/************************************************************************* * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * Copyright 2008 by Sun Microsystems, Inc. * * OpenOffice.org - a multi-platform office productivity suite * * $RCSfile: AccessibleParaManager.hxx,v $ * $Revision: 1.12 $ * * This file is part of OpenOffice.org. * * OpenOffice.org is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License version 3 * only, as published by the Free Software Foundation. * * OpenOffice.org is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License version 3 for more details * (a copy is included in the LICENSE file that accompanied this code). * * You should have received a copy of the GNU Lesser General Public License * version 3 along with OpenOffice.org. If not, see * * for a copy of the LGPLv3 License. * ************************************************************************/ #ifndef _SVX_ACCESSIBLE_PARA_MANAGER_HXX #define _SVX_ACCESSIBLE_PARA_MANAGER_HXX #include #include #include #include #include #include #include #include #include class SvxEditSourceAdapter; namespace accessibility { class AccessibleEditableTextPara; /** Helper class for WeakCppRef This class is returned by WeakChild::get() and contains a hard reference and a reference to the c++ object. This combination prevents the c++ object from destruction during usage. Hold this object only as long as absolutely necessary, prevents referenced object from vanishing otherwise */ template < class UnoType, class CppType > class HardCppRef { public: typedef UnoType UnoInterfaceType; typedef CppType InterfaceType; HardCppRef( const ::com::sun::star::uno::WeakReference< UnoInterfaceType >& xRef, InterfaceType* rImpl ) : mxRef( xRef ), mpImpl( rImpl ) { } /** Query whether the reference is still valid. Hands off also from the implementation pointer if this returns sal_False! */ sal_Bool is() const { return mxRef.is(); } InterfaceType* operator->() const { return mpImpl; } InterfaceType& operator*() const { return *mpImpl; } ::com::sun::star::uno::Reference< UnoInterfaceType >& getRef() { return mxRef; } const ::com::sun::star::uno::Reference< UnoInterfaceType >& getRef() const { return mxRef; } // default copy constructor and assignment will do // HardCppRef( const HardCppRef& ); // HardCppRef& operator= ( const HardCppRef& ); private: // the interface, hard reference to prevent object from vanishing ::com::sun::star::uno::Reference< UnoInterfaceType > mxRef; // the c++ object, for our internal stuff InterfaceType* mpImpl; }; /** Helper class for weak object references plus implementation This class combines a weak reference (to facilitate automatic object disposal if user drops last reference) and hard reference to the c++ class (for fast access and bypassing of the UNO interface) */ template < class UnoType, class CppType > class WeakCppRef { public: typedef UnoType UnoInterfaceType; typedef CppType InterfaceType; typedef HardCppRef< UnoInterfaceType, InterfaceType > HardRefType; WeakCppRef() : maWeakRef(), maUnsafeRef( NULL ) {} WeakCppRef( InterfaceType& rImpl ) : maWeakRef( ::com::sun::star::uno::Reference< UnoInterfaceType >( rImpl, ::com::sun::star::uno::UNO_QUERY ) ), maUnsafeRef( &rImpl ) { } WeakCppRef( HardRefType& rImpl ) : maWeakRef( rImpl.getRef() ), maUnsafeRef( rImpl.operator->() ) { } // get object with c++ object and hard reference (which // prevents the c++ object from destruction during use) HardRefType get() const { return HardRefType( maWeakRef, maUnsafeRef ); } // default copy constructor and assignment will do // WeakCppRef( const WeakCppRef& ); // WeakCppRef& operator= ( const WeakCppRef& ); private: // the interface, hold weakly ::com::sun::star::uno::WeakReference< UnoInterfaceType > maWeakRef; // hard ref to c++ class, _only_ valid if maWeakRef.is() is true InterfaceType* maUnsafeRef; }; /** This class manages the paragraphs of an AccessibleTextHelper To facilitate automatic deletion of paragraphs no longer used, this class uses the WeakCppRef helper to hold the objects weakly. */ class AccessibleParaManager { public: typedef WeakCppRef < ::com::sun::star::accessibility::XAccessible, AccessibleEditableTextPara > WeakPara; typedef ::std::pair< WeakPara, ::com::sun::star::awt::Rectangle > WeakChild; typedef ::std::pair< ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessible > , ::com::sun::star::awt::Rectangle > Child; typedef ::std::vector< WeakChild > VectorOfChildren; typedef ::std::vector< sal_Int16 > VectorOfStates; AccessibleParaManager(); ~AccessibleParaManager(); /** Sets a vector of additional accessible states. The states are passed to every created child object (text paragraph). The state values are defined in com::sun::star::accessibility::AccessibleStateType. */ void SetAdditionalChildStates( const VectorOfStates& rChildStates ); /** Returns the additional accessible states for children. */ const VectorOfStates& GetAdditionalChildStates() const; /** Set the number of paragraphs @param nNumPara The total number of paragraphs the EditEngine currently has (_not_ the number of currently visible children) */ void