[flexcoders] Total dynamicaly filtered content

[Ian Skinner]

I'm displaying lists of events, and need to provide a total of certain 
values contained in each event.  The display also contains controls to 
filter what events are shown and the totals need to honor these filters.

I have the following code that works in initial display, but does not 
update when filters are applied.  How does one dynamically bind to a 
"function" instead of a discrete value?

protected function staffDayTotal(day:Object):int
{
   var staffTot:int = 0;

   for (var i:int = 0; i < day.drawsQry.length; i++)
   {
     if (parentApplication.filterDraws(day.drawsQry[i]))
       staffTot = staffTot + day.drawsQry[i].R_MDL_STFCNT;
   }
        
   return staffTot;
}

...

<mx:Label paddingLeft="0" paddingRight="0"
   text="{staffDayTotal(totalCells.currentItem)}"
   width="20%" minWidth="0" minHeight="0"
   toolTip="Daily Total: Staff Count"/>