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13   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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25  
26  package java.awt.event;
27  
28  /**
29   * An abstract adapter class for receiving component 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>ComponentEvent</code> listener
34   * and override the methods for the events of interest. (If you implement the
35   * <code>ComponentListener</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 your class and then register it with a
40   * component using the component's <code>addComponentListener</code>
41   * method. When the component's size, location, or visibility
42   * changes, the relevant method in the listener object is invoked,
43   * and the <code>ComponentEvent</code> is passed to it.
44   *
45   * @see ComponentEvent
46   * @see ComponentListener
47   * @see <a href="http://docs.oracle.com/javase/tutorial/uiswing/events/componentlistener.html">Tutorial: Writing a Component Listener</a>
48   *
49   * @author Carl Quinn
50   * @since 1.1
51   */
52  public abstract class ComponentAdapter implements ComponentListener {
53      /**
54       * Invoked when the component's size changes.
55       */
56      public void componentResized(ComponentEvent e) {}
57  
58      /**
59       * Invoked when the component's position changes.
60       */
61      public void componentMoved(ComponentEvent e) {}
62  
63      /**
64       * Invoked when the component has been made visible.
65       */
66      public void componentShown(ComponentEvent e) {}
67  
68      /**
69       * Invoked when the component has been made invisible.
70       */
71      public void componentHidden(ComponentEvent e) {}
72  }