Question

我在Flex Mobile应用程序项目中。我需要向FlexGlobals.topLevelApplication调度一个事件，它必须包含一个自定义消息。

我正在尝试创建一个对象，然后像这样发送它：

//create the event Object

var receivedObjMsg:Object = new Object();
receivedObjMsg.name = "receivedMessage";
receivedObjMsg.message = messagevarhere;

FlexGlobals.topLevelApplication.dispatchEvent(receivedObjMsg);

然后像这样在另一个视图上接收它：

FlexGlobals.topLevelApplication.addEventListener("receivedMessage", receiveMsgHandler);


protected function receiveMsgHandler(event:Event):void
{
trace("IT WORKED!");
}

但是它说它不能把一个对象变成一个事件：

Type Coercion failed: cannot convert Object@5a507911 to flash.events.Event.

我也尝试将它放在我创建事件的主应用程序mxml的底部;

<fx:Metadata>
[Event(name="receivedMessage", type="flash.events.Event")]
</fx:Metadata>

我似乎无法找到一个展示我想要做的事情的例子。我有什么想法可以让它发挥作用吗？

Answer 1

dispatchEvent需要Event

创建自己的扩展Event的类，然后发送它。

查看讨论如何分发自定义事件的this article。

class MyOwnEvent extends Event
{
    public static const RECEIVED_EVENT:String = "receivedEvent";
    public string name;
    public string message;

    public MyOwnEvent (type:String, bubbles:Boolean = false, cancelable:Boolean = false)
    {

    }

}

当你想发送它时。

var myevent:MyOwnEvent = new MyOwnEvent(MyOwnEvent.RECEIVED_EVENT);
myevent.name = "whatever";
myevent.message = "another whatever";
FlexGlobals.topLevelApplication.dispatchEvent(myevent);

从topLevelApplication中，确保您侦听同一事件。

FlexGlobals.topLevelApplication.addEventListener(MyOwnEvent.RECEIVED_EVENT, receiveMsgHandler);

在receiveMsgHandler中选择MyOwnEvent类型的对象。

protected function receiveMsgHandler(event:MyOwnEvent):void
{
    trace(event.name);
    trace(event.message);
}

Answer 2

dispachEvent()只接受Event个对象。您需要制作自己的课程ReceivedObjMsg。

有关在previous question of yours上的答案中创建自己的课程的详细信息。

您的问题基本上就在这里：

var receivedObjMsg:Object = new Object();
receivedObjMsg.name = "receivedMessage";
receivedObjMsg.message = messagevarhere;

FlexGlobals.topLevelApplication.dispatchEvent(receivedObjMsg);

解析Object到dispatchEvent()

自定义Flash / Flex事件对象

2 个答案: