gaea-render/dist/src/event-system/index.js

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));

var _createClass2 = _interopRequireDefault(require("@babel/runtime/helpers/createClass"));

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

var EventAction =
/*#__PURE__*/
function () {
  function EventAction() {
    (0, _classCallCheck2.default)(this, EventAction);
    // 所有事件
    this.events = new Map();
  }
  /**
   * 订阅事件
   */


  (0, _createClass2.default)(EventAction, [{
    key: "on",
    value: function on(eventType, callback, context) {
      var event = {
        callback: callback,
        context: context
      };

      if (this.events.get(eventType)) {
        // 存在, push 一个事件监听
        this.events.get(eventType).push(event);
      } else {
        // 不存在, 赋值
        this.events.set(eventType, [event]);
      }
    }
    /**
     * 取消订阅
     */

  }, {
    key: "off",
    value: function off(eventType, callback) {
      if (!this.events.get(eventType)) {
        return false;
      }

      var events = this.events.get(eventType).filter(function (event) {
        return event.callback !== callback;
      });
      this.events.set(eventType, events);
      return true;
    }
    /**
     * 广播事件
     */

  }, {
    key: "emit",
    value: function emit(eventType, context) {
      if (!eventType || !this.events.get(eventType)) {
        return false;
      }

      this.events.get(eventType).forEach(function (event) {
        event.callback(event.context, context);
      });
    }
  }]);
  return EventAction;
}();

exports.default = EventAction;