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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 <editeng/AccessibleContextBase.hxx>
#include <com/sun/star/accessibility/AccessibleRole.hpp>
#include <com/sun/star/beans/PropertyChangeEvent.hpp>
#include <com/sun/star/accessibility/XAccessibleEventListener.hpp>
#include <com/sun/star/accessibility/AccessibleStateType.hpp>
#include <com/sun/star/accessibility/AccessibleRelationType.hpp>
#include <unotools/accessiblestatesethelper.hxx>
#include <unotools/accessiblerelationsethelper.hxx>
#include <comphelper/accessibleeventnotifier.hxx>
#include <cppuhelper/supportsservice.hxx>
#include <osl/mutex.hxx>
#include <utility>
using namespace ::com::sun::star;
using namespace ::com::sun::star::accessibility;
namespace accessibility {
// internal
AccessibleContextBase::AccessibleContextBase (
const uno::Reference<XAccessible>& rxParent,
const sal_Int16 aRole)
: WeakComponentImplHelper(MutexOwner::maMutex),
mxParent(rxParent),
msDescription(),
meDescriptionOrigin(NotSet),
msName(),
meNameOrigin(NotSet),
mnClientId(0),
maRole(aRole)
{
// Create the state set.
::utl::AccessibleStateSetHelper* pStateSet = new ::utl::AccessibleStateSetHelper ();
mxStateSet = pStateSet;
// Set some states. Don't use the SetState method because no events
// shall be broadcasted (that is not yet initialized anyway).
pStateSet->AddState (AccessibleStateType::ENABLED);
pStateSet->AddState (AccessibleStateType::SENSITIVE);
pStateSet->AddState (AccessibleStateType::SHOWING);
pStateSet->AddState (AccessibleStateType::VISIBLE);
pStateSet->AddState (AccessibleStateType::FOCUSABLE);
pStateSet->AddState (AccessibleStateType::SELECTABLE);
// Create the relation set.
::utl::AccessibleRelationSetHelper* pRelationSet = new ::utl::AccessibleRelationSetHelper ();
mxRelationSet = pRelationSet;
}
AccessibleContextBase::~AccessibleContextBase()
{
}
bool AccessibleContextBase::SetState (sal_Int16 aState)
{
::osl::ClearableMutexGuard aGuard (maMutex);
::utl::AccessibleStateSetHelper* pStateSet =
static_cast< ::utl::AccessibleStateSetHelper*>(mxStateSet.get());
if ((pStateSet != nullptr) && !pStateSet->contains(aState))
{
pStateSet->AddState (aState);
// Clear the mutex guard so that it is not locked during calls to
// listeners.
aGuard.clear();
// Send event for all states except the DEFUNC state.
if (aState != AccessibleStateType::DEFUNC)
{
uno::Any aNewValue;
aNewValue <<= aState;
CommitChange(
AccessibleEventId::STATE_CHANGED,
aNewValue,
uno::Any());
}
return true;
}
else
return false;
}
bool AccessibleContextBase::ResetState (sal_Int16 aState)
{
::osl::ClearableMutexGuard aGuard (maMutex);
::utl::AccessibleStateSetHelper* pStateSet =
static_cast< ::utl::AccessibleStateSetHelper*>(mxStateSet.get());
if ((pStateSet != nullptr) && pStateSet->contains(aState))
{
pStateSet->RemoveState (aState);
// Clear the mutex guard so that it is not locked during calls to listeners.
aGuard.clear();
uno::Any aOldValue;
aOldValue <<= aState;
CommitChange(
AccessibleEventId::STATE_CHANGED,
uno::Any(),
aOldValue);
return true;
}
else
return false;
}
bool AccessibleContextBase::GetState (sal_Int16 aState)
{
::osl::MutexGuard aGuard (maMutex);
::utl::AccessibleStateSetHelper* pStateSet =
static_cast< ::utl::AccessibleStateSetHelper*>(mxStateSet.get());
if (pStateSet != nullptr)
return pStateSet->contains(aState);
else
// If there is no state set then return false as a default value.
return false;
}
void AccessibleContextBase::SetRelationSet (
const uno::Reference<XAccessibleRelationSet>& rxNewRelationSet)
{
// Try to emit some meaningful events indicating differing relations in
// both sets.
typedef std::pair<short int,short int> RD;
const RD aRelationDescriptors[] = {
RD(AccessibleRelationType::CONTROLLED_BY, AccessibleEventId::CONTROLLED_BY_RELATION_CHANGED),
RD(AccessibleRelationType::CONTROLLER_FOR, AccessibleEventId::CONTROLLER_FOR_RELATION_CHANGED),
RD(AccessibleRelationType::LABELED_BY, AccessibleEventId::LABELED_BY_RELATION_CHANGED),
RD(AccessibleRelationType::LABEL_FOR, AccessibleEventId::LABEL_FOR_RELATION_CHANGED),
RD(AccessibleRelationType::MEMBER_OF, AccessibleEventId::MEMBER_OF_RELATION_CHANGED),
RD(AccessibleRelationType::INVALID, -1),
};
for (int i=0; aRelationDescriptors[i].first!=AccessibleRelationType::INVALID; i++)
if (mxRelationSet->containsRelation(aRelationDescriptors[i].first)
!= rxNewRelationSet->containsRelation(aRelationDescriptors[i].first))
CommitChange (aRelationDescriptors[i].second, uno::Any(), uno::Any());
mxRelationSet = rxNewRelationSet;
}
// XAccessible
uno::Reference< XAccessibleContext> SAL_CALL
AccessibleContextBase::getAccessibleContext()
{
return this;
}
// XAccessibleContext
/** No children.
*/
sal_Int32 SAL_CALL
AccessibleContextBase::getAccessibleChildCount()
{
return 0;
}
/** Forward the request to the shape. Return the requested shape or throw
an exception for a wrong index.
*/
uno::Reference<XAccessible> SAL_CALL
AccessibleContextBase::getAccessibleChild (sal_Int32 nIndex)
{
ThrowIfDisposed ();
throw lang::IndexOutOfBoundsException (
"no child with index " + OUString::number(nIndex),
nullptr);
}
uno::Reference<XAccessible> SAL_CALL
AccessibleContextBase::getAccessibleParent()
{
ThrowIfDisposed ();
return mxParent;
}
sal_Int32 SAL_CALL
AccessibleContextBase::getAccessibleIndexInParent()
{
ThrowIfDisposed ();
// Use a simple but slow solution for now. Optimize later.
// Iterate over all the parent's children and search for this object.
if (mxParent.is())
{
uno::Reference<XAccessibleContext> xParentContext (
mxParent->getAccessibleContext());
if (xParentContext.is())
{
sal_Int32 nChildCount = xParentContext->getAccessibleChildCount();
for (sal_Int32 i=0; i<nChildCount; i++)
{
uno::Reference<XAccessible> xChild (xParentContext->getAccessibleChild (i));
if (xChild.is())
{
uno::Reference<XAccessibleContext> xChildContext = xChild->getAccessibleContext();
if (xChildContext == static_cast<XAccessibleContext*>(this))
return i;
}
}
}
}
// Return -1 to indicate that this object's parent does not know about the
// object.
return -1;
}
sal_Int16 SAL_CALL
AccessibleContextBase::getAccessibleRole()
{
ThrowIfDisposed ();
return maRole;
}
OUString SAL_CALL
AccessibleContextBase::getAccessibleDescription()
{
ThrowIfDisposed ();
return msDescription;
}
OUString SAL_CALL
AccessibleContextBase::getAccessibleName()
{
ThrowIfDisposed ();
if (meNameOrigin == NotSet)
{
// Do not send an event because this is the first time it has been
// requested.
msName = CreateAccessibleName();
meNameOrigin = AutomaticallyCreated;
}
return msName;
}
/** Return a copy of the relation set.
*/
uno::Reference<XAccessibleRelationSet> SAL_CALL
AccessibleContextBase::getAccessibleRelationSet()
{
ThrowIfDisposed ();
// Create a copy of the relation set and return it.
::utl::AccessibleRelationSetHelper* pRelationSet =
static_cast< ::utl::AccessibleRelationSetHelper*>(mxRelationSet.get());
if (pRelationSet != nullptr)
{
return uno::Reference<XAccessibleRelationSet> (
new ::utl::AccessibleRelationSetHelper (*pRelationSet));
}
else
return uno::Reference<XAccessibleRelationSet>(nullptr);
}
/** Return a copy of the state set.
Possible states are:
ENABLED
SHOWING
VISIBLE
*/
uno::Reference<XAccessibleStateSet> SAL_CALL
AccessibleContextBase::getAccessibleStateSet()
{
::utl::AccessibleStateSetHelper* pStateSet = nullptr;
if (rBHelper.bDisposed)
{
// We are already disposed!
// Create a new state set that has only set the DEFUNC state.
pStateSet = new ::utl::AccessibleStateSetHelper ();
pStateSet->AddState (AccessibleStateType::DEFUNC);
}
else
{
// Create a copy of the state set and return it.
pStateSet = static_cast< ::utl::AccessibleStateSetHelper*>(mxStateSet.get());
if (pStateSet != nullptr)
pStateSet = new ::utl::AccessibleStateSetHelper (*pStateSet);
}
return uno::Reference<XAccessibleStateSet>(pStateSet);
}
lang::Locale SAL_CALL
AccessibleContextBase::getLocale()
{
ThrowIfDisposed ();
// Delegate request to parent.
if (mxParent.is())
{
uno::Reference<XAccessibleContext> xParentContext (
mxParent->getAccessibleContext());
if (xParentContext.is())
return xParentContext->getLocale ();
}
// No locale and no parent. Therefore throw exception to indicate this
// cluelessness.
throw IllegalAccessibleComponentStateException ();
}
// XAccessibleEventListener
void SAL_CALL AccessibleContextBase::addAccessibleEventListener (
const uno::Reference<XAccessibleEventListener >& rxListener)
{
if (rxListener.is())
{
if (rBHelper.bDisposed || rBHelper.bInDispose)
{
uno::Reference<uno::XInterface> x (static_cast<lang::XComponent *>(this), uno::UNO_QUERY);
rxListener->disposing (lang::EventObject (x));
}
else
{
if (!mnClientId)
mnClientId = comphelper::AccessibleEventNotifier::registerClient( );
comphelper::AccessibleEventNotifier::addEventListener( mnClientId, rxListener );
}
}
}
void SAL_CALL AccessibleContextBase::removeAccessibleEventListener (
const uno::Reference<XAccessibleEventListener >& rxListener )
{
ThrowIfDisposed ();
if (rxListener.is() && mnClientId)
{
sal_Int32 nListenerCount = comphelper::AccessibleEventNotifier::removeEventListener( mnClientId, 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
comphelper::AccessibleEventNotifier::revokeClient( mnClientId );
mnClientId = 0;
}
}
}
// XServiceInfo
OUString SAL_CALL AccessibleContextBase::getImplementationName()
{
return OUString("AccessibleContextBase");
}
sal_Bool SAL_CALL AccessibleContextBase::supportsService (const OUString& sServiceName)
{
return cppu::supportsService(this, sServiceName);
}
uno::Sequence< OUString > SAL_CALL
AccessibleContextBase::getSupportedServiceNames()
{
return {
"com.sun.star.accessibility.Accessible",
"com.sun.star.accessibility.AccessibleContext"};
}
// XTypeProvider
uno::Sequence<sal_Int8> SAL_CALL
AccessibleContextBase::getImplementationId()
{
return css::uno::Sequence<sal_Int8>();
}
// internal
void SAL_CALL AccessibleContextBase::disposing()
{
SetState (AccessibleStateType::DEFUNC);
::osl::MutexGuard aGuard (maMutex);
// Send a disposing to all listeners.
if ( mnClientId )
{
comphelper::AccessibleEventNotifier::revokeClientNotifyDisposing( mnClientId, *this );
mnClientId = 0;
}
}
void AccessibleContextBase::SetAccessibleDescription (
const OUString& rDescription,
StringOrigin eDescriptionOrigin)
{
if (eDescriptionOrigin < meDescriptionOrigin
|| (eDescriptionOrigin == meDescriptionOrigin && msDescription != rDescription))
{
uno::Any aOldValue, aNewValue;
aOldValue <<= msDescription;
aNewValue <<= rDescription;
msDescription = rDescription;
meDescriptionOrigin = eDescriptionOrigin;
CommitChange(
AccessibleEventId::DESCRIPTION_CHANGED,
aNewValue,
aOldValue);
}
}
void AccessibleContextBase::SetAccessibleName (
const OUString& rName,
StringOrigin eNameOrigin)
{
if (eNameOrigin < meNameOrigin
|| (eNameOrigin == meNameOrigin && msName != rName))
{
uno::Any aOldValue, aNewValue;
aOldValue <<= msName;
aNewValue <<= rName;
msName = rName;
meNameOrigin = eNameOrigin;
CommitChange(
AccessibleEventId::NAME_CHANGED,
aNewValue,
aOldValue);
}
}
OUString AccessibleContextBase::CreateAccessibleName()
{
return OUString("Empty Name");
}
void AccessibleContextBase::CommitChange (
sal_Int16 nEventId,
const uno::Any& rNewValue,
const uno::Any& rOldValue)
{
// Do not call FireEvent and do not even create the event object when no
// listener has been registered yet. Creating the event object can
// otherwise lead to a crash. See issue 93419 for details.
if (mnClientId != 0)
{
AccessibleEventObject aEvent (
static_cast<XAccessibleContext*>(this),
nEventId,
rNewValue,
rOldValue);
FireEvent (aEvent);
}
}
void AccessibleContextBase::FireEvent (const AccessibleEventObject& aEvent)
{
if (mnClientId)
comphelper::AccessibleEventNotifier::addEvent( mnClientId, aEvent );
}
void AccessibleContextBase::ThrowIfDisposed()
{
if (rBHelper.bDisposed || rBHelper.bInDispose)
{
throw lang::DisposedException ("object has been already disposed",
static_cast<uno::XWeak*>(this));
}
}
bool AccessibleContextBase::IsDisposed()
{
return (rBHelper.bDisposed || rBHelper.bInDispose);
}
void AccessibleContextBase::SetAccessibleRole( sal_Int16 _nRole )
{
maRole = _nRole;
}
} // end of namespace accessibility
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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