diff options
Diffstat (limited to 'comphelper/source/misc/accessiblecomponenthelper.cxx')
| -rw-r--r-- | comphelper/source/misc/accessiblecomponenthelper.cxx | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/comphelper/source/misc/accessiblecomponenthelper.cxx b/comphelper/source/misc/accessiblecomponenthelper.cxx index 2962bbac95a8..b5ca0bbd9af1 100644 --- a/comphelper/source/misc/accessiblecomponenthelper.cxx +++ b/comphelper/source/misc/accessiblecomponenthelper.cxx @@ -18,6 +18,11 @@ */ #include <comphelper/accessiblecomponenthelper.hxx> +#include <comphelper/accessiblecontexthelper.hxx> +#include <osl/diagnose.h> +#include <com/sun/star/accessibility/IllegalAccessibleComponentStateException.hpp> +#include <comphelper/accessibleeventnotifier.hxx> +#include <comphelper/solarmutex.hxx> namespace comphelper @@ -30,12 +35,213 @@ namespace comphelper using namespace ::com::sun::star::accessibility; OCommonAccessibleComponent::OCommonAccessibleComponent( ) + :OCommonAccessibleComponent_Base( GetMutex() ) + ,m_nClientId( 0 ) { } OCommonAccessibleComponent::~OCommonAccessibleComponent( ) { + // this ensures that the lock, which may be already destroyed as part of the derivee, + // is not used anymore + + ensureDisposed(); + } + + + void SAL_CALL OCommonAccessibleComponent::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_nClientId ) + { + AccessibleEventNotifier::revokeClientNotifyDisposing( m_nClientId, *this ); + m_nClientId=0; + } + } + + + void SAL_CALL OCommonAccessibleComponent::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_nClientId ) + m_nClientId = AccessibleEventNotifier::registerClient( ); + + AccessibleEventNotifier::addEventListener( m_nClientId, _rxListener ); + } + } + + + void SAL_CALL OCommonAccessibleComponent::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_nClientId) ) + return; + + sal_Int32 nListenerCount = AccessibleEventNotifier::removeEventListener( m_nClientId, _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_nClientId ); + m_nClientId = 0; + } + } + + + void OCommonAccessibleComponent::NotifyAccessibleEvent( const sal_Int16 _nEventId, + const Any& _rOldValue, const Any& _rNewValue ) + { + if ( !m_nClientId ) + // 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_nClientId, aEvent ); + } + + + bool OCommonAccessibleComponent::isAlive() const + { + return !rBHelper.bDisposed && !rBHelper.bInDispose; + } + + + void OCommonAccessibleComponent::ensureAlive() const + { + if( !isAlive() ) + throw DisposedException(); + } + + + void OCommonAccessibleComponent::ensureDisposed( ) + { + if ( !rBHelper.bDisposed ) + { + OSL_ENSURE( 0 == m_refCount, "OCommonAccessibleComponent::ensureDisposed: this method _has_ to be called from without your dtor only!" ); + acquire(); + dispose(); + } + } + + + void OCommonAccessibleComponent::lateInit( const Reference< XAccessible >& _rxAccessible ) + { + m_aCreator = _rxAccessible; + } + + + Reference< XAccessible > OCommonAccessibleComponent::getAccessibleCreator( ) const + { + return m_aCreator; + } + + + OUString SAL_CALL OCommonAccessibleComponent::getAccessibleId( ) + { + return OUString(); + } + + + sal_Int64 SAL_CALL OCommonAccessibleComponent::getAccessibleIndexInParent( ) + { + OExternalLockGuard aGuard( this ); + + // -1 for child not found/no parent (according to specification) + sal_Int64 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_aCreator); + + OSL_ENSURE( xCreator.is(), "OCommonAccessibleComponent::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_Int64 nChildCount = xParentContext->getAccessibleChildCount(); + for ( sal_Int64 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( "OCommonAccessibleComponent::getAccessibleIndexInParent: caught an exception!" ); + } + + return nRet; + } + + + Locale SAL_CALL OCommonAccessibleComponent::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 > OCommonAccessibleComponent::implGetParentContext() + { + Reference< XAccessible > xParent = getAccessibleParent(); + Reference< XAccessibleContext > xParentContext; + if ( xParent.is() ) + xParentContext = xParent->getAccessibleContext(); + return xParentContext; } |