278 lines
11 KiB
C++
278 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2000, 2010 Oracle and/or its affiliates.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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#include <toolkit/helper/accessibilityclient.hxx>
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#include <toolkit/helper/accessiblefactory.hxx>
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#include <osl/module.h>
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#include <osl/diagnose.h>
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#include <tools/solar.h>
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// #define UNLOAD_ON_LAST_CLIENT_DYING
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// this is not recommended currently. If enabled, the implementation will log
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// the number of active clients, and unload the acc library when the last client
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// goes away.
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// Sounds like a good idea, unfortunately, there's no guarantee that all objects
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// implemented in this library are already dead.
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// Iow, just because an object implementing an XAccessible (implemented in this lib
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// here) died, it's not said that everybody released all references to the
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// XAccessibleContext used by this component, and implemented in the acc lib.
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// So we cannot really unload the lib.
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//
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// Alternatively, if the lib would us own "usage counting", i.e. every component
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// implemented therein would affect a static ref count, the acc lib could care
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// for unloading itself.
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//........................................................................
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namespace toolkit
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{
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//........................................................................
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using namespace ::com::sun::star::uno;
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using namespace ::com::sun::star::accessibility;
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namespace
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{
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#ifdef UNLOAD_ON_LAST_CLIENT_DYING
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static oslInterlockedCount s_nAccessibilityClients = 0;
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#endif // UNLOAD_ON_LAST_CLIENT_DYING
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static oslModule s_hAccessibleImplementationModule = NULL;
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static GetStandardAccComponentFactory s_pAccessibleFactoryFunc = NULL;
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static ::rtl::Reference< IAccessibleFactory > s_pFactory;
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}
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//====================================================================
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//= AccessibleDummyFactory
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//====================================================================
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class AccessibleDummyFactory : public IAccessibleFactory
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{
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public:
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AccessibleDummyFactory();
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protected:
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virtual ~AccessibleDummyFactory();
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private:
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AccessibleDummyFactory( const AccessibleDummyFactory& ); // never implemented
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AccessibleDummyFactory& operator=( const AccessibleDummyFactory& ); // never implemented
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oslInterlockedCount m_refCount;
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public:
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// IReference
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virtual oslInterlockedCount SAL_CALL acquire();
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virtual oslInterlockedCount SAL_CALL release();
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// IAccessibleFactory
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::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
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createAccessibleContext( VCLXButton* /*_pXWindow*/ )
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{
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return NULL;
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}
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::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
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createAccessibleContext( VCLXCheckBox* /*_pXWindow*/ )
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{
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return NULL;
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}
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::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
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createAccessibleContext( VCLXRadioButton* /*_pXWindow*/ )
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{
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return NULL;
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}
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::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
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createAccessibleContext( VCLXListBox* /*_pXWindow*/ )
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{
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return NULL;
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}
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::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
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createAccessibleContext( VCLXFixedHyperlink* /*_pXWindow*/ )
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{
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return NULL;
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}
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::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
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createAccessibleContext( VCLXFixedText* /*_pXWindow*/ )
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{
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return NULL;
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}
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::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
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createAccessibleContext( VCLXScrollBar* /*_pXWindow*/ )
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{
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return NULL;
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}
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::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
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createAccessibleContext( VCLXEdit* /*_pXWindow*/ )
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{
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return NULL;
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}
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::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
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createAccessibleContext( VCLXComboBox* /*_pXWindow*/ )
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{
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return NULL;
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}
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::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
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createAccessibleContext( VCLXToolBox* /*_pXWindow*/ )
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{
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return NULL;
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}
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::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
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createAccessibleContext( VCLXWindow* /*_pXWindow*/ )
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{
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return NULL;
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}
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::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessible >
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createAccessible( Menu* /*_pMenu*/, sal_Bool /*_bIsMenuBar*/ )
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{
