gecko-dev/editor/base/SplitElementTxn.h

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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.
*/
#ifndef SplitElementTxn_h__
#define SplitElementTxn_h__
#include "EditTxn.h"
#include "nsIDOMNode.h"
#include "nsCOMPtr.h"
#include "nsIEditor.h"
#define SPLIT_ELEMENT_TXN_CID \
{/* 690c6290-ac48-11d2-86d8-000064657374 */ \
0x690c6290, 0xac48, 0x11d2, \
{0x86, 0xd8, 0x0, 0x0, 0x64, 0x65, 0x73, 0x74} }
/**
* A transaction that splits an element E into two identical nodes, E1 and E2
* with the children of E divided between E1 and E2.
*/
class SplitElementTxn : public EditTxn
{
public:
static const nsIID& GetCID() { static nsIID iid = SPLIT_ELEMENT_TXN_CID; return iid; }
/** initialize the transaction.
* @param aEditor the provider of core editing operations
* @param aNode the node to split
* @param aOffset the location within aNode to do the split.
* aOffset may refer to children of aNode, or content of aNode.
* The left node will have child|content 0..aOffset-1.
*/
NS_IMETHOD Init (nsIEditor *aEditor,
nsIDOMNode *aNode,
PRInt32 aOffset);
protected:
SplitElementTxn();
public:
virtual ~SplitElementTxn();
NS_IMETHOD Do(void);
NS_IMETHOD Undo(void);
NS_IMETHOD Redo(void);
NS_IMETHOD Merge(PRBool *aDidMerge, nsITransaction *aTransaction);
NS_IMETHOD Write(nsIOutputStream *aOutputStream);
NS_IMETHOD GetUndoString(nsString *aString);
NS_IMETHOD GetRedoString(nsString *aString);
NS_IMETHOD GetNewNode(nsIDOMNode **aNewNode);
protected:
/** the element to operate upon */
nsCOMPtr<nsIDOMNode> mExistingRightNode;
/** the offset into mElement where the children of mElement are split.<BR>
* mOffset is the index of the first child in the right node.
* -1 means the new node gets no children.
*/
PRInt32 mOffset;
/** the element we create when splitting mElement */
nsCOMPtr<nsIDOMNode> mNewLeftNode;
/** the parent shared by mExistingRightNode and mNewLeftNode */
nsCOMPtr<nsIDOMNode> mParent;
nsIEditor* mEditor;
friend class TransactionFactory;
};
#endif