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TextUpdater.h
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TextUpdater.h
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Alexander Surkov <surkov.alexander@gmail.com> (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef TextUpdater_h_
#define TextUpdater_h_
#include "AccEvent.h"
#include "nsHyperTextAccessible.h"
/**
* Used to find a difference between old and new text and fire text change
* events.
*/
class TextUpdater
{
public:
/**
* Start text of the text leaf update.
*/
static void Run(nsDocAccessible* aDocument, nsTextAccessible* aTextLeaf,
const nsAString& aNewText);
private:
TextUpdater(nsDocAccessible* aDocument, nsTextAccessible* aTextLeaf) :
mDocument(aDocument), mTextLeaf(aTextLeaf), mHyperText(nsnull),
mTextOffset(-1) { }
~TextUpdater()
{ mDocument = nsnull; mTextLeaf = nsnull; mHyperText = nsnull; }
/**
* Update text of the text leaf accessible, fire text change and value change
* (if applicable) events for its container hypertext accessible.
*/
void DoUpdate(const nsAString& aNewText, const nsAString& aOldText,
PRUint32 aSkipStart);
private:
TextUpdater();
TextUpdater(const TextUpdater&);
TextUpdater& operator=(const TextUpdater&);
/**
* Fire text change events based on difference between strings.
*/
void ComputeTextChangeEvents(const nsAString& aStr1,
const nsAString& aStr2,
PRUint32* aEntries,
nsTArray<nsRefPtr<AccEvent> >& aEvents);
/**
* Helper to create text change events for inserted text.
*/
inline void FireInsertEvent(const nsAString& aText, PRUint32 aAddlOffset,
nsTArray<nsRefPtr<AccEvent> >& aEvents)
{
nsRefPtr<AccEvent> event =
new AccTextChangeEvent(mHyperText, mTextOffset + aAddlOffset,
aText, PR_TRUE);
aEvents.AppendElement(event);
}
/**
* Helper to create text change events for removed text.
*/
inline void FireDeleteEvent(const nsAString& aText, PRUint32 aAddlOffset,
nsTArray<nsRefPtr<AccEvent> >& aEvents)
{
nsRefPtr<AccEvent> event =
new AccTextChangeEvent(mHyperText, mTextOffset + aAddlOffset,
aText, PR_FALSE);
aEvents.AppendElement(event);
}
/**
* Update the text and fire text change/value change events.
*/
void UpdateTextNFireEvent(const nsAString& aNewText,
const nsAString& aChangeText, PRUint32 aAddlOffset,
PRBool aIsInserted);
private:
nsDocAccessible* mDocument;
nsTextAccessible* mTextLeaf;
nsHyperTextAccessible* mHyperText;
PRInt32 mTextOffset;
};
#endif