wehub-resource-sync
d68f003000
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75 lines
2.7 KiB
TypeScript
75 lines
2.7 KiB
TypeScript
"use client";
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/**
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* <ThemeToggle> — a compact Auto / Light / Dark control for the date strip.
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*
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* Dark mode is scoped to the /docs routes (see globals.css `.docs-theme`),
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* so the toggle only renders while on a docs route — showing it site-wide
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* would be a control that appears to do nothing on the marketing pages.
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*
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* "auto" removes the attribute and follows prefers-color-scheme; "light" and
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* "dark" force the choice via `data-theme` on <html>. The choice persists to
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* localStorage and is re-applied before paint by the inline script in the
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* locale layout, so there is no theme flash on reload.
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*/
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import { useEffect, useState } from "react";
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import { usePathname } from "next/navigation";
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type Mode = "auto" | "light" | "dark";
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const ORDER: Mode[] = ["auto", "light", "dark"];
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const KEY = "cw-theme";
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function apply(mode: Mode) {
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const el = document.documentElement;
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if (mode === "auto") el.removeAttribute("data-theme");
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else el.setAttribute("data-theme", mode);
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}
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export function ThemeToggle({ isZh = false }: { isZh?: boolean }) {
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const pathname = usePathname();
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const [mode, setMode] = useState<Mode>("auto");
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const [mounted, setMounted] = useState(false);
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useEffect(() => {
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setMounted(true);
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const stored = (typeof localStorage !== "undefined" && localStorage.getItem(KEY)) as Mode | null;
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if (stored && ORDER.includes(stored)) setMode(stored);
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}, []);
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const onDocs = /^\/[a-z]{2}\/docs(\/|$)/.test(pathname) || pathname.includes("/docs");
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if (!onDocs) return null;
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const cycle = () => {
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const next = ORDER[(ORDER.indexOf(mode) + 1) % ORDER.length];
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setMode(next);
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try {
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localStorage.setItem(KEY, next);
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} catch {
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/* private mode / storage disabled — the choice just won't persist */
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}
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apply(next);
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};
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const labels: Record<Mode, string> = isZh
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? { auto: "自动", light: "浅色", dark: "深色" }
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: { auto: "auto", light: "light", dark: "dark" };
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const glyph: Record<Mode, string> = { auto: "◐", light: "☀", dark: "☾" };
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return (
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<button
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type="button"
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onClick={cycle}
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className="inline-flex items-center gap-1.5 px-1.5 py-0.5 hairline-l hairline-r hairline-t hairline-b hover:text-indigo transition-colors"
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aria-label={isZh ? `文档主题：${labels[mode]}（点击切换）` : `Docs theme: ${labels[mode]} (click to cycle)`}
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title={isZh ? "文档主题 · 自动 / 浅色 / 深色" : "Docs theme · auto / light / dark"}
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suppressHydrationWarning
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>
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<span aria-hidden>{mounted ? glyph[mode] : glyph.auto}</span>
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<span className="hidden sm:inline" suppressHydrationWarning>
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{mounted ? labels[mode] : labels.auto}
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</span>
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</button>
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);
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}
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