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1   /*
2    * Copyright (c) 1996, 2013, Oracle and/or its affiliates. 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
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7    * published by the Free Software Foundation.  Oracle designates this
8    * particular file as subject to the "Classpath" exception as provided
9    * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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24   */
25  
26  package java.awt.event;
27  
28  import java.util.EventListener;
29  
30  /**
31   * The listener interface for receiving component events.
32   * The class that is interested in processing a component event
33   * either implements this interface (and all the methods it
34   * contains) or extends the abstract <code>ComponentAdapter</code> class
35   * (overriding only the methods of interest).
36   * The listener object created from that class is then registered with a
37   * component using the component's <code>addComponentListener</code>
38   * method. When the component's size, location, or visibility
39   * changes, the relevant method in the listener object is invoked,
40   * and the <code>ComponentEvent</code> is passed to it.
41   * <P>
42   * Component events are provided for notification purposes ONLY;
43   * The AWT will automatically handle component moves and resizes
44   * internally so that GUI layout works properly regardless of
45   * whether a program registers a <code>ComponentListener</code> or not.
46   *
47   * @see ComponentAdapter
48   * @see ComponentEvent
49   * @see <a href="http://docs.oracle.com/javase/tutorial/uiswing/events/componentlistener.html">Tutorial: Writing a Component Listener</a>
50   *
51   * @author Carl Quinn
52   * @since 1.1
53   */
54  public interface ComponentListener extends EventListener {
55      /**
56       * Invoked when the component's size changes.
57       */
58      public void componentResized(ComponentEvent e);
59  
60      /**
61       * Invoked when the component's position changes.
62       */
63      public void componentMoved(ComponentEvent e);
64  
65      /**
66       * Invoked when the component has been made visible.
67       */
68      public void componentShown(ComponentEvent e);
69  
70      /**
71       * Invoked when the component has been made invisible.
72       */
73      public void componentHidden(ComponentEvent e);
74  }