SunJDK14ConditionalEventPump


1   /**
2    * Copyright (c) 2002-2005, Simone Bordet
3    * All rights reserved.
4    *
5    * This software is distributable under the BSD license.
6    * See the terms of the BSD license in the documentation provided with this software.
7    */
8   
9   package foxtrot.pumps;
10  
11  import java.awt.AWTEvent  ;
12  import java.awt.EventQueue  ;
13  
14  /**
15   * Specialized ConditionalEventPump for Sun's JDK 1.4 and 5.0.
16   * It fixes what I think is a misbehavior of {@link java.awt.EventQueue#peekEvent()},
17   * that does not flush pending events to the EventQueue before peeking for them.
18   * @version $Revision: 1.9 $
19   */
20  public class SunJDK14ConditionalEventPump extends ConditionalEventPump implements EventFilterable
21  {
22     /**
23      * Flushes pending events before peeking the EventQueue.
24      * There is a mismatch between the behavior of {@link java.awt.EventQueue#getNextEvent()}
25      * and {@link java.awt.EventQueue#peekEvent()}: the first always flushes pending events,
26      * the second does not. This missing flushing is the reason why peekEvent() returns null
27      * causing the proxy implementation of Conditional.evaluate() to never return
28      */
29     protected AWTEvent   peekEvent(EventQueue   queue)
30     {
31        sun.awt.SunToolkit.flushPendingEvents();
32        return super.peekEvent(queue);
33     }
34  }
35

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