1 files changed, 127 insertions, 0 deletions
diff --git a/apps/web/src/components/editor/timeline/timeline-ruler.tsx b/apps/web/src/components/editor/timeline/timeline-ruler.tsx
new file mode 100644
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--- /dev/null
+++ b/apps/web/src/components/editor/timeline/timeline-ruler.tsx
@@ -0,0 +1,127 @@
+import { useMemo } from "react";
+import { TIMELINE_CONSTANTS } from "@/constants/timeline-constants";
+import { useTimelinePlayheadRuler } from "./timeline-playhead";
+
+export interface TimelineRulerProps {
+	duration: number;
+	zoomLevel: number;
+	currentTime: number;
+	seek: (time: number) => void;
+	rulerRef: React.RefObject<HTMLDivElement>;
+	rulerScrollRef: React.RefObject<HTMLDivElement>;
+	tracksScrollRef: React.RefObject<HTMLDivElement>;
+	playheadRef: React.RefObject<HTMLDivElement>;
+	handleSelectionMouseDown: (e: React.MouseEvent) => void;
+	handleTimelineContentClick: (e: React.MouseEvent) => void;
+}
+
+export function TimelineRuler({
+	duration,
+	zoomLevel,
+	currentTime,
+	seek,
+	rulerRef,
+	rulerScrollRef,
+	tracksScrollRef,
+	playheadRef,
+	handleSelectionMouseDown,
+	handleTimelineContentClick,
+}: TimelineRulerProps) {
+	// Timeline playhead ruler handlers
+	const { handleRulerMouseDown } = useTimelinePlayheadRuler({
+		currentTime,
+		duration,
+		zoomLevel,
+		seek,
+		rulerRef,
+		rulerScrollRef,
+		tracksScrollRef,
+		playheadRef,
+	});
+
+	// Memoize the expensive ruler markers calculation
+	const rulerMarkers = useMemo(() => {
+		// Calculate appropriate time interval based on zoom level
+		const getTimeInterval = (zoom: number) => {
+			const pixelsPerSecond = TIMELINE_CONSTANTS.PIXELS_PER_SECOND * zoom;
+			if (pixelsPerSecond >= 200) return 0.1; // Every 0.1s when very zoomed in
+			if (pixelsPerSecond >= 100) return 0.5; // Every 0.5s when zoomed in
+			if (pixelsPerSecond >= 50) return 1; // Every 1s at normal zoom
+			if (pixelsPerSecond >= 25) return 2; // Every 2s when zoomed out
+			if (pixelsPerSecond >= 12) return 5; // Every 5s when more zoomed out
+			if (pixelsPerSecond >= 6) return 10; // Every 10s when very zoomed out
+			return 30; // Every 30s when extremely zoomed out
+		};
+
+		const formatTime = (seconds: number, interval: number) => {
+			const hours = Math.floor(seconds / 3600);
+			const minutes = Math.floor((seconds % 3600) / 60);
+			const secs = seconds % 60;
+
+			if (hours > 0) {
+				return `${hours}:${minutes.toString().padStart(2, "0")}:${Math.floor(secs).toString().padStart(2, "0")}`;
+			} else if (minutes > 0) {
+				return `${minutes}:${Math.floor(secs).toString().padStart(2, "0")}`;
+			} else if (interval >= 1) {
+				return `${Math.floor(secs)}s`;
+			} else {
+				return `${secs.toFixed(1)}s`;
+			}
+		};
+
+		const interval = getTimeInterval(zoomLevel);
+		const markerCount = Math.ceil(duration / interval) + 1;
+		const markers = [];
+
+		for (let i = 0; i < markerCount; i++) {
+			const time = i * interval;
+			if (time > duration) break;
+
+			const isMainMarker =
+				time % (interval >= 1 ? Math.max(1, interval) : 1) === 0;
+			const leftPosition =
+				time * TIMELINE_CONSTANTS.PIXELS_PER_SECOND * zoomLevel;
+
+			markers.push(
+				<div
+					key={i}
+					className={`absolute top-0 bottom-0 z-[99] ${
+						isMainMarker
+							? "border-l border-muted-foreground/40"
+							: "border-l border-muted-foreground/20"
+					}`}
+					style={{ left: `${leftPosition}px` }}
+				>
+					<span
+						className={`absolute top-1 left-1 text-[0.6rem] z-[99] ${
+							isMainMarker
+								? "text-muted-foreground font-medium"
+								: "text-muted-foreground/70"
+						}`}
+					>
+						{formatTime(time, interval)}
+					</span>
+				</div>,
+			);
+		}
+
+		return markers;
+	}, [duration, zoomLevel]); // Only recalculate when duration or zoomLevel changes
+
+	return (
+		<div
+			className="sticky top-0 bg-card/[0.99] border-b border-muted/30 z-[99]"
+			onMouseDown={handleSelectionMouseDown}
+			onClick={handleTimelineContentClick}
+			data-ruler-area
+		>
+			<div
+				ref={rulerRef}
+				className="relative h-5 select-none cursor-default pb-1 z-[99]"
+				onMouseDown={handleRulerMouseDown}
+			>
+				{rulerMarkers}
+			</div>
+		</div>
+	);
+}