author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 04 May 2010 12:39:35 +0300 | |
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child 3 | 0954f5dd2cd0 |
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/* |
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* Copyright (c) 2010 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 "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: |
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* |
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*/ |
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#ifndef QSTMPINCHGESTURERECOGNISER_H_ |
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#define QSTMPINCHGESTURERECOGNISER_H_ |
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#include <qstmgestureengine_if.h> |
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#include <qstmgesture_if.h> |
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#include <qstmgesturelistener_if.h> |
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namespace qstmGesture |
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{ |
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/*! |
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* Recognise pinching gesture. !!! very experimental !!! |
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* It seems that in capacitive touch in Symbian 9.4 touching with two |
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* fingers causes fast EDrag events which are far from each other. |
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* This gesture recogniser tries to use that feature |
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* to determine when the gestures looks like a pinch. |
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* Would requires a lot of tuning to be really useful, if at all possible. |
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* With current implementation it is easy to zoom in but |
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* almost impossible to zoom out. |
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*/ |
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class QStm_PinchGestureRecogniser : public QStm_GestureRecogniser |
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{ |
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public: |
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static const QStm_GestureUid KUid = EGestureUidPinch; |
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virtual ~QStm_PinchGestureRecogniser(); |
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virtual QStm_GestureRecognitionState recognise(int numOfActiveStreams, QStm_GestureEngineIf* ge) ; |
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virtual void release(QStm_GestureEngineIf* ge) ; |
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virtual QStm_GestureUid gestureUid() const { return KUid; } |
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/* define the pinch triggering as speed value */ |
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/* after EHold has been seen, then any move which is faster than this will enter pinch gesture */ |
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/* note that the value varies depending on techology, speed is measured as pixels / ms */ |
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void setPinchingSpeed(float aSpeed) /*__SOFTFP */; |
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QStm_PinchGestureRecogniser(QStm_GestureListenerIf* listener) ; |
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void calculateZoomingLine() ; |
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float calculateDistance() ; |
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int adjustPinchMove(float& aPreviousDistance, float aNewDistance) ; |
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private: |
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bool m_pinching ; |
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float m_pinchingspeed ; |
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QPoint m_pinchstart ; |
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QPoint m_pinchend ; |
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float m_m ; |
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float m_b ; |
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float m_ddistance ; |
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bool m_holdseen ; |
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QPoint m_holdseenAtPos ; |
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QTime m_holdseenAtTime ; |
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}; |
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} |
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#endif /* QSTMPINCHGESTURERECOGNISER_H_ */ |