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diff --git a/offapi/com/sun/star/awt/tree/XTreeExpansionListener.idl b/offapi/com/sun/star/awt/tree/XTreeExpansionListener.idl
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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+#ifndef __com_sun_star_awt_tree_XTreeExpansionListener_idl__
+#define __com_sun_star_awt_tree_XTreeExpansionListener_idl__
+
+#ifndef __com_sun_star_lang_XEventListener_idl__
+#include <com/sun/star/lang/XEventListener.idl>
+#endif
+
+#ifndef __com_sun_star_awt_tree_TreeExpansionEvent_idl__
+#include <com/sun/star/awt/tree/TreeExpansionEvent.idl>
+#endif
+
+#ifndef __com_sun_star_awt_tree_ExpandVetoException_idl__
+#include <com/sun/star/awt/tree/ExpandVetoException.idl>
+#endif
+
+//=============================================================================
+
+module com {  module sun {  module star {  module awt {  module tree {
+
+//=============================================================================
+
+/** An instance of this interface can get notifications from a <type>TreeControl</type>
+    when nodes are expanded or collapsed.
+
+    @see XTreeControl::addTreeExpansionListener
+    @see XTreeControl::removeTreeExpansionListener
+ */
+published interface XTreeExpansionListener: com::sun::star::lang::XEventListener
+{
+    /** Invoked when a node with children on demand is about to be expanded.
+
+        <p>This event is invoked befor the <method>treeExpanding()</method>
+        event.</p>
+    */
+    void requestChildNodes( [in] TreeExpansionEvent Event );
+
+    /** Invoked whenever a node in the tree is about to be expanded.
+
+        @throws ExpandVetoException
+            to notify the calling <type>XTreeControl</type> that expanding
+            <member>TreeExpansionEvent::Node</member> should faild.
+    */
+    void treeExpanding( [in] TreeExpansionEvent Event )
+        raises ( ExpandVetoException );
+
+    /** Invoked whenever a node in the tree is about to be collapsed.
+
+        @throws ExpandVetoException
+            to notify the calling <type>XTreeControl</type> that collapsing
+            <member>TreeExpansionEvent::Node</member> should faild.
+    */
+    void treeCollapsing( [in] TreeExpansionEvent Event )
+        raises ( ExpandVetoException );
+
+    /** Called whenever a node in the tree has been succesfully expanded. */
+    void treeExpanded( [in] TreeExpansionEvent Event );
+
+    /** Called whenever a node in the tree has been succesfully collapsed. */
+    void treeCollapsed( [in] TreeExpansionEvent Event );
+};
+
+//=============================================================================
+
+}; }; }; }; };
+
+#endif