Slider:

- changed default color to bluish
- made track thinner (2px, was 3px)
- made thumb larger (12px, was 11px)
- added thumb outline focus indicator (4px wide)
- slider component height increased from 11px to 20px
- support painting thumb border
- support different colors for thumb background and colored track

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatSliderUI.java

@@ -21,7 +21,9 @@ import java.awt.Dimension;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Rectangle;
+import java.awt.Shape;
 import java.awt.event.MouseEvent;
+import java.awt.geom.Ellipse2D;
 import java.awt.geom.Path2D;
 import java.awt.geom.RoundRectangle2D;
 import javax.swing.JComponent;
@@ -51,13 +53,18 @@ import com.formdev.flatlaf.util.UIScale;
  *
  * @uiDefault Slider.trackWidth				int
  * @uiDefault Slider.thumbWidth				int
+ * @uiDefault Slider.focusWidth				int
+ * @uiDefault Slider.trackValueColor		Color	optional; defaults to Slider.thumbColor
  * @uiDefault Slider.trackColor				Color
  * @uiDefault Slider.thumbColor				Color
+ * @uiDefault Slider.thumbBorderColor		Color	optional; if null, no border is painted
  * @uiDefault Slider.focusedColor			Color	optional; defaults to Component.focusColor
+ * @uiDefault Slider.focusedThumbBorderColor Color	optional; defaults to Component.focusedBorderColor
  * @uiDefault Slider.hoverThumbColor		Color	optional
  * @uiDefault Slider.pressedThumbColor		Color	optional
  * @uiDefault Slider.disabledTrackColor		Color
  * @uiDefault Slider.disabledThumbColor		Color
+ * @uiDefault Slider.disabledThumbBorderColor Color	optional; defaults to Component.disabledBorderColor
  *
  * @author Karl Tauber
  */
@@ -66,14 +73,19 @@ public class FlatSliderUI
 {
 	protected int trackWidth;
 	protected int thumbWidth;
+	protected int focusWidth;
 
+	protected Color trackValueColor;
 	protected Color trackColor;
 	protected Color thumbColor;
-	protected Color focusColor;
+	protected Color thumbBorderColor;
+	protected Color focusedColor;
+	protected Color focusedThumbBorderColor;
 	protected Color hoverThumbColor;
 	protected Color pressedThumbColor;
 	protected Color disabledTrackColor;
 	protected Color disabledThumbColor;
+	protected Color disabledThumbBorderColor;
 
 	protected boolean thumbHover;
 	protected boolean thumbPressed;
@@ -94,27 +106,36 @@ public class FlatSliderUI
 
 		trackWidth = UIManager.getInt( "Slider.trackWidth" );
 		thumbWidth = UIManager.getInt( "Slider.thumbWidth" );
+		focusWidth = FlatUIUtils.getUIInt( "Slider.focusWidth", 4 );
 
+		trackValueColor = FlatUIUtils.getUIColor( "Slider.trackValueColor", "Slider.thumbColor" );
 		trackColor = UIManager.getColor( "Slider.trackColor" );
 		thumbColor = UIManager.getColor( "Slider.thumbColor" );
-		focusColor = FlatUIUtils.getUIColor( "Slider.focusedColor", "Component.focusColor" );
+		thumbBorderColor = UIManager.getColor( "Slider.thumbBorderColor" );
+		focusedColor = FlatUIUtils.getUIColor( "Slider.focusedColor", "Component.focusColor" );
+		focusedThumbBorderColor = FlatUIUtils.getUIColor( "Slider.focusedThumbBorderColor", "Component.focusedBorderColor" );
 		hoverThumbColor = UIManager.getColor( "Slider.hoverThumbColor" );
 		pressedThumbColor = UIManager.getColor( "Slider.pressedThumbColor" );
 		disabledTrackColor = UIManager.getColor( "Slider.disabledTrackColor" );
 		disabledThumbColor = UIManager.getColor( "Slider.disabledThumbColor" );
+		disabledThumbBorderColor = FlatUIUtils.getUIColor( "Slider.disabledThumbBorderColor", "Component.disabledBorderColor" );
 	}
 
 	@Override
 	protected void uninstallDefaults( JSlider slider ) {
 		super.uninstallDefaults( slider );
 
+		trackValueColor = null;
 		trackColor = null;
 		thumbColor = null;
-		focusColor = null;
+		thumbBorderColor = null;
+		focusedColor = null;
+		focusedThumbBorderColor = null;
 		hoverThumbColor = null;
 		pressedThumbColor = null;
 		disabledTrackColor = null;
 		disabledThumbColor = null;
+		disabledThumbBorderColor = null;
 	}
 
