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| -rw-r--r-- | include/editeng/AccessibleStaticTextBase.hxx | 233 |
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diff --git a/include/editeng/AccessibleStaticTextBase.hxx b/include/editeng/AccessibleStaticTextBase.hxx new file mode 100644 index 000000000..2f2095f07 --- /dev/null +++ b/include/editeng/AccessibleStaticTextBase.hxx @@ -0,0 +1,233 @@ +/* -*- 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_ACCESSIBLESTATICTEXTBASE_HXX +#define INCLUDED_EDITENG_ACCESSIBLESTATICTEXTBASE_HXX + +#include <memory> +#include <tools/gen.hxx> +#include <cppuhelper/implbase2.hxx> +#include <com/sun/star/uno/Reference.hxx> +#include <com/sun/star/accessibility/AccessibleScrollType.hpp> +#include <com/sun/star/accessibility/XAccessibleText.hpp> +#include <com/sun/star/accessibility/XAccessibleTextAttributes.hpp> +#include <com/sun/star/accessibility/TextSegment.hpp> +#include <editeng/editengdllapi.h> + +namespace com::sun::star::accessibility { class XAccessible; } + +class SvxEditSource; + +namespace accessibility +{ + + class AccessibleStaticTextBase_Impl; + + typedef ::cppu::ImplHelper2< + css::accessibility::XAccessibleText, + css::accessibility::XAccessibleTextAttributes > AccessibleStaticTextBase_BASE; + + /** Helper class for objects containing EditEngine/Outliner text + + This class implements the XAccessibleText interface for static + text, somewhat similar to the children of the + AccessibleTextHelper class. Currently, there are no children, + i.e. the whole text is presented in one big chunk. This might + change in the future, if a need for image bullets should + arise. These, by convention, would be represented as children + of the text. + + You have to implement the SvxEditSource, SvxTextForwarder, + SvxViewForwarder and SvxEditViewForwarder interfaces in order + to enable your object to cooperate with this + class. SvxTextForwarder encapsulates the fact that text + objects do not necessarily have an EditEngine at their + disposal, SvxViewForwarder and SvxEditViewForwarder do the + same for the document and the edit view. The three mentioned + forwarder objects are not stored by the AccessibleTextHelper, + but fetched every time from the SvxEditSource. So you are best + off making your SvxEditSource::Get*Forwarder methods cache the + current forwarder. + + As this class is intended for static (i.e. non-changing) text + only, no event broadcasting is necessary. You must handle + visibility by yourself, the bounding boxes returned by + getCharacterBounds() are relative to your accessibility + object. + + @attention All public non-UNO methods (those are the uppercase + ones) must not be called with any mutex hold, except when + calling from the main thread (with holds the solar mutex), + unless stated otherwise. This is because they themselves might + need the solar mutex in addition to the object mutex, and the + ordering of the locking must be: first solar mutex, then + object mutex. Furthermore, state change events might be fired + internally. + + @derive Use this class as a base for objects containing static + edit engine text. To avoid overwriting every interface method + to intercept derived object defunc state, just set NULL as the + edit source. Every interface method will then properly throw + an exception. + */ + class EDITENG_DLLPUBLIC AccessibleStaticTextBase : public AccessibleStaticTextBase_BASE + { + + public: + /** Create accessible text object for given edit source + + @param pEditSource + The edit source to use. Object ownership is transferred + from the caller to the callee. The object listens on the + SvxEditSource for object disposal, so no provisions have + to be taken if the caller destroys the data (e.g. the + model) contained in the given SvxEditSource. + + */ + explicit AccessibleStaticTextBase( ::std::unique_ptr< SvxEditSource > && pEditSource ); + + virtual ~AccessibleStaticTextBase(); + + private: + AccessibleStaticTextBase( const AccessibleStaticTextBase& ) = delete; + AccessibleStaticTextBase& operator= ( const AccessibleStaticTextBase& ) = delete; + + public: + + /** Set the current edit source + + @attention You are required to have the solar mutex + locked, when calling this method. Thus, the method should + only be called from the main office thread. + + The EditSource set here is required to broadcast out the + following hints: SfxHintId::EditSourceParasMoved, + SfxHintId::EditSourceSelectionChanged, SfxHintId::TextModified, + SfxHintId::TextParaInserted, SfxHintId::TextParaRemoved, + SfxHintId::TextHeightChanged, + SfxHintId::TextViewScrolled. Otherwise, not all state changes + will get noticed by the accessibility object. Further + more, when the corresponding core object or the model is + dying, either the edit source must be set to NULL or it + has to broadcast a SfxHintId::Dying hint. + + This class does not have a dispose method, since it is not + a UNO component. Nevertheless, it holds