--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/webengine/webkitutils/stmgesturefw/inc/pinchgesturerecogniser.h	Wed Sep 01 12:28:30 2010 +0100
@@ -0,0 +1,87 @@
+/*
+* 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:Pinch Gesture Recognizer
+*
+*/
+
+#ifndef PINCHGESTURERECOGNISER_H_
+#define PINCHGESTURERECOGNISER_H_
+
+#include "rt_gestureengineif.h"
+#include <rt_gestureif.h>
+#include <rt_gesturelistener.h>
+
+class CCoeControl ;
+
+namespace stmGesture
+{
+/*!
+ * Recognise pinching gesture. !!! very experimental !!!
+ * It seems that in capacitive touch in Symbian 9.4 touching with two
+ * fingers causes fast EDrag events which are far from each other.
+ * This gesture recogniser tries to use that feature
+ * to determine when the gestures looks like a pinch.
+ * Would requires a lot of tuning to be really useful, if at all possible.
+ * With current implementation it is easy to zoom in but
+ * almost impossible to zoom out.
+ */
+NONSHARABLE_CLASS( CPinchGestureRecogniser ): public CGestureRecogniser
+{
+public:
+    static const TGestureUid KUid = EGestureUidPinch;
+
+    static CPinchGestureRecogniser* NewL(MGestureListener* aListener);
+
+    virtual ~CPinchGestureRecogniser();
+    /*!
+     * MGestureRecogniserIf methods
+     */
+    virtual TGestureRecognitionState recognise(int numOfActiveStreams, MGestureEngineIf* ge) ;
+    virtual void release(MGestureEngineIf* ge) ;
+
+    virtual TGestureUid gestureUid() const
+        {
+        return KUid;
+        }
+
+    /* define the pinch triggering as speed value */
+    /* after EHold has been seen, then any move which is faster than this will enter pinch gesture */
+    /* note that the value varies depending on techology, speed is measured as pixels / ms */
+    void setPinchingSpeed(float aSpeed) __SOFTFP;
+
+private:
+    CPinchGestureRecogniser(MGestureListener* aListener) ;
+
+    void calculateZoomingLine() ;
+    float calculateDistance() ;
+    int adjustPinchMove(float& aPreviousDistance, float aNewDistance) ;
+
+private:
+    bool m_pinching ;
+    float m_pinchingspeed ;
+    TPoint m_pinchstart ;
+    TPoint m_pinchend ;
+
+    float m_m ;
+    float m_b ;
+
+    float m_ddistance ;
+    bool m_holdseen ;
+    TPoint m_holdseenAtPos ;
+    TTime m_holdseenAtTime ;
+};
+
+}
+
+#endif /* PINCHGESTURERECOGNISER_H_ */