 	@Override
@@ -149,13 +170,28 @@ public class FlatSliderUI
 
 	@Override
 	protected Dimension getThumbSize() {
-		return new Dimension( UIScale.scale( thumbWidth ), UIScale.scale( thumbWidth ) );
+		int fw = UIScale.scale( focusWidth );
+		int w = UIScale.scale( thumbWidth ) + fw + fw;
+		return new Dimension( w, w );
 	}
 
 	@Override
 	public void paint( Graphics g, JComponent c ) {
 		FlatUIUtils.setRenderingHints( (Graphics2D) g );
 
+/*debug
+		g.setColor( Color.gray );
+		g.drawRect( 0, 0, c.getWidth() - 1, c.getHeight() - 1 );
+		g.setColor( Color.orange );
+		g.drawRect( focusRect.x, focusRect.y, focusRect.width - 1, focusRect.height - 1 );
+		g.setColor( Color.magenta );
+		g.drawRect( contentRect.x, contentRect.y, contentRect.width - 1, contentRect.height - 1 );
+		g.setColor( Color.blue );
+		g.drawRect( trackRect.x, trackRect.y, trackRect.width - 1, trackRect.height - 1 );
+		g.setColor( Color.red );
+		g.drawRect( thumbRect.x, thumbRect.y, thumbRect.width - 1, thumbRect.height - 1 );
+debug*/
+
 		super.paint( g, c );
 	}
 
@@ -197,7 +233,7 @@ public class FlatSliderUI
 		}
 
 		if( coloredTrack != null ) {
-			g.setColor( thumbColor );
+			g.setColor( trackValueColor );
 			((Graphics2D)g).fill( coloredTrack );
 		}
 
@@ -208,26 +244,49 @@ public class FlatSliderUI
 	@Override
 	public void paintThumb( Graphics g ) {
 		Color color = stateColor( slider, thumbHover, thumbPressed,
-			thumbColor, disabledThumbColor, focusColor, hoverThumbColor, pressedThumbColor );
+			thumbColor, disabledThumbColor, null, hoverThumbColor, pressedThumbColor );
 		color = FlatUIUtils.deriveColor( color, thumbColor );
 
-		paintThumb( g, slider, thumbRect, isRoundThumb(), color );
+		Color borderColor = (thumbBorderColor != null)
+			? stateColor( slider, false, false, thumbBorderColor, disabledThumbBorderColor, focusedThumbBorderColor, null, null )
+			: null;
+
+		paintThumb( g, slider, thumbRect, isRoundThumb(), color, borderColor, focusedColor, focusWidth );
 	}
 
 	public static void paintThumb( Graphics g, JSlider slider, Rectangle thumbRect, boolean roundThumb,
-		Color thumbColor )
+		Color thumbColor, Color thumbBorderColor, Color focusedColor, int focusWidth )
 	{
-		g.setColor( thumbColor );
+		int fw = UIScale.scale( focusWidth );
+		int x = thumbRect.x + fw;
+		int y = thumbRect.y + fw;
+		int width = thumbRect.width - fw - fw;
+		int height = thumbRect.height - fw - fw;
+		boolean focused = FlatUIUtils.isPermanentFocusOwner( slider );
 
-		if( roundThumb )
-			g.fillOval( thumbRect.x, thumbRect.y, thumbRect.width, thumbRect.height );
-		else {
-			double w = thumbRect.width;
-			double h = thumbRect.height;
-			double wh = w / 2;
+		if( roundThumb ) {
+			// paint thumb focus border
+			if( focused ) {
+				g.setColor( focusedColor );
+				g.fillOval( thumbRect.x, thumbRect.y, thumbRect.width, thumbRect.height );
+			}
 
-			Path2D thumb = FlatUIUtils.createPath( 0,0, w,0, w,(h - wh), wh,h,  0,(h - wh) );
+			if( thumbBorderColor != null ) {
+				// paint thumb border
+				g.setColor( thumbBorderColor );
+				g.fillOval( x, y, width, height );
 
