TreeRowMeta

Type-erased data source adapter for TreeView.

Wraps any TreeDataSource behind a uniform set of Rc<dyn Fn(..)> closures keyed on the visible flat index, so TreeView<T> requires no extra type parameter for the source's Key. Each closure resolves index → Key (via key_at) before forwarding to the source's parent, set_expanded, can_accept, etc. The Key type is fully captured here and never surfaces in the view.

Both built-in and external backings flow through Rc<TreeSlice<T>> (which implements TreeDataSource<Key = NodeId>), while TreeView::from_source wraps an external TreeDataSource with its own Key. The only built-in-vs-external difference — the NodeId-typed TreeRowContext handed to the legacy delegate — lives in tree_view.rs, not here.

Builder methods at a glance

toggle_callback

API reference

📖 Full rustdoc API for this module

pub struct TreeRowMeta

Key-erased per-row flat metadata, derived from the source's FlatEntry.

pub struct TreeRowMeta { /* fields */ }

pub struct TreeRow

Per-row context handed to a TreeView::from_source delegate — the key-erased counterpart of the built-in TreeRowContext. Carries the row's flat metadata plus a one-call chevron toggle that flips the row's expansion through the source (by index → key → set_expanded).

pub struct TreeRow { /* fields */ }

Methods

pub fn toggle_callback(&self) -> Rc<dyn Fn(&mut EventContext)>

Toggle callback for this row's chevron. Wires in one line: .on_toggle_rc(row.toggle_callback()).