Module twist_arrow 

TwistArrow — a small chevron that indicates and toggles a tree node’s expansion.

Renders a right-pointing arrow when collapsed and a down-pointing arrow when expanded; a leaf node (where has_children is false) paints nothing but reserves its slot so the indent column stays aligned across all rows. The glyph flips direction under right-to-left layout. Accessibility-decorative: the chevron hides itself from the AT tree and the parent row’s node owns set_expanded.

// TwistArrow is typically instantiated by TreeView row delegates and requires
// an EventContext to wire the tap callback. The snippet below shows the
// construction pattern used inside a custom tree-row build().
let arrow = TwistArrow::new(16.0, true, false)
    .on_click(|ctx| ctx.send_intent(teksilo_core::Intent::new("tree.toggle")));

Touch and pen

A 12 dp chevron is half the 24 dp target floor and cannot grow — the indent column is the tree’s own geometry. It declares a Widget::hit_outset instead, which is the one mechanism that can win here: the chevron’s neighbour is the row, the row takes presses, and a point inside the row is at distance zero from it, so the miss-only slop pass could never reach the chevron. Zero for a leaf chevron and for a decorative one, which take no press.

Structs

TwistArrow

Small interactive chevron rendered in the leading indent column of a tree row.