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diff --git a/include/editeng/overflowingtxt.hxx b/include/editeng/overflowingtxt.hxx
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+++ b/include/editeng/overflowingtxt.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_EDITENG_OVERFLOWINGTXT_HXX
+#define INCLUDED_EDITENG_OVERFLOWINGTXT_HXX
+
+#include <editeng/editengdllapi.h>
+#include <editeng/editdata.hxx>
+
+#include <com/sun/star/uno/Reference.h>
+#include <optional>
+
+namespace com::sun::star {
+  namespace datatransfer { class XTransferable; }
+}
+
+class OutlinerParaObject;
+class Outliner;
+
+
+/*
+ * A collection of static methods for attaching text.
+ * Strongly coupled with some of the classes in this file.
+ */
+class TextChainingUtils
+{
+public:
+    static css::uno::Reference< css::datatransfer::XTransferable> CreateTransferableFromText(Outliner const *);
+
+    static std::optional<OutlinerParaObject> JuxtaposeParaObject(
+            css::uno::Reference< css::datatransfer::XTransferable > const & xOverflowingContent,
+            Outliner *,
+            OutlinerParaObject const *);
+    static std::optional<OutlinerParaObject> DeeplyMergeParaObject(
+            css::uno::Reference< css::datatransfer::XTransferable > const & xOverflowingContent,
+            Outliner *,
+            OutlinerParaObject const *);
+};
+
+/*
+ * The classes OverflowingText and NonOverflowingText handle the
+ * actual preparation of the OutlinerParaObjects to be used in destination
+ * and source box respectively.
+*/
+
+class OverflowingText
+{
+public:
+    OverflowingText(css::uno::Reference< css::datatransfer::XTransferable > xOverflowingContent);
+
+    std::optional<OutlinerParaObject> JuxtaposeParaObject(Outliner *, OutlinerParaObject const *);
+    std::optional<OutlinerParaObject> DeeplyMergeParaObject(Outliner *, OutlinerParaObject const *);
+
+private:
+    css::uno::Reference< css::datatransfer::XTransferable > mxOverflowingContent;
+};
+
+class NonOverflowingText
+{
+public:
+    NonOverflowingText(const ESelection &aSel, bool bLastParaInterrupted);
+
+    std::optional<OutlinerParaObject> RemoveOverflowingText(Outliner *) const;
+    ESelection GetOverflowPointSel() const;
+    bool IsLastParaInterrupted() const;
+
+private:
+    ESelection maContentSel;
+    bool mbLastParaInterrupted;
+};
+
+
+/*
+ * classes OFlowChainedText and UFlowChainedText:
+ * contain and handle the state of a broken up text _after_ a flow event
+ * (respectively after Overflow and Underflow).
+ *
+ */
+class EDITENG_DLLPUBLIC OFlowChainedText
+{
+public:
+    OFlowChainedText(Outliner const *, bool );
+    ~OFlowChainedText();
+
+    std::optional<OutlinerParaObject> InsertOverflowingText(Outliner *, OutlinerParaObject const *);
+    std::optional<OutlinerParaObject> RemoveOverflowingText(Outliner *);
+
+    ESelection GetOverflowPointSel() const;
+
+    bool IsLastParaInterrupted() const;
+
+private:
+    std::optional<NonOverflowingText> mpNonOverflowingTxt;
+    std::optional<OverflowingText> mpOverflowingTxt;
+
+    bool mbIsDeepMerge;
+};
+
+// UFlowChainedText is a simpler class than OFlowChainedText: it almost only joins para-objects
+class EDITENG_DLLPUBLIC UFlowChainedText
+{
+public:
+    UFlowChainedText(Outliner const *, bool);
+    std::optional<OutlinerParaObject> CreateMergedUnderflowParaObject(Outliner *, OutlinerParaObject const *);
+
+private:
+    css::uno::Reference< css::datatransfer::XTransferable > mxUnderflowingTxt;
+
+    bool mbIsDeepMerge;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */