/* * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *   - Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. * *   - Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. * *   - Neither the name of Sun Microsystems nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package components;import javax.swing.*;import java.awt.*;import java.awt.event.ItemEvent;import java.awt.event.ItemListener;import java.awt.event.MouseEvent;import javax.swing.event.MouseInputAdapter;/** An 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 basic implementation of redispatching events.    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();        }    }}