office-gobmx/comphelper/source/misc/accessiblewrapper.cxx
Michael Weghorn 206543c7be [API CHANGE] tdf#150683 a11y: Switch a11y child index to 64 bit
With 16k column support in Calc enabled by default in

    commit 4c5f8ccf0a
    Date:   Tue Mar 8 12:44:49 2022 +0100

        change default Calc number of columns to 16384 (tdf#50916)

, the number of Calc cells in a spreadsheet is larger than
SAL_MAX_INT32, meaning that a 32-bit a11y child index is no more
enough and using it resulted in integer overflows in
methods handling corresponding Calc cells in the a11y layer.
This e.g. had the effect of the Orca and NVDA screen readers
not announcing focused or selected cells properly when their
a11y child index was out of the 32-bit integer range.

Switch the internal a11y child indices to 64 bit to
be able to handle this properly internally.

Since the platform APIs (at least AT-SPI on Linux and
IAccessible2 on Windows; from what I can see LO's macOS
a11y bridge doesn't directly expose the child index)
are still restricted to 32 bit, larger child indices
still cannot be exposed via the platform APIs.

As a consequence, use of the the IAccessible2 and
AT-SPI methods that use the child index remains
problematic in those cases where the child index
is larger. However, as an alternative to using the
AT-SPI Table interface and the IAccessibleTable/
IAccessibleTable2 interfaces with the child index
to retrieve information about a specific cell,
both AT-SPI and IAccessible2 also provide interfaces
to retrieve that information directly
from the cell object (TableCell interface for AT-SPI,
IAccessibleTableCell for IAccessible2).

Those interfaces are already implemented/exposed
for winaccessibility (s. `CAccTable`) and the
qt5/qt6/kf5 VCL plugins (s. the `QAccessibleTableCellInterface`
methods implemented in `QtAccessibleInterface`).
With the switch to 64-bit internal a11y child indices,
these now behave correctly for cells with a child
index that doesn't fit into 32 bit as well.

NVDA on Windows already uses the IAccessibleTableCell
interface and thus announcing focused cells works fine
with this change in place.

Orca on Linux currently doesn't make use of the AT-SPI
TableCell interface yet, but with a suggested change to
do so [1], announcement of selected cells works
with the qt6 VCL plugin with a current qtbase dev branch
as well - when combined with the suggested changes
to implement support for the AT-SPI TableCell interface
in Qt [2] [3] and the LO change based on that [4] and
a fix for a nullptr dereference [5].

The gtk3 VCL plugin doesn't expose the AT-SPI
TableCell interface yet, but once it does so
(via `AtkTableCell`), it also works with the
suggested Orca change [1] in place.
(Adding that is planned for an upcoming change,
works with a local WIP patch.)

For handling return values that are larger than what
platform APIs support, the following approach has
been chosen for now:

1) When the return value is for the count of
(selected) children, the maximum value N
supported by the platform API is returned.
(This is what `ScAccessibleTableBase::getAccessibleChildCount`
did previously.)
The first N elements can be accessed by their
actual (selection) indices.

2) When the return value is the child/cell index,
-2 is returned for objects whose index is greater
than the maximum value supported by the platform
API.
Using a non-negative value would mean that the
index would refer to *another* actually existing
child. A child index of -1 on the other hand
tends to be interpreted as "child is invalid" or
"object isn't actually a child of its (previous)
parent any more)". For the Orca case, this would
result in objects with a child index of -1
not being announced, as they are considered
"zombies" [6].

What's still somewhat problematic is the case where
more than 2^31 children are *selected*, since access
to those children still happens by the index into
the selection in the platform APIs, and not all
selected items are accessible this way.
(Screen readers usually just retrieve
the first and last element from the selection and
announce those.)

Orca already seems to apply different handling for the
case for fully selected rows and columns, so
"All cells selected" or "Columns ... to ... selected"
is announced just fine even if more than 2^31
cells are selected.

(Side note: While Microsoft User Interface
Automation - UIA - also uses 32-bit indices, it also
has specific methods in the ISelectionProvider2
interface that allow to explicitly retrieve the
first and last selected item,
`ISelectionProvider2::get_FirstSelectedItem` and
`ISelectionProvider2::get_LastSelectedItem`, but
we currently don't support UIA on Windows.)

Bound checks at the beginning of the methods from the
`XAccessibleContext`, `XAccessibleSelection` and
`XAccessibleTable` interfaces that take a child index
(or in helper methods called by those) should generally
already prevent too large indices from being passed to
the methods in the lower layer code that take smaller
integer types. Such bound checking has been
been added in various places where it wasn't present yet.
If there any remaining issues of this
kind that show after this commit, they can probably be
solved in a similar way (s.e.g. the change to
`AccessibleBrowseBox::getAccessibleChild` in this
commit).
A few asserts were also added at
places where my understanding is that values shouldn't
be larger than what is supported by a called method
anyway.

A test case will be added in a following change.

[1] https://gitlab.gnome.org/GNOME/orca/-/merge_requests/131
[2] https://codereview.qt-project.org/c/qt/qtbase/+/428566
[3] https://codereview.qt-project.org/c/qt/qtbase/+/428567
[4] https://gerrit.libreoffice.org/c/core/+/138750
[5] https://codereview.qt-project.org/c/qt/qtbase/+/430157
[6] 82c8542002/src/orca/script_utilities.py (L5155)

Change-Id: I3af590c988b0e6754fc72545918412f39e8fea07
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/139258
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>
2022-09-02 15:47:37 +02:00

