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import { Injectable, Renderer2, RendererFactory2 } from '@angular/core';
import { MediaMatcher } from '@angular/cdk/layout';
import { LocalStorage } from 'ngx-webstorage';
type ColorScheme = "dark" | "light";
@Injectable({
providedIn: 'root'
})
export class ColorSchemeService {
private renderer: Renderer2;
matcher!: MediaQueryList;
@LocalStorage('prefers-color-scheme')
public colorSchemeOverride: ColorScheme;
public activeColorScheme: BehaviorSubject<ColorScheme> = new BehaviorSubject("light");
constructor(rendererFactory: RendererFactory2,
mediaMatcher: MediaMatcher
) {
// Create new renderer from renderFactory, to make it possible to use renderer2 in a service
this.renderer = rendererFactory.createRenderer(null, null);
this.matcher = mediaMatcher.matchMedia('(prefers-color-scheme: dark)');
this._listener = this._listener.bind(this);
}
init() {
this.matcher.addEventListener('change', this._listener);
this.load();
}
_listener(event: { matches: any; }) {
this.activeColorScheme.next(event.matches ? 'dark' : 'light');
}
destroy() {
this.matcher.removeEventListener('change', this._listener);
}
_getColorScheme() {
if (this.colorSchemeOverride) {
this.colorSchemeOverride
} else {
this.matcher.matches ? 'dark' : 'light'
}
}
load() {
this.activeColorScheme.next(this._getColorScheme());
}
update(scheme: ColorScheme) {
this.colorSchemeOverride = scheme;
this.activeColorScheme.next(scheme);
}
currentActive() {
return this.colorScheme;
}
}
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