e36e5dcc90
Change-Id: Iabc7293370c7a8b3fdccb00d6e1cdbfac4c46992 Reviewed-on: https://gerrit.libreoffice.org/39445 Tested-by: Jenkins <ci@libreoffice.org> Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
217 lines
8.8 KiB
C++
217 lines
8.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#ifndef INCLUDED_COMPHELPER_ACCESSIBLECONTEXTHELPER_HXX
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#define INCLUDED_COMPHELPER_ACCESSIBLECONTEXTHELPER_HXX
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#include <cppuhelper/compbase2.hxx>
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#include <cppuhelper/basemutex.hxx>
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#include <com/sun/star/accessibility/XAccessibleContext.hpp>
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#include <com/sun/star/accessibility/XAccessibleEventBroadcaster.hpp>
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#include <com/sun/star/lang/DisposedException.hpp>
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#include <comphelper/comphelperdllapi.h>
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#include <comphelper/solarmutex.hxx>
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#include <memory>
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namespace comphelper
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{
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//= OAccessibleContextHelper
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class OContextHelper_Impl;
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typedef ::cppu::WeakAggComponentImplHelper2 < css::accessibility::XAccessibleContext,
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css::accessibility::XAccessibleEventBroadcaster
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> OAccessibleContextHelper_Base;
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/** helper class for implementing an AccessibleContext
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*/
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class COMPHELPER_DLLPUBLIC OAccessibleContextHelper
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:public ::cppu::BaseMutex
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,public OAccessibleContextHelper_Base
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{
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friend class OContextEntryGuard;
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private:
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std::unique_ptr<OContextHelper_Impl> m_pImpl;
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protected:
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virtual ~OAccessibleContextHelper( ) override;
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OAccessibleContextHelper( );
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/** late construction
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@param _rxAccessible
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the Accessible object which created this context.
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<p>If your derived implementation implements the XAccessible (and does not follow the proposed
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separation of XAccessible from XAccessibleContext), you may pass <code>this</code> here.</p>
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<p>The object is hold weak, so its life time is not affected.</p>
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<p>The object is needed for performance reasons: for <method>getAccessibleIndexInParent</method>,
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all children (which are XAccessible's theirself) of our parent have to be asked. If we know our
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XAccessible, we can compare it with all the children, instead of asking all children for their
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context and comparing this context with ourself.</p>
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*/
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void lateInit( const css::uno::Reference< css::accessibility::XAccessible >& _rxAccessible );
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/** retrieves the creator previously set with <method>lateInit</method>
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*/
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css::uno::Reference< css::accessibility::XAccessible >
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getAccessibleCreator( ) const;
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public:
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// XAccessibleEventBroadcaster
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virtual void SAL_CALL addAccessibleEventListener( const css::uno::Reference< css::accessibility::XAccessibleEventListener >& xListener ) override;
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virtual void SAL_CALL removeAccessibleEventListener( const css::uno::Reference< css::accessibility::XAccessibleEventListener >& xListener ) override;
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// XAccessibleContext - still waiting to be overwritten
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virtual sal_Int32 SAL_CALL getAccessibleChildCount( ) override = 0;
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virtual css::uno::Reference< css::accessibility::XAccessible > SAL_CALL getAccessibleChild( sal_Int32 i ) override = 0;
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virtual css::uno::Reference< css::accessibility::XAccessible > SAL_CALL getAccessibleParent( ) override = 0;
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virtual sal_Int16 SAL_CALL getAccessibleRole( ) override = 0;
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virtual OUString SAL_CALL getAccessibleDescription( ) override = 0;
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virtual OUString SAL_CALL getAccessibleName( ) override = 0;
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virtual css::uno::Reference< css::accessibility::XAccessibleRelationSet > SAL_CALL getAccessibleRelationSet( ) override = 0;
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virtual css::uno::Reference< css::accessibility::XAccessibleStateSet > SAL_CALL getAccessibleStateSet( ) override = 0;
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// XAccessibleContext - default implementations
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/** default implementation for retrieving the index of this object within the parent
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<p>This basic implementation here returns the index <code>i</code> of the child for which
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<code><parent>.getAccessibleChild( i )</code> equals our creator.</p>
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*/
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virtual sal_Int32 SAL_CALL getAccessibleIndexInParent( ) override;
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/** default implementation for retrieving the locale
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<p>This basic implementation returns the locale of the parent context,
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as retrieved via getAccessibleParent()->getAccessibleContext.</p>
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*/
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virtual css::lang::Locale SAL_CALL getLocale( ) override;
