diff -r 73a1feb507fb -r bc78a40cd63c mmsharing/mmshui/src/musuicallbackservice.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mmsharing/mmshui/src/musuicallbackservice.cpp	Wed Sep 01 12:31:01 2010 +0100
@@ -0,0 +1,183 @@
+/*
+* Copyright (c) 2005-2006 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:  Asynchronous callback service provider.
+*
+*/
+
+
+
+#include "musuicallbackservice.h"
+#include "musuicallbackobserver.h" // callback observer interface
+#include "muslogger.h"
+
+
+// -----------------------------------------------------------------------------
+// Two-phased constructor.
+// -----------------------------------------------------------------------------
+//
+CMusUiCallbackService* CMusUiCallbackService::NewL(
+                        MMusUiCallbackObserver& aCallbackObserver )
+    {
+    CMusUiCallbackService* self =
+                            new ( ELeave ) CMusUiCallbackService(
+                                                    aCallbackObserver );
+    CleanupStack::PushL( self );
+    self->ConstructL();
+    CleanupStack::Pop( self );
+    return self;
+    }
+
+
+// -----------------------------------------------------------------------------
+// Destructor.
+// -----------------------------------------------------------------------------
+//
+CMusUiCallbackService::~CMusUiCallbackService()
+    {
+    // Cancel active object
+    MUS_LOG( "mus: [MUSUI ]  -> CMusUiCallbackService::~CMusUiCallbackService" );
+    Cancel();
+    MUS_LOG( "mus: [MUSUI ]  <- CMusUiCallbackService::~CMusUiCallbackService" );
+    }
+
+
+// -----------------------------------------------------------------------------
+// C++ default constructor.
+// -----------------------------------------------------------------------------
+//
+CMusUiCallbackService::CMusUiCallbackService(
+                        MMusUiCallbackObserver& aCallbackObserver )
+    : CActive( EPriorityStandard ),
+    iCallbackObserver( aCallbackObserver ),
+    iEventId( EMusUiAsyncUninitialized )
+    {
+    CActiveScheduler::Add( this );
+    }
+
+
+// -----------------------------------------------------------------------------
+//
+// -----------------------------------------------------------------------------
+//
+void CMusUiCallbackService::ConstructL()
+    {
+    }
+
+
+// -----------------------------------------------------------------------------
+// Buffer a request to trigger an event.
+// -----------------------------------------------------------------------------
+//
+void CMusUiCallbackService::AsyncEventL( TMusUiAsyncEvent aEventId )
+    {
+    MUS_LOG( "mus: [MUSUI ]  -> CMusUiCallbackService::AsyncEventL" );
+    iEventId = aEventId;
+    Activate();
+    MUS_LOG( "mus: [MUSUI ]  <- CMusUiCallbackService::AsyncEventL" );
+    }
+
+
+// -----------------------------------------------------------------------------
+// Cancels the active request.
+// -----------------------------------------------------------------------------
+//
+void CMusUiCallbackService::Cancel()
+    {
+    MUS_LOG( "mus: [MUSUI ]  -> CMusUiCallbackService::Cancel" );
+    CActive::Cancel();
+    iStatus = NULL;
+    MUS_LOG( "mus: [MUSUI ]  <- CMusUiCallbackService::Cancel" );
+    }
+
+// -----------------------------------------------------------------------------
+// Check what event is currently pending.
+// -----------------------------------------------------------------------------
+//
+TMusUiAsyncEvent CMusUiCallbackService::CurrentEvent() const
+    {
+    if ( IsActive() )
+        {
+        return iEventId;
+        }
+    return EMusUiAsyncUninitialized;
+    }
+    
+// -----------------------------------------------------------------------------
+// From CActive.  Called when a request completes.
+// -----------------------------------------------------------------------------
+//
+void CMusUiCallbackService::RunL()
+    {
+    MUS_LOG( "mus: [MUSUI ]  -> CMusUiCallbackService::RunL" );
+    if ( iEventId )
+        {
+        // Copy the id from member to local so the member can be cleared.
+        TMusUiAsyncEvent eventId = iEventId;
+        iEventId = EMusUiAsyncUninitialized;
+        // Issue the call to the observer interface.
+        iCallbackObserver.HandleAsyncEventL( eventId );
+        MUS_LOG( "mus: [MUSUI ]  <- CMusUiCallbackService::RunL returns" );
+        return;
+        }
+    MUS_LOG( "mus: [MUSUI ]  <- CMusUiCallbackService::RunL" );
+    }
+
+
+// -----------------------------------------------------------------------------
+// From CActive.  Called when a leave occurres in RunL.
+// -----------------------------------------------------------------------------
+//
+TInt CMusUiCallbackService::RunError( TInt aError )
+    {
+    MUS_LOG1( "mus: [MUSUI ]        CMusUiCallbackService::RunError [%d]",
+                            aError );
+    iCallbackObserver.HandleAsyncError( aError );
+                            
+    return KErrNone;
+    }
+
+
+// -----------------------------------------------------------------------------
+// From CActive.  Called when a request is cancelled.
+// -----------------------------------------------------------------------------
+//
+void CMusUiCallbackService::DoCancel()
+    {
+    MUS_LOG( "mus: [MUSUI ]  -> CMusUiCallbackService::DoCancel" );
+    MUS_LOG( "mus: [MUSUI ]  <- CMusUiCallbackService::DoCancel" );
+    }
+
+
+// -----------------------------------------------------------------------------
+// Activate the object.
+// -----------------------------------------------------------------------------
+//
+void CMusUiCallbackService::Activate()
+    {
+    MUS_LOG( "mus: [MUSUI ]  -> CMusUiCallbackService::Activate" );
+    // Call SetActive() so RunL() will be called by the active scheduler
+    if ( IsActive() )
+        {
+        Cancel();
+        }
+    SetPriority( EPriorityHigh );
+    SetActive();
+    iStatus = KRequestPending;
+    TRequestStatus* stat = &iStatus;
+    User::RequestComplete( stat, KErrNone );
+    
+    MUS_LOG( "mus: [MUSUI ]  <- CMusUiCallbackService::Activate" );
+    }
+
+