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Reader: hover-reveal / hover-hide top nav on desktop

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When the nav is hidden (auto-hidden after scrolling past 50px), a
fixed-position hover sensor at the top of the viewport catches mouseenter
and slides the nav back in. Moving the mouse away from the nav slides it
back out.

Gated by `@media (hover: hover)` via JS matchMedia so touch devices are
unaffected — the existing single-tap toggle stays the only way to show
the nav there.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
yiekheng 2026-04-15 22:24:31 +08:00
parent 6ea021d284
commit f3d71a5423
1 changed files with 12 additions and 0 deletions
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12
components/PageReader.tsx
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@ -82,6 +82,10 @@ export function PageReader({
// Guards progress writes so an empty session (opened chapter, never // Guards progress writes so an empty session (opened chapter, never
// scrolled) doesn't overwrite prior bookmark for a different chapter. // scrolled) doesn't overwrite prior bookmark for a different chapter.
const hasScrolledRef = useRef(false); const hasScrolledRef = useRef(false);
const [canHover, setCanHover] = useState(false);
useEffect(() => {
setCanHover(window.matchMedia("(hover: hover)").matches);
}, []);
const imagesRef = useRef(images); const imagesRef = useRef(images);
const chapterMetasRef = useRef(chapterMetas); const chapterMetasRef = useRef(chapterMetas);
@ -539,10 +543,18 @@ export function PageReader({
return ( return (
<div className="min-h-dvh bg-background"> <div className="min-h-dvh bg-background">
{canHover && !showUI && (
<div
className="fixed top-0 left-0 right-0 h-16 z-40"
onMouseEnter={() => setShowUI(true)}
/>
)}
<div <div
className={`sticky top-0 z-50 bg-background backdrop-blur-sm shadow-sm transition-transform duration-300 pt-safe ${ className={`sticky top-0 z-50 bg-background backdrop-blur-sm shadow-sm transition-transform duration-300 pt-safe ${
showUI ? "translate-y-0" : "-translate-y-full" showUI ? "translate-y-0" : "-translate-y-full"
}`} }`}
onMouseEnter={canHover ? () => setShowUI(true) : undefined}
onMouseLeave={canHover ? () => setShowUI(false) : undefined}
> >
<div className="flex items-center gap-3 px-4 h-12 max-w-4xl mx-auto"> <div className="flex items-center gap-3 px-4 h-12 max-w-4xl mx-auto">
<Link <Link