Problem sorting list with virtual layout = false (and also with true)

Question

Hi,
I've a problem sorting a list... or better... I've a problem showing the sorted list ;-)
I've a list of xml item. The list is shown with an item renderer.
my needs: a button to refresh data and a button to sort data.
useVirtualLayout = false
-> refresh works correctly, sort does not affect the view (even if the list is sorted correctly when printed with trace)
useVirtualLayout = true
-> sort works correctly, refresh reverse the list each time I press it (even if the list remain the same when printed with trace)
does any one have an idea?
thank you!!
MXML
<s:List dataProvider="{xmlListCollection}" width="100%" itemRenderer="myRenderer" minHeight="0" id="test" useVirtualLayout="false" >
<s:layout>
  <s:VerticalLayout clipAndEnableScrolling="true"/>
</s:layout>
</s:List>
XML example
<unit sortField1="First Floor" sortField2="7">
  <employee>
    <id>3040684</id>
    <name>PIFFARETTI Vasco</name>
    <birthdate>20.05.1983</birthdate>
    <beginDate>2012-02-25 08:55:00</beginDate>
    <endDate>9999-12-31 00:00:00</endDate>
    <annotation/>
  </employee>
</unit>

Answer 1

You can tell when the scroll position has changed by handling the propertyChange event coming from the DataGroup:
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
               xmlns:s="library://ns.adobe.com/flex/spark"
               creationComplete="list1.dataGroup.addEventListener('propertyChange', handle)">
    <fx:Script>
        <![CDATA[
            import mx.events.PropertyChangeEvent;
            private function handle(e:PropertyChangeEvent):void {
                if (e.property == 'verticalScrollPosition'){
                    trace('vsp changed');               
                if (e.property == 'horizontalScrollPosition'){
                    trace('hsp changed');               
        ]]>
    </fx:Script>
    <s:List id="list1" width="100" height="50">
        <s:layout>
            <s:VerticalLayout />
        </s:layout>
        <s:dataProvider>
            <s:ArrayList>
                <fx:String>0</fx:String>
                <fx:String>1</fx:String>
                <fx:String>2</fx:String>
                <fx:String>3</fx:String>
                <fx:String>4</fx:String>
                <fx:String>5</fx:String>
                <fx:String>6</fx:String>
                <fx:String>7</fx:String>
            </s:ArrayList>
        </s:dataProvider>
    </s:List>
</s:Application>
You might also want to read and consider voting for http://bugs.adobe.com/jira/browse/SDK-21357