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Flex4之Tree开发

1.首先得明白一点，FLEX4的TREE接受的是XML类型的数据，所以无论以何种方式获得XML数据，TREE通过dataProvider=XMLDATA和labelField=@viewname都可以显示出来一棵树

第一种方式，读取本地或远程XML文件

XML文件的格式，大致如下

Xml代码

<spanstyle="font-size: medium;"><?xmlversion="1.0"encoding="UTF-8"?>
<node label='所有分类'>
<node label='中国'value="http://www.baidu.com">
<nodelabel='河南'value="http://www.youdao.com">
<node label='信阳'/>
<node label='南阳'/>
</node>
<node label='河北'>
<nodelabel='保定'/>
<node label='衡水'/>
</node>
<nodelabel='湖南'>
<nodelabel='长沙'/>
<node label='湘潭'/>
</node>
<nodelabel='湖北'>
<nodelabel='武汉'/>
<nodelabel='仙桃'/>
</node>
</node>
</node>

<?xml version="1.0" encoding="UTF-8"?>
<node  label='所有分类'>
<node  label='中国' value="http://www.baidu.com">
<node label='河南' value="http://www.youdao.com" >
<node  label='信阳' />
<node  label='南阳'/>
</node>
<node  label='河北'>
<node label='保定'/>
<node  label='衡水'/>
</node>
<node label='湖南' >
<node label='长沙'/>
<node  label='湘潭'/>
</node>
<node label='湖北'>
<node label='武汉'/>
<node label='仙桃'/>
</node>
</node>
</node>

针对上面这个XML格式的文件，Flex4的TREE解析后显示的话会从第二个节点开始解析也即中国那个节点这种方式的代码我贴出来，大家看下

Xml代码

<spanstyle="font-size: medium;"><?xmlversion="1.0"encoding="utf-8"?>
<s:Applicationxmlns: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"
creationComplete="SrvTreeList.send();init()">
<fx:Style>
Tree {
folderClosedIcon: ClassReference(null);
folderOpenIcon: ClassReference(null);
}
</fx:Style>
<fx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
import mx.rpc.events.ResultEvent;
var XMLTreeList:XML;
protected function treeService_resultHandler(event:ResultEvent):void
{
//先把数据取出来交给XML,再交给dataProvider，因为dataProvider不能直接解析String为XML
XMLTreeList=XML(SrvTreeList.lastResult.toString());
MusicTypeTree.dataProvider=XMLTreeList;
}
//这里我写了一个右键菜单
public function init():void{
var item: ContextMenuItem=new ContextMenuItem("添加");
var menu:ContextMenu=new ContextMenu();
menu.customItems.push(item);
MusicTypeTree.contextMenu=menu;
}
protected function tree1_clickHandler(event:MouseEvent):void
{
if(MusicTypeTree.selectedItem.hasOwnProperty("@value" ))
{ //如果某节点中含有VALUE属性，那么就是先跳转页面
navigateToURL(new URLRequest(MusicTypeTree.selectedItem.@value));
} else
{
//没有那就展开，如果展开了就收缩
MusicTypeTree.expandItem(MusicTypeTree.selectedItem,!MusicTypeTree.isItemOpen(MusicTypeTree.selectedItem),true);
}
}
]]>
</fx:Script>
<fx:Declarations>
<s:HTTPService id="SrvTreeList"url="data/tree.xml"result="treeService_resultHandler(event)"useProxy="false" resultFormat="xml"/>
</fx:Declarations>
<mx:Treex="20"y="10"click="tree1_clickHandler(event)"id="MusicTypeTree"
left="5"right="5"
showRoot="false"
labelField="@label"
bottom="5"top="40"
></mx:Tree>
</s:Application>

<?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"
			   creationComplete="SrvTreeList.send();init()">
	<fx:Style>
		Tree {
		folderClosedIcon: ClassReference(null);
		folderOpenIcon: ClassReference(null);
		}
	</fx:Style>

	<fx:Script>
		<![CDATA[
			import mx.collections.ArrayCollection;
			import mx.rpc.events.ResultEvent;

			var XMLTreeList:XML;
			protected function treeService_resultHandler(event:ResultEvent):void
			{   
				//先把数据取出来交给XML,再交给dataProvider，因为dataProvider不能直接解析String为XML
				XMLTreeList=XML(SrvTreeList.lastResult.toString()); 
				MusicTypeTree.dataProvider=XMLTreeList; 

			}
                        //这里我写了一个右键菜单		
                       public function init():void{
			
			 var item: ContextMenuItem=new ContextMenuItem("添加");
			 var menu:ContextMenu=new ContextMenu();
			 menu.customItems.push(item);
			 MusicTypeTree.contextMenu=menu;
			}



			protected function tree1_clickHandler(event:MouseEvent):void
			{
				if(MusicTypeTree.selectedItem.hasOwnProperty("@value" ))
					
				{       //如果某节点中含有VALUE属性，那么就是先跳转页面
					navigateToURL(new URLRequest(MusicTypeTree.selectedItem.@value)); 
				} else
				{ 
					//没有那就展开，如果展开了就收缩
					MusicTypeTree.expandItem(MusicTypeTree.selectedItem,!MusicTypeTree.isItemOpen(MusicTypeTree.selectedItem),true);
				} 
			}

		]]>
	</fx:Script>
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
		<s:HTTPService  id="SrvTreeList" url="data/tree.xml" result="treeService_resultHandler(event)" useProxy="false"  resultFormat="xml" />
	</fx:Declarations>
	<!--@label这个非常重要，指定要显示的标题为XML重的label属性值。记住要显示树，httpService的send方法要在组件创建完成后被调用-->
	<mx:Tree x="20" y="10" click="tree1_clickHandler(event)" id="MusicTypeTree"
			 left="5" right="5" 
			 showRoot="false" 
			 labelField="@label"         
			 bottom="5" top="40"
			 
			 ></mx:Tree>
	
</s:Application>

第二种方式:将XML内容写到<fx:mxl>标签里面这种方式我们来看看

Xml代码

<spanstyle="font-size: medium;"><?xmlversion="1.0"encoding="utf-8"?>
<s:Applicationxmlns: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"
creationComplete="init()">
<fx:Declarations>
</fx:Declarations>
<fx:Script>
<![CDATA[
import mx.collections.ICollectionView;
import mx.events.ListEvent;
private function tree_itemClick(evt:ListEvent):void {
var item:Object = Tree(evt.currentTarget).selectedItem;
if (tree.dataDescriptor.isBranch(item)) {
tree.expandItem(item, !tree.isItemOpen(item), true);
}
}
private function tree_labelFunc(item:XML):String {
var children:ICollectionView;
var suffix:String = "";
if (tree.dataDescriptor.isBranch(item)) {
children = tree.dataDescriptor.getChildren(item);
suffix = " (" + children.length + ")";
}
return item[tree.labelField] + suffix;
}
]]>
</fx:Script>
<fx:Declarations>
<fx:XMLid="dp">
<root>
<folderlabel="One">
<folderlabel="One.A">
<itemlabel="One.A.1"/>
<itemlabel="One.A.2"/>
<itemlabel="One.A.3"/>
<itemlabel="One.A.4"/>
<itemlabel="One.A.5"/>
</folder>
<itemlabel="One.1"/>
<itemlabel="One.2"/>
</folder>
<folderlabel="Two">
<itemlabel="Two.1"/>
<folderlabel="Two.A">
<itemlabel="Two.A.1"/>
<itemlabel="Two.A.2"/>
</folder>
</folder>
</root>
</fx:XML>
</fx:Declarations>
<mx:Treeid="tree"
dataProvider="{dp}"
showRoot="false"
labelField="@label"
labelFunction="tree_labelFunc"
width="742"
rowCount="6"
itemClick="tree_itemClick(event);" x="14"y="12"height="359"/>
</s:Application>

<?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"
			   creationComplete="init()">
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
	</fx:Declarations>
<fx:Script>
	<![CDATA[
		import mx.collections.ICollectionView;
		import mx.events.ListEvent;
		private function tree_itemClick(evt:ListEvent):void {
			var item:Object = Tree(evt.currentTarget).selectedItem;
			if (tree.dataDescriptor.isBranch(item)) {
				tree.expandItem(item, !tree.isItemOpen(item), true);
			}
		}
		private function tree_labelFunc(item:XML):String {
			var children:ICollectionView;
			var suffix:String = "";
			if (tree.dataDescriptor.isBranch(item)) {
				children = tree.dataDescriptor.getChildren(item);
				suffix = " (" + children.length + ")";
			}
			return item[tree.labelField] + suffix;
		}
		
		
	]]>
</fx:Script>
	<fx:Declarations>
		

	<fx:XML id="dp">
		<root>
			<folder label="One">
				<folder label="One.A">
					<item label="One.A.1" />
					<item label="One.A.2" />
					<item label="One.A.3" />
					<item label="One.A.4" />
					<item label="One.A.5" />
				</folder>
				<item label="One.1" />
				<item label="One.2" />
			</folder>
			<folder label="Two">
				<item label="Two.1" />
				<folder label="Two.A">
					<item label="Two.A.1" />
					<item label="Two.A.2" />
				</folder>
			</folder>
		</root>
	</fx:XML>
	</fx:Declarations>
	<mx:Tree id="tree"
			 dataProvider="{dp}"
			 showRoot="false"
			 labelField="@label"
			 labelFunction="tree_labelFunc"
			 width="742"
			 rowCount="6"
			 itemClick="tree_itemClick(event);"  x="14" y="12" height="359"/>
	
</s:Application>

itemClick方法可以和labelFuntion可以不写，正常的话不写方法就能显示TREE的树形结构了

第三：再看一个例子

Xml代码

<spanstyle="font-size: medium;"><?xmlversion="1.0"encoding="utf-8"?>
<s:Applicationxmlns: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">
<fx:Declarations>
<fx:XMLListid="treeData">
<nodelabel="Mail Box">
<nodelabel="Inbox">
<nodelabel="Marketing"/>
<nodelabel="Product Management"/>
<nodelabel="Personal"/>
</node>
<nodelabel="Outbox">
<nodelabel="Professional"/>
<nodelabel="Personal"/>
</node>
<nodelabel="Spam"/>
<nodelabel="Sent"/>
</node>
</fx:XMLList>
</fx:Declarations>
<fx:Script>
<![CDATA[
[Bindable]
public var selectedNode:XML;
// Event handler for the Tree control change event.
public function treeChanged(event:Event):void {
selectedNode=Tree(event.target).selectedItem as XML;
}
]]>
</fx:Script>
<mx:Paneltitle="Tree Control Example"height="75%"width="75%"
paddingTop="10"paddingLeft="10"paddingRight="10"paddingBottom="10">
<mx:Labelwidth="100%"color="blue"
text="Select a node in the Tree control."/>
<mx:HDividedBoxwidth="100%"height="100%">
<mx:Treeid="myTree"width="50%"height="100%"labelField="@label"
showRoot="false"dataProvider="{treeData}"change="treeChanged(event)"/>
<mx:TextAreaheight="100%"width="50%"
text="Selected Item: {selectedNode.@label}"/>
</mx:HDividedBox>
</mx:Panel>
</s:Application>

