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POForcing vertical scrollbar re-calcuation in a hierarchical tree class derived from mx.controls.Tree
 

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  1. POForcing vertical scrollbar re-calcuation in a hierarchical tree class derived from mx.controls.Tree
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    <p>I'm working (for my sins) on a Flex 3.3 project, which unfortunately cannot be upgraded to a newer SDK version at this stage, and have hit an issue with the custom hierarchical tree class (subclassing <code>mx.controls.Tree</code>) we're using. <em>Excuse the spelling; the previous developer had a fear of dictionaries...</em></p> <pre><code>public class HierachyTree extends Tree public function HierachyTree() { super(); iconFunction = itemIconFunc; // etc. } </code></pre> <p>I'm using a solution somewhere between these <a href="http://www.davidarno.org/2009/04/01/how-to-filter-all-nodes-of-a-flex-tree-component/" rel="nofollow">two</a> <a href="http://richardleggett.co.uk/blog/index.php/2009/05/11/filtering-hierachical-data-in-flex-itree" rel="nofollow">methods</a> (basically, implementing <code>ITreeDataDescriptor</code>) in order to add live text filtering to the component, and it's working so far:</p> <pre><code>public class HierachyTreeFilteredDataDescriptor implements ITreeDataDescriptor { private var filter:Function public function HierachyTreeFilteredDataDescriptor(filterFunction:Function) { this.filter = filterFunction; } public function getChildren(node:Object, model:Object=null):ICollectionView { var children:ArrayCollection = new ArrayCollection([]); // Filter the children... return children; } public function hasChildren(node:Object, model:Object=null):Boolean { var treeItem:Object = node as Object; if (! (treeItem is ScenarioMeta)) return (treeItem as Object).children.length &gt; 0; else return false; } </code></pre> <p>The issue is that (with <code>tree:HierachyTree</code>) neither <code>tree.maxVerticalScrollPosition</code> nor the protected property <code>tree.verticalScrollBar.maxScrollPosition</code> updates when the search string is changed.</p> <p>I've tried calling <code>invalidateList()</code> and <code>invalidateDisplayList()</code> on <code>tree</code> — and calling <code>invalidateDisplayList()</code> and <code>invalidateSize()</code> on <code>tree.verticalScrollBar</code> — to no avail.</p> <p>Any ideas?</p>
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