/*
* 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 <e32math.h>
#include <rt_uievent.h>
#include "filelogger.h"
#include "zoomgesturerecogniser.h"
#include "GenericSimpleGesture.h"
using namespace stmGesture ;
_LIT8(KZoomInName, "ZoomIn") ;
_LIT8(KZoomOutName, "ZoomOut") ;
CZoomGestureRecogniser* CZoomGestureRecogniser::NewL(MGestureListener* aListener)
{
CZoomGestureRecogniser* self = new (ELeave) CZoomGestureRecogniser(aListener) ;
return self;
}
CZoomGestureRecogniser::CZoomGestureRecogniser(MGestureListener* aListener) :
CGestureRecogniser(aListener), m_area(TRect::EUninitialized)
{
m_rangesizeInPixels = 20 ; // by default 20 pixels from the edges is the area
m_zooming = false ;
}
CZoomGestureRecogniser::~CZoomGestureRecogniser()
{
}
TGestureRecognitionState CZoomGestureRecogniser::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 zoom with one pointer
if (numOfActiveStreams == 1)
{
const stmUiEventEngine::MUiEvent* puie = pge->getUiEvents(0);
int countOfEvents = puie->countOfEvents();
stmUiEventEngine::TUiEventCode eventCode = puie->Code();
if (m_loggingenabled)
{
LOGARG("CZoomGestureRecogniser: %d num %d code %d",
eventCode, countOfEvents, eventCode);
}
if (!m_zooming)
{
// We are not yet zoomin, check if we should start, i.e. whether we are
// inside the zoom trigger areas near the corners when touch is done...
if (eventCode == stmUiEventEngine::ETouch) // It must be ETouch inside the corner
{
if (m_loggingenabled)
{
LOGARG("CZoomGestureRecogniser: 0x%x ETouch: num %d code %d, %d",
this, countOfEvents, puie->CurrentXY().iX, puie->CurrentXY().iY);
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);
}
// the lower left rectangle is m_rangesizeIPixels from the corner
TRect lowerleft(m_area.iTl.iX, m_area.iBr.iY-m_rangesizeInPixels,
m_area.iTl.iX+m_rangesizeInPixels, m_area.iBr.iY) ;
TRect upperright(m_area.iBr.iX-m_rangesizeInPixels, m_area.iTl.iY,
m_area.iBr.iX, m_area.iTl.iY+m_rangesizeInPixels) ;
m_previoustouch = m_startingtouch = puie->CurrentXY() ;
m_delta = 0 ;
if (lowerleft.Contains(m_startingtouch) || upperright.Contains(m_startingtouch))
{
if (m_loggingenabled)
{
LOGARG("CZoomGestureRecogniser: ZOOM IN/OUT, (%d,%d) in %d,%d %d,%d, range: %d",
m_startingtouch.iX, m_startingtouch.iY,
m_area.iTl.iX, m_area.iTl.iY, m_area.iBr.iX, m_area.iBr.iY,
m_rangesizeInPixels);
}
m_zooming = true ;
if (lowerleft.Contains(m_startingtouch))
{
m_zoomtype = EZoomIn ;
}
else
{
m_zoomtype = EZoomOut ;
}
state = ELockToThisGesture ; // keep zooming until release
TTwoPointGesture pgest(KUid, m_startingtouch, m_startingtouch);
pgest.setLogging(m_loggingenabled) ;
pgest.setDetails(m_delta) ;
pgest.setName(m_zoomtype == EZoomIn ? KZoomInName() : KZoomOutName()) ;
pgest.setType(m_zoomtype);
// Call the listener to inform that a gesture has happened
m_listener->gestureEnter(pgest) ;
}
else
{
// It is not our gesture so do nothing...
}
}
else
{
// It is not touch, so not our initiating UI event.. do nothing
}
}
else
{
// We are already zooming, calculate the changes in zooming factor if it looks we are still zooming
if (eventCode == stmUiEventEngine::ERelease) // ERelease stops zooming
{
// We were zooming, but if there are multiple touches we are not any more
m_listener->gestureExit(KUid) ; // should we call this or not?
}
else // all other UI events will keep on zooming
{
state = ELockToThisGesture ; // Keep the gesture
const TPoint& p = puie->CurrentXY() ;
float newdist = calculateDistance(p) ;
float olddist = calculateDistance(m_previoustouch) ;
m_previoustouch = p ;
m_delta = adjustZoom(olddist, newdist) ;
state = EGestureActive ;
// Inform listener only if there is something to say
if (m_delta != 0)
{
TTwoPointGesture pgest = TTwoPointGesture(KUid, p, m_startingtouch);
pgest.setLogging(m_loggingenabled) ;
pgest.setDetails(m_delta) ;
pgest.setName(m_zoomtype == EZoomIn ? KZoomInName() : KZoomOutName()) ;
pgest.setType(m_zoomtype);
// Call the listener to inform that a gesture has happened
m_listener->gestureEnter(pgest) ;
}
}
}
}
else
{
if (m_zooming)
{
// We were zooming, but if there are multiple touches we are not any more
m_listener->gestureExit(KUid) ; // should we call this or not?
}
m_zooming = false ;
}
return state;
}
void CZoomGestureRecogniser::release(MGestureEngineIf*)
{
if (m_zooming)
{
m_zooming = false ;
m_listener->gestureExit(KUid) ; // should we call this or not?
}
if (m_loggingenabled)
{
LOGARG("CZoomGestureRecogniser: 0x%x release", this);
}
}
void CZoomGestureRecogniser::setRange(int rangeInPixels)
{
m_rangesizeInPixels = rangeInPixels ;
}
void CZoomGestureRecogniser::setArea(const TRect& theArea)
{
m_area = theArea ;
if (m_loggingenabled)
{
LOGARG("CZoomGestureRecogniser: set area, %d,%d %d,%d",
m_area.iTl.iX, m_area.iTl.iY, m_area.iBr.iX, m_area.iBr.iY);
}
}
/*!
* calculate the distance, return as as float
*/
float CZoomGestureRecogniser::calculateDistance(const TPoint& tp)
{
double x = ((m_startingtouch.iX-tp.iX)*(m_startingtouch.iX-tp.iX)) +
((m_startingtouch.iY-tp.iY)*(m_startingtouch.iY-tp.iY)) ;
double ddist ;
Math::Sqrt(ddist, x) ;
return ddist ;
}
int CZoomGestureRecogniser::adjustZoom(float& aPreviousDistance, float aNewDistance)
{
float diff = aNewDistance - aPreviousDistance ;
float logdiff = diff ;
if (diff < 0) diff = -diff ;
float changePercentage = (diff/aPreviousDistance)*100.f ;
if (changePercentage > 10.f)
{
// change more than 10%, make at most 10%
float newdiff = aPreviousDistance*0.1f;
if (aPreviousDistance > aNewDistance) newdiff = -newdiff ;
if (m_loggingenabled)
{
LOGARG("CZoomGestureRecogniser: adjust zoom from %f to %f : was, now %f %f",
double(logdiff), double(newdiff), double(aPreviousDistance), double(aNewDistance));
}
aPreviousDistance = aPreviousDistance + newdiff ;
diff = newdiff ;
}
else
{
if (m_loggingenabled)
{
LOGARG("CZoomGestureRecogniser: adjust zoom from %f to %f : was, now %f %f",
double(logdiff), double(diff), double(aPreviousDistance), double(aNewDistance));
}
aPreviousDistance = aNewDistance ; // accept the new value and update the new length
diff = logdiff ; // put the original back
}
return (int)diff ;
}