Flex中如何检测Alert控件是否closed的例子

接下来的例子演示了Flex中如何通过监听

close

事件，在静态

Alert.show()事件中指定
closeHandler的参数，来实现检测Alert控件（对话框）是否关闭。

[code]让我们先来看一下Demo（

可以右键View Source或点击这里察看源代码

）

：
下面是完整代码(或点击这里查看)：
Download: main.mxml

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white"
creationComplete="init();">

<mx:Script>
<![CDATA[
import mx.events.CloseEvent;
import mx.controls.Alert;

private var alert:Alert;

private function init():void {
Alert.buttonWidth = 100;
Alert.yesLabel += " (" + Alert.YES + ")";
Alert.noLabel += " (" + Alert.NO + ")";
Alert.okLabel += " (" + Alert.OK + ")";
Alert.cancelLabel += " (" + Alert.CANCEL + ")";
}

private function showAlert():void {
var flags:uint = 0;
if (yesCheckBox.selected) flags += Alert.YES;
if (noCheckBox.selected) flags += Alert.NO;
if (okCheckBox.selected) flags += Alert.OK;
if (cancelCheckBox.selected) flags += Alert.CANCEL;
if (nonModalCheckBox.selected) flags += Alert.NONMODAL;
alert = Alert.show("The quick brown fox jumped over the lazy dog.",
"title",
flags,
null,
alert_close);
}

private function alert_close(evt:CloseEvent):void {
arrColl.addItem(evt);
}
]]>
</mx:Script>

<mx:ArrayCollection id="arrColl" />

<mx:ApplicationControlBar dock="true">
<mx:Button label="Show alert"
click="showAlert();" />
</mx:ApplicationControlBar>

<mx:DataGrid id="dataGrid"
dataProvider="{arrColl}"
itemRenderer="mx.controls.Label"
width="100%"
height="100%" />

<mx:HBox width="100%">
<mx:CheckBox id="yesCheckBox"
label="Alert.YES"
width="20%" />
<mx:CheckBox id="noCheckBox"
label="Alert.NO"
width="20%" />
<mx:CheckBox id="okCheckBox"
label="Alert.OK"
width="20%" />
<mx:CheckBox id="cancelCheckBox"
label="Alert.CANCEL"
width="20%" />
<mx:CheckBox id="nonModalCheckBox"
label="Alert.NONMODAL"
width="20%" />
</mx:HBox>

</mx:Application>