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protected:
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// OComponentHelper
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virtual void SAL_CALL disposing() override;
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protected:
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// helper
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/** notifies all AccessibleEventListeners of a certain event
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@precond not to be called with our mutex locked
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@param _nEventId
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the id of the event. See AccessibleEventType
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@param _rOldValue
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the old value to be notified
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@param _rNewValue
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the new value to be notified
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*/
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void NotifyAccessibleEvent(
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const sal_Int16 _nEventId,
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const css::uno::Any& _rOldValue,
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const css::uno::Any& _rNewValue
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);
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// life time control
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/// checks whether the object is alive (returns <TRUE/> then) or disposed
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bool isAlive() const;
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/// checks for being alive. If the object is already disposed (i.e. not alive), an exception is thrown.
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void ensureAlive() const;
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/** ensures that the object is disposed.
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@precond
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to be called from within the destructor of your derived class only!
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*/
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void ensureDisposed( );
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/** shortcut for retrieving the context of the parent (returned by getAccessibleParent)
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*/
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css::uno::Reference< css::accessibility::XAccessibleContext >
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implGetParentContext();
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// access to the base class' broadcast helper/mutex
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::osl::Mutex& GetMutex() { return m_aMutex; }
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};
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//= OContextEntryGuard
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/** helper class for guarding the entry into OAccessibleContextHelper methods.
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<p>The class has two responsibilities:
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<ul><li>it locks the mutex of an OAccessibleContextHelper instance, as long as the guard lives</li>
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<li>it checks if an given OAccessibleContextHelper instance is alive, else an exception is thrown
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our of the constructor of the guard</li>
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</ul>
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<br/>
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This makes it your first choice (hopefully :) for guarding any interface method implementations of
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you derived class.
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</p>
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*/
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class OContextEntryGuard : public ::osl::ClearableMutexGuard
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{
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public:
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/** constructs the guard
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<p>The given context (it's mutex, respectively) is locked, and an exception is thrown if the context
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is not alive anymore. In the latter case, of course, the mutex is freed, again.</p>
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@param _pContext
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the context which shall be guarded
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@precond <arg>_pContext</arg> != NULL
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*/
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inline OContextEntryGuard( OAccessibleContextHelper* _pContext );
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};
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inline OContextEntryGuard::OContextEntryGuard( OAccessibleContextHelper* _pContext )
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: ::osl::ClearableMutexGuard( _pContext->GetMutex() )
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{
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_pContext->ensureAlive();
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}
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//= OExternalLockGuard
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class OExternalLockGuard
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:public osl::Guard<SolarMutex>
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,public OContextEntryGuard
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{
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public:
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inline OExternalLockGuard( OAccessibleContextHelper* _pContext );
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};
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inline OExternalLockGuard::OExternalLockGuard( OAccessibleContextHelper* _pContext )
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:osl::Guard<SolarMutex>( SolarMutex::get() )
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,OContextEntryGuard( _pContext )
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{
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// Only lock the external mutex,
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// release the ::osl::Mutex of the OAccessibleContextHelper instance.
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// If you call into another UNO object with locked ::osl::Mutex,
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// this may lead to dead locks.
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clear();
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}
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} // namespace comphelper
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#endif // INCLUDED_COMPHELPER_ACCESSIBLECONTEXTHELPER_HXX
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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