27 lines
1023 B
Rust
27 lines
1023 B
Rust
use std::cell::RefCell;
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use std::rc::Rc;
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use dioxus_core::prelude::use_hook;
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use dioxus_core::prelude::Callback;
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/// Create a callback that's always up to date. Whenever this hook is called the inner callback will be replaced with the new callback but the handle will remain.
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///
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/// There is *currently* no signal tracking on the Callback so anything reading from it will not be updated.
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///
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/// This API is in flux and might not remain.
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#[doc = include_str!("../docs/rules_of_hooks.md")]
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pub fn use_callback<T: 'static, O: 'static>(f: impl FnMut(T) -> O + 'static) -> Callback<T, O> {
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let mut callback = Some(f);
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// Create a copyvalue with no contents
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// This copyvalue is generic over F so that it can be sized properly
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let mut inner = use_hook(|| Callback::new(callback.take().unwrap()));
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if let Some(callback) = callback.take() {
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// Every time this hook is called replace the inner callback with the new callback
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inner.__set(Rc::new(RefCell::new(callback)));
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}
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inner
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}
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