|
1 /**************************************************************************** |
|
2 ** |
|
3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
|
4 ** All rights reserved. |
|
5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
|
6 ** |
|
7 ** This file is part of the demonstration applications of the Qt Toolkit. |
|
8 ** |
|
9 ** $QT_BEGIN_LICENSE:LGPL$ |
|
10 ** No Commercial Usage |
|
11 ** This file contains pre-release code and may not be distributed. |
|
12 ** You may use this file in accordance with the terms and conditions |
|
13 ** contained in the Technology Preview License Agreement accompanying |
|
14 ** this package. |
|
15 ** |
|
16 ** GNU Lesser General Public License Usage |
|
17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
|
18 ** General Public License version 2.1 as published by the Free Software |
|
19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
|
20 ** packaging of this file. Please review the following information to |
|
21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
|
22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
|
23 ** |
|
24 ** In addition, as a special exception, Nokia gives you certain additional |
|
25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
|
26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
|
27 ** |
|
28 ** If you have questions regarding the use of this file, please contact |
|
29 ** Nokia at qt-info@nokia.com. |
|
30 ** |
|
31 ** |
|
32 ** |
|
33 ** |
|
34 ** |
|
35 ** |
|
36 ** |
|
37 ** |
|
38 ** $QT_END_LICENSE$ |
|
39 ** |
|
40 ****************************************************************************/ |
|
41 |
|
42 #include "autosaver.h" |
|
43 |
|
44 #include <QtCore/QDir> |
|
45 #include <QtCore/QCoreApplication> |
|
46 #include <QtCore/QMetaObject> |
|
47 #include <QtDebug> |
|
48 |
|
49 #define AUTOSAVE_IN 1000 * 3 // seconds |
|
50 #define MAXWAIT 1000 * 15 // seconds |
|
51 |
|
52 AutoSaver::AutoSaver(QObject *parent) : QObject(parent) |
|
53 { |
|
54 Q_ASSERT(parent); |
|
55 } |
|
56 |
|
57 AutoSaver::~AutoSaver() |
|
58 { |
|
59 if (m_timer.isActive()) |
|
60 qWarning() << "AutoSaver: still active when destroyed, changes not saved."; |
|
61 } |
|
62 |
|
63 void AutoSaver::changeOccurred() |
|
64 { |
|
65 if (m_firstChange.isNull()) |
|
66 m_firstChange.start(); |
|
67 |
|
68 if (m_firstChange.elapsed() > MAXWAIT) { |
|
69 saveIfNeccessary(); |
|
70 } else { |
|
71 m_timer.start(AUTOSAVE_IN, this); |
|
72 } |
|
73 } |
|
74 |
|
75 void AutoSaver::timerEvent(QTimerEvent *event) |
|
76 { |
|
77 if (event->timerId() == m_timer.timerId()) { |
|
78 saveIfNeccessary(); |
|
79 } else { |
|
80 QObject::timerEvent(event); |
|
81 } |
|
82 } |
|
83 |
|
84 void AutoSaver::saveIfNeccessary() |
|
85 { |
|
86 if (!m_timer.isActive()) |
|
87 return; |
|
88 m_timer.stop(); |
|
89 m_firstChange = QTime(); |
|
90 if (!QMetaObject::invokeMethod(parent(), "save", Qt::DirectConnection)) { |
|
91 qWarning() << "AutoSaver: error invoking slot save() on parent"; |
|
92 } |
|
93 } |
|
94 |