1 files changed, 90 insertions, 0 deletions
diff --git a/src/autosaver.cpp b/src/autosaver.cpp
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+++ b/src/autosaver.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** Commercial Usage
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License versions 2.0 or 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 GNU General Public Licensing requirements will be met:
+** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
+** http://www.gnu.org/copyleft/gpl.html.  In addition, as a special
+** exception, Nokia gives you certain additional rights. These rights
+** are described in the Nokia Qt GPL Exception version 1.3, included in
+** the file GPL_EXCEPTION.txt in this package.
+**
+** Qt for Windows(R) Licensees
+** As a special exception, Nokia, as the sole copyright holder for Qt
+** Designer, grants users of the Qt/Eclipse Integration plug-in the
+** right for the Qt/Eclipse Integration to link to functionality
+** provided by Qt Designer and its related libraries.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+**
+****************************************************************************/
+
+#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";
+    }
+}
+