pjs/editor/base/SplitElementTxn.cpp

141 строка
3.8 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 "SplitElementTxn.h"
#include "nsIDOMNode.h"
#include "nsIDOMElement.h"
#include "nsIEditorSupport.h"
static NS_DEFINE_IID(kIEditorSupportIID, NS_IEDITORSUPPORT_IID);
// note that aEditor is not refcounted
SplitElementTxn::SplitElementTxn()
: EditTxn()
{
}
NS_IMETHODIMP SplitElementTxn::Init(nsIEditor *aEditor,
nsIDOMNode *aNode,
PRInt32 aOffset)
{
mEditor = do_QueryInterface(aEditor);
mExistingRightNode = do_QueryInterface(aNode);
mOffset = aOffset;
return NS_OK;
}
SplitElementTxn::~SplitElementTxn()
{
}
NS_IMETHODIMP SplitElementTxn::Do(void)
{
// create a new node
nsresult result = mExistingRightNode->CloneNode(PR_FALSE, getter_AddRefs(mNewLeftNode));
NS_ASSERTION(((NS_SUCCEEDED(result)) && (mNewLeftNode)), "could not create element.");
if ((NS_SUCCEEDED(result)) && (mNewLeftNode))
{
// get the parent node
result = mExistingRightNode->GetParentNode(getter_AddRefs(mParent));
// insert the new node
if ((NS_SUCCEEDED(result)) && (mParent))
{
nsCOMPtr<nsIEditorSupport> editor;
result = mEditor->QueryInterface(kIEditorSupportIID, getter_AddRefs(editor));
if (NS_SUCCEEDED(result) && editor) {
result = editor->SplitNodeImpl(mExistingRightNode, mOffset, mNewLeftNode, mParent);
}
else {
result = NS_ERROR_NOT_IMPLEMENTED;
}
}
}
return result;
}
NS_IMETHODIMP SplitElementTxn::Undo(void)
{
// this assumes Do inserted the new node in front of the prior existing node
nsresult result;
nsCOMPtr<nsIEditorSupport> editor;
result = mEditor->QueryInterface(kIEditorSupportIID, getter_AddRefs(editor));
if (NS_SUCCEEDED(result) && editor) {
result = editor->JoinNodesImpl(mExistingRightNode, mNewLeftNode, mParent, PR_FALSE);
}
else {
result = NS_ERROR_NOT_IMPLEMENTED;
}
return result;
}
NS_IMETHODIMP SplitElementTxn::Redo(void)
{
nsresult result;
nsCOMPtr<nsIEditorSupport> editor;
result = mEditor->QueryInterface(kIEditorSupportIID, getter_AddRefs(editor));
if (NS_SUCCEEDED(result) && editor) {
result = editor->SplitNodeImpl(mExistingRightNode, mOffset, mNewLeftNode, mParent);
}
else {
result = NS_ERROR_NOT_IMPLEMENTED;
}
return result;
}
NS_IMETHODIMP SplitElementTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
{
if (nsnull!=aDidMerge)
*aDidMerge=PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP SplitElementTxn::Write(nsIOutputStream *aOutputStream)
{
return NS_OK;
}
NS_IMETHODIMP SplitElementTxn::GetUndoString(nsString **aString)
{
if (nsnull!=aString)
{
**aString="Join Element";
}
return NS_OK;
}
NS_IMETHODIMP SplitElementTxn::GetRedoString(nsString **aString)
{
if (nsnull!=aString)
{
**aString="Split Element";
}
return NS_OK;
}
NS_IMETHODIMP SplitElementTxn::GetNewNode(nsIDOMNode **aNewNode)
{
if (!aNewNode)
return NS_ERROR_NULL_POINTER;
if (!mNewLeftNode)
return NS_ERROR_NOT_INITIALIZED;
*aNewNode = mNewLeftNode;
NS_ADDREF(*aNewNode);
return NS_OK;
}