Signal.js

"use strict";

class Signal {

	constructor() {
		this._callbacks = new Map();
	}

	add(fnc) {
		this._callbacks.set(fnc, {count:0});
		return fnc;
	}

	once(fnc) {
		this._callbacks.set(fnc, {count:1});
		return fnc;
	}

	times(count, fnc) {
		this._callbacks.set(fnc, {count});
		return fnc;
	}

	dispatch() {
		for(let entry of this._callbacks) {
			entry[0]();
			if (--entry[1].count === 0) {
				this._callbacks.delete(entry[0]);
			}
		}
	}

	remove(fnc) {
		this._callbacks.delete(fnc);
	}

	removeAll() {
		this._callbacks.clear();
	}
}

window.dm = window.dm || {};
dm.Signal = Signal;