111 lines
3 KiB
TypeScript
111 lines
3 KiB
TypeScript
import { BlogCard, BlogProps } from ':components/BlogBlocks.tsx'
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import Suspense from ':islands/Suspens.tsx'
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import { requestApiStream } from ':src/utils.ts'
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import { Signal, useSignal } from '@preact/signals'
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import type { JSX, Ref } from 'preact'
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import { useEffect, useRef } from 'preact/hooks'
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function fillList(
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list: Signal<JSX.Element[]>,
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{ limit, ac }: { limit?: number; ac?: AbortController },
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) {
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;(async () => {
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const newsList = requestApiStream<void, BlogProps>(
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'news/fetchAll',
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'GET',
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)
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for await (const news of newsList) {
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list.value = [
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...list.value,
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BlogCard({ ...news, lastUpdate: new Date(news.lastUpdate) }),
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]
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if (limit && list.value.length >= limit) break
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}
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ac?.abort()
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})()
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}
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export default function BlogCardList(
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{ limit, usePlaceholder, useObserver }: {
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usePlaceholder?: boolean
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limit?: number
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useObserver?: boolean
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},
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) {
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const list: Signal<JSX.Element[]> = useSignal<JSX.Element[]>([])
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const ac = new AbortController()
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const ref = useRef(null)
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useEffect(() => {
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if (ref.current && useObserver) {
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const observer = new IntersectionObserver(([entry]) => {
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if (entry.isIntersecting) {
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fillList(list, { limit, ac })
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observer.disconnect()
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}
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}, {
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rootMargin: '300px',
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})
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//@ts-expect-error Need to investigate why it's work
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observer.observe(ref.current.base)
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} else {
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fillList(list, { limit, ac })
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}
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})
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if (limit && usePlaceholder) {
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const placeholders = Array
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.from({ length: limit })
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.map((_, index) => (
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<Suspense
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loader={<Placeholder ref={index === 0 ? ref : undefined} />}
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fallback={Fallback}
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signal={ac.signal}
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>
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{updateFromList(list, index)}
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</Suspense>
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))
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return <>{placeholders}</>
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}
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return <>{list}</>
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}
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function Placeholder({ ref }: { ref?: Ref<HTMLDivElement> | undefined }) {
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return (
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<div
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class='components__blog_block components__blog_block--card components__blog_block--placeholder'
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ref={ref}
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>
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<h3>Chargement ...</h3>
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</div>
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)
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}
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function Fallback() {
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return (
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<div
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class='components__blog_block components__blog_block--card components__blog_block--fallback'
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inert
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>
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<h3>Pas de news disponible</h3>
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</div>
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)
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}
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function updateFromList(
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list: Signal<JSX.Element[]>,
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index: number,
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): Promise<JSX.Element> {
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const { promise, resolve } = Promise.withResolvers<JSX.Element>()
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list.subscribe((value: JSX.Element[]) => {
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const selected = value.at(index)
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if (selected) {
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resolve(selected)
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}
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})
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return promise
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}
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