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events.ts
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events.ts
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import { removeFromList } from './util.js';
/**
* Single event listener/emitter, listen to, and trigger events. (for mapped events use {@link CMappedEvent}).
*
* @example
* ```ts
* const evt = new CEvent<bool>();
* evt.listen(listener);
* evt.dispatch(true);
* evt.remove(listener);
* ```
*/
export class CEvent<T> {
protected _listeners: Array<(data: T | undefined) => void> = [];
listen(fn: (data?: T) => void) {
this._listeners.push(fn);
}
remove(fn: (data?: T) => void) {
removeFromList(fn, this._listeners);
// console.log(fn, this._listeners, removed);
}
dispatch(data?: T) {
this._listeners.forEach((el) => el(data));
}
destroy() {
this._listeners = [];
}
}
/**
* Mapped event listener/emitter, listen to, and trigger events. (for single events use {@link CEvent}).
*
* @example
* ```ts
* const evt = new CMappedEvent<bool>();
* evt.listen('evt', listener);
* evt.dispatch('evt', true);
* evt.remove('evt', listener);
* ```
*/
export class CMappedEvent<T> {
private _listeners: Record<string, Array<(data?: T) => void>> = {};
listen(evt: string, fn: (data?: T) => void) {
if (!(evt in this._listeners)) {
this._listeners[evt] = [fn];
}
else if (this._listeners[evt]) {
this._listeners[evt].push(fn);
}
}
remove(evt: string, fn: (data?: T) => void) {
removeFromList(fn, this._listeners[evt]);
}
dispatch(evt: string, data?: T) {
if (evt in this._listeners) {
this._listeners[evt].forEach((el) => el(data));
}
}
destroy() {
this._listeners = {};
}
}
export const singleEvent = <T>() => {
return new CEvent<T>();
};
export const mappedEvent = <T>() => {
return new CMappedEvent<T>();
};