sliver_tree/_node_store library

Internal: structural-component storage for TreeController.

Owns the nid registry plus every dense per-nid array that describes the tree's structure (parent, children, depth, expansion, ancestors-expanded). Pure data: no animation state, no visibility/order state, no notifications. Visibility-related per-nid arrays (_visibleSubtreeSizeByNid, the order buffer's reverse index) live on the controller because they describe which nodes are currently rendered, not the structure itself.

Classes

NodeStore<TKey, TData>

Dense ECS-style storage for the tree's structural state.

Constants

kNoParentNid → const int

Sentinel value in nid-indexed parent arrays meaning "no parent" (root node) or "slot is free". Same sentinel is safe for both because a freed nid is never queried through NodeStore.nids.