/*

* Copyright (c) 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:  header of EventAO class.

*

*/

#ifndef C_CEVENTAO_H

#define C_CEVENTAO_H

//  INCLUDES

#include <e32base.h>

namespace multimedia

    {

    // Observer

    /**

     *  Observer that monitors the Source State changes

     *  @lib EnhancedMediaClient.lib

     *  @since S60 v3.2

     */    

    class MSourceStateObserver

        {

        public:

            virtual void SourceStateChanged() = 0;

        };

    /**

     *  Active Object that monitors the Source State Change

     *  Event from the Source Side

     *  @lib EnhancedMediaClient.lib

     *  @since S60 v3.2

     */    

   class CEventAO : public CActive

        {

        public:  // Constructors and destructor

            /**

             * Function to Create the Object.

             * @param aObserver Observer to callback the Event.

             */

            static CEventAO* NewL(MSourceStateObserver& aObserver);

            /**

            * Destructor.

            */

            virtual ~CEventAO();

            /**

             * From CActive.

             * Indicates that this active object has issued a

             * request and that it is now outstanding 

             *

             * @since S60 v3.2

             */            

            void SetActive();

            /**

             * From CEventAO.

             * Returns the Error Stoted on Completion of the Request

             *

             * @since S60 v3.2

             */            

            TInt Error();

        protected:

            // From CActive

            void RunL();

            void DoCancel();

            TInt RunError( TInt aError );

        private:

            CEventAO( MSourceStateObserver& aObserver );

            void ConstructL();

        private:

            /**

            * Observer stored to Callback

            */

            MSourceStateObserver& iObserver;

            /**

            * Error Stored upon Request Completion

            */

            TInt iError;

        };

    } // namespace multimedia

#endif // C_CEVENTAO_H

// End of File