/*

* Copyright (c) 2009-2009 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:  CDisplayServiceLight class declaration.

*

*/

#ifndef DISPLAYSERVICELIGHT_H

#define DISPLAYSERVICELIGHT_H

// SYSTEM INCLUDE FILES

#include <hwrmlight.h>

// USER INCLUDE FILES

#include "displayservicebase.h"

// FORWARD DECLARATIONS

// DATA TYPES

// CLASS DECLARATION

/**

 * Display light service provides context information about

 * the display light status.

 *

 * @lib None.

 * @since S60 5.0

 */

NONSHARABLE_CLASS( CDisplayServiceLight ): public CDisplayServiceBase,

public MHWRMLightObserver

    {

public:

    /**

     * Symbian two phased constructors.

     *

     * @since S60 5.0

     * @param aCF Interface to Context Access API.

     * @return CDisplayServiceLight*

     */

    static CDisplayServiceLight* NewL( MCFContextInterface& aCF );

    static CDisplayServiceLight* NewLC( MCFContextInterface& aCF );

    /**

     * C++ destructor.

     */

    virtual ~CDisplayServiceLight();

public: // From base classes

    // @see CDisplayServiceBase

    virtual void StartL();

    // @see CDisplayServiceBase

    virtual void Stop();

    // @see MHWRMLightObserver

    virtual void LightStatusChanged( TInt aTarget,

        CHWRMLight::TLightStatus aStatus );

private: // New methods

    // Publishes the display state value

    void PublishContext( CHWRMLight::TLightStatus aStatus );

private:

    CDisplayServiceLight( MCFContextInterface& aCF );

    void ConstructL();

private: // Data

    /** HWRM Light client connection */

    CHWRMLight* iLight;

    /** Last light status stored to avoid publishing state status twice */

    CHWRMLight::TLightStatus iCurrentStatus;

    };

#endif // DISPLAYSERVICELIGHT_H