| /************************************************************** |
| * |
| * 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 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| |
| |
| // MARKER(update_precomp.py): autogen include statement, do not remove |
| #include "precompiled_toolkit.hxx" |
| #include <toolkit/helper/accessibilityclient.hxx> |
| #include <toolkit/helper/accessiblefactory.hxx> |
| #include <osl/module.h> |
| #include <osl/diagnose.h> |
| #include <tools/solar.h> |
| |
| // #define UNLOAD_ON_LAST_CLIENT_DYING |
| // this is not recommended currently. If enabled, the implementation will log |
| // the number of active clients, and unload the acc library when the last client |
| // goes away. |
| // Sounds like a good idea, unfortunately, there's no guarantee that all objects |
| // implemented in this library are already dead. |
| // Iow, just because an object implementing an XAccessible (implemented in this lib |
| // here) died, it's not said that everybody released all references to the |
| // XAccessibleContext used by this component, and implemented in the acc lib. |
| // So we cannot really unload the lib. |
| // |
| // Alternatively, if the lib would us own "usage counting", i.e. every component |
| // implemented therein would affect a static ref count, the acc lib could care |
| // for unloading itself. |
| |
| //........................................................................ |
| namespace toolkit |
| { |
| //........................................................................ |
| |
| using namespace ::com::sun::star::uno; |
| using namespace ::com::sun::star::accessibility; |
| |
| namespace |
| { |
| #ifdef UNLOAD_ON_LAST_CLIENT_DYING |
| static oslInterlockedCount s_nAccessibilityClients = 0; |
| #endif // UNLOAD_ON_LAST_CLIENT_DYING |
| static oslModule s_hAccessibleImplementationModule = NULL; |
| static GetStandardAccComponentFactory s_pAccessibleFactoryFunc = NULL; |
| static ::rtl::Reference< IAccessibleFactory > s_pFactory; |
| } |
| |
| //==================================================================== |
| //= AccessibleDummyFactory |
| //==================================================================== |
| class AccessibleDummyFactory : public IAccessibleFactory |
| { |
| public: |
| AccessibleDummyFactory(); |
| |
| protected: |
| virtual ~AccessibleDummyFactory(); |
| |
| private: |
| AccessibleDummyFactory( const AccessibleDummyFactory& ); // never implemented |
| AccessibleDummyFactory& operator=( const AccessibleDummyFactory& ); // never implemented |
| |
| oslInterlockedCount m_refCount; |
| |
| public: |
| // IReference |
| virtual oslInterlockedCount SAL_CALL acquire(); |
| virtual oslInterlockedCount SAL_CALL release(); |
| |
| // IAccessibleFactory |
| ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext > |
| createAccessibleContext( VCLXButton* /*_pXWindow*/ ) |
| { |
| return NULL; |
| } |
| ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext > |
| createAccessibleContext( VCLXCheckBox* /*_pXWindow*/ ) |
| { |
| return NULL; |
| } |
| ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext > |
| createAccessibleContext( VCLXRadioButton* /*_pXWindow*/ ) |
| { |
| return NULL; |
| } |
| ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext > |
| createAccessibleContext( VCLXListBox* /*_pXWindow*/ ) |
| { |
| return NULL; |
| } |
| ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext > |
| createAccessibleContext( VCLXFixedHyperlink* /*_pXWindow*/ ) |
| { |
| return NULL; |
| } |
| ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext > |
| createAccessibleContext( VCLXFixedText* /*_pXWindow*/ ) |
| { |
| return NULL; |
| } |
| ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext > |
| createAccessibleContext( VCLXScrollBar* /*_pXWindow*/ ) |
| { |
| return NULL; |
| } |
| ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext > |
| createAccessibleContext( VCLXEdit* /*_pXWindow*/ ) |
| { |
| return NULL; |
| } |
| ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext > |
| createAccessibleContext( VCLXComboBox* /*_pXWindow*/ ) |
| { |
| return NULL; |
| } |
| ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext > |
| createAccessibleContext( VCLXToolBox* /*_pXWindow*/ ) |
| { |
| return NULL; |
| } |
| ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext > |
| createAccessibleContext( VCLXWindow* /*_pXWindow*/ ) |
