Question

我有以下情况：

我有一个事件处理程序，它在我的应用程序的状态栏中显示小消息。通过从自定义组件调度事件来传递这些消息。一条简单的消息可能就像“HTTP错误”一样。

现在，主应用程序文件中的主事件侦听器侦听由任何自定义组件调度的事件，但似乎拒绝侦听由自定义AS类调度的事件。

以下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，因此您可以看到整个代码。

   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： - 事件侦听器侦听由任何自定义组件调度的自定义事件。 - 事件侦听器不侦听由AS类调度的自定义事件。

那些怀疑，事件真的被派遣，这就是我添加跟踪调用的原因。

Answer 1

必须将Controller Class的实例添加到舞台才能使其工作。

做

addEventListener(ShowNoticeEvent.SHOW_NOTICE, showNoticeListener, true);

在主文件中，您将监听器添加到舞台。

所以基本上你在做。

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。

您可能希望为数据管理调查Singleton类型模式，因为这样可以很好地适应此设置。

Answer 2

主：

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，因为你只能拥有其中的一个。但我认为最好不要将一个简单的EventDispatcher转换为DisplayObject，并将其添加到舞台上，只需简单地冒泡即可。

Flex 4.5不侦听在自定义AS类中调度的自定义事件

2 个答案: