diff -r 4ea6f81c838a -r 0e9bb658ef58 mmuifw_plat/alf_widgetmodel_api/inc/alf/ialfmodelchangeobserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mmuifw_plat/alf_widgetmodel_api/inc/alf/ialfmodelchangeobserver.h	Wed Sep 01 12:23:18 2010 +0100
@@ -0,0 +1,89 @@
+/*
+* Copyright (c) 2004 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:  This interface defines a generic data type
+*
+*/
+
+
+#ifndef I_ALFMODELCHANGEOBSERVER_H
+#define I_ALFMODELCHANGEOBSERVER_H
+
+//INCLUDES
+
+namespace osncore
+    {
+template <class T> class AlfPtrVector;
+    }
+using namespace osncore;
+
+namespace Alf
+    {
+
+/* Forward declarations*/
+class IAlfModel;
+class AlfModelOperation;
+
+/**
+*  An interface for observing the changes in the model.
+*  @lib hitchcockwidgetmodel.lib
+*  @since S60 ?S60_version
+* @status Draft
+*/
+class IAlfModelChangeObserver
+    {
+public:
+    /** Virtual destructor.*/
+    virtual ~IAlfModelChangeObserver() {}
+
+    /**
+     * Notify the observer that the model has changed.
+     *
+     * @param aModel    The new model.
+     * @since S60 ?S60_version
+     */
+    virtual void modelChanged( IAlfModel& aModel ) = 0;
+
+    /**
+     * Notify the observers that a number of change operations
+     * are about to be performed on the model.
+     *
+     * @param aArrayOfOperation An Array containing the operations performed on the model.
+     * @since S60 ?S60_version
+     */
+    virtual void dataChanging( const AlfPtrVector<AlfModelOperation>& aArrayOfOperation ) = 0;
+
+    /**
+     * Notify the observers that a change operation
+     * is about to be performed on the model.
+     *
+     * @param aOperation    An operation performed on the model.
+     * @since S60 ?S60_version
+     */
+    virtual void dataChanging( const AlfModelOperation& aOperation ) = 0;
+
+    /**
+     * Notify the observers that the data of the model has been changed.
+     * This is called automatically after any DataChangingL() call.
+     *
+     * @since S60 ?S60_version
+     */
+    virtual void dataChanged() = 0;
+    };
+
+
+    } // namespace Alf
+
+#endif // I_ALFMODELCHANGEOBSERVER_H
+
+// End of File