dioxus-use-computed 🦀🧠

内置的 Dioxus 钩子 use_memo 和 use_reactive 的替代品。

主要思想是以尽可能高效的方式执行资源密集型计算。避免不必要的重渲染和包装。

fn app() -> Element {
    let mut value = use_signal(|| 2);

    rsx!(
        Counter {
            value: value()
        }
        PrevCounter {
            value: value()
        }
        CounterSignal {
            value: value()
        }
        PrevCounterSignal {
            value: value()
        }
    )
}

#[component]
fn Counter(value: usize) -> Element {
    let double = use_computed(value, || value * 2);

    rsx!( p {  "Double: {double}" } )
}

#[component]
fn PrevCounter(value: usize) -> Element {
    let double = use_computed_with_prev(value, |prev_value| prev_value.unwrap_or(value) * 2);

    rsx!( p { "Previous Double: {double}" } )
}

#[component]
fn CounterSignal(value: usize) -> Element {
    let double = use_computed_signal(value, || value * 2);

    rsx!( p { "Double Signal: {double}" } )
}

#[component]
fn PrevCounterSignal(value: usize) -> Element {
    let double = use_computed_signal_with_prev(value, |prev| prev.cloned().unwrap_or(value) * 2);

    rsx!( p { "Previous Double Signal: {double}" } )
}