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Diffstat (limited to 'examples/gestures/browser/autosaver.cpp')
-rw-r--r-- | examples/gestures/browser/autosaver.cpp | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/examples/gestures/browser/autosaver.cpp b/examples/gestures/browser/autosaver.cpp new file mode 100644 index 0000000..77888ce --- /dev/null +++ b/examples/gestures/browser/autosaver.cpp @@ -0,0 +1,94 @@ +/**************************************************************************** +** +** 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"; + } +} + |