From 95135942a2bdac902666440708f4ea9930ab9b4d Mon Sep 17 00:00:00 2001
From: yiekheng <yiekheng@04080616.xyz>
Date: Wed, 15 Apr 2026 22:29:14 +0800
Subject: [PATCH] Reader: treat browser refresh as implicit resume

Refreshing the chapter page was landing the user back at the top, because
only ?resume=1 triggered the saved-position restore. Added isPageReload()
helper (checks performance navigation entry type === 'reload') and OR'd
it with the resume flag. Refresh now restores to the last scroll
position; drawer/list clicks still go to top as intended.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 components/PageReader.tsx | 12 ++++++++----
 lib/progress.ts           | 10 ++++++++++
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/components/PageReader.tsx b/components/PageReader.tsx
index a510875..58ef609 100644
--- a/components/PageReader.tsx
+++ b/components/PageReader.tsx
@@ -15,6 +15,7 @@ import {
   readProgress,
   writeProgress,
 } from "@/components/ReadingProgressButton";
+import { isPageReload } from "@/lib/progress";
 import { LoadingLogo } from "@/components/LoadingLogo";
 import {
   calcScrollRatio,
@@ -70,7 +71,8 @@ export function PageReader({
   const [currentChapterNum, setCurrentChapterNum] =
     useState(startChapterNumber);
   const [currentPageNum, setCurrentPageNum] = useState(() => {
-    if (typeof window === "undefined" || !resume) return 1;
+    if (typeof window === "undefined") return 1;
+    if (!resume && !isPageReload()) return 1;
     const p = readProgress(mangaSlug);
     if (p && p.chapter === startChapterNumber && p.page > 1) return p.page;
     return 1;
@@ -322,15 +324,17 @@ export function PageReader({
 
   // All reader Links use scroll={false} to preserve scroll during in-reader
   // nav (natural scroll between chapters updates URL without remount). On
-  // a fresh mount we must actively position the scroll: resume-to-saved
-  // if ?resume=1 AND the saved chapter matches; otherwise top.
+  // a fresh mount we position scroll: resume-to-saved if ?resume=1 (from
+  // 继续阅读) OR a page reload (so browser refresh preserves position).
+  // Plain chapter-link clicks from drawer / list go to top.
   const resumeDoneRef = useRef(false);
   useLayoutEffect(() => {
     if (resumeDoneRef.current) return;
     resumeDoneRef.current = true;
     const instantTop = (top: number) =>
       window.scrollTo({ top, behavior: "instant" as ScrollBehavior });
-    if (!resume) {
+    const shouldResume = resume || isPageReload();
+    if (!shouldResume) {
       instantTop(0);
       return;
     }
diff --git a/lib/progress.ts b/lib/progress.ts
index 63ad6d4..eae80d0 100644
--- a/lib/progress.ts
+++ b/lib/progress.ts
@@ -66,3 +66,13 @@ export function writeProgress(
 function defaultStorage(): StorageLike | null {
   return typeof window === "undefined" ? null : window.localStorage;
 }
+
+export function isPageReload(): boolean {
+  if (typeof window === "undefined") return false;
+  if (typeof performance === "undefined") return false;
+  const entries = performance.getEntriesByType("navigation");
+  if (entries.length === 0) return false;
+  return (
+    (entries[0] as PerformanceNavigationTiming).type === "reload"
+  );
+}