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import { action, computed, makeObservable, observable } from 'mobx';
export enum ThemePreference {
System,
PreferLight,
PreferDark,
}
export default class ThemeStore {
preference = ThemePreference.System;
systemDarkMode: boolean;
constructor() {
const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
this.systemDarkMode = mediaQuery.matches;
mediaQuery.addEventListener('change', (event) => {
this.systemDarkMode = event.matches;
});
makeObservable(this, {
preference: observable,
systemDarkMode: observable,
darkMode: computed,
toggleDarkMode: action,
});
}
get darkMode(): boolean {
switch (this.preference) {
case ThemePreference.PreferLight:
return false;
case ThemePreference.PreferDark:
return true;
default:
return this.systemDarkMode;
}
}
toggleDarkMode(): void {
if (this.darkMode) {
this.preference = this.systemDarkMode
? ThemePreference.PreferLight
: ThemePreference.System;
} else {
this.preference = this.systemDarkMode
? ThemePreference.System
: ThemePreference.PreferDark;
}
}
}
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