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

**

** 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 <QEvent>

#include <QGestureRecognizer>

#include <QGraphicsView>

#include <QMouseEvent>

#include "hbswipegesture.h"

#include "hbswipegesture_p.h"

#include "hbswipegesturelogic_p.h"

/*!

   @hbcore

   \internal

   \class HbSwipeGestureLogic

   \brief

*/

/*!

    \internal

    \brief

    \return

*/

HbSwipeGestureLogic::HbSwipeGestureLogic()

{

    mCurrentTime = QTime();

}

HbSwipeGestureLogic::~HbSwipeGestureLogic() {}

/*!

    \internal

    \brief

    \return

*/

bool HbSwipeGestureLogic::isMouseEvent(QEvent::Type eventType)

{

    return eventType == QEvent::MouseButtonPress ||

           eventType == QEvent::MouseMove ||

           eventType == QEvent::MouseButtonDblClick ||

           eventType == QEvent::MouseButtonRelease;

}

/*!

    \internal

    \brief

    \return

*/

void HbSwipeGestureLogic::resetGesture(HbSwipeGesture *gesture)

{   

    gesture->setSwipeAngle(0);

    gesture->setSceneSwipeAngle(0);

    gesture->d_func()->mStartPos = QPointF();

    gesture->d_func()->mSceneStartPos = QPointF();    

}

/*!

    \internal

    \brief

    \return

*/

QGestureRecognizer::Result HbSwipeGestureLogic::handleMousePress(

        Qt::GestureState gestureState,

        HbSwipeGesture *gesture,

        QObject *watched,

        QMouseEvent *me )

{

    // Just ignore situations that are not interesting at all.

    if (!(gestureState == Qt::NoGesture && me->button() == Qt::LeftButton)) {

        return QGestureRecognizer::Ignore;

    }

    gesture->d_func()->mStartTime = QTime::currentTime();  

    gesture->d_func()->mStartPos = me->globalPos();

    gesture->d_func()->mSceneStartPos = HbGestureUtils::mapToScene(watched, me->globalPos());

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

    return QGestureRecognizer::MayBeGesture;

}

/*!

    \internal

    \brief

    \return

*/

QGestureRecognizer::Result HbSwipeGestureLogic::handleMouseRelease(

        Qt::GestureState gestureState,

        HbSwipeGesture *gesture,

        QObject *watched,

        QMouseEvent *me )

{   

    Q_UNUSED(gesture);

    Q_UNUSED(watched);

    Q_UNUSED(gestureState);

    QPointF totalOffset = me->globalPos() - gesture->d_func()->mStartPos.toPoint();

    QPointF velocity = totalOffset / gesture->d_func()->mStartTime.elapsed();

    gesture->setSwipeAngle(QLineF(gesture->d_func()->mStartPos, me->globalPos()).angle());

    gesture->setSceneSwipeAngle(QLineF(gesture->d_func()->mSceneStartPos, HbGestureUtils::mapToScene(watched, me->globalPos())).angle());

    if (totalOffset.manhattanLength() >= HbSwipeMinOffset && velocity.manhattanLength() >= HbSwipeMinSpeed && me->button() == Qt::LeftButton) {

        return QGestureRecognizer::FinishGesture;

    } else {

        return QGestureRecognizer::Ignore;

    }

}

/*!

    \internal

    \brief

    \return

*/

QGestureRecognizer::Result HbSwipeGestureLogic::recognize(

        Qt::GestureState gestureState,

        HbSwipeGesture *gesture,

        QObject *watched,

        QEvent *event )

{

    // Record the time right away.

    mCurrentTime = QTime::currentTime();

    if ( isMouseEvent(event->type()) )

    {

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

        switch(event->type())

        {

        case QEvent::MouseButtonDblClick:

        case QEvent::MouseButtonPress:

            return handleMousePress(gestureState, gesture, watched, me);

        case QEvent::MouseMove:

            if (me->buttons().testFlag(Qt::LeftButton))

                return QGestureRecognizer::MayBeGesture;

            else

                return QGestureRecognizer::Ignore;

        case QEvent::MouseButtonRelease:

            return handleMouseRelease(gestureState, gesture, watched, me);

        default: break;

        }

    }

    return QGestureRecognizer::Ignore;

}