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diff --git a/include/comphelper/accessiblewrapper.hxx b/include/comphelper/accessiblewrapper.hxx new file mode 100644 index 0000000000..089c143b97 --- /dev/null +++ b/include/comphelper/accessiblewrapper.hxx @@ -0,0 +1,404 @@ +/* -*- 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 . + */ + +#ifndef INCLUDED_COMPHELPER_ACCESSIBLEWRAPPER_HXX +#define INCLUDED_COMPHELPER_ACCESSIBLEWRAPPER_HXX + +#include <config_options.h> +#include <sal/config.h> + +#include <map> + +#include <comphelper/proxyaggregation.hxx> +#include <com/sun/star/accessibility/XAccessible.hpp> +#include <com/sun/star/accessibility/XAccessibleContext.hpp> +#include <com/sun/star/accessibility/XAccessibleEventBroadcaster.hpp> +#include <com/sun/star/accessibility/XAccessibleEventListener.hpp> +#include <cppuhelper/compbase.hxx> +#include <cppuhelper/implbase.hxx> +#include <cppuhelper/implbase1.hxx> +#include <cppuhelper/basemutex.hxx> +#include <comphelper/uno3.hxx> +#include <cppuhelper/interfacecontainer.h> +#include <comphelper/accessibleeventnotifier.hxx> +#include <comphelper/comphelperdllapi.h> +#include <rtl/ref.hxx> + +namespace com::sun::star::uno { class XComponentContext; } + +namespace comphelper +{ + + + //= OAccessibleWrapper + + + class OAccessibleContextWrapper; + class OWrappedAccessibleChildrenManager; + + struct OAccessibleWrapper_Base : + public ::cppu::ImplHelper1 < css::accessibility::XAccessible > + { + protected: + ~OAccessibleWrapper_Base() {} + }; + + /** a class which aggregates a proxy for an XAccessible, and wrapping the context returned by this + XAccessible. + */ + class COMPHELPER_DLLPUBLIC OAccessibleWrapper:public OAccessibleWrapper_Base + ,public OComponentProxyAggregation + + { + private: + css::uno::Reference< css::accessibility::XAccessible > + m_xParentAccessible; + css::uno::WeakReference< css::accessibility::XAccessibleContext > + m_aContext; + css::uno::Reference< css::accessibility::XAccessible > + m_xInnerAccessible; + + public: + /** ctor + @param _rxContext + a service factory + + @param _rxInnerAccessible + the object to wrap + + @param _rxParentAccessible + The XAccessible which is our parent + */ + OAccessibleWrapper( + const css::uno::Reference< css::uno::XComponentContext >& _rxContext, + const css::uno::Reference< css::accessibility::XAccessible >& _rxInnerAccessible, + const css::uno::Reference< css::accessibility::XAccessible >& _rxParentAccessible + ); + DECLARE_XINTERFACE() + DECLARE_XTYPEPROVIDER() + + // returns the context without creating it + css::uno::Reference< css::accessibility::XAccessibleContext > + getContextNoCreate( ) const; + + protected: + virtual css::uno::Reference< css::accessibility::XAccessibleContext > SAL_CALL + getAccessibleContext( ) override; + + const css::uno::Reference< css::accessibility::XAccessible >& + getParent() const { return m_xParentAccessible; } + + // own overridables + virtual rtl::Reference<OAccessibleContextWrapper> createAccessibleContext( + const css::uno::Reference< css::accessibility::XAccessibleContext >& _rxInnerContext + ); + + protected: + virtual ~OAccessibleWrapper( ) override; + + private: + OAccessibleWrapper( const OAccessibleWrapper& ) = delete; + OAccessibleWrapper& operator=( const OAccessibleWrapper& ) = delete; + }; + + + //= OAccessibleContextWrapperHelper + + + typedef ::cppu::ImplHelper1 < css::accessibility::XAccessibleEventListener + > OAccessibleContextWrapperHelper_Base; + + /** Helper for wrapping an XAccessibleContext by aggregating a proxy for it. + + <p>This class does not have own ref counting. In addition, it does not implement + the XAccessibleContext interface, but provides all the methods from this interface + which must be implemented using the inner context (such as getAccessibleChild*).</p> + + <p>Children of the aggregated XAccessibleContext are wrapped, too.</p> + + <p>AccessibleEvents fired by the inner context are multiplexed, especially, any references to + children in such events are translated. This means that even in such events, no un-wrapped object + will ever leave this class - if the aggregated context notifies a child event, the child passed + to the event is wrapped</p> + + @seealso OAccessibleContextWrapper + */ + class COMPHELPER_DLLPUBLIC OAccessibleContextWrapperHelper + :private OComponentProxyAggregationHelper + ,public OAccessibleContextWrapperHelper_Base + { + protected: + /// the context we're wrapping (properly typed, in opposite to OComponentProxyAggregationHelper::m_xInner) + css::uno::Reference< css::accessibility::XAccessibleContext > + m_xInnerContext; + /// the XAccessible which created this context + css::uno::Reference< css::accessibility::XAccessible > + m_xOwningAccessible; + /// the XAccessible which is to be returned in getAccessibleParent + css::uno::Reference< css::accessibility::XAccessible > + m_xParentAccessible; + + rtl::Reference<OWrappedAccessibleChildrenManager> m_xChildMapper; // for mapping children from our inner context to our callers + + protected: + /** ctor + + @param _rxContext + a service factory + + @param _rxInnerAccessibleContext + the object to wrap + + @param _rxOwningAccessible + The XAccessible which created this object. This is necessary because children + of our wrapped context need to be wrapped, too, and if they're asked for a parent, + they of course should return the proper parent<br/> + The object will be held with a hard reference + + @param _rxParentAccessible + The XAccessible to return in the getAccessibleParent call + */ + OAccessibleContextWrapperHelper( + const css::uno::Reference< css::uno::XComponentContext >& _rxContext, + ::cppu::OBroadcastHelper& _rBHelper, + const css::uno::Reference< css::accessibility::XAccessibleContext >& _rxInnerAccessibleContext, + const css::uno::Reference< css::accessibility::XAccessible >& _rxOwningAccessible, + const css::uno::Reference< css::accessibility::XAccessible >& _rxParentAccessible + ); + + /// to be called from within your ctor - does the aggregation of a proxy for m_xInnerContext + void aggregateProxy( + oslInterlockedCount& _rRefCount, + ::cppu::OWeakObject& _rDelegator + ); + + protected: + // XInterface + css::uno::Any SAL_CALL queryInterface( const css::uno::Type& _rType ) override; + + // XTypeProvider + DECLARE_XTYPEPROVIDER( ) + + // XAccessibleContext + /// @throws css::uno::RuntimeException + sal_Int64 baseGetAccessibleChildCount( ); + /// @throws css::lang::IndexOutOfBoundsException + /// @throws css::uno::RuntimeException + css::uno::Reference< css::accessibility::XAccessible > baseGetAccessibleChild( sal_Int64 i ); + /// @throws css::uno::RuntimeException + css::uno::Reference< css::accessibility::XAccessibleRelationSet > baseGetAccessibleRelationSet( ); + + // XAccessibleEventListener + virtual void SAL_CALL notifyEvent( const css::accessibility::AccessibleEventObject& aEvent ) override; + + // XEventListener + virtual void SAL_CALL disposing( const css::lang::EventObject& Source ) override; + + // XComponent/OComponentProxyAggregationHelper + virtual void SAL_CALL dispose() override; + + // own overridables + /** notify an accessible event which has been translated (if necessary) + + <p>Usually, you derive your class from both OAccessibleContextWrapperHelper and XAccessibleEventBroadcaster, + and simply call all your XAccessibleEventListener with the given event.</p> + + <p>The mutex of the BroadcastHelper passed to the instance's ctor is <em>not</em> locked when calling + into this method</p> + + @throws css::uno::RuntimeException + */ + virtual void notifyTranslatedEvent( const css::accessibility::AccessibleEventObject& _rEvent ) = 0; + + protected: + virtual ~OAccessibleContextWrapperHelper( ) override; + + OAccessibleContextWrapperHelper(const OAccessibleContextWrapperHelper&) = delete; + OAccessibleContextWrapperHelper& operator=(const OAccessibleContextWrapperHelper&) = delete; + }; + + + //= OAccessibleContextWrapper + + typedef ::cppu::WeakComponentImplHelper< css::accessibility::XAccessibleEventBroadcaster + , css::accessibility::XAccessibleContext + > OAccessibleContextWrapper_CBase; + + class COMPHELPER_DLLPUBLIC OAccessibleContextWrapper + :public cppu::BaseMutex + ,public OAccessibleContextWrapper_CBase + ,public OAccessibleContextWrapperHelper + { + private: + ::comphelper::AccessibleEventNotifier::TClientId m_nNotifierClient; // for notifying AccessibleEvents + + public: + /** ctor + + @param _rxContext + a service factory + + @param _rxInnerAccessibleContext + the object to wrap + + @param _rxOwningAccessible + The XAccessible which created this object. This is necessary because children + of our wrapped context need to be wrapped, too, and if they're asked for a parent, + they of course should return the proper parent<br/> + The object will be held with a hard reference + + @param _rxParentAccessible + The XAccessible to return in the getAccessibleParent call + */ + OAccessibleContextWrapper( + const css::uno::Reference< css::uno::XComponentContext >& _rxContext, + const css::uno::Reference< css::accessibility::XAccessibleContext >& _rxInnerAccessibleContext, + const css::uno::Reference< css::accessibility::XAccessible >& _rxOwningAccessible, + const css::uno::Reference< css::accessibility::XAccessible >& _rxParentAccessible + ); + + // XInterface + DECLARE_XINTERFACE( ) + // XTypeProvider + DECLARE_XTYPEPROVIDER( ) + + // XAccessibleContext + virtual sal_Int64 SAL_CALL getAccessibleChildCount( ) override; + virtual css::uno::Reference< css::accessibility::XAccessible > SAL_CALL getAccessibleChild( sal_Int64 i ) override; + virtual css::uno::Reference< css::accessibility::XAccessible > SAL_CALL