Adobe Flex 4.5 Spark: Binding ItemRenderer Component to Parent - apache-flex

Question

In Flex 3, it used to be possible to bind a component property within an itemRenderer via outerDocument. So for instance, if there was a image inside an itemRenderer that was only displayed on a given condition of the parent, something like this would work perfectly:
<mx:itemRenderer>
<mx:Component>
<mx:Label text="{data}"/>
<mx:Image id="img" visible="{outerDocument.ShowImage}" includeInLayout="{outerDocument.ShowImage}"/>
</mx:Component>
</mx:itemRenderer>
where the outer document (not the list, but the mxml the list is in) contained something like
[Bindable]
public function get ShowImage():void
{
return showImage;
}
public function set ShowImage(val:Boolean):void
{
showImage = val;
}
I've tried to do the same thing in Flex 4.5 using Spark item renderers using parentDocument, but it doesn't seem to be aware to the binding. When I do this in Flex 4.5, the itemRenderer doesn't seem to be aware when the parentDocument ShowImage changes.
Has anyone seen this issue and is able to offer a solution?
EDIT: Add Spark Source
As requested here is my spark source:
MyItemRenderer.mxml
<s:ItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx">
<s:Label id="myLabel" text="{data}/>
<s:Image src="something.png" visible="{parentDocument.ShowImage}" includeInLayout="{parentDocument.ShowImage}"/>
</s:ItemRenderer>
RendererContainer.mxml
<s:Panel xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx">
<fx:Script>
<![CDATA[
private var showImage:Boolean = false;
[Bindable]
public function set ShowImage(val:Boolean):void
{
showImage = val;
}
public function get ShowImage():Boolean
{
return showImage;
}
]]>
</fx:Script>
<!-- Content Group -->
<s:List id="lstCell" width="100%" height="100%" itemRenderer="MyItemRenderer">
</s:List>
</s:Panel>
Ok so there is a checkbox in a wrapper outside of RendererContainer.mxml that dispatches a custom event that is handled by changing a Bindable Boolean. The change in that var then changes the ShowImage property on my RendererContainer component. I would expect that the binding would then be picked up by MyItemRenderer but it doesnt seem to be working.
So my outer wrapper would access ShowImage like this
<comp:RendererContainer id="myId" ShowImage="{myCheckbox.selected}"/>

Answer 1

I think this should do the trick for you, YourTypeHere would be the class of the containing
object, make sure the ShowImage property is public and bindable.
<mx:itemRenderer>
<mx:Component>
<mx:Script>
<![CDATA[
import YourTypeHere;
]]>
</mx:Script>
<mx:Label text="{data}"/>
<mx:Image id="img"
visible="{YourTypeHere(this.parent.ShowImage)}"
includeInLayout="{YourTypeHere(this.parent.ShowImage)}"/>
</mx:Component>
</mx:itemRenderer>
P.s. please don't name properties with a starting uppercase letter, including getters, consider naming it showImage and your private var to something like _showImage instead :D

Answer 2

Your getter seems to have return type as void. Change that to Boolean
[Bindable]
public function get ShowImage():Boolean
{
return showImage;
}
public function set ShowImage(val:Boolean):void
{
showImage = val;
}

Answer 3

This will help.
<s:Image src="something.png" visible="{RendererContainer(ListSkin(parentDocument).parentDocument).ShowImage}" includeInLayout="{RendererContainer(ListSkin(parentDocument).parentDocument).ShowImage}"/>

Answer 4

Following works perfectly fine:
<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx">
<s:layout>
<s:VerticalLayout/>
</s:layout>
<fx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
]]>
</fx:Script>
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<s:Panel xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx">
<s:layout>
<s:VerticalLayout/>
</s:layout>
<fx:Script>
<![CDATA[
private var showImage:Boolean = false;
[Bindable]
public function set ShowImage(val:Boolean):void
{
showImage = val;
}
public function get ShowImage():Boolean
{
return showImage;
}
]]>
</fx:Script>
<s:CheckBox label="Select" change="{ShowImage = !ShowImage}"/>
<!-- Content Group -->
<s:List id="lstCell" width="100%" height="100%" dataProvider="{new ArrayCollection(['A','B'])}">
<s:itemRenderer>
<fx:Component>
<s:ItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
autoDrawBackground="true">
<s:layout>
<s:HorizontalLayout/>
</s:layout>
<s:Label id="myLabel" text="{data}"/>
<s:Button label="something.png" visible="{outerDocument.ShowImage}" includeInLayout="{outerDocument.ShowImage}"/>
</s:ItemRenderer>
</fx:Component>
</s:itemRenderer>
</s:List>
</s:Panel>
</s:WindowedApplication>