+				// paint thumb background
+				float lw = UIScale.scale( 1f );
+				g.setColor( thumbColor );
+				((Graphics2D)g).fill( new Ellipse2D.Float( x + lw, y + lw,
+					width - lw - lw, height - lw - lw ) );
+			} else {
+				// paint thumb background
+				g.setColor( thumbColor );
+				g.fillOval( x, y, width, height );
+			}
+		} else {
 			Graphics2D g2 = (Graphics2D) g.create();
 			try {
 				g2.translate( thumbRect.x, thumbRect.y );
@@ -240,13 +299,51 @@ public class FlatSliderUI
 						g2.rotate( Math.toRadians( 90 ) );
 					}
 				}
-				g2.fill( thumb );
+
+				// paint thumb focus border
+				if( focused ) {
+					g2.setColor( focusedColor );
+					g2.fill( createDirectionalThumbShape( 0, 0,
+						thumbRect.width, thumbRect.height + (fw * 0.4142f), fw ) );
+				}
+
+				if( thumbBorderColor != null ) {
+					// paint thumb border
+					g2.setColor( thumbBorderColor );
+					g2.fill( createDirectionalThumbShape( fw, fw, width, height, 0 ) );
+
+					// paint thumb background
+					float lw = UIScale.scale( 1f );
+					g2.setColor( thumbColor );
+					g2.fill( createDirectionalThumbShape( fw + lw, fw + lw,
+						width - lw - lw, height - lw - lw - (lw * 0.4142f), 0 ) );
+				} else {
+					// paint thumb background
+					g2.setColor( thumbColor );
+					g2.fill( createDirectionalThumbShape( fw, fw, width, height, 0 ) );
+				}
 			} finally {
 				g2.dispose();
 			}
 		}
 	}
 
+	public static Shape createDirectionalThumbShape( double x, double y, double w, double h, double arc ) {
+		double wh = w / 2;
+
+		Path2D path = new Path2D.Float();
+		path.moveTo( x + wh, y + h );
+		path.lineTo( x, y + (h - wh) );
+		path.lineTo( x, y + arc );
+		path.quadTo( x, y, x + arc, y );
+		path.lineTo( x + (w - arc), y );
+		path.quadTo( x + w, y, x + w, y + arc );
+		path.lineTo( x + w, y + (h - wh) );
+		path.closePath();
+
+		return path;
+	}
+
 	public static Color stateColor( JSlider slider, boolean hover, boolean pressed,
 		Color enabledColor, Color disabledColor, Color focusedColor, Color hoverColor, Color pressedColor )
 	{

flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatDarkLaf.properties

@@ -237,9 +237,11 @@ Separator.foreground=#515151
 
 #---- Slider ----
 
+Slider.trackValueColor=#4A88C7
 Slider.trackColor=#646464
-Slider.thumbColor=#A6A6A6
+Slider.thumbColor=$Slider.trackValueColor
 Slider.tickColor=#888
+Slider.focusedColor=rgba($Component.focusColor,80%)
 Slider.hoverThumbColor=darken($Slider.thumbColor,10%,derived)
 Slider.pressedThumbColor=darken($Slider.thumbColor,15%,derived)
 Slider.disabledTrackColor=#4c5052

flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatLaf.properties

@@ -506,8 +506,9 @@ Separator.stripeIndent=1
 #---- Slider ----
 
 Slider.focusInsets=0,0,0,0
-Slider.trackWidth=3
-Slider.thumbWidth=11
+Slider.trackWidth=2
+Slider.thumbWidth=12
+Slider.focusWidth=4
 
 
 #---- Spinner ----

flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatLightLaf.properties

@@ -249,9 +249,11 @@ Separator.foreground=#d1d1d1
 
 #---- Slider ----
 
+Slider.trackValueColor=#1E82E6
 Slider.trackColor=#c4c4c4
-Slider.thumbColor=#6e6e6e
+Slider.thumbColor=$Slider.trackValueColor
 Slider.tickColor=#888
+Slider.focusedColor=rgba($Component.focusColor,50%)
 Slider.hoverThumbColor=lighten($Slider.thumbColor,10%,derived)
 Slider.pressedThumbColor=lighten($Slider.thumbColor,15%,derived)
 Slider.disabledTrackColor=#c0c0c0

flatlaf-jide-oss/src/main/java/com/formdev/flatlaf/jideoss/ui/FlatRangeSliderUI.java

@@ -43,18 +43,21 @@ public class FlatRangeSliderUI
 {
 	protected int trackWidth;
 	protected int thumbWidth;
+	protected int focusWidth;
 