615 lines
23 KiB
C++

/* -*- 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/accessiblewrapper.hxx>
#include <com/sun/star/accessibility/AccessibleEventId.hpp>
#include <com/sun/star/accessibility/AccessibleStateType.hpp>
using namespace ::comphelper;
using namespace ::com::sun::star::accessibility;
using namespace ::com::sun::star::uno;
using namespace ::com::sun::star::lang;
namespace comphelper
{
OWrappedAccessibleChildrenManager::OWrappedAccessibleChildrenManager( const Reference< XComponentContext >& _rxContext )
:m_xContext( _rxContext )
,m_bTransientChildren( true )
{
}
OWrappedAccessibleChildrenManager::~OWrappedAccessibleChildrenManager( )
{
}
void OWrappedAccessibleChildrenManager::setTransientChildren( bool _bSet )
{
m_bTransientChildren = _bSet;
}
void OWrappedAccessibleChildrenManager::setOwningAccessible( const Reference< XAccessible >& _rxAcc )
{
OSL_ENSURE( !m_aOwningAccessible.get().is(), "OWrappedAccessibleChildrenManager::setOwningAccessible: to be called only once!" );
m_aOwningAccessible = WeakReference< XAccessible >( _rxAcc );
}
void OWrappedAccessibleChildrenManager::removeFromCache( const Reference< XAccessible >& _rxKey )
{
AccessibleMap::iterator aRemovedPos = m_aChildrenMap.find( _rxKey );
if ( m_aChildrenMap.end() != aRemovedPos )
{ // it was cached
// remove ourself as event listener
Reference< XComponent > xComp( aRemovedPos->first, UNO_QUERY );
if( xComp.is() )
xComp->removeEventListener( this );
// and remove the entry from the map
m_aChildrenMap.erase( aRemovedPos );
}
}
void OWrappedAccessibleChildrenManager::invalidateAll( )
{
// remove as event listener from the map elements
for( const auto& rChild : m_aChildrenMap )
{
Reference< XComponent > xComp( rChild.first, UNO_QUERY );
if( xComp.is() )
xComp->removeEventListener( this );
}
// clear the map
AccessibleMap().swap(m_aChildrenMap);
}
Reference< XAccessible > OWrappedAccessibleChildrenManager::getAccessibleWrapperFor(
const Reference< XAccessible >& _rxKey )
{
rtl::Reference< OAccessibleWrapper > xValue;
if( !_rxKey.is() )
{
// fprintf( stderr, "It was this path that was crashing stuff\n" );
return xValue;
}
// do we have this child in the cache?
AccessibleMap::const_iterator aPos = m_aChildrenMap.find( _rxKey );
if ( m_aChildrenMap.end() != aPos )
{
xValue = aPos->second;
}
else
{ // not found in the cache, and allowed to create
// -> new wrapper
xValue = new OAccessibleWrapper( m_xContext, _rxKey, m_aOwningAccessible );
// see if we do cache children
if ( !m_bTransientChildren )
{
if (!m_aChildrenMap.emplace( _rxKey, xValue ).second)
{
OSL_FAIL(
"OWrappedAccessibleChildrenManager::"
"getAccessibleWrapperFor: element was already"
" inserted!" );
}
// listen for disposals of inner children - this may happen when the inner context
// is the owner for the inner children (it will dispose these children, and of course
// not our wrapper for these children)
Reference< XComponent > xComp( _rxKey, UNO_QUERY );
if ( xComp.is() )
xComp->addEventListener( this );
}
}
return xValue;
}
void OWrappedAccessibleChildrenManager::dispose()
{
// dispose our children
for( const auto& rChild : m_aChildrenMap )
{
Reference< XComponent > xComp( rChild.first, UNO_QUERY );
if( xComp.is() )
xComp->removeEventListener( this );
Reference< XComponent > xContextComponent;
if( rChild.second.is() )
xContextComponent.set( rChild.second->getContextNoCreate(),
::css::uno::UNO_QUERY );
if( xContextComponent.is() )
xContextComponent->dispose();
}
// clear our children
AccessibleMap().swap(m_aChildrenMap);
}
void OWrappedAccessibleChildrenManager::implTranslateChildEventValue( const Any& _rInValue, Any& _rOutValue )
{
_rOutValue.clear();
