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| -rw-r--r-- | comphelper/source/misc/accessiblewrapper.cxx | 616 |
1 files changed, 616 insertions, 0 deletions
diff --git a/comphelper/source/misc/accessiblewrapper.cxx b/comphelper/source/misc/accessiblewrapper.cxx new file mode 100644 index 000000000..1167f5640 --- /dev/null +++ b/comphelper/source/misc/accessiblewrapper.cxx @@ -0,0 +1,616 @@ +/* -*- 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().swap(m_aChildrenMap); + } + + + Reference< XAccessible > OWrappedAccessibleChildrenManager::getAccessibleWrapperFor( + const Reference< XAccessible >& _rxKey ) + { + rtl::Reference< OAccessibleWrapper > 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->getContextNoCreate(), + ::css::uno::UNO_QUERY ); + if( xContextComponent.is() ) + xContextComponent->dispose(); + } + + // clear our children + AccessibleMap().swap(m_aChildrenMap); + } + + + 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; + } + + + rtl::Reference<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: */ |