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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the demonstration applications of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #include "autosaver.h" |
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43 |
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44 #include <QtCore/QDir> |
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45 #include <QtCore/QCoreApplication> |
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46 #include <QtCore/QMetaObject> |
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47 #include <QtDebug> |
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48 |
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49 #define AUTOSAVE_IN 1000 * 3 // seconds |
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50 #define MAXWAIT 1000 * 15 // seconds |
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51 |
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52 AutoSaver::AutoSaver(QObject *parent) : QObject(parent) |
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53 { |
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54 Q_ASSERT(parent); |
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55 } |
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56 |
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57 AutoSaver::~AutoSaver() |
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58 { |
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59 if (m_timer.isActive()) |
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60 qWarning() << "AutoSaver: still active when destroyed, changes not saved."; |
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61 } |
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62 |
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63 void AutoSaver::changeOccurred() |
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64 { |
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65 if (m_firstChange.isNull()) |
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66 m_firstChange.start(); |
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67 |
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68 if (m_firstChange.elapsed() > MAXWAIT) { |
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69 saveIfNeccessary(); |
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70 } else { |
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71 m_timer.start(AUTOSAVE_IN, this); |
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72 } |
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73 } |
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74 |
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75 void AutoSaver::timerEvent(QTimerEvent *event) |
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76 { |
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77 if (event->timerId() == m_timer.timerId()) { |
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78 saveIfNeccessary(); |
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79 } else { |
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80 QObject::timerEvent(event); |
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81 } |
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82 } |
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83 |
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84 void AutoSaver::saveIfNeccessary() |
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85 { |
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86 if (!m_timer.isActive()) |
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87 return; |
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88 m_timer.stop(); |
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89 m_firstChange = QTime(); |
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90 if (!QMetaObject::invokeMethod(parent(), "save", Qt::DirectConnection)) { |
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91 qWarning() << "AutoSaver: error invoking slot save() on parent"; |
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92 } |
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93 } |
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94 |