/* -*- 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 EditTxn_h__
#define EditTxn_h__

#include "nsITransaction.h"
#include "nsITransactionDescription.h"
#include "nsCOMPtr.h"

#define EDIT_TXN_CID \
{/* c5ea31b0-ac48-11d2-86d8-000064657374 */ \
0xc5ea31b0, 0xac48, 0x11d2, \
{0x86, 0xd8, 0x0, 0x0, 0x64, 0x65, 0x73, 0x74} }

/**
 * base class for all document editing transactions.
 * provides default concrete behavior for all nsITransaction methods.
 * EditTxns optionally have a name.  This name is for internal purposes only, 
 * it is never seen by the user or by any external entity.
 */
class EditTxn : public nsITransaction
              , public nsITransactionDescription
{
public:

  static const nsIID& GetCID() { static nsIID iid = EDIT_TXN_CID; return iid; }

  NS_DECL_ISUPPORTS

  EditTxn();
  virtual ~EditTxn();


  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 = 11100 };

  NS_DECL_NSITRANSACTIONDESCRIPTION
  nsString mLogDescription;
  int mTransactionID;
};

#endif