Ok, in my (brand new) github at [1] I tried to reimplement the thing, refactoring the EmptyItemComboBox code into an IList implementation as suggested by Alex.
I also quickly adapted the same simple test app that I attached to the stackoverflow response to see the class in action [2]. [1] https://github.com/cosma/Apache-Flex-Personal-Whiteboard/blob/master/FixedElementsList.as [2] https://github.com/cosma/Apache-Flex-Personal-Whiteboard/blob/master/FixedElementsListDemo.mxml 2012/4/10 Cosma Colanicchia <cosma...@gmail.com>: > @Alex didn't know that MX components received this kind of upgrades in > the 4.x branch, I thought they were in "maintenance mode" (exluding > the work on spark skins for halo). > > > 2012/4/10 Cosma Colanicchia <cosma...@gmail.com>: >> The EmptyItemComboBox class posted by David Coleman looks similar to >> some code I posted years ago on StackOverflow [1]. I added some >> explanation and a snippet of code showing its usage there. >> >> I'm not particularly proud of this code, but didn't managed to find a >> better way. The behavior approach seems interesting. >> >> [1] http://stackoverflow.com/questions/949180/null-in-flex-combobox >> >> >> Cosma >> >> >> 2012/4/10 Alex Harui <aha...@adobe.com>: >>> >>> >>> >>> On 4/10/12 12:17 PM, "Jeffry Houser" <jef...@dot-com-it.com> wrote: >>> >>>> I gave it a selectedValue property, a valueField property, and a >>>> valueFunction property; similar--in concept--to how the selectedItem, >>>> labelField, and labelFunction work. >>>> >>>> Really the code is just a layer of abstraction for a loop. If I were >>>> to implement something like that in the framework, I'd probably to up to >>>> List or ListBase as opposed to making it ComboBox specific. >>>> >>> And for the record, starting in Flex 4, MX Combobox had this function >>> property [1]. It was not implemented in Spark. But these days I am a fan >>> of plugging in things like this. >>> >>> [1] >>> http://help.adobe.com/en_US/FlashPlatform//reference/actionscript/3/mx/contr >>> ols/listClasses/ListBase.html#selectedItemsCompareFunction >>> >>> -- >>> Alex Harui >>> Flex SDK Team >>> Adobe Systems, Inc. >>> http://blogs.adobe.com/aharui >>>
