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142 lines
3.9 KiB
C++
142 lines
3.9 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 "CreateElementTxn.h"
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#include "editor.h"
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#include "nsIDOMNode.h"
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#include "nsIDOMNodeList.h"
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#include "nsIDOMDocument.h"
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#include "nsIDOMElement.h"
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// note that aEditor is not refcounted
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CreateElementTxn::CreateElementTxn(nsEditor *aEditor,
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nsIDOMDocument *aDoc,
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const nsString& aTag,
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nsIDOMNode *aParent,
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PRUint32 aOffsetInParent)
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: EditTxn(aEditor)
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{
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mDoc = aDoc;
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NS_ADDREF(mDoc);
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mTag = aTag;
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mParent = aParent;
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NS_ADDREF(mParent);
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mOffsetInParent = aOffsetInParent;
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mNewNode = nsnull;
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mRefNode = nsnull;
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}
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CreateElementTxn::~CreateElementTxn()
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{
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NS_IF_RELEASE(mDoc);
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NS_IF_RELEASE(mParent);
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NS_IF_RELEASE(mNewNode);
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}
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nsresult CreateElementTxn::Do(void)
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{
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// create a new node
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nsresult result = mDoc->CreateElement(mTag, &mNewNode);
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NS_ASSERTION(((NS_SUCCEEDED(result)) && (nsnull!=mNewNode)), "could not create element.");
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if ((NS_SUCCEEDED(result)) && (nsnull!=mNewNode))
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{
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// insert the new node
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nsIDOMNode *resultNode=nsnull;
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if (CreateElementTxn::eAppend==mOffsetInParent)
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{
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result = mParent->AppendChild(mNewNode, &resultNode);
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if ((NS_SUCCEEDED(result)) && (nsnull!=resultNode))
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NS_RELEASE(resultNode); // this object already holds a ref from CreateElement
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}
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else
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{
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nsCOMPtr<nsIDOMNodeList> childNodes;
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result = mParent->GetChildNodes(getter_AddRefs(childNodes));
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if ((NS_SUCCEEDED(result)) && (childNodes))
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{
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result = childNodes->Item(mOffsetInParent, &mRefNode);
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if ((NS_SUCCEEDED(result)) && (nsnull!=mRefNode))
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{
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result = mParent->InsertBefore(mNewNode, mRefNode, &resultNode);
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if ((NS_SUCCEEDED(result)) && (nsnull!=resultNode))
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NS_RELEASE(resultNode); // this object already holds a ref from CreateElement
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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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nsresult CreateElementTxn::Undo(void)
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{
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nsIDOMNode *resultNode=nsnull;
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nsresult result = mParent->RemoveChild(mNewNode, &resultNode);
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if ((NS_SUCCEEDED(result)) && (nsnull!=resultNode))
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NS_RELEASE(resultNode);
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return result;
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}
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nsresult CreateElementTxn::Redo(void)
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{
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nsIDOMNode *resultNode=nsnull;
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nsresult result = mParent->InsertBefore(mNewNode, mRefNode, &resultNode);
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if ((NS_SUCCEEDED(result)) && (nsnull!=resultNode))
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NS_RELEASE(resultNode);
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return result;
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}
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nsresult CreateElementTxn::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 CreateElementTxn::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 CreateElementTxn::Write(nsIOutputStream *aOutputStream)
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{
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return NS_OK;
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}
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nsresult CreateElementTxn::GetUndoString(nsString **aString)
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{
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if (nsnull!=aString)
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{
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**aString="Remove Element: ";
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**aString += mTag;
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}
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return NS_OK;
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}
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nsresult CreateElementTxn::GetRedoString(nsString **aString)
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{
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if (nsnull!=aString)
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{
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**aString="Create Element: ";
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**aString += mTag;
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}
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return NS_OK;
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}
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