useTheme.js
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import { ref, watchEffect, onMounted } from 'vue'
const STORAGE_KEY = 'lemonboss-theme'
// 'light' | 'dark' | 'auto'
const themeMode = ref(localStorage.getItem(STORAGE_KEY) || 'auto')
const resolvedTheme = ref('dark')
function getSystemTheme() {
return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light'
}
function applyTheme(theme) {
resolvedTheme.value = theme
document.documentElement.setAttribute('data-theme', theme)
}
function resolve() {
const theme = themeMode.value === 'auto' ? getSystemTheme() : themeMode.value
applyTheme(theme)
}
export function useTheme() {
onMounted(() => {
resolve()
// Listen for system theme changes
window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => {
if (themeMode.value === 'auto') resolve()
})
})
watchEffect(() => {
localStorage.setItem(STORAGE_KEY, themeMode.value)
resolve()
})
function setTheme(mode) {
themeMode.value = mode
}
function cycleTheme() {
const modes = ['light', 'dark', 'auto']
const idx = modes.indexOf(themeMode.value)
themeMode.value = modes[(idx + 1) % modes.length]
}
return { themeMode, resolvedTheme, setTheme, cycleTheme }
}