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return NULL;
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}
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};
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//--------------------------------------------------------------------
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AccessibleDummyFactory::AccessibleDummyFactory()
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{
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}
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//--------------------------------------------------------------------
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AccessibleDummyFactory::~AccessibleDummyFactory()
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{
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}
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//--------------------------------------------------------------------
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oslInterlockedCount SAL_CALL AccessibleDummyFactory::acquire()
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{
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return osl_incrementInterlockedCount( &m_refCount );
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}
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//--------------------------------------------------------------------
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oslInterlockedCount SAL_CALL AccessibleDummyFactory::release()
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{
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if ( 0 == osl_decrementInterlockedCount( &m_refCount ) )
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{
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delete this;
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return 0;
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}
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return m_refCount;
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}
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//====================================================================
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//= AccessibilityClient
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//====================================================================
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//--------------------------------------------------------------------
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AccessibilityClient::AccessibilityClient()
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:m_bInitialized( false )
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{
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}
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//--------------------------------------------------------------------
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extern "C" { static void SAL_CALL thisModule() {} }
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void AccessibilityClient::ensureInitialized()
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{
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if ( m_bInitialized )
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return;
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::osl::MutexGuard aGuard( ::osl::Mutex::getGlobalMutex() );
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#ifdef UNLOAD_ON_LAST_CLIENT_DYING
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if ( 1 == osl_incrementInterlockedCount( &s_nAccessibilityClients ) )
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{ // the first client
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#endif // UNLOAD_ON_LAST_CLIENT_DYING
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// load the library implementing the factory
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if ( !s_pFactory.get() )
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{
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const ::rtl::OUString sModuleName(RTL_CONSTASCII_USTRINGPARAM(
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SVLIBRARY( "acc" ))
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);
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s_hAccessibleImplementationModule = osl_loadModuleRelative( &thisModule, sModuleName.pData, 0 );
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if ( s_hAccessibleImplementationModule != NULL )
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{
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const ::rtl::OUString sFactoryCreationFunc =
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::rtl::OUString(RTL_CONSTASCII_USTRINGPARAM("getStandardAccessibleFactory"));
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s_pAccessibleFactoryFunc = (GetStandardAccComponentFactory)
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osl_getFunctionSymbol( s_hAccessibleImplementationModule, sFactoryCreationFunc.pData );
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}
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OSL_ENSURE( s_pAccessibleFactoryFunc, "AccessibilityClient::ensureInitialized: could not load the library, or not retrieve the needed symbol!" );
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// get a factory instance
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if ( s_pAccessibleFactoryFunc )
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{
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IAccessibleFactory* pFactory = static_cast< IAccessibleFactory* >( (*s_pAccessibleFactoryFunc)() );
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OSL_ENSURE( pFactory, "AccessibilityClient::ensureInitialized: no factory provided by the A11Y lib!" );
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if ( pFactory )
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{
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s_pFactory = pFactory;
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pFactory->release();
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}
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}
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}
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if ( !s_pFactory.get() )
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// the attempt to load the lib, or to create the factory, failed
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// -> fall back to a dummy factory
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s_pFactory = new AccessibleDummyFactory;
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#ifdef UNLOAD_ON_LAST_CLIENT_DYING
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}
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#endif
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m_bInitialized = true;
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}
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//--------------------------------------------------------------------
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AccessibilityClient::~AccessibilityClient()
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{
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if ( m_bInitialized )
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{
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::osl::MutexGuard aGuard( ::osl::Mutex::getGlobalMutex() );
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#ifdef UNLOAD_ON_LAST_CLIENT_DYING
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if( 0 == osl_decrementInterlockedCount( &s_nAccessibilityClients ) )
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{
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s_pFactory = NULL;
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s_pAccessibleFactoryFunc = NULL;
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if ( s_hAccessibleImplementationModule )
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{
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osl_unloadModule( s_hAccessibleImplementationModule );
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s_hAccessibleImplementationModule = NULL;
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}
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}
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#endif // UNLOAD_ON_LAST_CLIENT_DYING
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}
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}
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//--------------------------------------------------------------------
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IAccessibleFactory& AccessibilityClient::getFactory()
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{
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ensureInitialized();
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OSL_ENSURE( s_pFactory.is(), "AccessibilityClient::getFactory: at least a dummy factory should have been created!" );
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return *s_pFactory;
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}
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//........................................................................
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} // namespace toolkit
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//........................................................................
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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