1998-11-19 01:29:44 +03:00
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/* -*- 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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#ifndef nsITransactionManager_h__
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#define nsITransactionManager_h__
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#include "nsISupports.h"
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#include "nsIOutputStream.h"
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1998-11-19 04:40:53 +03:00
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#include "nsITransaction.h"
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// #include "nsITransactionListener.h"
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1998-11-19 01:29:44 +03:00
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/*
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Transaction Manager interface to outside world
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*/
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#define NS_TRANSACTION_MANAGER_IID \
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{ /* 58E330C2-7B48-11d2-98B9-00805F297D89 */ \
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0x58e330c2, 0x7b48, 0x11d2, \
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{ 0x98, 0xb9, 0x0, 0x80, 0x5f, 0x29, 0x7d, 0x89 } };
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/**
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* A transaction manager specific interface.
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* <P>
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* It's implemented by an object that tracks transactions.
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*/
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class nsITransactionManager : public nsISupports{
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public:
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/**
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1998-11-19 04:40:53 +03:00
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* Execute() calls the transaction's Execute() method and pushes it
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* on the undo queue. Execute() calls the transaction's AddRef() method.
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* The transaction's Release() method will be called when the undo or redo
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* stack is pruned or when the transaction manager is destroyed.
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*
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1998-11-19 01:29:44 +03:00
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* @param nsITransaction *tx the transaction to execute.
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*/
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virtual nsresult Execute(nsITransaction *tx) = 0;
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/**
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1998-11-19 04:40:53 +03:00
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* Undo() pops the specified number of transactions off the undo stack,
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* calls their Undo() method, and pushes them onto the redo stack.
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*
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* @param PRInt32 n number of transactions to undo. n <= 0 means undo all
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* transactions.
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1998-11-19 01:29:44 +03:00
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*/
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virtual nsresult Undo(PRInt32 n) = 0;
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/**
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1998-11-19 04:40:53 +03:00
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* Redo() pops the specified number of transactions off the redo stack,
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* calls their Redo() method, and pushes them onto the undo stack.
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*
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* @param PRInt32 n number of transactions to redo. n <= 0 means redo all
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* transactions previously undone.
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1998-11-19 01:29:44 +03:00
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*/
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virtual nsresult Redo(PRInt32 n) = 0;
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/**
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1998-11-19 04:40:53 +03:00
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* Write() allows the transaction manager to output a stream representation
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* of itself, it then calls the Write() method of each transaction on the
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* undo and redo stacks.
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*
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* @param nsIOutputStream *os output stream for writing.
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*/
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virtual nsresult Write(nsIOutputStream *os) = 0;
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/**
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* AddListener() adds the specified listener to the transaction manager's
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* list of listeners. The listener is notified whenever a transaction is
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* executed, undone, or redone. AddListener() calls the listener's AddRef()
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* method.
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*
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* @param nsITransactionListener *l the lister to add.
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*/
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// virtual nsresult AddListener(nsITransactionListener *l) = 0;
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/**
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* RemoveListener() removes the specified listener from the transaction
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* manager's list of listeners. Removing a listener that is not on the
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* transaction manager's list does nothing. RemoveListener() calls the
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* listener's Release() method.
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*
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* @param nsITransactionListener *l the lister to add.
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1998-11-19 01:29:44 +03:00
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*/
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1998-11-19 04:40:53 +03:00
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// virtual nsresult RemoveListener(nsITransactionListener *l) = 0;
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1998-11-19 01:29:44 +03:00
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};
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#endif // nsITransactionManager
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