pjs/editor/libeditor/base/JoinElementTxn.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 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998-1999 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef JoinElementTxn_h__
#define JoinElementTxn_h__
#include "EditTxn.h"
#include "nsIDOMNode.h"
#include "nsCOMPtr.h"
#include "nsIEditor.h"
#define JOIN_ELEMENT_TXN_CID \
{/* 9bc5f9f0-ac48-11d2-86d8-000064657374 */ \
0x9bc5f9f0, 0xac48, 0x11d2, \
{0x86, 0xd8, 0x0, 0x0, 0x64, 0x65, 0x73, 0x74} }
class nsEditor;
/**
* A transaction that joins two elements E1 (left node) and E2 (right node)
* into a single node E.
* The children of E are the children of E1 followed by the children of E2.
* After Do() and Redo(), E1 is removed from the content tree and E2 remains.
*/
class JoinElementTxn : public EditTxn
{
public:
static const nsIID& GetCID() { static nsIID iid = JOIN_ELEMENT_TXN_CID; return iid; }
/** initialize the transaction
* @param aEditor the provider of core editing operations
* @param aLeftNode the first of two nodes to join
* @param aRightNode the second of two nodes to join
*/
NS_IMETHOD Init(nsEditor *aEditor,
nsIDOMNode *aLeftNode,
nsIDOMNode *aRightNode);
protected:
JoinElementTxn();
public:
virtual ~JoinElementTxn();
NS_IMETHOD Do(void);
NS_IMETHOD Undo(void);
// NS_IMETHOD Redo(void);
NS_IMETHOD GetIsTransient(PRBool *aIsTransient);
NS_IMETHOD Merge(PRBool *aDidMerge, nsITransaction *aTransaction);
NS_IMETHOD Write(nsIOutputStream *aOutputStream);
NS_IMETHOD GetUndoString(nsString *aString);
NS_IMETHOD GetRedoString(nsString *aString);
enum { kTransactionID = 11200 };
protected:
/** the elements to operate upon.
* After the merge, mRightNode remains and mLeftNode is removed from the content tree.
*/
nsCOMPtr<nsIDOMNode> mLeftNode;
nsCOMPtr<nsIDOMNode> mRightNode;
/** the offset into mNode where the children of mElement are split (for undo).<BR>
* mOffset is the index of the first child in the right node.
* -1 means the left node had no children.
*/
PRUint32 mOffset;
/** the parent node containing mLeftNode and mRightNode */
nsCOMPtr<nsIDOMNode> mParent;
nsEditor* mEditor;
friend class TransactionFactory;
};
#endif