Method dispatch

src/common/overlay/levelRenderer/Eventful.js:148–187

* @function LevelRenderer.Eventful.prototype.dispatch * @description 事件分发。 * @param {string} type - 事件类型。 * @returns {LevelRenderer.Eventful} this

(type)

     * @returns {LevelRenderer.Eventful} this
     */
    dispatch(type) {
        if (this._handlers[type]) {
            var args = arguments;
            var argLen = args.length;

            if (argLen > 3) {
                args = Array.prototype.slice.call(args, 1);
            }

            var _h = this._handlers[type];
            var len = _h.length;
            for (var i = 0; i < len;) {
                // Optimize advise from backbone
                switch (argLen) {
                    case 1:
                        _h[i]['h'].call(_h[i]['ctx']);
                        break;
                    case 2:
                        _h[i]['h'].call(_h[i]['ctx'], args[1]);
                        break;
                    case 3:
                        _h[i]['h'].call(_h[i]['ctx'], args[1], args[2]);
                        break;
                    default:
                        // have more than 2 given arguments
                        _h[i]['h'].apply(_h[i]['ctx'], args);
                        break;
                }

                if (_h[i]['one']) {
                    _h.splice(i, 1);
                    len--;
                } else {
                    i++;
                }
            }
        }

        return this;
    }


    /**