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diff --git a/svx/source/inc/fmexch.hxx b/svx/source/inc/fmexch.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_SVX_SOURCE_INC_FMEXCH_HXX
+#define INCLUDED_SVX_SOURCE_INC_FMEXCH_HXX
+
+#include <config_options.h>
+#include <sal/config.h>
+
+#include <set>
+
+#include <sot/exchange.hxx>
+#include <vcl/transfer.hxx>
+#include <com/sun/star/uno/Sequence.hxx>
+#include <com/sun/star/form/XForms.hpp>
+#include <rtl/ref.hxx>
+#include <tools/link.hxx>
+#include <vcl/weld.hxx>
+#include <svx/svxdllapi.h>
+
+namespace svxform
+{
+    typedef ::std::set<std::unique_ptr<weld::TreeIter>> ListBoxEntrySet;
+
+    //= OLocalExchange
+    class UNLESS_MERGELIBS(SVXCORE_DLLPUBLIC) OLocalExchange : public TransferDataContainer
+    {
+    private:
+        Link<OLocalExchange&,void>  m_aClipboardListener;
+        bool            m_bDragging         : 1;
+        bool            m_bClipboardOwner   : 1;
+
+    public:
+        class GrantAccess
+        {
+            friend class OLocalExchangeHelper;
+        };
+
+    public:
+        OLocalExchange( );
+
+        bool        isDragging() const { return m_bDragging; }
+        bool        isClipboardOwner() const { return m_bClipboardOwner; }
+
+        void        setDragging(bool bDragging);
+        SVXCORE_DLLPRIVATE void copyToClipboard(const weld::Widget& rWidget, const GrantAccess&);
+
+        void        setClipboardListener( const Link<OLocalExchange&,void>& _rListener ) { m_aClipboardListener = _rListener; }
+
+        SVXCORE_DLLPRIVATE void clear();
+
+        static  bool    hasFormat( const DataFlavorExVector& _rFormats, SotClipboardFormatId _nFormatId );
+
+    protected:
+        // XClipboardOwner
+        virtual void SAL_CALL lostOwnership( const css::uno::Reference< css::datatransfer::clipboard::XClipboard >& _rxClipboard, const css::uno::Reference< css::datatransfer::XTransferable >& _rxTrans ) override;
+
+        // TransferableHelper
+        virtual void        DragFinished( sal_Int8 nDropAction ) override;
+        virtual bool GetData( const css::datatransfer::DataFlavor& rFlavor, const OUString& rDestDoc ) override;
+
+    private:
+         // don't allow this base class method to be called from outside
+        using TransferDataContainer::StartDrag;
+    };
+
+
+    //= OLocalExchangeHelper
+
+    /// a helper for navigator windows (SvTreeListBox'es) which allow DnD within themself
+    class UNLESS_MERGELIBS(SVXCORE_DLLPUBLIC) OLocalExchangeHelper
+    {
+    protected:
+        rtl::Reference<OLocalExchange> m_xTransferable;
+
+    public:
+        OLocalExchangeHelper();
+        virtual ~OLocalExchangeHelper();
+
+        void        prepareDrag( );
+
+        SVXCORE_DLLPRIVATE void copyToClipboard(const weld::Widget& rWidget) const;
+
+        bool    isDragSource() const { return m_xTransferable.is() && m_xTransferable->isDragging(); }
+        bool    isClipboardOwner() const { return m_xTransferable.is() && m_xTransferable->isClipboardOwner(); }
+        bool    isDataExchangeActive( ) const { return isDragSource() || isClipboardOwner(); }
+        void        clear() { if ( isDataExchangeActive() ) m_xTransferable->clear(); }
+
+        SVX_DLLPRIVATE void     setClipboardListener( const Link<OLocalExchange&,void>& _rListener ) { if ( m_xTransferable.is() ) m_xTransferable->setClipboardListener( _rListener ); }
+
+    protected:
+        SVX_DLLPRIVATE virtual rtl::Reference<OLocalExchange> createExchange() const = 0;
+
+    protected:
+        SVX_DLLPRIVATE void implReset();
+    };
+
+    class OControlTransferData
+    {
+    private:
+        DataFlavorExVector  m_aCurrentFormats;
+
+    protected:
+        ListBoxEntrySet     m_aSelectedEntries;
+        css::uno::Sequence< css::uno::Sequence< sal_uInt32 > >
+                            m_aControlPaths;
+        css::uno::Sequence< css::uno::Reference< css::uno::XInterface > >
+                            m_aHiddenControlModels;
+
+        css::uno::Reference< css::form::XForms >
+                            m_xFormsRoot;       // the root of the forms collection where the entries we represent reside
+                                                // this uniquely identifies the page and the document
+
+        bool        m_bFocusEntry;
+
+    protected:
+        // updates m_aCurrentFormats with all formats we currently could supply
+        void    updateFormats( );
+
+    public:
+        OControlTransferData( );
+
+        // ctor to construct the data from an arbitrary Transferable (usually clipboard data)
+        OControlTransferData(
+            const css::uno::Reference< css::datatransfer::XTransferable >& _rxTransferable
+        );
+
+        inline const DataFlavorExVector&    GetDataFlavorExVector() const;
+
+        void addSelectedEntry(std::unique_ptr<weld::TreeIter> xEntry);
+        void setFocusEntry(bool _bFocusEntry);
+
+        /** notifies the data transfer object that a certain entry has been removed from the owning tree
+
+            In case the removed entry is part of the transfer object's selection, the entry is removed from
+            the selection.
