/*

 * Copyright (c) 2009 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:

 *

 *

 */

#ifndef TMS_EFFECT_OBSRVR_H

#define TMS_EFFECT_OBSRVR_H

// Include files

#include <tms.h>

namespace TMS {

// FORWARD DECLARATIONS

class TMSEffect;

/**

 * TMSEffectObserver class

 *

 * This class provides callback mechanism for TMSEffect listeners.

 *

 * Client class that wants to receive events from TMSEffect concrete class

 * objects must inherit from TMSEffectObserver class and register itself with

 * the TMSEffect object.

 *

 * Functions declared in this class are called when effect events occur.

 *

 * The client must not do any blocking, or perform any CPU-intensive operations

 * in the callback methods. It is recommended that the client saves event data,

 * returns from this function immediately and if necessary, responds to

 * the event in asynchronous way.

 *

 * Usage:

 * <code>

 * // Register as observer to TMSVolumeEffect

 * iClient->AddObserver(*this);

 * ...

 * // Unregister (optional)

 * iClient->RemoveObserver(*this);

 * ...

 * </code>

 *

 * @lib tmsapi.lib

 *

 */

class TMSEffectObserver

    {

public:

    /**

     * Signal Effects event.

     *

     * This method is called when an Effects event occurs.

     *

     * Effect types:

     *  TMS_EFFECT_GLOBAL_VOL

     *  TMS_EFFECT_GLOBAL_GAIN

     *  TMS_EFFECT_VOLUME

     *  TMS_EFFECT_GAIN

     *

     * Notified events:

     *  TMS_EVENT_EFFECT_VOL_CHANGED

     *  TMS_EVENT_EFFECT_GAIN_CHANGED

     *

     * @param  tmseffect

     *

     * @param  event

     *      Event descriptor.

     *

     */

    };

} //namespace TMS

#endif // TMS_EFFECT_OBSRVR_H

// End of file