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96 строки
3.9 KiB
Plaintext
96 строки
3.9 KiB
Plaintext
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsISupports.idl"
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/*
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* The nsITransaction interface.
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* <P>
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* This interface is implemented by an object that needs to
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* execute some behavior that must be tracked by the transaction manager.
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*/
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[scriptable, uuid(58e330c1-7b48-11d2-98b9-00805f297d89)]
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interface nsITransaction : nsISupports
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{
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/**
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* Executes the transaction.
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*/
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void doTransaction();
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/**
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* Restores the state to what it was before the transaction was executed.
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*/
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void undoTransaction();
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/**
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* Executes the transaction again. Can only be called on a transaction that
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* was previously undone.
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* <P>
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* In most cases, the redoTransaction() method will actually call the
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* doTransaction() method to execute the transaction again.
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*/
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void redoTransaction();
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/**
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* The transaction's transient state. This attribute is checked by
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* the transaction manager after the transaction's Execute() method is called.
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* If the transient state is false, a reference to the transaction is
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* held by the transaction manager so that the transactions' undoTransaction()
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* and redoTransaction() methods can be called. If the transient state is
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* true, the transaction manager returns immediately after the transaction's
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* doTransaction() method is called, no references to the transaction are
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* maintained. Transient transactions cannot be undone or redone by the
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* transaction manager.
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*/
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readonly attribute boolean isTransient;
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/**
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* Attempts to merge a transaction into "this" transaction. Both transactions
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* must be in their undo state, doTransaction() methods already called. The
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* transaction manager calls this method to coalesce a new transaction with
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* the transaction on the top of the undo stack.
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* This method returns a boolean value that indicates the merge result.
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* A true value indicates that the transactions were merged successfully,
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* a false value if the merge was not possible or failed. If true,
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* the transaction manager will Release() the new transacton instead of
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* pushing it on the undo stack.
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* @param aTransaction the previously executed transaction to merge.
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*/
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boolean merge(in nsITransaction aTransaction);
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};
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