/*

* 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:  CDisplayContextBase class declaration.

*

*/

#ifndef DISPLAYSERVICEBASE_H

#define DISPLAYSERVICEBASE_H

// SYSTEM INCLUDE FILES

#include <e32base.h>

// USER INCLUDE FILES

// FORWARD DECLARATIONS

class CCFContextObject;

class MCFContextInterface;

// DATA TYPES

// CLASS DECLARATION

/**

 * Base class for all display type contexts.

 *

 * @lib None.

 * @since S60 5.0

 */

NONSHARABLE_CLASS( CDisplayServiceBase ): public CBase

    {

public:

    // Display service type

    enum TDisplayServiceType

        {

        EDisplayLightStatus,

        EDisplayUILayout

        };

    virtual ~CDisplayServiceBase();

public:

    /**

     * Start the display service.

     * All the contexts must be defined here and also the initial value needs

     * to be set. This can also be done asynchronously.

     * 

     * @since S60 5.0

     * @param None.

     * @return None.

     */

    virtual void StartL() = 0;

    /**

     * Stop the display service.

     * 

     * @since S60 5.0

     * @param None.

     * @return None.

     */

    virtual void Stop() = 0;

public:

    /**

     * Return the display context type.

     * 

     * @since S60 5.0

     * @param None.

     * @return None.

     */

    TInt DisplayServiceType() const;

protected:

    /**

     * Default C++ constructor.

     */

    CDisplayServiceBase( TDisplayServiceType aType,

        MCFContextInterface& aCF );

    /**

     * Symbian 2nd phase constructor.

     */

    void ConstructL();

protected: // Data

    /** Context associated with the display service */

    CCFContextObject* iContext;

    /** Reference to the Context Access API */

    MCFContextInterface& iCF;

    /** Handle to the current thread */

    RThread iThread;

private: // Private data

    /** Display context type */

    TDisplayServiceType iType;

    };

#endif // DISPLAYCONTEXTBASE_H