hpg-r3f-model-scene/es/common/event-emitter.js

Pretty Footer react component used in ant.design

import _typeof from "@babel/runtime/helpers/esm/typeof";
import _classCallCheck from "@babel/runtime/helpers/esm/classCallCheck";
import _createClass from "@babel/runtime/helpers/esm/createClass";
import { pull } from 'lodash';
/*这个就是事件的原型*/
var EventEmitter = /*#__PURE__*/function () {
  function EventEmitter() {
    _classCallCheck(this, EventEmitter);
    this._events = void 0;
    this._events = {};
  }
  _createClass(EventEmitter, [{
    key: "_getFns",
    value: function _getFns(event) {
      return this._events[event] || (this._events[event] = []);
    }
  }, {
    key: "on",
    value: function on(event, cb) {
      var fns = this._getFns(event);
      fns.push(cb);
    }
  }, {
    key: "off",
    value: function off(event, cb) {
      if (cb) {
        var fns = this._getFns(event);
        pull(fns, cb);
      } else {
        delete this._events[event];
      }
    }
  }, {
    key: "once",
    value: function once(event, cb) {
      var _this = this;
      var fn2 = function fn2(e) {
        _this.off(event, fn2);
        cb(e);
      };
      this.on(event, fn2);
    }
    /* 同步调用 */
  }, {
    key: "emit",
    value: function emit(event, param) {
      var fns = this._getFns(event);
      for (var i = 0; i < fns.length; i++) {
        var fn = fns[i];
        fn(param);
      }
    }
    /* 可以异步调用，返回一个Promise */
  }, {
    key: "invoke",
    value: function invoke(event, param) {
      var fns = this._getFns(event);
      var _loop = function _loop() {
        var fn = fns[i];
        return {
          v: new Promise(function (resolve, reject) {
            resolve(fn(param));
          })
        };
      };
      flag: for (var i = 0; i < fns.length; i++) {
        var _ret = _loop();
        if (_typeof(_ret) === "object") return _ret.v;
      }
      return Promise.reject();
    }
  }]);
  return EventEmitter;
}();
export default EventEmitter;