1 /*

     2 * Copyright (c) 2007-2008 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:    Music control observer interface 

    15 *

    16 */

    17 

    18 

    19 

    20 

    21 #ifndef __MSHWMUSICOBSERVER_H__

    22 #define __MSHWMUSICOBSERVER_H__

    23 

    24 #include <e32std.h>

    25 

    26 /*! 

    27   @class MShwMusicObserver

    28   

    29   @discussion Observes for changes in the music controls volume and on/off state

    30               MPX-specific

    31   */

    32 class MShwMusicObserver

    33     {

    34     public:

    35 

    36         /**

    37          * Notification that music is playing.

    38          * If this method leaves, MusicOff will

    39          * be called.

    40          */

    41         virtual void MusicOnL() = 0;

    42 

    43         /**

    44          * Notification that music is not playing

    45          */

    46         virtual void MusicOff() = 0;

    47 

    48         /**

    49          * Notification that music volume has changed

    50          * @param aCurrentVolume The current volume 

    51          * @param aCurrentVolume The maximum volume 

    52          */

    53         virtual void MusicVolumeL( TInt aCurrentVolume, TInt aMaxVolume ) = 0;

    54 

    55         /**

    56          * Notification that music track had an error

    57          * @param aErrorCode The error code

    58          */

    59         virtual void ErrorWithTrackL( TInt aErrorCode ) = 0;

    60 

    61     protected:

    62 

    63         /** 

    64          * Destructor. No deletion through this interface.

    65          */

    66         virtual ~MShwMusicObserver() {};

    67 

    68     };

    69 

    70 #endif // __MSHWMUSICOBSERVER_H__

    71