gecko-dev/editor/base/CreateElementTxn.cpp

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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 1.0 (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 "CreateElementTxn.h"
#include "nsIDOMNodeList.h"
CreateElementTxn::CreateElementTxn()
: EditTxn()
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{
}
nsresult CreateElementTxn::Init(nsIDOMDocument *aDoc,
const nsString& aTag,
nsIDOMNode *aParent,
PRUint32 aOffsetInParent)
{
if ((nsnull!=aDoc) && (nsnull!=aParent))
{
mDoc = aDoc;
mTag = aTag;
mParent = aParent;
mOffsetInParent = aOffsetInParent;
mNewNode = nsnull;
mRefNode = nsnull;
return NS_OK;
}
else
return NS_ERROR_NULL_POINTER;
}
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CreateElementTxn::~CreateElementTxn()
{
}
nsresult CreateElementTxn::Do(void)
{
// create a new node
nsresult result = mDoc->CreateElement(mTag, getter_AddRefs(mNewNode));
NS_ASSERTION(((NS_SUCCEEDED(result)) && (mNewNode)), "could not create element.");
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if ((NS_SUCCEEDED(result)) && (mNewNode))
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{
// insert the new node
nsCOMPtr<nsIDOMNode> resultNode;
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if (CreateElementTxn::eAppend==mOffsetInParent)
{
result = mParent->AppendChild(mNewNode, getter_AddRefs(resultNode));
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}
else
{
nsCOMPtr<nsIDOMNodeList> childNodes;
result = mParent->GetChildNodes(getter_AddRefs(childNodes));
if ((NS_SUCCEEDED(result)) && (childNodes))
{
result = childNodes->Item(mOffsetInParent, getter_AddRefs(mRefNode));
if ((NS_SUCCEEDED(result)) && (mRefNode))
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{
result = mParent->InsertBefore(mNewNode, mRefNode, getter_AddRefs(resultNode));
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}
}
}
}
return result;
}
nsresult CreateElementTxn::Undo(void)
{
nsCOMPtr<nsIDOMNode> resultNode;
nsresult result = mParent->RemoveChild(mNewNode, getter_AddRefs(resultNode));
return result;
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}
nsresult CreateElementTxn::Redo(void)
{
nsCOMPtr<nsIDOMNode> resultNode;
nsresult result = mParent->InsertBefore(mNewNode, mRefNode, getter_AddRefs(resultNode));
return result;
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}
nsresult CreateElementTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
{
if (nsnull!=aDidMerge)
*aDidMerge=PR_FALSE;
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return NS_OK;
}
nsresult CreateElementTxn::Write(nsIOutputStream *aOutputStream)
{
return NS_OK;
}
nsresult CreateElementTxn::GetUndoString(nsString **aString)
{
if (nsnull!=aString)
{
**aString="Remove Element: ";
**aString += mTag;
}
return NS_OK;
}
nsresult CreateElementTxn::GetRedoString(nsString **aString)
{
if (nsnull!=aString)
{
**aString="Create Element: ";
**aString += mTag;
}
return NS_OK;
}