/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the demonstration applications of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include "autosaver.h"+
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+
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#include <QtCore/QDir>+
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#include <QtCore/QCoreApplication>+
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#include <QtCore/QMetaObject>+
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#include <QtDebug>+
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+
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#define AUTOSAVE_IN  1000 * 3  // seconds+
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#define MAXWAIT      1000 * 15 // seconds+
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+
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AutoSaver::AutoSaver(QObject *parent) : QObject(parent)+
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{+
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    Q_ASSERT(parent);+
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}+
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+
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AutoSaver::~AutoSaver()+
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{+
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    if (m_timer.isActive())+
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        qWarning() << "AutoSaver: still active when destroyed, changes not saved.";+
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}+
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+
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void AutoSaver::changeOccurred()+
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{+
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    if (m_firstChange.isNull())+
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        m_firstChange.start();+
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+
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    if (m_firstChange.elapsed() > MAXWAIT) {+
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        saveIfNeccessary();+
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    } else {+
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        m_timer.start(AUTOSAVE_IN, this);+
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    }+
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}+
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+
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void AutoSaver::timerEvent(QTimerEvent *event)+
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{+
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    if (event->timerId() == m_timer.timerId()) {+
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        saveIfNeccessary();+
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    } else {+
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        QObject::timerEvent(event);+
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    }+
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}+
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+
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void AutoSaver::saveIfNeccessary()+
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{+
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    if (!m_timer.isActive())+
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        return;+
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    m_timer.stop();+
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    m_firstChange = QTime();+
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    if (!QMetaObject::invokeMethod(parent(), "save", Qt::DirectConnection)) {+
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        qWarning() << "AutoSaver: error invoking slot save() on parent";+
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    }+
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}+
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+
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