Flex 3：如何訪問組件的孫子們

Question

我需要訪問topBox的孫子們，並確定它們是否是按鈕。

下面的這個函數（謝謝你Flextras.com）抓住了topBox的直接孩子，這是HBox。如何降低topBox的孫輩一級？或者唯一的方法是在每個HBox上運行這個函數？

for (var i : int =0; i<topBox.numChildren; i++){ 
  var child : DisplayObject = topBox.getChildAt(i); 
    var myButton:UIComponent = child as UIComponent; 
  blah blah    
} 


<mx:VBox id="topBox"> 

    <mx:HBox id="Hbox1"> 
     <mx:Button id="button1" 
      label="button1" 
      click="myClickHandler"/> 

     <mx:Button id="button2" 
      label="button2" 
      click="myClickHandler"/> 
    </mx:HBox> 

    <mx:HBox id="Hbox2"> 
     <mx:Button id="button3" 
      label="button3" 
      click="myClickHandler"/> 

     <mx:Button id="button4" 
      label="button4" 
      click="myClickHandler"/> 
    </mx:HBox> 

<mx:VBox> 

Answer 1

//declare child access function 
private function processChildren(target:DisplayObjectContainer, handler:Function):void 
{ 
    for (var i:int = target.numChildren - 1; i >= 0; i--) 
    { 
     handler(target.getChildAt(i)); 
    } 
} 

//call it with handler as anonymous function (may be plain one as well) 
processChildren(topBox, function(target:DisplayObjectContainer):void 
    { 
     processChildren(target, function(target:DisplayObjectContainer):void 
     { 
      //this will be called on grandchildren 
      if (target is Button) 
      { 
       //do something 
      } 
     }); 
    }); 

，使它看起來那麼嚇人，可以用普通的人代替匿名函數，但這個想法應該是清楚的。