Reference< XAccessible > xChild;
if ( _rInValue >>= xChild )
_rOutValue <<= getAccessibleWrapperFor( xChild );
}
void OWrappedAccessibleChildrenManager::translateAccessibleEvent( const AccessibleEventObject& _rEvent, AccessibleEventObject& _rTranslatedEvent )
{
// just in case we can't translate some of the values:
_rTranslatedEvent.NewValue = _rEvent.NewValue;
_rTranslatedEvent.OldValue = _rEvent.OldValue;
switch ( _rEvent.EventId )
{
case AccessibleEventId::CHILD:
case AccessibleEventId::ACTIVE_DESCENDANT_CHANGED:
case AccessibleEventId::CONTROLLED_BY_RELATION_CHANGED:
case AccessibleEventId::CONTROLLER_FOR_RELATION_CHANGED:
case AccessibleEventId::LABEL_FOR_RELATION_CHANGED:
case AccessibleEventId::LABELED_BY_RELATION_CHANGED:
case AccessibleEventId::CONTENT_FLOWS_FROM_RELATION_CHANGED:
case AccessibleEventId::CONTENT_FLOWS_TO_RELATION_CHANGED:
// these are events where both the old and the new value contain child references
implTranslateChildEventValue( _rEvent.OldValue, _rTranslatedEvent.OldValue );
implTranslateChildEventValue( _rEvent.NewValue, _rTranslatedEvent.NewValue );
break;
case AccessibleEventId::NAME_CHANGED:
case AccessibleEventId::DESCRIPTION_CHANGED:
case AccessibleEventId::ACTION_CHANGED:
case AccessibleEventId::STATE_CHANGED:
case AccessibleEventId::BOUNDRECT_CHANGED:
case AccessibleEventId::INVALIDATE_ALL_CHILDREN:
case AccessibleEventId::SELECTION_CHANGED:
case AccessibleEventId::VISIBLE_DATA_CHANGED:
case AccessibleEventId::VALUE_CHANGED:
case AccessibleEventId::MEMBER_OF_RELATION_CHANGED:
case AccessibleEventId::CARET_CHANGED:
case AccessibleEventId::TEXT_CHANGED:
case AccessibleEventId::HYPERTEXT_CHANGED:
case AccessibleEventId::TABLE_CAPTION_CHANGED:
case AccessibleEventId::TABLE_COLUMN_DESCRIPTION_CHANGED:
case AccessibleEventId::TABLE_COLUMN_HEADER_CHANGED:
case AccessibleEventId::TABLE_MODEL_CHANGED:
case AccessibleEventId::TABLE_ROW_DESCRIPTION_CHANGED:
case AccessibleEventId::TABLE_ROW_HEADER_CHANGED:
case AccessibleEventId::TABLE_SUMMARY_CHANGED:
// these Ids are also missed: SUB_WINDOW_OF_RELATION_CHANGED & TEXT_ATTRIBUTE_CHANGED
case AccessibleEventId::TEXT_SELECTION_CHANGED:
// nothing to translate
break;
default:
OSL_FAIL( "OWrappedAccessibleChildrenManager::translateAccessibleEvent: unknown (or unexpected) event id!" );
break;
}
}
void OWrappedAccessibleChildrenManager::handleChildNotification( const AccessibleEventObject& _rEvent )
{
if ( AccessibleEventId::INVALIDATE_ALL_CHILDREN == _rEvent.EventId )
{ // clear our child map
invalidateAll( );
}
else if ( AccessibleEventId::CHILD == _rEvent.EventId )
{
// check if the removed or replaced element is cached
Reference< XAccessible > xRemoved;
if ( _rEvent.OldValue >>= xRemoved )
removeFromCache( xRemoved );
}
}
void SAL_CALL OWrappedAccessibleChildrenManager::disposing( const EventObject& _rSource )
{
// this should come from one of the inner XAccessible's of our children
Reference< XAccessible > xSource( _rSource.Source, UNO_QUERY );
AccessibleMap::iterator aDisposedPos = m_aChildrenMap.find( xSource );
#if OSL_DEBUG_LEVEL > 0
if ( m_aChildrenMap.end() == aDisposedPos )
{
OSL_FAIL( "OWrappedAccessibleChildrenManager::disposing: where did this come from?" );
// helper for diagnostics
Reference< XAccessible > xOwningAccessible( m_aOwningAccessible );
Reference< XAccessibleContext > xContext;
try
{
if ( xOwningAccessible.is() )
xContext = xOwningAccessible->getAccessibleContext();
if ( xContext.is() )
{
//TODO: do something
//OUString sName = xContext->getAccessibleName();
//OUString sDescription = xContext->getAccessibleDescription();
//sal_Int32 nPlaceYourBreakpointHere = 0;
}
}
catch( const Exception& /*e*/ )
