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| -rw-r--r-- | comphelper/source/misc/accessiblecontexthelper.cxx | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/comphelper/source/misc/accessiblecontexthelper.cxx b/comphelper/source/misc/accessiblecontexthelper.cxx new file mode 100644 index 000000000..a4d11cb59 --- /dev/null +++ b/comphelper/source/misc/accessiblecontexthelper.cxx @@ -0,0 +1,279 @@ +/* -*- 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/accessiblecontexthelper.hxx> +#include <osl/diagnose.h> +#include <cppuhelper/weakref.hxx> +#include <com/sun/star/accessibility/IllegalAccessibleComponentStateException.hpp> +#include <comphelper/accessibleeventnotifier.hxx> +#include <comphelper/solarmutex.hxx> + + +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<SolarMutex> 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<SolarMutex> 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<SolarMutex> 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()) ) + return; + + 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(); + } + + + OUString SAL_CALL OAccessibleContextHelper::getAccessibleId( ) + { + return OUString(); + } + + + 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: */ |