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#include "private/qwinnativepangesturerecognizer_win_p.h"

#include "qevent.h"

#include "qgraphicsitem.h"

#include "qgesture.h"

#include "private/qgesture_p.h"

#include "private/qevent_p.h"

#include "private/qapplication_p.h"

#include "private/qwidget_p.h"

QT_BEGIN_NAMESPACE

#if !defined(QT_NO_NATIVE_GESTURES)

QWinNativePanGestureRecognizer::QWinNativePanGestureRecognizer()

{

}

QGesture *QWinNativePanGestureRecognizer::create(QObject *target)

{

    if (!target)

        return new QPanGesture; // a special case

    if (!target->isWidgetType())

        return 0;

    if (qobject_cast<QGraphicsObject *>(target))

        return 0;

    QWidget *q = static_cast<QWidget *>(target);

    QWidgetPrivate *d = q->d_func();

    d->nativeGesturePanEnabled = true;

    d->winSetupGestures();

    return new QPanGesture;

}

QGestureRecognizer::Result QWinNativePanGestureRecognizer::recognize(QGesture *state,

                                                                     QObject *,

                                                                     QEvent *event)

{

    QPanGesture *q = static_cast<QPanGesture*>(state);

    QPanGesturePrivate *d = q->d_func();

    QGestureRecognizer::Result result = QGestureRecognizer::Ignore;

    if (event->type() == QEvent::NativeGesture) {

        QNativeGestureEvent *ev = static_cast<QNativeGestureEvent*>(event);

        switch(ev->gestureType) {

        case QNativeGestureEvent::GestureBegin:

            break;

        case QNativeGestureEvent::Pan:

            result = QGestureRecognizer::TriggerGesture;

            event->accept();

            break;

        case QNativeGestureEvent::GestureEnd:

            if (q->state() == Qt::NoGesture)

                return QGestureRecognizer::Ignore; // some other gesture has ended

            result = QGestureRecognizer::FinishGesture;

            break;

        default:

            return QGestureRecognizer::Ignore;

        }

        if (q->state() == Qt::NoGesture) {

            d->lastOffset = d->offset = QPointF();

            d->startPosition = ev->position;

        } else {

            d->lastOffset = d->offset;

            d->offset = QPointF(ev->position.x() - d->startPosition.x(),

                                ev->position.y() - d->startPosition.y());

        }

    }

    return result;

}

void QWinNativePanGestureRecognizer::reset(QGesture *state)

{

    QPanGesture *pan = static_cast<QPanGesture*>(state);

    QPanGesturePrivate *d = pan->d_func();

    d->lastOffset = d->offset = QPointF();

    d->startPosition = QPoint();

    d->acceleration = 0;

    QGestureRecognizer::reset(state);

}

#endif // QT_NO_NATIVE_GESTURES

QT_END_NAMESPACE