{
// silent this, it's only diagnostics which failed
}
}
#endif
if ( m_aChildrenMap.end() != aDisposedPos )
{
m_aChildrenMap.erase( aDisposedPos );
}
}
OAccessibleWrapper::OAccessibleWrapper( const Reference< XComponentContext >& _rxContext,
const Reference< XAccessible >& _rxInnerAccessible, const Reference< XAccessible >& _rxParentAccessible )
:OAccessibleWrapper_Base( )
,OComponentProxyAggregation( _rxContext, Reference< XComponent >( _rxInnerAccessible, UNO_QUERY ) )
,m_xParentAccessible( _rxParentAccessible )
,m_xInnerAccessible( _rxInnerAccessible )
{
}
OAccessibleWrapper::~OAccessibleWrapper( )
{
if ( !m_rBHelper.bDisposed )
{
acquire(); // to prevent duplicate dtor calls
dispose();
}
}
IMPLEMENT_FORWARD_XTYPEPROVIDER2( OAccessibleWrapper, OComponentProxyAggregation, OAccessibleWrapper_Base )
IMPLEMENT_FORWARD_REFCOUNT( OAccessibleWrapper, OComponentProxyAggregation )
Any OAccessibleWrapper::queryInterface( const Type& _rType )
{
// #111089# instead of the inner XAccessible the proxy XAccessible must be returned
Any aReturn = OAccessibleWrapper_Base::queryInterface( _rType );
if ( !aReturn.hasValue() )
aReturn = OComponentProxyAggregation::queryInterface( _rType );
return aReturn;
}
Reference< XAccessibleContext > OAccessibleWrapper::getContextNoCreate( ) const
{
return m_aContext;
}
rtl::Reference<OAccessibleContextWrapper> OAccessibleWrapper::createAccessibleContext( const Reference< XAccessibleContext >& _rxInnerContext )
{
return new OAccessibleContextWrapper( getComponentContext(), _rxInnerContext, this, m_xParentAccessible );
}
Reference< XAccessibleContext > SAL_CALL OAccessibleWrapper::getAccessibleContext( )
{
// see if the context is still alive (we cache it)
Reference< XAccessibleContext > xContext = m_aContext;
if ( !xContext.is() )
{
// create a new context
Reference< XAccessibleContext > xInnerContext = m_xInnerAccessible->getAccessibleContext( );
if ( xInnerContext.is() )
{
xContext = createAccessibleContext( xInnerContext );
// cache it
m_aContext = WeakReference< XAccessibleContext >( xContext );
}
}
return xContext;
}
OAccessibleContextWrapperHelper::OAccessibleContextWrapperHelper(
const Reference< XComponentContext >& _rxContext,
::cppu::OBroadcastHelper& _rBHelper,
const Reference< XAccessibleContext >& _rxInnerAccessibleContext,
const Reference< XAccessible >& _rxOwningAccessible,
const Reference< XAccessible >& _rxParentAccessible )
:OComponentProxyAggregationHelper( _rxContext, _rBHelper )
,m_xInnerContext( _rxInnerAccessibleContext )
,m_xOwningAccessible( _rxOwningAccessible )
,m_xParentAccessible( _rxParentAccessible )
// initialize the mapper for our children
,m_xChildMapper( new OWrappedAccessibleChildrenManager( getComponentContext() ) )
{
// determine if we're allowed to cache children
sal_Int64 aStates = m_xInnerContext->getAccessibleStateSet( );
m_xChildMapper->setTransientChildren( aStates & AccessibleStateType::MANAGES_DESCENDANTS );
m_xChildMapper->setOwningAccessible( m_xOwningAccessible );
}
void OAccessibleContextWrapperHelper::aggregateProxy( oslInterlockedCount& _rRefCount, ::cppu::OWeakObject& _rDelegator )
{
Reference< XComponent > xInnerComponent( m_xInnerContext, UNO_QUERY );
OSL_ENSURE( xInnerComponent.is(), "OComponentProxyAggregation::aggregateProxy: accessible is no XComponent!" );
if ( xInnerComponent.is() )
componentAggregateProxyFor( xInnerComponent, _rRefCount, _rDelegator );
// add as event listener to the inner context, because we want to multiplex the AccessibleEvents
osl_atomic_increment( &_rRefCount );
{
Reference< XAccessibleEventBroadcaster > xBroadcaster( m_xInner, UNO_QUERY );
if ( xBroadcaster.is() )
