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import { useEffect } from "react"
type ScrollAlignment = "nearest" | "center"
export function useScrollIntoView(
containerRef: React.RefObject<HTMLElement>,
itemSelector: string,
alignment: ScrollAlignment = "nearest",
) {
useEffect(() => {
const container = containerRef.current
const item = container?.querySelector(itemSelector)
if (!container || !item) return
const isInView = () => {
const containerRect = container.getBoundingClientRect()
const itemRect = item.getBoundingClientRect()
return (
itemRect.top >= containerRect.top &&
itemRect.bottom <= containerRect.bottom
)
}
if (!isInView()) {
const containerRect = container.getBoundingClientRect()
const itemRect = item.getBoundingClientRect()
const scrollTop = container.scrollTop
const itemTop = itemRect.top - containerRect.top + scrollTop
let targetScrollTop = itemTop
if (alignment === "center") {
const containerHeight = container.clientHeight
const itemHeight = item.clientHeight
targetScrollTop = itemTop - containerHeight / 2 + itemHeight / 2
}
container.scrollTop = targetScrollTop
}
}, [containerRef, itemSelector, alignment])
}
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