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1 /*
2  * @(#)FocusListener.java 1.15 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 keyboard focus events on
14  * a component.
15  * The class that is interested in processing a focus event
16  * either implements this interface (and all the methods it
17  * contains) or extends the abstract <code>FocusAdapter</code> class
18  * (overriding only the methods of interest).
19  * The listener object created from that class is then registered with a
20  * component using the component's <code>addFocusListener</code>
21  * method. When the component gains or loses the keyboard focus,
22  * the relevant method in the listener object
23  * is invoked, and the <code>FocusEvent</code> is passed to it.
24  *
25  * @see FocusAdapter
26  * @see FocusEvent
27  * @see <a HREF="http://java.sun.com/docs/books/tutorial/post1.0/ui/focuslistener.html">Tutorial: Writing a Focus Listener</a>
28  * @see <a HREF="http://www.awl.com/cp/javaseries/jcl1_2.html">Reference: The Java Class Libraries (update file)</a>
29  *
30  * @author Carl Quinn
31  * @version 1.15 12/19/03
32  * @since 1.1
33  */
34 public interface FocusListener extends EventListener JavaDoc {
35
36     /**
37      * Invoked when a component gains the keyboard focus.
38      */
39     public void focusGained(FocusEvent JavaDoc e);
40
41     /**
42      * Invoked when a component loses the keyboard focus.
43      */
44     public void focusLost(FocusEvent JavaDoc e);
45 }
46
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