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POFlex: Updating a Tree control
 

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    <p>I've a tree control with checkboxes that uses the control from <a href="http://www.sephiroth.it/file_detail.php?id=151#" rel="noreferrer">http://www.sephiroth.it/file_detail.php?id=151#</a></p> <p>Somehow I can't get the control to update when I change the dataProvider (i.e. by clicking a checkbox) the only way I can get it to update is to use the scrollbar. How do I force the update? I've tried all possible methods I can figure out? (see update below)</p> <p>Also how can I reset the Tree (collpasing all nodes, scroll to the top in a large tree)?</p> <pre><code>package offerta.monkeywrench.components { import offerta.monkeywrench.components.componentClasses.TreeCheckBoxItemRenderer; import mx.collections.ArrayCollection; import mx.events.TreeEvent; public class WatchTree extends TreeCheckBox { public var idProperty:String; public var watchFactory:Function; private var _wSet:Boolean = false; /* clientId: */ private var _clientId:String; [Bindable] public function get clientId():String { return _clientId; } public function set clientId(value:String):void { this._clientId = value; } /* //clientId */ /* watching: */ private var _watching:ArrayCollection; [Bindable] public function set watching(value:ArrayCollection):void { this._watching = value; } public function get watching():ArrayCollection { return this._watching; } /* //watching */ override public function initialize() :void { super.initialize(); addEventListener("itemCheck", onItemCheck, false, 0, true); } private function isWatching(id:String):Boolean { for each(var w:Object in this._watching) { if(w[this.idProperty]==id) return true; } return false; } private function onItemCheck(event:TreeEvent):void { var item:Object = event.item as Object; var currentValue:uint = (event.itemRenderer as TreeCheckBoxItemRenderer).checkBox.checkState; if(item.children==null) { currentValue==2 ? addWatch(item.Id) : removeWatch(item.Id); } else { for each(var x:Object in item.children) { currentValue==2 ? addWatch(x.Id) : removeWatch(x.Id); } } updateParents(item, currentValue); updateChilds(item, currentValue); this.dataProvider.refresh(); super.invalidateProperties(); super.invalidateDisplayList(); super.updateDisplayList(this.unscaledWidth, this.unscaledHeight); } private function updateParents(item:Object, value:uint):void { var checkValue:String = (value == ( 1 &lt;&lt; 1 | 2 &lt;&lt; 1 ) ? "2" : value == ( 1 &lt;&lt; 1 ) ? "1" : "0"); var parentNode:Object = item.parent; if(parentNode) { for each(var x:Object in parentNode.children) { if(x.checked != checkValue) { checkValue = "2" } } parentNode.checked = checkValue; updateParents(parentNode, value); } } private function updateChilds(item:Object, value:uint):void { var middle:Boolean = (value&amp;2&lt;&lt;1)==(2&lt;&lt;1); if(item.children!=null &amp;&amp; item.children.length&gt;0&amp;&amp;!middle) { for each(var x:Object in item.children) { x.checked = value == (1&lt;&lt;1|2&lt;&lt;1) ? "2" : value==(1&lt;&lt;1) ? "1" : "0"; updateChilds(x, value); } } } private function addWatch(id:String):void { if(isWatching(id)) return; this._watching.addItem(this.watchFactory(id, this.clientId)); } private function removeWatch(id:String):void { for(var i:int=0, n:int=this._watching.length; i&lt;n; ++i) { if(this._watching[i][this.idProperty]==id) { this._watching.removeItemAt(i); return; } } } public function update(__watching:ArrayCollection, __clientId:String):void { clientId = __clientId; watching = __watching; if(this.dataProvider!=null) { var ws:ArrayCollection = ArrayCollection(this.dataProvider); for each(var group:Object in ws) { var count:int = 0; for each(var child:Object in group.children) { if(isWatching(child.Id)) { child.checked = "1"; count++; } } group.checked = (count==0 ? "0" : (count==group.children.length ? "1" : "2")); } this._wSet = false; var dp:ArrayCollection = ArrayCollection(this.dataProvider); dp.refresh(); super.invalidateProperties(); super.invalidateDisplayList(); super.updateDisplayList(this.unscaledWidth, this.unscaledHeight); //scroll up the list??? //collapse? (doesn't work) this.expandItem(null, false); } } } } </code></pre>
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