<?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">
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
		<fx:XMLList id="treeData">  
			<node label="Mail Box">  
				<node label="Inbox">  
					<node label="Marketing"/>  
					<node label="Product Management"/>  
					<node label="Personal"/>  
				</node>  
				<node label="Outbox">  
					<node label="Professional"/>  
					<node label="Personal"/>  
				</node>  
				<node label="Spam"/>  
				<node label="Sent"/>  
			</node>     
		</fx:XMLList>  
	</fx:Declarations>
	<fx:Script>
		<![CDATA[
			[Bindable] 
			public var selectedNode:XML; 
			
			// Event handler for the Tree control change event. 
			public function treeChanged(event:Event):void { 
				selectedNode=Tree(event.target).selectedItem as XML; 
			} 
		]]>
	</fx:Script>
	<mx:Panel title="Tree Control Example" height="75%" width="75%"   
			  paddingTop="10" paddingLeft="10" paddingRight="10" paddingBottom="10">  
		
		<mx:Label width="100%" color="blue"   
				  text="Select a node in the Tree control."/>  
		
		<mx:HDividedBox width="100%" height="100%">  
			<mx:Tree id="myTree" width="50%" height="100%" labelField="@label"  
					 showRoot="false" dataProvider="{treeData}" change="treeChanged(event)"/>  
			<mx:TextArea height="100%" width="50%"  
						 text="Selected Item: {selectedNode.@label}"/>  
		</mx:HDividedBox>  
		
	</mx:Panel>  
</s:Application>

第四，到目前为止，应该可以看出来了XML的显示格式了，如果获取XML文件那么结果要转换成为 var xmlList:XML=XML(event.result.toString()); mytree.dataProvider=xmlList; 要么就是<mx:Tree dataProvider="{xmlList}" > 那么就是 <fx:xml id="xmlid"></fx:xml> <mx:Tree dataProvider="{xmlid}">

这么多的方式都可以把数据填充到TREE中去

第五：来一个增删拖拽展开，收缩的示例，这里先不涉及到后台，下一篇文章会讲到TREE与JAVA后台数据库的交互操作

Xml代码

<spanstyle="font-size: medium;"><?xmlversion="1.0"encoding="utf-8"?>
<s:Applicationxmlns: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"
creationComplete="SrvTreeList.send();init()">
<fx:Style>
Tree {
folderClosedIcon: ClassReference(null);
folderOpenIcon: ClassReference(null);
}
</fx:Style>
<fx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
import mx.controls.Alert;
import mx.core.DragSource;
import mx.core.UIComponent;
import mx.events.DragEvent;
import mx.managers.DragManager;
import mx.rpc.events.ResultEvent;
var XMLTreeList:XML;
protected function treeService_resultHandler(event:ResultEvent):void
{
//先把数据取出来交给XML,再交给dataProvider，因为dataProvider不能直接解析String为XML
XMLTreeList=XML(SrvTreeList.lastResult.toString());
MusicTypeTree.dataProvider=XMLTreeList;
}
public function init():void{
var item: ContextMenuItem=new ContextMenuItem("添加");
var menu:ContextMenu=new ContextMenu();
menu.customItems.push(item);
MusicTypeTree.contextMenu=menu;
}
protected function tree1_clickHandler(event:MouseEvent):void
{
if(MusicTypeTree.selectedItem.hasOwnProperty("@value" ))
{
var u:URLRequest=new URLRequest(MusicTypeTree.selectedItem.@value);
//navigateToURL(new URLRequest(MusicTypeTree.selectedItem.@value));
navigateToURL(u);
} else
{
//没有那就展开，如果展开了就收缩
MusicTypeTree.expandItem(MusicTypeTree.selectedItem,!MusicTypeTree.isItemOpen(MusicTypeTree.selectedItem),true);
}
}
//添加兄弟节点
protected function addBefore():void
{
var xml:XML=MusicTypeTree.selectedItem as XML;
var text:String=nextName.text;
if(xml!=null && text.length>0) {
var parent:XML=xml.parent();
if(parent!=null) {
var child:XML=new XML("<node foddersortName="" foddersortId="" parentid="" />");
child.@foddersortName=text;
parent.insertChildBefore(xml,child);
} else {
Alert.show("不能选中根节点");
}
} else {
Alert.show("需要先选中节点和填入文字");
}
}
protected function addAfter():void
{
var xml:XML=MusicTypeTree.selectedItem as XML;
var text:String=nextName.text;
if(xml!=null && text.length>0) {
var parent:XML=xml.parent();
if(parent!=null) {
var child:XML=new XML("<node foddersortName="" foddersortId="" parentid="" />");
child.@foddersortName=text;
parent.insertChildAfter(xml,child);
} else {
Alert.show("不能选中根节点");
}
} else {
Alert.show("需要先选中节点和填入文字");
}
}
protected function addSon():void
{
var xml:XML=MusicTypeTree.selectedItem as XML;
var text:String=nextName.text;
if(xml!=null && text.length>0) {
var parent:XML=xml.parent();
var child:XML=new XML("<node foddersortName="" foddersortId="" parentid="" />");
child.@foddersortName=text;
xml.appendChild(child);
MusicTypeTree.expandChildrenOf(xml,true);
} else {
Alert.show("需要先选中节点和填入文字");
}
}
protected function editNode():void
{
var xml:XML=MusicTypeTree.selectedItem as XML;
var text:String=nextName.text;
if(xml!=null && text.length>0) {
xml.@foddersortName=text;
} else {
Alert.show("需要先选中节点和填入文字");
}
}
protected function deleteNode():void
{
var xml:XML=MusicTypeTree.selectedItem as XML;
if(xml!=null) {
var list:Array=MusicTypeTree.selectedItems as Array;
for(var k:int=0;k<list.length;k++) {
xml=list[k] as XML;
var parent:XML=xml.parent();
if(parent!=null) {
var children:XMLList=parent.children();
for(var i:int=0;i<children.length();i++) {
if(children[i]==xml) {
delete children[i];
break;
}
}
} else {
Alert.show("不能选中根节点");
}
}
} else {
Alert.show("需要先选中节点");
}
}
protected function selectNode():void
{
var text:String=nextName.text;
if(text.length>0) {
var items:Array=[];
var list:XMLList=new XMLList();
list[0]=MusicTypeTree.dataProvider[0];
searchItems(list,text,items);
MusicTypeTree.selectedItems=items;
} else {
Alert.show("输入查找的文字");
}
}
private function searchItems(list:XMLList,find:String,items:Array):void {
for(var i:int=0;i<list.length();i++) {
var one:XML=list[i];
var label:String=one.@foddersortName;
if(label!=null && label.indexOf(find)>=0) {
items.push(one);
}
searchItems(one.children(),find,items);
}
}
protected function closeAll():void{
MusicTypeTree.openItems=[];
}
protected function openAll():void{
MusicTypeTree.expandChildrenOf(MusicTypeTree.selectedItem,true);
}
protected function MusicTypeTree_dragEnterHandler(event:DragEvent):void
{
Alert.show(event.target.@foddersortName);
DragManager.acceptDragDrop(UIComponent(event.currentTarget));
}
protected function MusicTypeTree_dragOverHandler(event:DragEvent):void
{
// r is the visible index in the tree
var dropTarget:Tree = Tree(event.currentTarget);
var r:int = dropTarget.calculateDropIndex(event);
MusicTypeTree.selectedIndex = r;
// retrieving the newly selected node, you can examine it and decide to tell
// the user the drop is invalid by changing the feedback.
var node:XML = MusicTypeTree.selectedItem as XML;
if( node.@foddersortName == "中国" ) {
DragManager.showFeedback(DragManager.NONE);
return;
}
// the type of drop - copy, link, or move can be reflected in the feedback as well.
// Here the control and shift keys determine that action.
if (event.ctrlKey)
DragManager.showFeedback(DragManager.COPY);
else if (event.shiftKey)
DragManager.showFeedback(DragManager.LINK);
else {
DragManager.showFeedback(DragManager.MOVE);
}
}
protected function MusicTypeTree_dragDropHandler(event:DragEvent):void
{
var xml:XML=MusicTypeTree.selectedItem as XML;
Alert.show(xml.@foddersortName);
// var ds:DragSource = event.dragSource;
// var dropTarget:Tree = Tree(event.currentTarget);
// // retrieve the data associated with the "items" format. This will be the data that
// // the dragInitiator has copied into the DragSource.
// var items:Array = ds.dataForFormat("items") as Array;
// // determine where in the tree the drop occurs and select that node by the index; followed by
// // retrieving the node itself.
// var r:int = MusicTypeTree.calculateDropIndex(event);
// MusicTypeTree.selectedIndex = r;
// var node:XML = MusicTypeTree.selectedItem as XML;
// var p:*;
// // if the selected node has children (it is type==city),
// // then add the items at the beginning
// if( MusicTypeTree.dataDescriptor.hasChildren(node) ) {
// p = node;
// r = 0;
// } else {
// p = node.parent();
// }
// // taking all of the items in the DragSouce, insert them into the
// // tree using parent p.
// for(var i:Number=0; i < items.length; i++) {
// var insert:XML = <node />;
// insert.@foddersortName= items[i];
// //insert.@type = "restaurant";
// MusicTypeTree.dataDescriptor.addChildAt(p, insert, r+i);
// }
}
protected function MusicTypeTree_dragCompleteHandler(event:DragEvent):void
{
MusicTypeTree.selectedIndex = -1;
}
]]>
</fx:Script>
<fx:Declarations>
<s:HTTPService id="SrvTreeList"url="data/tree.xml"result="treeService_resultHandler(event)"useProxy="false" resultFormat="xml"/>
</fx:Declarations>
<mx:Treeclick="tree1_clickHandler(event)"id="MusicTypeTree"
left="5"right="845"
showRoot="false"
labelField="@foddersortName"
bottom="243"top="40"
dragEnabled="true"
dropEnabled="true"
allowMultipleSelection="true"
allowDragSelection="true"
dragDrop="MusicTypeTree_dragDropHandler(event)"
dragEnter="MusicTypeTree_dragEnterHandler(event)"
></mx:Tree>
<s:TextInputid="nextName"x="432"y="40"/>
<s:Buttonx="443"y="82"label="增加为哥"click="addBefore()"/>
<s:Buttonx="443"y="111"label="增加为弟"click="addAfter()"/>
<s:Buttonx="444"y="144"click="addSon()"label="增加为孩子"/>
<s:Buttonx="444"y="178"click="editNode()"label="修改节点"/>
<s:Buttonx="444"y="211"click="deleteNode()"label="删除节点"/>
<s:Buttonx="443"y="244"click="selectNode()"label="选择节点"/>
<s:Buttonx="443"y="277"click="closeAll()"label="全部收缩"/>
<s:Buttonx="443"y="306"click="openAll()"label="全部展开"/>
</s:Application>

<?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"
			   creationComplete="SrvTreeList.send();init()">
	<fx:Style>
		Tree {
		folderClosedIcon: ClassReference(null);
		folderOpenIcon: ClassReference(null);
		}
	</fx:Style>

	<fx:Script>
		<![CDATA[
			import mx.collections.ArrayCollection;
			import mx.controls.Alert;
			import mx.core.DragSource;
			import mx.core.UIComponent;
			import mx.events.DragEvent;
			import mx.managers.DragManager;
			import mx.rpc.events.ResultEvent;

			var XMLTreeList:XML;
			protected function treeService_resultHandler(event:ResultEvent):void
			{   
				//先把数据取出来交给XML,再交给dataProvider，因为dataProvider不能直接解析String为XML
				XMLTreeList=XML(SrvTreeList.lastResult.toString()); 
				MusicTypeTree.dataProvider=XMLTreeList; 

			}

			public function init():void{
			
			 var item: ContextMenuItem=new ContextMenuItem("添加");
			 var menu:ContextMenu=new ContextMenu();
			 menu.customItems.push(item);
			 MusicTypeTree.contextMenu=menu;
			}



			protected function tree1_clickHandler(event:MouseEvent):void
			{
				if(MusicTypeTree.selectedItem.hasOwnProperty("@value" ))
				{ 
					
					var u:URLRequest=new URLRequest(MusicTypeTree.selectedItem.@value);
					//navigateToURL(new URLRequest(MusicTypeTree.selectedItem.@value)); 
					navigateToURL(u);
				} else
				{ 
					//没有那就展开，如果展开了就收缩
					MusicTypeTree.expandItem(MusicTypeTree.selectedItem,!MusicTypeTree.isItemOpen(MusicTypeTree.selectedItem),true);
				} 
			}

            //添加兄弟节点
			protected function addBefore():void
			{
				var xml:XML=MusicTypeTree.selectedItem as XML;
				var text:String=nextName.text;
				if(xml!=null && text.length>0) {
					var parent:XML=xml.parent();
					if(parent!=null) {
						var child:XML=new XML("<node foddersortName="" foddersortId=""  parentid="" />");
						child.@foddersortName=text;
						parent.insertChildBefore(xml,child);
					} else {
						Alert.show("不能选中根节点");
					}
				} else {
					Alert.show("需要先选中节点和填入文字");
				}
			}
			
			protected function addAfter():void
			{
				var xml:XML=MusicTypeTree.selectedItem as XML;
				var text:String=nextName.text;
				if(xml!=null && text.length>0) {
					var parent:XML=xml.parent();
					if(parent!=null) {
						var child:XML=new XML("<node foddersortName="" foddersortId=""  parentid="" />");
						child.@foddersortName=text;
						parent.insertChildAfter(xml,child);
					} else {
						Alert.show("不能选中根节点");
					}
				} else {
					Alert.show("需要先选中节点和填入文字");
				}
			}
			
			protected function addSon():void
			{
				var xml:XML=MusicTypeTree.selectedItem as XML;
				var text:String=nextName.text;
				if(xml!=null && text.length>0) {
					var parent:XML=xml.parent();
					var child:XML=new XML("<node foddersortName="" foddersortId=""  parentid="" />");
					child.@foddersortName=text;
					xml.appendChild(child);
					MusicTypeTree.expandChildrenOf(xml,true);
				} else {
					Alert.show("需要先选中节点和填入文字");
				}			
			}
			protected function editNode():void
			{
				var xml:XML=MusicTypeTree.selectedItem as XML;
				var text:String=nextName.text;
				if(xml!=null && text.length>0) {
					xml.@foddersortName=text;
				} else {
					Alert.show("需要先选中节点和填入文字");
				}			
			}
			protected function deleteNode():void
			{
				var xml:XML=MusicTypeTree.selectedItem as XML;
				if(xml!=null) {
					var list:Array=MusicTypeTree.selectedItems as Array;
					for(var k:int=0;k<list.length;k++) {
						xml=list[k] as XML;
						var parent:XML=xml.parent();
						if(parent!=null) {
							var children:XMLList=parent.children();
							for(var i:int=0;i<children.length();i++) {
								if(children[i]==xml) {
									delete children[i];
									break;
								}
							}
						} else {
							Alert.show("不能选中根节点");
						}
					}
				} else {
					Alert.show("需要先选中节点");
				}			
			}
			protected function selectNode():void
			{
				var text:String=nextName.text;
				if(text.length>0) {
					var items:Array=[];
					var list:XMLList=new XMLList();
					list[0]=MusicTypeTree.dataProvider[0];				
					searchItems(list,text,items);
					MusicTypeTree.selectedItems=items;
				} else {
					Alert.show("输入查找的文字");
				}
			}
			private function searchItems(list:XMLList,find:String,items:Array):void {
				for(var i:int=0;i<list.length();i++) {
					var one:XML=list[i];
					var label:String=one.@foddersortName;
					if(label!=null && label.indexOf(find)>=0) {
						items.push(one);
					}
					searchItems(one.children(),find,items);
				}
			}
			
			
			
			protected function closeAll():void{
				MusicTypeTree.openItems=[];
			
			}
			
			protected function openAll():void{
			
				
				MusicTypeTree.expandChildrenOf(MusicTypeTree.selectedItem,true);
			}


			protected function MusicTypeTree_dragEnterHandler(event:DragEvent):void
			{
				Alert.show(event.target.@foddersortName);
				DragManager.acceptDragDrop(UIComponent(event.currentTarget));
			}


			protected function MusicTypeTree_dragOverHandler(event:DragEvent):void
			{
				
				// r is the visible index in the tree 
				var dropTarget:Tree = Tree(event.currentTarget);
			
				var r:int = dropTarget.calculateDropIndex(event);
				MusicTypeTree.selectedIndex = r;
			
				// retrieving the newly selected node, you can examine it and decide to tell 
				// the user the drop is invalid by changing the feedback.
				var node:XML = MusicTypeTree.selectedItem as XML;
				if( node.@foddersortName == "中国" ) {
					DragManager.showFeedback(DragManager.NONE);
					return;
				}
				// the type of drop - copy, link, or move can be reflected in the feedback as well. 
				// Here the control and shift keys determine that action. 
				if (event.ctrlKey)
					DragManager.showFeedback(DragManager.COPY);
				else if (event.shiftKey)
					DragManager.showFeedback(DragManager.LINK);
				else {
					DragManager.showFeedback(DragManager.MOVE);
				}

			}


			protected function MusicTypeTree_dragDropHandler(event:DragEvent):void
			{
				var xml:XML=MusicTypeTree.selectedItem as XML;
				Alert.show(xml.@foddersortName);
//				var ds:DragSource = event.dragSource;
//				var dropTarget:Tree = Tree(event.currentTarget);
//				// retrieve the data associated with the "items" format. This will be the data that
//				// the dragInitiator has copied into the DragSource.
//				var items:Array = ds.dataForFormat("items") as Array;
//				// determine where in the tree the drop occurs and select that node by the index; followed by 
//				// retrieving the node itself. 
//				var r:int = MusicTypeTree.calculateDropIndex(event);
//				MusicTypeTree.selectedIndex = r;
//				var node:XML = MusicTypeTree.selectedItem as XML;
//				var p:*;
//				// if the selected node has children (it is type==city),
//				// then add the items at the beginning
//				if( MusicTypeTree.dataDescriptor.hasChildren(node) ) {
//					p = node;
//					r = 0;
//				} else {
//					p = node.parent();
//				}
//				// taking all of the items in the DragSouce, insert them into the 
//				// tree using parent p. 
//				for(var i:Number=0; i < items.length; i++) {
//					var insert:XML = <node />;
//					insert.@foddersortName= items[i];
//					//insert.@type = "restaurant";
//					MusicTypeTree.dataDescriptor.addChildAt(p, insert, r+i);
//				}
			}


			protected function MusicTypeTree_dragCompleteHandler(event:DragEvent):void
			{
				MusicTypeTree.selectedIndex = -1;

			}

		]]>
	</fx:Script>
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
		<s:HTTPService  id="SrvTreeList" url="data/tree.xml" result="treeService_resultHandler(event)" useProxy="false"  resultFormat="xml" />
	</fx:Declarations>
	<!--@label这个非常重要，指定要显示的标题为XML重的label属性值。记住要显示树，httpService的send方法要在组件创建完成后被调用-->
	<mx:Tree click="tree1_clickHandler(event)" id="MusicTypeTree"
			 left="5" right="845" 
			 showRoot="false" 
			 labelField="@foddersortName"         
			 bottom="243" top="40"
			 dragEnabled="true"
			 dropEnabled="true"
			 allowMultipleSelection="true"
			 allowDragSelection="true"
			 dragDrop="MusicTypeTree_dragDropHandler(event)"
		     dragEnter="MusicTypeTree_dragEnterHandler(event)"
			 ></mx:Tree>
	<s:TextInput id="nextName" x="432" y="40"/>
	<s:Button x="443" y="82" label="增加为哥" click="addBefore()"/>
	<s:Button x="443" y="111" label="增加为弟" click="addAfter()"/>
	<s:Button x="444" y="144" click="addSon()" label="增加为孩子"/>
	<s:Button x="444" y="178" click="editNode()" label="修改节点"/>
	<s:Button x="444" y="211" click="deleteNode()" label="删除节点"/>
	<s:Button x="443" y="244" click="selectNode()" label="选择节点"/>
	<s:Button x="443" y="277" click="closeAll()" label="全部收缩"/>
	<s:Button x="443" y="306" click="openAll()" label="全部展开"/>
	
