Mega Code Archive
WindowListener, WindowFocusListener, WindowStateListener
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/*
* 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.
*/
/*
* WindowEventDemo
*/
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowFocusListener;
import java.awt.event.WindowListener;
import java.awt.event.WindowStateListener;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class WindowEventDemo extends JFrame implements WindowListener,
WindowFocusListener, WindowStateListener {
static final String newline = System.getProperty("line.separator");
static final String space = " ";
static WindowEventDemo frame = new WindowEventDemo("WindowEventDemo");
JTextArea display;
public static void main(String[] args) {
/* Use an appropriate Look and Feel */
try {
// UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
// UIManager.setLookAndFeel("com.sun.java.swing.plaf.gtk.GTKLookAndFeel");
UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
} catch (UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
} catch (IllegalAccessException ex) {
ex.printStackTrace();
} catch (InstantiationException ex) {
ex.printStackTrace();
} catch (ClassNotFoundException ex) {
ex.printStackTrace();
}
/* Turn off metal's use of bold fonts */
UIManager.put("swing.boldMetal", Boolean.FALSE);
// Schedule a job for the event dispatch thread:
// creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
/**
* 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.
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
// Set up the content pane.
frame.addComponentsToPane();
// Display the window.
frame.pack();
frame.setVisible(true);
}
private void addComponentsToPane() {
display = new JTextArea();
display.setEditable(false);
JScrollPane scrollPane = new JScrollPane(display);
scrollPane.setPreferredSize(new Dimension(500, 450));
getContentPane().add(scrollPane, BorderLayout.CENTER);
addWindowListener(this);
addWindowFocusListener(this);
addWindowStateListener(this);
checkWM();
}
public WindowEventDemo(String name) {
super(name);
}
// Some window managers don't support all window states.
public void checkWM() {
Toolkit tk = frame.getToolkit();
if (!(tk.isFrameStateSupported(Frame.ICONIFIED))) {
displayMessage("Your window manager doesn't support ICONIFIED.");
} else
displayMessage("Your window manager supports ICONIFIED.");
if (!(tk.isFrameStateSupported(Frame.MAXIMIZED_VERT))) {
displayMessage("Your window manager doesn't support MAXIMIZED_VERT.");
} else
displayMessage("Your window manager supports MAXIMIZED_VERT.");
if (!(tk.isFrameStateSupported(Frame.MAXIMIZED_HORIZ))) {
displayMessage("Your window manager doesn't support MAXIMIZED_HORIZ.");
} else
displayMessage("Your window manager supports MAXIMIZED_HORIZ.");
if (!(tk.isFrameStateSupported(Frame.MAXIMIZED_BOTH))) {
displayMessage("Your window manager doesn't support MAXIMIZED_BOTH.");
} else {
displayMessage("Your window manager supports MAXIMIZED_BOTH.");
}
}
public void windowClosing(WindowEvent e) {
displayMessage("WindowListener method called: windowClosing.");
// A pause so user can see the message before
// the window actually closes.
ActionListener task = new ActionListener() {
boolean alreadyDisposed = false;
public void actionPerformed(ActionEvent e) {
if (frame.isDisplayable()) {
alreadyDisposed = true;
frame.dispose();
}
}
};
Timer timer = new Timer(500, task); // fire every half second
timer.setInitialDelay(2000); // first delay 2 seconds
timer.setRepeats(false);
timer.start();
}
public void windowClosed(WindowEvent e) {
// This will only be seen on standard output.
displayMessage("WindowListener method called: windowClosed.");
}
public void windowOpened(WindowEvent e) {
displayMessage("WindowListener method called: windowOpened.");
}
public void windowIconified(WindowEvent e) {
displayMessage("WindowListener method called: windowIconified.");
}
public void windowDeiconified(WindowEvent e) {
displayMessage("WindowListener method called: windowDeiconified.");
}
public void windowActivated(WindowEvent e) {
displayMessage("WindowListener method called: windowActivated.");
}
public void windowDeactivated(WindowEvent e) {
displayMessage("WindowListener method called: windowDeactivated.");
}
public void windowGainedFocus(WindowEvent e) {
displayMessage("WindowFocusListener method called: windowGainedFocus.");
}
public void windowLostFocus(WindowEvent e) {
displayMessage("WindowFocusListener method called: windowLostFocus.");
}
public void windowStateChanged(WindowEvent e) {
displayStateMessage(
"WindowStateListener method called: windowStateChanged.", e);
}
private void displayMessage(String msg) {
display.append(msg + newline);
System.out.println(msg);
}
private void displayStateMessage(String prefix, WindowEvent e) {
int state = e.getNewState();
int oldState = e.getOldState();
String msg = prefix + newline + space + "New state: "
+ convertStateToString(state) + newline + space + "Old state: "
+ convertStateToString(oldState);
displayMessage(msg);
}
private String convertStateToString(int state) {
if (state == Frame.NORMAL) {
return "NORMAL";
}
String strState = " ";
if ((state & Frame.ICONIFIED) != 0) {
strState += "ICONIFIED";
}
// MAXIMIZED_BOTH is a concatenation of two bits, so
// we need to test for an exact match.
if ((state & Frame.MAXIMIZED_BOTH) == Frame.MAXIMIZED_BOTH) {
strState += "MAXIMIZED_BOTH";
} else {
if ((state & Frame.MAXIMIZED_VERT) != 0) {
strState += "MAXIMIZED_VERT";
}
if ((state & Frame.MAXIMIZED_HORIZ) != 0) {
strState += "MAXIMIZED_HORIZ";
}
}
if (" ".equals(strState)) {
strState = "UNKNOWN";
}
return strState.trim();
}
}
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