/*

* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  RT Gesture helper interface

*

*/

#ifndef _RT_GESTUREOBSERVER_H_

#define _RT_GESTUREOBSERVER_H_

#include <e32std.h>

namespace RT_GestureHelper

{

/// flag that indicates gesture code is a holding code

/// clients should use MGestureEvent::IsHolding

const TInt EFlagHold       = 0x10000000;

enum TGestureCode

    {

    // states

    EGestureStart          = 0x00000001, // gesture just started (user pressed stylus down)

    EGestureDrag           = 0x00000002, // user moved stylus (may be holding or not holding)

    EGestureReleased       = 0x00000003, // user lifted stylus while user was holding

    // gestures

    EGestureUnknown        = 0x00000005, // gesture was not recognised

    // these codes are sent when user lifts stylus (if holding not started)

    EGestureTap            = 0x00000006,

    EGestureDoubleTap      = 0x00000007, // only if double tap is enabled 

                                         // (via CGestureHelper::SetDoubleTapEnabled or

                                         // CGestureControl::SetDoubleTapEnabled)

    EGestureSwipeLeft      = 0x00000008,

    EGestureSwipeRight     = 0x00000009,

    EGestureSwipeUp        = 0x0000000A,

    EGestureSwipeDown      = 0x0000000B,

    EGestureFlick          = 0x0000000C,

    EGestureLongTap        = 0x0000000D,

    EGestureDrop           = 0x0000000E,

    // these codes are sent when user initiates holding by keeping stylus in

    // same place for a longer duration

    EGestureHoldLeft       = EGestureSwipeLeft  | EFlagHold,

    EGestureHoldRight      = EGestureSwipeRight | EFlagHold,

    EGestureHoldUp         = EGestureSwipeUp    | EFlagHold,

    EGestureHoldDown       = EGestureSwipeDown  | EFlagHold

    };

/**

 * Point of float accuracy

 */

NONSHARABLE_STRUCT( TRealPoint )

    {

    inline TRealPoint();

    inline TRealPoint( const TRealPoint& aPoint );

    inline TRealPoint( TReal aX, TReal aY );

    inline TBool operator==( const TRealPoint& aPoint ) const;

    TReal32 iX;

    TReal32 iY;

    };

/**

 * a gesture event

 */

enum TAxis

    {

    EAxisBoth,

    EAxisHorizontal,

    EAxisVertical

    };

class TGestureEvent

{

public:    

    inline TGestureCode Code( TAxis /*aRelevantAxis*/ ) const { return iCode; };

    inline TBool IsHolding() const { return iIsHolding; };

    inline TPoint StartPos() const { return iStartPos; };

    inline TPoint CurrentPos() const { return iCurrPos; }; 

    inline TRealPoint Speed() const { return iSpeed; };

    inline TRealPoint SpeedPercent ( const TRect& /*aEdges*/ ) const { return iSpeedPercent; };

    inline TPoint Distance() const { return iDistance; }; 

    inline void SetCurrentPos(TPoint aPos) { iCurrPos = aPos; };

    inline void SetStartPos(TPoint aPos) {iStartPos = aPos; };

    inline void SetCode(TGestureCode aCode) {iCode = aCode; };

    inline void SetSpeed(TRealPoint aSpeed) { iSpeed = aSpeed; };

    inline void SetDistance(TPoint aDistance) { iDistance = aDistance; };

    inline void SetSpeedPercent(TRealPoint aSpeedPercent) { iSpeedPercent = aSpeedPercent; };

    inline void SetIsHolding(TBool aIsHolding) { iIsHolding = aIsHolding; };

private:    

    TGestureCode   iCode;

    TBool          iIsHolding;

    TPoint         iStartPos;

    TPoint         iCurrPos;

    TRealPoint     iSpeed;

    TRealPoint     iSpeedPercent;

    TPoint         iDistance;

};

/** 

 * Observer that will be notified when user makes gestures

 */

class MGestureObserver

    {

public:

    /**

     * Handle the gesture event

     * @param aEvent event describing the gesture 

     */

    virtual void HandleGestureL( const TGestureEvent& aEvent ) = 0;

    };

// ----------------------------------------------------------------------------

// Default constructor for real point

// ----------------------------------------------------------------------------

//

inline TRealPoint::TRealPoint()

        : iX( 0 ), iY( 0 )

    {    

    }

// ----------------------------------------------------------------------------

// Copy constructor for real point

// ----------------------------------------------------------------------------

//

inline TRealPoint::TRealPoint( const TRealPoint& aPoint )

        : iX( aPoint.iX ), iY( aPoint.iY )

    {    

    }

// ----------------------------------------------------------------------------

// Copy constructor for real point

// ----------------------------------------------------------------------------

//

inline TRealPoint::TRealPoint( TReal aX, TReal aY )

        : iX( aX ), iY( aY )

    {    

    }

// ----------------------------------------------------------------------------

// Default constructor for real point

// ----------------------------------------------------------------------------

//

inline TBool TRealPoint::operator==( const TRealPoint& aPoint ) const

    {    

    return iX == aPoint.iX && iY == aPoint.iY;

    }

} // namespace RT_GestureHelper

#endif // _RT_GESTUREOBSERVER_H_