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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the E-Bike demo project.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later 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 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef FPSCOUNTER_H
+#define FPSCOUNTER_H
+
+#include <QObject>
+#include <QElapsedTimer>
+
+class QQuickWindow;
+
+class FpsCounter : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(qreal fps READ fps NOTIFY fpsChanged)
+    Q_PROPERTY(bool visible READ visible WRITE setVisible NOTIFY visibleChanged)
+
+public:
+    explicit FpsCounter(QObject *parent = nullptr);
+
+public:
+    qreal fps() const { return m_fps; }
+    bool visible() const { return m_visible; }
+    void setVisible(bool visible);
+    void setWindow(QQuickWindow *window);
+
+protected:
+    void timerEvent(QTimerEvent *);
+
+signals:
+    void fpsChanged(qreal fps);
+    void visibleChanged(bool visible);
+
+private slots:
+    void frameUpdated() { m_frameCounter++; }
+
+private:
+    QElapsedTimer m_timer;
+    int m_frameCounter;
+    qreal m_fps;
+    bool m_visible;
+};
+
+#endif // FPSCOUNTER_H