mulwidgets/gesturehelper/src/gesturehelperimpl.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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* Copyright (c) 2007 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:  Gesture helper implementation
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*
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*/
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#ifndef _GESTUREHELPERIMPL_H_
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#define _GESTUREHELPERIMPL_H_
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#include <e32base.h>
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class CAlfEnv;
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class CAlfDisplay;
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class CAlfVisual;
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class TAlfEvent;
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struct TPointerEvent;
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namespace GestureHelper
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{
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class CCallbackTimer;
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class CGesture;
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class CPointerCapturer;
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class MGestureObserver;
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/**
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 * Implementation of CGestureHelper interface
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 */
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NONSHARABLE_CLASS( CGestureHelperImpl ) : public CBase
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    {
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public:
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    /** 2-phase constructor */
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    static CGestureHelperImpl* NewL( MGestureObserver& aObserver );
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    /** Destructor */
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    ~CGestureHelperImpl();    
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    void InitAlfredPointerCaptureL( CAlfEnv& aEnv, CAlfDisplay& aDisplay, 
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        TInt aFreeControlGroupId );
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    /** See @ref CGestureHelper::SetHoldingEnabled */
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    void SetHoldingEnabled( TBool aEnabled );
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    /** See @ref CGestureHelper::IsHoldingEnabled */
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    TBool IsHoldingEnabled() const;
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    /** See @ref CGestureHelper::SetDoubleTapEnabled */
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    void SetDoubleTapEnabled( TBool aEnabled );
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    /** See @ref CGestureHelper::IsDoubleTapEnabled */
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    TBool IsDoubleTapEnabled() const;
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    /** See @ref CGestureHelper::HandlePointerEventL */
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    TBool HandlePointerEventL( const TPointerEvent& aEvent );
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    /** See @ref CGestureHelper::OfferEventL */
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    TBool OfferEventL( const TAlfEvent& aEvent );
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    /** Reset helper state */
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    void Reset();
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    /** See @ref CGestureHelper::AddObserver */
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    void AddObserver(MGestureObserver* aObserver); 
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    /** Returns true the current event is a stray event form another visual */
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    TBool StrayEvent( const TPointerEvent& aEvent ) const;
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private:
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    /**
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     * Analyse how the pointer event affects the current gesture, and potentially
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     * notify the observer. 
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     * @param aVisual visual on which the event fell on or NULL if not known
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     * @return ETrue if the event was consumed
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     */
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    TBool HandlePointerEventL( const TPointerEvent& aEvent, CAlfVisual* aVisual );
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     /**
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      * Analyse how the pointer event affects the current gesture, and potentially
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      * notify the observer. 
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      * @param aVisual visual on which the event fell on or NULL if not known
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      * @return ETrue if the event was consumed
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      */
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     TBool HandleSinglePointerEventL( const TPointerEvent& aEvent, CAlfVisual* aVisual );
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     /**
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      * Analyse how the pointer event affects the current gesture, and potentially
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      * notify the observer. 
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      * @param aVisual visual on which the event fell on or NULL if not known
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      * @return ETrue if the event was consumed
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      */
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     TBool HandleMultiplePointerEventL( const TPointerEvent& aEvent, const TInt aPointerNumber );
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    /** @return ETrue if the helper has not started processing a gesture */
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    inline TBool IsIdle( TBool aPointerNumber = 0 ) const;
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    /** Add a point to the sequence of points that make up the gesture */
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    inline void AddPointL( const TPointerEvent& aEvent );    
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    /** Add a point to the sequence of points that make up the gesture */
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    inline TInt AddPoint( const TPointerEvent& aEvent );
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    /** Add a point to the sequence of points that make up the gesture */
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    inline void AddSecondaryPointL( const TPointerEvent& aEvent );    
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    /** Add a point to the sequence of points that make up the gesture */
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    inline TInt AddSecondaryPoint( const TPointerEvent& aEvent );
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    /** Verify if the currnet pointer event recived is valid and expected */
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    inline TBool ValidatePointer( const TPointerEvent& aEvent, const TInt aPointerNumber) const;
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    /** return if there is a second pointer held down */
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    inline TBool IsMultiTouch() const;
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    /** Add points to corresponding array depending on aPointerNumber, return whether the point is added or not */   
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    inline TBool AddMultiTouchPointsL( const TPointerEvent& aEvent, const TInt aPointerNumber);
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    /** Activates holding and notifies observer that holding has been started */
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    void StartHoldingL();
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    /* Set previous tag gesture to null (and recycle the gesture object) */
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    static void RecyclePreviousTapGesture( TAny* aSelf );
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    /** Emits a tap event since second tap of a double tap was not received within timeout */
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    void EmitFirstTapEventL();
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    /** Emit the start gesture event that aGesture would have produced */
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    void EmitStartEventL( const CGesture& aGesture );
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    /** 
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     * Send code event if not holding. Also sets the event to released and emits again.
