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Vue 2.x plugin to detect dark mode and make a reactive property describing the current mode available to all components of your app
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export default function Plugin(Vue) { | |
/** | |
Installing in your app root: | |
import DarkMode from './path/to/this/code.js'; | |
Vue.use(DarkMode); | |
Usage in your components: | |
<div v-if="$darkMode.isDark">...</div> | |
-or- | |
if(this.$darkMode.isDark) { | |
... | |
} | |
*/ | |
// an object to encapsulate observate state and the update method | |
const darkMode = { | |
// make it reactive! | |
state: Vue.observable({ | |
// default mode is light | |
isDark: false, | |
isLight: true | |
}), | |
update(event) { | |
// mutate the observable props | |
if (event.matches) { | |
darkMode.state.isDark = true; | |
darkMode.state.isLight = false; | |
} else { | |
darkMode.state.isDark = false; | |
darkMode.state.isLight = true; | |
} | |
} | |
} | |
// only bother checking for dark mode if the browser supports it. | |
if (window.matchMedia) { | |
// the media query to match | |
const darkQuery = '(prefers-color-scheme: dark)'; | |
darkMode.update(window.matchMedia(darkQuery)); | |
window.matchMedia(darkQuery) | |
.addEventListener('change', darkMode.update); | |
} | |
// expose just the observable props the app's components | |
Vue.prototype.$darkMode = darkMode.state; | |
} |
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