如何显示没有顶层窗口的警告框？

Question

Adobe AIR提供了Alert.show()。然而，如果没有像典型的托盘示例(“示例:创建没有窗口的应用程序”)中的顶级窗口，这似乎是失败的：

http://livedocs.adobe.com/flex/3/html/taskbar_1.html

在这种情况下，我无法使Alert.show()工作。似乎也没有alert()。

在这种情况下，有没有办法在不重新发明轮子的情况下显示警报提示(模式或非模式)？

空气托盘应用程序框架示例：

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/mx"
                       windowComplete="init(event)" visible="false">
 <fx:Script>
  <![CDATA[
   import flash.events.InvokeEvent;

   import mx.controls.Alert;
   import mx.events.CloseEvent;

   import mx.events.AIREvent;

   // As windows does not work without icon, we MUST embed it.
   // Stories told differently on the net are void.
   [Embed(source="icons/AIRApp_16.png")]  private var img16:Class;
   [Embed(source="icons/AIRApp_32.png")]  private var img32:Class;
   [Embed(source="icons/AIRApp_48.png")]  private var img48:Class;
   [Embed(source="icons/AIRApp_128.png")] private var img128:Class;

   private function helloworld(evt:Event):void {
    //This does not work
    Alert.show("hello world");
   }

   private function closer(e:CloseEvent):void
   {
    if (e.detail == Alert.YES) {
     NativeApplication.nativeApplication.icon.bitmaps = [];
     NativeApplication.nativeApplication.exit();
    }
   }

   private function doexit(event:Event):void {
    //This does not work either
    Alert.show("Really?","Exit application", Alert.YES | Alert.NO | Alert.NONMODAL, null, closer, null, 3);
   }

   protected function init(event:AIREvent):void {

    NativeApplication.nativeApplication.autoExit = false;

    var iconMenu:NativeMenu = new NativeMenu();

    var exitCommand:NativeMenuItem = iconMenu.addItem(new NativeMenuItem("Exit"));
    exitCommand.addEventListener(Event.SELECT, doexit);

    NativeApplication.nativeApplication.icon.bitmaps = [new img16, new img32, new img48, new img128];

    if (NativeApplication.supportsSystemTrayIcon) {

     var systray:SystemTrayIcon = NativeApplication.nativeApplication.icon as SystemTrayIcon;
     systray.tooltip = "Monitor Application";
     systray.menu = iconMenu;
     systray.addEventListener(ScreenMouseEvent.CLICK, helloworld);

    } else if (NativeApplication.supportsDockIcon) {

     var dock:DockIcon = NativeApplication.nativeApplication.icon as DockIcon;
     dock.menu = iconMenu;
     NativeApplication.nativeApplication.addEventListener(InvokeEvent.INVOKE, helloworld);
    }
   }

  ]]>
 </fx:Script>
 <fx:Declarations>
  <!-- Platzieren Sie nichtvisuelle Elemente (z. B. Dienste, Wertobjekte) hier -->
 </fx:Declarations>
</s:WindowedApplication>

请注意"visible=false“，即使这是导致问题的原因，也必须保留它。

Answer 1

不是的。在Air和Flex中，应用程序都是您的根级对象。所有警报都必须是该对象的子级。如果父对象具有visible=false，则看不到任何子对象。

抱歉的。

您是否考虑过在调用Alert.show()之前将可见性设置为true？