1 files changed, 152 insertions, 0 deletions
diff --git a/src/ui/widget/unit-menu.cpp b/src/ui/widget/unit-menu.cpp
new file mode 100644
index 0000000..aaf565f
--- /dev/null
+++ b/src/ui/widget/unit-menu.cpp
@@ -0,0 +1,152 @@
+// 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.
+ */
+
+#include <cmath>
+
+#include "unit-menu.h"
+
+using Inkscape::Util::unit_table;
+
+namespace Inkscape {
+namespace UI {
+namespace Widget {
+
+UnitMenu::UnitMenu() : _type(UNIT_TYPE_NONE)
+{
+    set_active(0);
+    gtk_widget_add_events(GTK_WIDGET(gobj()), GDK_SCROLL_MASK | GDK_SMOOTH_SCROLL_MASK);
+    signal_scroll_event().connect(sigc::mem_fun(*this, &UnitMenu::on_scroll_event));
+}
+
+UnitMenu::~UnitMenu() = default;
+
+bool UnitMenu::setUnitType(UnitType unit_type) 
+{
+    // Expand the unit widget with unit entries from the unit table
+    UnitTable::UnitMap m = unit_table.units(unit_type);
+
+    for (auto & i : m) {
+        append(i.first);
+    }
+    _type = unit_type;
+    set_active_text(unit_table.primary(unit_type));
+
+    return true;
+}
+
+bool UnitMenu::resetUnitType(UnitType unit_type) 
+{
+    remove_all();
+
+    return setUnitType(unit_type);
+}
+
+void UnitMenu::addUnit(Unit const& u)
+{
+    unit_table.addUnit(u, false);
+    append(u.abbr);
+}
+
+Unit const * UnitMenu::getUnit() const
+{
+    if (get_active_text() == "") {
+        g_assert(_type != UNIT_TYPE_NONE);
+        return unit_table.getUnit(unit_table.primary(_type));
+    }
+    return unit_table.getUnit(get_active_text());
+}
+
+bool UnitMenu::setUnit(Glib::ustring const & unit)
+{
+    // TODO:  Determine if 'unit' is available in the dropdown.
+    //        If not, return false
+
+    set_active_text(unit);
+    return true;
+}
+
+Glib::ustring UnitMenu::getUnitAbbr() const
+{
+    if (get_active_text() == "") {
+        return "";
+    }
+    return getUnit()->abbr;
+}
+
+UnitType UnitMenu::getUnitType() const
+{
+    return getUnit()->type;
+}
+
+double  UnitMenu::getUnitFactor() const
+{
+    return getUnit()->factor;
+}
+
+int UnitMenu::getDefaultDigits() const
+{
+    return getUnit()->defaultDigits();
+}
+
+double UnitMenu::getDefaultStep() const
+{ 
+    int factor_digits = -1*int(log10(getUnit()->factor));
+    return pow(10.0, factor_digits);
+}
+
+double UnitMenu::getDefaultPage() const
+{
+    return 10 * getDefaultStep();
+}
+
+double UnitMenu::getConversion(Glib::ustring const &new_unit_abbr, Glib::ustring const &old_unit_abbr) const
+{
+    double old_factor = getUnit()->factor;
+    if (old_unit_abbr != "no_unit") {
+        old_factor = unit_table.getUnit(old_unit_abbr)->factor;
+    }
+    Unit const * new_unit = unit_table.getUnit(new_unit_abbr);
+
+    // Catch the case of zero or negative unit factors (error!)
+    if (old_factor < 0.0000001 ||
+        new_unit->factor < 0.0000001) {
+        // TODO:  Should we assert here?
+        return 0.00;
+    }
+
+    return old_factor / new_unit->factor;
+}
+
+bool UnitMenu::isAbsolute() const
+{
+    return getUnitType() != UNIT_TYPE_DIMENSIONLESS;
+}
+
+bool UnitMenu::isRadial() const
+{
+    return getUnitType() == UNIT_TYPE_RADIAL;
+}
+
+bool UnitMenu::on_scroll_event(GdkEventScroll *event) { return false; }
+
+} // namespace Widget
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  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 :