toolkit/test/accessibility/ov/ListeningObjectView.java

   1 /*
   2  * This file is part of the LibreOffice project.
   3  *
   4  * This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   7  *
   8  * This file incorporates work covered by the following license notice:
   9  *
  10  *   Licensed to the Apache Software Foundation (ASF) under one or more
  11  *   contributor license agreements. See the NOTICE file distributed
  12  *   with this work for additional information regarding copyright
  13  *   ownership. The ASF licenses this file to you under the Apache
  14  *   License, Version 2.0 (the "License"); you may not use this file
  15  *   except in compliance with the License. You may obtain a copy of
  16  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  17  */
  18
  19 package ov;
  20
  21 import com.sun.star.accessibility.AccessibleEventObject;
  22 import com.sun.star.accessibility.XAccessibleContext;
  23 import com.sun.star.accessibility.XAccessibleEventBroadcaster;
  24 import com.sun.star.accessibility.XAccessibleEventListener;
  25 import com.sun.star.lang.EventObject;
  26 import com.sun.star.uno.UnoRuntime;
  27
  28 /** Base class for object views that registers as accessibility event
  29     listener.
  30 */
  31 abstract class ListeningObjectView
  32     extends ObjectView
  33     implements XAccessibleEventListener
  34 {
  35     public ListeningObjectView (ObjectViewContainer aContainer)
  36     {
  37         super (aContainer);
  38     }
  39
  40     /** Add this object as event listener at the broadcasting
  41         accessible object.
  42     */
  43     @Override
  44     public void SetObject (XAccessibleContext xContext)
  45     {
  46         super.SetObject (xContext);
  47         XAccessibleEventBroadcaster xBroadcaster =
  48             UnoRuntime.queryInterface(
  49             XAccessibleEventBroadcaster.class, xContext);
  50         if (xBroadcaster != null)
  51             xBroadcaster.addAccessibleEventListener (this);
  52     }
  53
  54
  55     /** Remove this object as event listener from the broadcasting
  56         accessible object.
  57     */
  58     @Override
  59     public void Destroy ()
  60     {
  61         super.Destroy ();
  62         XAccessibleEventBroadcaster xBroadcaster =
  63             UnoRuntime.queryInterface(
  64             XAccessibleEventBroadcaster.class, mxContext);
  65         if (xBroadcaster != null)
  66             xBroadcaster.removeAccessibleEventListener (this);
  67     }
  68
  69     /** Derived classes have to implement this method to handle incoming
  70         events.
  71     */
  72     abstract public void notifyEvent (AccessibleEventObject aEvent);
  73
  74     /** The disposing event is ignored per default.  If a derived class is
  75         interested it can overwrite this method.
  76     */
  77     public void disposing (EventObject aEvent)
  78     {
  79     }
  80 }