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Diffstat (limited to 'include/editeng/AccessibleParaManager.hxx')
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1 files changed, 271 insertions, 0 deletions
diff --git a/include/editeng/AccessibleParaManager.hxx b/include/editeng/AccessibleParaManager.hxx new file mode 100644 index 0000000000..51ae37ed31 --- /dev/null +++ b/include/editeng/AccessibleParaManager.hxx @@ -0,0 +1,271 @@ +/* -*- 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_EDITENG_ACCESSIBLEPARAMANAGER_HXX +#define INCLUDED_EDITENG_ACCESSIBLEPARAMANAGER_HXX + +#include <config_options.h> +#include <vector> +#include <utility> +#include <tools/gen.hxx> +#include <com/sun/star/awt/Rectangle.hpp> +#include <com/sun/star/uno/Reference.hxx> +#include <cppuhelper/weakref.hxx> +#include <rtl/ref.hxx> +#include <editeng/editengdllapi.h> + +namespace com::sun::star::accessibility { class XAccessible; } + +class SvxEditSourceAdapter; + +namespace accessibility +{ + class AccessibleEditableTextPara; + + /** 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; + + WeakCppRef() : maWeakRef(), maUnsafeRef( nullptr ) {} + + WeakCppRef(rtl::Reference<InterfaceType> const & rImpl): + maWeakRef(rImpl.get()), + maUnsafeRef(rImpl.get()) + { + } + + // get object with c++ object and hard reference (which + // prevents the c++ object from destruction during use) + rtl::Reference<InterfaceType> get() const { + css::uno::Reference<UnoInterfaceType> ref(maWeakRef); + return ref.is() ? maUnsafeRef : rtl::Reference<InterfaceType>(); + } + + // default copy constructor and assignment will do + // WeakCppRef( const WeakCppRef& ); + // WeakCppRef& operator= ( const WeakCppRef& ); + + private: + + // the interface, hold weakly + css::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 UNLESS_MERGELIBS(EDITENG_DLLPUBLIC) AccessibleParaManager + { + public: + typedef WeakCppRef < css::accessibility::XAccessible, AccessibleEditableTextPara > WeakPara; + typedef ::std::pair< WeakPara, css::awt::Rectangle > WeakChild; + typedef ::std::pair< css::uno::Reference< + css::accessibility::XAccessible > , css::awt::Rectangle > Child; + typedef ::std::vector< WeakChild > VectorOfChildren; + + AccessibleParaManager(); + ~AccessibleParaManager(); + + /** Sets a bitset of additional accessible states. + + The states are passed to every created child object + (text paragraph). The state values are defined in + css::accessibility::AccessibleStateType. + */ + void SetAdditionalChildStates( sal_Int64 nChildStates ); + + /** 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_Int32 GetNum() const; + + // iterators + VectorOfChildren::iterator begin(); + VectorOfChildren::iterator end(); + + /// Set focus to given child + void SetFocus( sal_Int32 nChild ); + + void FireEvent( sal_Int32 nPara, + const sal_Int16 nEventId ) const; + + static bool IsReferencable(rtl::Reference<AccessibleEditableTextPara> const & aChild); + bool IsReferencable( sal_Int32 nChild ) const; + static void ShutdownPara( const WeakChild& rChild ); + + Child CreateChild( sal_Int32 nChild, + const css::uno::Reference< css::accessibility::XAccessible >& xFrontEnd, + SvxEditSourceAdapter& rEditSource, + sal_Int32 nParagraphIndex ); + + WeakChild GetChild( sal_Int32 nParagraphIndex ) const; + bool HasCreatedChild( sal_Int32 nParagraphIndex ) const; + + // forwarder to all paragraphs + /// Make all children active and editable (or off) + void SetActive( bool bActive = true ); + /// Set state of all children + void SetState( const sal_Int64 nStateId ); + /// Unset state of all children + void UnSetState( const sal_Int64 nStateId ); + /// Set offset to edit engine for all children + void SetEEOffset ( const Point& rOffset ); + /// 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_Int32 nStartPara, sal_Int32 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_Int32 nStartPara, + sal_Int32 nEndPara, + const sal_Int16 nEventId, + const css::uno::Any& rNewValue = css::uno::Any(), + const css::uno::Any& rOldValue = css::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: + WeakChildAdapter( Functor& rFunctor ) : mrFunctor(rFunctor) {} + void operator()( const WeakChild& rPara ) + { + // retrieve hard reference from weak one + auto 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: + 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 + auto aHardRef( rPara.first.get() ); + + if( aHardRef.is() ) + (*aHardRef.*maFunPtr)( maArg ); + } + + private: + FunctionPointer maFunPtr; + Argument maArg; + }; + + private: + /// Set state on given child + void SetState( sal_Int32 nChild, const sal_Int64 nStateId ); + /// Unset state on given child + void UnSetState( sal_Int32 nChild, const sal_Int64 nStateId ); + /// Init child with default state (as stored in previous SetFocus and SetActive calls) + void InitChild( AccessibleEditableTextPara& rChild, + SvxEditSourceAdapter& rEditSource, + sal_Int32 nChild, + sal_Int32 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. + sal_Int64 mnChildStates; + + // 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 + bool mbActive; + }; + +} // end of namespace accessibility + +#endif + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |