 if (evt.getNewValue() instanceof Caret) {
                     Object oldCaret = evt.getOldValue();
                     if (oldCaret instanceof Caret) {
@@ -335,10 +331,10 @@ public class DarkNumberingPaneUI extends ComponentUI {
                         ((Caret) newCaret).addChangeListener(currentLinePainter);
                     }
                 }
-            } else if ("font".equals(key)) {
+            } else if (PropertyKey.FONT.equals(key)) {
                 Font font = textComponent.getFont();
                 numberingPane.setFont(font.deriveFont(Math.max(font.getSize() - 1, 1.0f)));
-            } else if ("editorPane".equals(key)) {
+            } else if (NumberingPane.KEY_EDITOR.equals(key)) {
                 Object newPane = evt.getNewValue();
                 if (textComponent != null) {
                     currentLinePainter.setComponent(null);
@@ -354,7 +350,8 @@ public class DarkNumberingPaneUI extends ComponentUI {
                         currentHighlight = textComponent.getHighlighter().addHighlight(0, 0, currentLinePainter);
                         textComponent.getCaret().addChangeListener(currentLinePainter);
                         currentLinePainter.setComponent(textComponent);
-                    } catch (BadLocationException ignored) {}
+                    } catch (BadLocationException ignored) {
+                    }
                     textComponent.addPropertyChangeListener(getPropertyChangeListener());
                     textComponent.getCaret().addChangeListener(getChangeListener());
                     Font font = textComponent.getFont();
@@ -362,7 +359,7 @@ public class DarkNumberingPaneUI extends ComponentUI {
                     oldBackground = textComponent.getBackground();
                     textComponent.setBackground(UIManager.getColor("NumberingPane.textBackground"));
                 }
-            } else if ("icons".equals(key)) {
+            } else if (NumberingPane.KEY_ICONS.equals(key)) {
                 Object oldVal = evt.getOldValue();
                 Object newVal = evt.getNewValue();
                 if (oldVal instanceof Icon) {
@@ -371,7 +368,7 @@ public class DarkNumberingPaneUI extends ComponentUI {
                 if (newVal instanceof Icon) {
                     maxIconWidth = Math.max(maxIconWidth, ((Icon) newVal).getIconWidth());
                 }
-            } else if ("ancestor".equals(key)) {
+            } else if (PropertyKey.ANCESTOR.equals(key)) {
                 if (evt.getSource() == numberingPane) {
                     JScrollPane parent = DarkUIUtil.getParentOfType(JScrollPane.class, (Component) evt.getNewValue());
                     if (parent != null) {
@@ -380,7 +377,7 @@ public class DarkNumberingPaneUI extends ComponentUI {
                         viewport = null;
                     }
                 }
-            } else if ("minimumIconWidth".equals(key)) {
+            } else if (NumberingPane.KEY_MIN_ICON_WIDTH.equals(key)) {
                 maxIconWidth = calculateMaxIconWidth();
             }
         }

core/src/main/java/com/github/weisj/darklaf/ui/popupmenu/DarkPopupMenuUI.java

@@ -51,10 +51,12 @@ import java.util.List;
  */
 public class DarkPopupMenuUI extends BasicPopupMenuUI {
 
-    public static final StringBufferWrapper HIDE_POPUP_KEY = new StringBufferWrapper(new StringBuffer(
-            "doNotCancelPopup"));
+    public static final String KEY_DO_NOT_CANCEL_POPUP = "doNotCancelPopup";
+    public static final String KEY_DO_NOT_CANCEL_ON_SCROLL = "doNotCancelOnScroll";
+    public static final StringBufferWrapper HIDE_POPUP_VALUE = new StringBufferWrapper(new StringBuffer(
+        "doNotCancelPopup"));
     public static final StringBuilder MOUSE_GRABBER_KEY = new StringBuilder(
-            "javax.swing.plaf.basic.BasicPopupMenuUI.MouseGrabber");
+        "javax.swing.plaf.basic.BasicPopupMenuUI.MouseGrabber");
 
 
     public static ComponentUI createUI(final JComponent x) {
@@ -230,11 +232,11 @@ public class DarkPopupMenuUI extends BasicPopupMenuUI {
              */
                 case MouseEvent.MOUSE_PRESSED:
                     if (isInPopup(src) ||
-                            (src instanceof JMenu && ((JMenu) src).isSelected())) {
+                        (src instanceof JMenu && ((JMenu) src).isSelected())) {
                         return;
                     }
                     if (!(src instanceof JComponent) ||
-                            !HIDE_POPUP_KEY.equals(((JComponent) src).getClientProperty("doNotCancelPopup"))) {
+                        !HIDE_POPUP_VALUE.equals(((JComponent) src).getClientProperty(KEY_DO_NOT_CANCEL_POPUP))) {
                         // Cancel popup only if this property was not set.
                         // If this property is set to TRUE component wants
                         // to deal with this event by himself.
@@ -311,7 +313,7 @@ public class DarkPopupMenuUI extends BasicPopupMenuUI {
                 } else if (c instanceof JPopupMenu) {
                     return true;
                 } else if (c instanceof JComponent
-                        && Boolean.TRUE.equals(((JComponent) c).getClientProperty("doNotCancelOnScroll"))) {
+                    && Boolean.TRUE.equals(((JComponent) c).getClientProperty(KEY_DO_NOT_CANCEL_ON_SCROLL))) {
                     /*
                      * Change here: allows scrollable components that contain the popupMenu.
                      */

core/src/main/java/com/github/weisj/darklaf/ui/progressbar/DarkProgressBarUI.java

@@ -26,6 +26,7 @@ package com.github.weisj.darklaf.ui.progressbar;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.GraphicsContext;
 import com.github.weisj.darklaf.util.GraphicsUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import javax.swing.plaf.ComponentUI;
@@ -43,11 +44,14 @@ import java.beans.PropertyChangeListener;
  */
 public class DarkProgressBarUI extends BasicProgressBarUI implements PropertyChangeListener {
 
+    public static final String KEY_PREFIX = "JProgressBar.";
+    public static final String KEY_FAILED = KEY_PREFIX + "failed";
+    public static final String KEY_PASSED = KEY_PREFIX + "passed";
+
     private static final int CYCLE_TIME_DEFAULT = 800;
     private static final int REPAINT_INTERVAL_DEFAULT = 50;
     private static final int CYCLE_TIME_SIMPLIFIED = 1000;
     private static final int REPAINT_INTERVAL_SIMPLIFIED = 500;
-    private static final int DEFAULT_WIDTH = 4;
     private Color trackColor;
     private Color progressColor;
     private Color indeterminateStartColor;
@@ -56,26 +60,15 @@ public class DarkProgressBarUI extends BasicProgressBarUI implements PropertyCha
     private Color failedEndColor;
     private Color passedColor;
     private Color passedEndColor;
+    private int stripeWidth;
 
 
     public static ComponentUI createUI(final JComponent c) {
         return new DarkProgressBarUI();
     }
 
-    @Override
-    protected void installDefaults() {
-        super.installDefaults();
-        UIManager.put("ProgressBar.repaintInterval", isSimplified() ? REPAINT_INTERVAL_SIMPLIFIED : REPAINT_INTERVAL_DEFAULT);
-        UIManager.put("ProgressBar.cycleTime", isSimplified() ? CYCLE_TIME_SIMPLIFIED : CYCLE_TIME_DEFAULT);
-        trackColor = UIManager.getColor("ProgressBar.trackColor");
-        progressColor = UIManager.getColor("ProgressBar.progressColor");
-        indeterminateStartColor = UIManager.getColor("ProgressBar.indeterminateStartColor");
-        indeterminateEndColor = UIManager.getColor("ProgressBar.indeterminateEndColor");
-
-        failedColor = UIManager.getColor("ProgressBar.failedColor");
-        failedEndColor = UIManager.getColor("ProgressBar.failedEndColor");
-        passedColor = UIManager.getColor("ProgressBar.passedColor");
-        passedEndColor = UIManager.getColor("ProgressBar.passedEndColor");
+    protected static boolean hasFailed(final JComponent c) {
+        return Boolean.TRUE.equals(c.getClientProperty(KEY_FAILED));
     }
 
     @Override
@@ -180,12 +173,24 @@ public class DarkProgressBarUI extends BasicProgressBarUI implements PropertyCha
         }
     }
 
-    protected static boolean hasFailed(final JComponent c) {
-        return Boolean.TRUE.equals(c.getClientProperty("JProgressBar.failed"));
+    protected static boolean hasPassed(final JComponent c) {
+        return Boolean.TRUE.equals(c.getClientProperty(KEY_PASSED));
     }
 
-    protected static boolean hasPassed(final JComponent c) {
-        return Boolean.TRUE.equals(c.getClientProperty("JProgressBar.passed"));
+    @Override
+    protected void installDefaults() {
+        super.installDefaults();
+        UIManager.put("ProgressBar.repaintInterval", isSimplified() ? REPAINT_INTERVAL_SIMPLIFIED : REPAINT_INTERVAL_DEFAULT);
+        UIManager.put("ProgressBar.cycleTime", isSimplified() ? CYCLE_TIME_SIMPLIFIED : CYCLE_TIME_DEFAULT);
+        trackColor = UIManager.getColor("ProgressBar.trackColor");
+        progressColor = UIManager.getColor("ProgressBar.progressColor");
+        indeterminateStartColor = UIManager.getColor("ProgressBar.indeterminateStartColor");
+        indeterminateEndColor = UIManager.getColor("ProgressBar.indeterminateEndColor");
+        stripeWidth = UIManager.getInt("ProgressBar.stripeWidth");
+        failedColor = UIManager.getColor("ProgressBar.failedColor");
+        failedEndColor = UIManager.getColor("ProgressBar.failedEndColor");
+        passedColor = UIManager.getColor("ProgressBar.passedColor");
+        passedEndColor = UIManager.getColor("ProgressBar.passedEndColor");
     }
 
     protected Color getStartColor() {
@@ -321,16 +326,7 @@ public class DarkProgressBarUI extends BasicProgressBarUI implements PropertyCha
     }
 
     private int getStripeWidth() {
-        Object ho = progressBar.getClientProperty("ProgressBar.stripeWidth");
-        if (ho != null) {
-            try {
-                return Integer.parseInt(ho.toString());
-            } catch (NumberFormatException nfe) {
-                return DEFAULT_WIDTH;
-            }
-        } else {
-            return DEFAULT_WIDTH;
-        }
+        return stripeWidth;
     }
 
 
@@ -341,11 +337,11 @@ public class DarkProgressBarUI extends BasicProgressBarUI implements PropertyCha
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
         String key = evt.getPropertyName();
-        if ("JProgressBar.failed".equals(key)) {
+        if (KEY_FAILED.equals(key)) {
             progressBar.repaint();
-        } else if ("JProgressBar.passed".equals(key)) {
+        } else if (KEY_PASSED.equals(key)) {
             progressBar.repaint();
-        } else if ("componentOrientation".equals(key)) {
+        } else if (PropertyKey.COMPONENT_ORIENTATION.equals(key)) {
             progressBar.repaint();
         }
     }

core/src/main/java/com/github/weisj/darklaf/ui/radiobutton/DarkRadioButtonBorder.java

@@ -24,6 +24,7 @@
 package com.github.weisj.darklaf.ui.radiobutton;
 
 
+import com.github.weisj.darklaf.ui.button.DarkToggleButtonUI;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 
 import javax.swing.*;
@@ -64,12 +65,12 @@ public class DarkRadioButtonBorder implements Border, UIResource {
 
     protected static boolean isTreeCellEditor(final Component c) {
         return c instanceof JComponent
-                && Boolean.TRUE.equals(((JComponent) c).getClientProperty("JToggleButton.isTreeCellEditor"));
+            && Boolean.TRUE.equals(((JComponent) c).getClientProperty(DarkToggleButtonUI.KEY_IS_TREE_EDITOR));
     }
 
     protected static boolean isTableCellEditor(final Component c) {
         return c instanceof JComponent
-                && Boolean.TRUE.equals(((JComponent) c).getClientProperty("JToggleButton.isTreeCellEditor"));
+            && Boolean.TRUE.equals(((JComponent) c).getClientProperty(DarkToggleButtonUI.KEY_IS_TREE_EDITOR));
     }
 
     @Override

core/src/main/java/com/github/weisj/darklaf/ui/radiobutton/DarkRadioButtonUI.java

@@ -24,10 +24,12 @@
 package com.github.weisj.darklaf.ui.radiobutton;
 
 import com.github.weisj.darklaf.icons.EmptyIcon;
+import com.github.weisj.darklaf.ui.button.DarkToggleButtonUI;
 import com.github.weisj.darklaf.ui.checkbox.DarkCheckBoxUI;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.GraphicsContext;
 import com.github.weisj.darklaf.util.GraphicsUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 import sun.swing.SwingUtilities2;
 
 import javax.swing.*;
@@ -93,7 +95,7 @@ public class DarkRadioButtonUI extends MetalRadioButtonUI implements PropertyCha
     @Override
     public void installDefaults(final AbstractButton b) {
         super.installDefaults(b);
-        LookAndFeel.installProperty(b, "opaque", false);
+        LookAndFeel.installProperty(b, PropertyKey.OPAQUE, false);
         radioIcon = UIManager.getIcon("RadioButton.unchecked.icon");
         radioDisabledIcon = UIManager.getIcon("RadioButton.uncheckedDisabled.icon");
         radioFocusedIcon = UIManager.getIcon("RadioButton.uncheckedFocused.icon");
@@ -274,9 +276,10 @@ public class DarkRadioButtonUI extends MetalRadioButtonUI implements PropertyCha
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
         String key = evt.getPropertyName();
-        if ("componentOrientation".equals(key)) {
+        if (PropertyKey.COMPONENT_ORIENTATION.equals(key)) {
             radioButton.repaint();
-        } else if ("JToggleButton.isTreeCellEditor".equals(key) || "JToggleButton.isTableCellEditor".equals(key)) {
+        } else if (DarkToggleButtonUI.KEY_IS_TREE_EDITOR.equals(key)
+            || DarkToggleButtonUI.KEY_IS_TABLE_EDITOR.equals(key)) {
             radioButton.repaint();
         }
     }

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

@@ -27,6 +27,7 @@ package com.github.weisj.darklaf.ui.rootpane;
 import com.github.weisj.darklaf.decorations.CustomTitlePane;
 import com.github.weisj.darklaf.platform.Decorations;
 import com.github.weisj.darklaf.util.DarkUIUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import javax.swing.plaf.ComponentUI;
@@ -79,7 +80,7 @@ public class DarkRootPaneUI extends BasicRootPaneUI implements HierarchyListener
     public void propertyChange(final PropertyChangeEvent e) {
         super.propertyChange(e);
         String propertyName = e.getPropertyName();
-        if ("windowDecorationStyle".equals(propertyName)) {
+        if (PropertyKey.WINDOW_DECORATIONS_STYLE.equals(propertyName)) {
             if (!decorationStyleLock) {
                 windowDecorationsStyle = rootPane.getWindowDecorationStyle();
                 updateClientDecoration();
@@ -93,7 +94,7 @@ public class DarkRootPaneUI extends BasicRootPaneUI implements HierarchyListener
                     decorationStyleLock = false;
                 }
             }
-        } else if ("ancestor".equals(propertyName)) {
+        } else if (PropertyKey.ANCESTOR.equals(propertyName)) {
             updateWindow(rootPane.getParent());
         }
     }

core/src/main/java/com/github/weisj/darklaf/ui/scrollpane/DarkScrollBarUI.java

@@ -41,6 +41,10 @@ import java.awt.event.*;
  */
 public class DarkScrollBarUI extends BasicScrollBarUI {
 
+    public static final String KEY_PREFIX = "JScrollBar.";
+    public static final String KEY_SCROLL_PANE_PARENT = KEY_PREFIX + "scrollPaneParent";
+    public static final String KEY_FAST_WHEEL_SCROLLING = KEY_PREFIX + "fastWheelScrolling";
+    public static final String KEY_THIN = KEY_PREFIX + "thin";
     private static final float THUMB_ALPHA = 0.6f;
     private static final float MAX_TRACK_ALPHA = 0.3f;
     private static final float MAX_THUMB_ALPHA = 1;
@@ -62,7 +66,7 @@ public class DarkScrollBarUI extends BasicScrollBarUI {
         if (scrollbar.getOrientation() == JScrollBar.VERTICAL && !e.isShiftDown()
             || scrollbar.getOrientation() == JScrollBar.HORIZONTAL && e.isShiftDown()) {
             scrollbar.setValueIsAdjusting(true);
-            Object sp = scrollbar.getClientProperty("JScrollBar.scrollPaneParent");
+            Object sp = scrollbar.getClientProperty(KEY_SCROLL_PANE_PARENT);
             if (scrollbar.getParent() instanceof JScrollPane) {
                 doScroll(scrollbar, ((JScrollPane) scrollbar.getParent()).getViewport(), e,
                          scrollbar.getParent().getComponentOrientation().isLeftToRight());
@@ -177,7 +181,7 @@ public class DarkScrollBarUI extends BasicScrollBarUI {
 
             boolean limitScroll = Math.abs(e.getWheelRotation()) == 1;
 
-            Object fastWheelScroll = toScroll.getClientProperty("JScrollBar.fastWheelScrolling");
+            Object fastWheelScroll = toScroll.getClientProperty(KEY_FAST_WHEEL_SCROLLING);
             Component comp = vp == null ? null : vp.getView();
             if (Boolean.TRUE.equals(fastWheelScroll) && comp instanceof Scrollable) {
                 Scrollable scrollComp = (Scrollable) comp;
@@ -502,7 +506,7 @@ public class DarkScrollBarUI extends BasicScrollBarUI {
     }
 
     protected boolean isThin() {
-        return scrollbar.getClientProperty("ScrollBar.thin") == Boolean.TRUE;
+        return scrollbar.getClientProperty(KEY_THIN) == Boolean.TRUE;
     }
 
 

core/src/main/java/com/github/weisj/darklaf/ui/scrollpane/DarkScrollPaneUI.java

@@ -35,9 +35,11 @@ import java.beans.PropertyChangeListener;
  */
 public class DarkScrollPaneUI extends BasicScrollPaneUI {
 
+    public static final String KEY_VERTICALS_SCROLL_BAR = "verticalScrollBar";
+    public static final String KEY_HORIZONTAL_SCROLL_BAR = "horizontalScrollBar";
     private final MouseWheelListener verticalMouseWheelListener = e -> {
         if (!scrollpane.isWheelScrollingEnabled()
-                || e.getModifiersEx() == 0 || !horizontalScrollBarEnabled()) {
+            || e.getModifiersEx() == 0 || !horizontalScrollBarEnabled()) {
             return;
         }
         JScrollBar scrollbar = scrollpane.getHorizontalScrollBar();
@@ -70,7 +72,7 @@ public class DarkScrollPaneUI extends BasicScrollPaneUI {
     private final PropertyChangeListener propertyChangeListener = e -> {
         if (e.getSource() == scrollpane) {
             String propertyName = e.getPropertyName();
-            if ("verticalScrollBar".equals(propertyName)) {
+            if (KEY_VERTICALS_SCROLL_BAR.equals(propertyName)) {
                 Object old = e.getOldValue();
                 Object newVal = e.getNewValue();
                 if (old instanceof JScrollBar) {
@@ -79,7 +81,7 @@ public class DarkScrollPaneUI extends BasicScrollPaneUI {
                 if (newVal instanceof JScrollBar) {
                     ((JScrollBar) newVal).addMouseWheelListener(verticalMouseWheelListener);
                 }
-            } else if ("horizontalScrollBar".equals(propertyName)) {
+            } else if (KEY_HORIZONTAL_SCROLL_BAR.equals(propertyName)) {
                 Object old = e.getOldValue();
                 Object newVal = e.getNewValue();
                 if (old instanceof JScrollBar) {

core/src/main/java/com/github/weisj/darklaf/ui/slider/DarkSliderUI.java

@@ -27,6 +27,7 @@ import com.github.weisj.darklaf.decorators.MouseClickListener;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.GraphicsContext;
 import com.github.weisj.darklaf.util.GraphicsUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import javax.swing.plaf.ComponentUI;
@@ -34,11 +35,7 @@ import javax.swing.plaf.basic.BasicSliderUI;
 import java.awt.*;
 import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener;
-import java.awt.geom.Area;
-import java.awt.geom.Ellipse2D;
-import java.awt.geom.Path2D;
-import java.awt.geom.Rectangle2D;
-import java.awt.geom.RoundRectangle2D;
+import java.awt.geom.*;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 
@@ -47,6 +44,14 @@ import java.beans.PropertyChangeListener;
  */
 public class DarkSliderUI extends BasicSliderUI implements PropertyChangeListener {
 
+    public static final String KEY_PREFIX = "JSlider.";
+    public static final String KEY_THUMB_ARROW_SHAPE = KEY_PREFIX + "paintThumbArrowShape";
+    public static final String KEY_SHOW_VOLUME_ICON = KEY_PREFIX + "volume.showIcon";
+    public static final String KEY_VARIANT = KEY_PREFIX + "variant";
+    public static final String KEY_INSTANT_SCROLL = KEY_PREFIX + "instantScrollEnabled";
+    public static final String KEY_SHOW_FOCUS_GLOW = KEY_PREFIX + "paintFocusGlow";
+    public static final String VARIANT_VOLUME = "volume";
+
     private static final int ICON_BAR_EXT = 5;
     private static final int ICON_PAD = 10;
     private final Rectangle iconRect = new Rectangle(0, 0, 0, 0);
@@ -105,43 +110,13 @@ public class DarkSliderUI extends BasicSliderUI implements PropertyChangeListene
         return new DarkSliderUI((JSlider) c);
     }
 
