/*

* Copyright (c) 2002-2005 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:  Observer for system state changes.

*

*/

#ifndef MSATSYSTEMSTATEOBSERVER_H

#define MSATSYSTEMSTATEOBSERVER_H

//  INCLUDES

#include <e32std.h>

// CLASS DECLARATION

/**

*  Observer for system state changes.

*

*  @lib SatSystemState.lib

*  @since Series 60 3.0

*/

class MSatSystemStateObserver

    {

    public: // New functions

        /**

        * Notifies that system state changed.

        */

        virtual void StateChanged() {};

        /**

        * Notifies that system state changed.

        * @param aValue The new value that has changed.

        */

        virtual void StateChanged( const TInt /*aValue*/ ) {};

        /**

        * Notifies that system state changed.

        * @param aValue The new value that has changed.

        */

        virtual void StateChanged( const TReal& /*aValue*/ ) {};

        /**

        * Notifies that system state changed.

        * @param aValue The new value that has changed.

        */

        virtual void StateChanged( const TDesC8& /*aValue*/ ) {};

        /**

        * Notifies that system state changed.

        * @param aValue The new value that has changed.

        */

        virtual void StateChanged( const TDesC16& /*aValue*/ ) {};

    protected:  // New functions

        /**

        * Destructor.

        */

        virtual ~MSatSystemStateObserver() {};

        /**

        * C++ default constructor.

        */

        MSatSystemStateObserver() {};

    private:

        // Prohibit copy constructor if not deriving from CBase.

        MSatSystemStateObserver( const MSatSystemStateObserver& );

        // Prohibit assigment operator if not deriving from CBase.

        MSatSystemStateObserver& operator=( const MSatSystemStateObserver& );

    };

#endif      // MSATSYSTEMSTATEOBSERVER_H

// End of File