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POFlex Mobile: Strange behavior in IconItemRenderer List
 

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  1. POFlex Mobile: Strange behavior in IconItemRenderer List
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    <p>I'm desperately trying to fix a strange behavior in my custom iconitemrenderer list: When I change the view to the view with the list inside and start scrolling, the list gets white for the fraction of a second (apperently completely redrawn), but only once when scrolling the first time after the view change.</p> <p>In the IconItemRenderer I add a check mark:</p> <pre><code>&lt;s:IconItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark"&gt; ... override protected function commitProperties():void { //create checkbox if(!checkMarkImage &amp;&amp; data.isChecked) { //create image holder imageHolder = new Group; addChild(imageHolder); //create image checkMarkImage = new BitmapImage(); checkMarkImage.source = checkBoxSource; imageHolder.addElement(checkMarkImage); } //delete checkmark else if(checkMarkImage &amp;&amp; !data.isChecked) { removeChild(imageHolder); imageHolder = null; checkMarkImage = null; } super.commitProperties(); } override protected function layoutContents(w:Number, h:Number):void { super.layoutContents(w, h); //layout the checkmark if(checkMarkImage) { // don't do it like this! (see correct answer) checkMarkImage.x = w-40; checkMarkImage.y = 14; } } </code></pre> <p>The list change handler sets the mark on the selected item and removes it from the old one. After this is done it calls popView(), but when you come again to this view the list gets created in the views addHandler and when you start scrolling the list behaves as mentioned above.</p> <pre><code>//list change protected function myList_changeHandler(event:IndexChangeEvent):void { //is already selected? var item:Object = myList.selectedItem; if(!item.isChecked) { //deselect the other one? var length:int = myList.dataProvider.length; var oldItem:Object; for(var i:int = 0; i &lt; length; i++) { oldItem = myList.dataProvider.getItemAt(i); if(oldItem.isChecked) { oldItem.isChecked = false; myList.dataProvider.itemUpdated(oldItem); break; } } //select new one item.isChecked = true; myList.dataProvider.itemUpdated(item); } //pop view navigator.popView(); } </code></pre> <p>I think the problem is in the myList.dataProvider.itemUpdated(oldItem), apperently the renderer thinks it has to redraw everthing, but I have no idea why.. and why only after the view is shown again...?</p> <p>Any ideas if it's a bug or something? how can I get rid of this bahavior or how can I debug this this properly? thanks</p>
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    1. USMorbZ
    1. USMorbZ
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      1. POFlex Mobile: Strange behavior in IconItemRenderer List
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    1. COA quick one; but calling itemUpdated on the dataProvider will force the dataChange event to fire in the itemRenderer. I would expect that would force a component to redraw--as that is the only reason to call the itemUpdated function. But I don't see a dataChange event handler in your code, so I'm unclear.
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      1. POFlex Mobile: Strange behavior in IconItemRenderer List
      1. USJeffryHouser
    2. COBy calling itemUpdated() the itemRenderer can either create a new check mark image or delete the old one, so in fact it has to redraw. In the ItemRenderer I don't use the set data() method but the commitProperties() method since the original optimized imemRenderers do the same. But nonetheless by calling itemUpdated() I want only single list items to redraw, not the whole list.
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      1. POFlex Mobile: Strange behavior in IconItemRenderer List
      1. USMorbZ
    3. COBut the big question is: Why does the list gets redrawed when I start scrolling, thats not necessary
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      1. POFlex Mobile: Strange behavior in IconItemRenderer List
      1. USMorbZ
 

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