eventscope.js

(function(ng) {
  'use strict';

  if (typeof module !== "undefined" && typeof exports !== "undefined" && module.exports === exports){
    module.exports = 'tenphi.eventscope';
  }

  ng.module('tenphi.eventscope', [])
    .factory('EventScope', () => {
      let listeners = {};

      class EventScope {
        constructor($scope) {
          if ($scope) {
            this.$scope = $scope;
          }
        }

        emit(eventName, ...args) {
          if (listeners[eventName]) {
            for (let listener of listeners[eventName]) {
              listener(...args);
            }
          }

          if (this.$scope) {
            this.$scope.$digest();
          }

          return this;
        }

        remove(eventName, listener) {
          if (listeners[eventName]) {
            listeners[eventName].delete(listener);
          }

          return this;
        }

        removeAll(eventName) {
          if (listeners[eventName]) {
            listeners[eventName] = new Set;
          }

          return this;
        }

        on(eventName, listener) {
          if (!listeners[eventName]) {
            listeners[eventName] = new Set;
          }

          listeners[eventName].add(listener);

          if (this.$scope) {
            this.$scope.$on('$destroy', () => {
              listeners[eventName].delete(listener);
            });
          }

          return this;
        }
      }

      return EventScope;
    });

})(window.angular);