How can I force a tree itemrenderer to redraw during a drag and drop operation?
- by swidnikk
I have a tree control with a custom item renderer. The item renderer has different states that should be set while an item is being dragged over the item renderer. I understand from reading this post http://forums.adobe.com/message/2091088 that the 'right way' to do this is to override the 'getCurrentState' method and append some text. I do that.
Now in my tree control I handle the drag over event and get a reference to the itemrenderer that is being dragged over and I set the boolean 'dragOver' property to true. Now I just need to force my itemRenderer to redraw. I can't figure that out. A workaround, is to just set the currentState of the itemRenderer.
My question then, how can I force my itemRenderer to refresh? (and I've tried calling validateNow, invalideDisplayList/Properties/Size, to no avail)
<?xml version="1.0" encoding="utf-8"?>
<s:MXTreeItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx">
<fx:Script>
<![CDATA[
import mx.events.DragEvent;
import mx.events.FlexEvent;
import spark.layouts.supportClasses.DropLocation;
public var dragOver:Boolean = false;
override protected function getCurrentRendererState():String
{
var skinState:String = super.getCurrentRendererState();
if( dragOver )
skinState += "AndDragOver";
trace('getCurrentRendererState', skinState);
return skinState;
}
]]>
</fx:Script>
<s:states>
<s:State name="normal" />
<s:State name="hovered" />
<s:State name="selected" />
<s:State name="normalAndDragOver" stateGroups="dragOverGroup" />
<s:State name="hoveredAndDragOver" stateGroups="dragOverGroup" />
<s:State name="selectedAndDragOver" stateGroups="dragOverGroup" />
</s:states>
...
