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Diffstat (limited to 'comphelper/source/misc/accessiblecontexthelper.cxx')
| -rw-r--r-- | comphelper/source/misc/accessiblecontexthelper.cxx | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/comphelper/source/misc/accessiblecontexthelper.cxx b/comphelper/source/misc/accessiblecontexthelper.cxx new file mode 100644 index 000000000000..fb89a0bf86a9 --- /dev/null +++ b/comphelper/source/misc/accessiblecontexthelper.cxx @@ -0,0 +1,358 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ + +// MARKER(update_precomp.py): autogen include statement, do not remove +#include "precompiled_comphelper.hxx" +#include <comphelper/accessiblecontexthelper.hxx> +#include <comphelper/accessibleeventbuffer.hxx> +#include <osl/diagnose.h> +#include <cppuhelper/weakref.hxx> +#include <com/sun/star/accessibility/AccessibleEventId.hpp> +#include <com/sun/star/accessibility/AccessibleStateType.hpp> +#include <comphelper/accessibleeventnotifier.hxx> + +//......................................................................... +namespace comphelper +{ +//......................................................................... + + using namespace ::com::sun::star::uno; + using namespace ::com::sun::star::lang; + using namespace ::com::sun::star::accessibility; + + //===================================================================== + //= OContextHelper_Impl + //===================================================================== + /** implementation class for OAccessibleContextHelper. No own thread safety! + */ + class OContextHelper_Impl + { + private: + OAccessibleContextHelper* m_pAntiImpl; // the owning instance + IMutex* m_pExternalLock; // the optional additional external lock + + ::cppu::OInterfaceContainerHelper* m_pEventListeners; + WeakReference< XAccessible > m_aCreator; // the XAccessible which created our XAccessibleContext + + AccessibleEventNotifier::TClientId m_nClientId; + + public: + inline Reference< XAccessible > getCreator( ) const { return m_aCreator; } + inline void setCreator( const Reference< XAccessible >& _rAcc ); + + inline IMutex* getExternalLock( ) { return m_pExternalLock; } + inline void setExternalLock( IMutex* _pLock ) { m_pExternalLock = _pLock; } + + inline AccessibleEventNotifier::TClientId + getClientId() const { return m_nClientId; } + inline void setClientId( const AccessibleEventNotifier::TClientId _nId ) + { m_nClientId = _nId; } + + public: + OContextHelper_Impl( OAccessibleContextHelper* _pAntiImpl ) + :m_pAntiImpl( _pAntiImpl ) + ,m_pExternalLock( NULL ) + ,m_pEventListeners( NULL ) + ,m_nClientId( 0 ) + { + } + }; + + //--------------------------------------------------------------------- + inline void OContextHelper_Impl::setCreator( const Reference< XAccessible >& _rAcc ) + { + m_aCreator = _rAcc; + } + + //===================================================================== + //= OAccessibleContextHelper + //===================================================================== + //--------------------------------------------------------------------- + OAccessibleContextHelper::OAccessibleContextHelper( ) + :OAccessibleContextHelper_Base( GetMutex() ) + ,m_pImpl( NULL ) + { + m_pImpl = new OContextHelper_Impl( this ); + } + + //--------------------------------------------------------------------- + OAccessibleContextHelper::OAccessibleContextHelper( IMutex* _pExternalLock ) + :OAccessibleContextHelper_Base( GetMutex() ) + ,m_pImpl( NULL ) + { + m_pImpl = new OContextHelper_Impl( this ); + m_pImpl->setExternalLock( _pExternalLock ); + } + + //--------------------------------------------------------------------- + void OAccessibleContextHelper::forgetExternalLock() + { + m_pImpl->setExternalLock( NULL ); + } + + //--------------------------------------------------------------------- + OAccessibleContextHelper::~OAccessibleContextHelper( ) + { + forgetExternalLock(); + // this ensures that the lock, which may be already destroyed as part of the derivee, + // is not used anymore + + ensureDisposed(); + + delete m_pImpl; + m_pImpl = NULL; + } + + //--------------------------------------------------------------------- + IMutex* OAccessibleContextHelper::getExternalLock( ) + { + return