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import React from "react";
import { Observable, Subject } from "rxjs";
// This error is thrown when ui goes wrong with bad logic.
// Such as a variable should not be null, but it does.
// This error should never occur. If it does, it indicates there is some logic bug in codes.
export class UiLogicError extends Error {}
export function useEventEmiiter(): [() => Observable<null>, () => void] {
const ref = React.useRef<Subject<null> | null>(null);
return React.useMemo(() => {
const getter = (): Subject<null> => {
if (ref.current == null) {
ref.current = new Subject<null>();
}
return ref.current;
};
const trigger = (): void => {
getter().next(null);
};
return [getter, trigger];
}, []);
}
export function useValueEventEmiiter<T>(): [
() => Observable<T>,
(value: T) => void
] {
const ref = React.useRef<Subject<T> | null>(null);
return React.useMemo(() => {
const getter = (): Subject<T> => {
if (ref.current == null) {
ref.current = new Subject<T>();
}
return ref.current;
};
const trigger = (value: T): void => {
getter().next(value);
};
return [getter, trigger];
}, []);
}
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