-    @Override
-    public void installUI(final JComponent c) {
-        super.installUI(c);
-        slider.putClientProperty("Slider.paintFocusGlow", UIManager.getBoolean("Slider.paintFocusGlow"));
+    private static boolean showVolumeIcon(final JComponent c) {
+        return isVolumeSlider(c)
+            && Boolean.TRUE.equals(c.getClientProperty(KEY_SHOW_VOLUME_ICON));
     }
 
-    @Override
-    protected void installDefaults(final JSlider slider) {
-        super.installDefaults(slider);
-        LookAndFeel.installProperty(slider, "opaque", false);
-        arcSize = UIManager.getInt("Slider.arc");
-        trackSize = UIManager.getInt("Slider.trackThickness");
-        plainThumbRadius = UIManager.getInt("Slider.plainThumbRadius");
-        thumbSize = UIManager.getDimension("Slider.thumbSize");
-        inactiveTickForeground = UIManager.getColor("Slider.disabledTickColor");
-        trackBackground = UIManager.getColor("Slider.trackBackground");
-        selectedTrackBackground = UIManager.getColor("Slider.selectedTrackColor");
-        selectedTrackInactiveBackground = UIManager.getColor("Slider.disabledTrackColor");
-        selectedVolumeTrackBackground = UIManager.getColor("Slider.volume.selectedTrackColor");
-        selectedVolumeTrackInactiveBackground = UIManager.getColor("Slider.volume.disabledTrackColor");
-        thumbBackground = UIManager.getColor("Slider.activeThumbFill");
-        thumbInactiveBackground = UIManager.getColor("Slider.inactiveThumbFill");
-        volumeThumbBackground = UIManager.getColor("Slider.volume.activeThumbFill");
-        volumeThumbInactiveBackground = UIManager.getColor("Slider.volume.inactiveThumbFill");
-        thumbBorderColor = UIManager.getColor("Slider.thumbBorderColor");
-        thumbInactiveBorderColor = UIManager.getColor("Slider.thumbBorderColorDisabled");
-
-        volume0 = UIManager.getIcon("Slider.volume.enabled_level_0.icon");
-        volume1 = UIManager.getIcon("Slider.volume.enabled_level_1.icon");
-        volume2 = UIManager.getIcon("Slider.volume.enabled_level_2.icon");
-        volume3 = UIManager.getIcon("Slider.volume.enabled_level_3.icon");
-        volume4 = UIManager.getIcon("Slider.volume.enabled_level_4.icon");
-        volume0Inactive = UIManager.getIcon("Slider.volume.disabled_level_0.icon");
-        volume1Inactive = UIManager.getIcon("Slider.volume.disabled_level_1.icon");
-        volume2Inactive = UIManager.getIcon("Slider.volume.disabled_level_2.icon");
-        volume3Inactive = UIManager.getIcon("Slider.volume.disabled_level_3.icon");
-        volume4Inactive = UIManager.getIcon("Slider.volume.disabled_level_4.icon");
+    private static boolean isVolumeSlider(final JComponent c) {
+        return VARIANT_VOLUME.equals(c.getClientProperty(KEY_VARIANT));
     }
 
     @Override
@@ -328,15 +303,43 @@ public class DarkSliderUI extends BasicSliderUI implements PropertyChangeListene
         return inactiveTickForeground;
     }
 
-    protected boolean isPlainThumb() {
-        Boolean paintThumbArrowShape = (Boolean) slider.getClientProperty("Slider.paintThumbArrowShape");
-        return (!slider.getPaintTicks() && paintThumbArrowShape == null) ||
-                paintThumbArrowShape == Boolean.FALSE;
+    @Override
+    public void installUI(final JComponent c) {
+        super.installUI(c);
+        slider.putClientProperty(KEY_SHOW_FOCUS_GLOW, UIManager.getBoolean("Slider.paintFocusGlow"));
     }
 
-    private static boolean showVolumeIcon(final JComponent c) {
-        return isVolumeSlider(c)
-                && Boolean.TRUE.equals(c.getClientProperty("Slider.volume.showIcon"));
+    @Override
+    protected void installDefaults(final JSlider slider) {
+        super.installDefaults(slider);
+        LookAndFeel.installProperty(slider, PropertyKey.OPAQUE, false);
+        arcSize = UIManager.getInt("Slider.arc");
+        trackSize = UIManager.getInt("Slider.trackThickness");
+        plainThumbRadius = UIManager.getInt("Slider.plainThumbRadius");
+        thumbSize = UIManager.getDimension("Slider.thumbSize");
+        inactiveTickForeground = UIManager.getColor("Slider.disabledTickColor");
+        trackBackground = UIManager.getColor("Slider.trackBackground");
+        selectedTrackBackground = UIManager.getColor("Slider.selectedTrackColor");
+        selectedTrackInactiveBackground = UIManager.getColor("Slider.disabledTrackColor");
+        selectedVolumeTrackBackground = UIManager.getColor("Slider.volume.selectedTrackColor");
+        selectedVolumeTrackInactiveBackground = UIManager.getColor("Slider.volume.disabledTrackColor");
+        thumbBackground = UIManager.getColor("Slider.activeThumbFill");
+        thumbInactiveBackground = UIManager.getColor("Slider.inactiveThumbFill");
+        volumeThumbBackground = UIManager.getColor("Slider.volume.activeThumbFill");
+        volumeThumbInactiveBackground = UIManager.getColor("Slider.volume.inactiveThumbFill");
+        thumbBorderColor = UIManager.getColor("Slider.thumbBorderColor");
+        thumbInactiveBorderColor = UIManager.getColor("Slider.thumbBorderColorDisabled");
+
+        volume0 = UIManager.getIcon("Slider.volume.enabled_level_0.icon");
+        volume1 = UIManager.getIcon("Slider.volume.enabled_level_1.icon");
+        volume2 = UIManager.getIcon("Slider.volume.enabled_level_2.icon");
+        volume3 = UIManager.getIcon("Slider.volume.enabled_level_3.icon");
+        volume4 = UIManager.getIcon("Slider.volume.enabled_level_4.icon");
+        volume0Inactive = UIManager.getIcon("Slider.volume.disabled_level_0.icon");
+        volume1Inactive = UIManager.getIcon("Slider.volume.disabled_level_1.icon");
+        volume2Inactive = UIManager.getIcon("Slider.volume.disabled_level_2.icon");
+        volume3Inactive = UIManager.getIcon("Slider.volume.disabled_level_3.icon");
+        volume4Inactive = UIManager.getIcon("Slider.volume.disabled_level_4.icon");
     }
 
     protected void calculateIconRect() {
@@ -468,8 +471,10 @@ public class DarkSliderUI extends BasicSliderUI implements PropertyChangeListene
         g.translate(-x, -y);
     }
 
-    private static boolean isVolumeSlider(final JComponent c) {
-        return "volume".equals(c.getClientProperty("Slider.variant"));
+    protected boolean isPlainThumb() {
+        Boolean paintThumbArrowShape = (Boolean) slider.getClientProperty(KEY_THUMB_ARROW_SHAPE);
+        return (!slider.getPaintTicks() && paintThumbArrowShape == null) ||
+            paintThumbArrowShape == Boolean.FALSE;
     }
 
     private void paintSliderThumb(final Graphics2D g) {
@@ -489,7 +494,7 @@ public class DarkSliderUI extends BasicSliderUI implements PropertyChangeListene
     }
 
     private boolean paintFocus() {
-        return slider.hasFocus() && Boolean.TRUE.equals(slider.getClientProperty("Slider.paintFocusGlow"));
+        return slider.hasFocus() && Boolean.TRUE.equals(slider.getClientProperty(KEY_SHOW_FOCUS_GLOW));
     }
 
     private Path2D getThumbShape() {
@@ -576,15 +581,15 @@ public class DarkSliderUI extends BasicSliderUI implements PropertyChangeListene
     }
 
     private boolean instantScrollEnabled(final JComponent c) {
-        return Boolean.TRUE.equals(c.getClientProperty("Slider.instantScrollEnabled"));
+        return Boolean.TRUE.equals(c.getClientProperty(KEY_INSTANT_SCROLL));
     }
 
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
         String key = evt.getPropertyName();
-        if ("Slider.variant".equals(key)) {
+        if (KEY_VARIANT.equals(key)) {
             slider.repaint();
-        } else if ("Slider.volume.showIcon".equals(key)) {
+        } else if (DarkSliderUI.KEY_SHOW_VOLUME_ICON.equals(key)) {
             calculateGeometry();
             slider.repaint();
         }

core/src/main/java/com/github/weisj/darklaf/ui/spinner/DarkSpinnerUI.java

@@ -26,6 +26,7 @@ package com.github.weisj.darklaf.ui.spinner;
 import com.github.weisj.darklaf.components.ArrowButton;
 import com.github.weisj.darklaf.decorators.LayoutManagerDelegate;
 import com.github.weisj.darklaf.util.DarkUIUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import javax.swing.border.Border;
@@ -47,6 +48,14 @@ import java.beans.PropertyChangeListener;
  */
 public class DarkSpinnerUI extends BasicSpinnerUI implements PropertyChangeListener {
 
+    public static final String KEY_PREFIX = "JSpinner.";
+    public static final String KEY_VARIANT = KEY_PREFIX + "variant";
+    public static final String KEY_IS_TREE_EDITOR = KEY_PREFIX + "isTreeCellEditor";
+    public static final String KEY_IS_TREE_RENDER = KEY_PREFIX + "isTreeCellRenderer";
+    public static final String KEY_IS_TABLE_EDITOR = KEY_PREFIX + "isTableCellEditor";
+    public static final String KEY_IS_TABLE_RENDERER = KEY_PREFIX + "isTableCellRenderer";
+    public static final String KEY_EDITOR_ALIGNMENT = KEY_PREFIX + "cellEditorAlignment";
+    public static final String VARIANT_PLUS_MINUS = "plusMinus";
     private final FocusListener focusListener = new FocusAdapter() {
         @Override
         public void focusGained(final FocusEvent e) {
@@ -80,7 +89,6 @@ public class DarkSpinnerUI extends BasicSpinnerUI implements PropertyChangeListe
     protected Icon plusInactiveIcon;
     protected Icon minusInactiveIcon;
     private JComponent editor;
-    private Color compColor;
     private JButton prevButton;
     private Component editorComponent;
 
@@ -90,7 +98,7 @@ public class DarkSpinnerUI extends BasicSpinnerUI implements PropertyChangeListe
     }
 
     protected static boolean usePlusMinusIcons(final JSpinner spinner) {
-        return "plusMinus".equals(spinner.getClientProperty("JSpinner.variant"));
+        return VARIANT_PLUS_MINUS.equals(spinner.getClientProperty(KEY_VARIANT));
     }
 
     @Override
@@ -107,26 +115,9 @@ public class DarkSpinnerUI extends BasicSpinnerUI implements PropertyChangeListe
         spinner.removePropertyChangeListener(this);
     }
 
-    @Override
-    protected void installDefaults() {
-        super.installDefaults();
-        arc = UIManager.getInt("Spinner.arc");
-        borderSize = UIManager.getInt("Spinner.borderThickness");
-        background = UIManager.getColor("Spinner.activeBackground");
-        inactiveBackground = UIManager.getColor("Spinner.inactiveBackground");
-        arrowBackgroundStart = UIManager.getColor("Spinner.arrowBackgroundStart");
-        arrowBackgroundEnd = UIManager.getColor("Spinner.arrowBackgroundEnd");
-
-        arrowDownIcon = UIManager.getIcon("Spinner.arrowDown.icon");
-        arrowUpIcon = UIManager.getIcon("Spinner.arrowUp.icon");
-        minusIcon = UIManager.getIcon("Spinner.minus.icon");
-        plusIcon = UIManager.getIcon("Spinner.plus.icon");
-
-        arrowDownInactiveIcon = UIManager.getIcon("Spinner.arrowDownInactive.icon");
-        arrowUpInactiveIcon = UIManager.getIcon("Spinner.arrowUpInactive.icon");
-        minusInactiveIcon = UIManager.getIcon("Spinner.minusInactive.icon");
-        plusInactiveIcon = UIManager.getIcon("Spinner.plusInactive.icon");
-        LookAndFeel.installProperty(spinner, "opaque", false);
+    protected static boolean isTableCellEditor(final Component c) {
+        return c instanceof JComponent
+            && Boolean.TRUE.equals(((JComponent) c).getClientProperty(KEY_IS_TABLE_EDITOR));
     }
 
     protected LayoutManager createLayout() {
@@ -266,14 +257,31 @@ public class DarkSpinnerUI extends BasicSpinnerUI implements PropertyChangeListe
         return c == null || !c.isEnabled() ? inactiveBackground : background;
     }
 
-    protected static boolean isTableCellEditor(final Component c) {
+    protected static boolean isTreeCellEditor(final Component c) {
         return c instanceof JComponent
-                && Boolean.TRUE.equals(((JComponent) c).getClientProperty("JSpinner.isTableCellEditor"));
+            && Boolean.TRUE.equals(((JComponent) c).getClientProperty(KEY_IS_TREE_EDITOR));
     }
 
-    protected static boolean isTreeCellEditor(final Component c) {
-        return c instanceof JComponent
-                && Boolean.TRUE.equals(((JComponent) c).getClientProperty("JSpinner.isTreeCellEditor"));
+    @Override
+    protected void installDefaults() {
+        super.installDefaults();
+        arc = UIManager.getInt("Spinner.arc");
+        borderSize = UIManager.getInt("Spinner.borderThickness");
+        background = UIManager.getColor("Spinner.activeBackground");
+        inactiveBackground = UIManager.getColor("Spinner.inactiveBackground");
+        arrowBackgroundStart = UIManager.getColor("Spinner.arrowBackgroundStart");
+        arrowBackgroundEnd = UIManager.getColor("Spinner.arrowBackgroundEnd");
+
+        arrowDownIcon = UIManager.getIcon("Spinner.arrowDown.icon");
+        arrowUpIcon = UIManager.getIcon("Spinner.arrowUp.icon");
+        minusIcon = UIManager.getIcon("Spinner.minus.icon");
+        plusIcon = UIManager.getIcon("Spinner.plus.icon");
+
+        arrowDownInactiveIcon = UIManager.getIcon("Spinner.arrowDownInactive.icon");
+        arrowUpInactiveIcon = UIManager.getIcon("Spinner.arrowUpInactive.icon");
+        minusInactiveIcon = UIManager.getIcon("Spinner.minusInactive.icon");
+        plusInactiveIcon = UIManager.getIcon("Spinner.plusInactive.icon");
+        LookAndFeel.installProperty(spinner, PropertyKey.OPAQUE, false);
     }
 
     private void paintSpinBackground(final Graphics2D g, final int width, final int height,
@@ -307,13 +315,13 @@ public class DarkSpinnerUI extends BasicSpinnerUI implements PropertyChangeListe
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
         String key = evt.getPropertyName();
-        if ("opaque".equals(key)) {
+        if (PropertyKey.OPAQUE.equals(key)) {
             boolean val = Boolean.TRUE.equals(evt.getNewValue());
             spinner.getEditor().setOpaque(val);
             if (editorComponent instanceof JComponent) {
                 ((JComponent) editorComponent).setOpaque(val);
             }
-        } else if ("JSpinner.isTableCellEditor".equals(key)) {
+        } else if (KEY_IS_TABLE_EDITOR.equals(key)) {
             if (Boolean.FALSE.equals(evt.getNewValue())) {
                 if (editor instanceof JSpinner.DefaultEditor) {
                     // if editor alignment isn't set in LAF, we get 0 (CENTER) here
@@ -323,14 +331,14 @@ public class DarkSpinnerUI extends BasicSpinnerUI implements PropertyChangeListe
                 }
             }
             spinner.repaint();
-        } else if ("JSpinner.cellEditorAlignment".equals(key) && isTableCellEditor(spinner)) {
+        } else if (KEY_EDITOR_ALIGNMENT.equals(key) && isTableCellEditor(spinner)) {
             if (editorComponent instanceof JTextField && evt.getNewValue() instanceof Integer) {
                 ((JTextField) editorComponent).setHorizontalAlignment((Integer) evt.getNewValue());
             }
             spinner.repaint();
-        } else if ("JSpinner.variant".equals(key)) {
+        } else if (KEY_VARIANT.equals(key)) {
             spinner.repaint();
-        } else if ("JSpinner.isTreeCellEditor".equals(key)) {
+        } else if (KEY_IS_TREE_EDITOR.equals(key)) {
             spinner.repaint();
         }
     }

core/src/main/java/com/github/weisj/darklaf/ui/splitpane/DarkSplitPaneUI.java

@@ -24,6 +24,7 @@
 package com.github.weisj.darklaf.ui.splitpane;
 
 import com.github.weisj.darklaf.decorators.LayoutManagerDelegate;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import javax.swing.plaf.ComponentUI;
@@ -38,6 +39,12 @@ import java.beans.PropertyChangeListener;
  */
 public class DarkSplitPaneUI extends BasicSplitPaneUI implements PropertyChangeListener {
 
+    public static final String KEY_PREFIX = "JSplitPane.";
+    public static final String KEY_STYLE = KEY_PREFIX + "style";
+    public static final String STYLE_GRIP = "grip";
+    public static final String STYLE_LINE = "line";
+    public static final String STYLE_INVISIBLE = "invisible";
+
     private static final int DIVIDER_DRAG_SIZE = 10;
     private static final int DIVIDER_DRAG_OFFSET = 5;
     private Style style;
@@ -120,7 +127,7 @@ public class DarkSplitPaneUI extends BasicSplitPaneUI implements PropertyChangeL
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
         String key = evt.getPropertyName();
-        if ("JSplitPane.style".equals(key)) {
+        if (KEY_STYLE.equals(key)) {
             Object val = evt.getNewValue();
             Style oldStyle = style;
             if (Style.INVISIBLE.name.equals(val)) {
@@ -137,7 +144,7 @@ public class DarkSplitPaneUI extends BasicSplitPaneUI implements PropertyChangeL
                     splitPane.doLayout();
                 }
             }
-        } else if ("orientation".equals(key)) {
+        } else if (PropertyKey.ORIENTATION.equals(key)) {
             splitPane.doLayout();
         }
     }
@@ -147,9 +154,9 @@ public class DarkSplitPaneUI extends BasicSplitPaneUI implements PropertyChangeL
     }
 
     private enum Style {
-        GRIP("grip"),
-        LINE("line"),
-        INVISIBLE("invisible");
+        GRIP(STYLE_GRIP),
+        LINE(STYLE_LINE),
+        INVISIBLE(STYLE_INVISIBLE);
 
         final private String name;
 

core/src/main/java/com/github/weisj/darklaf/ui/tabbedpane/DarkHandler.java

@@ -23,6 +23,8 @@
  */
 package com.github.weisj.darklaf.ui.tabbedpane;
 
