toolkit/test/accessibility/ov/ListeningObjectView.java

   1 package ov;
   2
   3 import com.sun.star.accessibility.AccessibleEventObject;
   4 import com.sun.star.accessibility.XAccessibleContext;
   5 import com.sun.star.accessibility.XAccessibleEventBroadcaster;
   6 import com.sun.star.accessibility.XAccessibleEventListener;
   7 import com.sun.star.lang.EventObject;
   8 import com.sun.star.uno.UnoRuntime;
   9
  10 /** Base class for object views that regsiters as accessibility event
  11     listener.
  12 */
  13 abstract class ListeningObjectView
  14     extends ObjectView
  15     implements XAccessibleEventListener
  16 {
  17     public ListeningObjectView (ObjectViewContainer aContainer)
  18     {
  19         super (aContainer);
  20     }
  21
  22     /** Add this object as event listener at the broadcasting
  23         accessible object.
  24     */
  25     public void SetObject (XAccessibleContext xContext)
  26     {
  27         super.SetObject (xContext);
  28         XAccessibleEventBroadcaster xBroadcaster =
  29             (XAccessibleEventBroadcaster)UnoRuntime.queryInterface(
  30                 XAccessibleEventBroadcaster.class, xContext);
  31         if (xBroadcaster != null)
  32             xBroadcaster.addEventListener (this);
  33     }
  34
  35
  36     /** Remove this object as event listener from the broadcasting
  37         accessible object.
  38     */
  39     public void Destroy ()
  40     {
  41         super.Destroy ();
  42         XAccessibleEventBroadcaster xBroadcaster =
  43             (XAccessibleEventBroadcaster)UnoRuntime.queryInterface(
  44                 XAccessibleEventBroadcaster.class, mxContext);
  45         if (xBroadcaster != null)
  46             xBroadcaster.removeEventListener (this);
  47     }
  48
  49     /** Derived classes have to implement this method to handle incoming
  50         events.
  51     */
  52     abstract public void notifyEvent (AccessibleEventObject aEvent);
  53
  54     /** The disposing event is ignored per default.  If a derived class is
  55         interested it can overwrite this method.
  56     */
  57     public void disposing (EventObject aEvent)
  58     {
  59     }
  60 }