(ArcGIS Flex API)根据地图数据构建动态树

根据地图数据动态构建树，如下图所示，数据如下：

构建如下一颗动态构造的树（查询上述面图层的数据，作为父节点，再做面数据的相交查询，查询出每个面相交的道路数据作为子节点），结果如下：

实现代码：

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
               xmlns:s="library://ns.adobe.com/flex/spark" 
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"
               xmlns:esri="http://www.esri.com/2008/ags"
               creationComplete="init()">
    
    
    <fx:Script>
        <![CDATA[
            import com.esri.ags.FeatureSet;
            import com.esri.ags.Graphic;
            
            import mx.collections.ArrayCollection;
            import mx.controls.Alert;
            import mx.events.ListEvent;
            import mx.events.TreeEvent;
            import mx.rpc.AsyncResponder;
            import mx.rpc.events.ResultEvent; 
            
            private var _node:XML;
            private var _nodeArea:XML;
            
            [Bindable]   
            private var xmlTree:XML = <node name="设备管理" is_parent="true" level="1">

                                      </node>;                  
            
            private var arrArea:Array = new Array();
            
            
            private function init():void
            {
                queryTask.execute(query, new AsyncResponder(onResult, onFault));                
                
                function onResult(featureSet:FeatureSet, token:Object = null):void
                {
                    arrArea = featureSet.features;
                    var arraylist:ArrayCollection = new ArrayCollection();
                    for(var i:Number=0;i<featureSet.features.length;i++)
                    {
                        
                        //构建第二层节点，“区域”
                        var gra:Graphic = featureSet.features[i];
                        var Name:String = gra.attributes.Name;            
                        var newNode:XML = <node/>;   
                        newNode.@name=Name;   
                        newNode.@level = "2";
                        
                        _nodeArea = newNode;
                        right_tree.dataDescriptor.addChildAt(xmlTree, newNode, i, xmlTree);     
                        
                        
                        //构建第三层树节点
                        queryRoad(gra,_nodeArea);
//                        var newNode2:XML = <node/>;   
//                        newNode2.@name="yyy"; 
//                        right_tree.dataDescriptor.addChildAt(_nodeArea, newNode2, 0, _nodeArea);     
                        
                    }
                    
                    
                }
                
                function onFault(info:Object, token:Object = null):void
                {
                    Alert.show(info.toString(), "Query Problem");
                }
            }
            
            
//构建子节点
            private function queryRoad(gra:Graphic,nodeArea:XML):void
            {            
                var query:Query = new Query();                
                query.geometry = gra.geometry;                
                query.spatialRelationship = Query.SPATIAL_REL_INTERSECTS;            
                query.outFields = ["Name"];                
                query.returnGeometry = true;                
                queryTask1.execute(query, new AsyncResponder(onResult, onFault));    
                function onResult(featureSet:FeatureSet, token:Object = null):void
                {
                    for(var i:int=0;i<featureSet.features.length;i++)
                    {
                        var graphic:Graphic = featureSet.features[i];
                        var Name:String = graphic.attributes.Name;
                        
                        var newNode2:XML = <node/>;   
                        newNode2.@name=Name; 
                        right_tree.dataDescriptor.addChildAt(nodeArea, newNode2, 0, nodeArea);     
                    }
                    
                }
                
                function onFault(info:Object, token:Object = null):void
                {
                    Alert.show(info.toString(), "Query Problem");
                }

            }
            
            private function tree_itemOpen(evt:TreeEvent):void {
                
                var xml:XML = evt.itemRenderer.data as XML;
                
                for(var i:Number=0;i<arrArea.length;i++)
                {
                    var gra:Graphic = arrArea[i];
                    
                    
                    if(gra.attributes.Name == xml.@name)
                    {
//                        Alert.show(xml.@name);
                    }
                }
                
            }
            
            private function test2(evt:ListEvent):void {
                Alert.show(right_tree.selectedItem.@name);
                

            }
            
        ]]>
    </fx:Script>
    
    <fx:Declarations>
        <esri:QueryTask id="queryTask" url="http://localhost:6080/arcgis/rest/services/DevicesManager/MapServer/1"/>
        <esri:QueryTask id="queryTask1" url="http://localhost:6080/arcgis/rest/services/DevicesManager/MapServer/0"/>
        <esri:Query id="query" returnGeometry="true" text="1" where="1=1" outFields="[Name,OBJECTID,isParent]"/>    
    </fx:Declarations>
    <mx:Tree id="right_tree" 
             dataProvider="{xmlTree}" 
             itemOpen="tree_itemOpen(event)" itemClick="test2(event)"
             labelField="@name"
             bottom="0" top="25" right="0" left="0">
    </mx:Tree>
</s:Application>