/*

* Copyright (c) 2003-2008 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:  ???????????????????

*

*/

#ifndef CCAMZOOMUPDATEMANAGER_H

#define CCAMZOOMUPDATEMANAGER_H

// INCLUDES

#include <e32base.h>

#include "CamAppController.h" // for controller definition

// FORWARD DECLARATIONS

//CLASS DECLARATIONS

/**

*  Camera Zoom Update Class

*

*  Implements a cooldown period to avoid overtaxing the camera driver with touchscreen zoom updates.

*

*  @since 5.0

*/

class CCamZoomUpdateManager : public CActive

    {

    public: // constructors and destructor

        /**

        * Two-phased constructor.

        */

        static CCamZoomUpdateManager* NewL( CCamAppController& aController );

        /**

        * Destructor.

        */

        ~CCamZoomUpdateManager();

        /**

        * From CActive Does the required action (calls the observer)

        */

        void SetZoomValue( TInt aValue );

    protected: // from base classes

        /**

        * From CActive Does the required action (calls the observer)

        */

        void RunL();

        /**

        * From CActive Cancels pending actions

        */

        void DoCancel();

    private: // constructor

        /**

        * C++ default constructor.

        */

        CCamZoomUpdateManager( CCamAppController& aController );

        /**

        * Symbian 2nd phase constructor

        */

        void ConstructL();

        /**

        * Notify the controller and SetActive

        */

        void UpdateAndStartWait();

        /**

        * Get delay values from cenrep

        */

        void ReadDelayValuesL();

    private: // data

        // timer used to facilitate cooldown period

        RTimer  iTimer;

        // time used to force update if active object gets starved

        TTime iCooldownStart;

        // the value to give to the controller

        TInt iValue; 

        // handle outstanding update requests

        TBool iDelayedUpdate; 

        // reference to the controller used for setting the zoom

        CCamAppController& iController;

        // Variated values for cooldown period inbetween 

        // camera driver updates

        TInt iCamZoomCooldown;

        TInt iCamMaxZoomCooldown;

    };

#endif      

// End of File