Leonard
c866ae602b
* Add `#[component]` attribute + system for creating component attributes + other stuff * Delete inlineprops.rs * Update inline_props.rs * Cargo fmt * Fix clippy warnings and paths in props/mods.rs * Include where clause in `#[inline_props]` output * Allow Clippy type complexity in `LinkProps` * Allow the type complexity lint for the entire link.rs file * Remove snake_case -> PascalCase converter, but rather enforce PascalCase Also: - Put the second function inside the main one instead of besides it. - Simplify * Simplify type check lints so they don't return false positives They will not always work, but they won't return any false positives, like for aliases. This is likely going to be replaced by a more polished Clippy-backed linting system. * Fix #583 * Cargo fmt * Add docs for `deserialize()` and remove useless comment * Add `#[component]` to prelude * Merge branch 'master' of https://github.com/tigerros/dioxus * #[inline_props] is no more. Except in the docs folder, but that's going to be removed * Remove docs folder * Remove docs from workspace * Resolve `DeserializerOutput` conversation
111 lines
2.7 KiB
Rust
111 lines
2.7 KiB
Rust
use dioxus_core::{ScopeState, TaskId};
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use std::{any::Any, cell::Cell, future::Future};
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use crate::UseFutureDep;
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/// A hook that provides a future that executes after the hooks have been applied
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///
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/// Whenever the hooks dependencies change, the future will be re-evaluated.
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/// If a future is pending when the dependencies change, the previous future
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/// will be allowed to continue
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///
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/// - dependencies: a tuple of references to values that are `PartialEq` + `Clone`
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///
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/// ## Examples
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///
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/// ```rust, no_run
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/// # use dioxus::prelude::*;
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/// #[component]
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/// fn Profile(cx: Scope, id: usize) -> Element {
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/// let name = use_state(cx, || None);
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///
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/// // Only fetch the user data when the id changes.
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/// use_effect(cx, (id,), |(id,)| {
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/// to_owned![name];
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/// async move {
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/// let user = fetch_user(id).await;
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/// name.set(user.name);
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/// }
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/// });
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///
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/// let name = name.get().clone().unwrap_or("Loading...".to_string());
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///
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/// render!(
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/// p { "{name}" }
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/// )
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/// }
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///
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/// #[component]
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/// fn App(cx: Scope) -> Element {
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/// render!(Profile { id: 0 })
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/// }
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/// ```
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pub fn use_effect<T, F, D>(cx: &ScopeState, dependencies: D, future: impl FnOnce(D::Out) -> F)
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where
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T: 'static,
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F: Future<Output = T> + 'static,
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D: UseFutureDep,
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{
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struct UseEffect {
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needs_regen: bool,
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task: Cell<Option<TaskId>>,
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dependencies: Vec<Box<dyn Any>>,
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}
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let state = cx.use_hook(move || UseEffect {
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needs_regen: true,
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task: Cell::new(None),
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dependencies: Vec::new(),
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});
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if dependencies.clone().apply(&mut state.dependencies) || state.needs_regen {
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// We don't need regen anymore
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state.needs_regen = false;
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// Create the new future
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let fut = future(dependencies.out());
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state.task.set(Some(cx.push_future(async move {
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fut.await;
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})));
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[allow(unused)]
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#[test]
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fn test_use_future() {
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use dioxus_core::prelude::*;
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struct MyProps {
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a: String,
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b: i32,
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c: i32,
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d: i32,
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e: i32,
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}
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fn app(cx: Scope<MyProps>) -> Element {
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// should only ever run once
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use_effect(cx, (), |_| async move {
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//
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});
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// runs when a is changed
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use_effect(cx, (&cx.props.a,), |(a,)| async move {
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//
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});
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// runs when a or b is changed
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use_effect(cx, (&cx.props.a, &cx.props.b), |(a, b)| async move {
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//
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});
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todo!()
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}
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}
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}
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