Uses a subclass of MouseInputAdapter to listen to mouse events and mouse-motion events
on the root pane's glass pane. Redispatches the events to underlying components.
/*
*
* Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
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* which is disparaging to Sun.
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import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.MouseEvent;
import javax.swing.AbstractButton;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.SwingUtilities;
import javax.swing.event.MouseInputAdapter;
/** A 1.4 application that requires no other files. */
public class GlassPaneDemo {
static private MyGlassPane myGlassPane;
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("GlassPaneDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Start creating and adding components.
JCheckBox changeButton = new JCheckBox("Glass pane \"visible\"");
changeButton.setSelected(false);
// Set up the content pane, where the "main GUI" lives.
Container contentPane = frame.getContentPane();
contentPane.setLayout(new FlowLayout());
contentPane.add(changeButton);
contentPane.add(new JButton("Button 1"));
contentPane.add(new JButton("Button 2"));
// Set up the menu bar, which appears above the content pane.
JMenuBar menuBar = new JMenuBar();
JMenu menu = new JMenu("Menu");
menu.add(new JMenuItem("Do nothing"));
menuBar.add(menu);
frame.setJMenuBar(menuBar);
// Set up the glass pane, which appears over both menu bar
// and content pane and is an item listener on the change
// button.
myGlassPane = new MyGlassPane(changeButton, menuBar, frame.getContentPane());
changeButton.addItemListener(myGlassPane);
frame.setGlassPane(myGlassPane);
// Show the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
// Schedule a job for the event-dispatching thread:
// creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
/**
* We have to provide our own glass pane so that it can paint.
*/
class MyGlassPane extends JComponent implements ItemListener {
Point point;
// React to change button clicks.
public void itemStateChanged(ItemEvent e) {
setVisible(e.getStateChange() == ItemEvent.SELECTED);
}
protected void paintComponent(Graphics g) {
if (point != null) {
g.setColor(Color.red);
g.fillOval(point.x - 10, point.y - 10, 20, 20);
}
}
public void setPoint(Point p) {
point = p;
}
public MyGlassPane(AbstractButton aButton, JMenuBar menuBar, Container contentPane) {
CBListener listener = new CBListener(aButton, menuBar, this, contentPane);
addMouseListener(listener);
addMouseMotionListener(listener);
}
}
/**
* Listen for all events that our check box is likely to be interested in.
* Redispatch them to the check box.
*/
class CBListener extends MouseInputAdapter {
Toolkit toolkit;
Component liveButton;
JMenuBar menuBar;
MyGlassPane glassPane;
Container contentPane;
public CBListener(Component liveButton, JMenuBar menuBar, MyGlassPane glassPane,
Container contentPane) {
toolkit = Toolkit.getDefaultToolkit();
this.liveButton = liveButton;
this.menuBar = menuBar;
this.glassPane = glassPane;
this.contentPane = contentPane;
}
public void mouseMoved(MouseEvent e) {
redispatchMouseEvent(e, false);
}
public void mouseDragged(MouseEvent e) {
redispatchMouseEvent(e, false);
}
public void mouseClicked(MouseEvent e) {
redispatchMouseEvent(e, false);
}
public void mouseEntered(MouseEvent e) {
redispatchMouseEvent(e, false);
}
public void mouseExited(MouseEvent e) {
redispatchMouseEvent(e, false);
}
public void mousePressed(MouseEvent e) {
redispatchMouseEvent(e, false);
}
public void mouseReleased(MouseEvent e) {
redispatchMouseEvent(e, true);
}
// A more finished version of this method would
// handle mouse-dragged events specially.
private void redispatchMouseEvent(MouseEvent e, boolean repaint) {
Point glassPanePoint = e.getPoint();
Container container = contentPane;
Point containerPoint = SwingUtilities.convertPoint(glassPane, glassPanePoint, contentPane);
if (containerPoint.y < 0) { // we're not in the content pane
if (containerPoint.y + menuBar.getHeight() >= 0) {
// The mouse event is over the menu bar.
// Could handle specially.
} else {
// The mouse event is over non-system window
// decorations, such as the ones provided by
// the Java look and feel.
// Could handle specially.
}
} else {
// The mouse event is probably over the content pane.
// Find out exactly which component it's over.
Component component = SwingUtilities.getDeepestComponentAt(container, containerPoint.x,
containerPoint.y);
if ((component != null) && (component.equals(liveButton))) {
// Forward events over the check box.
Point componentPoint = SwingUtilities.convertPoint(glassPane, glassPanePoint, component);
component.dispatchEvent(new MouseEvent(component, e.getID(), e.getWhen(), e.getModifiers(),
componentPoint.x, componentPoint.y, e.getClickCount(), e.isPopupTrigger()));
}
}
// Update the glass pane if requested.
if (repaint) {
glassPane.setPoint(glassPanePoint);
glassPane.repaint();
}
}
}
