akntouchgesturefw/inc/akntouchgesturefwpinchrecognizer.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:00:49 +0200
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/*
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* Copyright (c) 2009 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:  Pinch touch gesture recognizer.
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*
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*/
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#ifndef C_AKNTOUCHGESTUREFWPINCHRECOGNIZER_H
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#define C_AKNTOUCHGESTUREFWPINCHRECOGNIZER_H
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#include "akntouchgesturefwbaserecognizer.h"
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namespace AknTouchGestureFw {
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/**
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 *  Pinch touch gesture recognizer.
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 *
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 *  @lib akntouchgesturefw
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 *  @since S60 v5.2
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 */
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NONSHARABLE_CLASS( CAknTouchGestureFwPinchRecognizer )
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    : public CAknTouchGestureFwBaseRecognizer
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    {
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public:
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    /**
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     * Two-phased constructor.
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     *
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     * @param  aEngine  The gesture recognition engine.
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     */ 
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    static CAknTouchGestureFwPinchRecognizer* NewL(
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            CAknTouchGestureFwRecognitionEngine& aEngine );
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    /**
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     * Two-phased constructor.
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     *
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     * @param  aEngine  The gesture recognition engine.
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     */
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    static CAknTouchGestureFwPinchRecognizer* NewLC(
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            CAknTouchGestureFwRecognitionEngine& aEngine );
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    /**
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     * Destructor.
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     */
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    virtual ~CAknTouchGestureFwPinchRecognizer();
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public: // From base class CAknTouchGestureFwBaseRecognizer.
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    /**
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     * Returns the recognizer gesture group.
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     * 
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     * @return @c EAknTouchGestureFwGroupPinch
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     */
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    TAknTouchGestureFwGroup GestureGroup() const;
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    /**
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     * Cancels the gesture recognition.
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     */
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    void CancelRecognizing();
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    /**
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     * Handles single pointer event.
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     * 
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     * @param  aPointerData  Pointer event related data.
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     */
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    void HandleSinglePointerEventL( const TPointerEventData& aPointerData );
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    /**
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     * Handles multi pointer event.
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     *
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     * @param  aPointerData            Pointer event related data.
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     * @param  aFirstPointerPosition   First pointer position.
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     * @param  aSecondPointerPosition  Second pointer position.
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     */
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    void HandleMultiPointerEventL( const TPointerEventData& aPointerData,
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                                   const TPoint& aFirstPointerPosition,
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                                   const TPoint& aSecondPointerPosition );
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private:
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    /**
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     * C++ constructor.
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     *
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     * @param  aEngine  The gesture recognition engine.
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     */
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    CAknTouchGestureFwPinchRecognizer(
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            CAknTouchGestureFwRecognitionEngine& aEngine );
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    /**
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     * Resets recognizer's state.
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     */
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    void Reset();
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    /**
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     * Starts multi-touch recognition.
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     *
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     * @param  aFirstPointerPos   Position of first pointer.
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     * @param  aSecondPointerPos  Position of second pointer.
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     */
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    void StartMultiRecognizing(
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            const TPoint& aFirstPointerPos,
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            const TPoint& aSecondPointerPos );
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   115
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    /**
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     * Handles multi-touch recognition cycle.
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     * Called for every drag event when one pointer is down. 
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     *
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     * @param aEventTime Time of pointer event.
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     * @param  aFirstPointerPos   New position of first pointer.
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     * @param  aSecondPointerPos  New position of second pointer.
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     */
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    void MultiRecognizeL(
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            const TTime& aEventTime,
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            const TPoint& aFirstPointerPos,
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            const TPoint& aSecondPointerPos );
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    /**
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     * Completes multi touch recognition.
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     * 
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     * @param aEventTime Time of pointer event.
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     */
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    void CompleteMultiRecognizingL(
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            const TTime& aEventTime );
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    /**
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     * Asks engine to send pinch event to observer.
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     * 
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     * @param aGestureState  Pinch gesture state.
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     * @param aMovementDelta delta movement.
