GrueDetector.hpp Example File

    /****************************************************************************
     **
     ** Portions Copyright (C) 2012 Research In Motion Limited.
     ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Research In Motion Ltd. (http://www.rim.com/company/contact/)
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the examples of the BB10 Platform and is derived
     ** from a similar file that is part of the Qt Toolkit.
     **
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Research In Motion, nor the name of Nokia
     **     Corporation and its Subsidiary(-ies), nor the names of its
     **     contributors may be used to endorse or promote products
     **     derived from this software without specific prior written
     **     permission.
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ****************************************************************************/

    #ifndef GRUEDETECTOR_HPP
    #define GRUEDETECTOR_HPP

    #include <QtCore/QObject>
    #include <QtSensors/QLightSensor>

    QTM_USE_NAMESPACE

    class QTimer;

    /**
     * The GrueDetector class uses the QLightSensor class from the QtSensors
     * module to retrieve the current lux value from the light sensor of the device.
     */
    class GrueDetector : public QObject, public QLightFilter
    {
        Q_OBJECT

        // The property to access the chance value of being eaten by a grue
        Q_PROPERTY(int chance READ chance NOTIFY chanceChanged)

    public:
        GrueDetector(QObject *parent = 0);

    Q_SIGNALS:
        // The change notification signal of the chance property
        void chanceChanged();

    protected:
        /**
         * This method is reimplemented from the QLightFilter interface and is
         * called by the QLightSensor whenever new values are available.
         */
        bool filter(QLightReading *reading);

    private Q_SLOTS:
        // This method is called every second if we are in an dark environment
        void increaseChance();

    private:
        // The accessor method for the chance property
        int chance() const;

        // The value of the chance property
        int m_chance;

        // The light sensor
        QLightSensor m_sensor;

        // A timer to calculate the chance
        QTimer *m_darkTimer;
    };

    #endif