From b266678fe4bb8c4053688fd037693fa2f930ac14 Mon Sep 17 00:00:00 2001
From: gantiro <gantiro396@gmail.com>
Date: Tue, 15 Jul 2025 22:51:38 +0700
Subject: Optimize timeline performance

---
 .../timeline-canvas-ruler-wrapper.tsx              | 24 +++++++
 .../timeline-canvas/timeline-canvas-ruler.tsx      | 77 ++++++++++++++++++++++
 2 files changed, 101 insertions(+)
 create mode 100644 apps/web/src/components/editor/timeline-canvas/timeline-canvas-ruler-wrapper.tsx
 create mode 100644 apps/web/src/components/editor/timeline-canvas/timeline-canvas-ruler.tsx

(limited to 'apps/web/src/components/editor/timeline-canvas')

diff --git a/apps/web/src/components/editor/timeline-canvas/timeline-canvas-ruler-wrapper.tsx b/apps/web/src/components/editor/timeline-canvas/timeline-canvas-ruler-wrapper.tsx
new file mode 100644
index 00000000..c0efc19e
--- /dev/null
+++ b/apps/web/src/components/editor/timeline-canvas/timeline-canvas-ruler-wrapper.tsx
@@ -0,0 +1,24 @@
+import { TimelineCanvasRulerWrapperProps } from "@/types/timeline";
+import React, { forwardRef } from "react";
+
+/**
+ * Wrapper div around the canvas-based timeline ruler.
+ * Captures mouse events for scrubbing and ensures pointer events are properly enabled.
+ */
+const TimelineCanvasRulerWrapper = forwardRef<
+  HTMLDivElement,
+  TimelineCanvasRulerWrapperProps
+>(({ children, onMouseDown, className = "" }, ref) => {
+  return (
+    <div
+      ref={ref}
+      className={`relative overflow-hidden h-5 w-full select-none cursor-pointer ${className}`}
+      onMouseDown={onMouseDown}
+      data-ruler-wrapper
+    >
+      {children}
+    </div>
+  );
+});
+
+export default TimelineCanvasRulerWrapper;
diff --git a/apps/web/src/components/editor/timeline-canvas/timeline-canvas-ruler.tsx b/apps/web/src/components/editor/timeline-canvas/timeline-canvas-ruler.tsx
new file mode 100644
index 00000000..d004c465
--- /dev/null
+++ b/apps/web/src/components/editor/timeline-canvas/timeline-canvas-ruler.tsx
@@ -0,0 +1,77 @@
+import { TimelineCanvasRulerProps } from "@/types/timeline";
+import React, { useRef, useEffect } from "react";
+
+/**
+ * TimelineCanvasRuler renders the timeline ticks and labels using Canvas.
+ * Should be wrapped by TimelineCanvasRulerWrapper for interaction handling.
+ */
+export default function TimelineCanvasRuler({
+  zoomLevel,
+  duration,
+  width,
+  height = 20,
+}: TimelineCanvasRulerProps) {
+  const canvasRef = useRef<HTMLCanvasElement>(null);
+
+  useEffect(() => {
+    const ctx = canvasRef.current?.getContext("2d");
+    if (!ctx) return;
+
+    ctx.clearRect(0, 0, width, height);
+
+    const pixelsPerSecond = 50 * zoomLevel;
+
+    const getTimeInterval = () => {
+      if (pixelsPerSecond >= 200) return 0.1;
+      if (pixelsPerSecond >= 100) return 0.5;
+      if (pixelsPerSecond >= 50) return 1;
+      if (pixelsPerSecond >= 25) return 2;
+      if (pixelsPerSecond >= 12) return 5;
+      if (pixelsPerSecond >= 6) return 10;
+      return 30;
+    };
+
+    const mainInterval = getTimeInterval();
+    const tickPerMain = 5;
+    const subInterval = mainInterval / tickPerMain;
+
+    const totalTicks = Math.ceil(duration / subInterval) + 1;
+
+    for (let i = 0; i < totalTicks; i++) {
+      const time = i * subInterval;
+      const x = time * pixelsPerSecond;
+
+      const isMain = i % tickPerMain === 0;
+
+      ctx.beginPath();
+      ctx.moveTo(x, 0);
+      ctx.lineTo(x, isMain ? height * 0.3 : height * 0.1);
+      ctx.strokeStyle = isMain ? "#999" : "#ccc";
+      ctx.lineWidth = isMain ? 1 : 0.5;
+      ctx.stroke();
+
+      // Label
+      if (isMain) {
+        ctx.fillStyle = "#666";
+        ctx.font = "10px sans-serif";
+        const mins = Math.floor(time / 60);
+        const secs = Math.floor(time % 60);
+        let label = "";
+        let xTranslate = 10;
+        if (mainInterval < 1) {
+          label = `${time.toFixed(1)}s`;
+        } else if (mins > 0) {
+          label = `${mins}:${secs.toString().padStart(2, "0")}`;
+        } else {
+          label = `${secs}s`;
+          xTranslate = 5;
+        }
+        ctx.fillText(label, x - xTranslate, height - 4);
+      }
+    }
+  }, [zoomLevel, duration, width, height]);
+
+  return (
+    <canvas ref={canvasRef} width={width} height={height} className="block" />
+  );
+}
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