104 lines
2.8 KiB
Rust
104 lines
2.8 KiB
Rust
#![allow(missing_docs)]
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use dioxus_core::{
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prelude::{spawn, use_hook},
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ScopeState, Task,
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};
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use dioxus_signals::*;
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use futures_util::{future, pin_mut, FutureExt};
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use std::{any::Any, cell::Cell, future::Future, pin::Pin, rc::Rc, sync::Arc, task::Poll};
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/// A hook that allows you to spawn a future
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///
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/// Does not regenerate the future when dependencies change. If you're looking for a future that does, check out
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/// `use_resource` instead.
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pub fn use_future<F>(mut future: impl FnMut() -> F) -> UseFuture
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where
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F: Future + 'static,
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{
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let mut state = use_signal(|| UseFutureState::Pending);
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let task = use_signal(|| {
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// Create the user's task
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let fut = future();
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// Spawn a wrapper task that polls the innner future and watch its dependencies
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let task = spawn(async move {
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// move the future here and pin it so we can poll it
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let fut = fut;
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pin_mut!(fut);
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let res = future::poll_fn(|cx| {
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// Set the effect stack properly
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// Poll the inner future
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let ready = fut.poll_unpin(cx);
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// add any dependencies to the effect stack that we need to watch when restarting the future
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ready
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})
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.await;
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// Set the value
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// value.set(Some(res));
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});
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Some(task)
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});
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UseFuture { task, state }
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}
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pub struct UseFuture {
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task: Signal<Option<Task>>,
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state: Signal<UseFutureState>,
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}
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impl UseFuture {
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/// Restart the future with new dependencies.
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///
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/// Will not cancel the previous future, but will ignore any values that it
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/// generates.
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pub fn restart(&self) {
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// self.needs_regen.set(true);
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// (self.update)();
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}
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/// Forcefully cancel a future
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pub fn cancel(&self) {
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// if let Some(task) = self.task.take() {
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// cx.remove_future(task);
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// }
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}
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/// Get the ID of the future in Dioxus' internal scheduler
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pub fn task(&self) -> Option<Task> {
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todo!()
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// self.task.get()
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}
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/// Get the current state of the future.
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pub fn state(&self) -> UseFutureState {
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todo!()
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// match (&self.task.get(), &self.value()) {
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// // If we have a task and an existing value, we're reloading
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// (Some(_), Some(val)) => UseFutureState::Reloading(val),
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// // no task, but value - we're done
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// (None, Some(val)) => UseFutureState::Complete(val),
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// // no task, no value - something's wrong? return pending
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// (None, None) => UseFutureState::Pending,
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// // Task, no value - we're still pending
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// (Some(_), None) => UseFutureState::Pending,
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// }
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}
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}
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pub enum UseFutureState {
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Pending,
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Complete,
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Regenerating, // the old value
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}
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