Flex界面之间的参数传递

Question

我想做一个用户登入界面，正确登入后，要拿到刚才用户登入时输入的用户名。
主界面： APPlication.mxml
[code="xml"]<?xml version="1.0" encoding="utf-8"?>
creationComplete="initFrame()">
mx:Script
<![CDATA[
import mx.controls.Alert;
public function initFrame():void{
(new User()).showModal();

         }

     ]]>
 </mx:Script>

/mx:Application[/code]
登入框：User.mxml
[code="xml"]<?xml version="1.0" encoding="utf-8"?>
xmlns:flexmdi="flexmdi.containers.*" title="会员登入" layout="absolute" width="336" height="232"
minButtonVisible="false" maxButtonVisible="false" closeButtonVisible="false" creationComplete="initUser()" fontSize="20" borderColor="#FF0000">
mx:Script
<![CDATA[
import mx.controls.Alert;
import mx.events.CloseEvent;
import mx.events.CloseEvent
public function initUser():void {

         }
         public function checkUser():void {
             if(uname.text=="" || upass.text==""){
                 Alert.show("请输入用户名和密码",null,1);
             }else if(uname.text == upass.text){
             // do something and then close the login frame
                closeWindow();
               // (new MemberLogin()).showModal();
             } else {
                 Alert.show("用户名或者密码不正确", null, 1);
             }    
         }
         public function isQuit():void{
            Alert.show("Seriously? Close it?", null, 3, null, handleAlertResponse);
         }
        public function handleAlertResponse(event:CloseEvent):void
        {
            if(event.detail == mx.controls.Alert.YES)
            {
                closeWindow();

            }
        }
      ]]>
 </mx:Script>
<flexmdi:MDICanvas id="mdiCanvas" horizontalScrollPolicy="off" verticalScrollPolicy="off"
        width="296" height="168" backgroundColor="#FFFFFF" backgroundAlpha="0" x="10" y="10">
    <mx:Label x="23" y="28" text="会员号码:" width="97" fontSize="16"/>
    <mx:Label x="23" y="75" text="密码:" fontSize="16" width="74"/>
    <mx:TextInput id="uname" x="128" y="26" fontSize="16"/>
    <mx:TextInput id="upass" x="128" y="73" fontSize="16" fontFamily="Times New Roman" width="160"/>
    <mx:Button id="uexit" x="160" y="130" label="放弃" click="isQuit()" themeColor="#18FF00" fontSize="16"/>
    <mx:Button x="50" y="130" label="登入" click="checkUser()" themeColor="#18FF00" fontSize="16"/>
</flexmdi:MDICanvas>

[/code]

我想在主界面中拿到用户输入的用户名，这里是User.mxml中的uname这个的Text值。
所以我想知道怎么样才可以把Text值传到 APPlication.mxml中。
可以的话，麻烦你举个例子啊，谢谢

Answer 1

通过自定义事件来解决
自定义一个LoginEvent事件
[code="java"]
package events
{
import flash.events.Event;

public class LoginEvent extends Event
{
    public var username:String;
    public var password:String;

    public function LoginEvent(type:String, username:String, password:String)
    {
        super(type);
        this.username = username;
        this.password = password;
    }

}

}
[/code]
然后在登入框：User.mxml 中当登陆成功之后就dispatch自定义的事件,我这里帮你写个例子
[code="xml"]
<?xml version="1.0" encoding="utf-8"?>

<mx:Metadata>
    [Event(name="login",type="events.LoginEvent")] 
</mx:Metadata>
<mx:Script>
    <![CDATA[
        import events.LoginEvent;
        private function clickHandler(event:Event):void
        {
            var e:LoginEvent = new LoginEvent("login",username.text,password.text);
            dispatchEvent(e);
        }
    ]]>
</mx:Script>

<mx:Label x="10" y="35" text="UserName:"/>
<mx:Label x="10" y="61" text="Password:"/>
<mx:TextInput x="97" y="33" id="username"/>
<mx:TextInput x="97" y="59" displayAsPassword="true" id="password"/>
<mx:Button x="97" y="100" label="Login" click="clickHandler(event)"/>

/mx:Panel

[/code]
然后主的APPlication,mxml中就能监听到User.mxml发出的login事件
[code="xml"]
<?xml version="1.0" encoding="utf-8"?>

mx:Script
<![CDATA[

    import events.LoginEvent;

    import mx.controls.Alert;

    public function loginHandler(event:LoginEvent):void
    {  

        Alert.show("You logged in with username "+event.username,"Login Successful");
    }
]]>  

/mx:Script

/mx:Application
[/code]