+import com.github.weisj.darklaf.util.PropertyKey;
+
 import javax.swing.*;
 import javax.swing.event.ChangeEvent;
 import javax.swing.plaf.UIResource;
@@ -48,32 +50,32 @@ public class DarkHandler extends TabbedPaneHandler {
     public void propertyChange(final PropertyChangeEvent e) {
         super.propertyChange(e);
         String key = e.getPropertyName();
-        if ("TabbedPane.maxPopupHeight".equals(key)) {
+        if (DarkTabbedPaneUI.KEY_MAX_POPUP_HEIGHT.equals(key)) {
             Integer newVal = (Integer) e.getNewValue();
             if (newVal != null && newVal >= 0) {
                 ui.scrollableTabSupport.scrollPopupMenu.setMaxHeight(newVal);
             }
-        } else if ("JTabbedPane.tabAreaInsets".equals(key)) {
+        } else if (DarkTabbedPaneUI.KEY_TAB_AREA_INSETS.equals(key)) {
             Object ins = e.getNewValue();
             if (ins instanceof Insets) {
                 ui.tabAreaInsets = (Insets) ins;
             } else if (ins == null) {
                 ui.tabAreaInsets = new Insets(0, 0, 0, 0);
             }
-        } else if ("JTabbedPane.contentBorderInsets".equals(key)) {
+        } else if (DarkTabbedPaneUI.KEY_CONTENT_BORDER_INSETS.equals(key)) {
             Object ins = e.getNewValue();
             if (ins instanceof Insets) {
                 ui.contentBorderInsets = (Insets) ins;
             } else if (ins == null) {
                 ui.contentBorderInsets = new Insets(0, 0, 0, 0);
             }
-        } else if ("tabPlacement".equals(key)) {
+        } else if (DarkTabbedPaneUI.KEY_TAB_PLACEMENT.equals(key)) {
             if (ui.scrollableTabLayoutEnabled()) {
                 ui.currentShiftX = 0;
                 ui.currentShiftY = 0;
                 ui.scrollLayout.calculateTabRects(ui.tabPane.getTabPlacement(), ui.tabPane.getTabCount());
             }
-        } else if ("JTabbedPane.showNewTabButton".equals(key)) {
+        } else if (DarkTabbedPaneUI.KEY_SHOW_NEW_TAB_BUTTON.equals(key)) {
             Object val = e.getNewValue();
             if (val instanceof Boolean && ui.scrollableTabLayoutEnabled()) {
                 boolean show = (Boolean) val;
@@ -84,7 +86,7 @@ public class DarkHandler extends TabbedPaneHandler {
             }
             ui.tabPane.doLayout();
             ui.tabPane.repaint();
-        } else if ("JTabbedPane.leadingComponent".equals(key)) {
+        } else if (DarkTabbedPaneUI.KEY_LEADING_COMP.equals(key)) {
             ui.tabPane.remove(ui.leadingComp);
             Object val = e.getNewValue();
             if (val instanceof Component) {
@@ -94,7 +96,7 @@ public class DarkHandler extends TabbedPaneHandler {
                 ui.leadingComp = null;
             }
             ui.tabPane.doLayout();
-        } else if ("JTabbedPane.trailingComponent".equals(key)) {
+        } else if (DarkTabbedPaneUI.KEY_TRAILING_COMP.equals(key)) {
             ui.tabPane.remove(ui.trailingComp);
             Object val = e.getNewValue();
             if (val instanceof Component) {
@@ -104,13 +106,13 @@ public class DarkHandler extends TabbedPaneHandler {
                 ui.trailingComp = null;
             }
             ui.tabPane.doLayout();
-        } else if ("JTabbedPane.dndEnabled".equals(key)) {
-            ui.dndEnabled = Boolean.TRUE.equals(ui.tabPane.getClientProperty("JTabbedPane.dndEnabled"));
+        } else if (DarkTabbedPaneUI.KEY_DND.equals(key)) {
+            ui.dndEnabled = Boolean.TRUE.equals(ui.tabPane.getClientProperty(DarkTabbedPaneUI.KEY_DND));
             ui.tabPane.getDropTarget().setActive(ui.dndEnabled);
-        } else if ("componentOrientation".equals(key)) {
+        } else if (PropertyKey.COMPONENT_ORIENTATION.equals(key)) {
             ui.tabPane.doLayout();
             ui.tabPane.repaint();
-        } else if ("JTabbedPane.northComponent".equals(key)) {
+        } else if (DarkTabbedPaneUI.KEY_NORTH_COMP.equals(key)) {
             ui.tabPane.remove(ui.northComp);
             Object val = e.getNewValue();
             if (val instanceof Component) {
@@ -120,7 +122,7 @@ public class DarkHandler extends TabbedPaneHandler {
                 ui.northComp = null;
             }
             ui.tabPane.doLayout();
-        } else if ("JTabbedPane.southComponent".equals(key)) {
+        } else if (DarkTabbedPaneUI.KEY_SOUTH_COMP.equals(key)) {
             ui.tabPane.remove(ui.southComp);
             Object val = e.getNewValue();
             if (val instanceof Component) {
@@ -130,7 +132,7 @@ public class DarkHandler extends TabbedPaneHandler {
                 ui.southComp = null;
             }
             ui.tabPane.doLayout();
-        } else if ("JTabbedPane.eastComponent".equals(key)) {
+        } else if (DarkTabbedPaneUI.KEY_EAST_COMP.equals(key)) {
             ui.tabPane.remove(ui.eastComp);
             Object val = e.getNewValue();
             if (val instanceof Component) {
@@ -140,7 +142,7 @@ public class DarkHandler extends TabbedPaneHandler {
                 ui.eastComp = null;
             }
             ui.tabPane.doLayout();
-        } else if ("JTabbedPane.westComponent".equals(key)) {
+        } else if (DarkTabbedPaneUI.KEY_WEST_COMP.equals(key)) {
             ui.tabPane.remove(ui.westComp);
             Object val = e.getNewValue();
             if (val instanceof Component) {

core/src/main/java/com/github/weisj/darklaf/ui/tabbedpane/DarkScrollableTabSupport.java

@@ -59,9 +59,9 @@ public class DarkScrollableTabSupport extends ScrollableTabSupport implements Mo
         moreTabsButton.addActionListener(this);
 
         newTabButton = ui.createNewTabButton();
-        newTabButton.setVisible(Boolean.TRUE.equals(ui.tabPane.getClientProperty("JTabbedPane.showNewTabButton")));
+        newTabButton.setVisible(Boolean.TRUE.equals(ui.tabPane.getClientProperty(DarkTabbedPaneUI.KEY_SHOW_NEW_TAB_BUTTON)));
 
-        scrollPopupMenu = new ScrollPopupMenu(UIManager.getInt("TabbedPane.maxPopupHeight"));
+        scrollPopupMenu = new ScrollPopupMenu(UIManager.getInt(DarkTabbedPaneUI.KEY_MAX_POPUP_HEIGHT));
         PopupMenuListener popupMenuListener = new PopupMenuAdapter() {
             @Override
             public void popupMenuWillBecomeInvisible(final PopupMenuEvent e) {

core/src/main/java/com/github/weisj/darklaf/ui/tabbedpane/DarkTabbedPaneUI.java

@@ -37,12 +37,30 @@ import java.awt.event.FocusEvent;
 import java.awt.event.FocusListener;
 import java.awt.event.MouseEvent;
 import java.util.TooManyListenersException;
+import java.util.function.Consumer;
 
 /**
  * @author Jannis Weis
  */
 public class DarkTabbedPaneUI extends DarkTabbedPaneUIBridge {
 
+    public static final String KEY_PREFIX = "JTabbedPane.";
+    public static final String KEY_DND = KEY_PREFIX + "dndEnabled";
+    public static final String KEY_NORTH_COMP = KEY_PREFIX + "northComponent";
+    public static final String KEY_WEST_COMP = KEY_PREFIX + "westComponent";
+    public static final String KEY_EAST_COMP = KEY_PREFIX + "eastComponent";
+    public static final String KEY_SOUTH_COMP = KEY_PREFIX + "southComponent";
+    public static final String KEY_LEADING_COMP = KEY_PREFIX + "leadingComponent";
+    public static final String KEY_TRAILING_COMP = KEY_PREFIX + "trailingComponent";
+    public static final String KEY_SHOW_NEW_TAB_BUTTON = KEY_PREFIX + "showNewTabButton";
+    public static final String KEY_DRAW_FOCUS_BAR = KEY_PREFIX + "drawFocusBar";
+    public static final String KEY_TAB_PLACEMENT = "tabPlacement";
+    public static final String KEY_CONTENT_BORDER_INSETS = KEY_PREFIX + "contentBorderInsets";
+    public static final String KEY_TAB_AREA_INSETS = KEY_PREFIX + "tabAreaInsets";
+    public static final String KEY_MAX_POPUP_HEIGHT = KEY_PREFIX + "maxPopupHeight";
+    public static final String KEY_NEW_TAB_ACTION = KEY_PREFIX + "newTabAction";
+    public static final String KEY_ROTATE_TAB_RUNS = KEY_PREFIX + "rotateTabRuns";
+
     protected static final TabbedPaneTransferHandler TRANSFER_HANDLER = new TabbedPaneTransferHandler.UIResource();
     protected final FocusListener focusListener = new FocusListener() {
         @Override
@@ -79,6 +97,7 @@ public class DarkTabbedPaneUI extends DarkTabbedPaneUIBridge {
     protected int dropSourceIndex = -1;
     protected boolean sourceEqualsTarget;
     protected boolean drawDropRect;
+    protected int focusSize;
 
     protected boolean dragging;
     protected Rectangle dragRect = new Rectangle();
@@ -115,7 +134,7 @@ public class DarkTabbedPaneUI extends DarkTabbedPaneUIBridge {
     }
 
     protected Action getNewTabAction() {
-        Object action = tabPane.getClientProperty("JTabbedPane.newTabAction");
+        Object action = tabPane.getClientProperty(KEY_NEW_TAB_ACTION);
         return action instanceof Action ? (Action) action : null;
     }
 
@@ -234,7 +253,6 @@ public class DarkTabbedPaneUI extends DarkTabbedPaneUIBridge {
         if (isSelected) {
             if (!drawFocusBar()) return;
             g.setColor(getAccentColor());
-            int focusSize = UIManager.getInt("TabbedPane.focusBarHeight");
             switch (tabPlacement) {
                 case LEFT:
                     g.fillRect(r.x + r.width - focusSize, r.y, focusSize, r.height);
@@ -382,7 +400,7 @@ public class DarkTabbedPaneUI extends DarkTabbedPaneUIBridge {
     }
 
     protected boolean shouldRotateTabRuns(final int tabPlacement) {
-        return Boolean.TRUE.equals(tabPane.getClientProperty("JTabbedPane.rotateTabRuns"));
+        return Boolean.TRUE.equals(tabPane.getClientProperty(KEY_ROTATE_TAB_RUNS));
     }
 
     @Override
@@ -458,7 +476,7 @@ public class DarkTabbedPaneUI extends DarkTabbedPaneUIBridge {
     }
 
     protected boolean drawFocusBar() {
-        return !Boolean.FALSE.equals(tabPane.getClientProperty("JTabbedPane.drawFocusBar"));
+        return !Boolean.FALSE.equals(tabPane.getClientProperty(KEY_DRAW_FOCUS_BAR));
     }
 
     protected Color getAccentColor() {
@@ -698,55 +716,41 @@ public class DarkTabbedPaneUI extends DarkTabbedPaneUIBridge {
         hoverBackground = UIManager.getColor("TabbedPane.hoverBackground");
         tabAreaBackground = UIManager.getColor("TabbedPane.tabAreaBackground");
 
+        focusSize = UIManager.getInt("TabbedPane.focusBarHeight");
         moreTabsIcon = UIManager.getIcon("TabbedPane.moreTabs.icon");
         newTabIcon = UIManager.getIcon("TabbedPane.newTab.icon");
 
-        Object ins = tabPane.getClientProperty("JTabbedPane.tabAreaInsets");
+        Object ins = tabPane.getClientProperty(KEY_TAB_AREA_INSETS);
         if (ins instanceof Insets) {
             tabAreaInsets = (Insets) ins;
         }
-        ins = tabPane.getClientProperty("JTabbedPane.contentBorderInsets");
+        ins = tabPane.getClientProperty(KEY_CONTENT_BORDER_INSETS);
         if (ins instanceof Insets) {
             contentBorderInsets = (Insets) ins;
         }
-        Object lead = tabPane.getClientProperty("JTabbedPane.leadingComponent");
-        if (lead instanceof Component) {
-            leadingComp = wrapClientComponent((Component) lead);
-            tabPane.add(leadingComp);
-        }
-        Object trail = tabPane.getClientProperty("JTabbedPane.trailingComponent");
-        if (trail instanceof Component) {
-            trailingComp = wrapClientComponent((Component) trail);
-            tabPane.add(trailingComp);
-        }
-        Object north = tabPane.getClientProperty("JTabbedPane.northComponent");
-        if (north instanceof Component) {
-            northComp = wrapClientComponent((Component) north);
-            tabPane.add(northComp);
-        }
-        Object south = tabPane.getClientProperty("JTabbedPane.southComponent");
-        if (south instanceof Component) {
-            southComp = wrapClientComponent((Component) south);
-            tabPane.add(southComp);
-        }
-        Object west = tabPane.getClientProperty("JTabbedPane.westComponent");
-        if (west instanceof Component) {
-            westComp = wrapClientComponent((Component) west);
-            tabPane.add(westComp);
-        }
-        Object east = tabPane.getClientProperty("JTabbedPane.eastComponent");
-        if (east instanceof Component) {
-            eastComp = wrapClientComponent((Component) east);
-            tabPane.add(eastComp);
+        installComponent(KEY_LEADING_COMP, c -> leadingComp = c);
+        installComponent(KEY_TRAILING_COMP, c -> trailingComp = c);
+        installComponent(KEY_NORTH_COMP, c -> northComp = c);
+        installComponent(KEY_SOUTH_COMP, c -> southComp = c);
+        installComponent(KEY_WEST_COMP, c -> westComp = c);
+        installComponent(KEY_EAST_COMP, c -> eastComp = c);
+        dndEnabled = Boolean.TRUE.equals(tabPane.getClientProperty(KEY_DND));
+    }
+
+    protected void installComponent(final String key, final Consumer<Component> setter) {
+        Object comp = tabPane.getClientProperty(key);
+        if (comp instanceof Component) {
+            Component wrapped = wrapClientComponent((Component) comp);
+            setter.accept(wrapped);
+            tabPane.add(wrapped);
         }
-        dndEnabled = Boolean.TRUE.equals(tabPane.getClientProperty("JTabbedPane.dndEnabled"));
     }
 
     @Override
     public Rectangle getTabBounds(final JTabbedPane pane, final int i) {
         Rectangle rect = super.getTabBounds(pane, i);
         if (scrollableTabLayoutEnabled() && rect != null
-                && dropTargetIndex >= 0 && i == dropTargetIndex) {
+            && dropTargetIndex >= 0 && i == dropTargetIndex) {
             int tabPlacement = pane.getTabPlacement();
             if (tabPlacement == TOP || tabPlacement == BOTTOM) {
                 if (pane.getComponentOrientation().isLeftToRight()) {

core/src/main/java/com/github/weisj/darklaf/ui/tabbedpane/DarkTabbedPaneUIBridge.java

@@ -25,6 +25,7 @@ package com.github.weisj.darklaf.ui.tabbedpane;
 
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.LazyActionMap;
+import com.github.weisj.darklaf.util.PropertyKey;
 import sun.swing.DefaultLookup;
 import sun.swing.SwingUtilities2;
 import sun.swing.UIAction;
@@ -659,7 +660,7 @@ public abstract class DarkTabbedPaneUIBridge extends TabbedPaneUI implements Swi
 
         View v = getTextViewForTab(tabIndex);
         if (v != null) {
-            tabPane.putClientProperty("html", v);
+            tabPane.putClientProperty(PropertyKey.HTML, v);
         }
 
         SwingUtilities.layoutCompoundLabel(tabPane,
@@ -673,7 +674,7 @@ public abstract class DarkTabbedPaneUIBridge extends TabbedPaneUI implements Swi
                                            textRect,
                                            textIconGap);
 
-        tabPane.putClientProperty("html", null);
+        tabPane.putClientProperty(PropertyKey.HTML, null);
 
         int xNudge = getTabLabelShiftX(tabPlacement, tabIndex, isSelected);
         int yNudge = getTabLabelShiftY(tabPlacement, tabIndex, isSelected);
@@ -908,7 +909,7 @@ public abstract class DarkTabbedPaneUIBridge extends TabbedPaneUI implements Swi
         if (opaque == null) {
             opaque = Boolean.FALSE;
         }
-        LookAndFeel.installProperty(tabPane, "opaque", opaque);
+        LookAndFeel.installProperty(tabPane, PropertyKey.OPAQUE, opaque);
 
         // Fix for 6711145 BasicTabbedPanuUI should not throw a NPE if these
         // keys are missing. So we are setting them to there default values here

core/src/main/java/com/github/weisj/darklaf/ui/tabbedpane/TabbedPaneHandler.java

@@ -24,6 +24,7 @@
 package com.github.weisj.darklaf.ui.tabbedpane;
 
 import com.github.weisj.darklaf.util.DarkSwingUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import javax.swing.event.ChangeEvent;
@@ -32,13 +33,7 @@ import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicHTML;
 import javax.swing.text.View;
 import java.awt.*;
-import java.awt.event.ContainerEvent;
-import java.awt.event.ContainerListener;
-import java.awt.event.FocusEvent;
-import java.awt.event.FocusListener;
-import java.awt.event.MouseEvent;
-import java.awt.event.MouseListener;
-import java.awt.event.MouseMotionListener;
+import java.awt.event.*;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.util.Objects;
@@ -78,11 +73,11 @@ public class TabbedPaneHandler implements ChangeListener, ContainerListener, Foc
                 ui.tabScroller.createButtons(ui);
             }
             ui.calculatedBaseline = false;
-        } else if (Objects.equals(name, "opaque") && isScrollLayout) {
+        } else if (Objects.equals(name, PropertyKey.OPAQUE) && isScrollLayout) {
             boolean newVal = (Boolean) e.getNewValue();
             ui.tabScroller.tabPanel.setOpaque(newVal);
             ui.tabScroller.viewport.setOpaque(newVal);
-        } else if (Objects.equals(name, "background") && isScrollLayout) {
+        } else if (Objects.equals(name, PropertyKey.BACKGROUND) && isScrollLayout) {
             Color newVal = (Color) e.getNewValue();
             ui.tabScroller.tabPanel.setBackground(newVal);
             ui.tabScroller.viewport.setBackground(newVal);
@@ -91,7 +86,7 @@ public class TabbedPaneHandler implements ChangeListener, ContainerListener, Foc
                 ui.tabContainer.removeUnusedTabComponents();
             }
             Component c = ui.tabPane.getTabComponentAt(
-                    (Integer) e.getNewValue());
+                (Integer) e.getNewValue());
             if (c != null) {
                 if (ui.tabContainer == null) {
                     ui.installTabContainer();
@@ -105,7 +100,7 @@ public class TabbedPaneHandler implements ChangeListener, ContainerListener, Foc
         } else if (Objects.equals(name, "indexForNullComponent")) {
             ui.isRunsDirty = true;
             updateHtmlViews((Integer) e.getNewValue(), true);
-        } else if (Objects.equals(name, "font") || DarkSwingUtil.isScaleChanged(e)) {
+        } else if (Objects.equals(name, PropertyKey.FONT) || DarkSwingUtil.isScaleChanged(e)) {
             ui.calculatedBaseline = false;
         }
     }
@@ -270,8 +265,7 @@ public class TabbedPaneHandler implements ChangeListener, ContainerListener, Foc
         // currently no IndexPropertyChangeEvent.  Once
         // IndexPropertyChangeEvents have been added this code should be
         // modified to use it.
-        Integer indexObj =
-                (Integer) tp.getClientProperty("__index_to_remove__");
+        Integer indexObj = (Integer) tp.getClientProperty("__index_to_remove__");
         if (indexObj != null) {
             int index = indexObj;
             if (ui.htmlViews != null && ui.htmlViews.size() > index) {

core/src/main/java/com/github/weisj/darklaf/ui/tabframe/DarkPanelPopupUI.java

@@ -26,6 +26,7 @@ package com.github.weisj.darklaf.ui.tabframe;
 import com.github.weisj.darklaf.components.border.MutableLineBorder;
 import com.github.weisj.darklaf.components.tabframe.JTabFrame;
 import com.github.weisj.darklaf.components.tabframe.PanelPopup;
+import com.github.weisj.darklaf.components.tabframe.TabFramePopup;
 import com.github.weisj.darklaf.components.tooltip.ToolTipContext;
 import com.github.weisj.darklaf.components.uiresource.JLabelUIResource;
 import com.github.weisj.darklaf.ui.panel.DarkPanelUI;
@@ -229,29 +230,29 @@ public class DarkPanelPopupUI extends DarkPanelUI implements PropertyChangeListe
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
         String key = evt.getPropertyName();
-        if ("open".equals(key)) {
+        if (TabFramePopup.KEY_OPEN.equals(key)) {
             if (Boolean.TRUE.equals(evt.getNewValue())) {
                 setHeaderBackground(true);
             }
-        } else if ("content".equals(key)) {
+        } else if (TabFramePopup.KEY_CONTENT.equals(key)) {
             if (content == null) return;
             content.add((Component) evt.getNewValue(), BorderLayout.CENTER);
             content.invalidate();
-        } else if ("title".equals(key)) {
+        } else if (TabFramePopup.KEY_TITLE.equals(key)) {
             if (label == null) return;
             label.setText(evt.getNewValue().toString());
             label.repaint();
-        } else if ("icon".equals(key)) {
+        } else if (TabFramePopup.KEY_ICON.equals(key)) {
             if (label == null) return;
             label.setIcon((Icon) evt.getNewValue());
             label.repaint();
-        } else if ("visibleTab".equals(key)) {
+        } else if (TabFramePopup.KEY_VISIBLE_TAB.equals(key)) {
             if (evt.getNewValue() instanceof JTabFrame.TabFramePosition) {
                 if (((JTabFrame.TabFramePosition) evt.getNewValue()).getAlignment() == popupComponent.getAlignment()) {
                     updateBorder(true);
                 }
             }
-        } else if ("tabFrame".equals(key)) {
+        } else if (TabFramePopup.KEY_TAB_FRAME_PARENT.equals(key)) {
             Object oldVal = evt.getOldValue();
             Object newVal = evt.getNewValue();
             if (oldVal instanceof JTabFrame) {
@@ -260,10 +261,10 @@ public class DarkPanelPopupUI extends DarkPanelUI implements PropertyChangeListe
             if (newVal instanceof JTabFrame) {
                 ((JTabFrame) newVal).addPropertyChangeListener(this);
             }
-        } else if ("peerInsets".equals(key)) {
+        } else if (TabFramePopup.KEY_PEER_INSETS.equals(key)) {
             updateBorder(false);
             updateTooltip();
-        } else if ("alignment".equals(key)) {
+        } else if (TabFramePopup.KEY_ALIGNMENT.equals(key)) {
             updateTooltip();
         }
     }
@@ -281,7 +282,7 @@ public class DarkPanelPopupUI extends DarkPanelUI implements PropertyChangeListe
             if (notifyPeer) {
                 try {
                     Component peer = tabFrame.getPopupComponentAt(tabFrame.getPeer(popupComponent.getAlignment()));
-                    peer.firePropertyChange("peerInsets", 0, 1);
+                    peer.firePropertyChange(TabFramePopup.KEY_PEER_INSETS, 0, 1);
                 } catch (IndexOutOfBoundsException ignored) {/*may happen during transfer*/}
             }
         }

core/src/main/java/com/github/weisj/darklaf/ui/tabframe/DarkTabFrameComponentPopupMenu.java

@@ -27,6 +27,7 @@ import com.github.weisj.darklaf.components.JXPopupMenu;
 import com.github.weisj.darklaf.components.tabframe.TabFrameTab;
 import com.github.weisj.darklaf.icons.EmptyIcon;
 import com.github.weisj.darklaf.util.Alignment;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import javax.swing.plaf.UIResource;
@@ -135,7 +136,7 @@ public class DarkTabFrameComponentPopupMenu extends JXPopupMenu implements Prope
 
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
-        if ("orientation".equals(evt.getPropertyName())) {
+        if (TabFrameTab.KEY_ORIENTATION.equals(evt.getPropertyName())) {
             Object a = evt.getNewValue();
             if (a instanceof Alignment) {
                 if (disabled >= 0) {
@@ -144,7 +145,7 @@ public class DarkTabFrameComponentPopupMenu extends JXPopupMenu implements Prope
                 disabled = ((Alignment) a).ordinal();
                 actions[disabled].setEnabled(false);
             }
-        } else if ("componentPopupMenu".equals(evt.getPropertyName())) {
+        } else if (PropertyKey.COMPONENT_POPUP_MENU.equals(evt.getPropertyName())) {
             if (evt.getNewValue() != this) {
                 tab.getComponent().removePropertyChangeListener(this);
             }

core/src/main/java/com/github/weisj/darklaf/ui/tabframe/DarkTabFrameTabContainerUI.java

@@ -24,11 +24,13 @@
 package com.github.weisj.darklaf.ui.tabframe;
 
 import com.github.weisj.darklaf.components.tabframe.JTabFrame;
+import com.github.weisj.darklaf.components.tabframe.TabFrameTab;
 import com.github.weisj.darklaf.components.tabframe.TabFrameTabContainer;
 import com.github.weisj.darklaf.decorators.HoverListener;
 import com.github.weisj.darklaf.ui.panel.DarkPanelUI;
 import com.github.weisj.darklaf.util.Alignment;
 import com.github.weisj.darklaf.util.DarkUIUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import javax.swing.plaf.ComponentUI;
@@ -42,6 +44,7 @@ import java.beans.PropertyChangeListener;
 
 public class DarkTabFrameTabContainerUI extends DarkPanelUI implements PropertyChangeListener {
 
+    private static final String ACCELERATOR_PREFIX = "accelerator_";
     protected TabFrameTabContainer tabContainer;
     private final MouseListener mouseListener = new MouseAdapter() {
         @Override
@@ -95,8 +98,8 @@ public class DarkTabFrameTabContainerUI extends DarkPanelUI implements PropertyC
         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));
+                     ACCELERATOR_PREFIX + acc);
+        tabFrame.getActionMap().put(ACCELERATOR_PREFIX + acc, createAcceleratorAction(tabFrame));
     }
 
     protected Action createAcceleratorAction(final JTabFrame tabFrame) {
@@ -147,7 +150,7 @@ public class DarkTabFrameTabContainerUI extends DarkPanelUI implements PropertyC
     protected void uninstallAccelerator(final JTabFrame tabFrame) {
         if (tabFrame == null) return;
         int acc = tabContainer.getAccelerator();
-        String accAction = "accelerator_" + acc;
+        String accAction = ACCELERATOR_PREFIX + acc;
         tabFrame.getActionMap().remove(accAction);
     }
 
@@ -161,7 +164,7 @@ public class DarkTabFrameTabContainerUI extends DarkPanelUI implements PropertyC
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
         String key = evt.getPropertyName();
-        if ("content".equals(key)) {
+        if (TabFrameTab.KEY_CONTENT.equals(key)) {
             Object oldVal = evt.getOldValue();
             Object newVal = evt.getNewValue();
             if (oldVal instanceof Component) {
@@ -176,21 +179,21 @@ public class DarkTabFrameTabContainerUI extends DarkPanelUI implements PropertyC
                 ((Component) newVal).addMouseListener(dragListener);
                 ((Component) newVal).addMouseMotionListener(dragListener);
             }
-        } else if ("selected".equals(key)) {
+        } else if (TabFrameTab.KEY_SELECTED.equals(key)) {
             if (tabContainer == null) return;
             tabContainer.repaint();
-        } else if ("accelerator".equals(key)) {
+        } else if (TabFrameTab.KEY_ACCELERATOR.equals(key)) {
             if (tabContainer == null) return;
             uninstallAccelerator(tabContainer.getTabFrame());
             installAccelerator(tabContainer.getTabFrame());
-        } else if ("tabFrame".equals(key)) {
+        } else if (TabFrameTab.KEY_TAB_FRAME_PARENT.equals(key)) {
             if (evt.getOldValue() instanceof JTabFrame) {
                 uninstallAccelerator((JTabFrame) evt.getOldValue());
             }
             if (evt.getNewValue() instanceof JTabFrame) {
                 installAccelerator((JTabFrame) evt.getNewValue());
             }
-        } else if ("paintingForPrint".equals(key)) {
+        } else if (PropertyKey.PAINTING_FOR_PRINT.equals(key)) {
             printing = Boolean.TRUE.equals(evt.getNewValue());
         }
     }

core/src/main/java/com/github/weisj/darklaf/ui/tabframe/DarkTabFrameTabLabelUI.java

@@ -24,12 +24,14 @@
 package com.github.weisj.darklaf.ui.tabframe;
 
 import com.github.weisj.darklaf.components.tabframe.JTabFrame;
+import com.github.weisj.darklaf.components.tabframe.TabFrameTab;
 import com.github.weisj.darklaf.components.tabframe.TabFrameTabLabel;
 import com.github.weisj.darklaf.decorators.HoverListener;
 import com.github.weisj.darklaf.icons.RotatableIcon;
 import com.github.weisj.darklaf.ui.label.DarkLabelUI;
 import com.github.weisj.darklaf.util.Alignment;
 import com.github.weisj.darklaf.util.DarkUIUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 import sun.swing.SwingUtilities2;
 
 import javax.swing.*;
@@ -47,6 +49,7 @@ import java.beans.PropertyChangeListener;
 
 public class DarkTabFrameTabLabelUI extends DarkLabelUI implements PropertyChangeListener {
 
+    private static final String ACCELERATOR_PREFIX = "accelerator_";
     private TabFrameTabLabel tabComponent;
     private final MouseListener mouseListener = new MouseAdapter() {
         @Override
@@ -165,27 +168,27 @@ public class DarkTabFrameTabLabelUI extends DarkLabelUI implements PropertyChang
     public void propertyChange(final PropertyChangeEvent e) {
         super.propertyChange(e);
         String key = e.getPropertyName();
-        if ("selected".equals(key)) {
+        if (TabFrameTab.KEY_SELECTED.equals(key)) {
             tabComponent.setForeground(Boolean.TRUE.equals(e.getNewValue())
                                        ? selectedFontColor : defaultFontColor);
             tabComponent.repaint();
-        } else if ("title".equals(key)) {
+        } else if (TabFrameTab.KEY_TITLE.equals(key)) {
             updateText();
-        } else if ("accelerator".equals(key)) {
+        } else if (TabFrameTab.KEY_ACCELERATOR.equals(key)) {
             updateText();
             if (tabComponent == null) return;
             uninstallAccelerator(tabComponent.getTabFrame());
             installAccelerator(tabComponent.getTabFrame());
-        } else if ("orientation".equals(key)) {
+        } else if (TabFrameTab.KEY_ORIENTATION.equals(key)) {
             rotatableIcon.setOrientation(mapOrientation(tabComponent.getOrientation()));
-        } else if ("tabFrame".equals(key)) {
+        } else if (TabFrameTab.KEY_TAB_FRAME_PARENT.equals(key)) {
             if (e.getOldValue() instanceof JTabFrame) {
                 uninstallAccelerator((JTabFrame) e.getOldValue());
             }
             if (e.getNewValue() instanceof JTabFrame) {
                 installAccelerator((JTabFrame) e.getNewValue());
             }
-        } else if ("paintingForPrint".equals(key)) {
+        } else if (PropertyKey.PAINTING_FOR_PRINT.equals(key)) {
             printing = Boolean.TRUE.equals(e.getNewValue());
         }
     }
@@ -209,8 +212,8 @@ public class DarkTabFrameTabLabelUI extends DarkLabelUI implements PropertyChang
         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));
+                     ACCELERATOR_PREFIX + acc);
+        tabFrame.getActionMap().put(ACCELERATOR_PREFIX + acc, createAcceleratorAction(tabFrame));
     }
 
     protected Action createAcceleratorAction(final JTabFrame tabFrame) {
@@ -236,7 +239,7 @@ public class DarkTabFrameTabLabelUI extends DarkLabelUI implements PropertyChang
     protected void uninstallAccelerator(final JTabFrame tabFrame) {
         if (tabFrame == null) return;
         int acc = tabComponent.getAccelerator();
-        String accAction = "accelerator_" + acc;
+        String accAction = ACCELERATOR_PREFIX + acc;
         tabFrame.getActionMap().remove(accAction);
     }
 

core/src/main/java/com/github/weisj/darklaf/ui/table/DarkTableCellEditor.java

@@ -24,6 +24,9 @@
 package com.github.weisj.darklaf.ui.table;
 
 import com.github.weisj.darklaf.ui.combobox.DarkComboBoxUI;
+import com.github.weisj.darklaf.ui.spinner.DarkSpinnerUI;
+import com.github.weisj.darklaf.ui.text.DarkTextUI;
+import com.github.weisj.darklaf.util.PropertyValue;
 
 import javax.swing.*;
 import javax.swing.border.Border;
@@ -61,8 +64,8 @@ public class DarkTableCellEditor extends DefaultCellEditor {
 
     public DarkTableCellEditor(final JTextField textField) {
         super(textField);
-        textField.setBorder(new TextFieldTableCellEditorBorder());
-        textField.putClientProperty("JTextField.isCellEditor", Boolean.TRUE);
+        textField.setBorder(new TextTableCellEditorBorder());
+        textField.putClientProperty(DarkTextUI.KEY_IS_TABLE_EDITOR, Boolean.TRUE);
         setClickCountToStart(2);
     }
 
@@ -140,7 +143,7 @@ public class DarkTableCellEditor extends DefaultCellEditor {
                 if (value instanceof Boolean) {
                     selected = (Boolean) value;
                 } else if (value instanceof String) {
-                    selected = value.equals("true");
+                    selected = value.equals(PropertyValue.TRUE);
                 }
                 toggleButton.setSelected(selected);
             }
@@ -232,15 +235,15 @@ public class DarkTableCellEditor extends DefaultCellEditor {
             Component rendererComp = table.getCellRenderer(row, column)
                                           .getTableCellRendererComponent(table, value, isSelected, false, row, column);
             if (rendererComp instanceof JTextField) {
-                editorComponent.putClientProperty("JSpinner.cellEditorAlignment",
+                editorComponent.putClientProperty(DarkSpinnerUI.KEY_EDITOR_ALIGNMENT,
                                                   ((JTextField) rendererComp).getHorizontalAlignment());
             } else if (rendererComp instanceof JLabel) {
-                editorComponent.putClientProperty("JSpinner.cellEditorAlignment",
+                editorComponent.putClientProperty(DarkSpinnerUI.KEY_EDITOR_ALIGNMENT,
                                                   ((JLabel) rendererComp).getHorizontalAlignment());
             }
         }
 
-        boolean alternativeRow = Boolean.TRUE.equals(table.getClientProperty("JTable.alternateRowColor"));
+        boolean alternativeRow = Boolean.TRUE.equals(table.getClientProperty(DarkTableUI.KEY_ALTERNATE_ROW_COLOR));
         Color alternativeRowColor = UIManager.getColor("Table.alternateRowBackground");
         Color normalColor = table.getBackground();
         Color background = alternativeRow && row % 2 == 1 ? alternativeRowColor : normalColor;
@@ -270,7 +273,7 @@ public class DarkTableCellEditor extends DefaultCellEditor {
     }
 
     protected TableCellEditor getBooleanEditor(final JTable table) {
-        if ("radioButton".equals(table.getClientProperty("JTable.booleanRenderType"))) {
+        if (DarkTableUI.RENDER_TYPE_RADIOBUTTON.equals(table.getClientProperty(DarkTableUI.KEY_BOOLEAN_RENDER_TYPE))) {
             return radioButtonEditor;
         }
         return checkBoxEditor;

core/src/main/java/com/github/weisj/darklaf/ui/table/DarkTableCellEditorToggleButton.java

@@ -55,7 +55,7 @@ public class DarkTableCellEditorToggleButton extends AbstractCellEditor implemen
         }
         toggleButton.setHorizontalAlignment(table.getComponentOrientation().isLeftToRight() ? LEFT : RIGHT);
 
-        boolean alternativeRow = Boolean.TRUE.equals(table.getClientProperty("JTable.alternateRowColor"));
+        boolean alternativeRow = Boolean.TRUE.equals(table.getClientProperty(DarkTableUI.KEY_ALTERNATE_ROW_COLOR));
         Color alternativeRowColor = UIManager.getColor("Table.alternateRowBackground");
         Color normalColor = table.getBackground();
         Color background = alternativeRow && row % 2 == 1 ? alternativeRowColor : normalColor;

core/src/main/java/com/github/weisj/darklaf/ui/table/DarkTableCellFocusBorder.java

@@ -64,16 +64,16 @@ public class DarkTableCellFocusBorder extends DarkCellBorder {
 
     protected static boolean isRowFocusBorder(final Component c) {
         return c instanceof JComponent
-                && Boolean.TRUE.equals(((JComponent) c).getClientProperty("JTable.rowFocusBorder"));
+            && Boolean.TRUE.equals(((JComponent) c).getClientProperty(DarkTableUI.KEY_SHOW_ROW_FOCUS_BORDER));
     }
 
     protected static boolean forcePaintLeft(final Component c) {
         return c instanceof JComponent
-                && Boolean.TRUE.equals(((JComponent) c).getClientProperty("JTable.forcePaintLeft"));
+            && Boolean.TRUE.equals(((JComponent) c).getClientProperty(DarkTableUI.KEY_FORCE_LEFT_BORDER));
     }
 
     protected static boolean forcePaintRight(final Component c) {
         return c instanceof JComponent
-                && Boolean.TRUE.equals(((JComponent) c).getClientProperty("JTable.forcePaintRight"));
+            && Boolean.TRUE.equals(((JComponent) c).getClientProperty(DarkTableUI.KEY_FORCE_RIGHT_BORDER));
     }
 }

core/src/main/java/com/github/weisj/darklaf/ui/table/DarkTableCellRenderer.java

@@ -41,9 +41,13 @@ import java.awt.*;
 public class DarkTableCellRenderer extends DefaultTableCellRenderer {
 
     private final DarkCellRendererToggleButton<DarkCellRendererToggleButton.CellEditorCheckBox> checkBoxRenderer =
-            new DarkCellRendererToggleButton<>(new DarkCellRendererToggleButton.CellEditorCheckBox(true));
+        new DarkCellRendererToggleButton<>(new DarkCellRendererToggleButton.CellEditorCheckBox(true));
     private final DarkCellRendererToggleButton<DarkCellRendererToggleButton.CellEditorRadioButton> radioRenderer =
-            new DarkCellRendererToggleButton<>(new DarkCellRendererToggleButton.CellEditorRadioButton(true));
+        new DarkCellRendererToggleButton<>(new DarkCellRendererToggleButton.CellEditorRadioButton(true));
+
+    protected static boolean isBooleanRenderingEnabled(final JTable table) {
+        return Boolean.TRUE.equals(table.getClientProperty(DarkTableUI.KEY_RENDER_BOOLEAN_AS_CHECKBOX));
+    }
 
     @Override
     public Component getTableCellRendererComponent(final JTable table, final Object value,
@@ -64,7 +68,7 @@ public class DarkTableCellRenderer extends DefaultTableCellRenderer {
                 && !table.isEditing()
                 && DarkUIUtil.hasFocus(table)) {
             component.setBorder(UIManager.getBorder("Table.focusSelectedCellHighlightBorder"));
-            component.putClientProperty("JTable.rowFocusBorder", true);
+            component.putClientProperty(DarkTableUI.KEY_SHOW_ROW_FOCUS_BORDER, true);
             JTableHeader header = table.getTableHeader();
             TableColumn draggedColumn = (header == null) ? null : header.getDraggedColumn();
             boolean forceLeft = false;
@@ -74,13 +78,13 @@ public class DarkTableCellRenderer extends DefaultTableCellRenderer {
                 forceLeft = column == index + 1 || column == index;
                 forceRight = column == index - 1 || column == index;
             }
-            component.putClientProperty("JTable.forcePaintRight", forceRight);
-            component.putClientProperty("JTable.forcePaintLeft", forceLeft);
+            component.putClientProperty(DarkTableUI.KEY_FORCE_RIGHT_BORDER, forceRight);
+            component.putClientProperty(DarkTableUI.KEY_FORCE_LEFT_BORDER, forceLeft);
         } else {
-            component.putClientProperty("JTable.rowFocusBorder", false);
+            component.putClientProperty(DarkTableUI.KEY_SHOW_ROW_FOCUS_BORDER, false);
         }
 
-        boolean alternativeRow = Boolean.TRUE.equals(table.getClientProperty("JTable.alternateRowColor"));
+        boolean alternativeRow = Boolean.TRUE.equals(table.getClientProperty(DarkTableUI.KEY_ALTERNATE_ROW_COLOR));
         Color alternativeRowColor = UIManager.getColor("Table.alternateRowBackground");
         Color normalColor = table.getBackground();
         Color background = alternativeRow && row % 2 == 1 ? alternativeRowColor : normalColor;
@@ -98,12 +102,8 @@ public class DarkTableCellRenderer extends DefaultTableCellRenderer {
         return component;
     }
 
-    protected static boolean isBooleanRenderingEnabled(final JTable table) {
-        return Boolean.TRUE.equals(table.getClientProperty("JTable.renderBooleanAsCheckBox"));
-    }
-
     protected TableCellRenderer getBooleanRenderer(final JTable table) {
-        if ("radioButton".equals(table.getClientProperty("JTable.booleanRenderType"))) {
+        if (DarkTableUI.RENDER_TYPE_RADIOBUTTON.equals(table.getClientProperty(DarkTableUI.KEY_BOOLEAN_RENDER_TYPE))) {
             return radioRenderer;
         }
         return checkBoxRenderer;

core/src/main/java/com/github/weisj/darklaf/ui/table/DarkTableHeaderUIBridge.java

@@ -24,6 +24,7 @@
 package com.github.weisj.darklaf.ui.table;
 
 import com.github.weisj.darklaf.util.DarkUIUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 import sun.swing.SwingUtilities2;
 import sun.swing.UIAction;
 
@@ -357,7 +358,7 @@ public class DarkTableHeaderUIBridge extends BasicTableHeaderUI {
     protected void installDefaults() {
         LookAndFeel.installColorsAndFont(header, "TableHeader.background",
                                          "TableHeader.foreground", "TableHeader.font");
-        LookAndFeel.installProperty(header, "opaque", Boolean.TRUE);
+        LookAndFeel.installProperty(header, PropertyKey.OPAQUE, Boolean.TRUE);
     }
 
 

core/src/main/java/com/github/weisj/darklaf/ui/table/DarkTableUI.java

@@ -25,6 +25,7 @@ package com.github.weisj.darklaf.ui.table;
 
 import com.github.weisj.darklaf.components.OverlayScrollPane;
 import com.github.weisj.darklaf.util.DarkUIUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 import sun.swing.SwingUtilities2;
 
 import javax.swing.*;
@@ -47,16 +48,32 @@ import java.util.function.Supplier;
  */
 public class DarkTableUI extends DarkTableUIBridge {
 