xBroadcaster->addAccessibleEventListener( this );
}
osl_atomic_decrement( &_rRefCount );
}
OAccessibleContextWrapperHelper::~OAccessibleContextWrapperHelper( )
{
OSL_ENSURE( m_rBHelper.bDisposed, "OAccessibleContextWrapperHelper::~OAccessibleContextWrapperHelper: you should ensure (in your dtor) that the object is disposed!" );
}
Any SAL_CALL OAccessibleContextWrapperHelper::queryInterface( const Type& _rType )
{
Any aReturn = OComponentProxyAggregationHelper::queryInterface( _rType );
if ( !aReturn.hasValue() )
aReturn = OAccessibleContextWrapperHelper_Base::queryInterface( _rType );
return aReturn;
}
IMPLEMENT_FORWARD_XTYPEPROVIDER2( OAccessibleContextWrapperHelper, OComponentProxyAggregationHelper, OAccessibleContextWrapperHelper_Base )
sal_Int64 OAccessibleContextWrapperHelper::baseGetAccessibleChildCount( )
{
return m_xInnerContext->getAccessibleChildCount();
}
Reference< XAccessible > OAccessibleContextWrapperHelper::baseGetAccessibleChild( sal_Int64 i )
{
// get the child of the wrapped component
Reference< XAccessible > xInnerChild = m_xInnerContext->getAccessibleChild( i );
return m_xChildMapper->getAccessibleWrapperFor( xInnerChild );
}
Reference< XAccessibleRelationSet > OAccessibleContextWrapperHelper::baseGetAccessibleRelationSet( )
{
return m_xInnerContext->getAccessibleRelationSet();
// TODO: if this relation set would contain relations to siblings, we would normally need
// to wrap them, too...
}
void SAL_CALL OAccessibleContextWrapperHelper::notifyEvent( const AccessibleEventObject& _rEvent )
{
#if OSL_DEBUG_LEVEL > 0
if ( AccessibleEventId::STATE_CHANGED == _rEvent.EventId )
{
bool bChildTransienceChanged = false;
sal_Int64 nChangeState = 0;
if ( _rEvent.OldValue >>= nChangeState )
bChildTransienceChanged = bChildTransienceChanged || AccessibleStateType::MANAGES_DESCENDANTS == nChangeState;
if ( _rEvent.NewValue >>= nChangeState )
bChildTransienceChanged = bChildTransienceChanged || AccessibleStateType::MANAGES_DESCENDANTS == nChangeState;
OSL_ENSURE( !bChildTransienceChanged, "OAccessibleContextWrapperHelper::notifyEvent: MANAGES_DESCENDANTS is not expected to change during runtime!" );
// if this asserts, then we would need to update our m_bTransientChildren flag here,
// as well as (potentially) our child cache
}
#endif
AccessibleEventObject aTranslatedEvent( _rEvent );
{
::osl::MutexGuard aGuard( m_rBHelper.rMutex );
// translate the event
queryInterface( cppu::UnoType<XInterface>::get() ) >>= aTranslatedEvent.Source;
m_xChildMapper->translateAccessibleEvent( _rEvent, aTranslatedEvent );
// see if any of these notifications affect our child manager
m_xChildMapper->handleChildNotification( _rEvent );
if ( aTranslatedEvent.NewValue == m_xInner )
aTranslatedEvent.NewValue <<= aTranslatedEvent.Source;
if ( aTranslatedEvent.OldValue == m_xInner )
aTranslatedEvent.OldValue <<= aTranslatedEvent.Source;
}
notifyTranslatedEvent( aTranslatedEvent );
}
void SAL_CALL OAccessibleContextWrapperHelper::dispose()
{
::osl::MutexGuard aGuard( m_rBHelper.rMutex );
// stop multiplexing events
Reference< XAccessibleEventBroadcaster > xBroadcaster( m_xInner, UNO_QUERY );
OSL_ENSURE( xBroadcaster.is(), "OAccessibleContextWrapperHelper::disposing(): inner context is no broadcaster!" );
if ( xBroadcaster.is() )
xBroadcaster->removeAccessibleEventListener( this );
// dispose the child cache/map
m_xChildMapper->dispose();
// let the base class dispose the inner component
OComponentProxyAggregationHelper::dispose();
}
void SAL_CALL OAccessibleContextWrapperHelper::disposing( const EventObject& _rEvent )
{
// simply disambiguate this
OComponentProxyAggregationHelper::disposing( _rEvent );
}
