--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/classicui_plat/ganes_api/inc/ganes/HgScrollBufferObserverIface.h	Tue Feb 02 01:00:49 2010 +0200
@@ -0,0 +1,55 @@
+/*
+* Copyright (c) 2009 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 HGSCROLLBUFFEROBSERVERIFACE_H_
+#define HGSCROLLBUFFEROBSERVERIFACE_H_
+
+#include <e32base.h>
+#include <ganes/HgBufferOwnerIface.h>
+
+/**
+ * Buffer observer interface. 
+ */
+class MHgScrollBufferObserver : public MHgBufferOwner 
+    {
+public:
+    /**
+     * The direction of request.
+     */
+    enum THgScrollDirection
+        {
+        EHgBufferNoMove, // Request initiated by adding or removing an item 
+        EHgBufferReset, // Full buffer reset
+        EHgBufferScrollUp, // Request items before the buffer
+        EHgBufferScrollDown // Request items after the buffer
+        };
+
+public:
+    /**
+     * Buffer position changed. 
+     * The items between the aBufferStart and aBufferEnd should be loaded as soon as possible.
+     * 
+     * @param aBufferStart The index of the first item in buffer.
+     * @param aBufferEnd The index of the last item in buffer.
+     * @param aDirection Scroll direction.
+     */
+    virtual void Request(TInt aRequestStart, TInt aRequestEnd, THgScrollDirection aDirection) = 0 ;
+    
+    };
+
+#endif // HGSCROLLBUFFEROBSERVERIFACE_H_