The Advanced Data Grid has the concept of Renderer Providers which is pretty much what you are looking for, but the standard list control I don't think can handle this gracefully.
So... a single column ADG? (Though I'd shoot one of our developers is they suggested that ;) ) I'm not sure even suggesting overriding some of the more esoteric functions in the List will help as the recycling is almost certain to stuff you up! So no, this can't be done simply in a List control. Gk. Gregor Kiddie Senior Developer INPS Tel: 01382 564343 Registered address: The Bread Factory, 1a Broughton Street, London SW8 3QJ Registered Number: 1788577 Registered in the UK Visit our Internet Web site at www.inps.co.uk <blocked::http://www.inps.co.uk/> The information in this internet email is confidential and is intended solely for the addressee. Access, copying or re-use of information in it by anyone else is not authorised. Any views or opinions presented are solely those of the author and do not necessarily represent those of INPS or any of its affiliates. If you are not the intended recipient please contact [email protected] ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Thomas, Erik Sent: 02 February 2009 21:06 To: [email protected] Subject: [flexcoders] Need to render rows in a heterogeneous mx:List differently based on each row's item data Type Does anyone have a code sample of how I can supply a different itemRenderer to a List based on the data Type of the item in any given row? I have a heterogeneous collection of Types in an ArrayCollection (Property Sheet or User Preferences list) and want to render each row differently based on the data Type of the row item. For those of you familiar with MS WPF, it includes the notion of something called a "DataTemplate" which is essentially an Item Renderer that is used by the framework to render a particular data Type in a heterogeneous collection or on a form. I'd like to do the same thing in Flex within a List. Is there such a notion in Flex? Can it be done simply? I've tried implementing a Factory pattern where I supply a single itemRenderer (VBox) class to the List component which is an ActionScript class that simply overrides the "data" setter, and tests the Type of the "data" property (the row item type) and if it's a certain Type it instantiates or replaces a child container that properly renders the data based on its Type. This is not a simple pattern to follow or communicate. I'd like to find a simpler way. I've also tried using a single renderer with multiple top level components that use data binding to dynamically set "includeInLayout" and "visible" so only one of the top level components will render. This works, but the performance on a large list is abysmal in our ad hoc tests. Simple renderers not using "includeInLayout" were much faster. I've also tried using States to determine which part of the mxml to render based on the Type, but the pattern is just too complicated and too verbose. I'm in search of the cleanest possible pattern to recreate what you get out of the box with WPF, as I am sure someone at Adobe thought of this (it's an amazingly common use case), but it's just a matter of my learning how to do this. Thanks for your suggestions! Erik Erik Thomas | Small Business Group, Intuit | Staff Engineer | 650-944-2602
