Hi Scott and Alex, Thanks for all your help. I adopted Alex's example of the backgroundColorRenderer and it worked really well. So now I'm using this lightweight for most of the columns in my datagrid except 2, which are both hbox'es. One to display a checkbox, and another one to display an image along side with the text. What components/classes do you think should be used to further improve performance? Thanks.
Ban --- In [email protected], Scott Melby <[EMAIL PROTECTED]> wrote: > > Ban - > > I don't think TextInput is nearly as lightweight as you might think. Do > you really need them all to be editable at all times? Typically I use a > lightweight itemrenderer derived from UIComponent etc. and use a > separate itemEditor (TextInput, ComboBox, DateField), etc. when the user > clicks on a particular data value (row/column). > > hth > Scott > > Scott Melby > Founder, Fast Lane Software LLC > http://www.fastlanesw.com > > > > letterpigeon wrote: > > > > 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 <smelby@> 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 > > > > > > > > > > > > > > > >
