gecko/editor/libeditor/base/DeleteTextTxn.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
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* 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
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* ***** END LICENSE BLOCK ***** */
#ifndef DeleteTextTxn_h__
#define DeleteTextTxn_h__
#include "EditTxn.h"
#include "nsIEditor.h"
#include "nsIDOMCharacterData.h"
#include "nsCOMPtr.h"
class nsRangeUpdater;
/**
* A transaction that removes text from a content node.
*/
class DeleteTextTxn : public EditTxn
{
public:
/** initialize the transaction.
* @param aEditor the provider of basic editing operations
* @param aElement the content node to remove text from
* @param aOffset the location in aElement to begin the deletion
* @param aNumCharsToDelete the number of characters to delete. Not the number of bytes!
*/
NS_IMETHOD Init(nsIEditor *aEditor,
nsIDOMCharacterData *aElement,
PRUint32 aOffset,
PRUint32 aNumCharsToDelete,
nsRangeUpdater *aRangeUpdater);
DeleteTextTxn();
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(DeleteTextTxn, EditTxn)
NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr);
NS_DECL_EDITTXN
PRUint32 GetOffset() { return mOffset; }
PRUint32 GetNumCharsToDelete() { return mNumCharsToDelete; }
protected:
/** the provider of basic editing operations */
nsIEditor* mEditor;
/** the text element to operate upon */
nsCOMPtr<nsIDOMCharacterData> mElement;
/** the offset into mElement where the deletion is to take place */
PRUint32 mOffset;
/** the number of characters to delete */
PRUint32 mNumCharsToDelete;
/** the text that was deleted */
nsString mDeletedText;
/** range updater object */
nsRangeUpdater *mRangeUpdater;
};
#endif