pjs/editor/libeditor/base/DeleteTextTxn.cpp

83 строки
2.1 KiB
C++
Исходник Обычный вид История

/* -*- 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 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "DeleteTextTxn.h"
#include "nsIDOMCharacterData.h"
DeleteTextTxn::DeleteTextTxn()
: EditTxn()
{
}
nsresult DeleteTextTxn::Init(nsIDOMCharacterData *aElement,
PRUint32 aOffset,
PRUint32 aNumCharsToDelete)
{
mElement = aElement;
mOffset = aOffset;
mNumCharsToDelete = aNumCharsToDelete;
mDeletedText = "";
return NS_OK;
}
nsresult DeleteTextTxn::Do(void)
{
// get the text that we're about to delete
nsresult result = mElement->SubstringData(mOffset, mNumCharsToDelete, mDeletedText);
NS_ASSERTION(NS_SUCCEEDED(result), "could not get text to delete.");
return (mElement->DeleteData(mOffset, mNumCharsToDelete));
}
nsresult DeleteTextTxn::Undo(void)
{
return (mElement->InsertData(mOffset, mDeletedText));
}
nsresult DeleteTextTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
{
if (nsnull!=aDidMerge)
*aDidMerge=PR_FALSE;
return NS_OK;
}
nsresult DeleteTextTxn::Write(nsIOutputStream *aOutputStream)
{
return NS_OK;
}
nsresult DeleteTextTxn::GetUndoString(nsString **aString)
{
if (nsnull!=aString)
{
**aString="Insert Text: ";
**aString += mDeletedText;
}
return NS_OK;
}
nsresult DeleteTextTxn::GetRedoString(nsString **aString)
{
if (nsnull!=aString)
{
**aString="Remove Text: ";
**aString += mDeletedText;
}
return NS_OK;
}