What is the proper way to set the icon from a TreeItemRenderer when
using an embeded graphic file? I don't want to accidentally create
hundreds of instances of it in memory. TreeItemRenderer.icon is an
instance of IFlexDisplayObject which is implemented by BitmapDataAsset
(the embedded graphic class). When I do the following:
public class MyTreeItemRenderer extends TreeItemRenderer
{
[Embed(source="../../assets/test.jpg")]
public var testIcon:Class;
public function MyTrereItemRenderer() {
super();
}
// Override the updateDisplayList() method
// to set the text for each tree node.
override protected function
updateDisplayList(unscaledWidth:Number,
unscaledHeight:Number):void {
super.updateDisplayList(unscaledWidth, unscaledHeight);
this.icon = new studentIcon();
}
}
I get this RTE:
ArgumentError: Error #2025: The supplied DisplayObject must be a child
of the caller.
at flash.display::DisplayObjectContainer/removeChild()
at
mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::$remo
veChild()
at mx.core::UIComponent/removeChild()
at
mx.controls.treeClasses::TreeItemRenderer/commitProperties()
at mx.core::UIComponent/validateProperties()
at mx.managers::LayoutManager/validateClient()
at mx.controls::List/makeRowsAndColumns()
at
mx.controls.listClasses::ListBase/makeRowsAndColumnsWithExtraRows()
at mx.controls.listClasses::ListBase/updateDisplayList()
at mx.controls::List/updateDisplayList()
I can't seem to find a good example of a TreeItemRenderer on the web
that uses the icon field to control the icon.
Dave
