@soundstep/soma/src/emitter.js

Soma is a javascript framework created to build scalable and maintainable applications.

import Signal from 'signals';
import utils from './utils';

const Emitter = function() {
    this.signals = {};
};

Emitter.prototype.addListener = function(id, handler, scope, priority) {
    if (!this.signals[id]) {
        this.signals[id] = new Signal();
    }
    return this.signals[id].add(handler, scope, priority);
};

Emitter.prototype.addListenerOnce = function(id, handler, scope, priority) {
    if (!this.signals[id]) {
        this.signals[id] = new Signal();
    }
    return this.signals[id].addOnce(handler, scope, priority);
};

Emitter.prototype.removeListener = function(id, handler, scope) {
    const signal = this.signals[id];
    if (signal) {
        signal.remove(handler, scope);
    }
};

Emitter.prototype.getSignal = function(id) {
    return this.signals[id];
};

Emitter.prototype.dispatch = function(id, args) {
    const signal = this.signals[id];
    if (signal) {
        if (args) {
            signal.dispatch.apply(signal, args);
        } else {
            signal.dispatch();
        }
    }
};

Emitter.prototype.dispose = function() {
    for (const id in this.signals) {
        this.signals[id].removeAll();
        this.signals[id] = undefined;
        delete this.signals[id];
    }
    this.signals = {};
};

Emitter.extend = function(obj) {
    return utils.inherit(Emitter, obj);
};

export default Emitter;