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#![cfg_attr(feature = "ssr", allow(unused_variables, unused_imports))]
use crate::sendwrap_fn;
use crate::utils::Pausable;
use default_struct_builder::DefaultBuilder;
use leptos::leptos_dom::helpers::IntervalHandle;
use leptos::prelude::*;
use send_wrapper::SendWrapper;
use std::cell::Cell;
use std::sync::Arc;
use std::time::Duration;
/// Wrapper for `set_interval` with controls.
///
/// ## Demo
///
/// [Link to Demo](https://github.com/Synphonyte/leptos-use/tree/main/examples/use_interval_fn)
///
/// ## Usage
///
/// ```
/// # use leptos::prelude::*;
/// # use leptos_use::use_interval_fn;
/// # use leptos_use::utils::Pausable;
/// #
/// # #[component]
/// # fn Demo() -> impl IntoView {
/// let Pausable { pause, resume, is_active } = use_interval_fn(
/// || {
/// // do something
/// },
/// 1000,
/// );
/// # view! { }
/// # }
/// ```
///
/// ## SendWrapped Return
///
/// The returned closures `pause` and `resume` are sendwrapped functions. They can
/// only be called from the same thread that called `use_interval_fn`.
///
/// ## Server-Side Rendering
///
/// On the server this function will simply be ignored.
pub fn use_interval_fn<CbFn, N>(
callback: CbFn,
interval: N,
) -> Pausable<impl Fn() + Clone + Send + Sync, impl Fn() + Clone + Send + Sync>
where
CbFn: Fn() + Clone + 'static,
N: Into<Signal<u64>>,
{
use_interval_fn_with_options(callback, interval, UseIntervalFnOptions::default())
}
/// Version of [`use_interval_fn`] that takes `UseIntervalFnOptions`. See [`use_interval_fn`] for how to use.
pub fn use_interval_fn_with_options<CbFn, N>(
callback: CbFn,
interval: N,
options: UseIntervalFnOptions,
) -> Pausable<impl Fn() + Clone + Send + Sync, impl Fn() + Clone + Send + Sync>
where
CbFn: Fn() + Clone + 'static,
N: Into<Signal<u64>>,
{
let UseIntervalFnOptions {
immediate,
immediate_callback,
} = options;
let timer: Arc<SendWrapper<Cell<Option<IntervalHandle>>>> =
Arc::new(SendWrapper::new(Cell::new(None)));
let (is_active, set_active) = signal(false);
let clean = {
let timer = Arc::clone(&timer);
move || {
if let Some(handle) = Cell::take(&timer) {
handle.clear();
}
}
};
let pause = {
let clean = clean.clone();
move || {
set_active.set(false);
clean();
}
};
let interval = interval.into();
let resume = sendwrap_fn!(move || {
#[cfg(not(feature = "ssr"))]
{
let interval_value = interval.get();
if interval_value == 0 {
return;
}
set_active.set(true);
let callback = {
let callback = callback.clone();
move || {
#[cfg(debug_assertions)]
let _z = leptos::reactive::diagnostics::SpecialNonReactiveZone::enter();
callback();
}
};
if immediate_callback {
callback.clone()();
}
clean();
timer.set(
set_interval_with_handle(callback.clone(), Duration::from_millis(interval_value))
.ok(),
);
}
});
if immediate {
resume();
}
{
#[allow(clippy::clone_on_copy)]
let resume = resume.clone();
let effect = Effect::watch(
move || interval.get(),
move |_, _, _| {
if is_active.get() {
resume();
}
},
false,
);
on_cleanup(move || effect.stop());
}
on_cleanup({
let pause = SendWrapper::new(pause.clone());
#[allow(clippy::redundant_closure)]
move || pause()
});
Pausable {
is_active: is_active.into(),
pause,
resume,
}
}
/// Options for [`use_interval_fn_with_options`]
#[derive(DefaultBuilder)]
pub struct UseIntervalFnOptions {
/// Start the timer immediately. Defaults to `true`.
pub immediate: bool,
/// Execute the callback immediate after calling this function. Defaults to `false`
pub immediate_callback: bool,
}
impl Default for UseIntervalFnOptions {
fn default() -> Self {
Self {
immediate: true,
immediate_callback: false,
}
}
}