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POHow to trigger itemRendererFunction to be called again when data change in Flex
 

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  1. POHow to trigger itemRendererFunction to be called again when data change in Flex
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    <p>I have a list that uses a itemRendererFunction to get custom item renderers. Is there a way to only reevaluate one item in the list and get different item renderer? </p> <p>imagine code like this :</p> <p>there are two item renderers ItemRendererOne.mxml and ItemRendererTwo.mxml</p> <p>Data.as</p> <pre><code>package { public class Data { private var _data : Boolean = false; [Bindable] public function get data():Boolean { return _data; } public function set data(value:Boolean) : void { _data = value; } public function Data(value : Boolean) { _data = value; } } } </code></pre> <p>and main app is </p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;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" &gt; &lt;fx:Script&gt; &lt;![CDATA[ import mx.collections.ArrayList; private var dataProvider : ArrayList = new ArrayList([new Data(true), new Data(false)]); public function getItemRenderer(data : Object) : IFactory { if (data.data) { return new ClassFactory(ItemRendererOne); } else { return new ClassFactory(ItemRendererTwo); } } protected function button1_clickHandler(event : MouseEvent) : void { var data : Data = dataProvider.getItemAt(0) as Data; data.data = !data.data; } ]]&gt; &lt;/fx:Script&gt; &lt;s:VGroup&gt; &lt;s:List dataProvider="{dataProvider}" itemRendererFunction="{getItemRenderer}" /&gt; &lt;s:Button click="button1_clickHandler(event)" /&gt; &lt;/s:VGroup&gt; &lt;/s:WindowedApplication&gt; </code></pre> <p>Basically when someone clicks on the button, I want getItemRenderer to be called again and the item in the list is updated with new item renderer. </p>
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    1. CONot positive about this so I'm not posting it as an answer, but have you tried myListId.invalidateList() believe this will cause it to call the itemRendererFunction again for each element in the list.
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    2. CO(I'm guessing you mean invalidateDisplayList()) doesn't seem to work. only way I got item renderer to refresh was to reset the data provider entirely. but that causes all item to be redraw and caused a flicker which I do not want
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    3. COI actually did mean invalidateList() but I'm also coming from a mostly Flex 3 perspective, believe that was an available method on datagrid (if not it must have been advanced data grid) but it caused the items in the list to get invalidation called on them I believe, had helped us in the past with similar scenarios. If you still haven't found a viable solution respond again and I'll try to build this out and figure out what needs to be done.
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