Flex 4.5 不监听自定义 AS 类中调度的自定义事件

Question

我遇到以下情况：

我有一个事件处理程序，它在应用程序的状态栏中显示小消息。 这些消息通过从自定义组件分派事件来传递。 一条简单的消息可能类似于“HTTP 错误”等。

现在，主应用程序文件中的主事件侦听器侦听任何自定义组件分派的事件，但似乎拒绝侦听自定义 AS 类分派的事件。

这是我的自定义事件代码：

package main.events
{
    import flash.events.Event;

    public class ShowNoticeEvent extends Event
    {
        public var message:String;
        public static const SHOW_NOTICE:String = "showNotice";

        public function ShowNoticeEvent(type:String, msg:String, bubbles:Boolean = false, cancelable:Boolean = false)
        {
            super(type, bubbles, cancelable);
            this.message = msg;
        }

        override public function clone():Event
        {
            return new ShowNoticeEvent(type, message);
        }
    }
}

这是主应用程序文件中的事件侦听器：

addEventListener(ShowNoticeEvent.SHOW_NOTICE, showNoticeListener, true);

这是调度自定义事件的自定义 AS 类。我粘贴了所有代码，这样您就可以看到它的整个部分。

   package components.dashboard
{
    import components.dashboard.models.*;

    /* Event imports */
    import flash.events.*;
    import main.events.*;

    import mx.controls.Alert;
    import mx.core.UIComponent;
    import mx.rpc.events.FaultEvent;
    import mx.rpc.events.ResultEvent;
    import mx.rpc.http.HTTPService;

    [Event(name="showNotice", type="main.events.ShowNoticeEvent")]
    public class Controller extends UIComponent
    {
        private var baseUrl:String;

        public function Controller(baseUrl:String)
        {
            this.baseUrl = baseUrl;
        }

        public function getRunningQuotations():void
        {
            var runningQuotationsList:RunningQuotationsList = RunningQuotationsList.getInstance();

            execService("index.php?a=1", runningQuotationsList.updateList, "pnlRunningQuotations"); 
        }

        public function getRecentProjects():void
        {
            var recentProjectsList:RecentProjectsList = RecentProjectsList.getInstance();

            execService("index.php?a=2", recentProjectsList.updateList, "pnlRecentProjects");
        }

        public function getLatestCustomers():void
        {
            var latestCustomersList:LatestCustomersList = LatestCustomersList.getInstance();

            execService("index.php?a=3", latestCustomersList.updateList, "pnlLatestCustomers");
        }

        private function execService(url:String, listener:Function, component:String):void
        {
            var basicService:HTTPService = new HTTPService(baseUrl);
            basicService.showBusyCursor = true;
            basicService.addEventListener(FaultEvent.FAULT, function(e:FaultEvent):void{httpFault(e, component)});
            basicService.method = "POST";
            basicService.resultFormat = "text";
            basicService.url = url;
            basicService.addEventListener(ResultEvent.RESULT, listener);
            basicService.send();            
        }

        private function httpFault(event:FaultEvent, component:String = null):void {
            var faultstring:String = event.fault.faultString;
            var eventObj:ShowNoticeEvent = new ShowNoticeEvent(ShowNoticeEvent.SHOW_NOTICE, faultstring, true); 

            dispatchEvent(eventObj);
            trace(faultstring);
        }
    }
}

总结一下： - 事件侦听器侦听任何自定义组件调度的自定义事件。 - 事件侦听器不侦听 AS 类发送的自定义事件。

那些想知道的人，事件真的被调度了，这就是我添加跟踪调用的原因。

Answer 1

必须将控制器类的实例添加到舞台中才能使其正常工作。

通过

addEventListener(ShowNoticeEvent.SHOW_NOTICE, showNoticeListener, true);

在主文件中执行操作，您可以将侦听器添加到舞台中。

所以基本上您正在执行操作。

stage.addEventListener(ShowNoticeEvent.SHOW_NOTICE, showNoticeListener, true);

如果控制器实例不在舞台上，您将看不到该事件。

您可能想要研究用于数据管理的单例类型模式，因为它非常适合此设置。

Answer 2

主要的：

Controller.getLastInstance().addEventListener(ShowNoticeEvent.SHOW_NOTICE, showNoticeListener, true)

。

package components.dashboard
{
    import components.dashboard.models.*;

    /* Event imports */
    import flash.events.*;
    import main.events.*;

    import mx.controls.Alert;
    import mx.core.UIComponent;
    import mx.rpc.events.FaultEvent;
    import mx.rpc.events.ResultEvent;
    import mx.rpc.http.HTTPService;

    [Event(name="showNotice", type="main.events.ShowNoticeEvent")]
    public class Controller extends UIComponent
    {
        static public function getLastInstance():Controller { return _instance; }
        static private var _instance:Controller;
        private var baseUrl:String;

        public function Controller(baseUrl:String)
        {
            _instance = this;
            this.baseUrl = baseUrl;
        }

        public function getRunningQuotations():void
        {
            var runningQuotationsList:RunningQuotationsList = RunningQuotationsList.getInstance();

            execService("index.php?a=1", runningQuotationsList.updateList, "pnlRunningQuotations"); 
        }

        public function getRecentProjects():void
        {
            var recentProjectsList:RecentProjectsList = RecentProjectsList.getInstance();

            execService("index.php?a=2", recentProjectsList.updateList, "pnlRecentProjects");
        }

        public function getLatestCustomers():void
        {
            var latestCustomersList:LatestCustomersList = LatestCustomersList.getInstance();

            execService("index.php?a=3", latestCustomersList.updateList, "pnlLatestCustomers");
        }

        private function execService(url:String, listener:Function, component:String):void
        {
            var basicService:HTTPService = new HTTPService(baseUrl);
            basicService.showBusyCursor = true;
            basicService.addEventListener(FaultEvent.FAULT, function(e:FaultEvent):void{httpFault(e, component)});
            basicService.method = "POST";
            basicService.resultFormat = "text";
            basicService.url = url;
            basicService.addEventListener(ResultEvent.RESULT, listener);
            basicService.send();            
        }

        private function httpFault(event:FaultEvent, component:String = null):void {
            var faultstring:String = event.fault.faultString;
            var eventObj:ShowNoticeEvent = new ShowNoticeEvent(ShowNoticeEvent.SHOW_NOTICE, faultstring, true); 

            dispatchEvent(eventObj);
            trace(faultstring);
        }
    }
}

不理想，因为您只能拥有其中 1 个。
但我认为，这比将简单的 EventDispatcher 转换为 DisplayObject 并将其添加到舞台上只是为了简单地冒泡更好。