| { |
| return NULL; |
| } |
| ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessible > |
| createAccessible( Menu* /*_pMenu*/, sal_Bool /*_bIsMenuBar*/ ) |
| { |
| return NULL; |
| } |
| }; |
| |
| //-------------------------------------------------------------------- |
| AccessibleDummyFactory::AccessibleDummyFactory() |
| { |
| } |
| |
| //-------------------------------------------------------------------- |
| AccessibleDummyFactory::~AccessibleDummyFactory() |
| { |
| } |
| |
| //-------------------------------------------------------------------- |
| oslInterlockedCount SAL_CALL AccessibleDummyFactory::acquire() |
| { |
| return osl_incrementInterlockedCount( &m_refCount ); |
| } |
| |
| //-------------------------------------------------------------------- |
| oslInterlockedCount SAL_CALL AccessibleDummyFactory::release() |
| { |
| if ( 0 == osl_decrementInterlockedCount( &m_refCount ) ) |
| { |
| delete this; |
| return 0; |
| } |
| return m_refCount; |
| } |
| |
| //==================================================================== |
| //= AccessibilityClient |
| //==================================================================== |
| //-------------------------------------------------------------------- |
| AccessibilityClient::AccessibilityClient() |
| :m_bInitialized( false ) |
| { |
| } |
| |
| //-------------------------------------------------------------------- |
| extern "C" { static void SAL_CALL thisModule() {} } |
| |
| void AccessibilityClient::ensureInitialized() |
| { |
| if ( m_bInitialized ) |
| return; |
| |
| ::osl::MutexGuard aGuard( ::osl::Mutex::getGlobalMutex() ); |
| |
| #ifdef UNLOAD_ON_LAST_CLIENT_DYING |
| if ( 1 == osl_incrementInterlockedCount( &s_nAccessibilityClients ) ) |
| { // the first client |
| #endif // UNLOAD_ON_LAST_CLIENT_DYING |
| // load the library implementing the factory |
| if ( !s_pFactory.get() ) |
| { |
| const ::rtl::OUString sModuleName = ::rtl::OUString::createFromAscii( |
| SVLIBRARY( "acc" ) |
| ); |
| s_hAccessibleImplementationModule = osl_loadModuleRelative( &thisModule, sModuleName.pData, 0 ); |
| if ( s_hAccessibleImplementationModule != NULL ) |
| { |
| const ::rtl::OUString sFactoryCreationFunc = |
| ::rtl::OUString::createFromAscii( "getStandardAccessibleFactory" ); |
| s_pAccessibleFactoryFunc = (GetStandardAccComponentFactory) |
| osl_getFunctionSymbol( s_hAccessibleImplementationModule, sFactoryCreationFunc.pData ); |
| |
| } |
| OSL_ENSURE( s_pAccessibleFactoryFunc, "AccessibilityClient::ensureInitialized: could not load the library, or not retrieve the needed symbol!" ); |
| |
| // get a factory instance |
| if ( s_pAccessibleFactoryFunc ) |
| { |
| IAccessibleFactory* pFactory = static_cast< IAccessibleFactory* >( (*s_pAccessibleFactoryFunc)() ); |
| OSL_ENSURE( pFactory, "AccessibilityClient::ensureInitialized: no factory provided by the A11Y lib!" ); |
| if ( pFactory ) |
| { |
| s_pFactory = pFactory; |
| pFactory->release(); |
| } |
| } |
| } |
| |
| if ( !s_pFactory.get() ) |
| // the attempt to load the lib, or to create the factory, failed |
| // -> fall back to a dummy factory |
| s_pFactory = new AccessibleDummyFactory; |
| #ifdef UNLOAD_ON_LAST_CLIENT_DYING |
| } |
| #endif |
| |
| m_bInitialized = true; |
| } |
| |
| //-------------------------------------------------------------------- |
| AccessibilityClient::~AccessibilityClient() |
| { |
| if ( m_bInitialized ) |
| { |
| ::osl::MutexGuard aGuard( ::osl::Mutex::getGlobalMutex() ); |
| |
| #ifdef UNLOAD_ON_LAST_CLIENT_DYING |
| if( 0 == osl_decrementInterlockedCount( &s_nAccessibilityClients ) ) |
| { |
| s_pFactory = NULL; |
| s_pAccessibleFactoryFunc = NULL; |
| if ( s_hAccessibleImplementationModule ) |
| { |
| osl_unloadModule( s_hAccessibleImplementationModule ); |
| s_hAccessibleImplementationModule = NULL; |
| } |
| } |
| #endif // UNLOAD_ON_LAST_CLIENT_DYING |
| } |
| } |
| |
| //-------------------------------------------------------------------- |
| IAccessibleFactory& AccessibilityClient::getFactory() |
| { |
| ensureInitialized(); |
| OSL_ENSURE( s_pFactory.is(), "AccessibilityClient::getFactory: at least a dummy factory should have been created!" ); |
| return *s_pFactory; |
| } |
| |
| //........................................................................ |
| } // namespace toolkit |
| //........................................................................ |
