Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 618 insertions, 0 deletions

diff --git a/comphelper/source/misc/accessiblewrapper.cxx b/comphelper/source/misc/accessiblewrapper.cxx
new file mode 100644
index 000000000..4d4edb139
--- /dev/null
+++ b/comphelper/source/misc/accessiblewrapper.cxx
@@ -0,0 +1,618 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <comphelper/accessiblewrapper.hxx>
+#include <com/sun/star/accessibility/AccessibleEventId.hpp>
+#include <com/sun/star/accessibility/AccessibleStateType.hpp>
+
+using namespace ::comphelper;
+using namespace ::com::sun::star::accessibility;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+
+
+namespace comphelper
+{
+    OWrappedAccessibleChildrenManager::OWrappedAccessibleChildrenManager( const Reference< XComponentContext >& _rxContext )
+        :m_xContext( _rxContext )
+        ,m_bTransientChildren( true )
+    {
+    }
+
+
+    OWrappedAccessibleChildrenManager::~OWrappedAccessibleChildrenManager( )
+    {
+    }
+
+
+    void OWrappedAccessibleChildrenManager::setTransientChildren( bool _bSet )
+    {
+        m_bTransientChildren = _bSet;
+    }
+
+
+    void OWrappedAccessibleChildrenManager::setOwningAccessible( const Reference< XAccessible >& _rxAcc )
+    {
+        OSL_ENSURE( !m_aOwningAccessible.get().is(), "OWrappedAccessibleChildrenManager::setOwningAccessible: to be called only once!" );
+        m_aOwningAccessible = WeakReference< XAccessible >( _rxAcc );
+    }
+
+
+    void OWrappedAccessibleChildrenManager::removeFromCache( const Reference< XAccessible >& _rxKey )
+    {
+        AccessibleMap::iterator aRemovedPos = m_aChildrenMap.find( _rxKey );
+        if ( m_aChildrenMap.end() != aRemovedPos )
+        {   // it was cached
+            // remove ourself as event listener
+            Reference< XComponent > xComp( aRemovedPos->first, UNO_QUERY );
+            if( xComp.is() )
+                xComp->removeEventListener( this );
+            // and remove the entry from the map
+            m_aChildrenMap.erase( aRemovedPos );
+        }
+    }
+
+
+    void OWrappedAccessibleChildrenManager::invalidateAll( )
+    {
+        // remove as event listener from the map elements
+        for( const auto& rChild : m_aChildrenMap )
+        {
+            Reference< XComponent > xComp( rChild.first, UNO_QUERY );
+            if( xComp.is() )
+                xComp->removeEventListener( this );
+        }
+        // clear the map
+        AccessibleMap aMap;
+        m_aChildrenMap.swap( aMap );
+    }
+
+
+    Reference< XAccessible > OWrappedAccessibleChildrenManager::getAccessibleWrapperFor(
+        const Reference< XAccessible >& _rxKey )
+    {
+        Reference< XAccessible > xValue;
+
+        if( !_rxKey.is() )
+        {
+            // fprintf( stderr, "It was this path that was crashing stuff\n" );
+            return xValue;
+        }
+
+        // do we have this child in the cache?
