addItem method

void addItem(Item item, { required K toSection, int? index, bool animate = true, })

Inserts item under toSection at index (or at the end).

Implementation

void addItem(
  Item item, {
  required K toSection,
  int? index,
  bool animate = true,
}) {
  _checkNotDisposed();
  _requireSection(toSection, "addItem");
  // Scoped to OTHER sections: re-adding into `toSection` is either the
  // cancel-deletion path for a mid-exit item or an in-section upsert,
  // both of which `insert` handles.
  _requireItemsFree(
    [itemKeyOf(item)],
    "addItem",
    exceptInSection: toSection,
  );
  _tree.insert(
    parentKey: SectionKey<K>(toSection),
    node: TreeNode(
      key: ItemKey<K>(itemKeyOf(item)),
      data: ItemPayload<Section, Item>(item),
    ),
    index: index,
    animate: animate,
  );
}