/*

 * Copyright (c) 2004 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:  Definition of the Audio Effect Observer class.

 *

 */

 #ifndef AUDIOEFFECTOBSERVER_H

 #define AUDIOEFFECTOBSERVER_H

 // CLASS DECLARATION

 /**

 *  Interface class to be implemented by objects that are interested in receiving events from

 *  audio effect.

 *

 *  @since 3.0

 */

 class MAudioEffectObserver

     {

     public:

 		static const TUint KEnabled = 1;				// The effect is enabled.

 		static const TUint KDisabled = 2;				// The effect is disabled

 		static const TUint KEnforced = 3;				// The effect is enforced

 		static const TUint KNotEnforced = 4;			// The effect is not enforced

 		static const TUint KLostUpdateRights = 5;		// The effect has lost update rights

 		static const TUint KGainedUpdateRights = 6;		// The effect has gained update rights

 		static const TUint KSpecificEffectBase = 20;	// Offset to specific effect events

         /**

         * Invoked by the audio effect object when the status of the audio effect has changed.

         * @since 3.0

         * @param aObservedEffect The effect that changed

         * @param aEvent The specific event Id of the effect that changed.

         */

         virtual void EffectChanged( const CAudioEffect* aObservedEffect, TUint8 aEvent ) = 0;

     };

 #endif      // AUDIOEFFECTOBSERVER_H

 // End of File