Function BadgeClassMovePrevious

src/newgrf_badge_gui.cpp:403–425

* Move the badge class to the previous position. * @param feature Feature being used. * @param class_badge Class badge. */

 * @param class_badge Class badge.
 */
static void BadgeClassMovePrevious(GrfSpecFeature feature, Badge &class_badge)
{
	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 (pos_cur == std::begin(gui_classes.GetClasses())) {
		if (it->column > 0) --it->column;
		return;
	}

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

/**
 * Move the badge class to the next position.