</s:Application>

这次要说的是Flex的树组件的拖动效果，从树组件拖动到其他组件如List,DataGrid或者从其他组件拖动到Tree组件中,其实主要就是处理drag相关事件

第一：从Tree到List

示例一

Xml代码

<spanstyle="font-size: medium;"><?xmlversion="1.0"encoding="utf-8"?>
<s:Applicationxmlns: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">
<fx:Declarations>
<fx:XMLid="myData">
<data>
<itemlabel="ActionScript">
<itemlabel="Flash"/>
<itemlabel="Flex"/>
</item>
<itemlabel="Mirage">
</item>
<itemlabel="JavaScript"/>
</data>
</fx:XML>
<fx:XMLid="copyData">
<data>
<itemlabel="JavaScript"/>
</data>
</fx:XML>
</fx:Declarations>
<fx:Script>
<![CDATA[
import mx.controls.Button;
import mx.core.IUIComponent;
import mx.core.DragSource;
import mx.managers.DragManager;
import mx.events.DragEvent;
import mx.collections.ArrayCollection;
import mx.controls.Alert;
//拖动对象进入时
private function onDragOver( event:DragEvent ) : void
{
var dropTarget:Tree = Tree(event.currentTarget);
var r:int = dropTarget.calculateDropIndex(event);
lbl.text = '当前位置：'+r.toString();//哪一个节点在鼠标下并给出相应信息
tree2.selectedIndex = r; //显示位置
var node:XML = sourceTree.selectedItem as XML;
lbl2.text = '当前的拖动对象是:'+node.@label;//拖动对象的名字
if( node.@label == "ActionScript" ) {
DragManager.showFeedback(DragManager.NONE);
return;
}
// 键盘控制
if (event.ctrlKey)
DragManager.showFeedback(DragManager.COPY);//复制
else if (event.shiftKey)
DragManager.showFeedback(DragManager.LINK);//剪切
else {
DragManager.showFeedback(DragManager.MOVE);//移动
}
}
//拖动对象被抛出后
private function onDragDrop( event:DragEvent ) : void
{
// var ds:DragSource = event.dragSource;
var dropTarget:Tree = Tree(event.currentTarget);
// retrieve the data associated with the "items" format.
//var items:Array = ds.dataForFormat("items") as Array;
var r:int = tree2.calculateDropIndex(event);
tree2.selectedIndex = r;//当拖放完成后选定相应的节点
var node:XML = tree2.selectedItem as XML;
var p:*;
//tree2.dataDescriptor.hasChildren(node)判断有没有子节点,如果有就返回true
if( tree2.dataDescriptor.hasChildren(node) ) {
p = node;
r = 0;
trace('有子节点');
} else {
p = node.parent();
trace('没有子节点');
}
// taking all of the items in the DragSouce, insert them into the
// tree using parent p.
// for(var i:Number=0; i < items.length; i++) {
// var insert:XML = <node/>;
// insert.@label = items[i];
// insert.@type = "restaurant";
// tree2.dataDescriptor.addChildAt(p, insert, r+i);
// }
}
private function onDragComplete(event:DragEvent) : void
{
trace('stop');
tree2.selectedIndex = 0;
}
]]>
</fx:Script>
<mx:Labeltext="Label"id="lbl"x="439"y="120"/>
<mx:TreedropEnabled="true"dragEnabled="true"allowMultipleSelection="true"id="sourceTree"
dataProvider="{myData.item}"labelField="@label"x="114"y="146"/>
<mx:TreedropEnabled="true"id="tree2"dataProvider="{copyData.item}"labelField="@label"
dragOver="onDragOver(event)"dragDrop="onDragDrop(event)"dragComplete="onDragComplete(event)"x="382"y="146"/>
<mx:Labelx="382"y="94"text="Label"width="274"id="lbl2"height="29"/>
<mx:Labelx="218"y="62"text="Tree与Tree之间的拖动"width="139"height="19"/>
</s:Application>

<?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">
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
		<fx:XML id="myData">
			<data>
				<item label="ActionScript">
					<item label="Flash" />
					<item label="Flex" />
				</item>
				<item label="Mirage">
				</item>
				<item label="JavaScript"/>
			</data>
		</fx:XML>
		<fx:XML id="copyData">
			<data>
				<item label="JavaScript"/>
			</data>
		</fx:XML>
	</fx:Declarations>
	
	<fx:Script>
		<![CDATA[
			import mx.controls.Button;
			import mx.core.IUIComponent;
			import mx.core.DragSource;
			import mx.managers.DragManager;
			import mx.events.DragEvent;
			import mx.collections.ArrayCollection;
			import mx.controls.Alert;
			//拖动对象进入时
			private function onDragOver( event:DragEvent ) : void
			{
				var dropTarget:Tree = Tree(event.currentTarget);
				var r:int = dropTarget.calculateDropIndex(event);
				lbl.text = '当前位置：'+r.toString();//哪一个节点在鼠标下并给出相应信息
				tree2.selectedIndex = r; //显示位置
				var node:XML = sourceTree.selectedItem as XML;
				lbl2.text = '当前的拖动对象是:'+node.@label;//拖动对象的名字
				if( node.@label == "ActionScript" ) {
					DragManager.showFeedback(DragManager.NONE);
					return;
				}
				// 键盘控制 
				if (event.ctrlKey)
					DragManager.showFeedback(DragManager.COPY);//复制
				else if (event.shiftKey)
					DragManager.showFeedback(DragManager.LINK);//剪切
				else {
					DragManager.showFeedback(DragManager.MOVE);//移动
				}
			} 
			
			//拖动对象被抛出后
			private function onDragDrop( event:DragEvent ) : void
			{
				// var ds:DragSource = event.dragSource;
				var dropTarget:Tree = Tree(event.currentTarget);
				// retrieve the data associated with the "items" format.
				//var items:Array = ds.dataForFormat("items") as Array;
				var r:int = tree2.calculateDropIndex(event);
				tree2.selectedIndex = r;//当拖放完成后选定相应的节点
				var node:XML = tree2.selectedItem as XML;
				var p:*;
				//tree2.dataDescriptor.hasChildren(node)判断有没有子节点,如果有就返回true
				if( tree2.dataDescriptor.hasChildren(node) ) {
					p = node;
					r = 0;
					trace('有子节点');
				} else {
					p = node.parent();
					trace('没有子节点');
				}
				
				// taking all of the items in the DragSouce, insert them into the 
				// tree using parent p. 
				//       for(var i:Number=0; i < items.length; i++) {
				//             var insert:XML = <node/>;
				//             insert.@label = items[i];
				//             insert.@type = "restaurant";
				//             tree2.dataDescriptor.addChildAt(p, insert, r+i);
				//       }
			} 
			
			private function onDragComplete(event:DragEvent) : void
			{
				trace('stop');
				tree2.selectedIndex = 0;
			}

		]]>
	</fx:Script>

	
	<mx:Label text="Label" id="lbl" x="439" y="120"/>
	<mx:Tree dropEnabled="true" dragEnabled="true" allowMultipleSelection="true" id="sourceTree"
			 dataProvider="{myData.item}" labelField="@label" x="114" y="146"/>
	
	<mx:Tree dropEnabled="true" id="tree2" dataProvider="{copyData.item}" labelField="@label"
			 dragOver="onDragOver(event)" dragDrop="onDragDrop(event)" dragComplete="onDragComplete(event)" x="382" y="146"/>
	
	<mx:Label x="382" y="94" text="Label" width="274" id="lbl2" height="29"/>
	<mx:Label x="218" y="62" text="Tree与Tree之间的拖动" width="139" height="19"/>
</s:Application>

示例二

Xml代码

<spanstyle="font-size: medium;"><?xmlversion="1.0"encoding="utf-8"?>
<s:Applicationxmlns: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">
<fx:Declarations>
<fx:XMLListid="treeData">
<nodelabel="Mail Box">
<nodelabel="工区1">
<nodelabel="工地1">
<nodelabel="班组1.1"data="111"/>
<nodelabel="班组1.2"/>
</node>
<nodelabel="工地2">
<nodelabel="班组2.1"/>
<nodelabel="班组2.2"/>
</node>
<nodelabel="工地3">
<nodelabel="班组3.1"/>
<nodelabel="班组3.2"/>
</node>
</node>
<nodelabel="工区2">
<nodelabel="Professional"/>
<nodelabel="Personal"/>
</node>
</node>
</fx:XMLList>
</fx:Declarations>
<fx:Script>
<![CDATA[
import mx.controls.Label;
import mx.core.IUIComponent;
import mx.core.DragSource;
import mx.managers.DragManager;
import mx.events.DragEvent;
import mx.collections.ArrayCollection;
import mx.controls.Alert;
[Bindable]
public var list:ArrayCollection=new ArrayCollection();
//拖动初始器
private function dragSource(e:MouseEvent,format:String):void
{
var iu:IUIComponent = e.currentTarget as IUIComponent;
var ds:DragSource=new DragSource();
ds.addData(myTree.selectedItem,format);//为myTree设置一个标号forma
var lbl:Label=new Label();
lbl.text="开始拖动";
lbl.x = e.stageX;
lbl.y = e.stageY;
//lbl拖动的影子，默认为自己doDrag（拖动的对象，拖动器，事件，拖动影子，x,y）
DragManager.doDrag(iu,ds,e,lbl,e.stageX,e.stageY);//开始拖动这个物体
}
//当拖进去时
private function doDragEnter(e:DragEvent,format:String):void
{
var len:int=(mylist.dataProvider as ArrayCollection).length;//判断list中有多少个数据
var selectnode:XML = myTree.selectedItem as XML;//选择的节点名
for(var i:int=0;i<len;i++)
{
if(validateIsEqual((mylist.dataProvider as ArrayCollection).getItemAt(i),selectnode))
{
Alert.show("该班组已经存在！");
}
}
if(e.dragSource.hasFormat(format)){//如果标号为format则接受拖来的物体
DragManager.acceptDragDrop(IUIComponent(e.target));
}
}
//当拖完成时
private function onDragDrop(e:DragEvent,format:String):void{
var row:Object=e.dragSource.dataForFormat(format);
list.addItem(row);//list的数据源添加数据
}
//判断选中的节点是否和List中的内容一样
private function validateIsEqual(obj1:Object,obj2:Object):Boolean
{
if(obj1==obj2)//条件未判断
{
return true;
}
else
{
return false;
}
}
]]>
</fx:Script>
<mx:Treeid="myTree"labelField="@label"dragEnabled="true"mouseDown="dragSource(event,'stringFormat')"
showRoot="true"dataProvider="{treeData}" height="331"horizontalCenter="-120"verticalCenter="7"width="190"/>
<mx:Listheight="331"labelField="@label"dragEnter="doDragEnter(event,'stringFormat')"
dataProvider="{list}"dragDrop="onDragDrop(event,'stringFormat')"width="162"id="mylist"horizontalCenter="114"verticalCenter="7"></mx:List>
<mx:Labelx="282.5"y="97"text="Tree与list的拖动"width="152"/>
</s:Application>

<?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">
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
		<!-- 这里定义班组树的结构和内容 -->
		<fx:XMLList id="treeData">
			<node label="Mail Box">
				<node label="工区1">
					<node label="工地1">
						<node label="班组1.1" data="111"/>
						<node label="班组1.2"/>
					</node>
					<node label="工地2">
						<node label="班组2.1"/>
						<node label="班组2.2"/>
					</node>
					<node label="工地3">
						<node label="班组3.1"/>
						<node label="班组3.2"/>
					</node>
				</node>
				<node label="工区2">
					<node label="Professional"/>
					<node label="Personal"/>
				</node>
			</node>    
		</fx:XMLList>    
	</fx:Declarations>
	
	
	<fx:Script>
		<![CDATA[
			import mx.controls.Label;
			import mx.core.IUIComponent;
			import mx.core.DragSource;
			import mx.managers.DragManager;
			import mx.events.DragEvent;
			import mx.collections.ArrayCollection;
			import mx.controls.Alert;
			
			[Bindable]
			public var list:ArrayCollection=new ArrayCollection();
			
			//拖动初始器
			private function dragSource(e:MouseEvent,format:String):void
			{
				var iu:IUIComponent = e.currentTarget as IUIComponent;
				var ds:DragSource=new DragSource();
				ds.addData(myTree.selectedItem,format);//为myTree设置一个标号forma
				var lbl:Label=new Label(); 
				lbl.text="开始拖动";
				lbl.x = e.stageX;
				lbl.y = e.stageY;
				//lbl拖动的影子，默认为自己doDrag（拖动的对象，拖动器，事件，拖动影子，x,y）
				DragManager.doDrag(iu,ds,e,lbl,e.stageX,e.stageY);//开始拖动这个物体            
			}
			
			//当拖进去时
			private function doDragEnter(e:DragEvent,format:String):void
			{
				var len:int=(mylist.dataProvider as ArrayCollection).length;//判断list中有多少个数据
				var selectnode:XML = myTree.selectedItem as XML;//选择的节点名
				for(var i:int=0;i<len;i++)
				{
					if(validateIsEqual((mylist.dataProvider as ArrayCollection).getItemAt(i),selectnode))
					{
						Alert.show("该班组已经存在！");
					}
				}
				if(e.dragSource.hasFormat(format)){//如果标号为format则接受拖来的物体
					DragManager.acceptDragDrop(IUIComponent(e.target));
				}
			}
			
			//当拖完成时
			private function onDragDrop(e:DragEvent,format:String):void{
				var row:Object=e.dragSource.dataForFormat(format);
				list.addItem(row);//list的数据源添加数据
			}
			
			//判断选中的节点是否和List中的内容一样
			private function validateIsEqual(obj1:Object,obj2:Object):Boolean
			{
				if(obj1==obj2)//条件未判断
				{
					return true;
				}
				else
				{
					return false;
				}
			}
		]]>
	</fx:Script>
	<mx:Tree id="myTree" labelField="@label" dragEnabled="true" mouseDown="dragSource(event,'stringFormat')" 
			 showRoot="true" dataProvider="{treeData}"   height="331" horizontalCenter="-120" verticalCenter="7" width="190"/>
	
	<mx:List height="331" labelField="@label" dragEnter="doDragEnter(event,'stringFormat')"
			 dataProvider="{list}" dragDrop="onDragDrop(event,'stringFormat')" width="162" id="mylist" horizontalCenter="114" verticalCenter="7"></mx:List>
	<mx:Label x="282.5" y="97" text="Tree与list的拖动" width="152"/>
</s:Application>

第二：从Tree到DataGrid

Xml代码

<spanstyle="font-size: medium;"><?xmlversion="1.0"encoding="utf-8"?>
<s:Applicationxmlns: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">
<s:layout>
<s:BasicLayout/>
</s:layout>
<fx:Declarations>
<fx:XMLid="treeData"xmlns="">
<root>
<nodelabel="Massachusetts"type="state"data="MA">
<nodelabel="Boston"type="city">
<nodelabel="Smoke House Grill"type="restaurant"/>
<nodelabel="Equator"type="restaurant"/>
<nodelabel="Aquataine"type="restaurant"/>
<nodelabel="Grill 23"type="restaurant"/>
</node>
<nodelabel="Provincetown"type="city">
<nodelabel="Lobster Pot"type="restaurant"/>
<nodelabel="The Mews"type="restaurant"/>
</node>
</node>
<nodelabel="California"type="state"data="CA">
<nodelabel="San Francisco"type="city">
<nodelabel="Frog Lane"type="restaurant"/>
</node>
</node>
</root>
</fx:XML>
</fx:Declarations>
<fx:Script>
<![CDATA[
import mx.controls.Alert;
import mx.controls.Label;
import mx.controls.List;
import mx.collections.ArrayCollection;
import mx.core.DragSource;
import mx.controls.Tree;
import mx.controls.DataGrid;
import mx.controls.listClasses.ListBase;
import mx.events.DragEvent;
import mx.containers.Canvas;
import mx.managers.DragManager;
import mx.core.UIComponent;
[Bindable]
private var dataGridProvider:ArrayCollection = new ArrayCollection();
/**
* Handles the dragEnter event on the DataGrid control.
* If the dragInitiator is the Tree control, then only nodes of type "restaurant"
* are permitted to be dropped.
* Here you can see that by examining the dragSource you can determine if
* the control should accept the drop. The DataGrid control would not
* know how to treat a branch+children from the Tree control, so only leaf (restaurant)
* nodes are accepted.
*/
private function onDragEnter( event:DragEvent ) : void
{
if( event.dragInitiator is Tree ) {
var ds:DragSource = event.dragSource;
if( !ds.hasFormat("treeItems") ) return; // no useful data
var items:Array = ds.dataForFormat("treeItems") as Array;
for(var i:Number=0; i < items.length; i++) {
var item:XML = XML(items[i]);
if( item.@type != "restaurant" ) return; // not what we want
}
}
// If the Tree control passes or the dragInitiator is not a Tree control,
// accept the drop.
DragManager.acceptDragDrop(UIComponent(event.currentTarget));
}
/**
* Handles the dragOver event on the DataGrid control.
* If the dragInitiator is the Tree control, only copy is allowed. Otherwise, a move
* or link can take place from the List control.
*/
private function onDragOver( event:DragEvent ) : void
{
if( event.dragInitiator is Tree ) {
DragManager.showFeedback(DragManager.COPY);
} else {
if (event.ctrlKey)
DragManager.showFeedback(DragManager.COPY);
else if (event.shiftKey)
DragManager.showFeedback(DragManager.LINK);
else {
DragManager.showFeedback(DragManager.MOVE);
}
}
}
/**
* Handles the dragExit event on the drop target and just hides the
* the drop feedback.
*/
private function onDragExit( event:DragEvent ) : void
{
var dropTarget:ListBase=ListBase(event.currentTarget);
dropTarget.hideDropFeedback(event);
}
/**
* Handles the dragDrop event on the DataGrid when the
* drag proxy is released.
*/
private function onGridDragDrop( event:DragEvent ) : void
{
var ds:DragSource = event.dragSource;
var dropTarget:DataGrid = DataGrid(event.currentTarget);
var arr:Array;
if( ds.hasFormat("items") ) {
arr = ds.dataForFormat("items") as Array;
} else if( ds.hasFormat("treeItems") ) {
arr = ds.dataForFormat("treeItems") as Array;
}
for(var i:Number=0; i < arr.length; i++) {
var node:XML = XML(arr[i]);
var item:Object = new Object();
item.label = node.@label;
item.type = node.@type;
dataGridProvider.addItem(item);
}
onDragExit(event);
}
/**
* Intercepts the dragComplete event on the Tree control
* and prevents the default behavior from happening. This is necessary
* if the item being dragged from the Tree control is dropped on a non-Tree
* object, such as the DataGrid.
*/
private function onTreeDragComplete(event:DragEvent):void {
event.preventDefault();
}
/**
* Selects all of the items in the List if Ctrl+A is picked when the List control
* has focus.
*/
private function selectAllMaybe( event:KeyboardEvent ) : void
{
if( event.ctrlKey && event.keyCode == 65 ) {
var l:List = List(event.currentTarget);
var allItems:Array = new Array(l.dataProvider.length);
for(var i:Number=0; i < allItems.length; i++) {
allItems[i] = i;
}
l.selectedIndices = allItems;
}
}
]]>
</fx:Script>
<mx:Labelx="34"y="40"text="Drag items from this Tree"/>
<mx:Labelx="34"y="55"text="(items are copied)"/>
<mx:Treex="34"y="81"width="181"height="189"
dataProvider="{treeData.node}"
labelField="@label"
dropEnabled="false"
dragEnabled="true"
dragComplete="onTreeDragComplete(event)"
dragMoveEnabled="false"
/>
<mx:Labelx="291"y="55"text="Drop items from Tree here"/>
<mx:DataGridx="291"y="81"height="189"
dragEnabled="true"
dataProvider="{dataGridProvider}"
dragEnter="onDragEnter(event)"
dragOver="onDragOver(event)"
dragDrop="onGridDragDrop(event)"
dragExit="onDragExit(event)">
<mx:columns>
<mx:DataGridColumnheaderText="Label"dataField="label"/>
<mx:DataGridColumnheaderText="Type"dataField="type"/>
</mx:columns>
</mx:DataGrid>
</s:Application>

<?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">
	<s:layout>
		<s:BasicLayout/>
	</s:layout>
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
		<fx:XML id="treeData" xmlns="">
			<root>
				
				<node label="Massachusetts" type="state" data="MA">
					<node label="Boston" type="city" >
						<node label="Smoke House Grill" type="restaurant" />
						<node label="Equator" type="restaurant" />
						<node label="Aquataine" type="restaurant" />
						<node label="Grill 23" type="restaurant" />
						
					</node>
					<node label="Provincetown" type="city" >
						<node label="Lobster Pot" type="restaurant" />
						<node label="The Mews" type="restaurant" />
					</node>
				</node>
				
				<node label="California" type="state" data="CA">
					<node label="San Francisco" type="city" >
						<node label="Frog Lane" type="restaurant" />
					</node>
				</node>
			</root>
			
		</fx:XML>
	</fx:Declarations>
	<fx:Script>
		<![CDATA[
		import mx.controls.Alert;
		import mx.controls.Label;
		import mx.controls.List;
		import mx.collections.ArrayCollection;
		import mx.core.DragSource;
		import mx.controls.Tree;
		import mx.controls.DataGrid;
		import mx.controls.listClasses.ListBase;
		import mx.events.DragEvent;
		import mx.containers.Canvas;
		import mx.managers.DragManager;
		import mx.core.UIComponent;
		
		[Bindable]
		
		private var dataGridProvider:ArrayCollection = new ArrayCollection();
		/**
		* Handles the dragEnter event on the DataGrid control.
		* If the dragInitiator is the Tree control, then only nodes of type "restaurant"
		* are permitted to be dropped.
		* Here you can see that by examining the dragSource you can determine if
		* the control should accept the drop. The DataGrid control would not
		* know how to treat a branch+children from the Tree control, so only leaf (restaurant)
		* nodes are accepted.
		*/
		
		private function onDragEnter( event:DragEvent ) : void
		
		{            
		if( event.dragInitiator is Tree ) {
		var ds:DragSource = event.dragSource;
		if( !ds.hasFormat("treeItems") ) return;     // no useful data
		
		var items:Array = ds.dataForFormat("treeItems") as Array;
		for(var i:Number=0; i < items.length; i++) {
		
		var item:XML = XML(items[i]);
		if( item.@type != "restaurant" ) return; // not what we want
		
		}
		} 
		// If the Tree control passes or the dragInitiator is not a Tree control,
		// accept the drop.
		DragManager.acceptDragDrop(UIComponent(event.currentTarget)); 
		}        
		/**
		* Handles the dragOver event on the DataGrid control.
		* If the dragInitiator is the Tree control, only copy is allowed. Otherwise, a move
		* or link can take place from the List control.
		*/
		
		private function onDragOver( event:DragEvent ) : void
		
		{
		if( event.dragInitiator is Tree ) {
		DragManager.showFeedback(DragManager.COPY);
		} else {
		
		if (event.ctrlKey)
		DragManager.showFeedback(DragManager.COPY);
		else if (event.shiftKey)
		
		DragManager.showFeedback(DragManager.LINK);
		else {
		DragManager.showFeedback(DragManager.MOVE);
		}
		
		}
		}        
		/**
		* Handles the dragExit event on the drop target and just hides the 
		* the drop feedback.
		*/
		private function onDragExit( event:DragEvent ) : void
		
		{
		var dropTarget:ListBase=ListBase(event.currentTarget);   
		dropTarget.hideDropFeedback(event);
		}
		
		/**
		* Handles the dragDrop event on the DataGrid when the 
		* drag proxy is released. 
		*/
		private function onGridDragDrop( event:DragEvent ) : void
		
