TrackManager.hpp Example File

    /* Copyright (c) 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 TRACKMANAGER_HPP
    #define TRACKMANAGER_HPP

    #include <bb/cascades/GroupDataModel>
    #include <QtCore/QObject>

    /**
     * @short A utility class to manage the recorded tracks.
     *
     * The TrackManager class provides information about the already
     * recorded tracks and about the name of the next track to record.
     */
    class TrackManager : public QObject
    {
        Q_OBJECT

        // A model that contains a list of all recorded tracks
        Q_PROPERTY(bb::cascades::GroupDataModel* model READ model CONSTANT)

        // A flag that defines whether recorded tracks are available or not
        Q_PROPERTY(bool hasRecordedTracks READ hasRecordedTracks NOTIFY hasRecordedTracksChanged)

    public:
        TrackManager(QObject *parent = 0);

        // This method is invoked to get the target URL for the next track to record.
        Q_INVOKABLE QUrl nextTrackUrl() const;

    public Q_SLOTS:
        // This method is invoked to clear all recorded tracks
        void clearAllTracks();

        // This method is invoked to update the internal state of the track manager.
        void update();

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

    private:
        // A helper method to update internal data from the track storage location
        void updateTrackInformation();

        // The accessor methods of the properties
        bb::cascades::GroupDataModel* model() const;
        bool hasRecordedTracks() const;

        // The model that contains the list of recorded tracks
        bb::cascades::GroupDataModel *m_model;

        // The internal track counter
        unsigned int m_trackCounter;
    };

    #endif