rotationsensor.hpp Example File

    /*
     * Copyright (c) 2011, 2012, 2013  BlackBerry Limited.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     * http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */
    #ifndef ROTATIONSENSOR_HPP
    #define ROTATIONSENSOR_HPP

    #include <QObject>
    #include <QtSensors/QRotationSensor>

    QTM_USE_NAMESPACE

    /**
     * The RotationSensor class uses the QRotationSensor class from the QtSensors
     * module to retrieve the current x and y value from the rotation sensor of the device.
     * It calculates the rotation angle and provides it as a property, so that it can be used inside the UI.
     */
    class RotationSensor : public QObject, public QRotationFilter
    {
        Q_OBJECT

        // The property to access the rotation angle
        Q_PROPERTY(qreal rotation READ rotation NOTIFY rotationChanged)

    public:
        RotationSensor(QObject *parent = 0);

        // The accessor methods for the properties
        qreal rotation() const;

    Q_SIGNALS:
        // The change notification signals of the properties
        void rotationChanged();

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

    private:
        // The rotation sensor
        QRotationSensor m_rotationSensor;

        // The rotation property
        qreal m_rotation;
    };

    #endif