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use web_sys::Element;
use yew::prelude::*;
use super::{use_debounce, use_event, use_latest};
/// A sensor hook that tracks infinite scrolling of the element.
///
/// # Example
///
/// ```rust
/// # use yew::prelude::*;
/// #
/// use yew_hooks::prelude::*;
///
/// #[function_component(UseInfiniteScroll)]
/// fn infinite_scroll() -> Html {
/// let node = use_node_ref();
/// let state = use_list(vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
///
/// {
/// let state = state.clone();
/// use_infinite_scroll(node.clone(), move || {
/// let max = state.current().len() + 1;
/// let mut more = vec![max, max + 1, max + 2, max + 3, max + 4];
/// state.append(&mut more);
/// });
/// }
///
/// html! {
/// <div ref={node}>
/// {
/// for state.current().iter().map(|element| {
/// html! { <p>{ *element }</p> }
/// })
/// }
/// </div>
/// }
/// }
/// ```
#[hook]
pub fn use_infinite_scroll<Callback>(node: NodeRef, callback: Callback)
where
Callback: Fn() + 'static,
{
let callback_ref = use_latest(callback);
let load_more = use_state_eq(|| false);
{
let load_more = load_more.clone();
use_effect_with(load_more, move |load_more| {
if **load_more {
let callback = &*callback_ref.current();
callback();
}
|| ()
});
}
let debounce = {
let load_more = load_more.clone();
use_debounce(
move || {
load_more.set(false);
},
100,
)
};
use_event(node, "scroll", move |e: Event| {
let element: Element = e.target_unchecked_into();
#[allow(clippy::unnecessary_cast)]
if (element.scroll_height() as f64) - (element.scroll_top() as f64)
<= (element.client_height() as f64) + 100.0
{
load_more.set(true);
debounce.run();
}
});
}