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Java > Open Source Codes > edu > rice > cs > util > swing > RightClickMouseAdapter


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33
34 package edu.rice.cs.util.swing;
35
36 import java.awt.event.*;
37
38 /**
39  * Abstract mouse listener that supports showing a popup menu.
40  * If subclasses override mousePressed() or mouseReleased(), they should
41  * first call the superclass method so that the popup will be shown correctly.
42  * Because of platform differences, we must check for popup trigger both
43  * when the mouse is pressed and when it is released.
44  */
45 public abstract class RightClickMouseAdapter extends MouseAdapter {
46   /**
47    * Performs the action when the popup trigger is received.
48    * Generally shows a popup context menu.
49    * @param e the MouseEvent that is a popup trigger
50    */
51   protected abstract void _popupAction(MouseEvent e);
52
53   /**
54    * Signals that the mouse has been pressed.
55    * @param e the MouseEvent that just occurred
56    */
57   public void mousePressed(MouseEvent e) {
58     if (e.isPopupTrigger()) {
59       _popupAction(e);
60     }
61   }
62
63   /**
64    * Signals that the mouse has been released.
65    * @param e the MouseEvent that just occurred
66    */
67   public void mouseReleased(MouseEvent e) {
68     if (e.isPopupTrigger()) {
69       _popupAction(e);
70     }
71   }
72 }
73
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