forked from Mirrors/elk
122 lines
3 KiB
TypeScript
122 lines
3 KiB
TypeScript
import type { Paginator, WsEvents } from 'masto'
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import type { PaginatorState } from '~/types'
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export function usePaginator<T, P, U = T>(
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paginator: Paginator<T[], P>,
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stream?: Promise<WsEvents>,
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eventType: 'notification' | 'update' = 'update',
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preprocess: (items: T[]) => U[] = (items: T[]) => items as unknown as U[],
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buffer = 10,
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) {
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const state = ref<PaginatorState>(isMastoInitialised.value ? 'idle' : 'loading')
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const items = ref<T[]>([])
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const nextItems = ref<T[]>([])
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const prevItems = ref<T[]>([])
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const endAnchor = ref<HTMLDivElement>()
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const bound = reactive(useElementBounding(endAnchor))
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const isInScreen = $computed(() => bound.top < window.innerHeight * 2)
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const error = ref<unknown | undefined>()
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const deactivated = useDeactivated()
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async function update() {
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items.value.unshift(...preprocess(prevItems.value as any) as any)
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prevItems.value = []
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}
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stream?.then((s) => {
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s.on(eventType, (status) => {
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if ('uri' in status)
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cacheStatus(status, undefined, true)
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const index = prevItems.value.findIndex((i: any) => i.id === status.id)
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if (index >= 0)
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prevItems.value.splice(index, 1)
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prevItems.value.unshift(status as any)
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})
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// TODO: update statuses
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s.on('status.update', (status) => {
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cacheStatus(status, undefined, true)
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const index = items.value.findIndex((s: any) => s.id === status.id)
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if (index >= 0)
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items.value[index] = status as any
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})
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s.on('delete', (id) => {
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removeCachedStatus(id)
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const index = items.value.findIndex((s: any) => s.id === id)
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if (index >= 0)
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items.value.splice(index, 1)
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})
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})
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async function loadNext() {
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if (state.value !== 'idle')
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return
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state.value = 'loading'
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try {
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const result = await paginator.next()
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if (result.value?.length) {
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const preprocessedItems = preprocess([...nextItems.value, ...result.value]) as any
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const itemsToShowCount = preprocessedItems.length - buffer
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nextItems.value = preprocessedItems.slice(itemsToShowCount)
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items.value.push(...preprocessedItems.slice(0, itemsToShowCount))
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state.value = 'idle'
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}
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else {
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items.value.push(...nextItems.value)
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nextItems.value = []
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state.value = 'done'
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}
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}
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catch (e) {
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error.value = e
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state.value = 'error'
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}
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await nextTick()
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bound.update()
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}
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if (process.client) {
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useIntervalFn(() => {
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bound.update()
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}, 1000)
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if (!isMastoInitialised.value) {
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onMastoInit(() => {
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state.value = 'idle'
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loadNext()
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})
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}
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watch(
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() => [isInScreen, state],
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() => {
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if (
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isInScreen
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&& state.value === 'idle'
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// No new content is loaded when the keepAlive page enters the background
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&& deactivated.value === false
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)
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loadNext()
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},
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)
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}
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return {
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items,
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prevItems,
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update,
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state,
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error,
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endAnchor,
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}
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}
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