motion/node_modules/sb-event-kit/lib/emitter.js

motion - moving development forward

'use strict';
'use babel';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.Emitter = undefined;

var _disposable = require('./disposable');

class Emitter {
  constructor() {
    this.disposed = false;
    this.handlers = {};
  }
  dispose() {
    this.disposed = true;
    this.handlers = null;
  }
  on(eventName, handler) {
    var _this = this;

    if (this.disposed) {
      throw new Error('Emitter has been disposed');
    }
    if (typeof handler !== 'function') {
      throw new Error('Event handler must be a function');
    }
    if (typeof this.handlers[eventName] === 'undefined') {
      this.handlers[eventName] = [handler];
    } else {
      this.handlers[eventName].push(handler);
    }
    return new _disposable.Disposable(function () {
      _this.off(eventName, handler);
    });
  }
  off(eventName, handler) {
    if (this.disposed || typeof this.handlers[eventName] === 'undefined') {
      return;
    }
    const index = this.handlers[eventName].indexOf(handler);
    if (index !== -1) {
      this.handlers[eventName].splice(index, 1);
    }
  }
  clear() {
    this.handlers = [];
  }
  emit(eventName) {
    for (var _len = arguments.length, params = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
      params[_key - 1] = arguments[_key];
    }

    if (this.disposed || typeof this.handlers[eventName] === 'undefined') {
      return;
    }
    const paramsLength = params.length;
    this.handlers[eventName].forEach(function (callback) {
      if (paramsLength === 1) {
        callback(params[0]);
      } else if (paramsLength === 2) {
        callback(params[0], params[1]);
      } else if (paramsLength === 3) {
        callback(params[0], params[1], params[2]);
      } else if (paramsLength === 4) {
        callback(params[0], params[1], params[2], params[3]);
      } else if (paramsLength === 5) {
        callback(params[0], params[1], params[2], params[3], params[4]);
      } else {
        callback.apply(undefined, params);
      }
    });
  }
}
exports.Emitter = Emitter;