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Java > Open Source Codes > java > awt > event > 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 JavaDoc;
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 JavaDoc {
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 JavaDoc 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 JavaDoc e);
53 }
54
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