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https://issues.apache.org/jira/browse/FLEX-16964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13648972#comment-13648972
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Justin Mclean commented on FLEX-16964:
--------------------------------------
Still an "issue" in Apache Flex 4.9 - should be worth looking into as potential
for performance increase.
> HaloBorder performance issue
> ----------------------------
>
> Key: FLEX-16964
> URL: https://issues.apache.org/jira/browse/FLEX-16964
> Project: Apache Flex
> Issue Type: Improvement
> Components: Skinning
> Affects Versions: Adobe Flex SDK 3.0 (Release)
> Environment: Language Found: English
> Reporter: Adobe JIRA
>
> Steps to reproduce:
> 1. Create a canvas and add a child.
> 2. Add logic to move or resize the child.
> 3. Run
> 4. Turn show redraw regions on.
> 5. Now move or resize the child.
>
> Actual Results:
> It redraws the complete canvas
>
> Expected Results:
> It should redraw only the changes.
>
> Workaround (if any):
> Create a new skin by inheriting it from HaloBorder, like this (see
> [adjustment]):
> ========================
> package
> {
> import mx.skins.halo.HaloBorder;
> import mx.core.mx_internal;
> use namespace mx_internal;
> public class FixedHaloBorder extends HaloBorder
> {
> public function FixedHaloBorder()
> {
> super();
> }
> protected var prevWidth:Number;
> protected var prevHeight:Number;
> override protected function updateDisplayList(w:Number, h:Number):void
> {
> if (isNaN(w) || isNaN(h)) return;
> // Store background color in an object,
> // so that null is distinct from black.
> backgroundColor = getBackgroundColor();
> bRoundedCorners = false;
> backgroundAlphaName = "backgroundAlpha";
> backgroundHole = null;
> radius = 0;
> radiusObj = null;
> // [adjustment] We should only draw the border and background
> when the size has changed.
> if(prevWidth != w || prevHeight != h)
> {
> drawBorder(w,h);
> drawBackground(w,h);
> prevWidth = w;
> prevHeight = h;
> }
> }
>
> /**
> * @private
> * If borderStyle may have changed, clear the cached border metrics.
> */
> override public function styleChanged(styleProp:String):void
> {
> super.styleChanged(styleProp);
> // [adjustment] We have to set backgroundColor explicitly to
> workaround another bug.
> backgroundColor = getStyle("backgroundColor");
>
> // [adjustment] We should draw the border and background when a
> style has changed.
> drawBorder(width,height);
> drawBackground(width,height);
> }
> }
> }
> ========================
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