editor/txmgr/idl/nsITransaction.idl
author Boris Zbarsky <bzbarsky@mit.edu>
Mon, 05 Nov 2012 10:20:04 -0500
changeset 112308 0b9b3b2b89712b7f256dd76c5b55719a15dc0dd8
parent 94475 f4157e8c410708d76703f19e4dfb61859bfe32d8
child 190641 645ad2c2411421798c8e815bcd74aa8092aa066f
permissions -rw-r--r--
Bug 807222 part 3. Make sure we enter the right compartment before we try to define interface constants on a constructor. r=bholley

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#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);
};