1、ModuleLoader
在Asp.Net开发中，经常会把页面的公共部分封装成自定义控件ascx，以达到重用或动态加载的目的。在Flex4中MXML Module能达到类似的功能，可以把某些功能单独封装成在一个Module，然后利用ModuleLoader动态加载。
每个MXML Module在Build时，会生成一个同名的swf(比如A.mxml会生成A.swf)，但是不能单独运行。
然后在主界面的mxml中，利用ModuleLoader组件来加载，示例代码如下：
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="400" minHeight="300" xmlns:ns1="*">
<s:layout>
<s:BasicLayout/>
</s:layout>
<fx:Script>
<![CDATA[
import mx.controls.Alert;
import mx.events.ModuleEvent;
protected function btnLoad_clickHandler(event:MouseEvent):void
{
mLoader.loadModule("ModuleStu.swf");
}
protected function mLoader_loadingHandler(event:Event):void
{
trace("加载中...");
}
protected function mLoader_readyHandler(event:ModuleEvent):void
{
trace("加载完成!");
}
]]>
</fx:Script>
<mx:ModuleLoader id="mLoader" right="10" top="10" left="10" bottom="40" loading="mLoader_loadingHandler(event)" ready="mLoader_readyHandler(event)">
</mx:ModuleLoader>
<s:Button label="Load" id="btnLoad" click="btnLoad_clickHandler(event)" bottom="10" horizontalCenter="0"/>
</s:Application>
不过Module加载后，并不象Asp.Net中的ascx那样好控制（也许仅仅只是我目前功力不够）
2、Alert以及TitleWindow
在应用程序中通过弹窗来显示一些消息，是常用的手段。Alert及TitleWindow能满足这种要求
弹出窗口LoginWindow.mxml (创建时 New-->MXML Component，Base on 这里选择spark.components.TitleWindow)
<?xml version="1.0" encoding="utf-8"?>
<s:TitleWindow xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" width="334" height="146" title="请输入微薄内容" close="doClose()">
<s:layout>
<s:BasicLayout/>
</s:layout>
<fx:Script>
<![CDATA[
//引入需要的包
import mx.managers.PopUpManager;
import mx.controls.Alert;
import mx.events.CloseEvent;
import spark.components.TextArea;
private var _txtContent:TextArea;
public function get txtContent():TextArea
{
return _txtContent;
}
public function set txtContent(value:TextArea):void
{
_txtContent = value;
}
private function doClose():void
{
Alert.yesLabel = "是";
Alert.noLabel = "否";
Alert.show("确定要退出吗？", "提示", Alert.YES|Alert.NO, this, alertClickHandler);
}
private function alertClickHandler(evt:CloseEvent):void {
if (evt.detail == Alert.YES) {
//关闭自身
PopUpManager.removePopUp(this);
}
}
private function doSend():void
{
if (txtMsg.text.length>0){
//在关闭窗口前，给父窗口中的相关文本框赋值（注：这要求在父窗口中调用时，得按约定传递txtContent的引用）
txtContent.text = txtMsg.text;
}
//关闭自身
PopUpManager.removePopUp(this);
}
]]>
</fx:Script>
<s:TextArea x="10" y="11" width="312" height="61" id="txtMsg"/>
<s:Button x="131" y="84" label="发 送" id="btnSend" click="doSend()"/>
</s:TitleWindow>
调用的主窗口TitleWindowDemo.mxml
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx">
<fx:Script>
<![CDATA[
import mx.managers.PopUpManager;
private function showWindow():void
{
var _loginWin:LoginWindow = PopUpManager.createPopUp(this,LoginWindow,true) as LoginWindow;
PopUpManager.centerPopUp(_loginWin);
//给弹出窗口的txtContent传递引用
_loginWin.txtContent = this.txtResult;
}
]]>
</fx:Script>
<s:TextArea top="10" left="10" right="10" bottom="40" id="txtResult" editable="false"/>
<s:Button label="发微薄" horizontalCenter="0" bottom="10" id="btnWrite" click="showWindow()"/>
</s:Application>
