--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/slideshow/engine/inc/shwmusicobserver.h	Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,71 @@
+/*
+* Copyright (c) 2007-2008 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:
+*
+* Description:    Music control observer interface 
+*
+*/
+
+
+
+
+#ifndef __MSHWMUSICOBSERVER_H__
+#define __MSHWMUSICOBSERVER_H__
+
+#include <e32std.h>
+
+/*! 
+  @class MShwMusicObserver
+  
+  @discussion Observes for changes in the music controls volume and on/off state
+              MPX-specific
+  */
+class MShwMusicObserver
+    {
+    public:
+
+        /**
+         * Notification that music is playing.
+         * If this method leaves, MusicOff will
+         * be called.
+         */
+        virtual void MusicOnL() = 0;
+
+        /**
+         * Notification that music is not playing
+         */
+        virtual void MusicOff() = 0;
+
+        /**
+         * Notification that music volume has changed
+         * @param aCurrentVolume The current volume 
+         * @param aCurrentVolume The maximum volume 
+         */
+        virtual void MusicVolumeL( TInt aCurrentVolume, TInt aMaxVolume ) = 0;
+
+        /**
+         * Notification that music track had an error
+         * @param aErrorCode The error code
+         */
+        virtual void ErrorWithTrackL( TInt aErrorCode ) = 0;
+
+    protected:
+
+        /** 
+         * Destructor. No deletion through this interface.
+         */
+        virtual ~MShwMusicObserver() {};
+
+    };
+
+#endif // __MSHWMUSICOBSERVER_H__
+