+        AccessibleMap::const_iterator aPos = m_aChildrenMap.find( _rxKey );
+        if ( m_aChildrenMap.end() != aPos )
+        {
+            xValue = aPos->second;
+        }
+        else
+        {   // not found in the cache, and allowed to create
+            // -> new wrapper
+            xValue = new OAccessibleWrapper( m_xContext, _rxKey, m_aOwningAccessible );
+
+            // see if we do cache children
+            if ( !m_bTransientChildren )
+            {
+                if (!m_aChildrenMap.emplace( _rxKey, xValue ).second)
+                {
+                    OSL_FAIL(
+                        "OWrappedAccessibleChildrenManager::"
+                            "getAccessibleWrapperFor: element was already"
+                            " inserted!" );
+                }
+
+                // listen for disposals of inner children - this may happen when the inner context
+                // is the owner for the inner children (it will dispose these children, and of course
+                // not our wrapper for these children)
+                Reference< XComponent > xComp( _rxKey, UNO_QUERY );
+                if ( xComp.is() )
+                    xComp->addEventListener( this );
+            }
+        }
+
+        return xValue;
+    }
+
+
+    void OWrappedAccessibleChildrenManager::dispose()
+    {
+        // dispose our children
+        for( const auto& rChild : m_aChildrenMap )
+        {
+            Reference< XComponent > xComp( rChild.first, UNO_QUERY );
+            if( xComp.is() )
+                xComp->removeEventListener( this );
+
+            Reference< XComponent > xContextComponent;
+            if( rChild.second.is() )
+                xContextComponent.set( rChild.second->getAccessibleContext(),
+                                       ::css::uno::UNO_QUERY );
+            if( xContextComponent.is() )
+                xContextComponent->dispose();
+        }
+
+        // clear our children
+        AccessibleMap aMap;
+        m_aChildrenMap.swap( aMap );
+    }
+
+
+    void OWrappedAccessibleChildrenManager::implTranslateChildEventValue( const Any& _rInValue, Any& _rOutValue )
+    {
+        _rOutValue.clear();
+        Reference< XAccessible > xChild;
+        if ( _rInValue >>= xChild )
+            _rOutValue <<= getAccessibleWrapperFor( xChild );
+    }
+
+
+    void OWrappedAccessibleChildrenManager::translateAccessibleEvent( const AccessibleEventObject& _rEvent, AccessibleEventObject& _rTranslatedEvent )
+    {
+        // just in case we can't translate some of the values:
+        _rTranslatedEvent.NewValue = _rEvent.NewValue;
+        _rTranslatedEvent.OldValue = _rEvent.OldValue;
+
+        switch ( _rEvent.EventId )
+        {
+            case AccessibleEventId::CHILD:
+            case AccessibleEventId::ACTIVE_DESCENDANT_CHANGED:
+            case AccessibleEventId::CONTROLLED_BY_RELATION_CHANGED:
+            case AccessibleEventId::CONTROLLER_FOR_RELATION_CHANGED:
+            case AccessibleEventId::LABEL_FOR_RELATION_CHANGED:
+            case AccessibleEventId::LABELED_BY_RELATION_CHANGED:
+            case AccessibleEventId::CONTENT_FLOWS_FROM_RELATION_CHANGED:
+            case AccessibleEventId::CONTENT_FLOWS_TO_RELATION_CHANGED:
+                // these are events where both the old and the new value contain child references
+                implTranslateChildEventValue( _rEvent.OldValue, _rTranslatedEvent.OldValue );
+                implTranslateChildEventValue( _rEvent.NewValue, _rTranslatedEvent.NewValue );
+                break;
+
+            case AccessibleEventId::NAME_CHANGED:
+            case AccessibleEventId::DESCRIPTION_CHANGED:
+            case AccessibleEventId::ACTION_CHANGED:
+            case AccessibleEventId::STATE_CHANGED:
+            case AccessibleEventId::BOUNDRECT_CHANGED:
+            case AccessibleEventId::INVALIDATE_ALL_CHILDREN:
+            case AccessibleEventId::SELECTION_CHANGED:
+            case AccessibleEventId::VISIBLE_DATA_CHANGED:
+            case AccessibleEventId::VALUE_CHANGED:
+            case AccessibleEventId::MEMBER_OF_RELATION_CHANGED:
+            case AccessibleEventId::CARET_CHANGED:
+            case AccessibleEventId::TEXT_CHANGED:
+            case AccessibleEventId::HYPERTEXT_CHANGED:
+            case AccessibleEventId::TABLE_CAPTION_CHANGED:
+            case AccessibleEventId::TABLE_COLUMN_DESCRIPTION_CHANGED:
