Struct Renderer 

pub struct Renderer<B: Toolkit> {
    pub kind: PieceKind,
    pub make: fn(&mut B, &dyn Any, NodeId) -> B::Handle,
    pub update: fn(&mut B, &B::Handle, &dyn Any),
    pub measure: Option<MeasureFn<B>>,
}

A third-party piece’s per-toolkit implementation. make receives the concrete backend (public helper surface) and returns a native handle the backend then owns like any built-in.

Fields

kind: PieceKind

make: fn(&mut B, &dyn Any, NodeId) -> B::Handle

update: fn(&mut B, &B::Handle, &dyn Any)

measure: Option<MeasureFn<B>>