1 /*
2 * Copyright 1996-2006 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package java.awt.event;
27
28 /**
29 * An abstract adapter class for receiving container events.
30 * The methods in this class are empty. This class exists as
31 * convenience for creating listener objects.
32 * <P>
33 * Extend this class to create a <code>ContainerEvent</code> listener
34 * and override the methods for the events of interest. (If you implement the
35 * <code>ContainerListener</code> interface, you have to define all of
36 * the methods in it. This abstract class defines null methods for them
37 * all, so you can only have to define methods for events you care about.)
38 * <P>
39 * Create a listener object using the extended class and then register it with
40 * a component using the component's <code>addContainerListener</code>
41 * method. When the container's contents change because a component has
42 * been added or removed, the relevant method in the listener object is invoked,
43 * and the <code>ContainerEvent</code> is passed to it.
44 *
45 * @see ContainerEvent
46 * @see ContainerListener
47 * @see <a href="http://java.sun.com/docs/books/tutorial/post1.0/ui/containerlistener.html">Tutorial: Writing a Container Listener</a>
48 *
49 * @author Amy Fowler
50 * @since 1.1
51 */
52 public abstract class ContainerAdapter implements ContainerListener {
53 /**
54 * Invoked when a component has been added to the container.
55 */
56 public void componentAdded(ContainerEvent e) {}
57
58 /**
59 * Invoked when a component has been removed from the container.
60 */
61 public void componentRemoved(ContainerEvent e) {}
62 }
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