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diff --git a/src/ui/widget/unit-menu.h b/src/ui/widget/unit-menu.h
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+++ b/src/ui/widget/unit-menu.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Author:
+ *   Bryce Harrington <bryce@bryceharrington.org>
+ *
+ * Copyright (C) 2004 Bryce Harrington
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef INKSCAPE_UI_WIDGET_UNIT_H
+#define INKSCAPE_UI_WIDGET_UNIT_H
+
+#include <gtkmm/comboboxtext.h>
+#include "util/units.h"
+
+using namespace Inkscape::Util;
+
+namespace Inkscape {
+namespace UI {
+namespace Widget {
+
+/**
+ * A drop down menu for choosing unit types.
+ */
+class UnitMenu : public Gtk::ComboBoxText
+{
+public:
+
+    /**
+     *    Construct a UnitMenu
+     */
+    UnitMenu();
+
+    ~UnitMenu() override;
+
+    /**
+     * Adds the unit type to the widget.  This extracts the corresponding
+     * units from the unit map matching the given type, and appends them
+     * to the dropdown widget.  It causes the primary unit for the given
+     * unit_type to be selected.
+     */
+    bool          setUnitType(UnitType unit_type);
+
+    /**
+     * Removes all unit entries, then adds the unit type to the widget.
+     * This extracts the corresponding
+     * units from the unit map matching the given type, and appends them
+     * to the dropdown widget.  It causes the primary unit for the given
+     * unit_type to be selected.
+     */
+    bool          resetUnitType(UnitType unit_type);
+
+    /**
+     * Adds a unit, possibly user-defined, to the menu.
+     */
+    void          addUnit(Unit const& u);
+
+    /**
+     * Sets the dropdown widget to the given unit abbreviation. 
+     * Returns true if the unit was selectable, false if not 
+     * (i.e., if the unit was not present in the widget).
+     */
+    bool          setUnit(Glib::ustring const &unit);
+
+    /**
+     * Returns the Unit object corresponding to the current selection
+     * in the dropdown widget.
+     */
+    Unit const *  getUnit() const;
+
+    /**
+     * Returns the abbreviated unit name of the selected unit.
+     */
+    Glib::ustring getUnitAbbr() const;
+
+    /**
+     * Returns the UnitType of the selected unit.
+     */
+    UnitType      getUnitType() const;
+
+    /**
+     * Returns the unit factor for the selected unit.
+     */
+    double        getUnitFactor() const;
+
+    /**
+     * Returns the recommended number of digits for displaying
+     *  numbers of this unit type.  
+     */
+    int           getDefaultDigits() const;
+
+    /**
+     * Returns the recommended step size in spin buttons
+     *  displaying units of this type.
+     */
+    double        getDefaultStep() const;
+
+    /**
+     * Returns the recommended page size (when hitting pgup/pgdn)
+     *  in spin buttons displaying units of this type.
+     */
+    double        getDefaultPage() const;
+
+    /**
+     *  Returns the conversion factor required to convert values
+     *  of the currently selected unit into units of type
+     *  new_unit_abbr.
+     */
+    double        getConversion(Glib::ustring const &new_unit_abbr, Glib::ustring const &old_unit_abbr = "no_unit") const;
+
+    /**
+     * Returns true if the selected unit is not dimensionless 
+     *  (false for %, true for px, pt, cm, etc).
+     */
+    bool          isAbsolute() const;
+
+    /**
+     * Returns true if the selected unit is radial (deg or rad).
+     */
+    bool          isRadial() const;
+
+protected:
+    UnitType          _type;
+    /**
+     * block scroll from widget if is inside a scrolled window.
+     */
+    bool on_scroll_event(GdkEventScroll *event) override;
+};
+
+} // namespace Widget
+} // namespace UI
+} // namespace Inkscape
+
+#endif // INKSCAPE_UI_WIDGET_UNIT_H
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :