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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(QSizeF(lastPos.x(), lastPos.y()));
            g->setTotalOffset(g->totalOffset() + QSizeF(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(QSizeF());
    g->setLastOffset(QSizeF());
    g->setOffset(QSizeF());
    g->setAcceleration(0);
    g->setProperty("lastPos", QVariant());
    g->setProperty("pressed", QVariant::fromValue<bool>(false));
    QGestureRecognizer::reset(state);
}