361 lines
12 KiB
Rust
361 lines
12 KiB
Rust
//! Useful, foundational hooks that 3rd parties can implement.
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//! Currently implemented:
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//! - [x] use_ref
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//! - [x] use_state
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//! - [ ] use_reducer
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//! - [ ] use_effect
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pub use new_use_state_def::use_state_new;
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pub use use_reducer_def::use_reducer;
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pub use use_ref_def::use_ref;
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pub use use_state_def::use_state;
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use crate::innerlude::Context;
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mod use_state_def {
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use crate::innerlude::*;
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use std::{
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cell::RefCell,
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ops::{Deref, DerefMut},
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rc::Rc,
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};
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/// Store state between component renders!
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/// When called, this hook retrives a stored value and provides a setter to update that value.
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/// When the setter is called, the component is re-ran with the new value.
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///
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/// This is behaves almost exactly the same way as React's "use_state".
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///
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/// Usage:
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/// ```ignore
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/// static Example: FC<()> = |ctx| {
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/// let (counter, set_counter) = use_state(&ctx, || 0);
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/// let increment = |_| set_couter(counter + 1);
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/// let decrement = |_| set_couter(counter + 1);
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///
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/// html! {
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/// <div>
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/// <h1>"Counter: {counter}" </h1>
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/// <button onclick={increment}> "Increment" </button>
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/// <button onclick={decrement}> "Decrement" </button>
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/// </div>
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/// }
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/// }
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/// ```
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pub fn use_state<'a, 'c, T: 'static, F: FnOnce() -> T>(
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ctx: &impl Scoped<'a>,
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initial_state_fn: F,
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) -> (&'a T, &'a Rc<dyn Fn(T)>) {
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struct UseState<T: 'static> {
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new_val: Rc<RefCell<Option<T>>>,
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current_val: T,
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caller: Rc<dyn Fn(T) + 'static>,
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}
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ctx.use_hook(
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move || UseState {
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new_val: Rc::new(RefCell::new(None)),
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current_val: initial_state_fn(),
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caller: Rc::new(|_| println!("setter called!")),
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},
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move |hook| {
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log::debug!("Use_state set called");
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let inner = hook.new_val.clone();
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let scheduled_update = ctx.schedule_update();
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// get ownership of the new val and replace the current with the new
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// -> as_ref -> borrow_mut -> deref_mut -> take
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// -> rc -> &RefCell -> RefMut -> &Option<T> -> T
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if let Some(new_val) = hook.new_val.as_ref().borrow_mut().deref_mut().take() {
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hook.current_val = new_val;
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}
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// todo: swap out the caller with a subscription call and an internal update
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hook.caller = Rc::new(move |new_val| {
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// update the setter with the new value
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let mut new_inner = inner.as_ref().borrow_mut();
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*new_inner = Some(new_val);
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// Ensure the component gets updated
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scheduled_update();
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});
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// box gets derefed into a ref which is then taken as ref with the hook
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(&hook.current_val, &hook.caller)
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},
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|_| {},
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)
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}
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}
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mod new_use_state_def {
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use crate::innerlude::*;
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use std::{
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cell::RefCell,
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fmt::{Debug, Display},
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ops::{Deref, DerefMut},
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pin::Pin,
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rc::Rc,
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};
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pub struct UseState<T: 'static> {
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modifier: Rc<RefCell<Option<Box<dyn FnOnce(&mut T)>>>>,
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current_val: T,
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update: Box<dyn Fn() + 'static>,
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setter: Box<dyn Fn(T) + 'static>,
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// setter: Box<dyn Fn(T) + 'static>,
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}
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// #[derive(Clone, Copy)]
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// pub struct UseStateHandle<'a, T: 'static> {
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// inner: &'a UseState<T>,
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// // pub setter: &'a dyn Fn(T),
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// // pub modifier: &'a dyn Fn(&mut T),
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// }
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impl<'a, T: 'static> UseState<T> {
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pub fn setter(&self) -> &dyn Fn(T) {
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&self.setter
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// let r = self.setter.as_mut();
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// unsafe { Pin::get_unchecked_mut(r) }
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}
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pub fn set(&self, new_val: T) {
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self.modify(|f| *f = new_val);
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}
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// signal that we need to be updated
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// save the modifier
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pub fn modify(&self, f: impl FnOnce(&mut T) + 'static) {
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let mut slot = self.modifier.as_ref().borrow_mut();
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*slot = Some(Box::new(f));
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(self.update)();
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}
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}
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impl<'a, T: 'static> std::ops::Deref for UseState<T> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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&self.current_val
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}
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}
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// enable displaty for the handle
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impl<'a, T: 'static + Display> std::fmt::Display for UseState<T> {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(f, "{}", self.current_val)
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}
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}
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/// Store state between component renders!
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/// When called, this hook retrives a stored value and provides a setter to update that value.
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/// When the setter is called, the component is re-ran with the new value.
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///
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/// This is behaves almost exactly the same way as React's "use_state".
