Function BadgeClassMoveNext

src/newgrf_badge_gui.cpp:433–455

* Move the badge class to the next position. * @param feature Feature being used. * @param class_badge Class badge. * @param columns Maximum column number permitted. */

 * @param columns Maximum column number permitted.
 */
static void BadgeClassMoveNext(GrfSpecFeature feature, Badge &class_badge, uint columns)
{
	GUIBadgeClasses gui_classes(feature);
	if (gui_classes.GetClasses().empty()) return;

	auto config = GetBadgeClassConfiguration(feature);
	auto it = std::ranges::find(config, class_badge.label, &BadgeClassConfigItem::label);
	if (it == std::end(config)) return;

	auto pos_cur = std::ranges::find(gui_classes.GetClasses(), class_badge.class_index, &GUIBadgeClasses::Element::class_index);
	if (std::next(pos_cur) == std::end(gui_classes.GetClasses())) {
		if (it->column < columns - 1) ++it->column;
		return;
	}

	auto pos_next = std::ranges::find(config, std::next(pos_cur)->label, &BadgeClassConfigItem::label);
	if (it->column < pos_next->column) {
		++it->column;
	} else {
		/* Rotate elements left so that it is placed after pos_next, maintaining order of non-visible elements. */
		std::rotate(it, std::next(it), std::next(pos_next));
	}
}

/**
 * Handle the badge configuration drop down selection.