Type Alias Handler 

pub type Handler = Arc<dyn Fn() + Send + Sync>;

A nullary event handler (e.g. Button::on_press). Handlers travel through a hole wrapped as this type — concrete (so it round-trips through Box<dyn Any>), and callable. Arg-taking handlers (Fn(T)) are a future extension.

Aliased Type

pub struct Handler { /* private fields */ }

Trait Implementations

impl FromProp for Handler

A handler is always a hole (a closure can’t be a literal). The compiled binary wraps it as Handler and puts it in the hole array; here we downcast it back.

const TYPE_NAME: &'static str = "handler"

The name shown in a InflateError::PropType when extraction fails.

fn from_prop( pi: &PropInput<'_>, widget: &str, prop: &str, ) -> Result<Self, InflateError>