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#include "mousepangesturerecognizer.h"

#include <QEvent>

#include <QVariant>

#include <QGraphicsSceneMouseEvent>

#include <QMouseEvent>

#include <QGesture>

MousePanGestureRecognizer::MousePanGestureRecognizer()

{

}

QGesture* MousePanGestureRecognizer::create(QObject *)

{

    return new QPanGesture;

}

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

{

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

    QPoint globalPos;

    switch (event->type()) {

    case QEvent::GraphicsSceneMousePress:

    case QEvent::GraphicsSceneMouseDoubleClick:

    case QEvent::GraphicsSceneMouseMove:

    case QEvent::GraphicsSceneMouseRelease:

        globalPos = static_cast<QGraphicsSceneMouseEvent *>(event)->screenPos();

        break;

    case QEvent::MouseButtonPress:

    case QEvent::MouseMove:

    case QEvent::MouseButtonRelease:

        globalPos = static_cast<QMouseEvent *>(event)->globalPos();

        break;

    default:

        break;

    }

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

        || event->type() == QEvent::GraphicsSceneMousePress || event->type() == QEvent::GraphicsSceneMouseDoubleClick) {

        g->setHotSpot(globalPos);

        g->setProperty("startPos", globalPos);

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

        return QGestureRecognizer::TriggerGesture | QGestureRecognizer::ConsumeEventHint;

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

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

            QPoint offset = globalPos - g->property("startPos").toPoint();

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

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

            return QGestureRecognizer::TriggerGesture | QGestureRecognizer::ConsumeEventHint;

        }

        return QGestureRecognizer::CancelGesture;

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

        return QGestureRecognizer::FinishGesture | QGestureRecognizer::ConsumeEventHint;

    }

    return QGestureRecognizer::Ignore;

}

void MousePanGestureRecognizer::reset(QGesture *state)

{

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

    g->setLastOffset(QPointF());

    g->setOffset(QPointF());

    g->setAcceleration(0);

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

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

    QGestureRecognizer::reset(state);

}