akntouchgesturefw/inc/akntouchgesturefwflickrecognizer.h
author William Roberts <williamr@symbian.org>
Mon, 21 Jun 2010 22:36:19 +0100
branchGCC_SURGE
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parent 0 2f259fa3e83a
permissions -rw-r--r--
Mark extraneous symbols as ABSENT (bug 3065)
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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:  Flick touch gesture recognizer.
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*
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*/
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#ifndef C_AKNTOUCHGESTUREFWFLICKRECOGNIZER_H
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#define C_AKNTOUCHGESTUREFWFLICKRECOGNIZER_H
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#include "akntouchgesturefwbaserecognizer.h"
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namespace AknTouchGestureFw {
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class CAknTouchGestureFwDragTracer;
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/**
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 *  Flick 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( CAknTouchGestureFwFlickRecognizer )
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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 CAknTouchGestureFwFlickRecognizer* 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 CAknTouchGestureFwFlickRecognizer* 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 ~CAknTouchGestureFwFlickRecognizer();
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public: // From base class CAknTouchGestureFwBaseRecognizer.
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    /**
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     * Returns recognizer gesture group.
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     *
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     * @return EAknTouchGestureFwGroupFlick
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     */
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    TAknTouchGestureFwGroup GestureGroup() const;
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    /**
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     * Cancels 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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    CAknTouchGestureFwFlickRecognizer(
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            CAknTouchGestureFwRecognitionEngine& aEngine );
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    /**
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     * Symbian second-phase constructor.
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     */
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    void ConstructL();
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    /**
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     * Starts single-touch recognition.
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     *
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     * @param  aPointerPos  Current pointer position.
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     * @param  aTimeStamp   Pointer event time stamp.
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     */
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    void StartSingleRecognizing( const TPoint& aPointerPos,
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                                 const TTime& aTimeStamp );
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   115
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    /**
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     * Handles single-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  aPointerPos  New position of pointer.
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     * @param  aTimeStamp   Pointer event time stamp.
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     */
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    void SingleRecognizeL( const TPoint& aPointerPos,
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                           const TTime& aTimeStamp);
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    /**
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     * Completes single-touch recognition.
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     *
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     * @param  aPointerPos       New position of pointer, valid only if
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     *                           parameter @c aStartMultiTouch is @c EFalse.
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     * @param  aTimeStamp        Pointer event time stamp.                           
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     * @param  aStartMultiTouch  If @c ETrue, recognition was cancelled
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     *                           by multitouch.
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     */
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    void CompleteSingleRecognizingL( const TPoint& aPointerPos,
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                                     const TTime& aTimeStamp,
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                                     TBool aStartMultiTouch );
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    /**
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     * Asks engine to send flick event to observer.
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     *
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     * @param  aGestureType    Flick gesture type.
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     * @param  aPosition       Flick position.
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     * @param  aSpeed          Flick speed.
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     */
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    void SendFlickEventL( TAknTouchGestureFwType aGestureType,
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                          const TPoint& aPosition,
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                          const TPoint& aSpeed );
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    /**
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     * Resets recognizer.
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     */
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    void Reset();
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    /**
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     * Adds a point to the sequences of points that forms the gesture.
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     *
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     * @param  aPoint      The point to add.
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     * @param  aTimeStamp  Pointer event time stamp.
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     */
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    void AddPoint( const TPoint& aPoint,
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                   const TTime& aTimeStamp );
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    /**
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     * Returns @c ETrue if the gesture has no points.
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     *
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     * @return @c ETrue if the gesture has no points.
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     */
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    TBool IsEmpty() const;
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    /**
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     * Checks if flick is recognised. Determines its direction and speed.
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     *
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     * @param  aFlickGestureType  On return type of flick gesture.
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     * @param  aSpeed             On return the speed of the flick.
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     *
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     * @return ETrue if flick is recognized (speed is over threshold).
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     */
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    TBool DetermineFlickTypeAndSpeed(
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            TAknTouchGestureFwType& aFlickGestureType,
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            TPoint& aSpeed );
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    /**
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     * Calculates distance and speed for flick.
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     *
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     * @param  aDistance  In return distance of flick.
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     * @param  aSpeed     In return speed of flick is pixels per seconds.
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     *
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     * @return @c ETrue if there was enought information to calculate values.
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     */
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    TBool CalculateFlickParameters( TPoint& aDistance, TPoint& aSpeed );
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    /**
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     * Handles direction changes in drag.
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     * If direction changes removes unnecessary points before
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     * direction change point.
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     *
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     * @param  aPosition  New position.
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     */
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    void HandleDirectionChanges( const TPoint& aPosition );
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   201
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    /**
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     * Returns elapsed time.
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     *
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     * @param  aStartTime  Time of start point.
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     * @param  aEndTime    Time of end point.
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     *
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     * @return Elapsed time between @c aStartTime and @c aEndTime.
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     */
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    static TTimeIntervalMicroSeconds32 Elapsed( const TTime& aStartTime,
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                                                const TTime& aEndTime );
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    /**
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     * Removes unnecessary (oldest) points before direction change point.
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     *
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     * @param  aNumberOfPoints  Number of points to leave.
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     */
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    void RemovePreviousPoints( TInt aNumberOfPoints );
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    /**
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     * Returns maximum flick buffer length.
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     *
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     * @return Maximum flick buffer length.
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     */
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    TInt MaximumBufferLength() const;
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    /**
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     * Returns flick speed threshold.
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     *
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     * @return Flick speed threshold.
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     */
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    TInt FlickSpeedThreshold() const;
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    /**
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     * Returns flick detection time.
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     *
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     * @return Flick detection time.
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     */
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    TInt FlickDetectionTime() const;
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    /**
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     * Returns flick direction change sensitivity.
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     *
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     * @return Flick direction change sensitivity.
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     */
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    TInt DirectionChangeSensitivity() const;
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private: // data
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    /**
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     * Sequence of points that make up the gesture.
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     * Used only for single-touch gesture.
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     */
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    RArray<TPointEntry> iPoints;
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    /**
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     * Drag tracer instance to detect changes in drag direction
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     * and remove unnecessary points.
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     * Own.
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     */
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    CAknTouchGestureFwDragTracer* iDragTracer;
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    /**
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     * Is the drag threshold exceeded or not.
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     */
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    TBool iThresholdExceeded;
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    /**
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     * Drag threshold area.
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     */
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    TThresholdArea iDragArea;
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    /**
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     * Flick speed.
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     */
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    TPoint iFlickSpeed;
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    /**
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     * Boolean flag to indicate if drag recognition
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     * should be started upon single touch drag.
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     * This flag may be set when multi touch changes to
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     * single (i.e. another pointer was released). 
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     */
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    TBool iStartOnSingleTouchDrag;
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    };
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} // namespace AknTouchGestureFw
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#endif // C_AKNTOUCHGESTUREFWFLICKRECOGNIZER_H