+	protected Color trackValueColor;
 	protected Color trackColor;
 	protected Color thumbColor;
-	protected Color focusColor;
+	protected Color thumbBorderColor;
+	protected Color focusedColor;
+	protected Color focusedThumbBorderColor;
 	protected Color hoverTrackColor;
 	protected Color hoverThumbColor;
 	protected Color pressedTrackColor;
 	protected Color pressedThumbColor;
 	protected Color disabledTrackColor;
 	protected Color disabledThumbColor;
-
-	private Rectangle firstThumbRect;
+	protected Color disabledThumbBorderColor;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatRangeSliderUI();
@@ -102,31 +105,40 @@ public class FlatRangeSliderUI
 
 		trackWidth = UIManager.getInt( "Slider.trackWidth" );
 		thumbWidth = UIManager.getInt( "Slider.thumbWidth" );
+		focusWidth = FlatUIUtils.getUIInt( "Slider.focusWidth", 4 );
 
+		trackValueColor = FlatUIUtils.getUIColor( "Slider.trackValueColor", "Slider.thumbColor" );
 		trackColor = UIManager.getColor( "Slider.trackColor" );
 		thumbColor = UIManager.getColor( "Slider.thumbColor" );
-		focusColor = FlatUIUtils.getUIColor( "Slider.focusedColor", "Component.focusColor" );
+		thumbBorderColor = UIManager.getColor( "Slider.thumbBorderColor" );
+		focusedColor = FlatUIUtils.getUIColor( "Slider.focusedColor", "Component.focusColor" );
+		focusedThumbBorderColor = FlatUIUtils.getUIColor( "Slider.focusedThumbBorderColor", "Component.focusedBorderColor" );
 		hoverTrackColor = FlatUIUtils.getUIColor( "Slider.hoverTrackColor", "Slider.hoverThumbColor" );
 		hoverThumbColor = UIManager.getColor( "Slider.hoverThumbColor" );
 		pressedTrackColor = FlatUIUtils.getUIColor( "Slider.pressedTrackColor", "Slider.pressedThumbColor" );
 		pressedThumbColor = UIManager.getColor( "Slider.pressedThumbColor" );
 		disabledTrackColor = UIManager.getColor( "Slider.disabledTrackColor" );
 		disabledThumbColor = UIManager.getColor( "Slider.disabledThumbColor" );
+		disabledThumbBorderColor = FlatUIUtils.getUIColor( "Slider.disabledThumbBorderColor", "Component.disabledBorderColor" );
 	}
 
 	@Override
 	protected void uninstallDefaults( JSlider slider ) {
 		super.uninstallDefaults( slider );
 
+		trackValueColor = null;
 		trackColor = null;
 		thumbColor = null;
-		focusColor = null;
+		thumbBorderColor = null;
+		focusedColor = null;
+		focusedThumbBorderColor = null;
 		hoverTrackColor = null;
 		hoverThumbColor = null;
 		pressedTrackColor = null;
 		pressedThumbColor = null;
 		disabledTrackColor = null;
 		disabledThumbColor = null;
+		disabledThumbBorderColor = null;
 	}
 
 	@Override
@@ -156,7 +168,9 @@ public class FlatRangeSliderUI
 
 	@Override
 	protected Dimension getThumbSize() {
-		return new Dimension( UIScale.scale( thumbWidth ), UIScale.scale( thumbWidth ) );
+		int fw = UIScale.scale( focusWidth );
+		int w = UIScale.scale( thumbWidth ) + fw + fw;
+		return new Dimension( w, w );
 	}
 
 	@Override
@@ -233,9 +247,9 @@ debug*/
 			boolean trackPressed = pressed1 && pressed2;
 
 			Color color = FlatSliderUI.stateColor( slider, trackHover, trackPressed,
-				thumbColor, null, null, hoverTrackColor, pressedTrackColor );
+				trackValueColor, null, null, hoverTrackColor, pressedTrackColor );
 
-			g.setColor( FlatUIUtils.deriveColor( color, thumbColor ) );
+			g.setColor( FlatUIUtils.deriveColor( color, trackValueColor ) );
 			((Graphics2D)g).fill( coloredTrack );
 		}
 	}
@@ -246,10 +260,14 @@ debug*/
 		boolean thumbPressed = (!second && pressed1) || (second && pressed2);
 
 		Color color = FlatSliderUI.stateColor( slider, thumbHover, thumbPressed,
-			thumbColor, disabledThumbColor, focusColor, hoverThumbColor, pressedThumbColor );
+			thumbColor, disabledThumbColor, null, hoverThumbColor, pressedThumbColor );
 		color = FlatUIUtils.deriveColor( color, thumbColor );
 