SetNum( sal_Int32 nNumParas ); /** Get the number of paragraphs currently possible */ sal_uInt32 GetNum() const; // iterators VectorOfChildren::iterator begin(); VectorOfChildren::iterator end(); VectorOfChildren::const_iterator begin() const; VectorOfChildren::const_iterator end() const; // dealing with single paragraphs (release reference, return reference etc) void Release( sal_uInt32 nPara ); /// Set focus to given child void SetFocus( sal_Int32 nChild ); void FireEvent( sal_uInt32 nPara, const sal_Int16 nEventId, const ::com::sun::star::uno::Any& rNewValue = ::com::sun::star::uno::Any(), const ::com::sun::star::uno::Any& rOldValue = ::com::sun::star::uno::Any() ) const; static sal_Bool IsReferencable( WeakPara::HardRefType aChild ); sal_Bool IsReferencable( sal_uInt32 nChild ) const; static void ShutdownPara( const WeakChild& rChild ); Child CreateChild( sal_Int32 nChild, const ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessible >& xFrontEnd, SvxEditSourceAdapter& rEditSource, sal_uInt32 nParagraphIndex ); WeakChild GetChild( sal_uInt32 nParagraphIndex ) const; // forwarder to all paragraphs /// Make all children active and editable (or off) void SetActive( sal_Bool bActive = sal_True ); /// Set state of all children void SetState( const sal_Int16 nStateId ); /// Unset state of all children void UnSetState( const sal_Int16 nStateId ); /// Set offset to edit engine for all children void SetEEOffset ( const Point& rOffset ); /// Change edit source on all living children void SetEditSource ( SvxEditSourceAdapter* pEditSource ); /// Dispose all living children void Dispose (); // forwarder to given paragraphs //------------------------------------------------------------------------ /** Release the given range of paragraphs All ranges have the meaning [start,end), similar to STL @param nStartPara Index of paragraph to start with releasing @param nEndPara Index of first paragraph to stop with releasing */ void Release( sal_uInt32 nStartPara, sal_uInt32 nEndPara ); /** Fire event for the given range of paragraphs All ranges have the meaning [start,end), similar to STL @param nStartPara Index of paragraph to start with event firing @param nEndPara Index of first paragraph to stop with event firing */ void FireEvent( sal_uInt32 nStartPara, sal_uInt32 nEndPara, const sal_Int16 nEventId, const ::com::sun::star::uno::Any& rNewValue = ::com::sun::star::uno::Any(), const ::com::sun::star::uno::Any& rOldValue = ::com::sun::star::uno::Any() ) const; /** Functor adapter for ForEach template Adapts giving functor such that only the paragraph objects are accessed and the fact that our children are held weakly is hidden The functor must provide the following method: void operator() ( AccessibleEditablePara& ) */ template < typename Functor > class WeakChildAdapter : public ::std::unary_function< const WeakChild&, void > { public: WeakChildAdapter( Functor& rFunctor ) : mrFunctor(rFunctor) {} void operator()( const WeakChild& rPara ) { // retrieve hard reference from weak one WeakPara::HardRefType aHardRef( rPara.first.get() ); if( aHardRef.is() ) mrFunctor( *aHardRef ); } private: Functor& mrFunctor; }; /** Adapter for unary member functions Since STL's binder don't work with const& arguments (and BOOST's neither, at least on MSVC), have to provide our own adapter for unary member functions. Create with pointer to member function of AccessibleEditableTextPara and the corresponding argument. */ template < typename Argument > class MemFunAdapter : public ::std::unary_function< const WeakChild&, void > { public: typedef void (::accessibility::AccessibleEditableTextPara::*FunctionPointer)( Argument ); MemFunAdapter( FunctionPointer aFunPtr, Argument aArg ) : maFunPtr(aFunPtr), maArg(aArg) {} void operator()( const WeakChild& rPara ) { // retrieve hard reference from weak one WeakPara::HardRefType aHardRef( rPara.first.get() ); if( aHardRef.is() ) (*aHardRef.*maFunPtr)( maArg ); } private: FunctionPointer maFunPtr; Argument maArg; }; /** Generic algorithm on given paragraphs Convenience method, that already adapts the given functor with WeakChildAdapter */ template < typename Functor > void ForEach( Functor& rFunctor ) { ::std::for_each( begin(), end(), WeakChildAdapter< Functor >(rFunctor) ); } private: /// Set state on given child void SetState( sal_Int32 nChild, const sal_Int16 nStateId ); /// Unset state on given child void UnSetState( sal_Int32 nChild, const sal_Int16 nStateId ); /// Init child with default state (as stored in previous SetFocus and SetActive calls) void InitChild( AccessibleEditableTextPara& rChild, SvxEditSourceAdapter& rEditSource, sal_Int32 nChild, sal_uInt32 nParagraphIndex ) const; // vector the size of the paragraph number of the underlying EditEngine VectorOfChildren maChildren; /// Additional states that will be set at every created child object. VectorOfStates maChildStates; // cache EE offset for child creation Point maEEOffset; // which child currently has the focus (-1 for none) sal_Int32 mnFocusedChild; // whether children are active and editable sal_Bool mbActive; }; } // end of namespace accessibility #endif