--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/demos/browser/autosaver.d	Sun May 17 18:49:59 2009 +0000
@@ -0,0 +1,114 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 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 qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+module autosaver;
+
+import QtCore.QObject;
+import QtCore.QBasicTimer;
+import QtCore.QTime;
+
+import QtCore.QDir;
+import QtCore.QCoreApplication;
+import QtCore.QMetaObject;
+import QtDebug;
+
+const uint AUTOSAVE_IN  = 1000 * 3  // seconds
+const uint MAXWAIT = 1000 * 15 // seconds
+
+/*
+    This class will call the save() slot on the parent object when the parent changes.
+    It will wait several seconds after changed() to combining multiple changes and
+    prevent continuous writing to disk.
+  */
+class AutoSaver : public QObject {
+
+Q_OBJECT
+
+public:
+    this(QObject *parent)
+{
+	super(parent);
+    Q_ASSERT(parent);
+}
+    ~this();
+{
+    if (m_timer.isActive())
+        qWarning() << "AutoSaver: still active when destroyed, changes not saved.";
+}
+    void 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";
+    }
+}
+
+public slots:
+    void changeOccurred();
+{
+    if (m_firstChange.isNull())
+        m_firstChange.start();
+
+    if (m_firstChange.elapsed() > MAXWAIT) {
+        saveIfNeccessary();
+    } else {
+        m_timer.start(AUTOSAVE_IN, this);
+    }
+}
+
+protected:
+    void timerEvent(QTimerEvent *event)
+{
+    if (event.timerId() == m_timer.timerId()) {
+        saveIfNeccessary();
+    } else {
+        QObject::timerEvent(event);
+    }
+}
+
+
+private:
+    QBasicTimer m_timer;
+    QTime m_firstChange;
+}
+