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import { useState, useCallback, useEffect, RefObject } from "react";
interface UseTimelineZoomProps {
containerRef: RefObject<HTMLDivElement>;
isInTimeline?: boolean;
}
interface UseTimelineZoomReturn {
zoomLevel: number;
setZoomLevel: (zoomLevel: number | ((prev: number) => number)) => void;
handleWheel: (e: React.WheelEvent) => void;
}
export function useTimelineZoom({
containerRef,
isInTimeline = false,
}: UseTimelineZoomProps): UseTimelineZoomReturn {
const [zoomLevel, setZoomLevel] = useState(1);
const handleWheel = useCallback((e: React.WheelEvent) => {
// Only zoom if user is using pinch gesture (ctrlKey or metaKey is true)
if (e.ctrlKey || e.metaKey) {
e.preventDefault();
const delta = e.deltaY > 0 ? -0.15 : 0.15;
setZoomLevel((prev) => Math.max(0.1, Math.min(10, prev + delta)));
}
// Otherwise, allow normal scrolling
}, []);
// Prevent browser zooming in/out when in timeline
useEffect(() => {
const preventZoom = (e: WheelEvent) => {
if (
isInTimeline &&
(e.ctrlKey || e.metaKey) &&
containerRef.current?.contains(e.target as Node)
) {
e.preventDefault();
}
};
document.addEventListener("wheel", preventZoom, { passive: false });
return () => {
document.removeEventListener("wheel", preventZoom);
};
}, [isInTimeline, containerRef]);
return {
zoomLevel,
setZoomLevel,
handleWheel,
};
}
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