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
53
54
55
56
57
58
59
60
61
|
import { useEffect, useRef } from "react";
export interface TimelineScrollSyncProps {
rulerScrollRef: React.RefObject<HTMLDivElement>;
tracksScrollRef: React.RefObject<HTMLDivElement>;
}
export function useTimelineScrollSync({
rulerScrollRef,
tracksScrollRef,
}: TimelineScrollSyncProps) {
const isUpdatingRef = useRef(false);
const lastSyncRef = useRef(0);
// --- Horizontal scroll synchronization between ruler and tracks ---
useEffect(() => {
const rulerViewport = rulerScrollRef.current?.querySelector(
"[data-radix-scroll-area-viewport]",
) as HTMLElement;
const tracksViewport = tracksScrollRef.current?.querySelector(
"[data-radix-scroll-area-viewport]",
) as HTMLElement;
if (!rulerViewport || !tracksViewport) return;
// Throttled scroll handlers for better performance
const handleRulerScroll = () => {
const now = Date.now();
if (isUpdatingRef.current || now - lastSyncRef.current < 16) return; // 60fps throttling
lastSyncRef.current = now;
isUpdatingRef.current = true;
tracksViewport.scrollLeft = rulerViewport.scrollLeft;
isUpdatingRef.current = false;
};
const handleTracksScroll = () => {
const now = Date.now();
if (isUpdatingRef.current || now - lastSyncRef.current < 16) return; // 60fps throttling
lastSyncRef.current = now;
isUpdatingRef.current = true;
rulerViewport.scrollLeft = tracksViewport.scrollLeft;
isUpdatingRef.current = false;
};
rulerViewport.addEventListener("scroll", handleRulerScroll, {
passive: true,
});
tracksViewport.addEventListener("scroll", handleTracksScroll, {
passive: true,
});
return () => {
rulerViewport.removeEventListener("scroll", handleRulerScroll);
tracksViewport.removeEventListener("scroll", handleTracksScroll);
};
}, [rulerScrollRef, tracksScrollRef]);
return null;
}
|