		{
		var ds:DragSource = event.dragSource;
		var dropTarget:DataGrid = DataGrid(event.currentTarget);
		var arr:Array;
		if( ds.hasFormat("items") ) {
		
		arr = ds.dataForFormat("items") as Array;
		} else if( ds.hasFormat("treeItems") ) {
		
		arr = ds.dataForFormat("treeItems") as Array;
		}
		for(var i:Number=0; i < arr.length; i++) {
		
		var node:XML = XML(arr[i]);
		var item:Object = new Object();
		item.label = node.@label;
		item.type  = node.@type;
		dataGridProvider.addItem(item);
		}
		
		onDragExit(event); 
		}
		/**
		* Intercepts the dragComplete event on the Tree control
		* and prevents the default behavior from happening. This is necessary
		* if the item being dragged from the Tree control is dropped on a non-Tree
		* object, such as the DataGrid.
		*/
		private function onTreeDragComplete(event:DragEvent):void {
		
		event.preventDefault();
		}        
		/**
		* Selects all of the items in the List if Ctrl+A is picked when the List control
		* has focus.
		*/
		private function selectAllMaybe( event:KeyboardEvent ) : void
		
		{
		if( event.ctrlKey && event.keyCode == 65 ) {
		
		var l:List = List(event.currentTarget);
		var allItems:Array = new Array(l.dataProvider.length);
		for(var i:Number=0; i < allItems.length; i++) {
		
		allItems[i] = i;
		}
		l.selectedIndices = allItems;
		}
		
		}
		]]>
	</fx:Script>
	<mx:Label x="34" y="40" text="Drag items from this Tree"/>
	<mx:Label x="34" y="55" text="(items are copied)"/>
	
	<mx:Tree x="34" y="81" width="181" height="189"
			 dataProvider="{treeData.node}"
			 labelField="@label"
			 dropEnabled="false"
			 dragEnabled="true"
			 dragComplete="onTreeDragComplete(event)"
			 dragMoveEnabled="false"
			 />
	
	<mx:Label x="291" y="55" text="Drop items from Tree here"/>
	<mx:DataGrid x="291" y="81" height="189"
				 dragEnabled="true"
				 dataProvider="{dataGridProvider}"
				 dragEnter="onDragEnter(event)"
				 dragOver="onDragOver(event)"
				 dragDrop="onGridDragDrop(event)"
				 dragExit="onDragExit(event)">
		
		<mx:columns>
			<mx:DataGridColumn headerText="Label" dataField="label"/>
			<mx:DataGridColumn headerText="Type" dataField="type"/>
			
		</mx:columns>
	</mx:DataGrid>
	
</s:Application>

第三：从List到Tree

Xml代码

<spanstyle="font-size: medium;"><?xmlversion="1.0"encoding="utf-8"?>
<s:Applicationxmlns: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">
<s:layout>
<s:BasicLayout/>
</s:layout>
<fx:Declarations>
<fx:XMLid="treeData"xmlns="">
<root>
<nodelabel="Massachusetts"type="state"data="MA">
<nodelabel="Boston"type="city">
<nodelabel="Smoke House Grill"type="restaurant"/>
<nodelabel="Equator"type="restaurant"/>
<nodelabel="Aquataine"type="restaurant"/>
<nodelabel="Grill 23"type="restaurant"/>
</node>
<nodelabel="Provincetown"type="city">
<nodelabel="Lobster Pot"type="restaurant"/>
<nodelabel="The Mews"type="restaurant"/>
</node>
</node>
<nodelabel="California"type="state"data="CA">
<nodelabel="San Francisco"type="city">
<nodelabel="Frog Lane"type="restaurant"/>
</node>
</node>
</root>
</fx:XML>
<fx:Arrayid="listData">
<fx:String>Johnny Rocket's</fx:String>
<fx:String>Jet Pizza</fx:String>
<fx:String>Steve's Greek</fx:String>
<fx:String>Sonsie</fx:String>
<fx:String>The Border Cafe</fx:String>
</fx:Array>
</fx:Declarations>
<fx:Script>
<![CDATA[
import mx.events.DragEvent;
import mx.managers.DragManager;
import mx.core.DragSource;
import mx.core.UIComponent;
import mx.controls.Tree;
/**
* Called as soon as the dragProxy enters the target. You can add logic
* to determine if the target will accept the drop based on the
* dragInitiator, the data available in the dragSource.
* Here the drop is blindly accepted.
*/
private function onDragEnter( event:DragEvent ) : void
{
DragManager.acceptDragDrop(UIComponent(event.currentTarget));
}
/**
* Called while the dragProxy is over the drop target. You can
* use this function to determine the type of feedback to show.
* Since the List is set to allow MOVE (the item is deleted
* once dropped), different feedback possibilities are given.
*
* Also, for this application, the Tree control node the dragProxy is
* over is selected. As the dragProxy moves, the Tree control's
* selection changes.
*
* For a bit more complication, the drop is being allowed
* only over nodes whose type is NOT 'state'.
* The feedback is removed.
*/
private function onDragOver( event:DragEvent ) : void
{
var dropTarget:Tree = Tree(event.currentTarget);
var r:int = dropTarget.calculateDropIndex(event);
tree.selectedIndex = r;
var node:XML = tree.selectedItem as XML;
if( node.@type == "state" ) {
DragManager.showFeedback(DragManager.NONE);
return;
}
if (event.ctrlKey)
DragManager.showFeedback(DragManager.COPY);
else if (event.shiftKey)
DragManager.showFeedback(DragManager.LINK);
else {
DragManager.showFeedback(DragManager.MOVE);
}
}
/**
* Called when the dragProxy is released
* over the drop target. The information in the dragSource
* is extracted and processed.
*
* The target node is determined and
* all of the data selected (the List has allowMultipleSection
* set) is added.
*/
private function onDragDrop( event:DragEvent ) : void
{
var ds:DragSource = event.dragSource;
var dropTarget:Tree = Tree(event.currentTarget);
var items:Array = ds.dataForFormat("items") as Array;
var r:int = tree.calculateDropIndex(event);
tree.selectedIndex = r;
var node:XML = tree.selectedItem as XML;
var p:*;
// if the selected node has children (it is type==city),
// then add the items at the beginning
if( tree.dataDescriptor.hasChildren(node) ) {
p = node;
r = 0;
} else {
p = node.parent();
}
for(var i:Number=0; i < items.length; i++) {
var insert:XML = <node />;
insert.@label = items[i];
insert.@type = "restaurant";
tree.dataDescriptor.addChildAt(p, insert, r+i);
}
}
/**
* Called when the drag operation completes, whether
* successfully or not. The tree is cleared of its
* selection.
*/
private function onDragComplete( event:DragEvent ) : void
{
tree.selectedIndex = -1;
}
]]>
</fx:Script>
<mx:Panelx="48"y="125"width="447"height="351"layout="absolute"title="Drag onto Tree">
<mx:Treewidth="186"left="10"top="10"bottom="10"id="tree"
labelField="@label"
dataProvider="{treeData.node}"
dropEnabled="false"
dragMoveEnabled="false"
dragEnter="onDragEnter(event)"
dragOver="onDragOver(event)"
dragDrop="onDragDrop(event)">
</mx:Tree>
<mx:Listwidth="188"height="206"right="10"bottom="10"id="list"
allowMultipleSelection="true"
dataProvider="{listData}"
dragEnabled="true"
dragMoveEnabled="true"
dragComplete="onDragComplete(event)">
</mx:List>
<mx:Textx="229"y="10"text="Drag from the list below to the tree"width="188"height="39"/>
<mx:Labelx="229"y="69"text="restaurants"/>
</mx:Panel>
</s:Application>

<?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">
	<s:layout>
		<s:BasicLayout/>
	</s:layout>
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
		<fx:XML id="treeData" xmlns="">
			
			<root>
				<node label="Massachusetts" type="state" data="MA">
					<node label="Boston" type="city" >
						<node label="Smoke House Grill" type="restaurant" />
						<node label="Equator" type="restaurant" />
						<node label="Aquataine" type="restaurant" />
						
						<node label="Grill 23" type="restaurant" />
					</node>
					<node label="Provincetown" type="city" >
						<node label="Lobster Pot" type="restaurant" />
						<node label="The Mews" type="restaurant" />
					</node>
					
				</node>
				<node label="California" type="state" data="CA">
					<node label="San Francisco" type="city" >
						<node label="Frog Lane" type="restaurant" />
					</node>
				</node>
				
			</root>
		</fx:XML>    
		<fx:Array id="listData">
			
			<fx:String>Johnny Rocket's</fx:String>
			
			<fx:String>Jet Pizza</fx:String>
			<fx:String>Steve's Greek</fx:String>
			<fx:String>Sonsie</fx:String>
			<fx:String>The Border Cafe</fx:String>
			
		</fx:Array>
	</fx:Declarations>
	<fx:Script>
		<![CDATA[
			import mx.events.DragEvent;
			import mx.managers.DragManager;
			import mx.core.DragSource;
			import mx.core.UIComponent;
			import mx.controls.Tree;
			/**
			 * Called as soon as the dragProxy enters the target. You can add logic
			 * to determine if the target will accept the drop based on the
			 * dragInitiator, the data available in the dragSource.
			 * Here the drop is blindly accepted.
			 */
			
			private function onDragEnter( event:DragEvent ) : void
				
			{
				DragManager.acceptDragDrop(UIComponent(event.currentTarget));
			}
			/**
			 * Called while the dragProxy is over the drop target. You can
			 * use this function to determine the type of feedback to show.
			 * Since the List is set to allow MOVE (the item is deleted
			 * once dropped), different feedback possibilities are given.
			 *
			 * Also, for this application, the Tree control node the dragProxy is
			 * over is selected. As the dragProxy moves, the Tree control's
			 * selection changes.
			 *
			 * For a bit more complication, the drop is being allowed
			 * only over nodes whose type is NOT 'state'.
			 * The feedback is removed.
			 */
			private function onDragOver( event:DragEvent ) : void
				
			{
				var dropTarget:Tree = Tree(event.currentTarget);
				var r:int = dropTarget.calculateDropIndex(event);
				tree.selectedIndex = r;
				var node:XML = tree.selectedItem as XML;
				if( node.@type == "state" ) {
					
					DragManager.showFeedback(DragManager.NONE);
					return;
				}
				if (event.ctrlKey)
					
					DragManager.showFeedback(DragManager.COPY);
				else if (event.shiftKey)
					DragManager.showFeedback(DragManager.LINK);
				else {
					
					DragManager.showFeedback(DragManager.MOVE);
				}
			}
			/**
			 * Called when the dragProxy is released
			 * over the drop target. The information in the dragSource
			 * is extracted and processed.
			 *
			 * The target node is determined and 
			 * all of the data selected (the List has allowMultipleSection
			 * set) is added.
			 */
			private function onDragDrop( event:DragEvent ) : void
				