-    private static final int ROW_HEIGHT = 22;
+    public static final String KEY_PREFIX = "JTable.";
+    public static final String KEY_ALTERNATE_ROW_COLOR = KEY_PREFIX + "alternateRowColor";
+    public static final String KEY_RENDER_BOOLEAN_AS_CHECKBOX = KEY_PREFIX + "renderBooleanAsCheckBox";
+    public static final String KEY_BOOLEAN_RENDER_TYPE = KEY_PREFIX + "booleanRenderType";
+    public static final String KEY_SHOW_ROW_FOCUS_BORDER = KEY_PREFIX + "rowFocusBorder";
+    public static final String KEY_FORCE_LEFT_BORDER = KEY_PREFIX + "forcePaintLeft";
+    public static final String KEY_FORCE_RIGHT_BORDER = KEY_PREFIX + "forcePaintRight";
+    public static final String KEY_FILE_CHOOSER_PARENT = KEY_PREFIX + "fileChooserParent";
+    public static final String KEY_FILENAME_COLUMN_INDEX = KEY_PREFIX + "fileNameColumnIndex";
+    public static final String KEY_HORIZONTAL_LINES = "showHorizontalLines";
+    public static final String KEY_VERTICAL_LINES = "showVerticalLines";
+    public static final String KEY_IS_FILE_LIST = "Table.isFileList";
+    public static final String KEY_IS_PRINT_MODE = "Table.printMode";
+    public static final String RENDER_TYPE_CHECKBOX = "checkBox";
+    public static final String RENDER_TYPE_RADIOBUTTON = "radioButton";
+
+    private static final int ROW_HEIGHT_FALLBACK = 22;
     private final PropertyChangeListener propertyChangeListener = e -> {
         String key = e.getPropertyName();
-        if ("showHorizontalLines".equals(key)) {
+        if (KEY_HORIZONTAL_LINES.equals(key)) {
             boolean b = Boolean.TRUE.equals(e.getNewValue());
             table.setRowMargin(b ? 1 : 0);
-        } else if ("showVerticalLines".equals(key)) {
+        } else if (KEY_VERTICAL_LINES.equals(key)) {
             boolean b = Boolean.TRUE.equals(e.getNewValue());
             table.getColumnModel().setColumnMargin(b ? 1 : 0);
-        } else if ("ancestor".equals(key)) {
+        } else if (PropertyKey.ANCESTOR.equals(key)) {
             Object oldVal = e.getOldValue();
             Object newVal = e.getNewValue();
             if (oldVal instanceof Component) {
@@ -72,7 +89,7 @@ public class DarkTableUI extends DarkTableUIBridge {
                     LookAndFeel.installBorder((JComponent) newUnwrapped, "Table.scrollPaneBorder");
                 }
             }
-        } else if ("componentOrientation".equals(key)) {
+        } else if (PropertyKey.COMPONENT_ORIENTATION.equals(key)) {
             table.doLayout();
             table.repaint();
         }
@@ -181,13 +198,13 @@ public class DarkTableUI extends DarkTableUIBridge {
         super.installDefaults();
         int rowHeight = UIManager.getInt("Table.rowHeight");
         if (rowHeight > 0) {
-            table.setRowHeight(ROW_HEIGHT);
+            table.setRowHeight(ROW_HEIGHT_FALLBACK);
         }
         table.setDefaultEditor(Object.class, new DarkTableCellEditor());
-        table.putClientProperty("JTable.renderBooleanAsCheckBox",
+        table.putClientProperty(KEY_RENDER_BOOLEAN_AS_CHECKBOX,
                                 UIManager.getBoolean("Table.renderBooleanAsCheckBox"));
-        table.putClientProperty("JTable.booleanRenderType", UIManager.getString("Table.booleanRenderType"));
-        table.putClientProperty("JTable.alternateRowColor", UIManager.getBoolean("Table.alternateRowColor"));
+        table.putClientProperty(KEY_BOOLEAN_RENDER_TYPE, UIManager.getString("Table.booleanRenderType"));
+        table.putClientProperty(KEY_ALTERNATE_ROW_COLOR, UIManager.getBoolean("Table.alternateRowColor"));
         setupRendererComponents(table);
         borderColor = UIManager.getColor("TableHeader.borderColor");
         selectionFocusBackground = UIManager.getColor("Table.focusSelectionBackground");
@@ -430,16 +447,16 @@ public class DarkTableUI extends DarkTableUIBridge {
         }
 
         protected JFileChooser getFileChooser() {
-            Object obj = table.getClientProperty("JTable.fileChooserParent");
-            if (obj instanceof Supplier) {
-                Object supplied = ((Supplier) obj).get();
+            Object obj = table.getClientProperty(DarkTableUI.KEY_FILE_CHOOSER_PARENT);
+            if (obj instanceof Supplier<?>) {
+                Object supplied = ((Supplier<?>) obj).get();
                 return supplied instanceof JFileChooser ? (JFileChooser) supplied : null;
             }
             return null;
         }
 
         protected Integer getFileNameColumnIndex() {
-            Object obj = table.getClientProperty("JTable.fileNameColumnIndex");
+            Object obj = table.getClientProperty(DarkTableUI.KEY_FILENAME_COLUMN_INDEX);
             return obj instanceof Integer ? (Integer) obj : 0;
         }
 

core/src/main/java/com/github/weisj/darklaf/ui/table/DarkTableUIBridge.java

@@ -93,10 +93,10 @@ public class DarkTableUIBridge extends TableUIBridge {
         // For FIT_WIDTH, all columns should be printed irrespective of
         // how many columns are visible. So, we used clip which is already set to
         // total col width instead of visible region
-        // Since JTable.PrintMode is not accessible
-        // from here, we aet "Table.printMode" in TablePrintable#print and
+        // Since JDarkTableUI.KEY_IS_PRINT_MODE is not accessible
+        // from here, we aet DarkTableUI.KEY_IS_PRINT_MODE in TablePrintable#print and
         // access from here.
-        Object printMode = table.getClientProperty("Table.printMode");
+        Object printMode = table.getClientProperty(DarkTableUI.KEY_IS_PRINT_MODE);
         if ((printMode == JTable.PrintMode.FIT_WIDTH)) {
             upperLeft = clip.getLocation();
             lowerRight = new Point(clip.x + clip.width - 1,

core/src/main/java/com/github/weisj/darklaf/ui/table/TableUIBridge.java

@@ -27,6 +27,7 @@ import com.github.weisj.darklaf.ui.BasicTransferable;
 import com.github.weisj.darklaf.ui.DragRecognitionSupport;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.LazyActionMap;
+import com.github.weisj.darklaf.util.PropertyKey;
 import sun.swing.DefaultLookup;
 import sun.swing.SwingUtilities2;
 import sun.swing.UIAction;
@@ -40,21 +41,10 @@ import javax.swing.plaf.TableHeaderUI;
 import javax.swing.plaf.TableUI;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicTableUI;
-import javax.swing.table.DefaultTableCellRenderer;
-import javax.swing.table.JTableHeader;
-import javax.swing.table.TableCellEditor;
-import javax.swing.table.TableCellRenderer;
-import javax.swing.table.TableColumn;
-import javax.swing.table.TableColumnModel;
+import javax.swing.table.*;
 import java.awt.*;
 import java.awt.datatransfer.Transferable;
-import java.awt.event.ActionEvent;
-import java.awt.event.ActionListener;
-import java.awt.event.FocusEvent;
-import java.awt.event.FocusListener;
-import java.awt.event.KeyEvent;
-import java.awt.event.KeyListener;
-import java.awt.event.MouseEvent;
+import java.awt.event.*;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.util.Enumeration;
@@ -109,7 +99,7 @@ public abstract class TableUIBridge extends TableUI {
 //  Helper class for keyboard actions
 //
     /**
-     * Local cache of Table's client property "Table.isFileList"
+     * Local cache of Table's client property DarkTableUI.KEY_IS_FILE_LIST
      */
     protected boolean isFileList = false;
 
@@ -280,7 +270,7 @@ public abstract class TableUIBridge extends TableUI {
     /*
      * Returns true if the given point is outside the preferredSize of the
      * item at the given row of the table.  (Column must be 0).
-     * Returns false if the "Table.isFileList" client property is not set.
+     * Returns false if the DarkTableUI.KEY_IS_FILE_LIST client property is not set.
      */
     protected boolean pointOutsidePrefSize(final int row, final int column, final Point p) {
         if (!isFileList) {
@@ -323,7 +313,7 @@ public abstract class TableUIBridge extends TableUI {
         // developer changes the font, it's there responsability to update
         // the row height.
 
-        LookAndFeel.installProperty(table, "opaque", Boolean.TRUE);
+        LookAndFeel.installProperty(table, PropertyKey.OPAQUE, Boolean.TRUE);
 
         Color sbg = table.getSelectionBackground();
         if (sbg == null || sbg instanceof UIResource) {
@@ -352,7 +342,7 @@ public abstract class TableUIBridge extends TableUI {
             }
         }
 
-        isFileList = Boolean.TRUE.equals(table.getClientProperty("Table.isFileList"));
+        isFileList = Boolean.TRUE.equals(table.getClientProperty(DarkTableUI.KEY_IS_FILE_LIST));
     }
 
     /**
@@ -566,9 +556,9 @@ public abstract class TableUIBridge extends TableUI {
         // how many columns are visible. So, we used clip which is already set to
         // total col width instead of visible region
         // Since JTable.PrintMode is not accessible
-        // from here, we aet "Table.printMode" in TablePrintable#print and
+        // from here, we aet DarkTableUI.KEY_IS_PRINT_MODE in TablePrintable#print and
         // access from here.
-        Object printMode = table.getClientProperty("Table.printMode");
+        Object printMode = table.getClientProperty(DarkTableUI.KEY_IS_PRINT_MODE);
         if ((printMode == JTable.PrintMode.FIT_WIDTH)) {
             upperLeft = clip.getLocation();
             lowerRight = new Point(clip.x + clip.width - 1,
@@ -1881,17 +1871,17 @@ public abstract class TableUIBridge extends TableUI {
             String key = getName();
 
             if (sender instanceof JTable &&
-                    Boolean.TRUE.equals(((JTable) sender).getClientProperty("Table.isFileList"))) {
+                Boolean.TRUE.equals(((JTable) sender).getClientProperty(DarkTableUI.KEY_IS_FILE_LIST))) {
                 if (Objects.equals(key, NEXT_COLUMN) ||
-                        Objects.equals(key, NEXT_COLUMN_CELL) ||
-                        Objects.equals(key, NEXT_COLUMN_EXTEND_SELECTION) ||
-                        Objects.equals(key, NEXT_COLUMN_CHANGE_LEAD) ||
-                        Objects.equals(key, PREVIOUS_COLUMN) ||
-                        Objects.equals(key, PREVIOUS_COLUMN_CELL) ||
-                        Objects.equals(key, PREVIOUS_COLUMN_EXTEND_SELECTION) ||
-                        Objects.equals(key, PREVIOUS_COLUMN_CHANGE_LEAD) ||
-                        Objects.equals(key, SCROLL_LEFT_CHANGE_SELECTION) ||
-                        Objects.equals(key, SCROLL_LEFT_EXTEND_SELECTION) ||
+                    Objects.equals(key, NEXT_COLUMN_CELL) ||
+                    Objects.equals(key, NEXT_COLUMN_EXTEND_SELECTION) ||
+                    Objects.equals(key, NEXT_COLUMN_CHANGE_LEAD) ||
+                    Objects.equals(key, PREVIOUS_COLUMN) ||
+                    Objects.equals(key, PREVIOUS_COLUMN_CELL) ||
+                    Objects.equals(key, PREVIOUS_COLUMN_EXTEND_SELECTION) ||
+                    Objects.equals(key, PREVIOUS_COLUMN_CHANGE_LEAD) ||
+                    Objects.equals(key, SCROLL_LEFT_CHANGE_SELECTION) ||
+                    Objects.equals(key, SCROLL_LEFT_EXTEND_SELECTION) ||
                         Objects.equals(key, SCROLL_RIGHT_CHANGE_SELECTION) ||
                         Objects.equals(key, SCROLL_RIGHT_EXTEND_SELECTION) ||
                         Objects.equals(key, FIRST_COLUMN) ||
@@ -2621,9 +2611,9 @@ public abstract class TableUIBridge extends TableUI {
         public void propertyChange(final PropertyChangeEvent event) {
             String changeName = event.getPropertyName();
 
-            if ("componentOrientation".equals(changeName)) {
+            if (PropertyKey.COMPONENT_ORIENTATION.equals(changeName)) {
                 InputMap inputMap = getInputMap(
-                        JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
+                    JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
 
                 SwingUtilities.replaceUIInputMap(table,
                                                  JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT,
@@ -2638,8 +2628,8 @@ public abstract class TableUIBridge extends TableUI {
                 JTable.DropLocation oldValue = (JTable.DropLocation) event.getOldValue();
                 repaintDropLocation(oldValue);
                 repaintDropLocation(table.getDropLocation());
-            } else if ("Table.isFileList".equals(changeName)) {
-                isFileList = Boolean.TRUE.equals(table.getClientProperty("Table.isFileList"));
+            } else if (DarkTableUI.KEY_IS_FILE_LIST.equals(changeName)) {
+                isFileList = Boolean.TRUE.equals(table.getClientProperty(DarkTableUI.KEY_IS_FILE_LIST));
                 table.revalidate();
                 table.repaint();
                 if (isFileList) {

core/src/main/java/com/github/weisj/darklaf/ui/table/TextTableCellEditorBorder.java

@@ -23,6 +23,7 @@
  */
 package com.github.weisj.darklaf.ui.table;
 
+import com.github.weisj.darklaf.ui.text.DarkTextUI;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 
 import javax.swing.*;
@@ -31,11 +32,11 @@ import java.awt.*;
 /**
  * @author Jannis Weis
  */
-public class TextFieldTableCellEditorBorder extends DarkTableCellBorder {
+public class TextTableCellEditorBorder extends DarkTableCellBorder {
 
     protected Color borderColor;
 
-    public TextFieldTableCellEditorBorder() {
+    public TextTableCellEditorBorder() {
         borderColor = UIManager.getColor("TextField.border.enabled");
     }
 
@@ -68,6 +69,16 @@ public class TextFieldTableCellEditorBorder extends DarkTableCellBorder {
         }
     }
 
+    protected static boolean isListEditor(final Component c) {
+        return c instanceof JComponent
+            && Boolean.TRUE.equals(((JComponent) c).getClientProperty(DarkTextUI.KEY_IS_LIST_RENDER))
+            && c.getParent() instanceof JList;
+    }
+
+    protected static boolean isInWrapper(final Component c) {
+        return c.getParent() instanceof DarkTableCellEditor.IconWrapper;
+    }
+
     @Override
     public Insets getBorderInsets(final Component c) {
         Insets ins = super.getBorderInsets();
@@ -78,7 +89,7 @@ public class TextFieldTableCellEditorBorder extends DarkTableCellBorder {
                 ins.right -= ((DarkTableCellEditor.IconWrapper) c.getParent()).getIconCompGap();
             }
         } else if (isListEditor(c)) {
-            ListCellRenderer renderer = ((JList) c.getParent()).getCellRenderer();
+            ListCellRenderer<?> renderer = ((JList<?>) c.getParent()).getCellRenderer();
             if (renderer instanceof JLabel) {
                 if (parentLTR(c)) {
                     ins.left -= ((JLabel) renderer).getIconTextGap() - 1;
@@ -90,15 +101,4 @@ public class TextFieldTableCellEditorBorder extends DarkTableCellBorder {
         return ins;
     }
 
-    protected static boolean isInWrapper(final Component c) {
-        return c.getParent() instanceof DarkTableCellEditor.IconWrapper;
-    }
-
-
-    protected static boolean isListEditor(final Component c) {
-        return c instanceof JComponent
-                && Boolean.TRUE.equals(((JComponent) c).getClientProperty("JTextField.listCellEditor"))
-                && c.getParent() instanceof JList;
-    }
-
 }

core/src/main/java/com/github/weisj/darklaf/ui/taskpane/DarkTaskPaneUI.java

@@ -38,6 +38,8 @@ import java.awt.*;
 
 public class DarkTaskPaneUI extends MetalTaskPaneUI {
 
+    public static final String KEY_COLLAPSED = "collapsed";
+
     protected boolean isCollapsed;
     protected Color borderColor;
     protected Icon collapsedIcon;
@@ -66,7 +68,8 @@ public class DarkTaskPaneUI extends MetalTaskPaneUI {
     @Override
     protected void installListeners() {
         super.installListeners();
-        group.addPropertyChangeListener(JXCollapsiblePane.ANIMATION_STATE_KEY, e -> isCollapsed = "collapsed".equals(e.getNewValue()));
+        group.addPropertyChangeListener(JXCollapsiblePane.ANIMATION_STATE_KEY,
+                                        e -> isCollapsed = KEY_COLLAPSED.equals(e.getNewValue()));
     }
 
     @Override

core/src/main/java/com/github/weisj/darklaf/ui/text/DarkEditorPaneUI.java

@@ -23,17 +23,13 @@
  */
 package com.github.weisj.darklaf.ui.text;
 
+import com.github.weisj.darklaf.util.PropertyKey;
+
 import javax.swing.*;
 import javax.swing.plaf.ActionMapUIResource;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
-import javax.swing.text.Document;
-import javax.swing.text.EditorKit;
-import javax.swing.text.JTextComponent;
-import javax.swing.text.Style;
-import javax.swing.text.StyleConstants;
-import javax.swing.text.StyleContext;
-import javax.swing.text.StyledDocument;
+import javax.swing.text.*;
 import javax.swing.text.html.HTMLDocument;
 import javax.swing.text.html.StyleSheet;
 import java.awt.*;
@@ -142,8 +138,7 @@ public class DarkEditorPaneUI extends DarkTextUI {
             String cssRule = sun.swing.SwingUtilities2.displayPropertiesToCSS(font, fg);
             styleSheet.addRule(cssRule);
             documentStyleSheet.addStyleSheet(styleSheet);
-            documentStyleSheet.addRule("BASE_SIZE " +
-                                               component.getFont().getSize());
+            documentStyleSheet.addRule("BASE_SIZE " + component.getFont().getSize());
             Style style = ((StyledDocument) document).getStyle(StyleContext.DEFAULT_STYLE);
             if (!font.equals(style.getAttribute(FONT_ATTRIBUTE_KEY))) {
                 style.addAttribute(FONT_ATTRIBUTE_KEY, font);
@@ -313,21 +308,21 @@ public class DarkEditorPaneUI extends DarkTextUI {
                 }
             }
             updateFocusTraversalKeys();
-        } else if ("editable".equals(name)) {
+        } else if (PropertyKey.EDITABLE.equals(name)) {
             updateFocusTraversalKeys();
-        } else if ("foreground".equals(name)
-                || "font".equals(name)
-                || "document".equals(name)
-                || JEditorPane.W3C_LENGTH_UNITS.equals(name)
-                || JEditorPane.HONOR_DISPLAY_PROPERTIES.equals(name)
+        } else if (PropertyKey.FOREGROUND.equals(name)
+            || PropertyKey.FONT.equals(name)
+            || PropertyKey.DOCUMENT.equals(name)
+            || JEditorPane.W3C_LENGTH_UNITS.equals(name)
+            || JEditorPane.HONOR_DISPLAY_PROPERTIES.equals(name)
         ) {
             JComponent c = getComponent();
             updateDisplayProperties(c.getFont(), c.getForeground());
             if (JEditorPane.W3C_LENGTH_UNITS.equals(name)
-                    || JEditorPane.HONOR_DISPLAY_PROPERTIES.equals(name)) {
+                || JEditorPane.HONOR_DISPLAY_PROPERTIES.equals(name)) {
                 modelChanged();
             }
-            if ("foreground".equals(name)) {
+            if (PropertyKey.FOREGROUND.equals(name)) {
                 Object honorDisplayPropertiesObject = c.getClientProperty(JEditorPane.HONOR_DISPLAY_PROPERTIES);
                 boolean honorDisplayProperties = false;
                 if (honorDisplayPropertiesObject instanceof Boolean) {

core/src/main/java/com/github/weisj/darklaf/ui/text/DarkFormattedTextFieldUI.java

@@ -23,6 +23,8 @@
  */
 package com.github.weisj.darklaf.ui.text;
 
+import com.github.weisj.darklaf.util.PropertyKey;
+
 import javax.swing.*;
 import javax.swing.event.DocumentEvent;
 import javax.swing.event.DocumentListener;
@@ -63,7 +65,7 @@ public class DarkFormattedTextFieldUI extends DarkTextFieldUI implements Propert
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
         super.propertyChange(evt);
-        if ("document".equals(evt.getPropertyName())) {
+        if (PropertyKey.DOCUMENT.equals(evt.getPropertyName())) {
             Object oldDoc = evt.getOldValue();
             Object newDoc = evt.getNewValue();
             if (oldDoc instanceof Document) {

core/src/main/java/com/github/weisj/darklaf/ui/text/DarkPasswordFieldUI.java

@@ -42,6 +42,8 @@ import java.util.Arrays;
  */
 public class DarkPasswordFieldUI extends DarkPasswordFieldUIBridge {
 
+    public static final String KEY_PREFIX = "JPasswordField.";
+    public static final String KEY_SHOW_VIEW_BUTTON = "JPasswordField.showViewIcon";
     protected Icon show;
     protected Icon showPressed;
     private final FocusListener focusListener = new FocusAdapter() {
@@ -179,7 +181,7 @@ public class DarkPasswordFieldUI extends DarkPasswordFieldUIBridge {
 
     public static boolean hasShowIcon(final Component c) {
         return c instanceof JPasswordField
-            && Boolean.TRUE.equals(((JComponent) c).getClientProperty("JPasswordField.showViewIcon"));
+            && Boolean.TRUE.equals(((JComponent) c).getClientProperty(KEY_SHOW_VIEW_BUTTON));
     }
 
 
@@ -218,7 +220,7 @@ public class DarkPasswordFieldUI extends DarkPasswordFieldUIBridge {
     public void propertyChange(final PropertyChangeEvent evt) {
         super.propertyChange(evt);
         String key = evt.getPropertyName();
-        if ("JPasswordField.showViewIcon".equals(key)) {
+        if (KEY_SHOW_VIEW_BUTTON.equals(key)) {
             editor.doLayout();
             Component parent = editor.getParent();
             if (parent instanceof JComponent) {

core/src/main/java/com/github/weisj/darklaf/ui/text/DarkTextAreaUI.java

@@ -24,23 +24,12 @@
 package com.github.weisj.darklaf.ui.text;
 
 import com.github.weisj.darklaf.ui.html.DarkHTML;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import javax.swing.event.DocumentEvent;
 import javax.swing.plaf.ComponentUI;
-import javax.swing.text.AbstractDocument;
-import javax.swing.text.BoxView;
-import javax.swing.text.CompositeView;
-import javax.swing.text.Document;
-import javax.swing.text.Element;
-import javax.swing.text.GlyphView;
-import javax.swing.text.JTextComponent;
-import javax.swing.text.ParagraphView;
-import javax.swing.text.PlainView;
-import javax.swing.text.StyleConstants;
-import javax.swing.text.View;
-import javax.swing.text.ViewFactory;
-import javax.swing.text.WrappedPlainView;
+import javax.swing.text.*;
 import java.awt.*;
 import java.beans.PropertyChangeEvent;
 
