pjs/editor/libeditor/base/DeleteTextTxn.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998-1999 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef DeleteTextTxn_h__
#define DeleteTextTxn_h__
#include "EditTxn.h"
#include "nsIEditor.h"
#include "nsIDOMCharacterData.h"
#include "nsCOMPtr.h"
#define DELETE_TEXT_TXN_CID \
{/* 4d3a2720-ac49-11d2-86d8-000064657374 */ \
0x4d3a2720, 0xac49, 0x11d2, \
{0x86, 0xd8, 0x0, 0x0, 0x64, 0x65, 0x73, 0x74} }
/**
* A transaction that removes text from a content node.
*/
class DeleteTextTxn : public EditTxn
{
public:
static const nsIID& GetCID() { static nsIID iid = DELETE_TEXT_TXN_CID; return iid; }
/** 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);
private:
DeleteTextTxn();
public:
virtual ~DeleteTextTxn();
NS_IMETHOD Do(void);
NS_IMETHOD Undo(void);
NS_IMETHOD Merge(PRBool *aDidMerge, nsITransaction *aTransaction);
NS_IMETHOD Write(nsIOutputStream *aOutputStream);
NS_IMETHOD GetUndoString(nsString *aString);
NS_IMETHOD GetRedoString(nsString *aString);
enum { kTransactionID = 11130 };
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;
friend class TransactionFactory;
};
#endif