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diff --git a/include/svtools/borderline.hxx b/include/svtools/borderline.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_SVTOOLS_BORDERLINE_HXX
+#define INCLUDED_SVTOOLS_BORDERLINE_HXX
+
+#include <svtools/svtdllapi.h>
+#include <o3tl/typed_flags_set.hxx>
+#include <memory>
+
+/**
+    Class computing border widths shared between Line style listbox and the
+    SvxBorderLine implementation.
+
+    This class doesn't know anything about units: it all depends on the different
+    values set. A border is composed of 2 lines separated by a gap. The computed
+    widths are the ones of each line and the gap and they can either be fix or vary.
+
+    The #m_nflags member will define which widths will vary (value 0 means that all
+    widths are fixed). The available flags are:
+     - CHANGE_LINE1
+     - CHANGE_LINE2
+     - CHANGE_DIST
+
+    For each line, the rate member is used as a multiplication factor is the width
+    isn't fixed. Otherwise it is the width in the unit expected by the client code.
+ */
+enum class BorderWidthImplFlags
+{
+    FIXED           = 0,
+    CHANGE_LINE1    = 1,
+    CHANGE_LINE2    = 2,
+    CHANGE_DIST     = 4,
+};
+namespace o3tl
+{
+    template<> struct typed_flags<BorderWidthImplFlags> : is_typed_flags<BorderWidthImplFlags, 0x07> {};
+}
+class SVT_DLLPUBLIC BorderWidthImpl
+{
+    BorderWidthImplFlags m_nFlags;
+    double m_nRate1;
+    double m_nRate2;
+    double m_nRateGap;
+
+public:
+
+    BorderWidthImpl( BorderWidthImplFlags nFlags = BorderWidthImplFlags::CHANGE_LINE1, double nRate1 = 0.0,
+            double nRate2 = 0.0, double nRateGap = 0.0 );
+
+    bool operator== ( const BorderWidthImpl& r ) const;
+
+    long GetLine1 ( long nWidth ) const;
+    long GetLine2( long nWidth ) const;
+    long GetGap( long nWidth ) const;
+
+    long GuessWidth( long nLine1, long nLine2, long nGap );
+
+    bool IsEmpty( ) const { return (0 == m_nRate1) && (0 == m_nRate2); }
+    bool IsDouble( ) const { return (0 != m_nRate1) && (0 != m_nRate2);  }
+};
+
+#endif // INCLUDED_SVTOOLS_BORDERLINE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */