21 lines
923 B
Rust
21 lines
923 B
Rust
use dioxus_core::{use_after_render, use_before_render, use_hook};
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use dioxus_signals::{CopyValue, WritableExt};
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/// A utility lifecycle hook that is intended to be used inside other hooks to determine if the outer hook has ran this render.
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/// The provided callback is executed after each render.
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/// The value will only be true if the containing outer hook is executed.
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#[doc = include_str!("../docs/rules_of_hooks.md")]
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#[doc = include_str!("../docs/moving_state_around.md")]
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pub fn use_hook_did_run(mut handler: impl FnMut(bool) + 'static) {
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let mut did_run_ = use_hook(|| CopyValue::new(false));
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// Before render always set the value to false
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use_before_render(move || did_run_.set(false));
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// Only when the outer hook is run do we want to set the value to true
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did_run_.set(true);
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// After render, we can check if the outer hook was run
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use_after_render(move || handler(did_run_()));
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}
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