m_pImpl->getExternalLock(); + } + + //--------------------------------------------------------------------- + void SAL_CALL OAccessibleContextHelper::disposing() + { + ::osl::ClearableMutexGuard aGuard( GetMutex() ); + + if ( m_pImpl->getClientId( ) ) + { + AccessibleEventNotifier::revokeClientNotifyDisposing( m_pImpl->getClientId( ), *this ); + m_pImpl->setClientId( 0 ); + } + } + + //--------------------------------------------------------------------- + void SAL_CALL OAccessibleContextHelper::addEventListener( const Reference< XAccessibleEventListener >& _rxListener ) throw (RuntimeException) + { + OMutexGuard aGuard( getExternalLock() ); + // 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::removeEventListener( const Reference< XAccessibleEventListener >& _rxListener ) throw (RuntimeException) + { + OMutexGuard aGuard( getExternalLock() ); + // 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() ) + { + 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 SAL_CALL 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 ); + } + + //--------------------------------------------------------------------- + void SAL_CALL OAccessibleContextHelper::BufferAccessibleEvent( const sal_Int16 _nEventId, + const Any& _rOldValue, const Any& _rNewValue, + AccessibleEventBuffer & _rBuffer ) + { + // TODO: this whole method (as well as the class AccessibleEventBuffer) should be removed + // The reasons why they have been introduces id that we needed to collect a set of events + // before notifying them alltogether (after releasing our mutex). With the other + // NotifyAccessibleEvent being asynchronous now, this should not be necessary anymore + // - clients could use the other version now. + + // copy our current listeners + Sequence< Reference< XInterface > > aListeners; + if ( m_pImpl->getClientId( ) ) + aListeners = AccessibleEventNotifier::getEventListeners( m_pImpl->getClientId( ) ); + + if ( aListeners.getLength() ) + { + AccessibleEventObject aEvent; + aEvent.Source = *this; + OSL_ENSURE( aEvent.Source.is(), "OAccessibleContextHelper::BufferAccessibleEvent: invalid creator!" ); + aEvent.EventId = _nEventId; + aEvent.OldValue = _rOldValue; + aEvent.NewValue = _rNewValue; + + _rBuffer.addEvent( aEvent, aListeners ); + } + } + + //--------------------------------------------------------------------- + sal_Bool OAccessibleContextHelper::isAlive() const + { + return !GetBroadcastHelper().bDisposed && !GetBroadcastHelper().bInDispose; + } + + //--------------------------------------------------------------------- + void OAccessibleContextHelper::ensureAlive() const SAL_THROW( ( DisposedException ) ) + { + if( !isAlive() ) + throw DisposedException(); + } + + //--------------------------------------------------------------------- + void OAccessibleContextHelper::ensureDisposed( ) + { + if ( !GetBroadcastHelper().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( ) throw (RuntimeException) + { + 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( ) throw (IllegalAccessibleComponentStateException, RuntimeException) + { + // simply ask the parent + Reference< XAccessible > xParent = getAccessibleParent(); + Reference< XAccessibleContext > xParentContext; + if ( xParent.is() ) + xParentContext = xParent->getAccessibleContext(); + + if ( !xParentContext.is() ) + throw IllegalAccessibleComponentStateException( ::rtl::OUString(), *this ); + + return xParentContext->getLocale(); + } + + //--------------------------------------------------------------------- + Reference< XAccessibleContext > OAccessibleContextHelper::implGetParentContext() SAL_THROW( ( RuntimeException ) ) + { + Reference< XAccessible > xParent = getAccessibleParent(); + Reference< XAccessibleContext > xParentContext; + if ( xParent.is() ) + xParentContext = xParent->getAccessibleContext(); + return xParentContext; + } + +//......................................................................... +} // namespace comphelper +//......................................................................... + + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |