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diff --git a/chart2/source/controller/inc/ObjectHierarchy.hxx b/chart2/source/controller/inc/ObjectHierarchy.hxx
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+++ b/chart2/source/controller/inc/ObjectHierarchy.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#ifndef INCLUDED_CHART2_SOURCE_CONTROLLER_INC_OBJECTHIERARCHY_HXX
+#define INCLUDED_CHART2_SOURCE_CONTROLLER_INC_OBJECTHIERARCHY_HXX
+
+#include <ObjectIdentifier.hxx>
+
+namespace com::sun::star::awt { struct KeyEvent; }
+namespace com::sun::star::chart2 { class XChartDocument; }
+
+#include <memory>
+#include <vector>
+
+namespace chart
+{
+
+class ExplicitValueProvider;
+
+namespace impl
+{
+class ImplObjectHierarchy;
+}
+
+class ObjectHierarchy
+{
+public:
+    typedef std::vector< ObjectIdentifier > tChildContainer;
+
+    /** @param bFlattenDiagram
+            If <TRUE/>, the content of the diagram (data series, wall, floor,
+            etc.) is treated as being at the same level as the diagram. (This is
+            used for keyboard navigation).
+     */
+    explicit ObjectHierarchy(
+        const css::uno::Reference< css::chart2::XChartDocument > & xChartDocument,
+        ExplicitValueProvider * pExplicitValueProvider,
+        bool bFlattenDiagram = false,
+        bool bOrderingForElementSelector = false );
+    ~ObjectHierarchy();
+
+    static ObjectIdentifier      getRootNodeOID();
+    static bool      isRootNode( const ObjectIdentifier& rOID );
+
+    /// equal to getChildren( getRootNodeOID())
+    tChildContainer  getTopLevelChildren() const;
+    bool             hasChildren( const ObjectIdentifier& rParent ) const;
+    tChildContainer  getChildren( const ObjectIdentifier& rParent ) const;
+
+    tChildContainer  getSiblings( const ObjectIdentifier& rNode ) const;
+
+    /// The result is empty, if the node cannot be found in the tree
+    ObjectIdentifier             getParent( const ObjectIdentifier& rNode ) const;
+    /// @returns -1, if no parent can be determined
+    sal_Int32        getIndexInParent( const ObjectIdentifier& rNode ) const;
+
+private:
+
+    std::unique_ptr< impl::ImplObjectHierarchy > m_apImpl;
+};
+
+class ObjectKeyNavigation
+{
+public:
+    explicit ObjectKeyNavigation( const ObjectIdentifier & rCurrentOID,
+                                  const css::uno::Reference< css::chart2::XChartDocument > & xChartDocument,
+                                  ExplicitValueProvider * pExplicitValueProvider );
+
+    bool handleKeyEvent( const css::awt::KeyEvent & rEvent );
+    const ObjectIdentifier& getCurrentSelection() const { return m_aCurrentOID;}
+
+private:
+    void setCurrentSelection( const ObjectIdentifier& rOID );
+    bool first();
+    bool last();
+    bool next();
+    bool previous();
+    bool up();
+    bool down();
+    bool veryFirst();
+    bool veryLast();
+
+    ObjectIdentifier m_aCurrentOID;
+    css::uno::Reference< css::chart2::XChartDocument > m_xChartDocument;
+    ExplicitValueProvider * m_pExplicitValueProvider;
+};
+
+} //  namespace chart
+
+// INCLUDED_CHART2_SOURCE_CONTROLLER_INC_OBJECTHIERARCHY_HXX
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */