Window Event Demo : Various Event Listener « Event « Java

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Java » Event » Various Event ListenerScreenshots 
Window Event Demo
Window Event Demo
  
/* From http://java.sun.com/docs/books/tutorial/index.html */
/*
 * Copyright (c) 2006 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:
 *
 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *
 * -Redistribution 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, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
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 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that this software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */
/*
 * WindowEventDemo.java is a 1.4 example that requires no other files.
 */

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.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.Timer;

public class WindowEventDemo extends JPanel implements WindowListener,
    WindowFocusListener, WindowStateListener {
  final static String newline = "\n";

  final static String space = "    ";

  static JFrame frame;

  JTextArea display;

  public WindowEventDemo() {
    super(new BorderLayout());
    display = new JTextArea();
    display.setEditable(false);
    JScrollPane scrollPane = new JScrollPane(display);
    scrollPane.setPreferredSize(new Dimension(500450));
    add(scrollPane, BorderLayout.CENTER);

    frame.addWindowListener(this);
    frame.addWindowFocusListener(this);
    frame.addWindowStateListener(this);

    checkWM();
  }

  //Some window managers don't support all window states.
  //For example, dtwm doesn't support true maximization,
  //but mimics it by resizing the window to be the size
  //of the screen. In this case the window does not fire
  //the MAXIMIZED_ constants on the window's state listener.
  //Microsoft Windows supports MAXIMIZED_BOTH, but not
  //MAXIMIZED_VERT or MAXIMIZED_HORIZ.
  public void checkWM() {
    Toolkit tk = frame.getToolkit();
    if (!(tk.isFrameStateSupported(Frame.ICONIFIED))) {
      displayMessage("Your window manager doesn't support ICONIFIED.");
    }
    if (!(tk.isFrameStateSupported(Frame.MAXIMIZED_VERT))) {
      displayMessage("Your window manager doesn't support MAXIMIZED_VERT.");
    }
    if (!(tk.isFrameStateSupported(Frame.MAXIMIZED_HORIZ))) {
      displayMessage("Your window manager doesn't support 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 (!alreadyDisposed) {
          alreadyDisposed = true;
          frame.dispose();
        else //make sure the program exits
          System.exit(0);
        }
      }
    };
    Timer timer = new Timer(500, task)//fire every half second
    timer.setInitialDelay(2000)//first delay 2 seconds
    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);
  }

  void displayMessage(String msg) {
    display.append(msg + newline);
    System.out.println(msg);
  }

  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);
    display.append(msg + newline);
    System.out.println(msg);
  }

  String convertStateToString(int state) {
    if (state == Frame.NORMAL) {
      return "NORMAL";
    }
    if ((state & Frame.ICONIFIED!= 0) {
      return "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) {
      return "MAXIMIZED_BOTH";
    }
    if ((state & Frame.MAXIMIZED_VERT!= 0) {
      return "MAXIMIZED_VERT";
    }
    if ((state & Frame.MAXIMIZED_HORIZ!= 0) {
      return "MAXIMIZED_HORIZ";
    }
    return "UNKNOWN";
  }

  /**
   * Create the GUI and show it. For thread safety, this method should be
   * invoked from the event-dispatching thread.
   */
  private static void createAndShowGUI() {
    //Make sure we have nice window decorations.
    JFrame.setDefaultLookAndFeelDecorated(true);

    //Create and set up the window.
    frame = new JFrame("WindowEventDemo");
    frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

    //Create and set up the content pane.
    JComponent newContentPane = new WindowEventDemo();
    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();
      }
    });
  }
}

           
         
    
  
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