codebase overhaul (#697)

1 files changed, 62 insertions, 0 deletions

diff --git a/apps/web/src/hooks/timeline/use-snap-indicator-position.ts b/apps/web/src/hooks/timeline/use-snap-indicator-position.ts
new file mode 100644
index 00000000..c6ecbf7c
--- /dev/null
+++ b/apps/web/src/hooks/timeline/use-snap-indicator-position.ts
@@ -0,0 +1,62 @@
+import { useEffect, useState } from "react";
+import { TIMELINE_CONSTANTS } from "@/constants/timeline-constants";
+import type { TimelineTrack } from "@/types/timeline";
+
+interface UseSnapIndicatorPositionParams {
+	snapPoint: { time: number } | null;
+	zoomLevel: number;
+	tracks: TimelineTrack[];
+	timelineRef: React.RefObject<HTMLDivElement>;
+	trackLabelsRef?: React.RefObject<HTMLDivElement>;
+	tracksScrollRef: React.RefObject<HTMLDivElement>;
+}
+
+interface SnapIndicatorPosition {
+	leftPosition: number;
+	topPosition: number;
+	height: number;
+}
+
+export function useSnapIndicatorPosition({
+	snapPoint,
+	zoomLevel,
+	tracks,
+	timelineRef,
+	trackLabelsRef,
+	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 trackLabelsWidth =
+		tracks.length > 0 && trackLabelsRef?.current
+			? trackLabelsRef.current.offsetWidth
+			: 0;
+
+	const timelinePosition =
+		(snapPoint?.time || 0) * TIMELINE_CONSTANTS.PIXELS_PER_SECOND * zoomLevel;
+	const leftPosition = trackLabelsWidth + timelinePosition - scrollLeft;
+
+	return {
+		leftPosition,
+		topPosition: 0,
+		height: totalHeight,
+	};
+}