88 lines
2.5 KiB
TypeScript
88 lines
2.5 KiB
TypeScript
type colorScheme = 'light' | 'dark' | 'auto';
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class StackColorScheme {
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private localStorageKey = 'StackColorScheme';
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private currentScheme: colorScheme;
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private systemPreferScheme: colorScheme;
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constructor(toggleEl: HTMLElement) {
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this.bindMatchMedia();
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this.currentScheme = this.getSavedScheme();
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this.dispatchEvent(document.documentElement.dataset.scheme as colorScheme);
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if (toggleEl)
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this.bindClick(toggleEl);
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if (document.body.style.transition == '')
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document.body.style.setProperty('transition', 'background-color .3s ease');
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}
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private saveScheme() {
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localStorage.setItem(this.localStorageKey, this.currentScheme);
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}
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private bindClick(toggleEl: HTMLElement) {
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toggleEl.addEventListener('click', (e) => {
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if (this.isDark()) {
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/// Disable dark mode
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this.currentScheme = 'light';
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}
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else {
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this.currentScheme = 'dark';
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}
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this.setBodyClass();
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if (this.currentScheme == this.systemPreferScheme) {
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/// Set to auto
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this.currentScheme = 'auto';
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}
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this.saveScheme();
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})
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}
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private isDark() {
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return (this.currentScheme == 'dark' || this.currentScheme == 'auto' && this.systemPreferScheme == 'dark');
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}
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private dispatchEvent(colorScheme: colorScheme) {
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const event = new CustomEvent('onColorSchemeChange', {
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detail: colorScheme
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});
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window.dispatchEvent(event);
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}
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private setBodyClass() {
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if (this.isDark()) {
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document.documentElement.dataset.scheme = 'dark';
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}
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else {
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document.documentElement.dataset.scheme = 'light';
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}
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this.dispatchEvent(document.documentElement.dataset.scheme as colorScheme);
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}
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private getSavedScheme(): colorScheme {
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const savedScheme = localStorage.getItem(this.localStorageKey);
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if (savedScheme == 'light' || savedScheme == 'dark' || savedScheme == 'auto') return savedScheme;
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else return 'auto';
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}
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private bindMatchMedia() {
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window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', (e) => {
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if (e.matches) {
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this.systemPreferScheme = 'dark';
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}
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else {
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this.systemPreferScheme = 'light';
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}
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this.setBodyClass();
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});
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}
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}
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export default StackColorScheme;
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