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#include "mousepangesturerecognizer.h"

#include <QEvent>

#include <QMouseEvent>

#include <QGesture>

MousePanGestureRecognizer::MousePanGestureRecognizer()

{

}

QGesture* MousePanGestureRecognizer::createGesture(QObject *) const

{

    return new QPanGesture;

}

QGestureRecognizer::Result MousePanGestureRecognizer::filterEvent(QGesture *state, QObject *, QEvent *event)

{

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

    QMouseEvent *me = static_cast<QMouseEvent *>(event);

    if (event->type() == QEvent::MouseButtonPress || event->type() == QEvent::MouseButtonDblClick) {

        g->setHotSpot(me->globalPos());

        g->setProperty("lastPos", me->globalPos());

        g->setProperty("pressed", QVariant::fromValue<bool>(true));

        return QGestureRecognizer::GestureTriggered | QGestureRecognizer::ConsumeEventHint;

    } else if (event->type() == QEvent::MouseMove) {

        if (g->property("pressed").toBool()) {

            QPoint pos = me->globalPos();

            QPoint lastPos = g->property("lastPos").toPoint();

            g->setLastOffset(g->offset());

            lastPos = pos - lastPos;

            g->setOffset(QPointF(lastPos.x(), lastPos.y()));

            g->setTotalOffset(g->totalOffset() + QPointF(lastPos.x(), lastPos.y()));

            g->setProperty("lastPos", pos);

            return QGestureRecognizer::GestureTriggered | QGestureRecognizer::ConsumeEventHint;

        }

        return QGestureRecognizer::NotGesture;

    } else if (event->type() == QEvent::MouseButtonRelease) {

        return QGestureRecognizer::GestureFinished | QGestureRecognizer::ConsumeEventHint;

    }

    return QGestureRecognizer::Ignore;

}

void MousePanGestureRecognizer::reset(QGesture *state)

{

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

    g->setTotalOffset(QPointF());

    g->setLastOffset(QPointF());

    g->setOffset(QPointF());

    g->setAcceleration(0);

    g->setProperty("lastPos", QVariant());

    g->setProperty("pressed", QVariant::fromValue<bool>(false));

    QGestureRecognizer::reset(state);

}