Rollover button causing everything to redraw

I'm having a problem with my Flex application.  It seems that roll over a button causes my custom to redraw component.  What causes all button rollovers to be very slow.  This can be seen in the attached graph - it shows cooling boxes that occur when the mouse is over the button named "foo".

RedrawArea.PNG


So my question is, why not roll on this cause of any other button design?  They do not overlap.  How can I limit the refresh?

I copied the code to a simplified version of the application that shows the problem.

<? XML version = "1.0" encoding = "utf-8"? >
< mx:Application
' xmlns:mx = ' http://www.Adobe.com/2006/MXML "
xmlns:CC = "components.*".
layout = "horizontal".
applicationComplete = "stage.invalidate ()" >

< mx:VBox
Width = "100" >
< mx:Button
ID = "fooButton".
label = "foo".
Click = "stage. Invalidate().
/ >
< / mx:VBox >

< mx:Spacer width = "5" / >
< cc:TestComponent
ID = "testCanvas".
Width = '100% '.
Height = "100%".
/ >
< / mx:Application >

Here is a simple component that displays the question:


package components
{
import flash.events.Event;

Import mx.core.UIComponent;

SerializableAttribute public class TestComponent extends UIComponent
{
public void TestComponent()
{
Super();

addEventListener (Event.RENDER, onRender);
}

private void onRender(theEvent:Event):void
{
this.graphics.lineStyle (1.0, 0x000000);
graphics.beginFill (0xFEFEFE);
graphics.drawEllipse (1,1,width-2,height-2);
graphics.endFill ();
}
}
}

This LiveDocs page gives a good description of some important aspects of the creation of components and a description of the component lifecycle:

http://livedocs.Adobe.com/Flex/3/HTML/Help.HTML?content=ascomponents_advanced_2.html

If this post helps, please mark it as such.

Tags: Flex

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