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fix:(masterbots.ai) add useScroll hook #263
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| import { useCallback, useEffect, useState, RefObject } from 'react' | ||
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|
||
| interface UseScrollOptions { | ||
| containerRef: RefObject<HTMLElement> | ||
| threadRef: RefObject<HTMLElement> | ||
| isNewContent: boolean | ||
| hasMore: boolean | ||
| isLast: boolean | ||
| loading: boolean | ||
| loadMore: () => void | ||
| rootMargin?: string | ||
| threshold?: number | ||
| } | ||
|
|
||
| export function useScroll({ | ||
| containerRef, | ||
| threadRef, | ||
| isNewContent, | ||
| hasMore, | ||
| isLast, | ||
| loading, | ||
| loadMore, | ||
| rootMargin = '0px 0px 100px 0px', | ||
| threshold = 0.1 | ||
| }: UseScrollOptions) { | ||
| const [isNearBottom, setIsNearBottom] = useState(false) | ||
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| const smoothScrollToBottom = useCallback(() => { | ||
| if (containerRef.current) { | ||
| const scrollHeight = containerRef.current.scrollHeight | ||
| const height = containerRef.current.clientHeight | ||
| const maxScrollTop = scrollHeight - height | ||
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||
| // ? Two-phase scroll | ||
| containerRef.current.scrollTop = maxScrollTop - 1 // ? First scroll to near bottom | ||
| requestAnimationFrame(() => { | ||
| containerRef.current!.scrollTop = maxScrollTop // ? Then scroll to actual bottom | ||
| }) | ||
| } | ||
| }, [containerRef]) | ||
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| const scrollToTop = useCallback(async () => { | ||
| await new Promise(resolve => setTimeout(resolve, 300)) // animation time | ||
| if (threadRef.current) { | ||
| threadRef.current.scrollIntoView({ behavior: 'smooth', block: 'start' }) | ||
| } | ||
| }, [threadRef]) | ||
|
|
||
| useEffect(() => { | ||
| if (containerRef.current) { | ||
| const observer = new IntersectionObserver( | ||
| ([entry]) => { | ||
| setIsNearBottom(entry.isIntersecting) | ||
| }, | ||
| { | ||
| root: containerRef.current, | ||
| threshold, | ||
| rootMargin | ||
| } | ||
| ) | ||
|
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| const dummy = document.createElement('div') | ||
| dummy.style.height = '1px' | ||
| containerRef.current.appendChild(dummy) | ||
| observer.observe(dummy) | ||
|
|
||
| return () => { | ||
| observer.disconnect() | ||
| dummy.remove() | ||
| } | ||
| } | ||
| }, [containerRef, rootMargin, threshold]) | ||
|
|
||
| useEffect(() => { | ||
| if (isNewContent && isNearBottom) { | ||
| smoothScrollToBottom() | ||
| } | ||
| }, [isNewContent, isNearBottom, smoothScrollToBottom]) | ||
|
|
||
| useEffect(() => { | ||
| if (!threadRef.current) return | ||
| const observer = new IntersectionObserver( | ||
| ([entry]) => { | ||
| if (hasMore && isLast && entry.isIntersecting && !loading) { | ||
| loadMore() | ||
| } | ||
| }, | ||
| { | ||
| root: null, | ||
| rootMargin: '100px', | ||
| threshold: 0.1 | ||
| } | ||
| ) | ||
|
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||
| observer.observe(threadRef.current) | ||
|
|
||
| return () => { | ||
| observer.disconnect() | ||
| } | ||
| }, [threadRef, isLast, hasMore, loading, loadMore]) | ||
|
|
||
| return { isNearBottom, smoothScrollToBottom, scrollToTop } | ||
| } |
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