How many TextInputs are going to be on screen at once? Why do you need editability in all cells? See my blog (blogs.adobe.com/aharui) for examples of lightweight renderers
________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of letterpigeon Sent: Monday, November 19, 2007 3:12 PM To: [email protected] Subject: [flexcoders] Re: Performance Impact when using custom item renderer Hi Scott, Thanks for your post. But I'm on flex 2 now so the AdvancedDataGridItemRenderer is not available to me. Also, in terms of keeping the item renderer as light weight as possible, my item renderer is just a TextInput and I change its background color by calling this.styleName = "ErrorCell" where "ErrorCell" is defined in my stylesheet. But even if I comment all this out, & have my item renderer just to renderer the text, I'm still seeing a considerable performance hit just by using custom item renderers on all the columns of my datagrid. Is this a limitation in flex that we must trade off performance for using custom renderers heavily?? Thanks. Ban --- In [email protected] <mailto:flexcoders%40yahoogroups.com> , Scott Melby <[EMAIL PROTECTED]> wrote: > > Check out this post <http://blog.fastlanesw.com/?p=25 <http://blog.fastlanesw.com/?p=25> > on my blog where > I discuss and demonstrate performance diffs using various item renderers > in Flex. Source code is available if you run the app and right click. > Notice how the optimized renderer does not use layout containers such as > HBox, etc. Instead it extends the AdvancedDataGridItemRenderer class. > In general you want to make your renderers as light weight as possible. > > hth > Scott > > Scott Melby > Founder, Fast Lane Software LLC > http://www.fastlanesw.com <http://www.fastlanesw.com> > > > > letterpigeon wrote: > > > > Hi all, > > > > I'm seeing a huge performance degradation while using custom item > > renderer with a datagrid. My datagrid is using a custom item renderer > > for all its column. And even if my item renderer does nothing more > > than : > > > > public override function data(value:object) > > { > > super.data = value; > > } > > > > I'm still seeing a few more seconds delay compared to not using custom > > item renderers for a data set of 50 rows or more. > > > > Just wondering if this is a known issue with flex due to heavy graphic > > rendering? Any pointers on how to speed things up a little bit? Thanks. > > > > Ban > > > > >
