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diff --git a/include/svtools/calendar.hxx b/include/svtools/calendar.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_CALENDAR_HXX
+#define INCLUDED_SVTOOLS_CALENDAR_HXX
+
+#include <config_options.h>
+#include <svtools/svtdllapi.h>
+
+#include <vcl/calendar.hxx>
+#include <vcl/field.hxx>
+
+class MouseEvent;
+class TrackingEvent;
+class KeyEvent;
+class HelpEvent;
+class DataChangedEvent;
+class FloatingWindow;
+class PushButton;
+class ImplCFieldFloatWin;
+class Button;
+
+/*************************************************************************
+
+Description
+============
+
+class CalendarField
+
+This class is a DateField with which one can select a date via a DropDownButton
+and the CalendarControl.
+
+--------------------------------------------------------------------------
+
+WinBits
+
+See DateField
+
+The preferences for the CalendarControl can be set via SetCalendarStyle().
+
+--------------------------------------------------------------------------
+
+With EnableToday()/EnableNone() we can enable a TodayButton and a NoneButton.
+
+--------------------------------------------------------------------------
+
+Because we only take over the start date into the field, we should query
+with GetCalendar() in the SelectHandler and with GetSelectDateCount()/GetSelectDate()
+the selected range. We then can e.g. take over that value to another field.
+
+--------------------------------------------------------------------------
+
+If a derived Calendar should be used, we can override the CreateCalendar()
+method in CalendarField and create an own calendar there ourselves.
+
+*************************************************************************/
+
+
+class UNLESS_MERGELIBS(SVT_DLLPUBLIC) CalendarField final : public DateField
+{
+private:
+    VclPtr<ImplCFieldFloatWin> mpFloatWin;
+    VclPtr<Calendar>    mpCalendar;
+    VclPtr<PushButton>  mpTodayBtn;
+    VclPtr<PushButton>  mpNoneBtn;
+    bool                mbToday;
+    bool                mbNone;
+
+                        DECL_DLLPRIVATE_LINK( ImplSelectHdl, Calendar*, void );
+                        DECL_DLLPRIVATE_LINK( ImplClickHdl, Button*, void );
+                        DECL_DLLPRIVATE_LINK( ImplPopupModeEndHdl, FloatingWindow*, void );
+
+public:
+                        CalendarField( vcl::Window* pParent, WinBits nWinStyle );
+    virtual             ~CalendarField() override;
+    virtual void        dispose() override;
+
+    virtual bool        ShowDropDown( bool bShow ) override;
+    Calendar*           GetCalendar();
+
+    void                EnableToday() { mbToday = true; }
+    void                EnableNone() { mbNone = true; }
+
+private:
+    virtual void    StateChanged( StateChangedType nStateChange ) override;
+};
+
+#endif // INCLUDED_SVTOOLS_CALENDAR_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */