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diff --git a/include/formula/formula.hxx b/include/formula/formula.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_FORMULA_FORMULA_HXX
+#define INCLUDED_FORMULA_FORMULA_HXX
+
+#include <memory>
+#include <utility>
+
+#include <formula/formuladllapi.h>
+#include <formula/IFunctionDescription.hxx>
+#include <o3tl/deleter.hxx>
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+#include <sfx2/basedlgs.hxx>
+#include <tools/gen.hxx>
+
+class NotifyEvent;
+class SfxBindings;
+class SfxChildWindow;
+
+namespace formula
+{
+
+#define STRUCT_END    1
+#define STRUCT_FOLDER 2
+#define STRUCT_ERROR  3
+
+enum class FormulaDlgMode { Formula, Edit };
+
+
+class FormulaDlg_Impl;
+class IControlReferenceHandler;
+class FormulaHelper;
+class RefEdit;
+class RefButton;
+class FormEditData;
+
+class FORMULA_DLLPUBLIC FormulaModalDialog
+    : public weld::GenericDialogController, public formula::IFormulaEditorHelper
+{
+    friend class FormulaDlg_Impl;
+public:
+    FormulaModalDialog(weld::Window* pParent, IFunctionManager const * _pFunctionMgr,
+                       IControlReferenceHandler* _pDlg);
+    virtual ~FormulaModalDialog() override;
+
+private:
+    std::unique_ptr<FormulaDlg_Impl, o3tl::default_delete<FormulaDlg_Impl>> m_pImpl;
+
+protected:
+
+    ::std::pair<RefButton*,RefEdit*> RefInputStartBefore( RefEdit* pEdit, RefButton* pButton );
+    void            RefInputStartAfter();
+    void            RefInputDoneAfter();
+
+    void            SetMeText(const OUString& _sText);
+    void            Update();
+    void            CheckMatrix(OUString& aFormula /*IN/OUT*/);
+    void            Update(const OUString& _sExp);
+
+    void            StoreFormEditData(FormEditData* pData);
+};
+
+class FORMULA_DLLPUBLIC FormulaDlg:
+    public SfxModelessDialogController, public IFormulaEditorHelper
+{
+    friend class FormulaDlg_Impl;
+public:
+    FormulaDlg(SfxBindings* pB, SfxChildWindow* pCW,
+               weld::Window* pParent,
+               IFunctionManager const * _pFunctionMgr,
+               IControlReferenceHandler* _pDlg);
+    virtual ~FormulaDlg() override;
+private:
+    std::unique_ptr<FormulaDlg_Impl, o3tl::default_delete<FormulaDlg_Impl>> m_pImpl;
+
+protected:
+    void            disableOk();
+
+protected:
+
+    ::std::pair<RefButton*,RefEdit*> RefInputStartBefore( RefEdit* pEdit, RefButton* pButton );
+    void            RefInputStartAfter();
+    void            RefInputDoneAfter( bool bForced );
+
+    void            SetMeText(const OUString& _sText);
+    FormulaDlgMode SetMeText(const OUString& _sText, sal_Int32 PrivStart, sal_Int32 PrivEnd, bool bMatrix, bool _bSelect, bool _bUpdate);
+    void            Update();
+    bool            CheckMatrix(OUString& aFormula /*IN/OUT*/);
+    OUString        GetMeText() const;
+    void            Update(const OUString& _sExp);
+    void            DoEnter();
+    const IFunctionDescription* getCurrentFunctionDescription() const;
+    bool            UpdateParaWin(Selection& _rSelection);
+    void            UpdateParaWin(const Selection& _rSelection, const OUString& _sRefStr);
+    RefEdit*    GetActiveEdit();
+    void            SetEdSelection();
+
+    void            StoreFormEditData(FormEditData* pData);
+
+    const FormulaHelper& GetFormulaHelper() const;
+};
+
+} // formula
+
+#endif // INCLUDED_FORMULA_FORMULA_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */