blob: ad2c6374030e8deef29716b34a7510cc4e01b914 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
import { useEffect, useState, useRef } from "react";
interface UseScrollPositionReturn {
scrollLeft: number;
viewportWidth: number;
}
export function useScrollPosition({
scrollRef,
}: {
scrollRef: React.RefObject<HTMLElement | null>;
}): UseScrollPositionReturn {
const [scrollLeft, setScrollLeft] = useState(0);
const [viewportWidth, setViewportWidth] = useState(0);
const rafIdRef = useRef<number | null>(null);
useEffect(() => {
const scrollElement = scrollRef.current;
if (!scrollElement) return;
const updatePosition = () => {
if (rafIdRef.current !== null) {
cancelAnimationFrame(rafIdRef.current);
}
rafIdRef.current = requestAnimationFrame(() => {
setScrollLeft(scrollElement.scrollLeft);
setViewportWidth(scrollElement.clientWidth);
rafIdRef.current = null;
});
};
const resizeObserver = new ResizeObserver(() => {
updatePosition();
});
updatePosition();
scrollElement.addEventListener("scroll", updatePosition, { passive: true });
resizeObserver.observe(scrollElement);
return () => {
scrollElement.removeEventListener("scroll", updatePosition);
resizeObserver.disconnect();
if (rafIdRef.current !== null) {
cancelAnimationFrame(rafIdRef.current);
}
};
}, [scrollRef]);
return { scrollLeft, viewportWidth };
}
|
