1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2015 The Qt Company Ltd. 4 ** Contact: http://www.qt.io/licensing/ 5 ** 6 ** This file is part of the demonstration applications of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL21$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see http://www.qt.io/terms-conditions. For further 15 ** information use the contact form at http://www.qt.io/contact-us. 16 ** 17 ** GNU Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 2.1 or version 3 as published by the Free 20 ** Software Foundation and appearing in the file LICENSE.LGPLv21 and 21 ** LICENSE.LGPLv3 included in the packaging of this file. Please review the 22 ** following information to ensure the GNU Lesser General Public License 23 ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and 24 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. 25 ** 26 ** As a special exception, The Qt Company gives you certain additional 27 ** rights. These rights are described in The Qt Company LGPL Exception 28 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. 29 ** 30 ** $QT_END_LICENSE$ 31 ** 32 ****************************************************************************/ 33 34 #ifndef AUTOSAVER_H 35 #define AUTOSAVER_H 36 37 #include <QtCore/QObject> 38 #include <QtCore/QBasicTimer> 39 #include <QtCore/QTime> 40 41 /* 42 This class will call the save() slot on the parent object when the parent changes. 43 It will wait several seconds after changed() to combining multiple changes and 44 prevent continuous writing to disk. 45 */ 46 class AutoSaver : public QObject { 47 48 Q_OBJECT 49 50 public: 51 AutoSaver(QObject *parent); 52 ~AutoSaver(); 53 void saveIfNeccessary(); 54 55 public slots: 56 void changeOccurred(); 57 58 protected: 59 void timerEvent(QTimerEvent *event); 60 61 private: 62 QBasicTimer m_timer; 63 QTime m_firstChange; 64 65 }; 66 67 #endif // AUTOSAVER_H 68 69