/*

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

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:   

*

*/

#include "hoveringgesturerecogniser.h"

#include "GenericSimpleGesture.h"

#include "rt_uievent.h"

#include "filelogger.h"

using namespace stmGesture ;

extern long Mm2Pixels(long mm) ;

CHoveringGestureRecogniser::CHoveringGestureRecogniser(MGestureListener* aListener) :

    CGestureRecogniser(aListener)

{

    m_hovering = false ;

    m_hoveringspeed = 0.9f ;

}

CHoveringGestureRecogniser* CHoveringGestureRecogniser::NewL(MGestureListener* aListener)

{

    CHoveringGestureRecogniser* self = new (ELeave) CHoveringGestureRecogniser(aListener) ;

    return self;

}

CHoveringGestureRecogniser::~CHoveringGestureRecogniser()

{

}

TGestureRecognitionState CHoveringGestureRecogniser::recognise(int numOfActiveStreams,

        MGestureEngineIf* pge)

{

    TGestureRecognitionState state = ENotMyGesture;

    // Check if we are enabled or not

    if (!m_gestureEnabled) return state ;

    // Look at the events to see if it looks like hovering

    if (numOfActiveStreams == 1)

    {

        // Then look at the event stream, it has to be tap and release

        const stmUiEventEngine::MUiEvent* puie = pge->getUiEvents(0);

        int countOfEvents = puie->countOfEvents() ;

        stmUiEventEngine::TUiEventCode eventCode = puie->Code() ;

        if (countOfEvents > 1) // do we have more than one event in the stream?

        {

            // Then look at the events to see if they are suitable for us

            // should we check that all of the events are targeted to our window?

            // currently we only check if the last one is for us and is EMove, then we pan...

            if (puie->Target() == m_powner &&

                    eventCode == stmUiEventEngine::EMove) // The last one is move in our window

            {

                float speedX = puie->speedX() ;

                float speedY = puie->speedY() ;

                if (m_loggingenabled)

                {

                    LOGARG("CHoveringGestureRecogniser: %d: num %d code %d, speed %f, limit %f",

                        m_hovering, countOfEvents, eventCode, 

                        double(speedX), double(m_hoveringspeed));

                }

                // It might be hovering gesture in our window, handle it

                if (!m_hovering)

                {

                    // we are not yet hovering, so lets see if it is slow movement

                    // but it must be movement; if it is 0.0 do not hover

                    if ( ((speedX > 0.01f) ||(speedY > 0.01f)) && 

                            ((speedX < m_hoveringspeed) || (speedY < m_hoveringspeed))

                        )

                    {

                        state = EGestureActive;

                        m_hovering = true;

                    }

                }

                if (m_hovering)

                {

                    // after we've started hovering, the speed could be increased a little before we loose hovering

                    // but this adjustment is not implemented now...

                    if (speedX < m_hoveringspeed || speedY < m_hoveringspeed)

                    {

                        using stmUiEventEngine::TUiEventSpeed;

                        state = EGestureActive;

                        TUiEventSpeed speedIf(speedX, speedY);

                        stmGesture::TDirectionalGesture pgest(

                                        KUid,

                                        puie->CurrentXY(),

                                        puie->PreviousXY(),

                                        &speedIf,

                                        m_loggingenabled);

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

                        m_listener->gestureEnter(pgest);

                    }

                }

            }

            else if (m_hovering)

            {

                if (eventCode == stmUiEventEngine::ERelease) // The last one is release in any window

                {

                    m_hovering = false ;

                    // release will handle informing of the listener

                }

            }

        }

        else

        {

            // count of events == 1, lets see if it is EMove, then we take it and start hovering

            if (puie->Target() == m_powner &&

                    eventCode == stmUiEventEngine::EMove) // The only one is move in our window

            {

                if (m_loggingenabled)

                {

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

                }

                state = EGestureActive;

                stmGesture::TDirectionalGesture pgest(

                                        KUid,

                                        puie->CurrentXY(),

                                        puie->PreviousXY(),

                                        puie,

                                        m_loggingenabled);

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

                m_listener->gestureEnter(pgest);

            }

        }

    }

    if (state == ENotMyGesture)

    {

        // if it was not our gesture, then the state can not be hovering...

        m_hovering = false ;

    }

    return state;

}

void CHoveringGestureRecogniser::release(MGestureEngineIf* /*ge*/)

{

    m_hovering = false ;

    m_listener->gestureExit(KUid) ;

}

void CHoveringGestureRecogniser::setHoveringSpeed(float aSpeed) __SOFTFP

{

    m_hoveringspeed = aSpeed ;

}