+            case AccessibleEventId::TABLE_COLUMN_HEADER_CHANGED:
+            case AccessibleEventId::TABLE_MODEL_CHANGED:
+            case AccessibleEventId::TABLE_ROW_DESCRIPTION_CHANGED:
+            case AccessibleEventId::TABLE_ROW_HEADER_CHANGED:
+            case AccessibleEventId::TABLE_SUMMARY_CHANGED:
+            // these Ids are also missed: SUB_WINDOW_OF_RELATION_CHANGED & TEXT_ATTRIBUTE_CHANGED
+            case AccessibleEventId::TEXT_SELECTION_CHANGED:
+                // nothing to translate
+                break;
+
+            default:
+                OSL_FAIL( "OWrappedAccessibleChildrenManager::translateAccessibleEvent: unknown (or unexpected) event id!" );
+                break;
+        }
+    }
+
+
+    void OWrappedAccessibleChildrenManager::handleChildNotification( const AccessibleEventObject& _rEvent )
+    {
+        if ( AccessibleEventId::INVALIDATE_ALL_CHILDREN == _rEvent.EventId )
+        {   // clear our child map
+            invalidateAll( );
+        }
+        else if ( AccessibleEventId::CHILD == _rEvent.EventId )
+        {
+            // check if the removed or replaced element is cached
+            Reference< XAccessible > xRemoved;
+            if ( _rEvent.OldValue >>= xRemoved )
+                removeFromCache( xRemoved );
+        }
+    }
+
+
+    void SAL_CALL OWrappedAccessibleChildrenManager::disposing( const EventObject& _rSource )
+    {
+        // this should come from one of the inner XAccessible's of our children
+        Reference< XAccessible > xSource( _rSource.Source, UNO_QUERY );
+        AccessibleMap::iterator aDisposedPos = m_aChildrenMap.find( xSource );
+#if OSL_DEBUG_LEVEL > 0
+        if ( m_aChildrenMap.end() == aDisposedPos )
+        {
+            OSL_FAIL( "OWrappedAccessibleChildrenManager::disposing: where did this come from?" );
+            // helper for diagnostics
+            Reference< XAccessible > xOwningAccessible( m_aOwningAccessible );
+            Reference< XAccessibleContext > xContext;
+            try
+            {
+                if ( xOwningAccessible.is() )
+                    xContext = xOwningAccessible->getAccessibleContext();
+                if ( xContext.is() )
+                {
+                    //TODO: do something
+                    //OUString sName = xContext->getAccessibleName();
+                    //OUString sDescription = xContext->getAccessibleDescription();
+                    //sal_Int32 nPlaceYourBreakpointHere = 0;
+                }
+            }
+            catch( const Exception& /*e*/ )
+            {
+                // silent this, it's only diagnostics which failed
+            }
+        }
+#endif
+        if ( m_aChildrenMap.end() != aDisposedPos )
+        {
+            m_aChildrenMap.erase( aDisposedPos );
+        }
+    }
+
+    OAccessibleWrapper::OAccessibleWrapper( const Reference< XComponentContext >& _rxContext,
+            const Reference< XAccessible >& _rxInnerAccessible, const Reference< XAccessible >& _rxParentAccessible )
+        :OAccessibleWrapper_Base( )
+        ,OComponentProxyAggregation( _rxContext, Reference< XComponent >( _rxInnerAccessible, UNO_QUERY ) )
+        ,m_xParentAccessible( _rxParentAccessible )
+        ,m_xInnerAccessible( _rxInnerAccessible )
+    {
+    }
+
+
+    OAccessibleWrapper::~OAccessibleWrapper( )
+    {
+        if ( !m_rBHelper.bDisposed )
+        {
+            acquire();  // to prevent duplicate dtor calls
+            dispose();
+        }
+    }
+
+
+    IMPLEMENT_FORWARD_XTYPEPROVIDER2( OAccessibleWrapper, OComponentProxyAggregation, OAccessibleWrapper_Base )
+    IMPLEMENT_FORWARD_REFCOUNT( OAccessibleWrapper, OComponentProxyAggregation )
+
+
+    Any OAccessibleWrapper::queryInterface( const Type& _rType )
+    {
+        // #111089# instead of the inner XAccessible the proxy XAccessible must be returned
+        Any aReturn = OAccessibleWrapper_Base::queryInterface( _rType );
+        if ( !aReturn.hasValue() )
+            aReturn = OComponentProxyAggregation::queryInterface( _rType );
+
+        return aReturn;
+    }
+
+
+    Reference< XAccessibleContext > OAccessibleWrapper::getContextNoCreate( ) const
+    {
+        return m_aContext;
+    }
+
+
+    OAccessibleContextWrapper* OAccessibleWrapper::createAccessibleContext( const Reference< XAccessibleContext >& _rxInnerContext )
+    {
+        return new OAccessibleContextWrapper( getComponentContext(), _rxInnerContext, this, m_xParentAccessible );
