/*

* 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 the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

* which accompanies this distribution, and is available

* at the URL "http://www.symbianfoundation.org/legal/licencesv10.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