akntouchgesturefw/inc/akntouchgesturefwpointerstate.h
author Pat Downey <patd@symbian.org>
Tue, 13 Jul 2010 11:36:42 +0100
branchRCL_3
changeset 43 07b3ec0df257
parent 0 2f259fa3e83a
permissions -rw-r--r--
Merge workaround for bug 2846 to conditionally compile out the use of CAlfEffectObserver.
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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:  Touch gesture framework pointer state.
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*
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*/
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#ifndef C_AKNTOUCHGESTUREFWPOINTERSTATE_H
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#define C_AKNTOUCHGESTUREFWPOINTERSTATE_H
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#include "akntouchgesturefwutils.h"
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namespace AknTouchGestureFw {
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/**
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 * Maximum amount of simultaneous pointers supported by the
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 * touch gesture framework.
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 */
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const TInt KMaxPointerCount( 2 );
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/**
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 * Represents a single pointer data
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 */
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struct TPointerData
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    {
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    TPoint iPosition;
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    TPoint iStartPosition;
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    TBool iIsPressedDown;
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    TBool iTargetedToControl;
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    };
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/**
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 * Touch gesture framework pointer state.
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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( CAknTouchGestureFwPointerState ) : public CBase
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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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    static CAknTouchGestureFwPointerState* NewL();
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    /**
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     * Two-phased constructor.
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     */
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    static CAknTouchGestureFwPointerState* NewLC();
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    /**
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     * Destructor.
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     */
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    virtual ~CAknTouchGestureFwPointerState();
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    /**
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     * Resets pointer state.
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     */
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    void Reset();
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    /**
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     * Updates pointer-related data.
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     *
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     * @param  aPointerData  Pointer event related data.
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     */
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    TBool Update( const TPointerEventData& aPointerData );
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    /**
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     * Provides the position of first pointer.
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     *
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     * @return First pointer position.
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     */
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    TPoint* FirstPointerPosition();
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    /**
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     * Provides the position of second pointer.
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     *
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     * @return Second pointer position.
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     */
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    TPoint* SecondPointerPosition();
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    /**
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     * Returns @c ETrue if two pointers are down.
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     *
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     * @return @c ETrue if two pointer are down.
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     */
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    TBool IsDoubleTouch() const;
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    /**
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     * Returns @c ETrue if single pointer is down.
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     *
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     * @return @c ETrue if single pointer is down.
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     */
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    TBool IsSingleTouch() const;
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    /**
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     * Returns @c ETrue if no pointers are down.
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     *
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     * @return @c ETrue if no pointers are down.
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     */
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    TBool IsNoTouch() const;
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    /**
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     * Returns @c ETrue if event was invalid because of two successive
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     * down events.
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     *
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     * @return @c ETrue if two successive down events were received.
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     */
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    TBool SuccessiveDownEventsReceived();
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private:
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    /**
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     * C++ constructor.
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     */
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    CAknTouchGestureFwPointerState();
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    /**
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     * Updates order of pointers. In practice updates variables
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     * @c iFirstPointerNumber an @c iSecondPointerNumber.
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     *
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     * @c iFirstPointerNumber contains always the number (=id) of pointer
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     * that was pressed down first and/or released last.
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     *
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     * @c iSecondPointerNumber contains always the number (=id) of pointer
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     * that was pressed down when first pointer was already down and/or
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     * released first when another pointer was still down.
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     *
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     * @param  aPointerType    Pointer state
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     * @param  aPointerNumber  Number (=id) of the pointer
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     */
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    void UpdatePointerOrder( TPointerEvent::TType aPointerType,
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                             TInt aPointerNumber );
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    /**
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     * Returns @c ETrue if pointer event is valid (for example up received
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     * after down).
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     *
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     * @param  aPointerType    New pointer state.
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     * @param  aPointerNumber  Pointer number.
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     *
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     * @return @c ETrue if valid & can be accepted, @c EFalse otherwise.
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     */
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    TBool IsValidEvent( TPointerEvent::TType aPointerType,
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                        TInt aPointerNumber );
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    /**
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     * Returns @c ETrue if pointers are down outside control area.
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     * 
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     * @return @c ETrue if pointers are down outside control area.
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     */
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    TBool PointersDownOutsideControlArea() const;
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private: // data
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    /**
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     * Pointer number (=id) of pointer that was pressed down first.
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     */
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    TInt iFirstPointerNumber;
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    /**
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     * Pointer number (=id) of pointer that was pressed down next.
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     */
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    TInt iSecondPointerNumber;
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    /**
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     * Data for each pointer.
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     */
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    TPointerData iPointerData[ KMaxPointerCount ];
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    /**
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     * Tells number of pointers pressed down.
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     */
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    TInt iPointerCount;
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    /**
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     * @c ETrue if event was invalid because of two successive down events.
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     * Used only for testing.
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     */
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    TBool iSuccessiveDownEvents;
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    };
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} // namespace AknTouchGestureFw
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#endif // C_AKNTOUCHGESTUREFWPOINTERSTATE_H