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     */
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    void SendPinchEventL( 
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            TAknTouchGestureFwState aGestureState, 
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            TInt aMovementDelta );
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    /**
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     * Returns pinch initial threshold.
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     *
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     * @return Pinch initial threshold.
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     */
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    TInt PinchInitialThreshold() const;
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    /**
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     * Returns pinch movement threshold.
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     *
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     * @return Pinch movement threshold.
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     */
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    TInt PinchMovementThreshold() const;
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    /**
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     * Returns pinch direction change sensitivity.
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     * 
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     * @return pinch direction change sensitivity.
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     */
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    TInt PinchDirectionChangeSensitivity() const;
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    /**
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     * Returns pinch direction reset sensitivity.
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     *
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     * @return pinch direction reset sensitivity.
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     */
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    TInt PinchDirectionResetSensitivity() const;
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    /**
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     * Returns pinch dimension threshold.
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     * 
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     * @return pinch dimension threshold.
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     */
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    TInt PinchDimensionThreshold() const;
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    /**
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     * Returns pinch maximum confirmation duration.
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     * 
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     * @return pinch maximum confirmation duration.
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     */
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    TInt PinchMaximumConfirmationDuration() const;
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    /**
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     * Calculates bounding rect so that both aPoint1 and aPoint2 are inside
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     * the rectangle.
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     *
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     * @param aPoint1 First position.
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     * @param aPoint2 Second position.
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     * @return Bounding rect.
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     */
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    static TRect CalculateBoundingRect( 
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            const TPoint& aPoint1, 
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            const TPoint& aPoint2 );
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    /**
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     * Snaps aValue to aReference if they are sufficiently close 
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     * (defined by aMargin).
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     *
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     * @param aValue Value to be checked.
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     * @param aReference Reference value.
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     * @param aMargin Margin (applied to all directions).
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     */
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    static void NormalizeValue( TInt& aValue, TInt aReference, TInt aMargin );
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    /**
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     * Calculates movement value from width & height delta.
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     * 
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     * @param aWidthDelta Width delta.
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     * @param aHeightDelta Height delta.
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     * @return movement value, 0 if no movement.
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     */
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    static TInt CalculateMovement( TInt aWidthDelta, TInt aHeightDelta );
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    /**
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     * Checks duration threshold.
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     * @param aEventTime Current pointer event time.
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     * @return ETrue if ok, EFalse otherwise.
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     */
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    TBool CheckDurationThreshold( const TTime& aEventTime ) const;
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private: // data
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    /**
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     * Boolean flag to indicate whether pinch gesture has been detected.
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     */
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    TBool iPinchDetected;
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    /**
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     * Current bounding rectangle for pinch.
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     */
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	TRect iPinchRect;
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	/**
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	 * Direction tracer for width.
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	 */
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	TDirectionTracer iPinchWidthTracer;
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	/**
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	 * Direction tracer for height.
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	 */
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	TDirectionTracer iPinchHeightTracer;
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    /**
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     * Pinch width direction tracer reset counter.
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     * If height changes repeatedly without any width changes,
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     * then width direction tracer is reset.
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     */
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	TInt iResetPinchWidthTracer;
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	/**
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	 * Pinch height direction tracer reset counter.
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	 * If width changes repeatedly without any height changes,
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	 * then height direction tracer is reset.
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	 */
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	TInt iResetPinchHeightTracer;
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	/**
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	 * Time (from event) when iStoredWidthDelta & iStoredHeightDelta
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	 * were updated.
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	 */
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	TTime iStoredTime;
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	/**
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	 * Stored width delta value.
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	 */
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	TInt iStoredWidthDelta;
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	/**
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	 * Stored height delta value.
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	 */
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	TInt iStoredHeightDelta;
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	/**
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	 * ETrue if continuous feedback ongoing.
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	 */
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	TBool iContinuousFeedback;
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    };
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} // namespace AknTouchGestureFw
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#endif // C_AKNTOUCHGESTUREFWPINCHRECOGNIZER_H