chayns-components/lib/utils/events/EventEmitter.js

A set of beautiful React components for developing chayns® applications.

import _classPrivateFieldLooseBase from "@babel/runtime/helpers/classPrivateFieldLooseBase";
import _classPrivateFieldLooseKey from "@babel/runtime/helpers/classPrivateFieldLooseKey";
var _events = /*#__PURE__*/_classPrivateFieldLooseKey("events");
export default class EventEmitter {
  constructor() {
    Object.defineProperty(this, _events, {
      writable: true,
      value: []
    });
    this.on = this.on.bind(this);
    this.off = this.off.bind(this);
    this.emit = this.emit.bind(this);
    this.once = this.once.bind(this);
    this.removeListener = this.removeListener.bind(this);
  }
  on(event, listener) {
    if (!_classPrivateFieldLooseBase(this, _events)[_events][event]) {
      _classPrivateFieldLooseBase(this, _events)[_events][event] = [];
    }
    _classPrivateFieldLooseBase(this, _events)[_events][event].push(listener);
    return this;
  }
  off(event, listener) {
    this.removeListener(event, listener);
    return this;
  }
  removeListener(event, listener) {
    if (_classPrivateFieldLooseBase(this, _events)[_events][event]) {
      const idx = _classPrivateFieldLooseBase(this, _events)[_events][event].indexOf(listener);
      if (idx > -1) {
        _classPrivateFieldLooseBase(this, _events)[_events][event].splice(idx, 1);
      }
    }
  }
  emit(event) {
    for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
      args[_key - 1] = arguments[_key];
    }
    if (_classPrivateFieldLooseBase(this, _events)[_events][event]) {
      _classPrivateFieldLooseBase(this, _events)[_events][event].forEach(listener => listener(...args));
    }
  }
  once(event, listener) {
    var _this = this;
    const listenerWrapper = function () {
      _this.removeListener(event, listenerWrapper);
      listener(...arguments);
    };
    this.on(event, listenerWrapper);
  }
}
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