webengine/webkitutils/stmgesturefw/src/zoomgesturerecogniser.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 00:56:45 +0200
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/*
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* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Gesture helper implementation
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*
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*/
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#include <e32math.h>
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#include <rt_uievent.h>
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#include "filelogger.h"
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#include "zoomgesturerecogniser.h"
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#include "GenericSimpleGesture.h"
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using namespace stmGesture ;
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_LIT8(KZoomInName, "ZoomIn") ;
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_LIT8(KZoomOutName, "ZoomOut") ;
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CZoomGestureRecogniser* CZoomGestureRecogniser::NewL(MGestureListener* aListener)
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{
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    CZoomGestureRecogniser* self = new (ELeave) CZoomGestureRecogniser(aListener) ;
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    return self;
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}
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CZoomGestureRecogniser::CZoomGestureRecogniser(MGestureListener* aListener) :
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    CGestureRecogniser(aListener), m_area(TRect::EUninitialized)
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{
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    m_rangesizeInPixels = 20 ;  // by default 20 pixels from the edges is the area
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    m_zooming = false ;
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}
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CZoomGestureRecogniser::~CZoomGestureRecogniser()
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{
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}
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TGestureRecognitionState CZoomGestureRecogniser::recognise(int numOfActiveStreams,
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        MGestureEngineIf* pge)
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{
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    TGestureRecognitionState state = ENotMyGesture;
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    // Check if we are enabled or not
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    if (!m_gestureEnabled) return state ;
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    // Look at the events to see if it looks like zoom with one pointer
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    if (numOfActiveStreams == 1)
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    {
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        const stmUiEventEngine::MUiEvent* puie = pge->getUiEvents(0);
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        int countOfEvents = puie->countOfEvents();
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        stmUiEventEngine::TUiEventCode eventCode = puie->Code();
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        if (m_loggingenabled)
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        {
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            LOGARG("CZoomGestureRecogniser: %d num %d code %d",
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                    eventCode, countOfEvents, eventCode);
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        }
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        if (!m_zooming)
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        {
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            // We are not yet zoomin, check if we should start, i.e. whether we are
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            // inside the zoom trigger areas near the corners when touch is done...
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            if (eventCode == stmUiEventEngine::ETouch) // It must be ETouch inside the corner
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            {
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                if (m_loggingenabled)
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                {
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                    LOGARG("CZoomGestureRecogniser: 0x%x ETouch: num %d code %d, %d",
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                            this, countOfEvents, puie->CurrentXY().iX, puie->CurrentXY().iY);
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                    LOGARG("CZoomGestureRecogniser: area, %d,%d %d,%d, range: %d", m_area.iTl.iX, m_area.iTl.iY, m_area.iBr.iX, m_area.iBr.iY, m_rangesizeInPixels);
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                }
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                // the lower left rectangle is m_rangesizeIPixels from the corner
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                TRect lowerleft(m_area.iTl.iX, m_area.iBr.iY-m_rangesizeInPixels,
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                        m_area.iTl.iX+m_rangesizeInPixels, m_area.iBr.iY) ;
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                TRect upperright(m_area.iBr.iX-m_rangesizeInPixels, m_area.iTl.iY,
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                        m_area.iBr.iX, m_area.iTl.iY+m_rangesizeInPixels) ;
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                m_previoustouch = m_startingtouch = puie->CurrentXY() ;
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                m_delta = 0 ;
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                if (lowerleft.Contains(m_startingtouch) || upperright.Contains(m_startingtouch))
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                {
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                    if (m_loggingenabled)
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                    {
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                        LOGARG("CZoomGestureRecogniser: ZOOM IN/OUT, (%d,%d) in %d,%d %d,%d, range: %d",
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                            m_startingtouch.iX, m_startingtouch.iY,
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                            m_area.iTl.iX, m_area.iTl.iY, m_area.iBr.iX, m_area.iBr.iY,
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                            m_rangesizeInPixels);
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                    }
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                    m_zooming = true ;
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                    if (lowerleft.Contains(m_startingtouch))
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                    {
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                        m_zoomtype = EZoomIn ;
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                    }
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                    else
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                    {
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                        m_zoomtype = EZoomOut ;
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                    }
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                    state = ELockToThisGesture ;    // keep zooming until release
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                    TTwoPointGesture pgest(KUid, m_startingtouch, m_startingtouch);
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                    pgest.setLogging(m_loggingenabled) ;
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                    pgest.setDetails(m_delta) ;
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                    pgest.setName(m_zoomtype == EZoomIn ? KZoomInName() : KZoomOutName()) ;
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                    pgest.setType(m_zoomtype);
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   111
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                    // Call the listener to inform that a gesture has happened
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                    m_listener->gestureEnter(pgest) ;
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                }
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                else
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                {
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                    // It is not our gesture so do nothing...
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                }
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            }
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            else
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            {
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                // It is not touch, so not our initiating UI event.. do nothing
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            }
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        }
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        else
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        {
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            // We are already zooming, calculate the changes in zooming factor if it looks we are still zooming
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            if (eventCode == stmUiEventEngine::ERelease) // ERelease stops zooming
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   129
            {
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                // We were zooming, but if there are multiple touches we are not any more
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                m_listener->gestureExit(KUid) ; // should we call this or not?
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            }
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            else    // all other UI events will keep on zooming
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            {
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                state = ELockToThisGesture ;    // Keep the gesture
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                const TPoint& p = puie->CurrentXY() ;
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                float newdist = calculateDistance(p) ;
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                float olddist = calculateDistance(m_previoustouch) ;
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                m_previoustouch = p ;
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                m_delta = adjustZoom(olddist, newdist) ;
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                state = EGestureActive ;
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   142
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                // Inform listener only if there is something to say
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                if (m_delta != 0)
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                {
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                    TTwoPointGesture pgest = TTwoPointGesture(KUid, p, m_startingtouch);
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                    pgest.setLogging(m_loggingenabled) ;
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                    pgest.setDetails(m_delta) ;
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                    pgest.setName(m_zoomtype == EZoomIn ? KZoomInName() : KZoomOutName()) ;
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                    pgest.setType(m_zoomtype);
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   151
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                    // Call the listener to inform that a gesture has happened
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                    m_listener->gestureEnter(pgest) ;
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   154
                }
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            }
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        }
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    }
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   158
    else
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    {
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        if (m_zooming)
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        {
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            // We were zooming, but if there are multiple touches we are not any more
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            m_listener->gestureExit(KUid) ; // should we call this or not?
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   164
        }
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        m_zooming = false ;
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   166
    }
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    return state;
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   168
}
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   169
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void CZoomGestureRecogniser::release(MGestureEngineIf*)
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{
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    if (m_zooming)
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    {
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        m_zooming = false ;
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        m_listener->gestureExit(KUid) ; // should we call this or not?
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   176
    }
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   177
    if (m_loggingenabled)
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   178
    {
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        LOGARG("CZoomGestureRecogniser: 0x%x release", this);
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    }
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   181
}
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   182
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   183
void CZoomGestureRecogniser::setRange(int rangeInPixels)
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{
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    m_rangesizeInPixels = rangeInPixels ;
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   186
}
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   187
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   188
void CZoomGestureRecogniser::setArea(const TRect& theArea)
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   189
{
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    m_area = theArea ;
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   191
    if (m_loggingenabled)
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   192
    {
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        LOGARG("CZoomGestureRecogniser: set area, %d,%d %d,%d",
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   194
                m_area.iTl.iX, m_area.iTl.iY, m_area.iBr.iX, m_area.iBr.iY);
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   195
    }
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   196
}
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   197
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   198
/*!
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 * calculate the distance, return as as float
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   200
 */
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   201
float CZoomGestureRecogniser::calculateDistance(const TPoint& tp)
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   202
{
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   203
    double x = ((m_startingtouch.iX-tp.iX)*(m_startingtouch.iX-tp.iX)) +
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                ((m_startingtouch.iY-tp.iY)*(m_startingtouch.iY-tp.iY)) ;
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    double ddist ;
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   206
    Math::Sqrt(ddist, x) ;
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    return ddist ;
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   208
}
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   209
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int CZoomGestureRecogniser::adjustZoom(float& aPreviousDistance, float aNewDistance)
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{
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    float diff = aNewDistance - aPreviousDistance ;
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    float logdiff = diff ;
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   214
    if (diff < 0) diff = -diff ;
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   215
    float changePercentage = (diff/aPreviousDistance)*100.f ;
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   216
    if (changePercentage > 10.f)
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   217
    {
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        // change more than 10%, make at most 10%
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        float newdiff = aPreviousDistance*0.1f;
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   220
        if (aPreviousDistance > aNewDistance) newdiff = -newdiff ;
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   221
        if (m_loggingenabled)
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   222
        {
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            LOGARG("CZoomGestureRecogniser: adjust zoom from %f to %f : was, now %f %f",
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                double(logdiff), double(newdiff), double(aPreviousDistance), double(aNewDistance));
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        }
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        aPreviousDistance = aPreviousDistance + newdiff ;
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        diff = newdiff ;
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    }
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    else
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    {
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        if (m_loggingenabled)
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        {
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            LOGARG("CZoomGestureRecogniser: adjust zoom from %f to %f : was, now %f %f",
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                double(logdiff), double(diff), double(aPreviousDistance), double(aNewDistance));
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        }
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        aPreviousDistance = aNewDistance ;  // accept the new value and update the new length
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        diff = logdiff ;    // put the original back
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    }
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    return (int)diff ;
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}