d4f78fa3b6
Change-Id: I4ae8de558550e6577c28b95e0aaed74f00d79c29 Reviewed-on: https://gerrit.libreoffice.org/30650 Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk> Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>
370 lines
15 KiB
C++
370 lines
15 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#ifndef INCLUDED_SVX_ACCESSIBLETEXTHELPER_HXX
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#define INCLUDED_SVX_ACCESSIBLETEXTHELPER_HXX
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#include <memory>
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#include <sal/types.h>
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#include <tools/gen.hxx>
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#include <com/sun/star/uno/Reference.hxx>
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#include <com/sun/star/accessibility/XAccessible.hpp>
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#include <com/sun/star/accessibility/XAccessibleContext.hpp>
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#include <com/sun/star/accessibility/XAccessibleComponent.hpp>
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#include <com/sun/star/accessibility/XAccessibleEventBroadcaster.hpp>
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#include <svx/svxdllapi.h>
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class SvxTextForwarder;
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class SvxViewForwarder;
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class SvxEditSource;
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namespace accessibility
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{
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class AccessibleTextHelper_Impl;
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/** Helper class for objects containing EditEngine/Outliner text
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This class provides the methods from the XAccessibleContext,
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XAccessibleEventBroadcaster and XAccessibleComponent
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interfaces, that are common to all accessible objects
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containing an edit engine.
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The text contained in the EditEngine/Outliner is presented as
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children of this class, namely for every text paragraph a
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AccessibleEditableTextPara child object is generated. As this
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class manages these children for itself, it has to send out
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AccessibleEventId::CHILD events on your
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behalf. Thus, you must forward every call to your
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addEventListener()/removeEventListener() methods to the
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AccessibleTextHelper (methods
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AddEventListener/RemoveEventListener), otherwise none or not
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every one of your event listener will notice child changes.
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You have to implement the SvxEditSource, SvxTextForwarder,
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SvxViewForwarder and SvxEditViewForwarder interfaces in order
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to enable your object to cooperate with this
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class. SvxTextForwarder encapsulates the fact that text
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objects do not necessarily have an EditEngine at their
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disposal, SvxViewForwarder and SvxEditViewForwarder do the
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same for the document and the edit view. The three mentioned
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forwarder objects are not stored by the AccessibleTextHelper,
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but fetched every time from the SvxEditSource. So you are best
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off making your SvxEditSource::Get*Forwarder methods cache the
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current forwarder.
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To support changes in edit mode or conversion of fixed text
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into EditEngine text, you can change the SvxEditSource this
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class is referring to. This might render all children invalid
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and change the child count, since the AccessibleTextHelper
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reinitializes itself from scratch.
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This class registers itself at the SvxEditSource as a state
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listener and manages the state of its children (i.e. the
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paragraphs). See the method documentation of
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AccessibleTextHelper::SetEditSource for the expected
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events. Generally, be prepared that when sending any of these
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events via SvxEditSource::GetBroadcaster() broadcaster, the
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AccessibleTextHelper will call the SvxEditSource and their
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forwarder to update it's state. Avoid being inconsistent in
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the facts you tell in the events, e.g. when sending a
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TEXT_HINT_PARAINSERTED event, the
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SvxEditSource::GetTextForwarder().GetParagraphCount() should
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already include the newly inserted paragraph.
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@attention All public methods must not be called with any
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mutex hold, except when calling from the main thread (with
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holds the solar mutex), unless stated otherwise. This is
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because they themselves might need the solar mutex in addition
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to the object mutex, and the ordering of the locking must be:
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first solar mutex, then object mutex. Furthermore, state
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change events might be fired internally.
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@derive Use this class in an aggregation and forward, or
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derive from it and overwrite.
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too.
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@see SvxEditSource
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@see SvxTextForwarder
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@see SvxViewForwarder
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@see SvxEditViewForwarder
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*/
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class SVX_DLLPUBLIC AccessibleTextHelper final
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{
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public:
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typedef ::std::vector< sal_Int16 > VectorOfStates;
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/** Create accessible text object for given edit source
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@param pEditSource
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The edit source to use. Object ownership is transferred
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from the caller to the callee. The object listens on the
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SvxEditSource for object disposal, so no provisions have
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to be taken if the caller destroys the data (e.g. the
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model) contained in the given SvxEditSource.
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*/
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explicit AccessibleTextHelper( ::std::unique_ptr< SvxEditSource > && pEditSource );
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~AccessibleTextHelper();
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protected:
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// declared, but not defined
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AccessibleTextHelper( const AccessibleTextHelper& );
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// declared, but not defined
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AccessibleTextHelper& operator= ( const AccessibleTextHelper& );
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public:
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/** Query the current edit source
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@attention This method returns by reference, so you are
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responsible for serialization (typically, you acquired the
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solar mutex when calling this method). Thus, the method
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should only be called from the main office thread.
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*/
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const SvxEditSource& GetEditSource() const;
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/** Set the current edit source
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@attention Might fire state change events, therefore,
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don't hold any mutex except solar mutex, which you are
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required to lock before. This method should only be called
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from the main office thread.
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The EditSource set here is required to broadcast out the
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following hints: EDITSOURCE_HINT_PARASMOVED,
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EDITSOURCE_HINT_SELECTIONCHANGED, TEXT_HINT_MODIFIED,
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TEXT_HINT_PARAINSERTED, TEXT_HINT_PARAREMOVED,
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TEXT_HINT_TEXTHEIGHTCHANGED,
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TEXT_HINT_VIEWSCROLLED. Otherwise, not all state changes
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will get noticed by the accessibility object. Further
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more, when the corresponding core object or the model is
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dying, either the edit source must be set to NULL or it
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has to broadcast a SFX_HINT_DYING hint.
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If the SvxEditSource's managed text can change between
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edit/non-edit mode (i.e. there are times when
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SvxEditSource::GetEditViewForwarder(sal_False) returns
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NULL), then the two additional hints are required:
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SdrHintKind::BeginEdit and SdrHintKind::EndEdit. When the
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AccessibleTextHelper receives a SdrHintKind::BeginEdit, it expects
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the SvxEditSource already in edit mode. On a SdrHintKind::EndEdit,
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edit mode must already been left. The rationale for these
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events are the fact that focus and selection have to be
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updated in edit mode, and completely relinquished and
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reset to the parent (for the focus) in non-edit mode.
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This class does not have a dispose method, since it is not
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a UNO component. Nevertheless, it holds C++ references to
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several core objects, so you should issue a
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SetEditSource(::std::unique_ptr<SvxEditSource>()) in
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your dispose() method.
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@param pEditSource
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The new edit source to set. Object ownership is transferred
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from the caller to the callee.
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*/
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void SetEditSource( ::std::unique_ptr< SvxEditSource > && pEditSource );
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/** Set the event source
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You should set the event source before registering any
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event listener and before requesting any child. Children
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of this object receive the event source as their parent
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accessible object. That is, the event source is best set
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in your object's init method.
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@attention When setting a reference here, you should call
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Dispose() when you as the owner are disposing, since until
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then this object will hold that reference
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@param rInterface
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The interface that should be set as the source for
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accessibility events sent by this object.
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*/
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void SetEventSource( const css::uno::Reference< css::accessibility::XAccessible >& rInterface );
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/** Set offset of EditEngine/Outliner from parent
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If the origin of the underlying EditEngine/Outliner does
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not correspond to the upper left corner of the object
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using this class, you have to specify the offset.
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@attention Might fire state change events, therefore,
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don't hold any mutex except solar mutex, which you are
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required to lock before. This method should only be called
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from the main office thread.
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@param rPoint
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The offset in screen coordinates (i.e. pixel)
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*/
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void SetOffset( const Point& rPoint );
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/** Set offset the object adds to all children's indices
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This can be used if the owner of this object has children
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handled by itself. Setting an offset different from 0
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leads to this object mimicking that all its children are
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within the range [nOffset, GetChildCount()+nOffset). That
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means, GetChild() also expects the index to be in this
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range.
