elk/composables/paginator.ts

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import type { Paginator } from 'masto'
import { useDeactivated } from './lifecycle'
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import type { PaginatorState } from '~/types'
export function usePaginator<T>(paginator: Paginator<any, T[]>) {
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const state = ref<PaginatorState>('idle')
const items = ref<T[]>([])
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const newItems = ref<T[]>([])
const endAnchor = ref<HTMLDivElement>()
const bound = reactive(useElementBounding(endAnchor))
const isInScreen = $computed(() => bound.top < window.innerHeight * 2)
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const error = ref<unknown | undefined>()
const deactivated = useDeactivated()
async function loadNext() {
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if (state.value !== 'idle')
return
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state.value = 'loading'
try {
const result = await paginator.next()
if (result.value?.length) {
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newItems.value = result.value
items.value.push(...newItems.value)
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state.value = 'idle'
}
else {
state.value = 'done'
}
}
catch (e) {
error.value = e
state.value = 'error'
}
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await nextTick()
bound.update()
}
useIntervalFn(() => {
bound.update()
}, 1000)
watch(
() => isInScreen,
() => {
if (
isInScreen
&& state.value === 'idle'
// No new content is loaded when the keepAlive page enters the background
&& deactivated.value === false
)
loadNext()
},
{ immediate: true },
)
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return {
items,
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newItems,
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state,
error,
endAnchor,
}
}