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     * Modifies aGesture! 
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     */
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    void CompleteAndEmitSingleTouchL( CGesture& aGesture );
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    /** 
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     * Send code event if pinch. Also sets the event to released and emits again.
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     * Modifies aGesture! 
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     */   
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    void CompleteAndEmitDoubleTouchL( CGesture& aGesture );
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    /** 
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     * Send cancel event about the latest gesture client was notified about 
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     * Sets the latest gesture to Cancelled.
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     */
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    void EmitCancelEventL();
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    /** Notify observer of the gesture */
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    void EmitEventL( const CGesture& aGesture );
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    /** 
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     * (re)start holding timer at the current point.
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     * Does not restart holding if the point (in aEvent) is near enough to where holding 
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     * was started earlier. (Allows small movement but still starting holding.
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     */
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    void StartHoldingTimer( const TPointerEvent& aNewEvent );
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    /** 
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     * @return a gesture object from the gesture pool 
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     * Getting gestures from the gesture pool avoids the need to create gestures
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     * after construction. There is max only one gesture object in the pool, 
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     * but no more is needed 
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     */
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    CGesture* NewGesture();
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    /** Move the gesture into the gesture pool, and set aGesturePointer to null */
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    void RecycleGesture( CGesture*& aGesturePointer );
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private:
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    /// Gesture is the logical representation of a sequence of points arriving
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    /// at certain times
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    /// This is the current gesture
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    CGesture* iGesture;
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    /// Tap gesture of the previous gesture. Used when double tap is enabled.
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    /// The gesture is cached, since it cannot be emitted until gesture helper
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    /// knows whether the next gesture forms a double tap
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    /// @see CGestureHelperImpl::iDoubleTapTimer
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    CGesture* iPreviousTapGesture;
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    /// This is a recyclable object pool with just one object.
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    /// This class needs one or two gesture objects at any one time. There is one
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    /// less error condition to handle if gesture objects are not created after
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    /// construction. Therefore, if only one gesture object is needed at a specific,
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    /// point in time, the unused gesture object is stored here.
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    CGesture* iUnusedGesture;
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    /// When double tap is enabled, a tap
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    /// event (and it's released event) is only emitted after the double tap timeout
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    /// passes. If user taps again before the timeout (in the same position),
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    /// this gesture is emitted as a double tap (followed by the released event, 
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    /// and the second tap is not emitted at all.
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    /// If user taps, and then swipes before the double tap timeout, this tap
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    /// event (and it's released event) event is emitted, and only then the swipe's
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    /// down and drag events are emitted. In other words, if user presses down
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    /// during the timeout, the down event it not emitted until the gesture
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    /// helper knows that the gesture is not another tap.
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    /// Behavior while double tap enabled:
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    /// Swipe: Down + drag + up => emits down + swipe/cancel + released
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    /// Tap: Down + up => emits down ... timeout ... + tap + released
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    /// Double tap: Down + up + down + up => emits down ... double tap + released
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    /// Tap + quick swipe: Down + up + down + drag + ... => emits down ... tap + up (for tap) + down (for swipe ) + drag + ...
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    /// Double tap timer is cancelled when the second pointer down event is received,
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    /// i.e., it does not matter if user does this: 
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    /// down + up + down ... long wait ... + up. It's still a double tap.
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    CCallbackTimer* iDoubleTapTimer;
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    /// holding is activated when user keeps pointer down in the same place for 
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    /// a longer period. the holding timer activates off when enough time has passed.
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    CCallbackTimer* iHoldingTimer;
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    /// observer for gesture events
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    MGestureObserver* iObserver;
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    /// captures subsequent pointer events after pointer down received,
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    /// until pointer up
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    CPointerCapturer* iPointerCapturer;
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    /// Tells number of pointers pressed down.
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    TInt iPointerCount;
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    /// Tells the pointer number of the current pointers pressed down.
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    /// Valid only when single pointer is touched down.
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    TInt iCurrentPointer;    
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    };
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} // GestureHelper
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#endif // _GESTUREHELPERIMPL_H_