TreeEnumeratorStyleFunc typedef

Callback for per-item enumerator (branch character) styling in trees.

children is the list of sibling items at the current level. index is the index of the current item being rendered.

Return a Style to apply to the enumerator, or null for no styling.

Example:

tree.enumeratorStyleFunc((children, index) {
  if (index == selectedIndex) {
    return Style().foreground(Colors.green);
  }
  return Style().foreground(Colors.dim);
});