Flex - Sending a parameter to a custom ItemRenderer?

Question

What I am trying to accomplish to to get financial data in my Flex Datagrid to be color-coded--green if it\'s positive; red if it\'s negative. This would be fairly straight

Answer 1

There's another technique, which, while it initially feels a little hacky is perhaps less cumbersome and cleaner in actual use.

It involves the little-observed fact that an event dispatch is, of course, synchronous and the event object can be treated as a value object populated by any event handler.

i.e. the ItemRenderer can do something like:

  ...
  var questionEvt:DynamicEvent = new DynamicEvent('answerMeThis', true, true);
  if (dispatchEvent(questionEvt))
  {
      if (questionEvent.answer == "some value")
      ....

With a corresponding handler somewhere up the view hierarchy above the renderer that has a listener on the event and does something like:

function handleAnswerMeThis(event:DynamicEvent):void
{
     event.answer = "another value";
     event.dataHelper = new DataHelperThingy();
}

etc.

It need not be a DynamicEvent - I'm just using that for lazy illustrative purposes.