63 lines
1.5 KiB
JavaScript
63 lines
1.5 KiB
JavaScript
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const DARK = "dark"
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const LIGHT = "light"
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const SYSTEM = "system"
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const DEFAULT_THEME = SYSTEM
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const parseTheme = (themeName) => {
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const s = (typeof (themeName) === 'string') ? themeName.toLowerCase().trim() : themeName
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if (s == "light" || s == LIGHT) return LIGHT
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else if (s == "dark" || s == DARK) return DARK
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else return SYSTEM
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}
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const oppositeOf = (theme) => {
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if (theme == LIGHT) return DARK
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else if (theme == DARK) return LIGHT
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else return null
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}
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export class Theme {
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#theme = DEFAULT_THEME
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#defaultPreference = LIGHT
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constructor(initialThemeName = undefined) {
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if (!initialThemeName) initialThemeName = localStorage.getItem("theme")
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this.#defaultPreference = window.matchMedia("(prefers-color-scheme: light)").matches ? LIGHT : DARK
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this.theme = parseTheme(initialThemeName)
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}
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cycle() {
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this.theme = this.getNext()
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}
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getNext() {
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if (this.theme == SYSTEM) {
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return oppositeOf(this.#defaultPreference)
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} else {
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if (this.theme == this.#defaultPreference) {
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return SYSTEM
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} else {
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return oppositeOf(this.#theme)
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}
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}
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}
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toggle() {
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// unused on this page
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}
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set theme(themeName) {
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localStorage.setItem("theme", themeName)
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this.#theme = parseTheme(themeName)
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document.body.classList.remove(`light-theme`)
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document.body.classList.remove(`dark-theme`)
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document.body.classList.remove(`system-theme`)
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document.body.classList.add(`${this.#theme}-theme`)
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}
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get theme() {
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return this.#theme
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}
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}
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