/* * 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 events;/* * Swing version */import javax.swing.*;import java.awt.GridBagLayout;import java.awt.GridBagConstraints;import java.awt.Insets;import java.awt.Dimension;import java.awt.Color;import java.awt.event.ActionListener;import java.awt.event.ActionEvent;public class MultiListener extends JPanel                            implements ActionListener {    JTextArea topTextArea;    JTextArea bottomTextArea;    JButton button1, button2;    final static String newline = "\n";    public MultiListener() {        super(new GridBagLayout());        GridBagLayout gridbag = (GridBagLayout)getLayout();        GridBagConstraints c = new GridBagConstraints();        JLabel l = null;        c.fill = GridBagConstraints.BOTH;        c.gridwidth = GridBagConstraints.REMAINDER;        l = new JLabel("What MultiListener hears:");        gridbag.setConstraints(l, c);        add(l);        c.weighty = 1.0;        topTextArea = new JTextArea();        topTextArea.setEditable(false);        JScrollPane topScrollPane = new JScrollPane(topTextArea);        Dimension preferredSize = new Dimension(200, 75);        topScrollPane.setPreferredSize(preferredSize);        gridbag.setConstraints(topScrollPane, c);        add(topScrollPane);        c.weightx = 0.0;        c.weighty = 0.0;        l = new JLabel("What Eavesdropper hears:");        gridbag.setConstraints(l, c);        add(l);        c.weighty = 1.0;        bottomTextArea = new JTextArea();        bottomTextArea.setEditable(false);        JScrollPane bottomScrollPane = new JScrollPane(bottomTextArea);        bottomScrollPane.setPreferredSize(preferredSize);        gridbag.setConstraints(bottomScrollPane, c);        add(bottomScrollPane);        c.weightx = 1.0;        c.weighty = 0.0;        c.gridwidth = 1;        c.insets = new Insets(10, 10, 0, 10);        button1 = new JButton("Blah blah blah");        gridbag.setConstraints(button1, c);        add(button1);        c.gridwidth = GridBagConstraints.REMAINDER;        button2 = new JButton("You don't say!");        gridbag.setConstraints(button2, c);        add(button2);        button1.addActionListener(this);        button2.addActionListener(this);        button2.addActionListener(new Eavesdropper(bottomTextArea));        setPreferredSize(new Dimension(450, 450));        setBorder(BorderFactory.createCompoundBorder(                                BorderFactory.createMatteBorder(                                                1,1,2,2,Color.black),                                BorderFactory.createEmptyBorder(5,5,5,5)));    }    public void actionPerformed(ActionEvent e) {        topTextArea.append(e.getActionCommand() + newline);        topTextArea.setCaretPosition(topTextArea.getDocument().getLength());    }    /**     * 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("MultiListener");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //Create and set up the content pane.        JComponent newContentPane = new MultiListener();        newContentPane.setOpaque(true); //content panes must be opaque        frame.setContentPane(newContentPane);        //Display 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();            }        });    }}class Eavesdropper implements ActionListener {    JTextArea myTextArea;    public Eavesdropper(JTextArea ta) {        myTextArea = ta;    }    public void actionPerformed(ActionEvent e) {        myTextArea.append(e.getActionCommand()                        + MultiListener.newline);        myTextArea.setCaretPosition(myTextArea.getDocument().getLength());    }}