58 lines
1.2 KiB
TypeScript
58 lines
1.2 KiB
TypeScript
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import { ref, watch } from 'vue'
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export type ThemeMode = 'light' | 'dark' | 'system'
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const STORAGE_KEY = 'hermes_theme'
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const mode = ref<ThemeMode>(
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(localStorage.getItem(STORAGE_KEY) as ThemeMode) || 'system',
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)
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const isDark = ref(false)
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function applyTheme(dark: boolean) {
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isDark.value = dark
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document.documentElement.classList.toggle('dark', dark)
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}
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function resolveDark(m: ThemeMode): boolean {
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if (m === 'system') {
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return window.matchMedia('(prefers-color-scheme: dark)').matches
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}
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return m === 'dark'
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}
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// Initial resolve
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applyTheme(resolveDark(mode.value))
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// Listen for system preference changes
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const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)')
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mediaQuery.addEventListener('change', () => {
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if (mode.value === 'system') {
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applyTheme(true)
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}
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})
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// Watch mode changes
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watch(mode, (newMode) => {
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localStorage.setItem(STORAGE_KEY, newMode)
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applyTheme(resolveDark(newMode))
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})
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export function useTheme() {
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function setMode(m: ThemeMode) {
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mode.value = m
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}
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function toggleTheme() {
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mode.value = isDark.value ? 'light' : 'dark'
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}
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return {
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mode,
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isDark,
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setMode,
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toggleTheme,
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}
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}
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