+    }
+
+
+    Reference< XAccessibleContext > SAL_CALL OAccessibleWrapper::getAccessibleContext(  )
+    {
+        // see if the context is still alive (we cache it)
+        Reference< XAccessibleContext > xContext = m_aContext;
+        if ( !xContext.is() )
+        {
+            // create a new context
+            Reference< XAccessibleContext > xInnerContext = m_xInnerAccessible->getAccessibleContext( );
+            if ( xInnerContext.is() )
+            {
+                xContext = createAccessibleContext( xInnerContext );
+                // cache it
+                m_aContext = WeakReference< XAccessibleContext >( xContext );
+            }
+        }
+
+        return xContext;
+    }
+
+    OAccessibleContextWrapperHelper::OAccessibleContextWrapperHelper(
+                const Reference< XComponentContext >& _rxContext,
+                ::cppu::OBroadcastHelper& _rBHelper,
+                const Reference< XAccessibleContext >& _rxInnerAccessibleContext,
+                const Reference< XAccessible >& _rxOwningAccessible,
+                const Reference< XAccessible >& _rxParentAccessible )
+        :OComponentProxyAggregationHelper( _rxContext, _rBHelper )
+        ,m_xInnerContext( _rxInnerAccessibleContext )
+        ,m_xOwningAccessible( _rxOwningAccessible )
+        ,m_xParentAccessible( _rxParentAccessible )
+        // initialize the mapper for our children
+        ,m_xChildMapper( new OWrappedAccessibleChildrenManager( getComponentContext() ) )
+    {
+        // determine if we're allowed to cache children
+        Reference< XAccessibleStateSet > xStates( m_xInnerContext->getAccessibleStateSet( ) );
+        OSL_ENSURE( xStates.is(), "OAccessibleContextWrapperHelper::OAccessibleContextWrapperHelper: no inner state set!" );
+        m_xChildMapper->setTransientChildren( !xStates.is() || xStates->contains( AccessibleStateType::MANAGES_DESCENDANTS) );
+
+        m_xChildMapper->setOwningAccessible( m_xOwningAccessible );
+    }
+
+
+    void OAccessibleContextWrapperHelper::aggregateProxy( oslInterlockedCount& _rRefCount, ::cppu::OWeakObject& _rDelegator )
+    {
+        Reference< XComponent > xInnerComponent( m_xInnerContext, UNO_QUERY );
+        OSL_ENSURE( xInnerComponent.is(), "OComponentProxyAggregation::aggregateProxy: accessible is no XComponent!" );
+        if ( xInnerComponent.is() )
+            componentAggregateProxyFor( xInnerComponent, _rRefCount, _rDelegator );
+
+        // add as event listener to the inner context, because we want to multiplex the AccessibleEvents
+        osl_atomic_increment( &_rRefCount );
+        {
+            Reference< XAccessibleEventBroadcaster > xBroadcaster( m_xInner, UNO_QUERY );
+            if ( xBroadcaster.is() )
+                xBroadcaster->addAccessibleEventListener( this );
+        }
+        osl_atomic_decrement( &_rRefCount );
+    }
+
+
+    OAccessibleContextWrapperHelper::~OAccessibleContextWrapperHelper( )
+    {
+        OSL_ENSURE( m_rBHelper.bDisposed, "OAccessibleContextWrapperHelper::~OAccessibleContextWrapperHelper: you should ensure (in your dtor) that the object is disposed!" );
+    }
+
+
+    Any SAL_CALL OAccessibleContextWrapperHelper::queryInterface( const Type& _rType )
+    {
+        Any aReturn = OComponentProxyAggregationHelper::queryInterface( _rType );
+        if ( !aReturn.hasValue() )
+            aReturn = OAccessibleContextWrapperHelper_Base::queryInterface( _rType );
+        return aReturn;
+    }
+
+
+    IMPLEMENT_FORWARD_XTYPEPROVIDER2( OAccessibleContextWrapperHelper, OComponentProxyAggregationHelper, OAccessibleContextWrapperHelper_Base )
+
+
+    sal_Int32 OAccessibleContextWrapperHelper::baseGetAccessibleChildCount(  )
+    {
+        return m_xInnerContext->getAccessibleChildCount();
+    }
+
+
+    Reference< XAccessible > OAccessibleContextWrapperHelper::baseGetAccessibleChild( sal_Int32 i )
+    {
+        // get the child of the wrapped component
+        Reference< XAccessible > xInnerChild = m_xInnerContext->getAccessibleChild( i );
+        return m_xChildMapper->getAccessibleWrapperFor( xInnerChild );
+    }
+
+
+    Reference< XAccessibleRelationSet > OAccessibleContextWrapperHelper::baseGetAccessibleRelationSet(  )
+    {
+        return m_xInnerContext->getAccessibleRelationSet();
+            // TODO: if this relation set would contain relations to siblings, we would normally need
+            // to wrap them, too...
