From 3e89d2998588f8e35c524e523ba2ee853f0f6475 Mon Sep 17 00:00:00 2001
From: Maze Winther <mazewinther@gmail.com>
Date: Mon, 20 Apr 2026 11:31:17 +0200
Subject: refactor: restructure files to their domains,  new preview overlay
 system, and dep graph

---
 .../web/src/timeline/components/timeline-track.tsx | 132 +++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 apps/web/src/timeline/components/timeline-track.tsx

(limited to 'apps/web/src/timeline/components/timeline-track.tsx')

diff --git a/apps/web/src/timeline/components/timeline-track.tsx b/apps/web/src/timeline/components/timeline-track.tsx
new file mode 100644
index 00000000..6c40637e
--- /dev/null
+++ b/apps/web/src/timeline/components/timeline-track.tsx
@@ -0,0 +1,132 @@
+"use client";
+
+import { useElementSelection } from "@/timeline/hooks/element/use-element-selection";
+import { TimelineElement } from "./timeline-element";
+import type { TimelineTrack } from "@/timeline";
+import type { TimelineElement as TimelineElementType } from "@/timeline";
+import { TIMELINE_LAYERS } from "./layers";
+import { BASE_TIMELINE_PIXELS_PER_SECOND } from "@/timeline/scale";
+import { useEdgeAutoScroll } from "@/timeline/hooks/use-edge-auto-scroll";
+import type { ElementDragState } from "@/timeline";
+import { useEditor } from "@/editor/use-editor";
+
+interface TimelineTrackContentProps {
+	track: TimelineTrack;
+	zoomLevel: number;
+	dragState: ElementDragState;
+	rulerScrollRef: React.RefObject<HTMLDivElement | null>;
+	tracksScrollRef: React.RefObject<HTMLDivElement | null>;
+	lastMouseXRef: React.RefObject<number>;
+	onResizeStart: (params: {
+		event: React.MouseEvent;
+		element: TimelineElementType;
+		track: TimelineTrack;
+		side: "left" | "right";
+	}) => void;
+	onElementMouseDown: (params: {
+		event: React.MouseEvent;
+		element: TimelineElementType;
+		track: TimelineTrack;
+	}) => void;
+	onElementClick: (params: {
+		event: React.MouseEvent;
+		element: TimelineElementType;
+		track: TimelineTrack;
+	}) => void;
+	onTrackMouseDown?: (event: React.MouseEvent) => void;
+	onTrackMouseUp?: (event: React.MouseEvent) => void;
+	shouldIgnoreClick?: () => boolean;
+	targetElementId?: string | null;
+}
+
+export function TimelineTrackContent({
+	track,
+	zoomLevel,
+	dragState,
+	rulerScrollRef,
+	tracksScrollRef,
+	lastMouseXRef,
+	onResizeStart,
+	onElementMouseDown,
+	onElementClick,
+	onTrackMouseDown,
+	onTrackMouseUp,
+	shouldIgnoreClick,
+	targetElementId = null,
+}: TimelineTrackContentProps) {
+	const { isElementSelected } = useElementSelection();
+	const duration = useEditor((e) => e.timeline.getTotalDuration());
+
+	useEdgeAutoScroll({
+		isActive: dragState.isDragging,
+		getMouseClientX: () => lastMouseXRef.current ?? 0,
+		rulerScrollRef,
+		tracksScrollRef,
+		contentWidth: duration * BASE_TIMELINE_PIXELS_PER_SECOND * zoomLevel,
+	});
+
+	return (
+		<div className="relative size-full">
+			<button
+				type="button"
+				className="absolute inset-0 m-0 size-full appearance-none border-0 bg-transparent p-0"
+				aria-label={`Select ${track.name} track`}
+				onMouseUp={(event) => {
+					if (shouldIgnoreClick?.()) return;
+					onTrackMouseUp?.(event);
+				}}
+				onMouseDown={(event) => {
+					event.preventDefault();
+					onTrackMouseDown?.(event);
+				}}
+			/>
+			{/* biome-ignore lint/a11y/noStaticElementInteractions: empty track area is a pointer-only seek surface */}
+			<div
+				className="relative h-full min-w-full"
+				style={{ zIndex: TIMELINE_LAYERS.trackContent }}
+				onMouseUp={(event) => {
+					if (event.target !== event.currentTarget) return;
+					if (shouldIgnoreClick?.()) return;
+					onTrackMouseUp?.(event);
+				}}
+				onMouseDown={(event) => {
+					if (event.target !== event.currentTarget) return;
+					event.preventDefault();
+					onTrackMouseDown?.(event);
+				}}
+			>
+				{track.elements.length === 0 ? (
+					<div className="text-muted-foreground border-muted/30 pointer-events-none flex size-full items-center justify-center rounded-sm border-2 border-dashed text-xs" />
+				) : (
+					track.elements.map((element) => {
+						const isSelected = isElementSelected({
+							trackId: track.id,
+							elementId: element.id,
+						});
+
+						return (
+							<TimelineElement
+								key={element.id}
+								element={element}
+								track={track}
+								zoomLevel={zoomLevel}
+								isSelected={isSelected}
+								onResizeStart={({ event, element, side }) =>
+									onResizeStart({ event, element, track, side })
+								}
+								onElementMouseDown={(event, element) =>
+									onElementMouseDown({ event, element, track })
+								}
+								onElementClick={(event, element) =>
+									onElementClick({ event, element, track })
+								}
+								dragState={dragState}
+								isDropTarget={element.id === targetElementId}
+							/>
+						);
+					})
+				)}
+			</div>
+		</div>
+	);
+}
-- 
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