/*

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

* All rights reserved.

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU Lesser General Public License as published by

* the Free Software Foundation, version 2.1 of the License.

* 

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

* GNU Lesser General Public License for more details.

*

* You should have received a copy of the GNU Lesser General Public License

* along with this program.  If not, 

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

*

* Description:

*

*/

#include "qstmedgescrollgesturerecogniser.h"

#include "qstmgenericsimplegesture.h"

#include "qstmuievent_if.h"

#include "qstmfilelogger.h"

using namespace qstmGesture ;

QStm_EdgeScrollGestureRecogniser::QStm_EdgeScrollGestureRecogniser(QStm_GestureListenerIf* listener) :

                                   QStm_GestureRecogniser(listener),

                                   m_listener(listener) , m_area()

{

    m_powner = listener->getOwner() ;

    m_gestureEnabled = true ;

    m_rangesizeInPixels = 10 ;  // by default 10 pixels from the edges is the area

}

QStm_EdgeScrollGestureRecogniser::~QStm_EdgeScrollGestureRecogniser()

{

}

QStm_GestureRecognitionState QStm_EdgeScrollGestureRecogniser::recognise(int numOfActiveStreams,

                                                                      QStm_GestureEngineIf* pge)

{

    QStm_GestureRecognitionState state = m_state = ENotMyGesture;

    // Check if we are enabled or not

    if (!m_gestureEnabled) return state ;

    // Look at the events to see if it looks like edge scroll with one pointer

    if (numOfActiveStreams == 1) {

        // Then look at the event stream, it has to be EHold

        const qstmUiEventEngine::QStm_UiEventIf* puie = pge->getUiEvents(0);

        int countOfEvents = puie->countOfEvents();

        qstmUiEventEngine::QStm_UiEventCode eventCode = puie->code();

        if (m_loggingenabled) {

            LOGARG("QStm_EdgeScrollGestureRecogniser: %d num %d code %d", eventCode, countOfEvents, eventCode);

        }

        if (eventCode == qstmUiEventEngine::EHold) { // The last one is EHold, look if it is near the area defined

            const QPoint& p = puie->currentXY();

            if (m_loggingenabled) {

                LOGARG("QStm_EdgeScrollGestureRecogniser: 0x%x EHold: num %d code %d, %d", 

                		this, countOfEvents, p.x(), p.y());

                LOGARG("QStm_EdgeScrollGestureRecogniser: area, %d,%d %d,%d, range: %d", 

                		m_area.x(), m_area.y(), m_area.x() + m_area.width(), m_area.y() + m_area.height(), 

                		m_rangesizeInPixels);

            }

            // check where the point is inside the area defined but outside of the area shrunk by m_rangesizeInPixels.

            QRect rcInner(QPoint(0,0), m_area.size() - QSize(m_rangesizeInPixels, m_rangesizeInPixels));

            rcInner.moveCenter(m_area.center()) ;

            if (m_area.contains(p) && !rcInner.contains(p))

            {

                if (m_loggingenabled) {

                    LOGARG("QStm_EdgeScrollGestureRecogniser: HIT, (%d,%d) in %d,%d %d,%d, range: %d", 

                    		p.x(), p.y(), m_area.x(), m_area.y(), 

                    		m_area.x() + m_area.width(), m_area.y() + m_area.height(),

                    		m_rangesizeInPixels);

                }

                state = EGestureActive ;

                // this is edge scroll, check where it is about...

                QStm_EdgeScroll scrolltype = EEdgeScrollUnknown ;

                if (p.y() < m_area.y() + m_rangesizeInPixels)

                    scrolltype = EEdgeScrollUp ;   // if Y is small enough, it is always up

                else if (p.y() > m_area.y() + m_area.height() - m_rangesizeInPixels)

                    scrolltype = EEdgeScrollDown ; // if Y is big enough, it is always down

                else if (p.x() < m_area.x() + m_rangesizeInPixels)

                    scrolltype = EEdgeScrollLeft ; // if X is small enough, it is always left

                else  if (p.x() > m_area.x() + m_area.width() - m_rangesizeInPixels)

                    scrolltype = EEdgeScrollRight ;   // if X is big enough, it is always right

                // issue the edge scroll gesture

                pgest.setTarget(puie->target());

                // Call the listener to inform that a Tap has occurred...

                m_listener->gestureEnter(pgest) ;

            }

        }

    }

    m_state = state;

    return state;

}

void QStm_EdgeScrollGestureRecogniser::release(QStm_GestureEngineIf* /*ge*/)

{

    if (m_loggingenabled) {

        LOGARG("QStm_EdgeScrollGestureRecogniser: 0x%x release", this);

    }

    m_state = m_state = ENotMyGesture;

}

void QStm_EdgeScrollGestureRecogniser::enableLogging(bool loggingOn)

{

    m_loggingenabled = loggingOn;

}

void QStm_EdgeScrollGestureRecogniser::enable(bool enabled)

{

    m_gestureEnabled = enabled ;

}

bool QStm_EdgeScrollGestureRecogniser::isEnabled()

{

    return m_gestureEnabled ;

}

void QStm_EdgeScrollGestureRecogniser::setOwner(void* owner)

{

    m_powner = owner;

}

void QStm_EdgeScrollGestureRecogniser::setScrollRange(int rangeInPixels)

{

    m_rangesizeInPixels = rangeInPixels ;

}

void QStm_EdgeScrollGestureRecogniser::setArea(const QRect& theArea)

{

    m_area = theArea ;

    if (m_loggingenabled)

    {

        LOGARG("QStm_EdgeScrollGestureRecogniser: set area, %d,%d %d,%d", 

        		m_area.x(), m_area.y(), m_area.x() + m_area.width(), m_area.y() + m_area.height());

    }

}