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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

QWinNativePanGestureRecognizer::QWinNativePanGestureRecognizer()

{

}

QGesture* QWinNativePanGestureRecognizer::createGesture(QObject *target) const

{

    if (!target)

        return new QPanGesture; // a special case

    if (qobject_cast<QGraphicsObject*>(target))

        return 0;

    if (!target->isWidgetType())

        return 0;

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

    QWidgetPrivate *d = q->d_func();

    d->nativeGesturePanEnabled = true;

    d->winSetupGestures();

    return new QPanGesture;

}

QGestureRecognizer::Result QWinNativePanGestureRecognizer::filterEvent(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::GestureTriggered;

            event->accept();

            break;

        case QNativeGestureEvent::GestureEnd:

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

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

            result = QGestureRecognizer::GestureFinished;

            break;

        default:

            return QGestureRecognizer::Ignore;

        }

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

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

        } else {

            d->lastOffset = d->offset;

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

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

            d->totalOffset += d->offset;

        }

        d->lastPosition = ev->position;

    }

    return result;

}

void QWinNativePanGestureRecognizer::reset(QGesture *state)

{

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

    QPanGesturePrivate *d = pan->d_func();

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

    d->lastPosition = QPoint();

    d->acceleration = 0;

    QGestureRecognizer::reset(state);

}

QT_END_NAMESPACE