/*

* Copyright (c) 2002-2006 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:  ClearScreen handler is responsible for clearing screen when

*                DisplayText has sent immediate response and it is still active

*                when any other command starts to execute.

*

*/

#ifndef CCLEARSCREENHANDLER_H

#define CCLEARSCREENHANDLER_H

//  INCLUDES

#include <e32base.h>

#include "MSatEventObserver.h"

// CONSTANTS

// FORWARD DECLARATIONS

class MSatUtils;

// CLASS DECLARATION

/**

*  CClearScreenHandler for ClearScreen event

*

*  @lib DisplayTextCmd.lib

*  @since Series 60 3.0

*/

class CClearScreenHandler : public CBase,

                            public MSatEventObserver

    {

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        * @param aUtils SAT Utils interface

        */

        static CClearScreenHandler* NewL( MSatUtils& aUtils );

        /**

        * Destructor.

        */

        virtual ~CClearScreenHandler();

    public: // New functions

        /**

        * Updates immediate response state to ETrue or EFalse

        * @param aState new state

        */

        void UpdateImmediateState( TBool aState );

    public: // From MSatEventObserver

        /**

        * Notification of event.

        * @param aEvent Identifies the event.

        */

        void Event( TInt aEvent );

    private:

        /**

        * C++ default constructor.

        * @param aUtils SAT Utils interface

        */

        CClearScreenHandler( MSatUtils& aUtils );

        /**

        * By default Symbian 2nd phase constructor is private.

        */

        void ConstructL();

        /**

        * Sends the request for clear screen.

        */

        void ClearScreen();

    private:    // Data

        // Holds immediate response's status.

        TBool iImmediateResponse;

        // Utils interface

        MSatUtils& iUtils;

    };

#endif      // CCLEARSCREENHANDLER_H

// End of File