C++ references to + several core objects, so you should issue a + SetEditSource(::std::unique_ptr<SvxEditSource>()) in + your dispose() method. + + @param pEditSource + The new edit source to set. Object ownership is transferred + from the caller to the callee. + */ + void SetEditSource( ::std::unique_ptr< SvxEditSource > && pEditSource ); + + /** Set the event source + + @attention When setting a reference here, you should call + Dispose() when you as the owner are disposing, since until + then this object will hold that reference + + @param rInterface + The interface that should be set as the source for + accessibility events sent by this object. + */ + void SetEventSource( const css::uno::Reference< css::accessibility::XAccessible >& rInterface ); + + /** Set offset of EditEngine from parent + + @attention You are required to have the solar mutex + locked, when calling this method. Thus, the method should + only be called from the main office thread. + + If the origin of the underlying EditEngine does + not correspond to the upper left corner of the object + using this class, you have to specify the offset. + + @param rPoint + The offset in screen coordinates (i.e. pixel) + */ + void SetOffset( const Point& rPoint ); + + /** Drop all references and enter disposed state + + This method drops all references to external objects (also + the event source reference set via SetEventSource()) and + sets the object into the disposed state (i.e. the methods + return default values or throw a uno::DisposedException + exception). + */ + void Dispose(); + + // XAccessibleText interface implementation + virtual sal_Int32 SAL_CALL getCaretPosition() override; + virtual sal_Bool SAL_CALL setCaretPosition( sal_Int32 nIndex ) override; + virtual sal_Unicode SAL_CALL getCharacter( sal_Int32 nIndex ) override; + virtual css::uno::Sequence< css::beans::PropertyValue > SAL_CALL getCharacterAttributes( sal_Int32 nIndex, const css::uno::Sequence< OUString >& aRequestedAttributes ) override; + virtual css::awt::Rectangle SAL_CALL getCharacterBounds( sal_Int32 nIndex ) override; + virtual sal_Int32 SAL_CALL getCharacterCount() override; + virtual sal_Int32 SAL_CALL getIndexAtPoint( const css::awt::Point& aPoint ) override; + virtual OUString SAL_CALL getSelectedText() override; + virtual sal_Int32 SAL_CALL getSelectionStart() override; + virtual sal_Int32 SAL_CALL getSelectionEnd() override; + /// This will only work with a functional SvxEditViewForwarder, i.e. an EditEngine/Outliner in edit mode + virtual sal_Bool SAL_CALL setSelection( sal_Int32 nStartIndex, sal_Int32 nEndIndex ) override; + virtual OUString SAL_CALL getText() override; + virtual OUString SAL_CALL getTextRange( sal_Int32 nStartIndex, sal_Int32 nEndIndex ) override; + /// Does not support AccessibleTextType::SENTENCE (missing feature in EditEngine) + virtual css::accessibility::TextSegment SAL_CALL getTextAtIndex( sal_Int32 nIndex, sal_Int16 aTextType ) override; + /// Does not support AccessibleTextType::SENTENCE (missing feature in EditEngine) + virtual css::accessibility::TextSegment SAL_CALL getTextBeforeIndex( sal_Int32 nIndex, sal_Int16 aTextType ) override; + /// Does not support AccessibleTextType::SENTENCE (missing feature in EditEngine) + virtual css::accessibility::TextSegment SAL_CALL getTextBehindIndex( sal_Int32 nIndex, sal_Int16 aTextType ) override; + /// This will only work with a functional SvxEditViewForwarder, i.e. an EditEngine/Outliner in edit mode + virtual sal_Bool SAL_CALL copyText( sal_Int32 nStartIndex, sal_Int32 nEndIndex ) override; + virtual sal_Bool SAL_CALL scrollSubstringTo( sal_Int32 nStartIndex, sal_Int32 nEndIndex, css::accessibility::AccessibleScrollType aScrollType) override; + + // XAccessibleTextAttributes + virtual css::uno::Sequence< css::beans::PropertyValue > SAL_CALL getDefaultAttributes( const css::uno::Sequence< OUString >& RequestedAttributes ) override; + virtual css::uno::Sequence< css::beans::PropertyValue > SAL_CALL getRunAttributes( sal_Int32 Index, const css::uno::Sequence< OUString >& RequestedAttributes ) override; + + // child-related methods from XAccessibleContext + /// @throws css::uno::RuntimeException + virtual sal_Int32 SAL_CALL getAccessibleChildCount(); + /// @throws css::lang::IndexOutOfBoundsException + /// @throws css::uno::RuntimeException + virtual css::uno::Reference< css::accessibility::XAccessible > SAL_CALL getAccessibleChild( sal_Int32 i ); + + // child-related methods from XAccessibleComponent + /// @throws css::uno::RuntimeException + virtual css::uno::Reference< css::accessibility::XAccessible > SAL_CALL getAccessibleAtPoint( const css::awt::Point& aPoint ); + + protected: + tools::Rectangle GetParagraphBoundingBox() const; + + private: + + /// @dyn + const std::unique_ptr< AccessibleStaticTextBase_Impl > mpImpl; + + }; + +} // end of namespace accessibility + +#endif // INCLUDED_EDITENG_ACCESSIBLESTATICTEXTBASE_HXX + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |