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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;
}
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