/*

* 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:  Gesture helper implementation

*

*/

#include "updowngesturerecogniser.h"

#include "GenericSimpleGesture.h"

#include "rt_uievent.h"

#include "filelogger.h"

using namespace stmGesture ;

_LIT8(KUpdownName, "Updown") ;

CUpdownGestureRecogniser::CUpdownGestureRecogniser(MGestureListener* aListener) : 

        CGestureRecogniser(aListener)

{

}

CUpdownGestureRecogniser* CUpdownGestureRecogniser::NewL(MGestureListener* aListener)

{

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

    return self;

}

CUpdownGestureRecogniser::~CUpdownGestureRecogniser()

{

}

TGestureRecognitionState CUpdownGestureRecogniser::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 a tap or double tap

    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 check if |x| > |y|

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

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

            {

                if (m_loggingenabled)

                {

                    LOGARG("CUpdownGestureRecogniser: UpDown: num %d code %d", 

                            countOfEvents, eventCode);

                }

                // Is it leftright gesture in our window?

                const TPoint& p = puie->CurrentXY() ;

                TPoint dp = p - puie->PreviousXY() ;

                // check that the Y movement is bigger

                if (Abs(dp.iX) < Abs(dp.iY))

                {

                    state = EGestureActive;

                    stmGesture::TGenericSimpleGesture pgest(KUid, p, dp.iY, puie) ;

                    // Give the gesture a name

                    pgest.setName(KUpdownName) ;

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

                    m_listener->gestureEnter(pgest) ;

                }

            }

        }

    }

    return state;

}

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

{

    m_listener->gestureExit(KUid) ;

}