- ScrollBar: show "pressed" feedback on track/thumb only for left mouse button; if absolute positioning is enabled (the default), then also for middle mouse button

- Arrow buttons in ComboBox, Spinner, ScrollBar and TabbedPane: show "pressed" feedback only for left mouse button

CHANGELOG.md

@@ -8,6 +8,11 @@ FlatLaf Change Log
 - ComboBox and Spinner: Fixed missing arrow buttons if preferred height is zero.
   Minimum width of arrow buttons is 3/4 of default width.
 - TabbedPane: Switch and close tabs on left mouse click only. (PR #595)
+- ScrollBar: Show "pressed" feedback on track/thumb only for left mouse button.
+  If absolute positioning is enabled (the default), then also for middle mouse
+  button.
+- Arrow buttons in ComboBox, Spinner, ScrollBar and TabbedPane: Show "pressed"
+  feedback only for left mouse button.
 
 
 ## 2.5

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

@@ -25,6 +25,7 @@ import java.awt.Graphics2D;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import javax.swing.JComponent;
+import javax.swing.SwingUtilities;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicArrowButton;
 
@@ -82,15 +83,19 @@ public class FlatArrowButton
 
 				@Override
 				public void mousePressed( MouseEvent e ) {
+					if( SwingUtilities.isLeftMouseButton( e ) ) {
 						pressed = true;
 						repaint();
 					}
+				}
 
 				@Override
 				public void mouseReleased( MouseEvent e ) {
+					if( SwingUtilities.isLeftMouseButton( e ) ) {
 						pressed = false;
 						repaint();
 					}
+				}
 			} );
 		}
 	}

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

@@ -352,6 +352,9 @@ public class FlatScrollBarUI
 
 	@Override
 	protected void paintTrack( Graphics g, JComponent c, Rectangle trackBounds ) {
+		if( trackBounds.isEmpty() || !scrollbar.isEnabled() )
+			return;
+
 		g.setColor( getTrackColor( c, hoverTrack, isPressed && hoverTrack && !hoverThumb ) );
 		paintTrackOrThumb( g, c, trackBounds, trackInsets, trackArc );
 	}
@@ -452,18 +455,31 @@ public class FlatScrollBarUI
 
 		@Override
 		public void mousePressed( MouseEvent e ) {
+			if( SwingUtilities.isLeftMouseButton( e ) || isAbsolutePositioning( e ) ) {
 				isPressed = true;
 				repaint();
+
+				// update hover because BasicScrollBarUI.TrackListener.mousePressed()
+				// moves the track on middle-click (if absolute positioning is enabled)
+				if( isAbsolutePositioning( e ) )
+					update( e.getX(), e.getY() );
+			}
 		}
 
 		@Override
 		public void mouseReleased( MouseEvent e ) {
+			if( SwingUtilities.isLeftMouseButton( e ) || isAbsolutePositioning( e ) ) {
 				isPressed = false;
 				repaint();
+			}
 
 			update( e.getX(), e.getY() );
 		}
 
+		private boolean isAbsolutePositioning( MouseEvent e ) {
+			return getSupportsAbsolutePositioning() && SwingUtilities.isMiddleMouseButton( e );
+		}
+
 		private void update( int x, int y ) {
 			boolean inTrack = getTrackBounds().contains( x, y );
 			boolean inThumb = getThumbBounds().contains( x, y );