pjs/editor/libeditor/base/PlaceholderTxn.cpp

77 строки
2.0 KiB
C++

/* -*- 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 "PlaceholderTxn.h"
#include "nsVoidArray.h"
#if defined(NS_DEBUG) && defined(DEBUG_buster)
static PRBool gNoisy = PR_TRUE;
#else
static const PRBool gNoisy = PR_FALSE;
#endif
PlaceholderTxn::PlaceholderTxn()
: EditAggregateTxn()
{
mAbsorb=PR_TRUE;
}
PlaceholderTxn::~PlaceholderTxn()
{
}
NS_IMETHODIMP PlaceholderTxn::Do(void)
{
if (gNoisy) { printf("PlaceholderTxn Do\n"); }
return NS_OK;
}
NS_IMETHODIMP PlaceholderTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
{
// set out param default value
if (nsnull!=aDidMerge)
*aDidMerge=PR_FALSE;
nsresult result = NS_OK;
if ((nsnull!=aDidMerge) && (nsnull!=aTransaction))
{
EditTxn *editTxn = (EditTxn*)aTransaction; //XXX: hack, not safe! need nsIEditTransaction!
if (PR_TRUE==mAbsorb)
{ // yep, it's one of ours. Assimilate it.
AppendChild(editTxn);
*aDidMerge = PR_TRUE;
if (gNoisy) { printf("Placeholder txn assimilated %p\n", aTransaction); }
}
else
{ // let our last child txn make the choice
PRInt32 count = mChildren->Count();
if (0<count)
{
EditTxn *lastTxn = (EditTxn*)(mChildren->ElementAt(count-1));
if (lastTxn)
{
lastTxn->Merge(aDidMerge, aTransaction);
}
}
}
}
return result;
}