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// Darkmode Listener
enum SystemDarkmodePrefrence {
dark = 0,
light = 1
};
class DarkmodeListener {
private _mode: SystemDarkmodePrefrence;
private _handlers: ((mode: SystemDarkmodePrefrence)=>void)[];
public constructor() {
let darking = window.matchMedia('(prefers-color-scheme: dark)').matches;
this._mode = darking ? SystemDarkmodePrefrence.dark : SystemDarkmodePrefrence.light;
this._handlers = [];
this._listen();
}
private _listen(): void {
let media = window.matchMedia('(prefers-color-scheme: dark)');
let callback = (event: MediaQueryListEvent) => {
let mode = event.matches ? SystemDarkmodePrefrence.dark : SystemDarkmodePrefrence.light;
this._handlers.forEach(handler => {
handler(mode);
});
this._mode = mode;
};
media.addEventListener("change", callback);
}
public add(callback: (mode: SystemDarkmodePrefrence)=>void): void {
this._handlers.push(callback);
}
public mode(): SystemDarkmodePrefrence {
return this._mode;
}
};
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