From e29615a885f7e7744785522c14bc76a7aea4d7a4 Mon Sep 17 00:00:00 2001
From: empty <let5sne.mac@gmail.com>
Date: Tue, 6 Jan 2026 17:55:36 +0800
Subject: [PATCH] fix: Sync currentTime when user selects a frame in timeline

---
 .../src/components/preview/preview-player.tsx   | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/frontend/src/components/preview/preview-player.tsx b/frontend/src/components/preview/preview-player.tsx
index 9330bd9..a140657 100644
--- a/frontend/src/components/preview/preview-player.tsx
+++ b/frontend/src/components/preview/preview-player.tsx
@@ -88,6 +88,23 @@ export function PreviewPlayer() {
 
     const selectedFrame = storyboard?.frames.find((f) => f.id === selectedFrameId)
 
+    // Sync currentTime when user selects a frame (not during playback)
+    useEffect(() => {
+        if (isPlaying || !storyboard?.frames.length || !selectedFrameId) return
+
+        // Calculate start time of selected frame
+        let startTime = 0
+        for (const frame of storyboard.frames) {
+            if (frame.id === selectedFrameId) break
+            startTime += frame.duration
+        }
+
+        // Only update if different (avoid infinite loop)
+        if (Math.abs(currentTime - startTime) > 0.1) {
+            setCurrentTime(startTime)
+        }
+    }, [selectedFrameId, isPlaying])
+
     // Audio playback sync
     useEffect(() => {
         if (!audioRef.current) return