1 /*

     2 * Copyright (c) 2002-2006 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 *     This class defines a audio volume change observer interface.

    16 *

    17 */

    18 

    19 

    20 #ifndef __MVRVOLUMECHANGEOBSERVER_H__

    21 #define __MVRVOLUMECHANGEOBSERVER_H__

    22 

    23 // INCLUDES

    24 #include <e32def.h>

    25 

    26 // CLASS DEFINITION

    27 /**

    28 * This class defines a audio volume change observer interface.

    29 */

    30 class MVRVolumeChangeObserver 

    31 	{

    32 	public: // new methods

    33 

    34 		/**

    35 		* Called to notify a change in volume settings.

    36 		* @param aStep Volume level in steps

    37 		* @param aMaxSteps How many steps there are (10 usually).

    38 		*/

    39 		virtual void SetVolume( TInt aStep, TInt aMaxSteps ) = 0;

    40 		

    41 		/***

    42 		* Indicates if volume can be set, because rinto tone

    43 		* volume change has no effect if the tone is playing.

    44 		*/

    45 		virtual TBool CanSetVolume() = 0;

    46 	};

    47 

    48 #endif // __MVRVOLUMECHANGEOBSERVER_H__