toolkit/test/accessibility/EventListener.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 import com.sun.star.accessibility.*;
  20
  21 /** Objects of this class (usually one, singleton?) listen to accessible
  22     events of all objects in all trees.
  23 */
  24 public class EventListener
  25 {
  26     public boolean mbVerbose = false;
  27
  28     public EventListener (AccessibilityTreeModel aTreeModel)
  29     {
  30         maTreeModel = aTreeModel;
  31     }
  32
  33
  34     private static String objectToString(Object aObject)
  35     {
  36         if (aObject == null)
  37             return null;
  38         else
  39             return aObject.toString();
  40     }
  41
  42
  43
  44     /** This method handles accessibility objects that are being disposed.
  45      */
  46     public void disposing (XAccessibleContext xContext)
  47     {
  48         if (mbVerbose)
  49             System.out.println("disposing " + xContext);
  50         maTreeModel.removeNode (xContext);
  51     }
  52
  53     /** This method is called from accessible objects that broadcast
  54         modifications of themselves or from their children.  The event is
  55         processed only, except printing some messages, if the tree is not
  56         locked.  It should be locked during changes to its internal
  57         structure like expanding nodes.
  58     */
  59     public void notifyEvent (AccessibleEventObject aEvent)
  60     {
  61         EventHandler aHandler;
  62
  63         switch (aEvent.EventId)
  64         {
  65             case AccessibleEventId.CHILD:
  66                 aHandler = new ChildEventHandler (aEvent, maTreeModel);
  67                 break;
  68
  69             case AccessibleEventId.BOUNDRECT_CHANGED:
  70             case AccessibleEventId.VISIBLE_DATA_CHANGED:
  71                 aHandler = new GeometryEventHandler (aEvent, maTreeModel);
  72                 break;
  73
  74
  75             case AccessibleEventId.NAME_CHANGED:
  76             case AccessibleEventId.DESCRIPTION_CHANGED:
  77             case AccessibleEventId.STATE_CHANGED:
  78             case AccessibleEventId.SELECTION_CHANGED:
  79                 aHandler = new ContextEventHandler (aEvent, maTreeModel);
  80                 break;
  81
  82             case AccessibleEventId.TABLE_MODEL_CHANGED:
  83             case AccessibleEventId.TABLE_CAPTION_CHANGED:
  84             case AccessibleEventId.TABLE_COLUMN_DESCRIPTION_CHANGED:
  85             case AccessibleEventId.TABLE_COLUMN_HEADER_CHANGED:
  86             case AccessibleEventId.TABLE_ROW_DESCRIPTION_CHANGED:
  87             case AccessibleEventId.TABLE_ROW_HEADER_CHANGED:
  88             case AccessibleEventId.TABLE_SUMMARY_CHANGED:
  89                 aHandler = new TableEventHandler (aEvent, maTreeModel);
  90                 break;
  91
  92             case AccessibleEventId.ACTION_CHANGED:
  93                 aHandler = new EventHandler (aEvent, maTreeModel);
  94                 break;
  95
  96             case AccessibleEventId.HYPERTEXT_CHANGED:
  97                 aHandler = new EventHandler (aEvent, maTreeModel);
  98                 break;
  99
 100             case AccessibleEventId.ACTIVE_DESCENDANT_CHANGED:
 101             case AccessibleEventId.CARET_CHANGED:
 102             case AccessibleEventId.TEXT_CHANGED:
 103             case AccessibleEventId.VALUE_CHANGED:
 104                 aHandler = new EventHandler (aEvent, maTreeModel);
 105                 break;
 106
 107             default:
 108                 aHandler = null;
 109                 break;
 110         }
 111
 112         if (aHandler == null)
 113             System.out.println ("    unhandled event");
 114         else
 115         {
 116             if (mbVerbose)
 117                 aHandler.Print (System.out);
 118             aHandler.Process ();
 119         }
 120     }
 121
 122
 123     private AccessibilityTreeModel maTreeModel;
 124 }