qzxing/examples/QMLBarcodeScanner/declarative-camera.qml

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import Qt 4.7
import QtMultimediaKit 1.1
import QZXing 1.2

Rectangle {
    id : cameraUI
    color: "black"

    Camera {
        id: camera
        x: 0
        y: 0
        width: parent.width - stillControls.buttonsPanelWidth
        height: parent.height
        focus: visible //to receive focus and capture key events
        captureResolution : "640x480"

        flashMode: stillControls.flashMode
        whiteBalanceMode: stillControls.whiteBalance
//        exposureCompensation: stillControls.exposureCompensation

        onImageCaptured : {
            imageToDecode.source = preview
            decoder.decodeImageQML(imageToDecode);
        }
    }

    Image{
        id: imageToDecode
        visible: false
    }

    CaptureControls {
        id: stillControls
        anchors.fill: parent
        camera: camera
    }

    MessageDialog{
        id:dialog
    }

    QZXing{
        id: decoder
        onTagFound: {
            dialog.text = tag
            dialog.open();
        }
    }
}