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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "autosaver.h"
#include <QtCore/QDir>
#include <QtCore/QCoreApplication>
#include <QtCore/QMetaObject>
#include <QtDebug>
#define AUTOSAVE_IN 1000 * 3 // seconds
#define MAXWAIT 1000 * 15 // seconds
AutoSaver::AutoSaver(QObject *parent) : QObject(parent)
{
Q_ASSERT(parent);
}
AutoSaver::~AutoSaver()
{
if (m_timer.isActive())
qWarning() << "AutoSaver: still active when destroyed, changes not saved.";
}
void AutoSaver::changeOccurred()
{
if (m_firstChange.isNull())
m_firstChange.start();
if (m_firstChange.elapsed() > MAXWAIT) {
saveIfNeccessary();
} else {
m_timer.start(AUTOSAVE_IN, this);
}
}
void AutoSaver::timerEvent(QTimerEvent *event)
{
if (event->timerId() == m_timer.timerId()) {
saveIfNeccessary();
} else {
QObject::timerEvent(event);
}
}
void AutoSaver::saveIfNeccessary()
{
if (!m_timer.isActive())
return;
m_timer.stop();
m_firstChange = QTime();
if (!QMetaObject::invokeMethod(parent(), "save", Qt::DirectConnection)) {
qWarning() << "AutoSaver: error invoking slot save() on parent";
}
}
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