BarcodeDecoder.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 BARCODEDECODER_HPP
    #define BARCODEDECODER_HPP

    #include <bb/cascades/Container>
    #include <bb/cascades/CustomControl>
    #include <bb/cascades/multimedia/Camera>
    #include <bb/cascades/multimedia/CameraSettings.hpp>

    #include <zxing/MultiFormatReader.h>

    namespace bb {
    namespace community {
    namespace barcode {

    /**
     * Class tasked with opening camera and reading barcodes.
     */
    class BarcodeDecoderControl: public bb::cascades::CustomControl
    {
        Q_OBJECT

    public:
        BarcodeDecoderControl(bb::cascades::Container *parent = 0);

    public Q_SLOTS:
        /**
         * This method is invoked when the preview frame buffer has some
         * data for it to process.
         */
        void onPreviewFrameAvailable(
                bb::cascades::multimedia::SharedUCharPointer previewBuffer,
                quint64 size, unsigned int width, unsigned int height,
                unsigned int stride);
        /**
         * This method is invoked upon the camera opening.
         */
        void onCameraOpened();

        /**
         * This method clears the barcode data. It is invoked
         * when camera generates the view finder stop signal.
         */
        void onViewfinderStopped();

        /**
         * Invoking this method starts view finder preview.
         */
        void startScanning() const;

        /**
         * Invoking this method stops view finder preview.
         */
        void stopScanning() const;

    Q_SIGNALS:
        /**
         * Signal generated when barcode data has been detected.
         * @param barcode The barcode data value.
         */
        void newBarcodeDetected(QString barcode);

        /**
         * Signal generated when barcode reading is activated.
         */
        void scanningStarted();

        /**
         * Signal generated when barcode reading is stopped.
         */
        void scanningStopped();

    private:
        zxing::Ref<zxing::MultiFormatReader> m_reader;
        QString m_barcodeData;
        bb::cascades::multimedia::Camera* m_camera;
        bb::cascades::multimedia::CameraSettings* m_cameraSettings;
        bool m_landscapePreviewFrames;
        int m_nbuffers;
    };
    }
    }
    }

    #endif