--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mmsharing/mmshui/inc/musuicallbackservice.h	Wed Sep 01 12:31:01 2010 +0100
@@ -0,0 +1,122 @@
+/*
+* Copyright (c) 2005 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:  
+*
+*/
+
+
+#ifndef MUSUICALLBACKSERVICE_H
+#define MUSUICALLBACKSERVICE_H
+
+#include "musuidefinitions.h"
+#include <e32base.h>
+
+class MMusUiCallbackObserver;
+
+
+/**
+ * Callback Service used to pass asynchronous events
+ */
+class CMusUiCallbackService : public CActive
+    {
+
+public: // Constructors and destructor
+
+    /**
+    * Two-phased constructor.
+    * @param aCallbackObserver the observer that will receive the callbacks.
+    * @return new instance of CMusUiCallbackService.
+    */
+    static CMusUiCallbackService* NewL( 
+                            MMusUiCallbackObserver& aCallbackObserver );
+    
+    /**
+    * Destructor.
+    */
+    ~CMusUiCallbackService();
+
+private: // Constructors
+
+    /**
+    * C++ default constructor.
+    * @param aCallbackObserver the observer that will receive the callbacks.
+    */
+    CMusUiCallbackService( MMusUiCallbackObserver& aCallbackObserver );
+    
+    /**
+    * By default Symbian 2nd phase constructor is private.
+    */
+    void ConstructL();
+
+
+public: // New functions
+
+    /**
+    * Buffer a request to trigger an event.
+    * @param aEventId    Id of the event
+    */
+    void AsyncEventL( TMusUiAsyncEvent aEventId );
+
+    /**
+    * Called when the notifier has been deactivated so resources can be 
+    * freed and outstanding messages completed.
+    */
+    void Cancel();
+    
+    /**
+    * Check what event is currently pending
+    * @return EMusUiAsyncUninitialized is no events are pending
+    */
+    TMusUiAsyncEvent CurrentEvent() const;
+
+
+public: // Functions from CActive base class
+    
+    /**
+    * From CActive.  Called when a request completes.
+    */
+    void RunL();
+
+    /**
+    * From CActive.  Called when a leave occurres in RunL.
+    * @param aError Symbian OS errorcode.
+    * @return Error Code.
+    */
+    TInt RunError(TInt aError);
+    
+    /**
+    * From CActive.  Called when a request is cancelled.
+    */
+    void DoCancel();  
+
+
+private: // New functions
+
+    /**
+    * Activate the object.
+    */
+    void Activate();
+
+
+private:    // Data
+
+    /**  Handle to callback observer. */
+    MMusUiCallbackObserver& iCallbackObserver;
+
+    /**  Event ID to pass through. */
+    TMusUiAsyncEvent iEventId;
+
+    };
+
+#endif // MUSUICALLBACKSERVICE_H