RE: [flexcoders] Re: How can I add a child element to an AreaSeries based on the render data?

[Ely Greenfield]

Hi Mark.  I would make your child creation code cache regardless of circularity reasons, for performance concerns.  I don't believe adding a child automatically invalidates your display list. I'm pretty sure it _does_ invalidate measurement, which then _potentially_ invalidates display. But the built in series classes won't invalidate their display due to a measurement.   Ely.       From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Mark Sent: Thursday, September 14, 2006 9:43 AM To: flexcoders@yahoogroups.com Subject: [flexcoders] Re: How can I add a child element to an AreaSeries based on the render data? Thanks for your response Ely. Is there any concern with a circular reference? What I mean is if I call addChild in updateDisplayList that will call invalidateDisplayList, which will ultimately call updateDisplayList again, right? If I make my child creation code conditional (so that it only runs the first time I go through updateDisplayList) will that be enough to avoid the loop? thanks, Mark Haugen --- In [EMAIL PROTECTED]ups.com, "Ely Greenfield" <[EMAIL PROTECTED].> wrote: > > > > > Hi Mark. createChildren() is the right place for a compnent to create > 'static' children. But dynamic children...i.e. children that are created > or destroyed based on some runtime information, like amount of data, > size on screen, etc...need to be created elsewhere. > > In general, I would reccomend custom components create/destroy dynamic > children in their commitProperties() function. This is because > adding/removing children usually means the component needs to be > re-measured. Doing it in commitProperties means you do it before any > pending measurement happens, and don't end up with unnecessary extra > measurement passes. > > Charts, however, don't have a natural measured size. So the various > series types create and destroy their children as necessary in their > updateDisplayList() function. At that point, you can be sure your data > is all up to date. > > Ely. > > > ________________________________ > > From: [EMAIL PROTECTED]ups.com [mailto:[EMAIL PROTECTED]ups.com] On > Behalf Of Mark > Sent: Thursday, September 14, 2006 8:46 AM > To: [EMAIL PROTECTED]ups.com > Subject: [flexcoders] How can I add a child element to an AreaSeries > based on the render data? > > > > I'm creating an AreaChart that has labels inside each area. Very few > of the series will be large enough to display a label so for > performance reasons I only want to add labels to those that are big > enough. It seems to me that the best place to create and add the > label is in createChildren(), however in examining the renderData, the > filterCache is null and all the bounds values in the cache are NaN. > Where would be the best place to add the label (as far as performance > goes)? > > Thanks in advance for any help. > > Mark Haugen > __._,_.___ -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com SPONSORED LINKS Software development tool Software development Software development services Home design software Software development company Your email settings: Individual Email|Traditional Change settings via the Web (Yahoo! ID required) Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe __,_._,___