[转]flex中Popup窗口访问父窗口的4种方法以及相互传值

1.如果使用MVC框架，相信这并不是一个问题。而如果没有使用的话，可以用类似的方法设置一个单例，子窗口和父窗口通过这个单例来交互消息，如果需要解耦，请发送自定义事件。总之，只要按照MVC思路来做就可以了。
2.类似JS，在子窗口的构造函数里增加一个参数，将父窗口传参进去。MXML没有构造函数，用一个属性来保存父窗口引用也可以。
3.无论是createPopUp还是addPopUp，他们都有一个返回值，得到子窗口的实例。可以对这个实例监听remove事件，并在这个事件中直接读取子窗口需要返回给父窗口的属性。（记得要将这个事件最终移除）

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"> <mx:Panel x="94" y="178" width="503" height="347" layout="absolute"> <mx:TextInput x="134" y="64" id="tit_usr" text="username"/> <mx:TextInput x="134" y="125" id="tit_psw" text="password"/> <mx:Button x="171" y="209" label="Submit" click="mytw_click()"/> </mx:Panel> <mx:Script> <!--[CDATA[ import mx.containers.TitleWindow; import mx.managers.PopUpManager; import mx.controls.Text; private var tw:titlewindow=new titlewindow(); private function mytw_click():void{ if(tw.visible){ PopUpManager.removePopUp(tw); } PopUpManager.addPopUp(tw,this); PopUpManager.centerPopUp(tw); tw.addEventListener("tw_click",update); } private function update(event:Event):void{ tit_usr.text=tw.tw_usr.text; tit_psw.text=tw.tw_psw.text; PopUpManager.removePopUp(tw); } ]]--> </mx:Script> </mx:Application>

弹出窗口：

<mx:TitleWindow xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="498" height="368" showCloseButton="true" close="PopUpManager.removePopUp(this)"> <mx:Label x="96" y="67" text="username" width="97" height="26"/> <mx:Label x="96" y="128" text="password" width="97" height="24"/> <mx:TextInput x="217" y="65" id="tw_usr"/> <mx:TextInput x="217" y="126" id="tw_psw"/> <mx:Button x="228" y="239" label="Click" click="btn_click()"/> <mx:Script> <!--[CDATA[ import mx.managers.PopUpManager; import mx.controls.Text; private function btn_click():void{ dispatchEvent(new Event("tw_click")); } ]]--> </mx:Script></mx:TitleWindow>

4.owner property   
owner:DisplayObjectContainer  [read-write]
The owner of this UIComponent. By default, it is the parent of thisUIComponent. However, if this UIComponent object is a childcomponent that is popped up by its parent, such as the dropdownlist of a ComboBox control, the owner is the component that poppedup this UIComponent object.
This property is not managed by Flex,but by each component. Therefore, if you use thePopUpManger.createPopUp() or PopUpManger.addPopUp() method to popup a child component, you should set the owner property of thechild component to the component that popped it up.
The default value is the value of the parent property.

我也不翻译了--说真的我看到了感觉很囧。owner这个属性在Popup中没有用途，因此，可以在创建窗口的时候将子窗口的owner设置成父窗口（也就是当时的this），然后子窗口访问自己的owner属性即可。

父窗口代码:PopUpDemo.mxml

<mx:Applicationxmlns:mx="http://www.adobe.com/2006/mxml"layout="absolute">
 <mx:Panel x="94" y="178"width="503" height="347" layout="absolute">
  <mx:TextInput x="134" y="64"id="tit_usr" text="username"/>
  <mx:TextInput x="134" y="125"id="tit_psw" text="password"/>
  <mx:Button x="171" y="209"label="Submit" click="mytw_click()"/>
 </mx:Panel>
 <mx:Script>
  <![CDATA[
 import mx.containers.TitleWindow;
 import mx.managers.PopUpManager;
 import mx.controls.Text;
 
 private var tw:titlewindow=newtitlewindow();
 
 private function mytw_click():void{
 
  tw.owner = this;
  PopUpManager.addPopUp(tw,this);
  PopUpManager.centerPopUp(tw);
 
 }
 
  ]]>
 </mx:Script>
 
</mx:Application>

弹出窗口代码:titlewindow.mxml

<mx:TitleWindowxmlns:mx="http://www.adobe.com/2006/mxml"layout="absolute" width="498" height="368" showCloseButton="true"close="PopUpManager.removePopUp(this)">

 

<mx:Label x="96" y="67"text="username" width="97" height="26"/>
 <mx:Label x="96" y="128"text="password" width="97" height="24"/>
 <mx:TextInput x="217" y="65"id="tw_usr"/>
 <mx:TextInput x="217" y="126"id="tw_psw"/>
 <mx:Button x="228" y="239"label="Click" click="btn_click()"/>
 <mx:Script>
  <![CDATA[
   importmx.controls.Alert;
 import mx.managers.PopUpManager;
 import mx.controls.Text;
 
 private function btn_click():void{
  //dispatchEvent(new Event("tw_click"));
  var a:PopUpDemo = this.owner as PopUpDemo;
  a.tit_usr.text = this.tw_usr.text;
  a.tit_psw.text = this.tw_psw.text;
  PopUpManager.removePopUp(this);
 }
  ]]>
 </mx:Script>
 
</mx:TitleWindow>