/*

* Copyright (c) 2008 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:   Handles Web Scrolling Deceleration

*

*/

#ifndef WEBSCROLLINGDECELERATORGH_H

#define WEBSCROLLINGDECELERATORGH_H

//  INCLUDES

#include <e32base.h>

#include <coedef.h>

#include <w32std.h>

#include <rt_gestureobserver.h>

// MACROS

// FORWARD DECLARATIONS

class WebView;

class WebScrollbarDrawer;

// CLASS DECLARATION

class WebScrollingDeceleratorGH: public CBase

    {

    public:  // Constructor and destructor

        /**

        * Two-phased constructor.

        */

        static WebScrollingDeceleratorGH* NewL(WebView& webView);

        /**

        * Destructor.

        */

        virtual ~WebScrollingDeceleratorGH();

    private:

        /**

        * C++ default constructor.

        */

        WebScrollingDeceleratorGH(WebView& webView);

        /**

        * By default Symbian 2nd phase constructor is private.

        */

        void ConstructL();

    public: // Main functions

        void startDecel(RT_GestureHelper::TRealPoint& speed, WebScrollbarDrawer* scrollbarDrawer);

        void cancelDecel();

        void scroll();

        int getDecceleration();

    private:    // Data

        // Pointer to owning view

        WebView& m_webView; // not owned

	// scroll delta

        TPoint m_scrolldelta;

        // count of number of scoll steps

        TUint m_numscrollsteps;

        // decelator status flag

        bool m_decelelatorSwitch;

        //normalized current position to minimize rounding error

        TPoint m_normalizedCurrentPosition;

        RT_GestureHelper::TRealPoint m_initSpeed;

        CPeriodic*  m_decelTimer;

        TPoint m_lastPos;

        TPoint m_startPos;

        WebScrollbarDrawer* m_scrollbarDrawer;

    };

#endif      // WEBSCROLLINGDECELERATOR_GH_H

// End of File