author | chetan.kapoor@v800025.ad-sfpd.intra |
Tue, 27 Oct 2009 10:58:40 +0000 | |
branch | CompilerCompatibility |
changeset 25 | 9d87bae3dc1b |
parent 8 | 7c90e6132015 |
permissions | -rw-r--r-- |
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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 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 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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#include <coemain.h> |
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#include <rt_gesturehelper.h> |
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struct TPointerEvent; |
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namespace RT_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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class CGestureEventFilter; |
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class CGestureEventSender; |
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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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/** 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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/** Reset helper state */ |
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void Reset(); |
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void SetLastEventTime() {iLastEventTime.HomeTime(); } /*CCoeEnv::Static()->LastEvent().Time();*/ |
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TTime GetLastEventTime() const { return iLastEventTime; } |
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private: |
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/** Constructor */ |
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CGestureHelperImpl( MGestureObserver& aObserver ); |
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TBool noneAlf_HandlePointerEventL( const TPointerEvent& aEvent); |
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/** @return ETrue if the helper has not started processing a gesture */ |
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inline TBool IsIdle() 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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/** 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 EmitFirstTapEvent(); |
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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 CompleteAndEmit( 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 EmitCancelEvent(); |
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/** |
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* Send Released event |
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*/ |
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void EmitReleasedEvent(); |
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/** Notify observer of the gesture */ |
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void EmitEvent( 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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void HandleTouchUp(const TPointerEvent& aEvent); |
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void HandleTouchDownL(const TPointerEvent& aEvent); |
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void HandleMoveL(const TPointerEvent& aEvent); |
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void HandleLongTouch(); |
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void EmitDoubleTapEvent(); |
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TBool IsMovementGesture(TGestureCode aCode); |
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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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TTime iLastEventTime; |
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TTime iLastTouchUpTime; |
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TTime iLastDoubleTapTime; |
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CCallbackTimer* iLongTouchTimer; |
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CGestureEventFilter* iEventFilter; |
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CGestureEventSender* iEventSender; |
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}; |
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} // GestureHelper |
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#endif // _GESTUREHELPERIMPL_H_ |