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- /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
- /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla 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/MPL/
- *
- * 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 the Initial Developer are Copyright (C) 1998
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either of the GNU General Public License Version 2 or later (the "GPL"),
- * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
- #include "nsISupports.idl"
-
- /*
- * The nsITransaction interface.
- * <P>
- * This interface is implemented by an object that needs to
- * execute some behavior that must be tracked by the transaction manager.
- */
- [scriptable, uuid(58e330c1-7b48-11d2-98b9-00805f297d89)]
- interface nsITransaction : nsISupports
- {
- /**
- * Executes the transaction.
- */
- void doTransaction();
-
- /**
- * Restores the state to what it was before the transaction was executed.
- */
- void undoTransaction();
-
- /**
- * Executes the transaction again. Can only be called on a transaction that
- * was previously undone.
- * <P>
- * In most cases, the redoTransaction() method will actually call the
- * doTransaction() method to execute the transaction again.
- */
- void redoTransaction();
-
- /**
- * The transaction's transient state. This attribute is checked by
- * the transaction manager after the transaction's Execute() method is called.
- * If the transient state is false, a reference to the transaction is
- * held by the transaction manager so that the transactions' undoTransaction()
- * and redoTransaction() methods can be called. If the transient state is
- * true, the transaction manager returns immediately after the transaction's
- * doTransaction() method is called, no references to the transaction are
- * maintained. Transient transactions cannot be undone or redone by the
- * transaction manager.
- */
- readonly attribute boolean isTransient;
-
- /**
- * Attempts to merge a transaction into "this" transaction. Both transactions
- * must be in their undo state, doTransaction() methods already called. The
- * transaction manager calls this method to coalesce a new transaction with
- * the transaction on the top of the undo stack.
- * This method returns a boolean value that indicates the merge result.
- * A true value indicates that the transactions were merged successfully,
- * a false value if the merge was not possible or failed. If true,
- * the transaction manager will Release() the new transacton instead of
- * pushing it on the undo stack.
- * @param aTransaction the previously executed transaction to merge.
- */
- boolean merge(in nsITransaction aTransaction);
- };
-
-