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///
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/// Usage:
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/// ```ignore
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/// static Example: FC<()> = |ctx| {
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/// let (counter, set_counter) = use_state(&ctx, || 0);
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/// let increment = |_| set_couter(counter + 1);
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/// let decrement = |_| set_couter(counter + 1);
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///
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/// html! {
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/// <div>
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/// <h1>"Counter: {counter}" </h1>
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/// <button onclick={increment}> "Increment" </button>
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/// <button onclick={decrement}> "Decrement" </button>
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/// </div>
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/// }
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/// }
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/// ```
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pub fn use_state_new<'a, 'c, T: 'static, F: FnOnce() -> T>(
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ctx: &impl Scoped<'a>,
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initial_state_fn: F,
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) -> &'a UseState<T> {
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ctx.use_hook(
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move || UseState {
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modifier: Rc::new(RefCell::new(None)),
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current_val: initial_state_fn(),
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update: Box::new(|| {}),
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setter: Box::new(|_| {}),
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},
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move |hook| {
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log::debug!("addr of hook: {:#?}", hook as *const _);
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let scheduled_update = ctx.schedule_update();
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// log::debug!("Checking if new value {:#?}", &hook.current_val);
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// get ownership of the new val and replace the current with the new
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// -> as_ref -> borrow_mut -> deref_mut -> take
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// -> rc -> &RefCell -> RefMut -> &Option<T> -> T
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if let Some(new_val) = hook.modifier.as_ref().borrow_mut().deref_mut().take() {
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// log::debug!("setting prev {:#?}", &hook.current_val);
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(new_val)(&mut hook.current_val);
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// log::debug!("setting new value {:#?}", &hook.current_val);
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}
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hook.update = Box::new(move || scheduled_update());
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let modifier = hook.modifier.clone();
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hook.setter = Box::new(move |new_val: T| {
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let mut slot = modifier.as_ref().borrow_mut();
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let slot2 = slot.deref_mut();
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*slot2 = Some(Box::new(move |old: &mut T| *old = new_val));
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});
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&*hook
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},
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|_| {},
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)
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}
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}
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mod use_ref_def {
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use crate::innerlude::*;
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use std::{cell::RefCell, ops::DerefMut};
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// pub struct UseRef<T: 'static> {
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// _current: RefCell<T>,
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// }
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// impl<T: 'static> UseRef<T> {
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// fn new(val: T) -> Self {
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// Self {
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// _current: RefCell::new(val),
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// }
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// }
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// pub fn set(&self, new: T) {
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// let mut val = self._current.borrow_mut();
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// *val = new;
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// }
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// pub fn modify(&self, modifier: impl FnOnce(&mut T)) {
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// let mut val = self._current.borrow_mut();
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// let val_as_ref = val.deref_mut();
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// modifier(val_as_ref);
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// }
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// pub fn current(&self) -> std::cell::Ref<'_, T> {
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// self._current.borrow()
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// }
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// }
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/// Store a mutable value between renders!
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/// To read the value, borrow the ref.
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/// To change it, use modify.
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/// Modifications to this value do not cause updates to the component
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/// Attach to inner context reference, so context can be consumed
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pub fn use_ref<'a, T: 'static>(
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ctx: &impl Scoped<'a>,
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initial_state_fn: impl FnOnce() -> T + 'static,
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) -> &'a RefCell<T> {
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ctx.use_hook(|| RefCell::new(initial_state_fn()), |state| &*state, |_| {})
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}
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}
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mod use_reducer_def {
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use crate::innerlude::*;
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use std::{cell::RefCell, ops::DerefMut, rc::Rc};
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struct UseReducer<T: 'static, R: 'static> {
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new_val: Rc<RefCell<Option<T>>>,
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current_val: T,
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caller: Box<dyn Fn(R) + 'static>,
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}
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/// Store state between component renders!
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/// When called, this hook retrives a stored value and provides a setter to update that value.
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/// When the setter is called, the component is re-ran with the new value.
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///
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/// This is behaves almost exactly the same way as React's "use_state".
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///
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pub fn use_reducer<'a, 'c, State: 'static, Action: 'static>(
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ctx: &impl Scoped<'a>,
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initial_state_fn: impl FnOnce() -> State,
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_reducer: impl Fn(&mut State, Action),
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) -> (&'a State, &'a Box<dyn Fn(Action)>) {
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ctx.use_hook(
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move || UseReducer {
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new_val: Rc::new(RefCell::new(None)),
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current_val: initial_state_fn(),
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caller: Box::new(|_| println!("setter called!")),
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},
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move |hook| {
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let _inner = hook.new_val.clone();
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let scheduled_update = ctx.schedule_update();
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// get ownership of the new val and replace the current with the new
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// -> as_ref -> borrow_mut -> deref_mut -> take
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// -> rc -> &RefCell -> RefMut -> &Option<T> -> T
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if let Some(new_val) = hook.new_val.as_ref().borrow_mut().deref_mut().take() {
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hook.current_val = new_val;
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}
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// todo: swap out the caller with a subscription call and an internal update
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hook.caller = Box::new(move |_new_val| {
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// update the setter with the new value
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// let mut new_inner = inner.as_ref().borrow_mut();
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// *new_inner = Some(new_val);
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// Ensure the component gets updated
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scheduled_update();
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});
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// box gets derefed into a ref which is then taken as ref with the hook
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(&hook.current_val, &hook.caller)
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},
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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 crate::prelude::*;
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enum Actions {
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Incr,
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Decr,
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}
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// #[allow(unused)]
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// static Example: FC<()> = |ctx| {
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// let (count, reduce) = use_reducer(
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// &ctx,
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// || 0,
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// |count, action| match action {
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// Actions::Incr => *count += 1,
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// Actions::Decr => *count -= 1,
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// },
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// );
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// ctx.render(rsx! {
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// div {
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// h1 {"Count: {count}"}
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// button {
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// "Increment"
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// onclick: move |_| reduce(Actions::Incr)
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// }
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// button {
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// "Decrement"
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// onclick: move |_| reduce(Actions::Decr)
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// }
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// }
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// })
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// };
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}
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}
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pub fn use_is_initialized<P>(ctx: Context<P>) -> bool {
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let val = use_ref(&ctx, || false);
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match *val.borrow() {
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true => true,
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false => {
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//
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*val.borrow_mut() = true;
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false
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}
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}
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}
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