previous method

void previous()

Implementation

void previous() {
  final scope = _active;
  if (scope.order.isEmpty) return;
  final idx = scope.current == null ? 0 : scope.order.indexOf(scope.current!);
  final prevIdx = (idx - 1 + scope.order.length) % scope.order.length;
  scope.current = scope.order[prevIdx];
}