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87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "DeleteTextTxn.h"
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#include "editor.h"
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#include "nsIDOMCharacterData.h"
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// note that aEditor is not refcounted
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DeleteTextTxn::DeleteTextTxn(nsEditor *aEditor,
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nsIDOMCharacterData *aElement,
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PRUint32 aOffset,
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PRUint32 aNumCharsToDelete)
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: EditTxn(aEditor)
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{
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mElement = aElement;
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mOffset = aOffset;
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mNumCharsToDelete = aNumCharsToDelete;
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mDeletedText = "";
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}
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nsresult DeleteTextTxn::Do(void)
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{
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// get the text that we're about to delete
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nsresult result = mElement->SubstringData(mOffset, mNumCharsToDelete, mDeletedText);
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NS_ASSERTION(NS_SUCCEEDED(result), "could not get text to delete.");
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return (mElement->DeleteData(mOffset, mNumCharsToDelete));
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}
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nsresult DeleteTextTxn::Undo(void)
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{
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return (mElement->InsertData(mOffset, mDeletedText));
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}
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nsresult DeleteTextTxn::GetIsTransient(PRBool *aIsTransient)
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{
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if (nsnull!=aIsTransient)
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*aIsTransient = PR_FALSE;
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return NS_OK;
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}
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nsresult DeleteTextTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
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{
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if (nsnull!=aDidMerge)
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*aDidMerge=PR_FALSE;
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return NS_OK;
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}
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nsresult DeleteTextTxn::Write(nsIOutputStream *aOutputStream)
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{
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return NS_OK;
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}
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nsresult DeleteTextTxn::GetUndoString(nsString **aString)
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{
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if (nsnull!=aString)
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{
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**aString="Insert Text: ";
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**aString += mDeletedText;
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}
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return NS_OK;
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}
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nsresult DeleteTextTxn::GetRedoString(nsString **aString)
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{
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if (nsnull!=aString)
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{
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**aString="Remove Text: ";
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**aString += mDeletedText;
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}
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return NS_OK;
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}
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