Struct TreeRow 

pub struct TreeRow {
    pub depth: usize,
    pub has_children: bool,
    pub is_expanded: bool,
    /* private fields */
}

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).

Fields

depth: usize

Depth in the tree (0 for roots).

has_children: bool

Whether this row has children in the source.

is_expanded: bool

Whether this row is currently expanded.

Implementations

impl TreeRow

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()).