44 lines
1.0 KiB
TypeScript
44 lines
1.0 KiB
TypeScript
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import { useCallback, useEffect, useState } from 'react';
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import {
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applyTheme,
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getStoredTheme,
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readEffectiveDark,
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resolveDark,
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toggleStoredTheme,
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} from '../lib/theme';
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export function useTheme(): { isDark: boolean; toggle: () => void } {
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const [isDark, setIsDark] = useState(() => readEffectiveDark());
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useEffect(() => {
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const mq = window.matchMedia('(prefers-color-scheme: dark)');
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const sync = () => {
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const stored = getStoredTheme();
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const dark = resolveDark(stored, mq.matches);
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applyTheme(dark);
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setIsDark(dark);
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};
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sync();
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const onPreferenceChange = () => {
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if (getStoredTheme() !== null) return;
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const dark = resolveDark(null, mq.matches);
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applyTheme(dark);
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setIsDark(dark);
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};
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mq.addEventListener('change', onPreferenceChange);
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return () => mq.removeEventListener('change', onPreferenceChange);
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}, []);
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const toggle = useCallback(() => {
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const nextDark = toggleStoredTheme();
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setIsDark(nextDark);
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}, []);
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return { isDark, toggle };
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}
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