-		FlatSliderUI.paintThumb( g, slider, thumbRect, isRoundThumb(), color );
+		Color borderColor = (thumbBorderColor != null)
+			? FlatSliderUI.stateColor( slider, false, false, thumbBorderColor, disabledThumbBorderColor, focusedThumbBorderColor, null, null )
+			: null;
+
+		FlatSliderUI.paintThumb( g, slider, thumbRect, isRoundThumb(), color, borderColor, focusedColor, focusWidth );
 	}
 
 	protected boolean isRoundThumb() {

flatlaf-testing/dumps/uidefaults/FlatDarkLaf_1.8.0_202.txt

@@ -845,21 +845,24 @@ Slider.disabledThumbColor      #4c5052    javax.swing.plaf.ColorUIResource [UI]
 Slider.disabledTrackColor      #4c5052    javax.swing.plaf.ColorUIResource [UI]
 Slider.focus                   #7e7e7e    javax.swing.plaf.ColorUIResource [UI]
 Slider.focusInsets             0,0,0,0    javax.swing.plaf.InsetsUIResource [UI]
+Slider.focusWidth              4
+Slider.focusedColor            #cc3d6185    javax.swing.plaf.ColorUIResource [UI]
 Slider.font                    [active] $defaultFont [UI]
 Slider.foreground              #bbbbbb    javax.swing.plaf.ColorUIResource [UI]
 Slider.highlight               #242424    javax.swing.plaf.ColorUIResource [UI]
 Slider.horizontalSize          200,21    java.awt.Dimension
-Slider.hoverThumbColor         #8d8d8d    com.formdev.flatlaf.util.DerivedColor [UI]    darken(10% autoInverse)
+Slider.hoverThumbColor         #346faa    com.formdev.flatlaf.util.DerivedColor [UI]    darken(10% autoInverse)
 Slider.minimumHorizontalSize   36,21    java.awt.Dimension
 Slider.minimumVerticalSize     21,36    java.awt.Dimension
 Slider.onlyLeftMouseButtonDrag true
-Slider.pressedThumbColor       #808080    com.formdev.flatlaf.util.DerivedColor [UI]    darken(15% autoInverse)
+Slider.pressedThumbColor       #2e6296    com.formdev.flatlaf.util.DerivedColor [UI]    darken(15% autoInverse)
 Slider.shadow                  #646464    javax.swing.plaf.ColorUIResource [UI]
-Slider.thumbColor              #a6a6a6    javax.swing.plaf.ColorUIResource [UI]
-Slider.thumbWidth              11
+Slider.thumbColor              #4a88c7    javax.swing.plaf.ColorUIResource [UI]
+Slider.thumbWidth              12
 Slider.tickColor               #888888    javax.swing.plaf.ColorUIResource [UI]
 Slider.trackColor              #646464    javax.swing.plaf.ColorUIResource [UI]
-Slider.trackWidth              3
+Slider.trackValueColor         #4a88c7    javax.swing.plaf.ColorUIResource [UI]
+Slider.trackWidth              2
 Slider.verticalSize            21,200    java.awt.Dimension
 SliderUI                       com.formdev.flatlaf.ui.FlatSliderUI
 

flatlaf-testing/dumps/uidefaults/FlatLightLaf_1.8.0_202.txt

@@ -850,21 +850,24 @@ Slider.disabledThumbColor      #c0c0c0    javax.swing.plaf.ColorUIResource [UI]
 Slider.disabledTrackColor      #c0c0c0    javax.swing.plaf.ColorUIResource [UI]
 Slider.focus                   #9e9e9e    javax.swing.plaf.ColorUIResource [UI]
 Slider.focusInsets             0,0,0,0    javax.swing.plaf.InsetsUIResource [UI]
+Slider.focusWidth              4
+Slider.focusedColor            #7f97c3f3    javax.swing.plaf.ColorUIResource [UI]
 Slider.font                    [active] $defaultFont [UI]
 Slider.foreground              #000000    javax.swing.plaf.ColorUIResource [UI]
 Slider.highlight               #ffffff    javax.swing.plaf.ColorUIResource [UI]
 Slider.horizontalSize          200,21    java.awt.Dimension
-Slider.hoverThumbColor         #888888    com.formdev.flatlaf.util.DerivedColor [UI]    lighten(10% autoInverse)
+Slider.hoverThumbColor         #1569bc    com.formdev.flatlaf.util.DerivedColor [UI]    lighten(10% autoInverse)
 Slider.minimumHorizontalSize   36,21    java.awt.Dimension
 Slider.minimumVerticalSize     21,36    java.awt.Dimension
 Slider.onlyLeftMouseButtonDrag true
-Slider.pressedThumbColor       #949494    com.formdev.flatlaf.util.DerivedColor [UI]    lighten(15% autoInverse)
+Slider.pressedThumbColor       #125ca5    com.formdev.flatlaf.util.DerivedColor [UI]    lighten(15% autoInverse)
 Slider.shadow                  #c4c4c4    javax.swing.plaf.ColorUIResource [UI]
-Slider.thumbColor              #6e6e6e    javax.swing.plaf.ColorUIResource [UI]
-Slider.thumbWidth              11
+Slider.thumbColor              #1e82e6    javax.swing.plaf.ColorUIResource [UI]
+Slider.thumbWidth              12
 Slider.tickColor               #888888    javax.swing.plaf.ColorUIResource [UI]
 Slider.trackColor              #c4c4c4    javax.swing.plaf.ColorUIResource [UI]
-Slider.trackWidth              3
+Slider.trackValueColor         #1e82e6    javax.swing.plaf.ColorUIResource [UI]
+Slider.trackWidth              2
 Slider.verticalSize            21,200    java.awt.Dimension
 SliderUI                       com.formdev.flatlaf.ui.FlatSliderUI
 

flatlaf-testing/dumps/uidefaults/FlatTestLaf_1.8.0_202.txt

@@ -837,6 +837,7 @@ Slider.disabledThumbColor      #888800    javax.swing.plaf.ColorUIResource [UI]
 Slider.disabledTrackColor      #ffff88    javax.swing.plaf.ColorUIResource [UI]
 Slider.focus                   #696969    javax.swing.plaf.ColorUIResource [UI]
 Slider.focusInsets             0,0,0,0    javax.swing.plaf.InsetsUIResource [UI]
+Slider.focusWidth              4
 Slider.focusedColor            #97c3f3    javax.swing.plaf.ColorUIResource [UI]
 Slider.font                    [active] $defaultFont [UI]
 Slider.foreground              #ff0000    javax.swing.plaf.ColorUIResource [UI]
@@ -850,11 +851,12 @@ Slider.onlyLeftMouseButtonDrag true
 Slider.pressedThumbColor       #00ff00    javax.swing.plaf.ColorUIResource [UI]
 Slider.pressedTrackColor       #88ff88    javax.swing.plaf.ColorUIResource [UI]
 Slider.shadow                  #a0a0a0    javax.swing.plaf.ColorUIResource [UI]
-Slider.thumbColor              #880000    javax.swing.plaf.ColorUIResource [UI]
-Slider.thumbWidth              11
+Slider.thumbBorderColor        #ff0000    javax.swing.plaf.ColorUIResource [UI]
+Slider.thumbColor              #ffaaaa    javax.swing.plaf.ColorUIResource [UI]
+Slider.thumbWidth              12
 Slider.tickColor               #ff0000    javax.swing.plaf.ColorUIResource [UI]
-Slider.trackColor              #00bb00    javax.swing.plaf.ColorUIResource [UI]
-Slider.trackWidth              3
+Slider.trackColor              #88ff88    javax.swing.plaf.ColorUIResource [UI]
+Slider.trackWidth              2
 Slider.verticalSize            21,200    java.awt.Dimension
 SliderUI                       com.formdev.flatlaf.ui.FlatSliderUI
 

flatlaf-testing/src/main/resources/com/formdev/flatlaf/testing/FlatTestLaf.properties

@@ -257,8 +257,9 @@ Separator.stripeIndent=5
 
 #---- Slider ----
 
-Slider.trackColor=#0b0
-Slider.thumbColor=#800
+Slider.trackColor=#8f8
+Slider.thumbColor=#faa
+Slider.thumbBorderColor=#f00
 Slider.tickColor=#f00
 Slider.focusedColor=$Component.focusColor
 Slider.hoverThumbColor=#00f

flatlaf-theme-editor/src/main/resources/com/formdev/flatlaf/themeeditor/FlatLafUIKeys.txt

@@ -587,6 +587,8 @@ Slider.focus
 Slider.focusInputMap
 Slider.focusInputMap.RightToLeft
 Slider.focusInsets
+Slider.focusWidth
+Slider.focusedColor
 Slider.font
 Slider.foreground
 Slider.highlight
@@ -601,6 +603,7 @@ Slider.thumbColor
 Slider.thumbWidth
 Slider.tickColor
 Slider.trackColor
+Slider.trackValueColor
 Slider.trackWidth
 Slider.verticalSize
 SliderUI