itemCount method

int itemCount(
  1. K sectionKey
)

Number of items currently belonging to sectionKey, regardless of expansion state. Returns 0 for unknown sections. Includes pending-deletion children — this is the count rendered by the header, since exit animations are still visible.

Implementation

int itemCount(K sectionKey) {
  _checkNotDisposed();
  return _tree.getChildCount(SectionKey<K>(sectionKey));
}