@@ -68,11 +57,11 @@ public class DarkTextAreaUI extends DarkTextUI {
     public void propertyChange(final PropertyChangeEvent evt) {
         super.propertyChange(evt);
         if (evt.getPropertyName().equals("lineWrap") ||
-                evt.getPropertyName().equals("wrapStyleWord") ||
-                evt.getPropertyName().equals("tabSize")) {
+            evt.getPropertyName().equals("wrapStyleWord") ||
+            evt.getPropertyName().equals("tabSize")) {
             // rebuild the view
             modelChanged();
-        } else if ("editable".equals(evt.getPropertyName())) {
+        } else if (PropertyKey.EDITABLE.equals(evt.getPropertyName())) {
             updateFocusTraversalKeys();
         }
     }

core/src/main/java/com/github/weisj/darklaf/ui/text/DarkTextBorder.java

@@ -23,7 +23,7 @@
  */
 package com.github.weisj.darklaf.ui.text;
 
-import com.github.weisj.darklaf.ui.table.TextFieldTableCellEditorBorder;
+import com.github.weisj.darklaf.ui.table.TextTableCellEditorBorder;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.GraphicsContext;
 import com.github.weisj.darklaf.util.GraphicsUtil;
@@ -40,7 +40,7 @@ import java.awt.*;
  */
 public class DarkTextBorder implements Border, UIResource {
 
-    private static final Border editorBorder = new TextFieldTableCellEditorBorder();
+    private static final Border editorBorder = new TextTableCellEditorBorder();
     protected Color errorBorderColor;
     protected Color focusErrorBorderColor;
     protected Color focusBorderColor;
@@ -73,13 +73,13 @@ public class DarkTextBorder implements Border, UIResource {
 
     protected static boolean hasError(final Component c) {
         return c instanceof JComponent
-            && Boolean.TRUE.equals(((JComponent) c).getClientProperty("JTextComponent.hasError"));
+            && Boolean.TRUE.equals(((JComponent) c).getClientProperty(DarkTextUI.KEY_HAS_ERROR));
     }
 
 
     protected static boolean isCellEditor(final Component c) {
         return c instanceof JComponent
-            && Boolean.TRUE.equals(((JComponent) c).getClientProperty("JTextField.cellEditor"));
+            && Boolean.TRUE.equals(((JComponent) c).getClientProperty(DarkTextUI.KEY_IS_CELL_EDITOR));
     }
 
     protected int getArcSize(final Component c) {

core/src/main/java/com/github/weisj/darklaf/ui/text/DarkTextFieldUI.java

@@ -45,13 +45,18 @@ import java.beans.PropertyChangeListener;
  */
 public class DarkTextFieldUI extends DarkTextFieldUIBridge implements PropertyChangeListener {
 
+    public static final String KEY_PREFIX = "JTextField.";
+    public static final String KEY_VARIANT = KEY_PREFIX + "variant";
+    public static final String KEY_KEEP_SELECTION_ON_FOCUS_LOST = KEY_PREFIX + "keepSelectionOnFocusLost";
+    public static final String KEY_FIND_POPUP = KEY_PREFIX + "Search.FindPopup";
+    public static final String VARIANT_SEARCH = "search";
     protected static Icon clear;
     protected static Icon clearHover;
     protected static Icon search;
     protected static Icon searchWithHistory;
     private final FocusListener focusListener = new FocusAdapter() {
         public void focusLost(final FocusEvent e) {
-            if (!Boolean.TRUE.equals(getComponent().getClientProperty("JTextField.keepSelectionOnFocusLost"))) {
+            if (!Boolean.TRUE.equals(getComponent().getClientProperty(KEY_KEEP_SELECTION_ON_FOCUS_LOST))) {
                 getComponent().select(0, 0);
             }
         }
@@ -149,7 +154,7 @@ public class DarkTextFieldUI extends DarkTextFieldUIBridge implements PropertyCh
 
 
     private static JPopupMenu getSearchPopup(final JComponent c) {
-        Object value = c.getClientProperty("JTextField.Search.FindPopup");
+        Object value = c.getClientProperty(KEY_FIND_POPUP);
         return value instanceof JPopupMenu ? (JPopupMenu) value : null;
     }
 
@@ -170,7 +175,7 @@ public class DarkTextFieldUI extends DarkTextFieldUIBridge implements PropertyCh
 
 
     public static boolean isSearchField(final Component c) {
-        return c instanceof JTextField && "search".equals(((JTextField) c).getClientProperty("JTextField.variant"));
+        return c instanceof JTextField && VARIANT_SEARCH.equals(((JTextField) c).getClientProperty(KEY_VARIANT));
     }
 
     protected void paintBackground(final Graphics graphics) {
@@ -252,7 +257,7 @@ public class DarkTextFieldUI extends DarkTextFieldUIBridge implements PropertyCh
     public void propertyChange(final PropertyChangeEvent evt) {
         super.propertyChange(evt);
         String key = evt.getPropertyName();
-        if ("JTextField.Search.FindPopup".equals(key)) {
+        if (KEY_FIND_POPUP.equals(key)) {
             Object oldVal = evt.getOldValue();
             Object newVal = evt.getNewValue();
             if (oldVal instanceof JPopupMenu) {
@@ -261,7 +266,7 @@ public class DarkTextFieldUI extends DarkTextFieldUIBridge implements PropertyCh
             if (newVal instanceof JPopupMenu) {
                 ((JPopupMenu) newVal).addPopupMenuListener(searchPopupListener);
             }
-        } else if ("JTextField.variant".equals(key)) {
+        } else if (KEY_VARIANT.equals(key)) {
             editor.doLayout();
             Component parent = editor.getParent();
             if (parent instanceof JComponent) {

core/src/main/java/com/github/weisj/darklaf/ui/text/DarkTextUI.java

@@ -49,6 +49,13 @@ import java.util.Set;
  */
 public abstract class DarkTextUI extends BasicTextUI implements PropertyChangeListener {
 
+    public static final String KEY_PREFIX = "JTextComponent.";
+    public static final String KEY_ROUNDED_SELECTION = KEY_PREFIX + "roundedSelection";
+    public static final String KEY_HAS_ERROR = KEY_PREFIX + "hasError";
+    public static final String KEY_IS_CELL_EDITOR = KEY_PREFIX + "cellEditor";
+    public static final String KEY_IS_TABLE_EDITOR = KEY_PREFIX + "isTableCellEditor";
+    public static final String KEY_IS_LIST_RENDER = KEY_PREFIX + "listCellEditor";
+
     protected JTextComponent editor;
     private FocusListener focusListener = new FocusListener() {
         @Override
@@ -75,7 +82,7 @@ public abstract class DarkTextUI extends BasicTextUI implements PropertyChangeLi
     @Override
     protected void installDefaults() {
         super.installDefaults();
-        editor.putClientProperty("JTextComponent.roundedSelection",
+        editor.putClientProperty(KEY_ROUNDED_SELECTION,
                                  UIManager.getBoolean("TextComponent.roundedSelection"));
         disabledColor = UIManager.getColor(getPropertyPrefix() + ".disabledBackground");
         inactiveColor = UIManager.getColor(getPropertyPrefix() + ".inactiveBackground");
@@ -84,15 +91,15 @@ public abstract class DarkTextUI extends BasicTextUI implements PropertyChangeLi
     @Override
     protected void uninstallDefaults() {
         super.uninstallDefaults();
-        editor.putClientProperty("JTextComponent.roundedSelection", null);
+        editor.putClientProperty(KEY_ROUNDED_SELECTION, null);
     }
 
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
         String key = evt.getPropertyName();
-        if ("JTextComponent.roundedSelection".equals(key)) {
+        if (KEY_ROUNDED_SELECTION.equals(key)) {
             editor.repaint();
-        } else if ("JTextComponent.hasError".equals(key)) {
+        } else if (KEY_HAS_ERROR.equals(key)) {
             editor.repaint();
         }
     }

core/src/main/java/com/github/weisj/darklaf/ui/toolbar/DarkToolBarLayout.java

@@ -23,6 +23,8 @@
  */
 package com.github.weisj.darklaf.ui.toolbar;
 
+import com.github.weisj.darklaf.util.PropertyKey;
+
 import javax.swing.*;
 import javax.swing.plaf.UIResource;
 import java.awt.*;
@@ -99,7 +101,7 @@ public class DarkToolBarLayout implements LayoutManager2, Serializable, Property
 
     public void propertyChange(final PropertyChangeEvent e) {
         String name = e.getPropertyName();
-        if (name.equals("orientation")) {
+        if (name.equals(PropertyKey.ORIENTATION)) {
             int o = (Integer) e.getNewValue();
             if (o == JToolBar.VERTICAL) {
                 lm = new BoxLayout(toolBar, BoxLayout.PAGE_AXIS);

core/src/main/java/com/github/weisj/darklaf/ui/toolbar/DarkToolBarUI.java

@@ -38,6 +38,8 @@ import java.awt.event.WindowEvent;
  */
 public class DarkToolBarUI extends DarkToolBarUIBridge {
 
+    public static final String KEY_PREFIX = "JToolBar.";
+    public static final String KEY_USE_TOOL_BAR_BACKGROUND = KEY_PREFIX + "drag.useToolbarBackground";
     private static final Robot robot = createRobot();
 
     private final DropPreviewPanel previewPanel = new DropPreviewPanel();

core/src/main/java/com/github/weisj/darklaf/ui/toolbar/DarkToolBarUIBridge.java

@@ -25,6 +25,7 @@ package com.github.weisj.darklaf.ui.toolbar;
 
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.LazyActionMap;
+import com.github.weisj.darklaf.util.PropertyKey;
 import sun.swing.DefaultLookup;
 import sun.swing.UIAction;
 
@@ -38,15 +39,7 @@ import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicBorders;
 import javax.swing.plaf.basic.BasicToolBarUI;
 import java.awt.*;
-import java.awt.event.ActionEvent;
-import java.awt.event.ContainerEvent;
-import java.awt.event.ContainerListener;
-import java.awt.event.FocusEvent;
-import java.awt.event.FocusListener;
-import java.awt.event.MouseEvent;
-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.HashMap;
@@ -180,7 +173,7 @@ public abstract class DarkToolBarUIBridge extends ToolBarUI implements SwingCons
         floatingToolBar = null;
 
         setOrientation(toolBar.getOrientation());
-        LookAndFeel.installProperty(c, "opaque", Boolean.TRUE);
+        LookAndFeel.installProperty(c, PropertyKey.OPAQUE, Boolean.TRUE);
 
         if (c.getClientProperty(FOCUSED_COMP_INDEX) != null) {
             focusedCompIndex = (Integer) (c.getClientProperty(FOCUSED_COMP_INDEX));
@@ -1044,7 +1037,7 @@ public abstract class DarkToolBarUIBridge extends ToolBarUI implements SwingCons
             String propertyName = evt.getPropertyName();
             if (Objects.equals(propertyName, "lookAndFeel")) {
                 toolBar.updateUI();
-            } else if (Objects.equals(propertyName, "orientation")) {
+            } else if (Objects.equals(propertyName, PropertyKey.ORIENTATION)) {
                 // Search for JSeparator components and change it's orientation
                 // to match the toolbar and flip it's orientation.
                 Component[] components = toolBar.getComponents();

core/src/main/java/com/github/weisj/darklaf/ui/toolbar/DropPreviewPanel.java

@@ -49,7 +49,7 @@ public class DropPreviewPanel extends JComponent {
     }
 
     protected Color getBackgroundColor() {
-        boolean useToolbar = Boolean.TRUE.equals(toolBar.getClientProperty("JToolBar.drag.useToolbarBackground"));
+        boolean useToolbar = Boolean.TRUE.equals(toolBar.getClientProperty(DarkToolBarUI.KEY_USE_TOOL_BAR_BACKGROUND));
         if (!useToolbar) {
             Color c = dropBackground;
             if (c == null) {

core/src/main/java/com/github/weisj/darklaf/ui/tooltip/DarkTooltipBorder.java

@@ -139,7 +139,7 @@ public class DarkTooltipBorder implements Border {
 
     protected Insets getUserInsets(final Component c) {
         if (c instanceof JComponent) {
-            Object obj = ((JComponent) c).getClientProperty("JToolTip.insets");
+            Object obj = ((JComponent) c).getClientProperty(DarkTooltipUI.KEY_INSETS);
             if (obj instanceof Insets) {
                 return (Insets) obj;
             }
@@ -166,8 +166,8 @@ public class DarkTooltipBorder implements Border {
 
     protected boolean isPlain(final Component c) {
         if (!(c instanceof JComponent)) return false;
-        Object prop = ((JComponent) c).getClientProperty("JToolTip.style");
-        return prop == ToolTipStyle.PLAIN || "plain".equals(prop);
+        Object prop = ((JComponent) c).getClientProperty(DarkTooltipUI.KEY_STYLE);
+        return prop == ToolTipStyle.PLAIN || DarkTooltipUI.VARIANT_PLAIN.equals(prop);
     }
 
     public int getShadowSize(final Component c) {

core/src/main/java/com/github/weisj/darklaf/ui/tooltip/DarkTooltipUI.java

@@ -25,6 +25,7 @@ package com.github.weisj.darklaf.ui.tooltip;
 
 import com.github.weisj.darklaf.util.Alignment;
 import com.github.weisj.darklaf.util.DarkUIUtil;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import javax.swing.border.Border;
@@ -42,6 +43,16 @@ import java.beans.PropertyChangeListener;
  */
 public class DarkTooltipUI extends BasicToolTipUI implements PropertyChangeListener, HierarchyListener {
 
+    public static final String KEY_PREFIX = "JToolTip.";
+    public static final String KEY_STYLE = KEY_PREFIX + "style";
+    public static final String KEY_INSETS = KEY_PREFIX + "insets";
+    public static final String KEY_POINTER_LOCATION = KEY_PREFIX + "pointerLocation";
+    public static final String KEY_POINTER_WIDTH = KEY_PREFIX + "pointerWidth";
+    public static final String KEY_POINTER_HEIGHT = KEY_PREFIX + "pointerHeight";
+    public static final String KEY_PLAIN_TOOLTIP = "JComponent.plainTooltip";
+    public static final String VARIANT_PLAIN = "plain";
+    public static final String VARIANT_BALLOON = "balloon";
+
     protected JToolTip toolTip;
     protected MouseListener exitListener = new MouseAdapter() {
         @Override
@@ -84,7 +95,7 @@ public class DarkTooltipUI extends BasicToolTipUI implements PropertyChangeListe
 
 
     public static ComponentUI createUI(final JComponent c) {
-        if (Boolean.TRUE.equals(c.getClientProperty("JComponent.plainTooltip"))) {
+        if (Boolean.TRUE.equals(c.getClientProperty(KEY_PLAIN_TOOLTIP))) {
             return BasicToolTipUI.createUI(c);
         } else {
             return new DarkTooltipUI();
@@ -132,7 +143,7 @@ public class DarkTooltipUI extends BasicToolTipUI implements PropertyChangeListe
         super.installDefaults(c);
         c.setOpaque(false);
         if (c.getBorder() instanceof DarkTooltipBorder) {
-            Alignment align = (Alignment) c.getClientProperty("JToolTip.pointerLocation");
+            Alignment align = (Alignment) c.getClientProperty(KEY_POINTER_LOCATION);
             ((DarkTooltipBorder) c.getBorder()).setPointerLocation(align == null ? Alignment.CENTER : align);
         }
     }
@@ -181,7 +192,7 @@ public class DarkTooltipUI extends BasicToolTipUI implements PropertyChangeListe
         String text = ((JToolTip) c).getTipText();
 
         if ((text != null) && !text.equals("")) {
-            View v = (View) c.getClientProperty("html");
+            View v = (View) c.getClientProperty(PropertyKey.HTML);
             if (v != null) {
                 prefSize.width += (int) v.getPreferredSpan(View.X_AXIS) + 6;
                 prefSize.height += (int) v.getPreferredSpan(View.Y_AXIS);
@@ -223,26 +234,26 @@ public class DarkTooltipUI extends BasicToolTipUI implements PropertyChangeListe
             if (tooltip.getBorder() instanceof DarkTooltipBorder) {
                 DarkTooltipBorder border = (DarkTooltipBorder) tooltip.getBorder();
                 Object newVal = evt.getNewValue();
-                if ("JToolTip.pointerLocation".equals(key)) {
+                if (KEY_POINTER_LOCATION.equals(key)) {
                     if (newVal instanceof Alignment) {
                         border.setPointerLocation((Alignment) newVal);
                     } else {
                         border.setPointerLocation(Alignment.CENTER);
                     }
                     updateSize();
-                } else if ("JToolTip.pointerHeight".equals(key)) {
+                } else if (KEY_POINTER_HEIGHT.equals(key)) {
                     if (newVal instanceof Integer) {
                         border.setPointerHeight((Integer) newVal);
                     }
                     updateSize();
-                } else if ("JToolTip.pointerWidth".equals(key)) {
+                } else if (KEY_POINTER_WIDTH.equals(key)) {
                     if (newVal instanceof Integer) {
                         border.setPointerWidth((Integer) newVal);
                     }
                     updateSize();
-                } else if ("JToolTip.insets".equals(key)) {
+                } else if (KEY_INSETS.equals(key)) {
                     updateSize();
-                } else if ("component".equals(key)) {
+                } else if (PropertyKey.COMPONENT.equals(key)) {
                     Object oldComp = evt.getOldValue();
                     if (oldComp instanceof Component) {
                         ((Component) oldComp).removeMouseListener(mouseListener);
@@ -253,7 +264,7 @@ public class DarkTooltipUI extends BasicToolTipUI implements PropertyChangeListe
                     }
                 }
             }
-            if ("JToolTip.style".equals(key)) {
+            if (KEY_STYLE.equals(key)) {
                 tooltip.setPreferredSize(getPreferredSize(tooltip));
             }
         }

core/src/main/java/com/github/weisj/darklaf/ui/tree/DarkDefaultTreeEditor.java

@@ -83,7 +83,7 @@ public class DarkDefaultTreeEditor extends DefaultTreeCellEditor {
     }
 
     protected DarkTreeCellEditor getBooleanEditor(final JTree table) {
-        if ("radioButton".equals(table.getClientProperty("JTree.booleanRenderType"))) {
+        if (DarkTreeUI.RENDER_TYPE_RADIOBUTTON.equals(table.getClientProperty(DarkTreeUI.KEY_BOOLEAN_RENDER_TYPE))) {
             return radioButtonEditor;
         }
         return checkBoxEditor;

core/src/main/java/com/github/weisj/darklaf/ui/tree/DarkTreeCellEditor.java

@@ -24,6 +24,7 @@
 package com.github.weisj.darklaf.ui.tree;
 
 import com.github.weisj.darklaf.components.SelectableTreeNode;
+import com.github.weisj.darklaf.ui.button.DarkToggleButtonUI;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 
 import javax.swing.*;
@@ -76,7 +77,7 @@ public class DarkTreeCellEditor extends DefaultCellEditor implements TreeCellEdi
             }
         };
         toggleButton.setFocusPainted(false);
-        toggleButton.putClientProperty("JToggleButton.isTreeCellEditor", Boolean.TRUE);
+        toggleButton.putClientProperty(DarkToggleButtonUI.KEY_IS_TREE_EDITOR, Boolean.TRUE);
         toggleButton.addActionListener(delegate);
         toggleButton.setRequestFocusEnabled(false);
         toggleButton.addFocusListener(this);

core/src/main/java/com/github/weisj/darklaf/ui/tree/DarkTreeCellRenderer.java

@@ -25,6 +25,7 @@ package com.github.weisj.darklaf.ui.tree;
 
 import com.github.weisj.darklaf.ui.cell.DarkCellRendererToggleButton;
 import com.github.weisj.darklaf.util.DarkUIUtil;
+import com.github.weisj.darklaf.util.PropertyValue;
 
 import javax.swing.*;
 import javax.swing.tree.DefaultMutableTreeNode;
@@ -72,18 +73,18 @@ public class DarkTreeCellRenderer extends DefaultTreeCellRenderer implements Tre
         }
         if (!(val instanceof Boolean)) {
             String str = String.valueOf(val);
-            if ("true".equals(str)) val = true;
-            if ("false".equals(str)) val = false;
+            if (PropertyValue.TRUE.equals(str)) val = true;
+            if (PropertyValue.FALSE.equals(str)) val = false;
         }
         return val;
     }
 
     protected static boolean isBooleanRenderingEnabled(final JTree tree) {
-        return Boolean.TRUE.equals(tree.getClientProperty("JTree.renderBooleanAsCheckBox"));
+        return Boolean.TRUE.equals(tree.getClientProperty(DarkTreeUI.KEY_RENDER_BOOLEAN_AS_CHECKBOX));
     }
 
     protected DarkCellRendererToggleButton getBooleanRenderer(final JTree table) {
-        if ("radioButton".equals(table.getClientProperty("JTree.booleanRenderType"))) {
+        if (DarkTreeUI.RENDER_TYPE_RADIOBUTTON.equals(table.getClientProperty(DarkTreeUI.KEY_BOOLEAN_RENDER_TYPE))) {
             return radioRenderer;
         }
         return checkBoxRenderer;

core/src/main/java/com/github/weisj/darklaf/ui/tree/DarkTreeUI.java

@@ -23,6 +23,7 @@
  */
 package com.github.weisj.darklaf.ui.tree;
 
