The column is the .data. data.headerText should work.
________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Douglas Knudsen Sent: Saturday, March 24, 2007 12:14 PM To: [email protected] Subject: Re: [flexcomponents] Re: datagrid header with checkbox when creating a custom header renderer, what is in the data property? Can things be added? how? I tried using data.headerText but got nothing. Ben, thanks for your notes for sure. Creating a itemRender for a DG is not so painful really. Creating the headerRenderer is where things don't seem the same approach. DK On 23 Mar 2007 20:54:08 -0700, ben.clinkinbeard <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> > wrote: Hi Alex, Re-reading it now, I see that my sentence about the data setter isn't very clear. I suppose its not a case of 'must' or 'always', but any time I've created or seen renderers that use a control of some sort to represent a piece of data, overriding the data setter is necessary to ensure consistent results when scrolling. I was thinking mostly of CheckBox renderers in DataGrids since thats what I've encountered most often, but I would venture to guess that it holds true for other controls like ComboBox, Label, etc in things like Lists as well as DataGrids. For whatever reason, the list-based controls don't seem to be able to re-apply proper values/states on the itemRenderers when the scrolling initiates the recycling of displayed items. That is, since it reuses the same graphical assets and simply swaps the data for each item when the list is scrolled, binding the control to a value isn't enough to keep checked items checked, and unchecked items unchecked. If I am just dense and have missed an easier way to do things I would certainly appreciate any advice you can provide. Also, if need be I can try to throw together a quick example to demonstrate the erratic behavior I described. Thanks, Ben --- In [email protected] <mailto:flexcomponents%40yahoogroups.com> , "Alex Harui" <[EMAIL PROTECTED]> wrote: > > Ben, I'm not aware of a rule that you must override the .data setter. > Can you explain further? > > > > -Alex > > > > ________________________________ > > From: [email protected] <mailto:flexcomponents%40yahoogroups.com> > [mailto:[email protected] <mailto:flexcomponents%40yahoogroups.com> ] On Behalf Of ben.clinkinbeard > Sent: Friday, March 23, 2007 5:48 PM > To: [email protected] <mailto:flexcomponents%40yahoogroups.com> > Subject: [flexcomponents] Re: datagrid header with checkbox > > > > Hi Douglas, > > If you look in the docs, you'll see that itemRenderers (and > itemEditors) are the primary use cases for ClassFactory. In fact, when > you say something like <mx:List id="myList" > itemRenderer="ProductRenderer">, the compiler actually creates a > ClassFactory instance for you behind the scenes. Explicitly creating > the ClassFactory instance simply allows you to use the properties > property, which is the key to making a reusable renderer. Further > evidence of the correlation is that the itemRenderer and itemEditor > properties are of type IFactory, which is what ClassFactory implements. > > I don't want you to think I'm being defensive, its just that > itemRenderers seem to be a topic that comes up repeatedly as a pain > point for developers. I think if people had a better understanding of > how they worked (especially the rule that you MUST override the data > setter method), people could avoid a lot of headaches. > > The post I wrote prior to the one Darron referenced actually shows how > to create a renderer in what I guess is the more traditional method > (itemRenderer="MyRendererClass"), so that may be of help to you. > However, the reason I initially began investigating ClassFactory was > because of problems I was having getting a CheckBox to function as a > headerRenderer. For reasons still unknown to me, headerRenderers seem > to fire events extremely frequently, which caused difficulty getting > it to respond to user interaction in a predictable way. > > Let me know if you have any other questions or concerns about > renderers (and/or my approach to them) and I will do my best to help. > > Thanks, > Ben > > --- In [email protected] <mailto:flexcomponents%40yahoogroups.com> > <mailto:flexcomponents%40yahoogroup s.com <http://s.com> > , "Douglas Knudsen" > <douglasknudsen@> wrote: > > > > thanks, been reading that. Seems like this approach is way off the > > direction normally taken for renderers though, eh? Not to knock Ben > mind > > you. Can add checkboxes to a datagrid cell with out that, correct? > So why > > not headers? > > > > oh...answering my other question...headers are rendered by > > DataGridItemRenderer by default according to the docs. > > > > DK > > > > On 23 Mar 2007 13:31:04 -0700, Darron J. Schall <darron@> > > wrote: > > > > > > Check out > > > > > > > http://www.returnundefined.com/2006/11/creating-truly-reusable-renderers <http://www.returnundefined.com/2006/11/creating-truly-reusable-renderer s> > -with-classfactory/ > <http://www.returnundefined.com/2006/11/creating-truly-reusable-renderer <http://www.returnundefined.com/2006/11/creating-truly-reusable-renderer > > s-with-classfactory/> > > > > > > -d > > > > > > > > > Douglas Knudsen wrote: > > > > > > > > How the heck to get a checkbox in the header of a data grid, eh? > Let > > > > me re-phrase that some...a workable checkbox. I can create a > custom > > > > renderer in AS to put one there, but can't click it at all. Anyone > > > > have a example or a nudge? > > > > > > > > -- > > > > Douglas Knudsen > > > > http://www.cubicleman.com <http://www.cubicleman.com> < http://www.cubicleman.com <http://www.cubicleman.com> > > <http://www.cubicleman.com <http://www.cubicleman.com> < http://www.cubicleman.com <http://www.cubicleman.com> > > > > > > this is my signature, like it? > > > > > > > > > > > > > > > > > > > > > > > > > -- > > Douglas Knudsen > > http://www.cubicleman.com <http://www.cubicleman.com> < http://www.cubicleman.com <http://www.cubicleman.com> > > > this is my signature, like it? > > > -- Douglas Knudsen http://www.cubicleman.com <http://www.cubicleman.com> this is my signature, like it?
