/*

* 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 "qstmhoveringgesturerecogniser.h"

#include "qstmgenericsimplegesture.h"

#include "qstmuievent_if.h"

#include "qstmfilelogger.h"

using namespace qstmGesture ;

QStm_HoveringGestureRecogniser::QStm_HoveringGestureRecogniser(QStm_GestureListenerIf* listener) :

                                QStm_GestureRecogniser(listener)

{

    m_hovering = false ;

    m_hoveringspeed = 0.9f ;

}

QStm_HoveringGestureRecogniser::~QStm_HoveringGestureRecogniser()

{

}

QStm_GestureRecognitionState QStm_HoveringGestureRecogniser::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 hovering

    if (numOfActiveStreams == 1)  {

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

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

        int countOfEvents = puie->countOfEvents() ;

        qstmUiEventEngine::QStm_UiEventCode 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 == qstmUiEventEngine::EMove) {// The last one is move in our window

                float speed = puie->speed() ;

                if (m_loggingenabled) {

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

                            m_hovering, countOfEvents, eventCode, double(speed), 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 (speed > 0.01f && speed < 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 (speed < m_hoveringspeed) {

                        using qstmUiEventEngine::QStm_UiEventSpeed;

                        state = EGestureActive;

                        QStm_UiEventSpeed speedIf(speed);

                        qstmGesture::QStm_DirectionalGesture pgest(

                                        KUid,

                                        puie->currentXY(),

                                        puie->previousXY(),

                                        &speedIf,

                                        m_loggingenabled);

                        pgest.setTarget(puie->target());                        // Call the listener to inform that a Hover has occurred...

                        m_listener->gestureEnter(pgest);

                    }

                }

            }

            else if (m_hovering) {

                if (eventCode == qstmUiEventEngine::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 == qstmUiEventEngine::EMove) {// The only one is move in our window

                if (m_loggingenabled) {

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

                }

                state = EGestureActive;

                qstmGesture::QStm_DirectionalGesture pgest(

                                        KUid,

                                        puie->currentXY(),

                                        puie->previousXY(),

                                        puie,

                                        m_loggingenabled);

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

                // 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 ;

    }

    m_state = state;

    return state;

}

void QStm_HoveringGestureRecogniser::release(QStm_GestureEngineIf* pge)

{

    m_hovering = false ;

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

    using qstmUiEventEngine::QStm_UiEventSpeed;

    qstmGesture::QStm_DirectionalGesture pgest(

                    KUid,

                    puie->currentXY(),

                    puie->previousXY(),

                    puie,

                    m_loggingenabled);

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

    m_listener->gestureExit(pgest) ;

    m_state = ENotMyGesture;

}

void QStm_HoveringGestureRecogniser::setHoveringSpeed(float aSpeed) /*__SOFTFP */

{

    m_hoveringspeed = aSpeed ;

}