IMPLEMENT_FORWARD_XINTERFACE2( OAccessibleContextWrapper, OAccessibleContextWrapper_CBase, OAccessibleContextWrapperHelper )
IMPLEMENT_FORWARD_XTYPEPROVIDER2( OAccessibleContextWrapper, OAccessibleContextWrapper_CBase, OAccessibleContextWrapperHelper )
OAccessibleContextWrapper::OAccessibleContextWrapper( const Reference< XComponentContext >& _rxContext,
const Reference< XAccessibleContext >& _rxInnerAccessibleContext, const Reference< XAccessible >& _rxOwningAccessible,
const Reference< XAccessible >& _rxParentAccessible )
:OAccessibleContextWrapper_CBase( m_aMutex )
,OAccessibleContextWrapperHelper( _rxContext, rBHelper, _rxInnerAccessibleContext, _rxOwningAccessible, _rxParentAccessible )
,m_nNotifierClient( 0 )
{
aggregateProxy( m_refCount, *this );
}
OAccessibleContextWrapper::~OAccessibleContextWrapper()
{
}
sal_Int64 SAL_CALL OAccessibleContextWrapper::getAccessibleChildCount( )
{
return baseGetAccessibleChildCount();
}
Reference< XAccessible > SAL_CALL OAccessibleContextWrapper::getAccessibleChild( sal_Int64 i )
{
return baseGetAccessibleChild( i );
}
Reference< XAccessible > SAL_CALL OAccessibleContextWrapper::getAccessibleParent( )
{
return m_xParentAccessible;
}
sal_Int64 SAL_CALL OAccessibleContextWrapper::getAccessibleIndexInParent( )
{
return m_xInnerContext->getAccessibleIndexInParent();
}
sal_Int16 SAL_CALL OAccessibleContextWrapper::getAccessibleRole( )
{
return m_xInnerContext->getAccessibleRole();
}
OUString SAL_CALL OAccessibleContextWrapper::getAccessibleDescription( )
{
return m_xInnerContext->getAccessibleDescription();
}
OUString SAL_CALL OAccessibleContextWrapper::getAccessibleName( )
{
return m_xInnerContext->getAccessibleName();
}
Reference< XAccessibleRelationSet > SAL_CALL OAccessibleContextWrapper::getAccessibleRelationSet( )
{
return baseGetAccessibleRelationSet();
}
sal_Int64 SAL_CALL OAccessibleContextWrapper::getAccessibleStateSet( )
{
return m_xInnerContext->getAccessibleStateSet();
}
Locale SAL_CALL OAccessibleContextWrapper::getLocale( )
{
return m_xInnerContext->getLocale();
}
void OAccessibleContextWrapper::notifyTranslatedEvent( const AccessibleEventObject& _rEvent )
{
if ( m_nNotifierClient )
AccessibleEventNotifier::addEvent( m_nNotifierClient, _rEvent );
}
void SAL_CALL OAccessibleContextWrapper::addAccessibleEventListener( const Reference< XAccessibleEventListener >& _rxListener )
{
::osl::MutexGuard aGuard( m_aMutex );
if ( !m_nNotifierClient )
m_nNotifierClient = AccessibleEventNotifier::registerClient( );
AccessibleEventNotifier::addEventListener( m_nNotifierClient, _rxListener );
}
void SAL_CALL OAccessibleContextWrapper::removeAccessibleEventListener( const Reference< XAccessibleEventListener >& _rxListener )
{
::osl::MutexGuard aGuard( m_aMutex );
if ( m_nNotifierClient )
{
if ( 0 == AccessibleEventNotifier::removeEventListener( m_nNotifierClient, _rxListener ) )
{
AccessibleEventNotifier::TClientId nId( m_nNotifierClient );
m_nNotifierClient = 0;
AccessibleEventNotifier::revokeClient( nId );
}
}
}
void SAL_CALL OAccessibleContextWrapper::disposing()
{
AccessibleEventNotifier::TClientId nClientId( 0 );
// --- <mutex lock> -----------------------------------------
{
::osl::MutexGuard aGuard( m_aMutex );
// prepare notifying our AccessibleListeners
if ( m_nNotifierClient )
{
nClientId = m_nNotifierClient;
m_nNotifierClient = 0;
}
}
// --- </mutex lock> -----------------------------------------
// let the base class do
OAccessibleContextWrapperHelper::dispose();
// notify the disposal
if ( nClientId )
AccessibleEventNotifier::revokeClientNotifyDisposing( nClientId, *this );
}
} // namespace accessibility
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */