Source for java.awt.event.AWTEventListenerProxy

   1: /* AWTEventListenerProxy.java -- wrapper/filter for AWTEventListener
   2:    Copyright (C) 2002, 2005  Free Software Foundation, Inc.
   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., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 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: 
  39: package java.awt.event;
  40: 
  41: import java.awt.AWTEvent;
  42: import java.awt.Toolkit;
  43: import java.util.EventListenerProxy;
  44: 
  45: /**
  46:  * This class allows adding an AWTEventListener which only pays attention to
  47:  * a specific event mask.
  48:  *
  49:  * @author Eric Blake (ebb9@email.byu.edu)
  50:  * @see Toolkit
  51:  * @see EventListenerProxy
  52:  * @since 1.4
  53:  * @status updated to 1.4
  54:  */
  55: public class AWTEventListenerProxy extends EventListenerProxy
  56:   implements AWTEventListener
  57: {
  58:   /** The event mask. */
  59:   private final long mask;
  60: 
  61:   /**
  62:    * Construct an AWT Event Listener which only listens to events in the given
  63:    * mask, passing the work on to the real listener.
  64:    *
  65:    * @param eventMask the mask of events to listen to
  66:    * @param listener the wrapped listener
  67:    */
  68:   public AWTEventListenerProxy(long eventMask, AWTEventListener listener)
  69:   {
  70:     super(listener);
  71:     mask = eventMask;
  72:   }
  73: 
  74:   /**
  75:    * Forwards events on to the delegate if they meet the event mask.
  76:    *
  77:    * @param event the property change event to filter
  78:    * @throws NullPointerException if the delegate this was created with is null
  79:    */
  80:   public void eventDispatched(AWTEvent event)
  81:   {
  82:     int id = event == null ? 0 : event.getID();
  83:     if (((mask & AWTEvent.ACTION_EVENT_MASK) != 0
  84:          && event instanceof ActionEvent)
  85:         || ((mask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0
  86:             && event instanceof AdjustmentEvent)
  87:         || ((mask & AWTEvent.COMPONENT_EVENT_MASK) != 0
  88:             && event instanceof ComponentEvent
  89:             && (id >= ComponentEvent.COMPONENT_FIRST
  90:                 && id <= ComponentEvent.COMPONENT_LAST))
  91:         || ((mask & AWTEvent.CONTAINER_EVENT_MASK) != 0
  92:             && event instanceof ContainerEvent)
  93:         || ((mask & AWTEvent.FOCUS_EVENT_MASK) != 0
  94:             && event instanceof FocusEvent)
  95:         || ((mask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0
  96:             && event instanceof HierarchyEvent
  97:             && (id == HierarchyEvent.ANCESTOR_MOVED
  98:                 || id == HierarchyEvent.ANCESTOR_RESIZED))
  99:         || ((mask & AWTEvent.HIERARCHY_EVENT_MASK) != 0
 100:             && event instanceof HierarchyEvent
 101:             && id == HierarchyEvent.HIERARCHY_CHANGED)
 102:         || ((mask & AWTEvent.INPUT_METHOD_EVENT_MASK) != 0
 103:             && event instanceof InputMethodEvent)
 104:         || ((mask & AWTEvent.INVOCATION_EVENT_MASK) != 0
 105:             && event instanceof InvocationEvent)
 106:         || ((mask & AWTEvent.ITEM_EVENT_MASK) != 0
 107:             && event instanceof ItemEvent)
 108:         || ((mask & AWTEvent.KEY_EVENT_MASK) != 0
 109:             && event instanceof KeyEvent)
 110:         || ((mask & AWTEvent.MOUSE_EVENT_MASK) != 0
 111:             && event instanceof MouseEvent
 112:             && (id == MouseEvent.MOUSE_PRESSED
 113:                 || id == MouseEvent.MOUSE_RELEASED
 114:                 || id == MouseEvent.MOUSE_CLICKED
 115:                 || id == MouseEvent.MOUSE_ENTERED
 116:                 || id == MouseEvent.MOUSE_EXITED))
 117:         || ((mask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0
 118:             && event instanceof MouseEvent
 119:             && (id == MouseEvent.MOUSE_MOVED
 120:                 || id == MouseEvent.MOUSE_DRAGGED))
 121:         || ((mask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0
 122:             && event instanceof MouseWheelEvent)
 123:         || ((mask & AWTEvent.PAINT_EVENT_MASK) != 0
 124:             && event instanceof PaintEvent)
 125:         || ((mask & AWTEvent.TEXT_EVENT_MASK) != 0
 126:             && event instanceof TextEvent)
 127:         || ((mask & AWTEvent.WINDOW_EVENT_MASK) != 0
 128:             && event instanceof WindowEvent
 129:             && (id == WindowEvent.WINDOW_OPENED
 130:                 || id == WindowEvent.WINDOW_CLOSING
 131:                 || id == WindowEvent.WINDOW_CLOSED
 132:                 || id == WindowEvent.WINDOW_ICONIFIED
 133:                 || id == WindowEvent.WINDOW_DEICONIFIED
 134:                 || id == WindowEvent.WINDOW_ACTIVATED
 135:                 || id == WindowEvent.WINDOW_DEACTIVATED))
 136:         || ((mask & AWTEvent.WINDOW_FOCUS_EVENT_MASK) != 0
 137:             && event instanceof WindowEvent
 138:             && (id == WindowEvent.WINDOW_GAINED_FOCUS
 139:                 || id == WindowEvent.WINDOW_LOST_FOCUS))
 140:         || ((mask & AWTEvent.WINDOW_STATE_EVENT_MASK) != 0
 141:             && event instanceof WindowEvent
 142:             && id == WindowEvent.WINDOW_STATE_CHANGED))
 143:       ((AWTEventListener) getListener()).eventDispatched(event);
 144:   }
 145: 
 146:   /**
 147:    * This returns the event mask associated with this listener.
 148:    *
 149:    * @return the event mask
 150:    */
 151:   public long getEventMask()
 152:   {
 153:     return mask;
 154:   }
 155: } // class AWTEventListenerProxy