What I meant was, I didn't want to do my sizing / positioning in a handler that's triggered by invalidateDisplayList() - which is only updateDisplayList() according to my limited knowledge, because I was worried that moving or resizing a component would trigger another invalidateDisplayList() - but it sounds like I was wrong, which is good to know =)
Does Canvas use a LayoutManager? What's it do? Is that what interprets the style information on the children such as top or horizontalCenter? I'm building a component based on Canvas that never adjusts its own measuredWidth / measuredHeight. It does only what it inherits from Canvas, and positions all children and sets their width and height explicitly based on its own dimenisions. Based on how I'm interpreting your post, I shouldn't be overriding measure at all, and move my child-position code into invalidateDisplayList()? It's working fine now, but I hate doing things the wrong way ;-) I tell you what, I'd sell my left nut for some flow charts of how a well behaved complex component behaves, showing when invalidateXXX() is flagged, and what determines whether or not things are invalidated. Does anything that detailed exist? Would people out there find it useful if I take a few hours to work on a preliminary one over the weekend? I know there's a few "lifecycle of a component" articles, but I'm thinking of something more verbose. -J On Wed, May 14, 2008 at 1:58 PM, Alex Harui <[EMAIL PROTECTED]> wrote: > Measure() is called on Canvas as well because a Canvas's > measuredWidth/Height are dictated by the position and size of its children. > > > > You should always measure your children in the measure() method, and > position them in updateDisplayList. Anything you do in creationComplete can > cause something to be invalidated and cause another pass of > commitProperties/measure/updateDisplayList. > > > > I'm not sure what you mean by "attached to invalidateDisplayList". It is > possible to create invalidation loops where by the time we finish > validating, something is invalidated again. > > > ------------------------------ > > *From:* [email protected] [mailto:[EMAIL PROTECTED] *On > Behalf Of *Josh McDonald > *Sent:* Tuesday, May 13, 2008 5:54 PM > *To:* [email protected] > *Subject:* Re: [flexcoders] Quick question - who calls > UIComponent.measure()? > > > > If it's in a container that uses a LayoutManager (not Canvas IIRC), and if > the component in question isn't of a fixed size. > > If you need to measure and position stuff in a component that's not always > of a fluid size, you need to move your code into another method, and call it > both from measure() and on CreationComplete and whenever you add a > component. > > I'm not sure if it could be attached to invalidateDisplayList somehow, in > case you do something that triggers an endless loop ;-) It's something I'll > look into when I have more time, as I'm doing all my component adding in > createChildren() and haven't had to deal with post CreationComplete changes. > > Alex, please correct me if I'm wrong in there somewhere, too! > > -J > > On Wed, May 14, 2008 at 10:18 AM, Mansour Raad <[EMAIL PROTECTED]> wrote: > > Question - is it part of the lifecycle of the component ? > > Mansour > :-) > > > > -----Original Message----- > From: [email protected] <flexcoders%40yahoogroups.com> on behalf > of Alex Harui > Sent: Tue 5/13/2008 8:07 PM > To: [email protected] <flexcoders%40yahoogroups.com> > > Subject: RE: [flexcoders] Quick question - who calls UIComponent.measure()? > > It is called by LayoutManager via validateSize() > > ________________________________ > > From: [email protected] <flexcoders%40yahoogroups.com> [mailto: > [email protected] <flexcoders%40yahoogroups.com>] On > Behalf Of Josh McDonald > Sent: Tuesday, May 13, 2008 4:33 PM > To: [email protected] <flexcoders%40yahoogroups.com> > Subject: [flexcoders] Quick question - who calls UIComponent.measure()? > > Hey guys, > > Since UIComponent.measure() is protected, does the container invoke it > via a round-about way, or is it simply called from a ResizeEvent.RESIZE > handler somewhere in UIComponent? > > -J > > -- > "Therefore, send not to know For whom the bell tolls. It tolls for > thee." > > :: Josh 'G-Funk' McDonald > > :: 0437 221 380 :: [EMAIL PROTECTED] <josh%40gfunk007.com> <mailto: > [EMAIL PROTECTED] <josh%40gfunk007.com>> > > > > > -- > "Therefore, send not to know For whom the bell tolls. It tolls for thee." > > :: Josh 'G-Funk' McDonald > :: 0437 221 380 :: [EMAIL PROTECTED] > > > -- "Therefore, send not to know For whom the bell tolls. It tolls for thee." :: Josh 'G-Funk' McDonald :: 0437 221 380 :: [EMAIL PROTECTED]
