/****************************************************************************

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbCore module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** This file may be used under the terms of the GNU Lesser General Public

** License version 2.1 as published by the Free Software Foundation and

** appearing in the file LICENSE.LGPL included in the packaging of this file.

** Please review the following information to ensure the GNU Lesser General

** Public License version 2.1 requirements will be met:

** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at developer.feedback@nokia.com.

**

****************************************************************************/

#include "hbmousepangesturerecognizer_p.h"

#include <QEvent>

#include <QGraphicsSceneMouseEvent>

#include <QGesture>

#include <QVariant>

HbMousePanGestureRecognizer::HbMousePanGestureRecognizer()

{

}

HbMousePanGestureRecognizer::~HbMousePanGestureRecognizer()

{

}

QGesture* HbMousePanGestureRecognizer::create(QObject *)

{

    return new QPanGesture;

}

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

{

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

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

    QPoint pos;

    switch(event->type()) {

    case QEvent::GraphicsSceneMousePress:

        g->setOffset(QPointF(0,0));

        g->setProperty("startPos", me->screenPos());

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

    case QEvent::GraphicsSceneMouseMove:

    case QEvent::GraphicsSceneMouseRelease:

        pos = me->screenPos();

        g->setHotSpot(pos);

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

        break;

    default:

        return QGestureRecognizer::Ignore;

    }

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

        return QGestureRecognizer::MayBeGesture;

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

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

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

            g->setOffset(offset);

            return QGestureRecognizer::TriggerGesture;

        }

        return QGestureRecognizer::CancelGesture;

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

        if(g->state() >= Qt::GestureStarted) {

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

            g->setOffset(offset);

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

            return QGestureRecognizer::FinishGesture;

        } else {

            return QGestureRecognizer::CancelGesture;

        }

    }

    return QGestureRecognizer::Ignore;

}

void HbMousePanGestureRecognizer::reset(QGesture *state)

{

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

    g->setLastOffset(QPointF());

    g->setOffset(QPointF(0,0));

    g->setAcceleration(0);

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

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

    QGestureRecognizer::reset(state);

}