vcl/osx/documentfocuslistener.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include "documentfocuslistener.hxx"
  21
  22 #include <com/sun/star/accessibility/XAccessibleEventBroadcaster.hpp>
  23 #include <com/sun/star/accessibility/AccessibleEventId.hpp>
  24 #include <com/sun/star/accessibility/AccessibleStateType.hpp>
  25 #include <com/sun/star/lang/IndexOutOfBoundsException.hpp>
  26 #include <sal/log.hxx>
  27
  28 using namespace ::com::sun::star::accessibility;
  29 using namespace ::com::sun::star::lang;
  30 using namespace ::com::sun::star::uno;
  31
  32 DocumentFocusListener::DocumentFocusListener(AquaA11yFocusTracker& rTracker) :
  33     m_aFocusTracker(rTracker)
  34 {
  35 }
  36
  37 void SAL_CALL
  38 DocumentFocusListener::disposing( const EventObject& aEvent )
  39 {
  40     // Unref the object here, but do not remove as listener since the object
  41     // might no longer be in a state that safely allows this.
  42     if( aEvent.Source.is() )
  43         m_aRefList.erase(aEvent.Source);
  44 }
  45
  46 void SAL_CALL
  47 DocumentFocusListener::notifyEvent( const AccessibleEventObject& aEvent )
  48 {
  49     try {
  50         switch( aEvent.EventId )
  51         {
  52             case AccessibleEventId::STATE_CHANGED:
  53             {
  54                 sal_Int16 nState = AccessibleStateType::INVALID;
  55                 aEvent.NewValue >>= nState;
  56
  57                 if( AccessibleStateType::FOCUSED == nState )
  58                     m_aFocusTracker.setFocusedObject( getAccessible(aEvent) );
  59             }
  60             break;
  61
  62             case AccessibleEventId::CHILD:
  63             {
  64                 Reference< XAccessible > xChild;
  65                 if( (aEvent.OldValue >>= xChild) && xChild.is() )
  66                     detachRecursive(xChild);
  67
  68                 if( (aEvent.NewValue >>= xChild) && xChild.is() )
  69                     attachRecursive(xChild);
  70             }
  71             break;
  72
  73             case AccessibleEventId::INVALIDATE_ALL_CHILDREN:
  74             {
  75                 Reference< XAccessible > xAccessible( getAccessible(aEvent) );
  76                 detachRecursive(xAccessible);
  77                 attachRecursive(xAccessible);
  78                 SAL_INFO("vcl", "Invalidate all children called" );
  79             }
  80             break;
  81
  82             default:
  83                 break;
  84         }
  85     }
  86     catch (const IndexOutOfBoundsException&)
  87     {
  88         SAL_WARN("vcl", "Focused object has invalid index in parent");
  89     }
  90 }
  91
  92 Reference< XAccessible > DocumentFocusListener::getAccessible(const EventObject& aEvent )
  93 {
  94     Reference< XAccessible > xAccessible(aEvent.Source, UNO_QUERY);
  95
  96     if( xAccessible.is() )
  97         return xAccessible;
  98
  99     Reference< XAccessibleContext > xContext(aEvent.Source, UNO_QUERY);
 100
 101     if( xContext.is() )
 102     {
 103         Reference< XAccessible > xParent( xContext->getAccessibleParent() );
 104         if( xParent.is() )
 105         {
 106             Reference< XAccessibleContext > xParentContext( xParent->getAccessibleContext() );
 107             if( xParentContext.is() )
 108             {
 109                 return xParentContext->getAccessibleChild( xContext->getAccessibleIndexInParent() );
 110             }
 111         }
 112     }
 113
 114     return Reference< XAccessible >();
 115 }
 116
 117 void DocumentFocusListener::attachRecursive(const Reference< XAccessible >& xAccessible)
 118 {
 119     Reference< XAccessibleContext > xContext = xAccessible->getAccessibleContext();
 120
 121     if( xContext.is() )
 122         attachRecursive(xAccessible, xContext);
 123 }
 124
 125 void DocumentFocusListener::attachRecursive(
 126     const Reference< XAccessible >& xAccessible,
 127     const Reference< XAccessibleContext >& xContext
 128 )
 129 {
 130     if( xContext.is() )
 131     {
 132         Reference< XAccessibleStateSet > xStateSet = xContext->getAccessibleStateSet();
 133
 134         if( xStateSet.is() )
 135             attachRecursive(xAccessible, xContext, xStateSet);
 136     }
 137 }
 138
 139 void DocumentFocusListener::attachRecursive(
 140     const Reference< XAccessible >& xAccessible,
 141     const Reference< XAccessibleContext >& xContext,
 142     const Reference< XAccessibleStateSet >& xStateSet
 143 )
 144 {
 145     if( xStateSet->contains(AccessibleStateType::FOCUSED ) )
 146         m_aFocusTracker.setFocusedObject( xAccessible );
 147
 148     Reference< XAccessibleEventBroadcaster > xBroadcaster(xContext, UNO_QUERY);
 149
 150     // If not already done, add the broadcaster to the list and attach as listener.
 151     if( xBroadcaster.is() && m_aRefList.insert(xBroadcaster).second )
 152     {
 153         xBroadcaster->addAccessibleEventListener(static_cast< XAccessibleEventListener *>(this));
 154
 155         if( ! xStateSet->contains(AccessibleStateType::MANAGES_DESCENDANTS ) )
 156         {
 157             sal_Int32 n, nmax = xContext->getAccessibleChildCount();
 158             for( n = 0; n < nmax; n++ )
 159             {
 160                 Reference< XAccessible > xChild( xContext->getAccessibleChild( n ) );
 161
 162                 if( xChild.is() )
 163                     attachRecursive(xChild);
 164             }
 165         }
 166     }
 167 }
 168
 169 void DocumentFocusListener::detachRecursive(const Reference< XAccessible >& xAccessible)
 170 {
 171     Reference< XAccessibleContext > xContext = xAccessible->getAccessibleContext();
 172
 173     if( xContext.is() )
 174         detachRecursive(xAccessible, xContext);
 175 }
 176
 177 void DocumentFocusListener::detachRecursive(
 178     const Reference< XAccessible >& xAccessible,
 179     const Reference< XAccessibleContext >& xContext
 180 )
 181 {
 182     Reference< XAccessibleStateSet > xStateSet = xContext->getAccessibleStateSet();
 183
 184     if( xStateSet.is() )
 185         detachRecursive(xAccessible, xContext, xStateSet);
 186 }
 187
 188 void DocumentFocusListener::detachRecursive(
 189     const Reference< XAccessible >&,
 190     const Reference< XAccessibleContext >& xContext,
 191     const Reference< XAccessibleStateSet >& xStateSet
 192 )
 193 {
 194     Reference< XAccessibleEventBroadcaster > xBroadcaster(xContext, UNO_QUERY);
 195
 196     if( xBroadcaster.is() && 0 < m_aRefList.erase(xBroadcaster) )
 197     {
 198         xBroadcaster->removeAccessibleEventListener(static_cast< XAccessibleEventListener *>(this));
 199
 200         if( ! xStateSet->contains(AccessibleStateType::MANAGES_DESCENDANTS ) )
 201         {
 202             sal_Int32 n, nmax = xContext->getAccessibleChildCount();
 203             for( n = 0; n < nmax; n++ )
 204             {
 205                 Reference< XAccessible > xChild( xContext->getAccessibleChild( n ) );
 206
 207                 if( xChild.is() )
 208                     detachRecursive(xChild);
 209             }
 210         }
 211     }
 212 }
 213
 214 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */