libjava/java/awt/EventDispatchThread.java

   1 /* EventDispatchThread.java -
   2    Copyright (C) 2000, 2002, 2004  Free Software Foundation
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38 package java.awt;
  39
  40 /**
  41  * @author Bryce McKinlay
  42  * @status believed complete, but untested.
  43  */
  44 class EventDispatchThread extends Thread
  45 {
  46   private static int dispatchThreadNum;
  47
  48   private EventQueue queue;
  49
  50   EventDispatchThread(EventQueue queue)
  51   {
  52     super();
  53     setName("AWT-EventQueue-" + ++dispatchThreadNum);
  54     this.queue = queue;
  55     setPriority(NORM_PRIORITY + 1);
  56   }
  57
  58   public void run()
  59   {
  60     while (true)
  61       {
  62         try
  63         {
  64           AWTEvent evt = queue.getNextEvent();
  65
  66           KeyboardFocusManager manager;
  67           manager = KeyboardFocusManager.getCurrentKeyboardFocusManager ();
  68
  69           // Try to dispatch this event to the current keyboard focus
  70           // manager.  It will dispatch all FocusEvents, all
  71           // WindowEvents related to focus, and all KeyEvents,
  72           // returning true.  Otherwise, it returns false and we
  73           // dispatch the event normally.
  74           if (!manager.dispatchEvent (evt))
  75             queue.dispatchEvent(evt);
  76         }
  77         catch (ThreadDeath death)
  78         {
  79           // If someone wants to kill us, let them.
  80           return;
  81         }
  82         catch (InterruptedException ie)
  83         {
  84           // We are interrupted when we should finish executing
  85           return;
  86         }
  87         catch (Throwable x)
  88         {
  89           System.err.println("Exception during event dispatch:");
  90           x.printStackTrace(System.err);
  91         }
  92       }
  93   }
  94 }