author | chetan.kapoor@v800025.ad-sfpd.intra |
Tue, 27 Oct 2009 10:58:40 +0000 | |
branch | CompilerCompatibility |
changeset 25 | 9d87bae3dc1b |
parent 8 | 7c90e6132015 |
child 37 | cb62a4f66ebe |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008-2009 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 the License "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 class |
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* |
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*/ |
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#ifndef _GESTURE_H_ |
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#define _GESTURE_H_ |
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#include <e32base.h> |
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#include "rt_gestureobserver.h" |
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#include "gesturerecogniser.h" |
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#include "pointarray.h" |
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namespace RT_GestureHelper |
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{ |
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enum TEventState |
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{ |
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ENoEvent = 0, |
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ETouchDown, |
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ETouchUp, |
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EMove, |
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ELongTouchDown |
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}; |
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/** |
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* TGesture represents the gesture that the user has made. |
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* Implements MGestureEvent interface to allow clients to |
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* inspect the gesture |
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*/ |
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NONSHARABLE_CLASS( CGesture ) : public CBase |
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{ |
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public: |
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/** destructor */ |
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~CGesture(); |
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/** |
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* @return a new gesture that will have only the first point |
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* of this gesture. Can be used to create gesture's a "start" event |
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* after some other points have been received. |
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*/ |
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CGesture* AsStartEventLC() const; |
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/** |
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* Sets the gesture as empty. resets timers to receive points |
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* immediately |
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*/ |
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void Reset(); |
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/** @return ETrue if the gesture has no points */ |
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TBool IsEmpty() const; |
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/** |
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* Add a point to the sequence of points that forms the gesture |
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* Call Reset() just before adding the first point |
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* @param aPoint the point to add |
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* @return error code |
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*/ |
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TInt AddPoint( const TPoint& aPoint, const TTime& eventtime); |
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/** Set the visual of this gesture. Should be called when gesture starts */ |
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/** @return ETrue if the point is very near the holding point */ |
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TBool IsNearHoldingPoint( const TPoint& aPoint ) const; |
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/** Set the latest point as the holding point */ |
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void SetHoldingPoint(); |
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/** @return ETrue if aPoint is the same as point added last */ |
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TBool IsLatestPoint( const TPoint& aPoint ) const; |
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/** |
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* After call, Code(...) will return appropriate holding gesture code. |
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*/ |
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void StartHolding(); |
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/** |
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* After call, Code(...) will return a "hold released" gesture code when |
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* the gesture is completed. Meanwhile, code will be drag. |
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*/ |
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void ContinueHolding(); |
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/** Set as stylus released */ |
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void SetReleased(); |
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/** Set the gesture as complete. Gesture is completed at pointer up */ |
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void SetComplete(); |
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/** After call, Code(...) will return a "cancelled" gesture code */ |
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void SetCancelled(); |
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/** force returning a code as double tap when gesture is complete */ |
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void SetDoubleTap(); |
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/** |
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* @return Whether the current gesture is a tap (and hence not a swipe) |
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* Does not consider holding or other state information (such as |
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* whether the gesture was just started or is dragging). |
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* Results are based purely on the current stream of points. |
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*/ |
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TBool IsTap() const; |
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void SetLongTap(TBool aLongTap); |
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// From MGestureEvent |
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TTime TimeOfLastEntry() const; |
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inline TGestureCode PreviousGestureCode() { return iPrevGestureCode; }; |
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TGestureCode Code( TAxis aRelevantAxis ); |
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TBool IsHolding() const; |
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TPoint StartPos() const; |
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TPoint CurrentPos() const; |
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TRealPoint Speed() const; |
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TRealPoint SpeedPercent( const TRect& aEdges ) const; |
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TPoint Distance() const; |
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private: |
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/** @return elapsed time between the latest and previous points */ |
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inline TTimeIntervalMicroSeconds32 TimeFromPreviousPoint() const; |
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/** @return elapsed time between the latest and first points */ |
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inline TTimeIntervalMicroSeconds32 TimeFromStart() const; |
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/** @return ETrue if user has stopped moving the stylus before lifting it */ |
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inline TBool IsMovementStopped() const; |
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/** @return aOffset'th last entry in the list of points */ |
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inline const TPointEntry& NthLastEntry( TInt aOffset ) const; |
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/** @return previous point (may not be exactly the point before last) */ |
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inline const TPointEntry& PreviousEntry() const; |
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/** @return position of point received just before the latest point */ |
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inline TPoint PreviousPos() const; |
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TBool IsFlick() const; |
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private: |
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/// sequence of points that make up the gesture. own. |
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RArray< TPointEntry > iPoints; |
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/// index in iPoints of the point in which user started holding |
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TInt iHoldingPointIndex; |
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/// the different states that indicate whether user has made a holding gesture |
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enum THoldingState |
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{ |
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ENotHolding = 0, // before holding activated (i.e., holding not activated) |
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EHoldStarting, // holding activated just now (lasts just one callback round) |
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EHolding // holding activated earlier |
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}; |
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/// state that indicates is user has held the pointer down in one position |
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/// for long time to indicate a holding gesture |
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THoldingState iHoldingState; |
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/// Whether the gesture completion code will be forcefully overridden to be double tap, |
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/// regardless of what the points are |
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TBool iIsDoubleTap; |
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enum TCompletionState |
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{ |
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// Note: implementation assumes this order of enums |
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ENotComplete = 0, |
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ECancelled, |
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EComplete, |
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EReleased |
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}; |
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/// gesture only becomes complete when user lifts the pointer |
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TCompletionState iState; |
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/// time when the stylus was lifted. |
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TTime iCompletionTime; |
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/// visual relevant to this gesture. null if not known. |
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TGestureCode iPrevGestureCode; |
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TBool iIsLongTap; |
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TBool iIsStopFlick; |
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}; |
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} // namespace GestureHelper |
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#endif // _GESTURE_H_ |