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/* -*- 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: */
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