Hi Scott, Not sure why if I only use a checkbox (or CenteredCheckBox) as the item renderer, a checkbox also appears on the header of that column. Have you seen this problem before?? Thanks.
Ban --- In [email protected], Scott Melby <[EMAIL PROTECTED]> wrote: > > Should have mentioned a couple of quick cheats in case you have not > thought of them... if you use Alex's centered image renderer then you > could probably do either of the following very easily > > 1) Put the label in the column next to the image > 2) Just show the image and set the data tip for the column to be the > label text. > > hth > Scott > > Scott Melby > Founder, Fast Lane Software LLC > http://www.fastlanesw.com > > > > Scott Melby wrote: > > Check out CenteredCheckBox on Alex's blog (assuming you want it > > centered, otherwise just use CheckBox). I think Alex's blog also has > > something for a centered image which should be easily adaptable to add > > the text next to it (if it doesn't already support it). You can > > contact me off list if you want help with the image one. > > > > Scott > > Scott Melby > > Founder, Fast Lane Software LLC > > http://www.fastlanesw.com > > > > > > letterpigeon wrote: > >> > >> 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] > >> <mailto:flexcoders%40yahoogroups.com>, Scott Melby <smelby@> 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 <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> > >> > > <mailto:flexcoders%40yahoogroups.com>, Scott Melby <smelby@> wrote: > >> > > > > >> > > > Check out this post <http://blog.fastlanesw.com/?p=25 > >> <http://blog.fastlanesw.com/?p=25> > >> > > <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> > >> <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 > >> > > > > > >> > > > > > >> > > > > >> > > > >> > > > >> > > >> > >> >
