WindowFocusListener


1   /*
2    * @(#)WindowFocusListener.java 1.6 03/12/19
3    *
4    * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5    * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6    */
7   
8   package java.awt.event;
9   
10  import java.util.EventListener  ;
11  
12  /**
13   * The listener interface for receiving <code>WindowEvents</code>, including
14   * <code>WINDOW_GAINED_FOCUS</code> and <code>WINDOW_LOST_FOCUS</code> events.
15   * The class that is interested in processing a <code>WindowEvent</code>
16   * either implements this interface (and
17   * all the methods it contains) or extends the abstract
18   * <code>WindowAdapter</code> class (overriding only the methods of interest).
19   * The listener object created from that class is then registered with a
20   * <code>Window</code>
21   * using the <code>Window</code>'s <code>addWindowFocusListener</code> method.
22   * When the <code>Window</code>'s
23   * status changes by virtue of it being opened, closed, activated, deactivated,
24   * iconified, or deiconified, or by focus being transfered into or out of the
25   * <code>Window</code>, the relevant method in the listener object is invoked,
26   * and the <code>WindowEvent</code> is passed to it.
27   *
28   * @author David Mendenhall
29   * @version 1.6, 12/19/03
30   *
31   * @see WindowAdapter
32   * @see WindowEvent
33   * @see <a HREF="http://java.sun.com/docs/books/tutorial/post1.0/ui/windowlistener.html">Tutorial: Writing a Window Listener</a>
34   * @see <a HREF="http://www.awl.com/cp/javaseries/jcl1_2.html">Reference: The Java Class Libraries (update file)</a>
35   *
36   * @since 1.4
37   */
38  public interface WindowFocusListener extends EventListener   {
39  
40      /**
41       * Invoked when the Window is set to be the focused Window, which means
42       * that the Window, or one of its subcomponents, will receive keyboard
43       * events.
44       */
45      public void windowGainedFocus(WindowEvent   e);
46  
47      /**
48       * Invoked when the Window is no longer the focused Window, which means
49       * that keyboard events will no longer be delivered to the Window or any of
50       * its subcomponents.
51       */
52      public void windowLostFocus(WindowEvent   e);
53  }
54
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags