sl@0: /*
sl@0: * Copyright (c) 2004 Nokia Corporation and/or its subsidiary(-ies). 
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description:  Definition of the Audio Effect Observer class.
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: 
sl@0: #ifndef AUDIOEFFECTOBSERVER_H
sl@0: #define AUDIOEFFECTOBSERVER_H
sl@0: 
sl@0: // CLASS DECLARATION
sl@0: 
sl@0: 
sl@0: /**
sl@0: *  Interface class to be implemented by objects that are interested in receiving events from
sl@0: *  audio effect.
sl@0: *
sl@0: *  @since 3.0
sl@0: */
sl@0: class MAudioEffectObserver
sl@0:     {
sl@0:     public:
sl@0: 
sl@0: 		static const TUint KEnabled = 1;				// The effect is enabled.
sl@0: 		static const TUint KDisabled = 2;				// The effect is disabled
sl@0: 		static const TUint KEnforced = 3;				// The effect is enforced
sl@0: 		static const TUint KNotEnforced = 4;			// The effect is not enforced
sl@0: 		static const TUint KLostUpdateRights = 5;		// The effect has lost update rights
sl@0: 		static const TUint KGainedUpdateRights = 6;		// The effect has gained update rights
sl@0: 		static const TUint KSpecificEffectBase = 20;	// Offset to specific effect events
sl@0: 
sl@0:         /**
sl@0:         * Invoked by the audio effect object when the status of the audio effect has changed.
sl@0:         * @since 3.0
sl@0:         * @param aObservedEffect The effect that changed
sl@0:         * @param aEvent The specific event Id of the effect that changed.
sl@0:         */
sl@0:         virtual void EffectChanged( const CAudioEffect* aObservedEffect, TUint8 aEvent ) = 0;
sl@0: 
sl@0:     };
sl@0: 
sl@0: #endif      // AUDIOEFFECTOBSERVER_H
sl@0: 
sl@0: // End of File