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d5932338f7
and merges in subsequent transactions indiscriminately until it's told to stop. It also gives the last transaction in its child list a chance to merge the next transaction. All this is in support of complex transactions that result in text insertion being able to collapse into a single undoable event. Also improved tracking of bogus content node used when document is empty.
75 lines
1.9 KiB
C++
75 lines
1.9 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 "PlaceholderTxn.h"
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#include "nsVoidArray.h"
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#ifdef NS_DEBUG
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static PRBool gNoisy = PR_TRUE;
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#else
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static const PRBool gNoisy = PR_FALSE;
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#endif
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PlaceholderTxn::PlaceholderTxn()
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: EditAggregateTxn()
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{
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mAbsorb=PR_TRUE;
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}
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PlaceholderTxn::~PlaceholderTxn()
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{
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}
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NS_IMETHODIMP PlaceholderTxn::Do(void)
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{
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return NS_OK;
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}
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NS_IMETHODIMP PlaceholderTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
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{
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// set out param default value
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if (nsnull!=aDidMerge)
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*aDidMerge=PR_FALSE;
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nsresult result = NS_OK;
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if ((nsnull!=aDidMerge) && (nsnull!=aTransaction))
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{
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EditTxn *editTxn = (EditTxn*)aTransaction; //XXX: hack, not safe! need nsIEditTransaction!
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if (PR_TRUE==mAbsorb)
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{ // yep, it's one of ours. Assimilate it.
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AppendChild(editTxn);
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*aDidMerge = PR_TRUE;
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}
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else
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{ // let our last child txn make the choice
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PRInt32 count = mChildren->Count();
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if (0<count)
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{
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EditTxn *lastTxn = (EditTxn*)(mChildren->ElementAt(count-1));
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if (lastTxn)
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{
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lastTxn->Merge(aDidMerge, aTransaction);
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}
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}
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}
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}
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return result;
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}
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