57 lines
1.6 KiB
TypeScript
57 lines
1.6 KiB
TypeScript
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export type Theme = 'dark' | 'light'
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const STORAGE_KEY = 'viewer.theme'
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const listeners = new Set<(theme: Theme) => void>()
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export function initTheme(): Theme {
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const isAndroidShell =
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typeof (window as unknown as { AndroidViewer?: unknown }).AndroidViewer !== 'undefined'
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let theme: Theme = 'dark'
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try {
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const stored = localStorage.getItem(STORAGE_KEY)
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if (stored === 'light' || stored === 'dark') {
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theme = stored
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} else if (!isAndroidShell && window.matchMedia?.('(prefers-color-scheme: light)').matches) {
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theme = 'light'
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}
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} catch {
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/* ignore */
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}
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applyTheme(theme, false)
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return theme
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}
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export function getTheme(): Theme {
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return document.documentElement.dataset.theme === 'light' ? 'light' : 'dark'
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}
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export function setTheme(theme: Theme): void {
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applyTheme(theme, true)
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}
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export function toggleTheme(): Theme {
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const next: Theme = getTheme() === 'dark' ? 'light' : 'dark'
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setTheme(next)
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return next
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}
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function applyTheme(theme: Theme, persist: boolean): void {
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document.documentElement.dataset.theme = theme
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document.documentElement.style.colorScheme = theme
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const meta = document.querySelector('meta[name="theme-color"]')
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if (meta) meta.setAttribute('content', theme === 'dark' ? '#0b0e14' : '#f2f5fa')
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if (persist) {
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try {
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localStorage.setItem(STORAGE_KEY, theme)
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} catch {
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/* ignore */
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}
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}
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for (const listener of listeners) listener(theme)
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}
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export function onThemeChange(listener: (theme: Theme) => void): () => void {
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listeners.add(listener)
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return () => listeners.delete(listener)
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}
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