/* -*- 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 #include #include #include #include #include #include #include namespace comphelper { using namespace ::com::sun::star::uno; using namespace ::com::sun::star::lang; using namespace ::com::sun::star::accessibility; /** implementation class for OAccessibleContextHelper. No own thread safety! */ class OContextHelper_Impl { private: WeakReference< XAccessible > m_aCreator; // the XAccessible which created our XAccessibleContext AccessibleEventNotifier::TClientId m_nClientId; public: Reference< XAccessible > getCreator( ) const { return m_aCreator; } inline void setCreator( const Reference< XAccessible >& _rAcc ); AccessibleEventNotifier::TClientId getClientId() const { return m_nClientId; } void setClientId( const AccessibleEventNotifier::TClientId _nId ) { m_nClientId = _nId; } public: OContextHelper_Impl() :m_nClientId( 0 ) { } }; inline void OContextHelper_Impl::setCreator( const Reference< XAccessible >& _rAcc ) { m_aCreator = _rAcc; } OAccessibleContextHelper::OAccessibleContextHelper( ) :OAccessibleContextHelper_Base( GetMutex() ) ,m_pImpl(new OContextHelper_Impl) { } OAccessibleContextHelper::~OAccessibleContextHelper( ) { // this ensures that the lock, which may be already destroyed as part of the derivee, // is not used anymore ensureDisposed(); } void SAL_CALL OAccessibleContextHelper::disposing() { // rhbz#1001768: de facto this class is locked by SolarMutex; // do not lock m_Mutex because it may cause deadlock osl::Guard aGuard(SolarMutex::get()); if ( m_pImpl->getClientId( ) ) { AccessibleEventNotifier::revokeClientNotifyDisposing( m_pImpl->getClientId( ), *this ); m_pImpl->setClientId( 0 ); } } void SAL_CALL OAccessibleContextHelper::addAccessibleEventListener( const Reference< XAccessibleEventListener >& _rxListener ) { osl::Guard aGuard(SolarMutex::get()); // don't use the OContextEntryGuard - it will throw an exception if we're not alive // anymore, while the most recent specification for XComponent states that we should // silently ignore the call in such a situation if ( !isAlive() ) { if ( _rxListener.is() ) _rxListener->disposing( EventObject( *this ) ); return; } if ( _rxListener.is() ) { if ( !m_pImpl->getClientId( ) ) m_pImpl->setClientId( AccessibleEventNotifier::registerClient( ) ); AccessibleEventNotifier::addEventListener( m_pImpl->getClientId( ), _rxListener ); } } void SAL_CALL OAccessibleContextHelper::removeAccessibleEventListener( const Reference< XAccessibleEventListener >& _rxListener ) { osl::Guard aGuard(SolarMutex::get()); // don't use the OContextEntryGuard - it will throw an exception if we're not alive // anymore, while the most recent specification for XComponent states that we should // silently ignore the call in such a situation if ( !isAlive() ) return; if ( _rxListener.is() && m_pImpl->getClientId() ) { sal_Int32 nListenerCount = AccessibleEventNotifier::removeEventListener( m_pImpl->getClientId( ), _rxListener ); if ( !nListenerCount ) { // no listeners anymore // -> revoke ourself. This may lead to the notifier thread dying (if we were the last client), // and at least to us not firing any events anymore, in case somebody calls // NotifyAccessibleEvent, again AccessibleEventNotifier::revokeClient( m_pImpl->getClientId( ) ); m_pImpl->setClientId( 0 ); } } } void OAccessibleContextHelper::NotifyAccessibleEvent( const sal_Int16 _nEventId, const Any& _rOldValue, const Any& _rNewValue ) { if ( !m_pImpl->getClientId( ) ) // if we don't have a client id for the notifier, then we don't have listeners, then // we don't need to notify anything return; // build an event object AccessibleEventObject aEvent; aEvent.Source = *this; aEvent.EventId = _nEventId; aEvent.OldValue = _rOldValue; aEvent.NewValue = _rNewValue; // let the notifier handle this event AccessibleEventNotifier::addEvent( m_pImpl->getClientId( ), aEvent ); } bool OAccessibleContextHelper::isAlive() const { return !rBHelper.bDisposed && !rBHelper.bInDispose; } void OAccessibleContextHelper::ensureAlive() const { if( !isAlive() ) throw DisposedException(); } void OAccessibleContextHelper::ensureDisposed( ) { if ( !rBHelper.bDisposed ) { OSL_ENSURE( 0 == m_refCount, "OAccessibleContextHelper::ensureDisposed: this method _has_ to be called from without your dtor only!" ); acquire(); dispose(); } } void OAccessibleContextHelper::lateInit( const Reference< XAccessible >& _rxAccessible ) { m_pImpl->setCreator( _rxAccessible ); } Reference< XAccessible > OAccessibleContextHelper::getAccessibleCreator( ) const { return m_pImpl->getCreator(); } sal_Int32 SAL_CALL OAccessibleContextHelper::getAccessibleIndexInParent( ) { OExternalLockGuard aGuard( this ); // -1 for child not found/no parent (according to specification) sal_Int32 nRet = -1; try { Reference< XAccessibleContext > xParentContext( implGetParentContext() ); // iterate over parent's children and search for this object if ( xParentContext.is() ) { // our own XAccessible for comparing with the children of our parent Reference< XAccessible > xCreator( m_pImpl->getCreator() ); OSL_ENSURE( xCreator.is(), "OAccessibleContextHelper::getAccessibleIndexInParent: invalid creator!" ); // two ideas why this could be NULL: // * nobody called our late ctor (init), so we never had a creator at all -> bad // * the creator is already dead. In this case, we should have been disposed, and // never survived the above OContextEntryGuard. // in all other situations the creator should be non-NULL if ( xCreator.is() ) { sal_Int32 nChildCount = xParentContext->getAccessibleChildCount(); for ( sal_Int32 nChild = 0; ( nChild < nChildCount ) && ( -1 == nRet ); ++nChild ) { Reference< XAccessible > xChild( xParentContext->getAccessibleChild( nChild ) ); if ( xChild.get() == xCreator.get() ) nRet = nChild; } } } } catch( const Exception& ) { OSL_FAIL( "OAccessibleContextHelper::getAccessibleIndexInParent: caught an exception!" ); } return nRet; } Locale SAL_CALL OAccessibleContextHelper::getLocale( ) { // simply ask the parent Reference< XAccessible > xParent = getAccessibleParent(); Reference< XAccessibleContext > xParentContext; if ( xParent.is() ) xParentContext = xParent->getAccessibleContext(); if ( !xParentContext.is() ) throw IllegalAccessibleComponentStateException( OUString(), *this ); return xParentContext->getLocale(); } Reference< XAccessibleContext > OAccessibleContextHelper::implGetParentContext() { Reference< XAccessible > xParent = getAccessibleParent(); Reference< XAccessibleContext > xParentContext; if ( xParent.is() ) xParentContext = xParent->getAccessibleContext(); return xParentContext; } } // namespace comphelper /* vim:set shiftwidth=4 softtabstop=4 expandtab: */