			{
				var ds:DragSource = event.dragSource;
				var dropTarget:Tree = Tree(event.currentTarget);
				var items:Array = ds.dataForFormat("items") as Array;
				var r:int = tree.calculateDropIndex(event);
				tree.selectedIndex = r;
				var node:XML = tree.selectedItem as XML;
				var p:*;
				// if the selected node has children (it is type==city),
				
				// then add the items at the beginning
				if( tree.dataDescriptor.hasChildren(node) ) {
					p = node;
					r = 0;
				} else {
					
					p = node.parent();
				}
				for(var i:Number=0; i < items.length; i++) {
					
					var insert:XML = <node />;
					insert.@label = items[i];
					insert.@type  = "restaurant";
					tree.dataDescriptor.addChildAt(p, insert, r+i);
				}
				
			}
			/**
			 * Called when the drag operation completes, whether 
			 * successfully or not. The tree is cleared of its
			 * selection.
			 */
			private function onDragComplete( event:DragEvent ) : void
				
			{
				tree.selectedIndex = -1;
			}        
		]]>
	</fx:Script>

	<mx:Panel x="48" y="125" width="447" height="351" layout="absolute" title="Drag onto Tree">    
		<mx:Tree width="186" left="10" top="10" bottom="10" id="tree"
				 labelField="@label"
				 dataProvider="{treeData.node}"
				 dropEnabled="false"
				 dragMoveEnabled="false"
				 dragEnter="onDragEnter(event)"
				 dragOver="onDragOver(event)"
				 dragDrop="onDragDrop(event)">
			
		</mx:Tree>        
		<mx:List width="188" height="206" right="10" bottom="10" id="list"
				 allowMultipleSelection="true"
				 dataProvider="{listData}"
				 dragEnabled="true"
				 dragMoveEnabled="true"
				 dragComplete="onDragComplete(event)">
			
		</mx:List>        
		<mx:Text x="229" y="10" text="Drag from the list below to the tree" width="188" height="39"/>
		
		<mx:Label x="229" y="69" text="restaurants"/>
	</mx:Panel>    
</s:Application>

第四：Tree 到Tree及综合拖动示例

Xml代码

<spanstyle="font-size: medium;"><?xmlversion="1.0"encoding="utf-8"?>
<s:Applicationxmlns: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:com="com.*">
<s:layout>
<s:BasicLayout/>
</s:layout>
<fx:Script>
<![CDATA[
import mx.controls.listClasses.ListBase;
import mx.core.UIComponent;
import mx.controls.Tree;
import mx.collections.ArrayCollection;
import mx.core.DragSource;
import mx.managers.DragManager;
import mx.events.DragEvent;
import mx.events.TreeEvent;
import flash.events.KeyboardEvent;
import flash.events.MouseEvent;
import flash.events.Event;
import mx.utils.ObjectUtil;
[Bindable]
public var selectedNode:Object;
[Bindable]
public var description:String = "Directions: To see the effect of the Spring Loaded Folders select " +
"an item in the tree and drag the item over the folders wait, hovering over the folder and " +
"it'll open. If a folder opens and you did not want it to open move the mouse out of " +
"the tree, and it'll restore the original state. Play around with the delay to get a " +
"desired delay.Hitting spacebar while dragging over a closed folder will open it immediately.";
public function treeChanged(event:Event):void {
selectedNode=event.currentTarget.selectedItem;
}
private function onDragOver(event:DragEvent):void{
try{
if( event.dragInitiator is ListBase ){
var list:ListBase = event.dragInitiator as ListBase;
if( event.currentTarget != event.dragInitiator){
//do what?
//trace(mx.utils.ObjectUtil.toString('[currentTarget]'+event.currentTarget));
}
if(list.indexToItemRenderer(list.calculateDropIndex(event)) != null){
var currTree:Tree = Tree(event.currentTarget);
var currNodeOver:Object;
var rowIndex:int = currTree.calculateDropIndex(event);
var hoverTarget:Object = currTree.indexToItemRenderer(rowIndex).data;
var parent:Object = currTree.getParentItem(hoverTarget);
var tattlerStr:String = new String();
var halfRow:int = currTree.rowHeight/2;
var certerRowY:int = (rowIndex*currTree.rowHeight)+halfRow;
var bottomRowY:int = (rowIndex+1)*currTree.rowHeight;
currNodeOver = currTree.indexToItemRenderer(rowIndex).data;
DragManager.showFeedback(DragManager.MOVE);
currTree.showDropFeedback(event);
//trace(ObjectUtil.toString(parent));
if( parent != null )
trace('[currTree is a tree]');
//parent.label = 'currTree is a tree';
//parentObject = currTree.getParentItem(hoverTarget);
else
trace('[currTree is a tree]');
//parent.label = 'currTree is not a tree';
//parentObject.label = 'currTree is not a tree';
tattlerStr = "Selected Item: " + selectedNode + " " + "Over Target: " + hoverTarget.level
+ " " + "Target Parent: " + 'test'//parent.label
+ " "
+ "calculateDropIndex " + rowIndex
+ " "
+ "halfRow " + halfRow.toString()
+ " "
+ "certerRowY " + certerRowY.toString()
+ " "
+ "bottomRowY " + bottomRowY.toString()
+ " "
+ "mouseY " + currTree.mouseY.toString()
+ " "
+ "isItemOpen " + currTree.isItemOpen(currNodeOver).toString()
+ " " + " ";
tattler.text = tattlerStr;
}else{
tattler.text = "No Drop Buddy";
}
}
}catch(err:Error){
trace('[error]'+err);
}
}
private function onDragDrop(event:DragEvent):void{
try{
var target:Tree = Tree(event.currentTarget);
var list:ListBase = event.dragInitiator as ListBase;
var ds:DragSource = event.dragSource;
var rowIndex:int = target.calculateDropIndex(event);
var hoverTarget:Object = target.indexToItemRenderer(rowIndex).data;
var parent:Object = target.getParentItem(hoverTarget);
var items:Array = ds.dataForFormat("items") as Array;
var i:int;
//trace(event.dragInitiator);
if( event.dragInitiator is DataGrid ){
//do what?
//trace(mx.utils.ObjectUtil.toString('[currentTarget]'+event.currentTarget));
for (i=0; i < items.length; i++){
var tempObj:Object = {};
tempObj = items[i];
parent.children.addItem(tempObj);
}
event.preventDefault();
}
}catch(err:Error){
trace('[onDragDropError]'+err);
}
}
private function onDragEnter(event:DragEvent):void{
DragManager.acceptDragDrop(UIComponent(event.currentTarget));
}
[Bindable]
private var treeData:ArrayCollection = new ArrayCollection(
[ {label:"Curriculum", level:"Curr", children:new ArrayCollection(
[ {label:"cert1", level:"Cert", children:new ArrayCollection(
[{label:"c1", level:"Course", type:"prereq"},
{label:"c2", level:"Course", type:"prereq"}
])}
])},{label:"Curriculum", level:"Curr", children:new ArrayCollection(
[ {label:"cert1", level:"Cert", children:new ArrayCollection(
[{label:"c1", level:"Course", type:"prereq"},
{label:"c2", level:"Course", type:"prereq"}
])}
])}
]);
[Bindable]
private var secondTreeData:ArrayCollection = new ArrayCollection(
[ {label:"Curriculum", level:"Curr", children:new ArrayCollection(
[ {label:"cert1", level:"Cert", children:new ArrayCollection(
[{label:"c1", level:"Course", type:"prereq"},
{label:"c2", level:"Course", type:"prereq"}
])}
])},{label:"Curriculum", level:"Curr", children:new ArrayCollection(
[ {label:"cert1", level:"Cert", children:new ArrayCollection(
[{label:"c1", level:"Course", type:"prereq"},
{label:"c2", level:"Course", type:"prereq"}
])}
])}
]);
[Bindable]
private var gridDP:ArrayCollection = new ArrayCollection(
[{label:"c5", level:"Course", type:"prereq"},
{label:"c6", level:"Course", type:"prereq"},
{label:"c7", level:"Course", type:"prereq"}]);
]]>
</fx:Script>
<fx:Declarations>
</fx:Declarations>
<mx:VBoxwidth="100%"height="100%">
<mx:CanvasbackgroundColor="#f3d7ab"borderColor="#000000"borderStyle="outset"width="100%"x="10"height="50%"y="10"horizontalScrollPolicy="off"verticalScrollPolicy="off">
<mx:HBoxwidth="100%"height="100%">
<com:SpringLoadedTreeid="tree1"width="35%"height="100%"
autoCloseOpenNodes="{autoCloseOpenNodes.selected}"
autoCloseOnDrop="{autoCloseOnDrop.selected}"
autoOpenTimerMS="{DelayOpen.value}"
autoCloseTimerMS="{DelayClose.value}"
showOpeningIndication="{showOpenIdication.selected}"
autoCloseOnExit="{autoCloseOnExit.selected}"
dataProvider="{treeData}"
mouseDown="treeChanged(event)"
fontWeight="bold"color="#000000"
dragEnabled="true"
dragOver="onDragOver(event)"
dragMoveEnabled="true"
dropEnabled="true"
labelField="label"wordWrap="true"
fontSize="8"variableRowHeight="true"
x="41"y="20"/>
<com:SpringLoadedTreeid="tree2"width="35%"height="100%"
autoCloseOpenNodes="{autoCloseOpenNodes.selected}"
autoCloseOnDrop="{autoCloseOnDrop.selected}"
autoOpenTimerMS="{DelayOpen.value}"
autoCloseTimerMS="{DelayClose.value}"
showOpeningIndication="{showOpenIdication.selected}"
autoCloseOnExit="{autoCloseOnExit.selected}"
dataProvider="{secondTreeData}"
mouseDown="treeChanged(event)"
fontWeight="bold"color="#000000"
dragEnabled="true"
showRoot="false"
dragDrop="onDragDrop(event)"
dragEnter="onDragEnter(event)"
dragOver="onDragOver(event)"
dragMoveEnabled="true"
dropEnabled="true"
labelField="label"wordWrap="true"
fontSize="8"variableRowHeight="true"
x="41"y="20"/>
<mx:DataGriddataProvider="{gridDP}"id="grid1"
dragEnabled="true"
dragMoveEnabled="true"height="100%">
</mx:DataGrid>
<mx:Texttext="{description}"id="Directions"enabled="true"height="100%"width="30%"/>
</mx:HBox>
</mx:Canvas>
<mx:HBoxwidth="100%"height="50%">
<mx:TextAreax="10"y="368"width="50%"height="100%"id="tattler"/>
<mx:Canvaswidth="50%"height="100%"y="446"x="470">
<mx:CheckBoxid="autoCloseOnDrop"selected="true"label="Return to original state on drop"left="10"right="10"bottom="96"/>
<mx:HSlidervalue="1000"tickInterval="200"snapInterval="200"maximum="2000"allowTrackClick="true"minimum="200"id="DelayOpen"left="255"bottom="174"width="190"/>
<mx:Labeltext="Folder auto open delay ms:{DelayOpen.value}"left="10"bottom="174"textAlign="left"width="248"/>
<mx:CheckBoxid="showOpenIdication"selected="true"label="Show opening indication"left="10"right="10"bottom="122"/>
<mx:HSlidervalue="200"tickInterval="100"snapInterval="100"maximum="1000"allowTrackClick="true"minimum="100"id="DelayClose"bottom="200"width="190"left="255"/>
<mx:Labeltext="Folder auto close delay ms:{DelayClose.value}"left="10"bottom="200"textAlign="left"width="248"/>
<mx:CheckBoxid="autoCloseOpenNodes"selected="true"label="Auto open/close folders on drag over/out"left="10"right="10"bottom="148"/>
<mx:CheckBoxid="autoCloseOnExit"selected="true"label="Auto close folders on tree exit"left="10"right="10"bottom="70"/>
</mx:Canvas>
</mx:HBox>
</mx:VBox>
</s:Application>

<?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:com="com.*">
	<s:layout>
		<s:BasicLayout/>
	</s:layout>
	<fx:Script>
		<![CDATA[
			import mx.controls.listClasses.ListBase;
			import mx.core.UIComponent;
			import mx.controls.Tree;
			import mx.collections.ArrayCollection;
			import mx.core.DragSource;
			import mx.managers.DragManager;
			import mx.events.DragEvent;
			import mx.events.TreeEvent;
			import flash.events.KeyboardEvent;
			import flash.events.MouseEvent;
			import flash.events.Event;
			import mx.utils.ObjectUtil;
			
			
			
			[Bindable]
			public var selectedNode:Object;
			
			[Bindable]
			public var description:String = "Directions:

To see the effect of the Spring Loaded Folders select " + 
				"an item in the tree and drag the item over the folders wait, hovering over the folder and " + 
				"it'll open.

If a folder opens and you did not want it to open move the mouse out of " + 
				"the tree, and it'll restore the original state. 

Play around with the delay to get a " + 
				"desired delay.Hitting spacebar while dragging over a closed folder will open it immediately.";
			
			
			public function treeChanged(event:Event):void {
				selectedNode=event.currentTarget.selectedItem;
			}
			
			private function onDragOver(event:DragEvent):void{
				try{
					if( event.dragInitiator is ListBase ){
						var list:ListBase = event.dragInitiator as ListBase;
						if( event.currentTarget != event.dragInitiator){
							//do what?
							//trace(mx.utils.ObjectUtil.toString('[currentTarget]'+event.currentTarget));
						}
						if(list.indexToItemRenderer(list.calculateDropIndex(event)) != null){
							var currTree:Tree = Tree(event.currentTarget);
							var currNodeOver:Object;
							var rowIndex:int = currTree.calculateDropIndex(event);
							var hoverTarget:Object = currTree.indexToItemRenderer(rowIndex).data;
							var parent:Object = currTree.getParentItem(hoverTarget);
							var tattlerStr:String = new String();
							var halfRow:int = currTree.rowHeight/2;
							var certerRowY:int = (rowIndex*currTree.rowHeight)+halfRow;
							var bottomRowY:int = (rowIndex+1)*currTree.rowHeight;
							
							currNodeOver = currTree.indexToItemRenderer(rowIndex).data;
							
							DragManager.showFeedback(DragManager.MOVE);
							currTree.showDropFeedback(event);
							
							//trace(ObjectUtil.toString(parent));
							if( parent != null )
								trace('[currTree is a tree]');
								//parent.label = 'currTree is a tree';
								//parentObject = currTree.getParentItem(hoverTarget);
							else
								trace('[currTree is a tree]');
							//parent.label = 'currTree is not a tree';
							//parentObject.label = 'currTree is not a tree';
							
							tattlerStr = "Selected Item: " + selectedNode + "
" + "Over Target: " + hoverTarget.level
								+ "
" + "Target Parent: " + 'test'//parent.label
								+ "
"
								+ "calculateDropIndex " + rowIndex
								+ "
" 
								+ "halfRow " + halfRow.toString()
								+ "
"
								+ "certerRowY " + certerRowY.toString()
								+ "
"
								+ "bottomRowY " + bottomRowY.toString()
								+ "
" 
								+ "mouseY " + currTree.mouseY.toString()
								+ "
"
								+ "isItemOpen " + currTree.isItemOpen(currNodeOver).toString()
								+ "
" + "
";
							
							tattler.text = tattlerStr;
						}else{
							tattler.text = "No Drop Buddy";
						}
					}
				}catch(err:Error){
					trace('[error]'+err);
				}
				
			}
			
			private function onDragDrop(event:DragEvent):void{
				try{
					var target:Tree = Tree(event.currentTarget);
					var list:ListBase = event.dragInitiator as ListBase;
					var ds:DragSource = event.dragSource;
					var rowIndex:int = target.calculateDropIndex(event);
					var hoverTarget:Object = target.indexToItemRenderer(rowIndex).data;
					var parent:Object = target.getParentItem(hoverTarget);
					var items:Array = ds.dataForFormat("items") as Array;
					var i:int;
					
					//trace(event.dragInitiator);
					if( event.dragInitiator is DataGrid ){
						//do what?
						//trace(mx.utils.ObjectUtil.toString('[currentTarget]'+event.currentTarget));
						for (i=0; i < items.length; i++){
							var tempObj:Object = {};
							tempObj = items[i];
							parent.children.addItem(tempObj);
						}
						
						event.preventDefault();
					}
				}catch(err:Error){
					trace('[onDragDropError]'+err);
				}
				
			}
			
			
			private function onDragEnter(event:DragEvent):void{
				DragManager.acceptDragDrop(UIComponent(event.currentTarget));
			}
			[Bindable]
			private var treeData:ArrayCollection = new ArrayCollection(
				[ {label:"Curriculum", level:"Curr", children:new ArrayCollection(
					[ {label:"cert1", level:"Cert", children:new ArrayCollection(
						[{label:"c1", level:"Course", type:"prereq"},
							{label:"c2", level:"Course", type:"prereq"} 
						])}
					])},{label:"Curriculum", level:"Curr", children:new ArrayCollection(
						[ {label:"cert1", level:"Cert", children:new ArrayCollection(
							[{label:"c1", level:"Course", type:"prereq"},
								{label:"c2", level:"Course", type:"prereq"} 
							])}
						])}
				]);
			
			[Bindable]
			private var secondTreeData:ArrayCollection = new ArrayCollection(
				[ {label:"Curriculum", level:"Curr", children:new ArrayCollection(
					[ {label:"cert1", level:"Cert", children:new ArrayCollection(
						[{label:"c1", level:"Course", type:"prereq"},
							{label:"c2", level:"Course", type:"prereq"} 
						])}
					])},{label:"Curriculum", level:"Curr", children:new ArrayCollection(
						[ {label:"cert1", level:"Cert", children:new ArrayCollection(
							[{label:"c1", level:"Course", type:"prereq"},
								{label:"c2", level:"Course", type:"prereq"} 
							])}
						])}
				]);
			
			
			[Bindable]
			private var gridDP:ArrayCollection = new ArrayCollection(
				[{label:"c5", level:"Course", type:"prereq"},
					{label:"c6", level:"Course", type:"prereq"},
					{label:"c7", level:"Course", type:"prereq"}]);
		]]>
	</fx:Script>
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
	</fx:Declarations>
	<mx:VBox width="100%" height="100%">
		<mx:Canvas backgroundColor="#f3d7ab" borderColor="#000000" borderStyle="outset" width="100%" x="10" height="50%" y="10" horizontalScrollPolicy="off" verticalScrollPolicy="off">
			
			<mx:HBox width="100%" height="100%" >
				<com:SpringLoadedTree id="tree1" width="35%" height="100%"
									autoCloseOpenNodes="{autoCloseOpenNodes.selected}" 
									autoCloseOnDrop="{autoCloseOnDrop.selected}" 
									autoOpenTimerMS="{DelayOpen.value}" 
									autoCloseTimerMS="{DelayClose.value}" 
									showOpeningIndication="{showOpenIdication.selected}" 
									autoCloseOnExit="{autoCloseOnExit.selected}" 
									dataProvider="{treeData}"
									mouseDown="treeChanged(event)"
									fontWeight="bold" color="#000000"
									dragEnabled="true" 
									dragOver="onDragOver(event)"
									dragMoveEnabled="true"
									dropEnabled="true"
									labelField="label" wordWrap="true"
									fontSize="8" variableRowHeight="true"
									x="41" y="20"/>
				
				<com:SpringLoadedTree id="tree2" width="35%" height="100%"
									autoCloseOpenNodes="{autoCloseOpenNodes.selected}" 
									autoCloseOnDrop="{autoCloseOnDrop.selected}" 
									autoOpenTimerMS="{DelayOpen.value}" 
									autoCloseTimerMS="{DelayClose.value}" 
									showOpeningIndication="{showOpenIdication.selected}" 
									autoCloseOnExit="{autoCloseOnExit.selected}" 
									dataProvider="{secondTreeData}"
									mouseDown="treeChanged(event)"
									fontWeight="bold" color="#000000"
									dragEnabled="true" 
									showRoot="false"
									dragDrop="onDragDrop(event)"
									dragEnter="onDragEnter(event)"
									dragOver="onDragOver(event)"
									dragMoveEnabled="true"
									dropEnabled="true"
									labelField="label" wordWrap="true"
									fontSize="8" variableRowHeight="true"
									x="41" y="20"/>
				
				
				<mx:DataGrid dataProvider="{gridDP}" id="grid1" 
							 dragEnabled="true"
							 dragMoveEnabled="true" height="100%">
				</mx:DataGrid>
				
				<mx:Text text="{description}" id="Directions" enabled="true" height="100%" width="30%"/>
				
				
			</mx:HBox>
		</mx:Canvas>
		<mx:HBox width="100%" height="50%">
			<mx:TextArea x="10" y="368" width="50%" height="100%" id="tattler"/>
			<mx:Canvas width="50%" height="100%" y="446" x="470">
				<mx:CheckBox id="autoCloseOnDrop" selected="true" label="Return to original state on drop" left="10" right="10" bottom="96"/>
				<mx:HSlider value="1000" tickInterval="200" snapInterval="200" maximum="2000" allowTrackClick="true" minimum="200" id="DelayOpen" left="255" bottom="174" width="190"/>
				<mx:Label text="Folder auto open delay ms:{DelayOpen.value}" left="10" bottom="174" textAlign="left" width="248"/>
				<mx:CheckBox id="showOpenIdication" selected="true" label="Show opening indication" left="10" right="10" bottom="122"/>
				
				<mx:HSlider value="200" tickInterval="100" snapInterval="100" maximum="1000" allowTrackClick="true" minimum="100" id="DelayClose" bottom="200" width="190" left="255"/>
				<mx:Label text="Folder auto close delay ms:{DelayClose.value}" left="10" bottom="200" textAlign="left" width="248"/>
				<mx:CheckBox id="autoCloseOpenNodes" selected="true" label="Auto open/close folders on drag over/out" left="10" right="10" bottom="148"/>
				<mx:CheckBox id="autoCloseOnExit" selected="true" label="Auto close folders on tree exit" left="10" right="10" bottom="70"/>
			</mx:Canvas>
		</mx:HBox>
	</mx:VBox>
</s:Application>

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原文地址：https://www.cnblogs.com/regalys168/p/3626844.html