--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/webengine/webkitutils/stmgesturefw/src/zoomgesturerecogniser.cpp Tue Feb 02 00:56:45 2010 +0200
@@ -0,0 +1,242 @@
+/*
+* 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 ;
+}