+import com.github.weisj.darklaf.ui.button.DarkToggleButtonUI;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.SystemInfo;
 
@@ -46,8 +47,18 @@ import java.util.Enumeration;
  */
 public class DarkTreeUI extends BasicTreeUI implements PropertyChangeListener {
 
-    public static final String TREE_TABLE_TREE_KEY = "JTree.treeTableTree";
-    public static final String STRIPED_CLIENT_PROPERTY = "JTree.alternateRowColor";
+    public static final String KEY_PREFIX = "JTree.";
+    public static final String KEY_TREE_TABLE_TREE = KEY_PREFIX + "treeTableTree";
+    public static final String KEY_ALTERNATE_ROW_COLOR = KEY_PREFIX + "alternateRowColor";
+    public static final String KEY_RENDER_BOOLEAN_AS_CHECKBOX = KEY_PREFIX + "renderBooleanAsCheckBox";
+    public static final String KEY_BOOLEAN_RENDER_TYPE = KEY_PREFIX + "booleanRenderType";
+    public static final String KEY_LINE_STYLE = KEY_PREFIX + "lineStyle";
+    public static final String KEY_MAC_ACTIONS_INSTALLED = "MacTreeUi.actionsInstalled";
+    public static final String RENDER_TYPE_CHECKBOX = "checkBox";
+    public static final String RENDER_TYPE_RADIOBUTTON = "radioButton";
+    public static final String STYLE_LINE = "line";
+    public static final String STYLE_DASHED = "dashed";
+    public static final String STYLE_NONE = "none";
 
     private final MouseListener selectionListener = new MouseAdapter() {
         boolean handled = false;
@@ -132,7 +143,8 @@ public class DarkTreeUI extends BasicTreeUI implements PropertyChangeListener {
         super.completeUIInstall();
         myOldRepaintAllRowValue = UIManager.getBoolean("Tree.repaintWholeRow");
         UIManager.put("Tree.repaintWholeRow", true);
-        tree.putClientProperty("JTree.alternateRowColor", UIManager.getBoolean("Tree.alternateRowColor"));
+        tree.putClientProperty(DarkTreeUI.KEY_ALTERNATE_ROW_COLOR,
+                               UIManager.getBoolean("Tree.alternateRowColor"));
     }
 
     @Override
@@ -152,11 +164,11 @@ public class DarkTreeUI extends BasicTreeUI implements PropertyChangeListener {
         collapsedSelected = UIManager.getIcon("Tree.collapsed.selected.unfocused.icon");
         collapsedFocus = UIManager.getIcon("Tree.collapsed.unselected.focused.icon");
         collapsed = UIManager.getIcon("Tree.collapsed.unselected.unfocused.icon");
-        tree.putClientProperty("JTree.renderBooleanAsCheckBox",
+        tree.putClientProperty(DarkTreeUI.KEY_RENDER_BOOLEAN_AS_CHECKBOX,
                                UIManager.getBoolean("Tree.renderBooleanAsCheckBox"));
-        tree.putClientProperty("JTree.booleanRenderType", UIManager.getString("Tree.booleanRenderType"));
+        tree.putClientProperty(DarkTreeUI.KEY_BOOLEAN_RENDER_TYPE, UIManager.getString("Tree.booleanRenderType"));
         tree.setShowsRootHandles(true);
-        tree.putClientProperty("JTree.lineStyle", "Line");
+        tree.putClientProperty(KEY_LINE_STYLE, UIManager.getString("Tree.defaultLineStyle"));
     }
 
     @Override
@@ -170,9 +182,9 @@ public class DarkTreeUI extends BasicTreeUI implements PropertyChangeListener {
     protected void installKeyboardActions() {
         super.installKeyboardActions();
 
-        if (Boolean.TRUE.equals(tree.getClientProperty("MacTreeUi.actionsInstalled"))) return;
+        if (Boolean.TRUE.equals(tree.getClientProperty(KEY_MAC_ACTIONS_INSTALLED))) return;
 
-        tree.putClientProperty("MacTreeUi.actionsInstalled", Boolean.TRUE);
+        tree.putClientProperty(KEY_MAC_ACTIONS_INSTALLED, Boolean.TRUE);
 
         final InputMap inputMap = tree.getInputMap(JComponent.WHEN_FOCUSED);
         inputMap.put(KeyStroke.getKeyStroke("pressed LEFT"), "collapse_or_move_up");
@@ -320,9 +332,9 @@ public class DarkTreeUI extends BasicTreeUI implements PropertyChangeListener {
         if (!DarkUIUtil.hasFocus(tree)) {
             Component owner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
             boolean treeEditor = owner instanceof JComponent
-                    && Boolean.TRUE.equals(((JComponent) owner).getClientProperty("JToggleButton.isTreeCellEditor"));
+                && Boolean.TRUE.equals(((JComponent) owner).getClientProperty(DarkToggleButtonUI.KEY_IS_TREE_EDITOR));
             boolean treeRenderer = owner instanceof JComponent
-                    && Boolean.TRUE.equals(((JComponent) owner).getClientProperty("JToggleButton.isTreeCellRenderer"));
+                && Boolean.TRUE.equals(((JComponent) owner).getClientProperty(DarkToggleButtonUI.KEY_IS_TREE_RENDER));
             return treeEditor || treeRenderer;
         }
         return true;
@@ -499,10 +511,10 @@ public class DarkTreeUI extends BasicTreeUI implements PropertyChangeListener {
 
     protected Color getRowBackground(final int row, final boolean selected) {
         if (selected) {
-            boolean isTableTree = Boolean.TRUE.equals(tree.getClientProperty(TREE_TABLE_TREE_KEY));
+            boolean isTableTree = Boolean.TRUE.equals(tree.getClientProperty(KEY_TREE_TABLE_TREE));
             return getTreeSelectionBackground(hasFocus() || isTableTree || tree.isEditing());
         }
-        if (Boolean.TRUE.equals(tree.getClientProperty(STRIPED_CLIENT_PROPERTY)) && row % 2 == 1) {
+        if (Boolean.TRUE.equals(tree.getClientProperty(KEY_ALTERNATE_ROW_COLOR)) && row % 2 == 1) {
             return alternativeBackground;
         } else {
             return tree.getBackground();
@@ -510,7 +522,7 @@ public class DarkTreeUI extends BasicTreeUI implements PropertyChangeListener {
     }
 
     protected boolean shouldPaintLines() {
-        return !"None".equals(getLineStyle());
+        return !STYLE_NONE.equals(getLineStyle());
     }
 
     protected Color getLineColor(final TreePath path) {
@@ -545,7 +557,7 @@ public class DarkTreeUI extends BasicTreeUI implements PropertyChangeListener {
     }
 
     protected String getLineStyle() {
-        return String.valueOf(tree.getClientProperty("JTree.lineStyle"));
+        return String.valueOf(tree.getClientProperty(KEY_LINE_STYLE));
     }
 
     protected boolean selectedChildOf(final TreePath path) {
@@ -557,7 +569,7 @@ public class DarkTreeUI extends BasicTreeUI implements PropertyChangeListener {
     }
 
     protected boolean isDashedLine() {
-        return UIManager.getBoolean("Tree.lineTypeDashed") || "Dashed".equals(getLineStyle());
+        return STYLE_DASHED.equals(getLineStyle());
     }
 
     private void drawDashedLine(final Graphics g, final int x, int y1, final int y2) {
@@ -703,13 +715,13 @@ public class DarkTreeUI extends BasicTreeUI implements PropertyChangeListener {
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
         String key = evt.getPropertyName();
-        if (STRIPED_CLIENT_PROPERTY.equals(key)) {
+        if (KEY_ALTERNATE_ROW_COLOR.equals(key)) {
             tree.repaint();
-        } else if ("JTree.renderBooleanAsCheckBox".equals(key)) {
+        } else if (DarkTreeUI.KEY_RENDER_BOOLEAN_AS_CHECKBOX.equals(key)) {
             tree.repaint();
-        } else if ("JTree.booleanRenderType".equals(key)) {
+        } else if (DarkTreeUI.KEY_BOOLEAN_RENDER_TYPE.equals(key)) {
             tree.repaint();
-        } else if ("JTree.lineStyle".equals(key)) {
+        } else if (KEY_LINE_STYLE.equals(key)) {
             tree.repaint();
         }
     }

core/src/main/java/com/github/weisj/darklaf/util/DarkUIUtil.java

@@ -51,7 +51,7 @@ public final class DarkUIUtil {
     public final static AlphaComposite GLOW_ALPHA = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f);
     public final static AlphaComposite DROP_ALPHA = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.8f);
     public final static AlphaComposite SHADOW_COMPOSITE = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.1f);
-    public static final boolean USE_QUARTZ = "true".equals(System.getProperty("apple.awt.graphics.UseQuartz"));
+    public static final boolean USE_QUARTZ = PropertyValue.TRUE.equals(System.getProperty("apple.awt.graphics.UseQuartz"));
     private static final Rectangle iconRect = new Rectangle();
     private static final Rectangle textRect = new Rectangle();
 
@@ -196,8 +196,8 @@ public final class DarkUIUtil {
     }
 
     public static void doNotCancelPopupSetup(final JComponent component) {
-        component.putClientProperty("doNotCancelPopup", DarkPopupMenuUI.HIDE_POPUP_KEY);
-        component.putClientProperty("doNotCancelOnScroll", Boolean.TRUE);
+        component.putClientProperty(DarkPopupMenuUI.KEY_DO_NOT_CANCEL_POPUP, DarkPopupMenuUI.HIDE_POPUP_VALUE);
+        component.putClientProperty(DarkPopupMenuUI.KEY_DO_NOT_CANCEL_ON_SCROLL, Boolean.TRUE);
     }
 
     public static boolean isInCell(final Component c) {

core/src/main/java/com/github/weisj/darklaf/util/GraphicsUtil.java

@@ -92,6 +92,6 @@ public final class GraphicsUtil {
     }
 
     public static boolean isHighDpiEnabled() {
-        return "true".equalsIgnoreCase(System.getProperty("hidpi"));
+        return PropertyValue.TRUE.equalsIgnoreCase(System.getProperty("hidpi"));
     }
 }

core/src/main/java/javax/swing/text/DefaultHighlighterDark/DarkHighlightPainter.java

@@ -24,6 +24,7 @@
 package javax.swing.text.DefaultHighlighterDark;
 
 import com.github.weisj.darklaf.color.ColorWrapper;
+import com.github.weisj.darklaf.ui.text.DarkTextUI;
 import com.github.weisj.darklaf.ui.text.StyleConstantsEx;
 import com.github.weisj.darklaf.util.GraphicsContext;
 import com.github.weisj.darklaf.util.GraphicsUtil;
@@ -31,12 +32,7 @@ import sun.swing.SwingUtilities2;
 
 import javax.swing.*;
 import javax.swing.plaf.TextUI;
-import javax.swing.text.BadLocationException;
-import javax.swing.text.DefaultHighlighter;
-import javax.swing.text.Highlighter;
-import javax.swing.text.JTextComponent;
-import javax.swing.text.Position;
-import javax.swing.text.View;
+import javax.swing.text.*;
 import java.awt.*;
 import java.awt.geom.Arc2D;
 import java.awt.geom.Area;
@@ -415,7 +411,7 @@ public class DarkHighlightPainter extends DefaultHighlighter.DefaultHighlightPai
 
     private boolean isRounded(final JTextComponent c) {
         return !suppressRounded
-                && (roundedEdges || Boolean.TRUE.equals(c.getClientProperty("JTextComponent.roundedSelection")));
+            && (roundedEdges || Boolean.TRUE.equals(c.getClientProperty(DarkTextUI.KEY_ROUNDED_SELECTION)));
     }
 
     private Shape paintExtension(final Graphics2D g2d, final JTextComponent c,

core/src/main/resources/com/github/weisj/darklaf/properties/overwrites.properties

@@ -26,3 +26,4 @@ Table.renderBooleanAsCheckBox  = tableBooleanRenderer
 Tree.renderBooleanAsCheckBox   = treeBooleanRenderer
 TextComponent.roundedSelection = roundedSelection
 Button.convertIconOnlyToShadow = shadowIconButtons
+Tree.defaultLineStyle          = treeLineStyle

core/src/main/resources/com/github/weisj/darklaf/properties/ui/tree.properties

@@ -38,7 +38,6 @@ Tree.lineUnselected                      = %gridLine
 
 Tree.selectionForegroundInactive         = %textSelectionForegroundInactive
 
-Tree.lineTypeDashed                      = false
 Tree.textBackground                      = %textBackground
 Tree.rowHeight                           = 22
 Tree.dropLineColor                       = %dropForeground
@@ -48,6 +47,7 @@ Tree.alternateRowBackground              = %backgroundAlternative
 
 Tree.renderBooleanAsCheckBox             = true
 Tree.booleanRenderType                   = checkBox
+Tree.defaultLineStyle                    = line
 
 Tree.editorBorderInsets                  = 2,5,2,5
 

core/src/test/java/UIDemo.java

@@ -3,6 +3,7 @@ import com.github.weisj.darklaf.components.text.SearchTextField;
 import com.github.weisj.darklaf.components.text.SearchTextFieldWithHistory;
 import com.github.weisj.darklaf.components.tristate.TristateCheckBox;
 import com.github.weisj.darklaf.icons.IconLoader;
+import com.github.weisj.darklaf.ui.slider.DarkSliderUI;
 import org.jdesktop.swingx.JXStatusBar;
 import org.jdesktop.swingx.JXTaskPane;
 import org.jdesktop.swingx.JXTaskPaneContainer;
@@ -208,19 +209,19 @@ public final class UIDemo {
                             setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
                         }});
                         add(new JSlider() {{
-                            putClientProperty("Slider.variant", "volume");
-                            putClientProperty("Slider.instantScrollEnabled", Boolean.TRUE);
+                            putClientProperty(DarkSliderUI.KEY_VARIANT, DarkSliderUI.VARIANT_VOLUME);
+                            putClientProperty(DarkSliderUI.KEY_INSTANT_SCROLL, Boolean.TRUE);
                         }});
                         add(new JSlider() {{
                             putClientProperty("Slider.variant", "volume");
                             putClientProperty("Slider.instantScrollEnabled", Boolean.TRUE);
-                            putClientProperty("Slider.volume.showIcon", Boolean.TRUE);
+                            putClientProperty(DarkSliderUI.KEY_SHOW_VOLUME_ICON, Boolean.TRUE);
                         }});
                         add(new JSlider() {{
                             setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
                             putClientProperty("Slider.variant", "volume");
                             putClientProperty("Slider.instantScrollEnabled", Boolean.TRUE);
-                            putClientProperty("Slider.volume.showIcon", Boolean.TRUE);
+                            putClientProperty(DarkSliderUI.KEY_SHOW_VOLUME_ICON, Boolean.TRUE);
                         }});
                     }});
                     panel.add(new JPanel() {{
@@ -277,7 +278,7 @@ public final class UIDemo {
                             setPaintLabels(true);
                             putClientProperty("Slider.variant", "volume");
                             putClientProperty("Slider.instantScrollEnabled", Boolean.TRUE);
-                            putClientProperty("Slider.volume.showIcon", Boolean.TRUE);
+                            putClientProperty(DarkSliderUI.KEY_SHOW_VOLUME_ICON, Boolean.TRUE);
                         }});
                         add(new JSlider() {{
                             setSnapToTicks(true);
@@ -288,7 +289,7 @@ public final class UIDemo {
                             setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
                             putClientProperty("Slider.variant", "volume");
                             putClientProperty("Slider.instantScrollEnabled", Boolean.TRUE);
-                            putClientProperty("Slider.volume.showIcon", Boolean.TRUE);
+                            putClientProperty(DarkSliderUI.KEY_SHOW_VOLUME_ICON, Boolean.TRUE);
                         }});
                     }});
                     panel.add(new JPanel() {{
@@ -309,14 +310,14 @@ public final class UIDemo {
                             setOrientation(VERTICAL);
                             putClientProperty("Slider.variant", "volume");
                             putClientProperty("Slider.instantScrollEnabled", Boolean.TRUE);
-                            putClientProperty("Slider.volume.showIcon", Boolean.TRUE);
+                            putClientProperty(DarkSliderUI.KEY_SHOW_VOLUME_ICON, Boolean.TRUE);
                         }});
                         add(new JSlider() {{
                             setOrientation(VERTICAL);
                             setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
                             putClientProperty("Slider.variant", "volume");
                             putClientProperty("Slider.instantScrollEnabled", Boolean.TRUE);
-                            putClientProperty("Slider.volume.showIcon", Boolean.TRUE);
+                            putClientProperty(DarkSliderUI.KEY_SHOW_VOLUME_ICON, Boolean.TRUE);
                         }});
                     }});
                     panel.add(new JPanel() {{
@@ -379,7 +380,7 @@ public final class UIDemo {
                             setPaintLabels(true);
                             putClientProperty("Slider.variant", "volume");
                             putClientProperty("Slider.instantScrollEnabled", Boolean.TRUE);
-                            putClientProperty("Slider.volume.showIcon", Boolean.TRUE);
+                            putClientProperty(DarkSliderUI.KEY_SHOW_VOLUME_ICON, Boolean.TRUE);
                         }});
                         add(new JSlider() {{
                             setOrientation(VERTICAL);
@@ -391,7 +392,7 @@ public final class UIDemo {
                             setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
                             putClientProperty("Slider.variant", "volume");
                             putClientProperty("Slider.instantScrollEnabled", Boolean.TRUE);
-                            putClientProperty("Slider.volume.showIcon", Boolean.TRUE);
+                            putClientProperty(DarkSliderUI.KEY_SHOW_VOLUME_ICON, Boolean.TRUE);
                         }});
                     }});
 

core/src/test/java/ui/button/ToggleButtonDemo.java

@@ -24,6 +24,7 @@
 package ui.button;
 
 import com.github.weisj.darklaf.icons.IconLoader;
+import com.github.weisj.darklaf.ui.button.DarkToggleButtonUI;
 import ui.ComponentDemo;
 import ui.DemoPanel;
 
@@ -52,13 +53,13 @@ public class ToggleButtonDemo implements ComponentDemo {
             addActionListener(e -> button.setComponentOrientation(isSelected() ? ComponentOrientation.LEFT_TO_RIGHT
                                                                                : ComponentOrientation.RIGHT_TO_LEFT));
         }});
-        controlPanel.add(new JCheckBox("JToggleButton.isTreeCellEditor") {{
+        controlPanel.add(new JCheckBox(DarkToggleButtonUI.KEY_IS_TREE_EDITOR) {{
             setSelected(false);
-            addActionListener(e -> button.putClientProperty("JToggleButton.isTreeCellEditor", isSelected()));
+            addActionListener(e -> button.putClientProperty(DarkToggleButtonUI.KEY_IS_TREE_EDITOR, isSelected()));
         }});
-        controlPanel.add(new JCheckBox("JToggleButton.isTableCellEditor") {{
+        controlPanel.add(new JCheckBox(DarkToggleButtonUI.KEY_IS_TABLE_EDITOR) {{
             setSelected(false);
-            addActionListener(e -> button.putClientProperty("JToggleButton.isTableCellEditor", isSelected()));
+            addActionListener(e -> button.putClientProperty(DarkToggleButtonUI.KEY_IS_TABLE_EDITOR, isSelected()));
         }});
         controlPanel.add(new JCheckBox("Rollover") {{
             setSelected(button.isRolloverEnabled());

core/src/test/java/ui/checkBox/CheckBoxDemo.java

@@ -23,6 +23,7 @@
  */
 package ui.checkBox;
 
+import com.github.weisj.darklaf.ui.button.DarkToggleButtonUI;
 import ui.ComponentDemo;
 import ui.DemoPanel;
 
@@ -54,13 +55,13 @@ public class CheckBoxDemo implements ComponentDemo {
             setSelected(button.isRolloverEnabled());
             addActionListener(e -> button.setRolloverEnabled(isSelected()));
         }});
-        controlPanel.add(new JCheckBox("JToggleButton.isTreeCellEditor") {{
+        controlPanel.add(new JCheckBox(DarkToggleButtonUI.KEY_IS_TREE_EDITOR) {{
             setSelected(false);
-            addActionListener(e -> button.putClientProperty("JToggleButton.isTreeCellEditor", isSelected()));
+            addActionListener(e -> button.putClientProperty(DarkToggleButtonUI.KEY_IS_TREE_EDITOR, isSelected()));
         }});
-        controlPanel.add(new JCheckBox("JToggleButton.isTableCellEditor") {{
+        controlPanel.add(new JCheckBox(DarkToggleButtonUI.KEY_IS_TABLE_EDITOR) {{
             setSelected(false);
-            addActionListener(e -> button.putClientProperty("JToggleButton.isTableCellEditor", isSelected()));
+            addActionListener(e -> button.putClientProperty(DarkToggleButtonUI.KEY_IS_TABLE_EDITOR, isSelected()));
         }});
         return panel;
     }

core/src/test/java/ui/checkBox/TriCheckBoxDemo.java

@@ -24,6 +24,7 @@
 package ui.checkBox;
 
 import com.github.weisj.darklaf.components.tristate.TristateCheckBox;
+import com.github.weisj.darklaf.ui.button.DarkToggleButtonUI;
 import ui.ComponentDemo;
 import ui.DemoPanel;
 
@@ -55,13 +56,13 @@ public class TriCheckBoxDemo implements ComponentDemo {
             setSelected(button.isRolloverEnabled());
             addActionListener(e -> button.setRolloverEnabled(isSelected()));
         }});
-        controlPanel.add(new JCheckBox("JToggleButton.isTreeCellEditor") {{
+        controlPanel.add(new JCheckBox(DarkToggleButtonUI.KEY_IS_TREE_EDITOR) {{
             setSelected(false);
-            addActionListener(e -> button.putClientProperty("JToggleButton.isTreeCellEditor", isSelected()));
+            addActionListener(e -> button.putClientProperty(DarkToggleButtonUI.KEY_IS_TREE_EDITOR, isSelected()));
         }});
-        controlPanel.add(new JCheckBox("JToggleButton.isTableCellEditor") {{
+        controlPanel.add(new JCheckBox(DarkToggleButtonUI.KEY_IS_TABLE_EDITOR) {{
             setSelected(false);
-            addActionListener(e -> button.putClientProperty("JToggleButton.isTableCellEditor", isSelected()));
+            addActionListener(e -> button.putClientProperty(DarkToggleButtonUI.KEY_IS_TABLE_EDITOR, isSelected()));
         }});
         return panel;
     }

core/src/test/java/ui/comboBox/ComboBoxDemo.java

@@ -23,6 +23,7 @@
  */
 package ui.comboBox;
 
+import com.github.weisj.darklaf.util.PropertyKey;
 import ui.ComponentDemo;
 import ui.DemoPanel;
 
@@ -48,7 +49,7 @@ public class ComboBoxDemo implements ComponentDemo {
             setSelected(comboBox.isEnabled());
             addActionListener(e -> comboBox.setEnabled(isSelected()));
         }});
-        controlPanel.add(new JCheckBox("editable") {{
+        controlPanel.add(new JCheckBox(PropertyKey.EDITABLE) {{
             setSelected(comboBox.isEditable());
             addActionListener(e -> comboBox.setEditable(isSelected()));
         }});

core/src/test/java/ui/list/ListDemo.java

@@ -23,6 +23,7 @@
  */
 package ui.list;
 
+import com.github.weisj.darklaf.ui.list.DarkListUI;
 import ui.ComponentDemo;
 import ui.DemoPanel;
 
@@ -40,15 +41,15 @@ public final class ListDemo implements ComponentDemo {
     @Override
     public JComponent createComponent() {
         String[] week = {"Monday", "Tuesday", "Wednesday",
-            "Thursday", "Friday", "Saturday", "Sunday"};
+                         "Thursday", "Friday", "Saturday", "Sunday"};
         JList<String> list = new JList<>(week);
         list.setSelectedIndex(2);
         DemoPanel panel = new DemoPanel(list, new BorderLayout(), 0);
 
         JPanel controlPanel = panel.addControls();
-        controlPanel.add(new JCheckBox("JList.alternateRowColor") {{
-            setSelected(Boolean.TRUE.equals(list.getClientProperty("JList.alternateRowColor")));
-            addActionListener(e -> list.putClientProperty("JList.alternateRowColor", isSelected()));
+        controlPanel.add(new JCheckBox(DarkListUI.KEY_ALTERNATE_ROW_COLOR) {{
+            setSelected(Boolean.TRUE.equals(list.getClientProperty(DarkListUI.KEY_ALTERNATE_ROW_COLOR)));
+            addActionListener(e -> list.putClientProperty(DarkListUI.KEY_ALTERNATE_ROW_COLOR, isSelected()));
         }}, "span");
 
         controlPanel = panel.addControls();

core/src/test/java/ui/radioButton/RadioButtonDemo.java

@@ -23,6 +23,7 @@
  */
 package ui.radioButton;
 
+import com.github.weisj.darklaf.ui.button.DarkToggleButtonUI;
 import ui.ComponentDemo;
 import ui.DemoPanel;
 
@@ -54,13 +55,13 @@ public class RadioButtonDemo implements ComponentDemo {
             setSelected(button.isRolloverEnabled());
             addActionListener(e -> button.setRolloverEnabled(isSelected()));
         }});
-        controlPanel.add(new JCheckBox("JToggleButton.isTreeCellEditor") {{
+        controlPanel.add(new JCheckBox(DarkToggleButtonUI.KEY_IS_TREE_EDITOR) {{
             setSelected(false);
-            addActionListener(e -> button.putClientProperty("JToggleButton.isTreeCellEditor", isSelected()));
+            addActionListener(e -> button.putClientProperty(DarkToggleButtonUI.KEY_IS_TREE_EDITOR, isSelected()));
         }});
-        controlPanel.add(new JCheckBox("JToggleButton.isTableCellEditor") {{
+        controlPanel.add(new JCheckBox(DarkToggleButtonUI.KEY_IS_TABLE_EDITOR) {{
             setSelected(false);
-            addActionListener(e -> button.putClientProperty("JToggleButton.isTableCellEditor", isSelected()));
+            addActionListener(e -> button.putClientProperty(DarkToggleButtonUI.KEY_IS_TABLE_EDITOR, isSelected()));
         }});
         return panel;
     }

core/src/test/java/ui/slider/SliderDemo.java

@@ -23,6 +23,7 @@
  */
 package ui.slider;
 
+import com.github.weisj.darklaf.ui.slider.DarkSliderUI;
 import ui.ComponentDemo;
 import ui.DemoPanel;
 
@@ -83,14 +84,16 @@ public class SliderDemo implements ComponentDemo {
             setSelected(slider.getPaintTrack());
             addActionListener(e -> slider.setPaintTrack(isSelected()));
         }});
-        controlPanel.add(new JCheckBox("Slider.variant = volume") {{
-            addActionListener(e -> slider.putClientProperty("Slider.variant", isSelected() ? "volume" : null));
+        controlPanel.add(new JCheckBox(DarkSliderUI.KEY_VARIANT + " = " + DarkSliderUI.VARIANT_VOLUME) {{
+            addActionListener(e -> slider.putClientProperty(DarkSliderUI.KEY_VARIANT, isSelected()
+                                                                                      ? DarkSliderUI.VARIANT_VOLUME
+                                                                                      : null));
         }});
-        controlPanel.add(new JCheckBox("Slider.instantScrollEnabled") {{
-            addActionListener(e -> slider.putClientProperty("Slider.instantScrollEnabled", isSelected()));
+        controlPanel.add(new JCheckBox(DarkSliderUI.KEY_INSTANT_SCROLL) {{
+            addActionListener(e -> slider.putClientProperty(DarkSliderUI.KEY_INSTANT_SCROLL, isSelected()));
         }});
-        controlPanel.add(new JCheckBox("Slider.volume.showIcon") {{
-            addActionListener(e -> slider.putClientProperty("Slider.volume.showIcon", isSelected()));
+        controlPanel.add(new JCheckBox(DarkSliderUI.KEY_SHOW_VOLUME_ICON) {{
+            addActionListener(e -> slider.putClientProperty(DarkSliderUI.KEY_SHOW_VOLUME_ICON, isSelected()));
         }});
         return panel;
     }

core/src/test/java/ui/table/TableDemo.java

@@ -24,6 +24,7 @@
 package ui.table;
 
 import com.github.weisj.darklaf.ui.table.DarkTableCellEditor;
+import com.github.weisj.darklaf.util.PropertyKey;
 import ui.ComponentDemo;
 import ui.DemoPanel;
 
@@ -80,7 +81,7 @@ public class TableDemo implements ComponentDemo {
             setSelected(table.isEnabled());
             addActionListener(e -> table.setEnabled(isSelected()));
         }});
-        controlPanel.add(new JCheckBox("editable") {{
+        controlPanel.add(new JCheckBox(PropertyKey.EDITABLE) {{
             setSelected(editable.get());
             addActionListener(e -> editable.set(isSelected()));
         }});

core/src/test/java/ui/text/PasswordFieldDemo.java

@@ -23,6 +23,7 @@
  */
 package ui.text;
 
+import com.github.weisj.darklaf.util.PropertyKey;
 import ui.ComponentDemo;
 import ui.DemoPanel;
 
@@ -45,7 +46,7 @@ public class PasswordFieldDemo implements ComponentDemo {
             setSelected(textField.isEnabled());
             addActionListener(e -> textField.setEnabled(isSelected()));
         }});
-        controlPanel.add(new JCheckBox("editable") {{
+        controlPanel.add(new JCheckBox(PropertyKey.EDITABLE) {{
             setSelected(textField.isEditable());
             addActionListener(e -> textField.setEditable(isSelected()));
         }});

core/src/test/java/ui/text/TextComponentDemo.java

@@ -24,6 +24,7 @@
 package ui.text;
 
 import com.github.weisj.darklaf.ui.text.DarkTextBorder;
+import com.github.weisj.darklaf.util.PropertyKey;
 import com.github.weisj.darklaf.util.StringUtil;
 import ui.ComponentDemo;
 import ui.DemoPanel;
@@ -47,7 +48,7 @@ public abstract class TextComponentDemo<T extends JTextComponent> implements Com
             setSelected(text.isEnabled());
             addActionListener(e -> text.setEnabled(isSelected()));
         }});
-        controlPanel.add(new JCheckBox("editable") {{
+        controlPanel.add(new JCheckBox(PropertyKey.EDITABLE) {{
             setSelected(text.isEditable());
             addActionListener(e -> text.setEditable(isSelected()));
         }});

core/src/test/java/ui/text/TextFieldDemo.java

@@ -23,6 +23,7 @@
  */
 package ui.text;
 
+import com.github.weisj.darklaf.util.PropertyKey;
 import ui.ComponentDemo;
 import ui.DemoPanel;
 
@@ -45,7 +46,7 @@ public class TextFieldDemo implements ComponentDemo {
             setSelected(textField.isEnabled());
             addActionListener(e -> textField.setEnabled(isSelected()));
         }});
-        controlPanel.add(new JCheckBox("editable") {{
+        controlPanel.add(new JCheckBox(PropertyKey.EDITABLE) {{
             setSelected(textField.isEditable());
             addActionListener(e -> textField.setEditable(isSelected()));
         }});

core/src/test/java/ui/tree/TreeDemo.java

@@ -25,6 +25,8 @@ package ui.tree;
 
 import com.github.weisj.darklaf.components.OverlayScrollPane;
 import com.github.weisj.darklaf.components.SelectableTreeNode;
+import com.github.weisj.darklaf.ui.tree.DarkTreeUI;
+import com.github.weisj.darklaf.util.PropertyKey;
 import net.miginfocom.swing.MigLayout;
 import ui.ComponentDemo;
 import ui.DemoPanel;
@@ -58,7 +60,7 @@ public class TreeDemo implements ComponentDemo {
         DemoPanel panel = new DemoPanel(new OverlayScrollPane(tree), new BorderLayout(), 0);
         JPanel controlPanel = panel.addControls();
         controlPanel.setLayout(new MigLayout("fillx, wrap 2", "[][grow]"));
-        controlPanel.add(new JCheckBox("editable") {{
+        controlPanel.add(new JCheckBox(PropertyKey.EDITABLE) {{
             setSelected(tree.isEditable());
             addActionListener(e -> tree.setEditable(isSelected()));
         }});
@@ -71,20 +73,20 @@ public class TreeDemo implements ComponentDemo {
             setSelected(tree.getShowsRootHandles());
             addActionListener(e -> tree.setShowsRootHandles(isSelected()));
         }});
-        controlPanel.add(new JCheckBox("JTree.alternateRowColor") {{
-            setSelected(Boolean.TRUE.equals(tree.getClientProperty("JTree.alternateRowColor")));
-            addActionListener(e -> tree.putClientProperty("JTree.alternateRowColor", isSelected()));
+        controlPanel.add(new JCheckBox(DarkTreeUI.KEY_ALTERNATE_ROW_COLOR) {{
+            setSelected(Boolean.TRUE.equals(tree.getClientProperty(DarkTreeUI.KEY_ALTERNATE_ROW_COLOR)));
+            addActionListener(e -> tree.putClientProperty(DarkTreeUI.KEY_ALTERNATE_ROW_COLOR, isSelected()));
         }});
-        controlPanel.add(new JCheckBox("JTree.renderBooleanAsCheckBox") {{
-            setSelected(Boolean.TRUE.equals(tree.getClientProperty("JTree.renderBooleanAsCheckBox")));
-            addActionListener(e -> tree.putClientProperty("JTree.renderBooleanAsCheckBox", isSelected()));
+        controlPanel.add(new JCheckBox(DarkTreeUI.KEY_RENDER_BOOLEAN_AS_CHECKBOX) {{
+            setSelected(Boolean.TRUE.equals(tree.getClientProperty(DarkTreeUI.KEY_RENDER_BOOLEAN_AS_CHECKBOX)));
+            addActionListener(e -> tree.putClientProperty(DarkTreeUI.KEY_RENDER_BOOLEAN_AS_CHECKBOX, isSelected()));
         }}, "span");
-        controlPanel.add(new JLabel("JTree.booleanRenderType:", JLabel.RIGHT));
+        controlPanel.add(new JLabel(DarkTreeUI.KEY_BOOLEAN_RENDER_TYPE + ":", JLabel.RIGHT));
         controlPanel.add(new JComboBox<String>() {{
-            addItem("checkBox");
-            addItem("radioButton");
-            setSelectedItem(tree.getClientProperty("JTree.booleanRenderType"));
-            addItemListener(e -> tree.putClientProperty("JTree.booleanRenderType", e.getItem()));
+            addItem(DarkTreeUI.RENDER_TYPE_CHECKBOX);
+            addItem(DarkTreeUI.RENDER_TYPE_RADIOBUTTON);
+            setSelectedItem(tree.getClientProperty(DarkTreeUI.KEY_BOOLEAN_RENDER_TYPE));
+            addItemListener(e -> tree.putClientProperty(DarkTreeUI.KEY_BOOLEAN_RENDER_TYPE, e.getItem()));
         }});
         controlPanel.add(new JLabel("JTree.lineStyle:", JLabel.RIGHT));
         controlPanel.add(new JComboBox<String>() {{

macos/src/main/java/com/github/weisj/darklaf/platform/macos/ui/MacOSTitlePane.java

@@ -25,6 +25,7 @@ package com.github.weisj.darklaf.platform.macos.ui;
 
 import com.github.weisj.darklaf.decorations.CustomTitlePane;
 import com.github.weisj.darklaf.platform.macos.JNIDecorationsMacOS;
+import com.github.weisj.darklaf.util.PropertyKey;
 
 import javax.swing.*;
 import java.awt.*;
@@ -237,7 +238,7 @@ public class MacOSTitlePane extends CustomTitlePane {
     protected class PropertyChangeHandler implements PropertyChangeListener {
         public void propertyChange(final PropertyChangeEvent pce) {
             String name = pce.getPropertyName();
-            if ("title".equals(name)) {
+            if (PropertyKey.TITLE.equals(name)) {
                 titleLabel.setText(pce.getNewValue() == null ? "" : pce.getNewValue().toString());
                 repaint();
             }

property-loader/src/main/java/com/github/weisj/darklaf/PropertyLoader.java

@@ -27,6 +27,7 @@ import com.github.weisj.darklaf.icons.DarkUIAwareIcon;
 import com.github.weisj.darklaf.icons.EmptyIcon;
 import com.github.weisj.darklaf.icons.IconLoader;
 import com.github.weisj.darklaf.util.ColorUtil;
+import com.github.weisj.darklaf.util.PropertyValue;
 import com.github.weisj.darklaf.util.StringUtil;
 
 import javax.swing.*;
@@ -122,7 +123,7 @@ public final class PropertyLoader {
     private static Object parseValue(final String propertyKey, final String value,
                                      final boolean ignoreRequest, final Map<Object, Object> defaults,
                                      final IconLoader iconLoader) {
-        if ("null".equals(value)) {
+        if (PropertyValue.NULL.equals(value)) {
             return null;
         }
         String key = propertyKey;
@@ -148,22 +149,22 @@ public final class PropertyLoader {
             returnVal = parseIcon(value, iconLoader);
         } else if (key.endsWith("Size") || key.endsWith(".size")) {
             returnVal = parseSize(value);
-        } else if ("null".equalsIgnoreCase(value)) {
+        } else if (PropertyValue.NULL.equalsIgnoreCase(value)) {
             returnVal = null;
         } else if (value.startsWith("%")) {
             String val = value.substring(1);
             if (!defaults.containsKey(val)) {
                 LOGGER.warning("Could not reference value '" + val + "'while loading '" + key + "'. " +
-                                       "May be a forward reference");
+                                   "May be a forward reference");
             }
             returnVal = defaults.get(val);
         }
         if (returnVal instanceof LoadError) {
             final Color color = ColorUtil.fromHex(value, null);
             final Integer invVal = getInteger(value);
-            final Boolean boolVal = "true".equalsIgnoreCase(value)
+            final Boolean boolVal = PropertyValue.TRUE.equalsIgnoreCase(value)
                                     ? Boolean.TRUE
-                                    : "false".equalsIgnoreCase(value) ? Boolean.FALSE : null;
+                                    : PropertyValue.FALSE.equalsIgnoreCase(value) ? Boolean.FALSE : null;
             if (color != null && (value.length() == 6 || value.length() == 8)) {
                 return new ColorUIResource(color);
             } else if (invVal != null) {

utils/src/main/java/com/github/weisj/darklaf/util/PropertyKey.java

@@ -0,0 +1,46 @@
+/*
+ * 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.util;
+
+public class PropertyKey {
+    public static final String COMPONENT_ORIENTATION = "componentOrientation";
+    public static final String LAYOUT_ORIENTATION = "layoutOrientation";
+    public static final String ORIENTATION = "orientation";
+    public static final String VALUE = "value";
+    public static final String HTML = "html";
+    public static final String COMPONENT = "component";
+    public static final String OPAQUE = "opaque";
+    public static final String ANCESTOR = "ancestor";
+    public static final String EDITABLE = "editable";
+    public static final String BACKGROUND = "background";
+    public static final String FOREGROUND = "foreground";
+    public static final String FONT = "font";
+    public static final String DOCUMENT = "document";
+    public static final String PAINTING_FOR_PRINT = "paintingForPrint";
+    public static final String CARET = "caret";
+    public static final String WINDOW_DECORATIONS_STYLE = "windowDecorationStyle";
+    public static final String COMPONENT_POPUP_MENU = "componentPopupMenu";
+    public static final String TITLE = "title";
+    public static final String VISIBLE = "visible";
+}

utils/src/main/java/com/github/weisj/darklaf/util/PropertyValue.java

@@ -0,0 +1,30 @@
+/*
+ * 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.util;
+
+public class PropertyValue {
+    public static final String TRUE = "true";
+    public static final String FALSE = "false";
+    public static final String NULL = "null";
+}

windows/src/main/java/com/github/weisj/darklaf/platform/windows/ui/WindowsTitlePane.java

@@ -29,6 +29,7 @@ import com.github.weisj.darklaf.icons.ScaledIcon;
 import com.github.weisj.darklaf.icons.ToggleIcon;
 import com.github.weisj.darklaf.platform.PointerUtil;
 import com.github.weisj.darklaf.platform.windows.JNIDecorationsWindows;
+import com.github.weisj.darklaf.util.PropertyKey;
 import com.github.weisj.darklaf.util.Scale;
 import sun.awt.SunToolkit;
 
@@ -46,6 +47,9 @@ import java.util.List;
  * @author Jannis Weis
  */
 public class WindowsTitlePane extends CustomTitlePane {
+    public static final String KEY_RESIZABLE = "resizable";
+    public static final String KEY_STATE = "state";
+    public static final String KEY_ICON_IMAGE = "iconImage";
     private static final int PAD = 5;
     private static final int BAR_HEIGHT = 28;
     private static final int BUTTON_WIDTH = 46;
@@ -771,26 +775,26 @@ public class WindowsTitlePane extends CustomTitlePane {
     protected class PropertyChangeHandler implements PropertyChangeListener {
         public void propertyChange(final PropertyChangeEvent pce) {
             String name = pce.getPropertyName();
-            if ("resizable".equals(name) || "state".equals(name)) {
+            if (KEY_RESIZABLE.equals(name) || KEY_STATE.equals(name)) {
                 Frame frame = getFrame();
                 if (frame != null) {
                     setState(frame.getExtendedState(), true);
                 }
-                if ("resizable".equals(name)) {
+                if (KEY_RESIZABLE.equals(name)) {
                     JNIDecorationsWindows.setResizable(windowHandle, Boolean.TRUE.equals(pce.getNewValue()));
                     getRootPane().repaint();
                 }
-            } else if ("title".equals(name)) {
+            } else if (PropertyKey.TITLE.equals(name)) {
                 titleLabel.setText(pce.getNewValue() == null ? "" : pce.getNewValue().toString());
                 repaint();
-            } else if ("componentOrientation".equals(name)) {
+            } else if (PropertyKey.COMPONENT_ORIENTATION.equals(name)) {
                 revalidate();
                 repaint();
-            } else if ("iconImage".equals(name)) {
+            } else if (KEY_ICON_IMAGE.equals(name)) {
                 updateSystemIcon();
                 revalidate();
                 repaint();
-            } else if ("background".equals(name) && pce.getNewValue() instanceof Color) {
+            } else if (PropertyKey.BACKGROUND.equals(name) && pce.getNewValue() instanceof Color) {
                 Color color = (Color) pce.getNewValue();
                 if (color == null) return;
                 JNIDecorationsWindows.setBackground(windowHandle, color.getRed(), color.getGreen(), color.getBlue());