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** This file is part of the QtSensors module of the Qt Toolkit.
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#include "winrtorientationsensor.h"
#include "winrtcommon.h"

#include <QtSensors/QOrientationSensor>

#include <functional>
#include <wrl.h>
#include <windows.devices.sensors.h>
using namespace Microsoft::WRL;
using namespace Microsoft::WRL::Wrappers;
using namespace ABI::Windows::Foundation;
using namespace ABI::Windows::Devices::Sensors;

typedef ITypedEventHandler<SimpleOrientationSensor *, SimpleOrientationSensorOrientationChangedEventArgs *> SimpleOrientationReadingHandler;

QT_USE_NAMESPACE

class WinRtOrientationSensorPrivate
{
public:
    WinRtOrientationSensorPrivate(WinRtOrientationSensor *p) : q(p)
    {
        token.value = 0;
    }

    QOrientationReading reading;

    ComPtr<ISimpleOrientationSensor> sensor;
    EventRegistrationToken token;

    HRESULT readingChanged(ISimpleOrientationSensor *,
                           ISimpleOrientationSensorOrientationChangedEventArgs *args)
    {
        SimpleOrientation value;
        HRESULT hr = args->get_Orientation(&value);
        if (FAILED(hr)) {
            qCWarning(lcWinRtSensors) << "Failed to get orientation value." << qt_error_string(hr);
            return hr;
        }

        DateTime dateTime;
        hr = args->get_Timestamp(&dateTime);
        if (FAILED(hr)) {
            qCWarning(lcWinRtSensors) << "Failed to get compass reading timestamp." << qt_error_string(hr);
            return hr;
        }

        switch (value) {
        default:
            reading.setOrientation(QOrientationReading::Undefined);
            break;
        case SimpleOrientation_NotRotated:
            reading.setOrientation(QOrientationReading::TopUp);
            break;
        case SimpleOrientation_Rotated90DegreesCounterclockwise:
            reading.setOrientation(QOrientationReading::RightUp);
            break;
        case SimpleOrientation_Rotated180DegreesCounterclockwise:
            reading.setOrientation(QOrientationReading::TopDown);
            break;
        case SimpleOrientation_Rotated270DegreesCounterclockwise:
            reading.setOrientation(QOrientationReading::LeftUp);
            break;
        case SimpleOrientation_Faceup:
            reading.setOrientation(QOrientationReading::FaceUp);
            break;
        case SimpleOrientation_Facedown:
            reading.setOrientation(QOrientationReading::FaceDown);
            break;
        }

        reading.setTimestamp(dateTimeToMsSinceEpoch(dateTime));
        q->newReadingAvailable();
        return S_OK;
    }

private:
    WinRtOrientationSensor *q;
};

WinRtOrientationSensor::WinRtOrientationSensor(QSensor *sensor)
    : QSensorBackend(sensor), d_ptr(new WinRtOrientationSensorPrivate(this))
{
    Q_D(WinRtOrientationSensor);
    HStringReference classId(RuntimeClass_Windows_Devices_Sensors_SimpleOrientationSensor);
    ComPtr<ISimpleOrientationSensorStatics> factory;
    HRESULT hr = RoGetActivationFactory(classId.Get(), IID_PPV_ARGS(&factory));
    if (FAILED(hr)) {
        qCWarning(lcWinRtSensors) << "Unable to initialize orientation sensor factory."
                                      << qt_error_string(hr);
        sensorError(hr);
        return;
    }
    hr = factory->GetDefault(&d->sensor);
    if (FAILED(hr)) {
        qCWarning(lcWinRtSensors) << "Unable to get default orientation sensor."
                                      << qt_error_string(hr);
        sensorError(hr);
        return;
    }
    if (!d->sensor) {
        qCWarning(lcWinRtSensors) << "Default orientationsensor was not found on the system.";
        return;
    }

    setReading<QOrientationReading>(&d->reading);
}

WinRtOrientationSensor::~WinRtOrientationSensor()
{
}

void WinRtOrientationSensor::start()
{
    Q_D(WinRtOrientationSensor);
    if (!d->sensor)
        return;
    if (d->token.value)
        return;

    ComPtr<SimpleOrientationReadingHandler> callback =
            Callback<SimpleOrientationReadingHandler>(d, &WinRtOrientationSensorPrivate::readingChanged);
    HRESULT hr = d->sensor->add_OrientationChanged(callback.Get(), &d->token);

    if (FAILED(hr)) {
        qCWarning(lcWinRtSensors) << "Unable to attach to reading changed event."
                                  << qt_error_string(hr);
        sensorError(hr);
        return;
    }
}

void WinRtOrientationSensor::stop()
{
    Q_D(WinRtOrientationSensor);
    if (!d->sensor)
        return;
    if (!d->token.value)
        return;

    HRESULT hr = d->sensor->remove_OrientationChanged(d->token);
    if (FAILED(hr)) {
        qCWarning(lcWinRtSensors) << "Unable to detach from reading changed event."
                                  << qt_error_string(hr);
        sensorError(hr);
        return;
    }

    d->token.value = 0;
}