+    }
+
+
+    void SAL_CALL OAccessibleContextWrapperHelper::notifyEvent( const AccessibleEventObject& _rEvent )
+    {
+#if OSL_DEBUG_LEVEL > 0
+        if ( AccessibleEventId::STATE_CHANGED == _rEvent.EventId )
+        {
+            bool bChildTransienceChanged = false;
+            sal_Int16 nChangeState = 0;
+            if ( _rEvent.OldValue >>= nChangeState )
+                bChildTransienceChanged = bChildTransienceChanged || AccessibleStateType::MANAGES_DESCENDANTS == nChangeState;
+            if ( _rEvent.NewValue >>= nChangeState )
+                bChildTransienceChanged = bChildTransienceChanged || AccessibleStateType::MANAGES_DESCENDANTS == nChangeState;
+            OSL_ENSURE( !bChildTransienceChanged, "OAccessibleContextWrapperHelper::notifyEvent: MANAGES_DESCENDANTS is not expected to change during runtime!" );
+                // if this asserts, then we would need to update our m_bTransientChildren flag here,
+                // as well as (potentially) our child cache
+        }
+#endif
+        AccessibleEventObject aTranslatedEvent( _rEvent );
+
+        {
+            ::osl::MutexGuard aGuard( m_rBHelper.rMutex );
+
+            // translate the event
+            queryInterface( cppu::UnoType<XInterface>::get() ) >>= aTranslatedEvent.Source;
+            m_xChildMapper->translateAccessibleEvent( _rEvent, aTranslatedEvent );
+
+            // see if any of these notifications affect our child manager
+            m_xChildMapper->handleChildNotification( _rEvent );
+
+            if ( aTranslatedEvent.NewValue == m_xInner )
+                aTranslatedEvent.NewValue <<= aTranslatedEvent.Source;
+            if ( aTranslatedEvent.OldValue == m_xInner )
+                aTranslatedEvent.OldValue <<= aTranslatedEvent.Source;
+        }
+
+        notifyTranslatedEvent( aTranslatedEvent );
+    }
+
+
+    void SAL_CALL OAccessibleContextWrapperHelper::dispose()
+    {
+        ::osl::MutexGuard aGuard( m_rBHelper.rMutex );
+
+        // stop multiplexing events
+        Reference< XAccessibleEventBroadcaster > xBroadcaster( m_xInner, UNO_QUERY );
+        OSL_ENSURE( xBroadcaster.is(), "OAccessibleContextWrapperHelper::disposing(): inner context is no broadcaster!" );
+        if ( xBroadcaster.is() )
+            xBroadcaster->removeAccessibleEventListener( this );
+
+        // dispose the child cache/map
+        m_xChildMapper->dispose();
+
+        // let the base class dispose the inner component
+        OComponentProxyAggregationHelper::dispose();
+    }
+
+
+    void SAL_CALL OAccessibleContextWrapperHelper::disposing( const EventObject& _rEvent )
+    {
+        // simply disambiguate this
+        OComponentProxyAggregationHelper::disposing( _rEvent );
+    }
+
+    IMPLEMENT_FORWARD_XINTERFACE2( OAccessibleContextWrapper, OAccessibleContextWrapper_CBase, OAccessibleContextWrapperHelper )
+
+
+    IMPLEMENT_FORWARD_XTYPEPROVIDER2( OAccessibleContextWrapper, OAccessibleContextWrapper_CBase, OAccessibleContextWrapperHelper )
+
+
+    OAccessibleContextWrapper::OAccessibleContextWrapper( const Reference< XComponentContext >& _rxContext,
+            const Reference< XAccessibleContext >& _rxInnerAccessibleContext, const Reference< XAccessible >& _rxOwningAccessible,
+            const Reference< XAccessible >& _rxParentAccessible )
+        :OAccessibleContextWrapper_CBase( m_aMutex )
+        ,OAccessibleContextWrapperHelper( _rxContext, rBHelper, _rxInnerAccessibleContext, _rxOwningAccessible, _rxParentAccessible )
+        ,m_nNotifierClient( 0 )
+    {
+        aggregateProxy( m_refCount, *this );
+    }
+
+
+    OAccessibleContextWrapper::~OAccessibleContextWrapper()
