Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 248 insertions, 0 deletions

diff --git a/comphelper/source/misc/accessiblecontexthelper.cxx b/comphelper/source/misc/accessiblecontexthelper.cxx
new file mode 100644
index 000000000..ad2c63b1a
--- /dev/null
+++ b/comphelper/source/misc/accessiblecontexthelper.cxx
@@ -0,0 +1,248 @@
+/* -*- 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
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */