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    <p>You want the <code>mouseEntered</code> and <code>mouseExited</code> to be called on full boundaries. This is, as you have noticed, not directly possible with the "normal" <code>MouseListener</code>. </p> <p>The simplest way is to add the listener to all child-components of the panel:</p> <pre><code>private static void addListenerToAllComponents(JComponent c, MouseListener l) { c.addMouseListener(l); for (Component cc : c.getComponents()) if (cc instanceof JComponent) addListenerToAllComponents((JComponent) cc, l); } </code></pre> <p><strong>Full example:</strong></p> <pre><code>public static void main(String[] args) { final JFrame frame = new JFrame("Test"); frame.add(new JLabel("Testing"), BorderLayout.NORTH); final JPanel panel = new JPanel(new GridLayout(2, 1)); panel.setBackground(Color.RED); MouseListener l = new MouseAdapter() { @Override public void mouseEntered(MouseEvent e) { panel.setBackground(Color.BLUE); } @Override public void mouseExited(MouseEvent e) { panel.setBackground(Color.RED); } }; panel.add(new JLabel("Hello")); panel.add(new JTextField("World!")); addListenerToAllComponents(panel, l); frame.add(panel, BorderLayout.CENTER); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(400, 300); frame.setVisible(true); } </code></pre> <hr> <h2>Another workaround (previous answer)...</h2> <p>...is to set a <a href="http://download.oracle.com/javase/tutorial/uiswing/components/rootpane.html#glasspane" rel="nofollow">GlassPane</a> and check bounds yourself:</p> <pre><code>public static void main(String[] args) { JFrame frame = new JFrame("Test"); frame.add(new JLabel("Testing"), BorderLayout.NORTH); final JPanel panel = new JPanel(new GridLayout(2, 1)); frame.add(panel, BorderLayout.CENTER); panel.add(new JLabel("Hello")); panel.add(new JTextField("World!")); class GlassPane extends JComponent { GlassPane(final JComponent c) { addMouseMotionListener(new MouseMotionAdapter() { @Override public void mouseMoved(MouseEvent e) { Point p = SwingUtilities.convertPoint(e.getComponent(), e.getPoint(), c); if (c.contains(p)) c.setBackground(Color.BLUE); else c.setBackground(Color.RED); } }); addMouseListener(new MouseAdapter() { public void mouseExited(MouseEvent e) { c.setBackground(Color.MAGENTA); } }); } } GlassPane glass = new GlassPane(panel); frame.setGlassPane(glass); glass.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(400, 300); frame.setVisible(true); } </code></pre> <hr> <p>There are some stuff you need to look in to... Event redistribution is one and might be a problem in your case. Follow <a href="http://download.oracle.com/javase/tutorial/uiswing/examples/components/GlassPaneDemoProject/src/components/GlassPaneDemo.java" rel="nofollow">this example</a> and implement an event distribution listener on the glass pane:</p> <pre><code>MouseInputListener i = new MouseInputListener() { private void redispatchMouseEvent(MouseEvent e) { Point glassPanePoint = e.getPoint(); Container container = frame.getContentPane(); Point containerPoint = SwingUtilities.convertPoint( GlassPane.this, glassPanePoint, container); Component component = SwingUtilities.getDeepestComponentAt( container, containerPoint.x, containerPoint.y); if (component != null) { Point componentPoint = SwingUtilities.convertPoint( GlassPane.this, glassPanePoint, component); component.dispatchEvent(new MouseEvent(component, e.getID(), e.getWhen(), e.getModifiers(), componentPoint.x, componentPoint.y, e.getClickCount(), e.isPopupTrigger())); } } public void mouseMoved(MouseEvent e) { redispatchMouseEvent(e); } public void mouseDragged(MouseEvent e) { redispatchMouseEvent(e); } public void mouseClicked(MouseEvent e) { redispatchMouseEvent(e); } public void mouseEntered(MouseEvent e) { redispatchMouseEvent(e); } public void mouseExited(MouseEvent e) { redispatchMouseEvent(e); } public void mousePressed(MouseEvent e) { redispatchMouseEvent(e); } public void mouseReleased(MouseEvent e) { redispatchMouseEvent(e); } }; addMouseListener(i); addMouseMotionListener(i); </code></pre>
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    1. POJava: define unit component for mouse events
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    1. COThank you. I saw the demo and yes it works. But it is so complicated and special example. I am looking for a simple way.
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    2. CO@sajad: Added nother example (first) where I add the same listener for all child-components. Is it simple enough?
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