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https://issues.apache.org/jira/browse/FLEX-32642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13478065#comment-13478065
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Maurice Amsellem commented on FLEX-32642:
-----------------------------------------
So the solution could be to hide unmapped child, instead of removing them.
In the code above, replace the if statement by:
if (isNaN(left) || isNaN(right) || isNaN(top) || isNaN(bottom))
{
p.visible = false;
continue;
}
else {
p.visible = true
}
> CartesianDataCanvas added childs do not persist in the _childMap dictionary
> ---------------------------------------------------------------------------
>
> Key: FLEX-32642
> URL: https://issues.apache.org/jira/browse/FLEX-32642
> Project: Apache Flex
> Issue Type: Bug
> Components: Charts
> Affects Versions: Adobe Flex SDK Previous
> Environment: Affected OS(s): Windows
> Language Found: English
> Reporter: Adobe JIRA
>
> Steps to reproduce:
> 1. Add a chart item using CartesianDataCanvas.addDataChild(...) method in a
> initialize event handler.
> 2. update the chart item using CartesianDataCanvas.updateDataChild(...)
> method in a creationComplete event handler.
>
> Actual Results:
> updateDataChild throws null reference exception.
>
> Expected Results:
> updateDataChild should not throw null reference exception.
>
> Workaround (if any):
> update the chart item using CartesianDataCanvas.updateDataChild(...) right
> after addDataChild(...) method.
> It also seems that if the addDataChild is supplied with some combination of
> the coordinate points, it seems ok, but not with defaults which are nulls.
> By looking at the code, the _childMap being instantiated with weak reference
> dictionary may cause this issue in the constructor?
> _childMap = new Dictionary(true);
> But then, looking into the code of the class reveals that the dictionary
> management seems to be quite convoluted...
> As an example, the code segment below seems to be somewhat confusing?
> public function addDataChild(child:DisplayObject,left:* = undefined,
> top:* = undefined, right:* = undefined,
> bottom:* = undefined , hCenter:* =
> undefined, vCenter:* = undefined):void
> {
> var dc:CartesianDataChild = new
> CartesianDataChild(child,left,top,right,bottom);
> dc.addEventListener("change",dataChildChangeHandler,false,0,true);
> addChild(child);
> updateDataChild(child,left,top,right,bottom,hCenter,vCenter);
> invalidateOpCodes();
> }
>
> override public function addChild(child:DisplayObject):DisplayObject
> {
> var dc:CartesianDataChild = new CartesianDataChild(child);
> _childMap[child] = dc;
> _dataChildren.push(dc);
> dc.addEventListener("change",dataChildChangeHandler,false,0,true);
> invalidateOpCodes();
> return super.addChild(child);
> }
> addDataChild calls addChild, and dc is created in each methods with the same
> event handler installed to each instance?
> Seems to me that making the dictionary with no weak reference and monitoring
> the dictionary content carefully will reveal some issues.
> Ensuring only one CartesianDataChild is instantiated and managed in the
> dictionary for each added chart item will be good.
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