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/* -*- 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;
OAccessibleContextHelper::OAccessibleContextHelper( )
:OAccessibleContextHelper_Base( GetMutex() )
,m_nClientId( 0 )
{
}
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_nClientId )
{
AccessibleEventNotifier::revokeClientNotifyDisposing( m_nClientId, *this );
m_nClientId=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_nClientId )
m_nClientId = AccessibleEventNotifier::registerClient( );
AccessibleEventNotifier::addEventListener( m_nClientId, _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_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 OAccessibleContextHelper::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 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_aCreator = _rxAccessible;
}
Reference< XAccessible > OAccessibleContextHelper::getAccessibleCreator( ) const
{
return m_aCreator;
}
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_aCreator);
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
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