getAccessibleParent( ) override; + virtual sal_Int64 SAL_CALL getAccessibleIndexInParent( ) override; + virtual sal_Int16 SAL_CALL getAccessibleRole( ) override; + virtual OUString SAL_CALL getAccessibleDescription( ) override; + virtual OUString SAL_CALL getAccessibleName( ) override; + virtual css::uno::Reference< css::accessibility::XAccessibleRelationSet > SAL_CALL getAccessibleRelationSet( ) override; + virtual sal_Int64 SAL_CALL getAccessibleStateSet( ) override; + virtual css::lang::Locale SAL_CALL getLocale( ) override; + + // XAccessibleEventBroadcaster + virtual void SAL_CALL addAccessibleEventListener( const css::uno::Reference< css::accessibility::XAccessibleEventListener >& xListener ) override; + virtual void SAL_CALL removeAccessibleEventListener( const css::uno::Reference< css::accessibility::XAccessibleEventListener >& xListener ) override; + + // OAccessibleContextWrapper + virtual void notifyTranslatedEvent( const css::accessibility::AccessibleEventObject& _rEvent ) override; + + // helper method for both 'disposing' methods + void implDisposing(const css::lang::EventObject* pEvent); + + // OComponentHelper + void SAL_CALL disposing() override; + + // XAccessibleEventListener + virtual void SAL_CALL disposing(const css::lang::EventObject& rEvent) override; + + protected: + virtual ~OAccessibleContextWrapper() override; + + private: + OAccessibleContextWrapper( const OAccessibleContextWrapper& ) = delete; + OAccessibleContextWrapper& operator=( const OAccessibleContextWrapper& ) = delete; + }; + + + //= OWrappedAccessibleChildrenManager + + + typedef ::std::map < css::uno::Reference< css::accessibility::XAccessible > + , rtl::Reference< comphelper::OAccessibleWrapper > + > AccessibleMap; + // TODO: think about if we should hold these objects weak + + typedef ::cppu::WeakImplHelper< css::lang::XEventListener + > OWrappedAccessibleChildrenManager_Base; + /** manages wrapping XAccessible's to XAccessible's + */ + class UNLESS_MERGELIBS(COMPHELPER_DLLPUBLIC) OWrappedAccessibleChildrenManager final : public OWrappedAccessibleChildrenManager_Base + { + css::uno::Reference< css::uno::XComponentContext > + m_xContext; + css::uno::WeakReference< css::accessibility::XAccessible > + m_aOwningAccessible; // the XAccessible which belongs to the XAccessibleContext which we work for + AccessibleMap m_aChildrenMap; // for caching children + bool m_bTransientChildren; // are we prohibited to cache our children? + + public: + /// ctor + OWrappedAccessibleChildrenManager( + const css::uno::Reference< css::uno::XComponentContext >& _rxContext + ); + + /** specifies if the children are to be considered transient (i.e.: not cached) + <p>to be called only once per lifetime</p> + */ + void setTransientChildren( bool _bSet ); + + /** sets the XAccessible which belongs to the XAccessibleContext which we work for + <p>to be called only once per lifetime</p> + */ + void setOwningAccessible( const css::uno::Reference< css::accessibility::XAccessible >& _rxAcc ); + + /// retrieves a wrapper for the given accessible + css::uno::Reference< css::accessibility::XAccessible > + getAccessibleWrapperFor( + const css::uno::Reference< css::accessibility::XAccessible >& _rxKey + ); + + /// erases the given key from the map (if it is present there) + void removeFromCache( const css::uno::Reference< css::accessibility::XAccessible >& _rxKey ); + + /// invalidates (i.e. empties) the map + void invalidateAll( ); + + /** disposes (i.e. clears) the manager + + <p>Note that the XAccessibleContext's of the mapped XAccessible objects are disposed, too.</p> + */ + void dispose(); + + /** handles a notification as got from the parent of the children we're managing + <p>This applies only to the notifications which have a direct impact on our map.</p> + */ + void handleChildNotification( const css::accessibility::AccessibleEventObject& _rEvent ); + + /** translates events as got from the parent of the children we're managing + <p>This applies only to the notifications which deal with child objects which we manage.</p> + */ + void translateAccessibleEvent( + const css::accessibility::AccessibleEventObject& _rEvent, + css::accessibility::AccessibleEventObject& _rTranslatedEvent + ); + + private: + // XEventListener + virtual void SAL_CALL disposing( const css::lang::EventObject& Source ) override; + + void implTranslateChildEventValue( const css::uno::Any& _rInValue, css::uno::Any& _rOutValue ); + + virtual ~OWrappedAccessibleChildrenManager( ) override; + + OWrappedAccessibleChildrenManager( const OWrappedAccessibleChildrenManager& ) = delete; + OWrappedAccessibleChildrenManager& operator=( const OWrappedAccessibleChildrenManager& ) = delete; + }; + + +} // namespace accessibility + + +#endif // INCLUDED_COMPHELPER_ACCESSIBLEWRAPPER_HXX + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |