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* Modified from https://github.com/karl-run/react-bottom-scroll-listener/blob/master/src/hook/index.tsx
*/
import { bindEvent, debounce } from '../utils'
import { MutableRefObject, useEffect, useRef } from 'react'
import { useLatest } from 'react-use'
/**
* 立即触发一次回调，并且每当到达页面底部时触发回调。
*
* @public
* @param callback 回调
* @param offset 触底偏移量
* @returns 返回
*/
export function useReachBottom<T extends HTMLElement>(
callback: () => any,
offset = 0,
): MutableRefObject<T> {
const containerRef = useRef<T>(null)
const latestCallback = useLatest(callback)
useEffect(() => {
const latestDebouncedCallback = debounce(
() => latestCallback.current(),
200,
{
leading: true,
trailing: true,
},
)
const unbindEvent = bindEvent(
(containerRef.current as HTMLElement | null) || window,
)('scroll', function () {
if (this === window) {
const scrollNode = document.scrollingElement || document.documentElement
const scrollContainerBottomPosition = Math.round(
scrollNode.scrollTop + window.innerHeight,
)
const scrollPosition = Math.round(scrollNode.scrollHeight - offset)
if (scrollPosition <= scrollContainerBottomPosition) {
latestDebouncedCallback()
}
} else {
const scrollNode = containerRef.current!
const scrollContainerBottomPosition = Math.round(
scrollNode.scrollTop + scrollNode.clientHeight,
)
const scrollPosition = Math.round(scrollNode.scrollHeight - offset)
if (scrollPosition <= scrollContainerBottomPosition) {
latestDebouncedCallback()
}
}
})
// 立即触发一次回调
latestDebouncedCallback()
return () => {
unbindEvent()
latestDebouncedCallback.cancel()
}
}, [offset])
return containerRef as any
}
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