diff -r d189ee25cf9d -r 3533d4323edc emailuis/uicomponents/inc/fstreevisualizerobserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/emailuis/uicomponents/inc/fstreevisualizerobserver.h	Wed Sep 01 12:28:57 2010 +0100
@@ -0,0 +1,146 @@
+/*
+* Copyright (c) 2007 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:  An observer interface for the tree list component.
+*
+*/
+
+
+#ifndef M_FSTREEVISUALIZEROBSERVER_H
+#define M_FSTREEVISUALIZEROBSERVER_H
+
+#include "fstreelistconstants.h"
+
+/**
+ * MFsTreeObserver defines an interface which is used to observe tree list 
+ * events.
+ *
+ * Observer of the tree list is notified of changes in the tree list through 
+ * this interface with appropriate events.
+ * @code
+ *
+ * @endcode
+ *
+ * @lib 
+ */
+NONSHARABLE_CLASS( MFsTreeVisualizerObserver )
+    {
+public:
+
+    enum TFsTreeVisualizerEvent
+        {
+        
+        // <cmail> "Base class modifications for using touch"
+        /**
+         * Action started for selected tree item.
+         */
+        EFsTreeItemTouchAction,
+        
+        /**
+         * Long tap action started for selected tree item. 
+         */
+        EFsTreeItemTouchLongTap,
+                
+        /**
+         * Touch focus for list gained. 
+         */
+        EFsTreeItemTouchFocused,    
+        
+        // </cmail>
+
+        
+        /**
+         * An item received focus.
+         */
+        EFsTreeItemFocused,
+        
+        /**
+         * Focus will be moved to the specified item/node.
+         * Event triggered just before an item gets focus.
+         * No action required.
+         */
+        EFsTreeItemWillGetFocused,
+        
+        /**
+         * An item has been selected.
+         */
+        EFsTreeItemSelected,
+        /**
+         * An item with menu has been selected.
+         */
+        EFsTreeItemWithMenuSelected,
+        /**
+         * Right arrow pressed.
+         */
+        EFsTreeKeyRightArrow,
+        /**
+         * Left arrow pressed.
+         */
+        EFsTreeKeyLeftArrow,
+        
+        /**
+         * Event generated when the list is fully hidden.
+         */
+        EFsTreeListVisualizerHidden,
+        
+        /**
+         * Event generated when the list is fully shown.
+         */
+        EFsTreeListVisualizerShown,
+
+        // <cmail>
+        /**
+         * Event generated when a single node is collapsed.
+         */
+        EFsTreeListItemCollapsed,
+        /**
+         * Event generated when a single node is expanded.
+         */
+        EFsTreeListItemExpanded,
+        /**
+         * Event generated when all nodes are collapsed.
+         */
+        EFsTreeListCollapsedAll,
+        /**
+         * Event generated when all nodes are expanded.
+         */
+        EFsTreeListExpandedAll,
+        // </cmail>
+        /**
+         * Change focus visibility
+         */
+        EFsChangeFocusVisibility
+        };    
+
+public:
+
+    /**
+     * Observer of the tree list is notified of changes in the tree list
+     * through this function.
+     * 
+     * @param aEvent Event which happend in the tree list.
+     * @param aId Id of the node/item associated with the event. KFsTreeNoneID
+     *            means that the event is not associated with a node/item.
+     * @param aPoint Event coordinates. Only valid for touch events.
+     */
+    // <cmail> Touch
+    virtual void TreeVisualizerEventL( 
+            const TFsTreeVisualizerEvent aEvent, 
+            const TFsTreeItemId aId = KFsTreeNoneID,
+            const TPoint& aPoint = TPoint( 0,0 ) ) const = 0;
+    // </cmail>
+    
+    };
+    
+     
+#endif // M_FSTREEVISUALIZEROBSERVER_H