blob: 7e2e2aee4ee67910789374768fb275e812490dcd (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
/* -*- 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);
};
|
