Struct NodeData 

pub struct NodeData<H> {

    pub kind: PieceKind,
    pub handle: Option<H>,
    pub parent: RNode,
    pub children: Vec<RNode>,
    pub layout: Rc<dyn Layout>,
    pub flex: Flex,
    pub scope: Scope,
    pub id: Option<String>,
    pub a11y: A11yProps,
    pub cache: Vec<((u64, u64), Size)>,
    pub probe: NodeProbe,
    pub needs_measure: bool,
    pub last_native_frame: Option<Rect>,
    pub is_boundary: bool,
    pub scroll_content: Option<Size>,
    pub implicit_anim: Option<AnimSpec>,
}

Fields

kind: PieceKind

handle: Option<H>

parent: RNode

children: Vec<RNode>

layout: Rc<dyn Layout>

flex: Flex

scope: Scope

id: Option<String>

a11y: A11yProps

Accumulated accessibility annotations (§13): merged from the piece default, .a11y(), and .id(). Stored so each set_a11y re-applies the full picture and a11y_audit (§14.2) can diff the native tree against Day’s own expectation.

cache: Vec<((u64, u64), Size)>

probe: NodeProbe

needs_measure: bool

last_native_frame: Option<Rect>

is_boundary: bool

scroll_content: Option<Size>

Scroll-content size reported by ScrollLayout (§7.6) — SCROLL nodes only. Cached so scroll_to_target can compose edge targets (bottom = content minus viewport).

implicit_anim: Option<AnimSpec>

Node-scoped implicit animation (.animation(anim), §8.4): when set, this node’s property patches and frame changes animate even outside a with_animation. The ambient animation (with_animation) takes precedence when both are present.