+    {
+    }
+
+
+    sal_Int32 SAL_CALL OAccessibleContextWrapper::getAccessibleChildCount(  )
+    {
+        return baseGetAccessibleChildCount();
+    }
+
+
+    Reference< XAccessible > SAL_CALL OAccessibleContextWrapper::getAccessibleChild( sal_Int32 i )
+    {
+        return baseGetAccessibleChild( i );
+    }
+
+
+    Reference< XAccessible > SAL_CALL OAccessibleContextWrapper::getAccessibleParent(  )
+    {
+        return m_xParentAccessible;
+    }
+
+
+    sal_Int32 SAL_CALL OAccessibleContextWrapper::getAccessibleIndexInParent(  )
+    {
+        return m_xInnerContext->getAccessibleIndexInParent();
+    }
+
+
+    sal_Int16 SAL_CALL OAccessibleContextWrapper::getAccessibleRole(  )
+    {
+        return m_xInnerContext->getAccessibleRole();
+    }
+
+
+    OUString SAL_CALL OAccessibleContextWrapper::getAccessibleDescription(  )
+    {
+        return m_xInnerContext->getAccessibleDescription();
+    }
+
+
+    OUString SAL_CALL OAccessibleContextWrapper::getAccessibleName(  )
+    {
+        return m_xInnerContext->getAccessibleName();
+    }
+
+
+    Reference< XAccessibleRelationSet > SAL_CALL OAccessibleContextWrapper::getAccessibleRelationSet(  )
+    {
+        return baseGetAccessibleRelationSet();
+    }
+
+
+    Reference< XAccessibleStateSet > SAL_CALL OAccessibleContextWrapper::getAccessibleStateSet(  )
+    {
+        return m_xInnerContext->getAccessibleStateSet();
+    }
+
+
+    Locale SAL_CALL OAccessibleContextWrapper::getLocale(  )
+    {
+        return m_xInnerContext->getLocale();
+    }
+
+
+    void OAccessibleContextWrapper::notifyTranslatedEvent( const AccessibleEventObject& _rEvent )
+    {
+        if ( m_nNotifierClient )
+            AccessibleEventNotifier::addEvent( m_nNotifierClient, _rEvent );
+    }
+
+
+    void SAL_CALL OAccessibleContextWrapper::addAccessibleEventListener( const Reference< XAccessibleEventListener >& _rxListener )
+    {
+        ::osl::MutexGuard aGuard( m_aMutex );
+        if ( !m_nNotifierClient )
+            m_nNotifierClient = AccessibleEventNotifier::registerClient( );
+        AccessibleEventNotifier::addEventListener( m_nNotifierClient, _rxListener );
+    }
+
+
+    void SAL_CALL OAccessibleContextWrapper::removeAccessibleEventListener( const Reference< XAccessibleEventListener >& _rxListener )
+    {
+        ::osl::MutexGuard aGuard( m_aMutex );
+        if ( m_nNotifierClient )
+        {
+            if ( 0 == AccessibleEventNotifier::removeEventListener( m_nNotifierClient, _rxListener ) )
+            {
+                AccessibleEventNotifier::TClientId nId( m_nNotifierClient );
+                m_nNotifierClient = 0;
+                AccessibleEventNotifier::revokeClient( nId );
+            }
+        }
+    }
+
+
+    void SAL_CALL OAccessibleContextWrapper::disposing()
+    {
+        AccessibleEventNotifier::TClientId nClientId( 0 );
+
+        // --- <mutex lock> -----------------------------------------
+        {
+            ::osl::MutexGuard aGuard( m_aMutex );
+
+            // prepare notifying our AccessibleListeners
+            if ( m_nNotifierClient )
+            {
+                nClientId = m_nNotifierClient;
+                m_nNotifierClient = 0;
+            }
+        }
+        // --- </mutex lock> -----------------------------------------
+
+        // let the base class do
+        OAccessibleContextWrapperHelper::dispose();
+
+        // notify the disposal
+        if ( nClientId )
+            AccessibleEventNotifier::revokeClientNotifyDisposing( nClientId, *this );
+    }
+}   // namespace accessibility
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */