Setting truncateToFit on Label in Tree

I have a tree component sitting in a divided box. I want to display '...' on the node labels if the divided box is resized. I have a custom itemrenderer and have been looking at the labelFunction property as well as trying various approaches in the custom itemrenderer. Not having any joy. Any pointers would be apprecia开发者_开发百科ted.

heres some sample code fo how I set it up...

I define a tree...

<mx:Tree 
id="tree"
dataProvider="myData" 
labelFunction="treeNodeLabel"
width="100%" height="100%"
click="handleClick(event)"
mouseMove="handleMouseMove(event)"
itemRollOver="handleItemOver(event)"
itemRollOut="handleItemOut(event)"
doubleClickEnabled="true"
doubleClick="handleDoubleClick(event)"
iconFunction="customIcon"
dragEnabled="true"
dropEnabled="true"
dragMoveEnabled="true"
dragOver="onDragOver(event)"
dragStart="onDragStart(event)"
dataDescriptor="{new DiagramTreeDataDescriptor()}"
itemRenderer="myCustomeRenderer"
borderStyle="none"
>

The Custom Renderer is an Actionscript class that extends TreeItemRenderer...

public class myCustomRenderer extends TreeItemRenderer {

public function myCustomRenderer() {
  super();
}

/**
 * Create child objects of the component.
 */
override protected function createChildren():void {
  super.createChildren();
  createIcon(); 
  addListeners();
  addChild(Icon1); 
  addChild(Icon2); 
} 


private function createIcon() : void {
   ...
}

private function addListeners() : void {
   ...
}

private function Icon1Click(event: MouseEvent):void {
   ...              
}

private function Icon2Click(event: MouseEvent): void {
   ...
}  

private function onLabelMouseOver(event : MouseEvent):void {
   ...
}

private function onLabelMouseOut(event : MouseEvent):void {
   ...
}

private function getDescription(node : XML):String  {  
   ...            
}

override protected function updateDisplayList(...) {
   ...
} 

override public function set listData(value:BaseListData):void  { 
   ...
} 

}

You can set

labelDisplay.maxDisplayedLines = 1

Also, to be able to truncate, the labelDisplay must have a specified width. I don't know what's the default behavior inside a renderer. You can try to first set a width on the renderer itself (absolute or in percentage). If it does not work, set it on the labelDisplay.