src/dev/kske/chess/ui/GameTabComponent.java

@@ -1,11 +1,20 @@
 package dev.kske.chess.ui;
 
+import java.awt.BasicStroke;
+import java.awt.Color;
+import java.awt.Dimension;
 import java.awt.FlowLayout;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
 
+import javax.swing.BorderFactory;
 import javax.swing.JButton;
 import javax.swing.JLabel;
 import javax.swing.JPanel;
 import javax.swing.JTabbedPane;
+import javax.swing.plaf.basic.BasicButtonUI;
 
 /**
  * Project: <strong>Chess</strong><br>
@@ -16,14 +25,17 @@ import javax.swing.JTabbedPane;
  */
 public class GameTabComponent extends JPanel {
 
+	private final JTabbedPane tabbedPane;
+
 	private static final long serialVersionUID = 9022979950018125935L;
 
 	public GameTabComponent(JTabbedPane tabbedPane) {
 		super(new FlowLayout(FlowLayout.LEFT, 0, 0));
 		if (tabbedPane == null) throw new NullPointerException("TabbedPane is null");
+		this.tabbedPane = tabbedPane;
 
 		// Create title JLabel
-		add(new JLabel() {
+		JLabel label = new JLabel() {
 
 			private static final long serialVersionUID = 7902391411509551586L;
 
@@ -32,13 +44,56 @@ public class GameTabComponent extends JPanel {
 				int i = tabbedPane.indexOfTabComponent(GameTabComponent.this);
 				return i != -1 ? tabbedPane.getTitleAt(i) : "";
 			}
-		});
+		};
+		label.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 5));
+		add(label);
 
-		JButton btnClose = new JButton("Close");
-		btnClose.addActionListener((evt) -> {
-			int i = tabbedPane.indexOfTabComponent(GameTabComponent.this);
-			if (i != -1) tabbedPane.remove(i);
-		});
-		add(btnClose);
+		// Create close JButton
+		add(new TabButton());
+		setBorder(BorderFactory.createEmptyBorder(2, 0, 0, 0));
+	}
+
+	private class TabButton extends JButton {
+
+		private static final long serialVersionUID = -2757857832337636731L;
+
+		public TabButton() {
+			final int size = 17;
+			setPreferredSize(new Dimension(size, size));
+			setToolTipText("Close this tab");
+			setUI(new BasicButtonUI());
+			setContentAreaFilled(false);
+			setFocusable(false);
+			setBorder(BorderFactory.createEtchedBorder());
+			setBorderPainted(false);
+			addMouseListener(new MouseAdapter() {
+
+				@Override
+				public void mouseEntered(MouseEvent evt) { setBorderPainted(true); }
+
+				@Override
+				public void mouseExited(MouseEvent evt) { setBorderPainted(false); }
+			});
+			setRolloverEnabled(true);
+			addActionListener((evt) -> { int i = tabbedPane.indexOfTabComponent(GameTabComponent.this); if (i != -1) tabbedPane.remove(i); });
+		}
+
+		@Override
+		public void updateUI() {}
+
+		@Override
+		public void paintComponent(Graphics g) {
+			super.paintComponent(g);
+			Graphics2D g2 = (Graphics2D) g.create();
+			// shift the image for pressed buttons
+			if (getModel().isPressed()) { g2.translate(1, 1); }
+			g2.setStroke(new BasicStroke(2));
+			g2.setColor(Color.BLACK);
+			if (getModel().isRollover()) { g2.setColor(Color.MAGENTA); }
+			final int delta = 6;
+			g2.drawLine(delta, delta, getWidth() - delta - 1, getHeight() - delta - 1);
+			g2.drawLine(getWidth() - delta - 1, delta, delta, getHeight() - delta - 1);
+			g2.dispose();
+		}
 	}
 }