Comments on: Creating truly reusable renderers with ClassFactory

By: Ashish

Ashish — Thu, 12 Aug 2010 08:04:49 +0000

Hi Ben

Great Article!! It really helped me in solving one of complex problem in my project where I am required to build a dynamic grid with variable no of columns and apply one generic item renderer to apply across all of them.

By: Paul

Paul — Wed, 25 Feb 2009 06:05:45 +0000

Ah, I am doing it as a component in an existing mxml file, since I won’t need this component outside of this module. Is it possible to do it this way, or do I need to create a separate class?

By: Ben Clinkinbeard

Ben Clinkinbeard — Wed, 25 Feb 2009 02:50:29 +0000

Hi Paul,

The class you’re using as your renderer needs to implement the interface. So your class definition should look like public class MyRenderer implements IListItemRenderer { …. }

HTH,
Ben

By: Paul

Paul — Wed, 25 Feb 2009 02:19:50 +0000

Pardon my ignorance, but I am not sure what you mean when you say “If you implement ILIstItemRenderer ” If that is what you get by default when you specify the itemRenderer property on a mx:DataGridColumn, then I have implemented it.

I have breakpointed the code while in a function called from the item renderer, and was unable to find any variables similar to the ones you describe. For fun I tried trace(data.owner) and it returns undefined.

Thanks for the quick response btw.

By: Ben Clinkinbeard

Ben Clinkinbeard — Tue, 24 Feb 2009 20:29:18 +0000

Hi Paul,

If you implement ILIstItemRenderer you will have a listData property that gets automatically set for you. When inside a DataGrid it will be an instance of DataGridListData which contains properties like rowIndex, columnIndex and owner (the DG). Thats all from memory so exact names might be a bit off.

HTH,
Ben

By: Paul

Paul — Tue, 24 Feb 2009 20:25:50 +0000

The one thing I need that I am not sure this will do for me, but perhaps you might help, is to know what datagrid and row I was called from, I have an itemrenderer that is used in a tabbed form with multiple datagrids. In certain cases when the user clicks a check box I need to do different things based on which datagrid they are in.

Any ideas?

By: Mohammad

Mohammad — Wed, 29 Oct 2008 10:45:31 +0000

I’ve done it.

Thanks anyway

By: Mohammad

Mohammad — Mon, 27 Oct 2008 14:19:27 +0000

Thanks Ben
But for my case I have to use the nested datagrid; there are some design issues block me for making a use of the advancedatagrid .

if you can tell me how should the ItemRenderer Class looks like, this will be great and appreciated.

May thanks in advance.

By: Ben Clinkinbeard

Ben Clinkinbeard — Fri, 24 Oct 2008 19:04:10 +0000

Hi Mohammad,

While this is technically possible I would strongly recommend against it. You will likely run into performance issues very quickly and I also don’t think it would make for a good user experience to try and decipher nested grids. Perhaps look into the AdvancedDataGrid which allows you to selectively expand and collapse rows.

HTH,
Ben

By: Mohammad

Mohammad — Fri, 24 Oct 2008 09:34:23 +0000

Great Article.
I’m new to Flex3 and I have a question for you and I hope u own the answer ..
I want to add a datagrid as ItemRenderer to another main Datagrid ( in other words, nested datagrids).

how should the ItemRenderer Class looks and how to set the dataprovider to the of the sub-Datagrid .

Thanks in advance ..