itemFactory method

TListItem<T, K> itemFactory(T data, { K? parentKey, List<K>? childrenKeys, int level = 0, })

The single canonical factory for creating a TListItem from raw data.

Accepts optional childrenKeys to override auto-resolution from itemChildren. When childrenKeys is not provided and itemChildren is set, children are resolved automatically.

Implementation

TListItem<T, K> itemFactory(
  T data, {
  K? parentKey,
  List<K>? childrenKeys,
  int level = 0,
}) {
  final resolvedChildrenKeys = childrenKeys ??
      (() {
        final children = itemChildren?.call(data);
        return children != null && children.isNotEmpty ? children.map(itemKey).toList() : null;
      })();

  return TListItem<T, K>(
    key: itemKey(data),
    data: data,
    parentKey: parentKey,
    childrenKeys: resolvedChildrenKeys,
    level: level,
  );
}