Struct Claim 

pub struct Claim<'a, R: Reducer> { /* private fields */ }

A reducer being claimed, and what may still be said about it.

Produced by cx.state::<R>() during install. Ending the chain without driven_by is not a half-finished feature - it is state the UI owns outright, and the type says so: nothing drives it, so nothing can be emitted to it.

Implementations

impl<'a, R: Reducer> Claim<'a, R>

pub fn new( scope: Scope, bus: Option<&'a Rc<EventBus>>, token: &'a UiThreadToken, ) -> Self

For a context that hands features their scope - the contexts in guinea-app, and nothing else. bus is the window’s, when the scope is in one.

pub fn seed(self, state: R) -> Self

Starts from something other than R::default().

For a synchronous read - a setting already on disk - so the first frame shows real data instead of defaults followed by a round trip.

pub fn driven_by<A, F>(self, build: F) -> (Bound<R>, Addr<A>)

where F: FnOnce(Push<R>) -> A, A: ManagedActor + Serves + Debug + 'static,

Creates the actor that drives this reducer, and installs it here.

The closure is handed the Push rather than fetching it, and the actor’s lifetime becomes the scope’s - so a feature declares the whole edge in one expression and owns none of the bookkeeping. The actor type is inferred from what the closure returns; neither the reducer nor this call has to name it.

The address comes back for wiring that is the actor’s own, such as addr.subscribe_on::<M>(Bus::Global). The scope still owns the actor and disposes it, and what it subscribed to ends with it.

pub fn plain(self) -> Bound<R>

Leaves it for the feature to drive however it likes.

State the UI owns outright, or a domain that answers with something other than an actor - see cx.answers::<M>(..).