+
+            @param  _pEntry
+            @return the number of entries remaining in the selection.
+        */
+        size_t  onEntryRemoved(const weld::TreeView* pView, const weld::TreeIter* _pEntry);
+
+        void setFormsRoot(
+            const css::uno::Reference< css::form::XForms >& _rxFormsRoot
+            ) { m_xFormsRoot = _rxFormsRoot; }
+
+        void buildPathFormat(const weld::TreeView* pTreeBox, const weld::TreeIter* pRoot);
+            // assembles m_aControlPaths from m_aSelectedEntries
+            // (it is assumed that the entries are sorted in m_aSelectedEntries with respect to the neighbor relationship)
+
+
+        void buildListFromPath(const weld::TreeView* pTreeBox, const weld::TreeIter* pRoot);
+            // The reverse way: throws everything out of m_aSelectedEntries and rebuilds it using m_aControlPaths
+
+        void addHiddenControlsFormat(const css::uno::Sequence< css::uno::Reference< css::uno::XInterface > >& seqInterfaces);
+            // adds an SVX_FML_HIDDEN_CONTROLS format and remembers the passed interfaces for it
+            // (it is NOT checked whether actually only hidden controls are denominated
+            // by this - the caller must ensure that)
+
+        const ListBoxEntrySet&      selected() const { return m_aSelectedEntries; }
+        const css::uno::Sequence< css::uno::Reference< css::uno::XInterface > >&
+                                    hiddenControls() const { return m_aHiddenControlModels; }
+
+        const css::uno::Reference< css::form::XForms >&
+                                getFormsRoot() const { return m_xFormsRoot; }
+    };
+
+
+    inline const DataFlavorExVector& OControlTransferData::GetDataFlavorExVector() const
+    {
+        const_cast< OControlTransferData* >( this )->updateFormats( );
+        return m_aCurrentFormats;
+    }
+
+    class OControlExchange final : public OLocalExchange, public OControlTransferData
+    {
+    public:
+        OControlExchange( );
+
+    public:
+        static SotClipboardFormatId getFieldExchangeFormatId( );
+        static SotClipboardFormatId getControlPathFormatId( );
+        static SotClipboardFormatId getHiddenControlModelsFormatId( );
+
+        inline static bool  hasFieldExchangeFormat( const DataFlavorExVector& _rFormats );
+        inline static bool  hasControlPathFormat( const DataFlavorExVector& _rFormats );
+        inline static bool  hasHiddenControlModelsFormat( const DataFlavorExVector& _rFormats );
+
+    private:
+        virtual bool GetData( const css::datatransfer::DataFlavor& rFlavor, const OUString& rDestDoc ) override;
+        virtual void        AddSupportedFormats() override;
+    };
+
+    class OControlExchangeHelper final : public OLocalExchangeHelper
+    {
+    public:
+        OControlExchangeHelper() : OLocalExchangeHelper() { }
+
+        OControlExchange* operator->() const { return static_cast< OControlExchange* >( m_xTransferable.get() ); }
+        OControlExchange& operator*() const { return *static_cast< OControlExchange* >( m_xTransferable.get() ); }
+
+    private:
+        virtual rtl::Reference<OLocalExchange> createExchange() const override;
+    };
+
+
+    inline bool OControlExchange::hasFieldExchangeFormat( const DataFlavorExVector& _rFormats )
+    {
+        return hasFormat( _rFormats, getFieldExchangeFormatId() );
+    }
+
+    inline bool OControlExchange::hasControlPathFormat( const DataFlavorExVector& _rFormats )
+    {
+        return hasFormat( _rFormats, getControlPathFormatId() );
+    }
+
+    inline bool OControlExchange::hasHiddenControlModelsFormat( const DataFlavorExVector& _rFormats )
+    {
+        return hasFormat( _rFormats, getHiddenControlModelsFormatId() );
+    }
+
+
+}
+
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */