应用IMXMLObject自定义功能性组件
在flex项目中,应用到非显示的功能性组件,一种方法是直接定义actionScript类。另外一种方法是实现IMXMLObject接口。实现IMXMLObject接口的好处,是可以直接调用功能函数。
IMXMLObject中的方法function initialized(document:Object, id:String):void,在IMXMLObject置入MXML时被直接调用,类似于触发了initialized事件。如以下示例:
TempCom.as
import flash.display.Shape;
import mx.core.IMXMLObject;
public class TempCom implements IMXMLObject{
public var id:String="tempCom";
public var rect:Shape;
public var paramOne:String="paramOne";
public var paramTwo:String="paramTwo";
public function executSome(para1:String,para2:String):void{
trace("para1:->"+para1,"para2:->"+para2,"from executSome");
}
public function initialized(document:Object, id:String):void
{
rect=createShape();
executSome(paramOne,paramTwo);
}
private function createShape():Shape{
var rect:Shape=new Shape;
rect.graphics.beginFill(0xffccff);
rect.graphics.drawRect(0,0,100,100);
rect.graphics.endFill();
return rect;
}
}
}
MainApp.mxml
<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"
xmlns:com="component.*"
xmlns:mxmlCom="mxmlCom.*"
minWidth="955" minHeight="600"
creationComplete="application1_creationCompleteHandler(event)">
<fx:Script>
<![CDATA[
import mx.events.FlexEvent;
protected function application1_creationCompleteHandler(event:FlexEvent):void
{
container.addChild(tempCom.rect);
}
]]>
</fx:Script>
<fx:Declarations>
<com:TempCom id="tempCom" paramOne="aaa" paramTwo="bbbb"/>
</fx:Declarations>
<mx:UIComponent id="container"/>
</s:Application>
运行结果会显示出一个正方形,并输出:" para1:->aaa para2:->bbbb from executSome ".