Method triggerEvent

src/common/commontypes/Events.js:355–393

* @function Events.prototype.triggerEvent * @description 触发一个特定的注册事件。 * @param {string} type - 触发事件类型。 * @param {Event} evt - 事件对象。 * @returns {Event|boolean} 监听对象，如果返回是 false，则停止监听。

(type, evt)

     * @returns {Event|boolean} 监听对象，如果返回是 false，则停止监听。
     */
    triggerEvent(type, evt) {
        var listeners = this.listeners[type];

        // fast path
        if (!listeners || listeners.length == 0) {
            return undefined;
        }

        // prep evt object with object & div references
        if (evt == null) {
            evt = {};
        }
        evt.object = this.object;
        evt.element = this.element;
        if (!evt.type) {
            evt.type = type;
        }

        // execute all callbacks registered for specified type
        // get a clone of the listeners array to
        // allow for splicing during callbacks
        listeners = listeners.slice();
        var continueChain;
        for (var i = 0, len = listeners.length; i < len; i++) {
            var callback = listeners[i];
            // bind the context to callback.obj
            continueChain = callback.func.apply(callback.obj, [evt]);

            if ((continueChain != undefined) && (continueChain === false)) {
                // if callback returns false, execute no more callbacks.
                break;
            }
        }
        // don't fall through to other DOM elements
        if (!this.fallThrough) {
            Event.stop(evt, true);
        }
        return continueChain;
    }


    /**