/*

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

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "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:  Taskswitcher physic engine

 *

*/

#ifndef TSPHYSICSENGINE_H_

#define TSPHYSICSENGINE_H_

#include <e32base.h>

#include <akntouchgesturefw.h>

// CLASS DECLARATION

class CAknPhysics;

class CTsPhysics;

/**

 * Taskswitcher physic engine implementation

 */

class CTsPhysicsEngine: public CBase

    {

public:

    // Constructors and destructor

    /**

     * Destructor.

     */

    ~CTsPhysicsEngine();

    /**

     * Two-phased constructor.

     */

    static CTsPhysicsEngine* NewL(MAknPhysicsObserver& aPhysicObserver,

            CCoeControl& aViewControl);

    /**

     * Two-phased constructor.

     */

    static CTsPhysicsEngine* NewLC(MAknPhysicsObserver& aPhysicObserver,

            CCoeControl& aViewControl);

private:

    /**

     * Constructor for performing 1st stage construction

     */

    CTsPhysicsEngine();

    /**

     * EPOC default constructor for performing 2nd stage construction

     */

    void ConstructL(MAknPhysicsObserver& aPhysicObserver,

            CCoeControl& aViewControl);

public:

    /**

     * Implements drag gesture handling

     * @param aEvent - drag event

     */

    void HandleDragEvent(AknTouchGestureFw::MAknTouchGestureFwDragEvent& aEvent);

    /**

     * Checks if the physics is running

     */

    TBool IsRunning() const;

    /**

     * Stops physics

     */

    void Stop();

    /**

     * Initialize animation between current position and destination point

     * @param aPoint - destination point 

     */

    void AnimateToTarget(const TPoint& aPoint);

    /**

     * 

     * @param aWorldSize Physics world size.

     * @param aViewSize Physics (visible) view size.

     * @param aLandscape ETrue if physics should work in landscape.     

     **/

    void ReInitPhysicsL(const TSize& aWorldSize, 

                        const TSize& aViewSize,

                        TBool aLandscape);

private:

    /**

     * Physics. 

     * Own.

     */

    CAknPhysics* iPhysics;

    /**

     * Drag start time

     */

    TTime iStartTime;

    /**

     * Drag start position

     */

    TPoint iStartPosition;

    /**

     * Taskswitcher physics for item switch animation

     */

    CTsPhysics* iTaskswitcherPhysics;

    /**

     * Marks direction in which drag events are made:

     * Values: 0 - uninitialized

     *         1 - drag right

     *        -1 - drag left 

     */

    TInt iDragDirection;

    };

#endif /* TSPHYSICSENGINE_H_*/