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diff --git a/sfx2/source/notebookbar/PriorityHBox.hxx b/sfx2/source/notebookbar/PriorityHBox.hxx
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+++ b/sfx2/source/notebookbar/PriorityHBox.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 .
+ */
+
+#include <vcl/IPrioritable.hxx>
+#include <vcl/layout.hxx>
+
+#include <vector>
+
+#ifndef INCLUDED_SFX2_NOTEBOOKBAR_PRIORITYHBOX_HXX
+#define INCLUDED_SFX2_NOTEBOOKBAR_PRIORITYHBOX_HXX
+
+/*
+ * PriorityHBox is a VclHBox which hides its own children if there is no sufficient space.
+ * Hiding order can be modified using child's priorities. If a control have default
+ * priority assigned (VCL_PRIORITY_DEFAULT), it is always shown.
+ */
+
+class PriorityHBox : public VclHBox
+{
+private:
+    bool m_bInitialized;
+
+    std::vector<vcl::IPrioritable*> m_aSortedChildren;
+
+protected:
+    int GetHiddenCount() const;
+
+public:
+    explicit PriorityHBox(vcl::Window* pParent);
+
+    virtual ~PriorityHBox() override;
+
+    void Initialize();
+
+    void SetSizeFromParent();
+
+    virtual Size calculateRequisition() const override;
+
+    virtual void Resize() override;
+
+    virtual void Paint(vcl::RenderContext& rRenderContext, const tools::Rectangle& rRect) override;
+
+    void GetChildrenWithPriorities();
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */