ActionScript实现TreeView数据结构

　　由于ActionScript语言的动态特性，flex中所有树形结构数据都是直接使用xml进行处理的，虽然非常灵活，但是在使用时也会感到不方便，因此不妨实现一个Treeview的数据结构，并以此数据结构作为mxml中的数据源，使用起来就会方便很多了。
　　TreeNode的代码： ; publicvar ImageTooltip:String=""; publicvar ImageUrl:String=""; publicvar Selected:Boolean=false; publicvar Tooltip:String=""; publicvar Children:ArrayCollection=null; publicfunction TreeNode(xml:XML) { if(xml==null) return; this.text = xml.TEXT||xml.@TEXT||xml.@text||xml.text; this.value = xml.VALUE||xml.@VALUE||xml.@value||xml.value; this.url = xml.URL||xml.@URL||xml.@url||xml.url; this.Target = xml.TARGET||xml.@TARGET||xml.@Target||xml.Target; var showCheckBox:String = xml.SHOWCHECKBOX||xml.@SHOWCHECKBOX|| xml.@ShowCheckBox||xml.ShowCheckBox; this.ShowCheckBox = showCheckBox=="true"; var checked:String = xml.CHECKED||xml.@CHECKED||xml.@Checked||xml.Check ed; this.Checked = checked=="true"; var expand:String = xml.EXPANDED||xml.@EXPANDED|| xml.@Expanded||xml.Expanded; this.Expanded = expand=="true"; if(xml.DEPTH!=undefined){ this.Depth = xml.DEPTH; } this.ImageTooltip = xml.IMAGETOOLTIP||xml.@IMAGETOOLTIP|| xml.@ImageTooltip||xml.ImageTooltip; this.ImageUrl = xml.IMAGEURL||xml.@IMAGEURL|| xml.@ImageUrl||xml.ImageUrl; if(xml.SELECTED!=undefined){ this.Selected = xml.SELECTED=="true"; } if(xml.TOOLTIP!=undefined){ this.Tooltip = xml.TOOLTIP; } if(xml.CHILDNODES!=undefined && xml.CHILDNODES.length()>0){ var cNodes:ArrayCollection = new ArrayCollection(); for(var index:int=0;indexlength();index++){ var xNode:XML = xml.CHILDNODES.child(index)[0]; if(xNode!=null){ cNodes.addItem(new TreeNode(xNode)); } } this.Children = cNodes; } } ///转换为XMLpublicfunction ToXML():XML{ var node:XML = new XML(""); node.@text = this.text; node.@value = this.value; node.@Checked = this.Checked; node.@Depth = this.Depth; node.@Expanded = this.Expanded; node.@ImageTooltip = this.ImageTooltip; node.@ImageUrl = this.ImageUrl; node.@Selected = this.Selected; node.@ShowCheckBox = this.ShowCheckBox; node.@Target = this.Target; node.@Tooltip = this.Tooltip; node.@url = this.url; if(this.Children!=null && this.Children.length>0){ for each(var cNode:TreeNode inthis.Children){ node.appendChild(cNode.ToXML()); } } return node; } } } TreeView的代码： package com.sample.Control { import mx.collections.ArrayCollection; ///Tree控件的数据源容器public dynamic class TreeView { privatevar m_Nodes:ArrayCollection; ///构造，参数可以为TreeNode、XML、XMLListpublicfunction TreeView(nodes:Object=null) { m_Nodes=new ArrayCollection(); if(nodes!=null){ if(nodes is TreeNode){ m_Nodes.addItem(nodes); } elseif(nodes is XML){ this.createFromXML(nodes as XML); }elseif(nodes is XMLList){ this.createFromXMLList(nodes as XMLList); } } } //从XML构造privatefunction createFromXML(xml:XML):void{ if(xml.@text!=undefined || xml.text!=undefined|| xml.@TEXT!=undefined || xml.TEXT!=undefined){ m_Nodes.addItem(new TreeNode(xml)); }elseif(xml.children().length()>0){ createFromXMLList(xml.children()); } } //从XMLList构造privatefunction createFromXMLList(xmlList:XMLList):void{ if(xmlList.length()>0){ for(var index:int=0; indexlength();index++){ var xml:XML = xmlList[index]; m_Nodes.addItem(new TreeNode(xml)); } } } ///转换为XMLpublicfunction ToXML():XML{ var xml:XML = new XML(""); if(m_Nodes.length>0){ for each(var node:TreeNode in m_Nodes){ xml.appendChild(node.ToXML()); } } return xml; } staticpublicfunction GetCheckedTreeNode(Data:XMLList):ArrayCollection{ if(Data==null)returnnull; var array:ArrayCollection = new ArrayCollection(); for(var index:int =0;indexlength();index++){ var xNode:XML = Data.child(index)[0]; GetCheckedTreeNodeByNode(xNode,array); } return array; } staticprivatefunction GetCheckedTreeNodeByNode(Node:XML,array:ArrayColle ction):void{ if(Node.@Checked=="true"){//本节点已经勾选 array.addItem(Node); } if(Node.children().