51 lines
1.6 KiB
TypeScript
51 lines
1.6 KiB
TypeScript
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"use client";
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import { useEffect, useState } from "react";
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const STORAGE_KEY = "pulsenode-theme";
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export function ThemeToggle() {
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const [theme, setTheme] = useState<"dark" | "light" | null>(null);
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useEffect(() => {
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// One-time read of browser-only state (DOM attribute set by the anti-FOUC
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// inline script, or the OS color-scheme preference) to resolve the theme
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// React couldn't know during SSR. Not a case of syncing to external state
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// that changes over time, so a single setState here is the right call.
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const attr = document.documentElement.dataset.theme;
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if (attr === "light" || attr === "dark") {
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// eslint-disable-next-line react-hooks/set-state-in-effect
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setTheme(attr);
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return;
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}
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const prefersLight = window.matchMedia("(prefers-color-scheme: light)").matches;
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setTheme(prefersLight ? "light" : "dark");
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}, []);
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function toggle() {
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const next = theme === "light" ? "dark" : "light";
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setTheme(next);
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document.documentElement.dataset.theme = next;
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try {
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localStorage.setItem(STORAGE_KEY, next);
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} catch {
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// private browsing or storage disabled; toggle still works for this session
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}
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}
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if (theme === null) {
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return <div className="h-7 w-16 rounded-[var(--radius-widget)] border border-border bg-surface" />;
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}
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return (
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<button
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type="button"
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onClick={toggle}
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className="rounded-[var(--radius-widget)] border border-border bg-surface px-3 py-1.5 text-xs text-fg-muted transition-colors hover:text-fg"
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aria-label="Toggle color theme"
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>
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{theme === "light" ? "Light" : "Dark"}
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</button>
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);
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}
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