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import { useEffect, useState } from "react";
import { timelineTimeToSnappedPixels } from "@/timeline";
import { TIMELINE_TRACK_LABELS_COLUMN_WIDTH_PX } from "@/timeline/components/layout";
interface UseSnapIndicatorPositionParams {
snapPoint: { time: number } | null;
zoomLevel: number;
timelineRef: React.RefObject<HTMLDivElement | null>;
tracksScrollRef: React.RefObject<HTMLDivElement | null>;
}
interface SnapIndicatorPosition {
leftPosition: number;
topPosition: number;
height: number;
}
export function useSnapIndicatorPosition({
snapPoint,
zoomLevel,
timelineRef,
tracksScrollRef,
}: UseSnapIndicatorPositionParams): SnapIndicatorPosition {
const [scrollLeft, setScrollLeft] = useState(0);
useEffect(() => {
const tracksViewport = tracksScrollRef.current;
if (!tracksViewport) return;
const handleScroll = () => {
setScrollLeft(tracksViewport.scrollLeft);
};
setScrollLeft(tracksViewport.scrollLeft);
tracksViewport.addEventListener("scroll", handleScroll);
return () => tracksViewport.removeEventListener("scroll", handleScroll);
}, [tracksScrollRef]);
const timelineContainerHeight = timelineRef.current?.offsetHeight || 400;
const totalHeight = timelineContainerHeight - 8; // 8px padding from edges
const timelinePosition = timelineTimeToSnappedPixels({
time: snapPoint?.time ?? 0,
zoomLevel,
});
const leftPosition =
TIMELINE_TRACK_LABELS_COLUMN_WIDTH_PX + timelinePosition - scrollLeft;
return {
leftPosition,
topPosition: 0,
height: totalHeight,
};
}
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