Trait yewdux::store::Reducer

pub trait Reducer<S> {
    // Required method
    fn apply(self, state: Rc<S>) -> Rc<S>;
}

A type that can change state.

use std::rc::Rc;

use yew::prelude::*;
use yewdux::prelude::*;

#[derive(Default, Clone, PartialEq, Eq, Store)]
struct Counter {
    count: u32,
}

enum Msg {
    AddOne,
}

impl Reducer<Counter> for Msg {
    fn apply(self, mut counter: Rc<Counter>) -> Rc<Counter> {
        let state = Rc::make_mut(&mut counter);
        match self {
            Msg::AddOne => state.count += 1,
        };

        counter
    }
}

#[function_component]
fn App() -> Html {
    let (counter, dispatch) = use_store::<Counter>();
    let onclick = dispatch.apply_callback(|_| Msg::AddOne);

    html! {
        <>
        <p>{ counter.count }</p>
        <button {onclick}>{"+1"}</button>
        </>
    }
}

Required Methods

fn apply(self, state: Rc<S>) -> Rc<S>

Mutate state.

Implementors

impl<F, S> Reducer<S> for F

where F: FnOnce(Rc<S>) -> Rc<S>,