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@attention Might fire state change events, therefore,
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don't hold any mutex except solar mutex, which you are
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required to lock before. This method should only be called
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from the main office thread.
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@param nOffset
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The offset to add to every children's index.
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*/
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void SetStartIndex( sal_Int32 nOffset );
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/** Query offset the object adds to all children's indices
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@return the offset to add to every children's index.
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*/
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sal_Int32 GetStartIndex() const;
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/** Sets a vector of additional accessible states.
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The states are passed to every created child object
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(text paragraph). The state values are defined in
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css::accessibility::AccessibleStateType.
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This function has to be called before querying for
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any children (e.g. with GetChild()).
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*/
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void SetAdditionalChildStates( const VectorOfStates& rChildStates );
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/** Update the visible children
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@attention Might fire state change events, therefore,
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don't hold any mutex except solar mutex, which you are
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required to lock before. This method should only be called
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from the main office thread.
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This method reevaluates the visibility of all
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children. Call this method if your visibility state has
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changed somehow, e.g. if the visible area has changed and
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the AccessibleTextHelper isn't notified internally
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(e.g. via TEXT_HINT_VIEWSCROLLED). Normally, there should
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not be a need to call this method.
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*/
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void UpdateChildren();
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/** Drop all references and enter disposed state
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This method drops all references to external objects (also
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the event source reference set via SetEventSource()) and
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sets the object into the disposed state (i.e. the methods
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return default values or throw a uno::DisposedException
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exception).
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*/
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void Dispose();
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/** Set the focus state of the accessibility object
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Since this class handles children which also might get the
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focus, the user of this class is encouraged to delegate
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focus handling. Whenever the focus state of the
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surrounding object changes, this method has to be called.
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The protocol of focus handling for a user of this class is
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then to call SetFocus() with the appropriate focus state,
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and HaveFocus() to determine the focus state you tell the
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outside.
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@attention Might fire state change events, therefore,
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don't hold any mutex except solar mutex, which you are
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required to lock before. This method should only be called
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from the main office thread.
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@param bHaveFocus
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Whether we got or we lost the focus. Set to true if
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focus is gotten, false otherwise.
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@see HaveFocus()
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*/
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void SetFocus( bool bHaveFocus = true );
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/** Query the focus state of the surrounding object
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If focus handling is delegated to this class, determine
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focus state with this method. Be prepared that even if you
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set the focus with SetFocus(true), this method might
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return false. This is the case if one of the children
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actually got the focus.
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@return the state of the focus ownership
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*/
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bool HaveFocus();
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// XAccessibleContext child handling methods
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/** Implements getAccessibleChildCount
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@attention Don't call with locked mutexes. You may hold
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the solar mutex, but this method acquires it anyway.
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*/
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sal_Int32 GetChildCount();
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/** Implements getAccessibleChild
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@attention Don't call with locked mutexes. You may hold
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the solar mutex, but this method acquires it anyway.
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*/
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css::uno::Reference< css::accessibility::XAccessible > GetChild( sal_Int32 i );
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// XAccessibleEventBroadcaster child related methods
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/** Implements addEventListener
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@attention Don't call with locked mutexes
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*/
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void AddEventListener( const css::uno::Reference< css::accessibility::XAccessibleEventListener >& xListener );
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/** Implements removeEventListener
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@attention Don't call with locked mutexes
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*/
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void RemoveEventListener( const css::uno::Reference< css::accessibility::XAccessibleEventListener >& xListener );
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// XAccessibleComponent child related methods
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/** Implements getAccessibleAt
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@attention Don't call with locked mutexes. You may hold
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the solar mutex, but this method acquires it anyway.
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*/
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css::uno::Reference< css::accessibility::XAccessible > SAL_CALL GetAt( const css::awt::Point& aPoint );
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private:
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/// @dyn
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const std::unique_ptr< AccessibleTextHelper_Impl > mpImpl;
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};
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} // end of namespace accessibility
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#endif // INCLUDED_SVX_ACCESSIBLETEXTHELPER_HXX
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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