Provide visual padding hints for slider.

core/src/main/java/com/github/weisj/darklaf/ui/VisualPaddingProvider.java

@@ -39,7 +39,14 @@ public interface VisualPaddingProvider {
     static void updateProperty(final JComponent c) {
         Border b = DarkUIUtil.getUnwrappedBorder(c);
         if (b instanceof VisualPaddingProvider) {
-            Insets ins = ((VisualPaddingProvider) b).getVisualPaddings(c);
+            updateProperty(c, ((VisualPaddingProvider) b).getVisualPaddings(c));
+        } else {
+            updateProperty(c, null);
+        }
+    }
+
+    static void updateProperty(final JComponent c, final Insets ins) {
+        if (ins != null) {
             PropertyUtil.installProperty(c, VISUAL_PADDING_PROP,
                     new InsetsUIResource(ins.top, ins.left, ins.bottom, ins.right));
         } else {

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

@@ -29,6 +29,8 @@ import java.beans.PropertyChangeListener;
 
 import javax.swing.*;
 
+import com.github.weisj.darklaf.util.PropertyKey;
+
 public class DarkSliderListener extends MouseAdapter implements PropertyChangeListener {
 
     private final DarkSliderUI ui;
@@ -73,10 +75,11 @@ public class DarkSliderListener extends MouseAdapter implements PropertyChangeLi
     @Override
     public void propertyChange(final PropertyChangeEvent evt) {
         String key = evt.getPropertyName();
-        if (DarkSliderUI.KEY_VARIANT.equals(key)) {
+        if (DarkSliderUI.KEY_VARIANT.equals(key)
-            slider.repaint();
+                || DarkSliderUI.KEY_SHOW_VOLUME_ICON.equals(key)
-        } else if (DarkSliderUI.KEY_SHOW_VOLUME_ICON.equals(key)) {
+                || PropertyKey.ORIENTATION.equals(key)
-            ui.calculateGeometry();
+                || PropertyKey.COMPONENT_ORIENTATION.equals(key)) {
+            ui.updateVisualPaddings();
             slider.repaint();
         }
     }

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

@@ -35,6 +35,7 @@ import com.github.weisj.darklaf.graphics.GraphicsContext;
 import com.github.weisj.darklaf.graphics.GraphicsUtil;
 import com.github.weisj.darklaf.graphics.PaintUtil;
 import com.github.weisj.darklaf.icons.RotatableIcon;
+import com.github.weisj.darklaf.ui.VisualPaddingProvider;
 import com.github.weisj.darklaf.util.Alignment;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.PropertyKey;
@@ -114,6 +115,12 @@ public class DarkSliderUI extends BasicSliderUI {
         return PropertyUtil.isPropertyEqual(c, KEY_VARIANT, VARIANT_VOLUME);
     }
 
+    @Override
+    public void installUI(final JComponent c) {
+        super.installUI(c);
+        updateVisualPaddings();
+    }
+
     @Override
     protected TrackListener createTrackListener(final JSlider slider) {
         return new SnapTrackListener();
@@ -134,6 +141,13 @@ public class DarkSliderUI extends BasicSliderUI {
         return new DarkSliderListener(this, slider);
     }
 
+    protected void updateVisualPaddings() {
+        calculateGeometry();
+        Rectangle r = new Rectangle(contentRect);
+        Insets ins = new Insets(r.y, r.x, slider.getHeight() - (r.y + r.height), slider.getWidth() - (r.x + r.width));
+        VisualPaddingProvider.updateProperty(slider, ins);
+    }
+
     @Override
     protected void uninstallListeners(final JSlider slider) {
         super.uninstallListeners(slider);