TabbedPane: scroll button implemented; do not hover tab if it is disabled

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

@@ -18,18 +18,25 @@ package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Color;
+import java.awt.Dimension;
 import java.awt.Font;
 import java.awt.FontMetrics;
 import java.awt.Graphics;
+import java.awt.Graphics2D;
 import java.awt.Insets;
 import java.awt.Rectangle;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.awt.geom.Path2D;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
+import javax.swing.JButton;
 import javax.swing.JComponent;
 import javax.swing.JTabbedPane;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
+import javax.swing.plaf.basic.BasicArrowButton;
 import javax.swing.plaf.basic.BasicTabbedPaneUI;
 import javax.swing.text.View;
 import sun.swing.SwingUtilities2;
@@ -42,6 +49,7 @@ import sun.swing.SwingUtilities2;
  * @uiDefault TabbedPane.font							Font
  * @uiDefault TabbedPane.background						Color
  * @uiDefault TabbedPane.foreground						Color
+ * @uiDefault TabbedPane.shadow							Color	used for scroll arrows and cropped line
  * @uiDefault TabbedPane.disabledForeground				Color
  * @uiDefault TabbedPane.selectedForeground				Color
  * @uiDefault TabbedPane.underlineColor					Color
@@ -118,6 +126,11 @@ public class FlatTabbedPaneUI
 		};
 	}
 
+	@Override
+	protected JButton createScrollButton( int direction ) {
+		return new ScrollableTabButton( direction );
+	}
+
 	@Override
 	protected void setRolloverTab( int index ) {
 		int oldIndex = getRolloverTab();
@@ -256,7 +269,7 @@ public class FlatTabbedPaneUI
 
 		// paint tab background
 		boolean enabled = tabPane.isEnabled();
-		g.setColor( enabled && getRolloverTab() == tabIndex
+		g.setColor( enabled && tabPane.isEnabledAt( tabIndex ) && getRolloverTab() == tabIndex
 			? hoverColor
 			: (enabled && isSelected && tabPane.hasFocus()
 				? focusColor
@@ -327,4 +340,88 @@ public class FlatTabbedPaneUI
 	private boolean isTopOrBottom( int tabPlacement ) {
 		return tabPlacement == TOP || tabPlacement == BOTTOM;
 	}
+
+	//---- class ScrollableTabButton ------------------------------------------
+
+	private class ScrollableTabButton
+		extends BasicArrowButton
+		implements UIResource
+	{
+		private boolean hover;
+
+		public ScrollableTabButton( int direction ) {
+			super( direction, Color.WHITE, Color.WHITE, Color.WHITE, Color.WHITE );
+
+			setOpaque( false );
+			setBorder( null );
+
+			addMouseListener( new MouseAdapter() {
+				@Override
+				public void mouseEntered( MouseEvent e ) {
+					hover = true;
+					repaint();
+				}
+
+				@Override
+				public void mouseExited( MouseEvent e ) {
+					hover = false;
+					repaint();
+				}
+			} );
+		}
+
+		@Override
+		public Dimension getPreferredSize() {
+			return scale( super.getPreferredSize() );
+		}
+
+		@Override
+		public Dimension getMinimumSize() {
+			return scale( super.getMinimumSize() );
+		}
+
+		@Override
+		public void paint( Graphics g ) {
+			Graphics2D g2 = (Graphics2D)g;
+			FlatUIUtils.setRenderingHints( g2 );
+
+			int width = getWidth();
+			int height = getHeight();
+			boolean enabled = isEnabled();
+
+			// paint hover background
+			if( enabled && hover ) {
+				g.setColor( hoverColor );
+				g.fillRect( 0, 0, width, height );
+			}
+
+			int w = scale( 9 );
+			int h = scale( 5 );
+			int x = Math.round( (width - w) / 2f );
+			int y = Math.round( (height - h) / 2f );
+
+			// arrow for SOUTH direction
+			Path2D arrow = new Path2D.Float();
+			arrow.moveTo( x, y );
+			arrow.lineTo( x + w, y );
+			arrow.lineTo( x + (w / 2f), y + h );
+			arrow.closePath();
+
+			// rotate arrow if necessary
+			if( direction == WEST ) {
+				g2.translate( width, 0 );
+				g2.rotate( Math.toRadians( 90 ) );
+			} else if( direction == EAST ) {
+				g2.translate( 0, height );
+				g2.rotate( Math.toRadians( 270 ) );
+			} else if( direction == NORTH ) {
+				g2.translate( width, height );
+				g2.rotate( Math.toRadians( 180 ) );
+			}
+
+			// paint arrow
+			g.setColor( enabled ? shadow : disabledForeground );
+			g2.fill( arrow );
+		}
+	}
 }

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

@@ -135,6 +135,7 @@ TabbedPane.tabAreaInsets=0,0,0,0
 TabbedPane.selectedTabPadInsets=0,0,0,0
 TabbedPane.tabRunOverlay=0
 TabbedPane.tabsOverlapBorder=true
+TabbedPane.shadow=@@ComboBox.buttonArrowColor
 
 
 #---- TextArea ----