不用说什么了，需要两个文件：
CheckTree.as
package ht
{
import mx.controls.Tree;
import mx.core.ClassFactory;
import mx.events.ListEvent;
/**
* 三状态复选框树控件
* <br /><br />
*/
public class CheckTree extends Tree
{
//数据源中状态字段
private var m_checkBoxStateField:String="@state";
//部分选中的填充色
[Bindable]
private var m_checkBoxBgColor:uint=0x009900;
//填充色的透明度
[Bindable]
private var m_checkBoxBgalpha:Number=1;
//填充色的边距
[Bindable]
private var m_checkBoxBgPadding:Number=3;
//填充色的四角弧度
[Bindable]
private var m_checkBoxBgElips:Number=2;
//取消选择是否收回子项
[Bindable]
private var m_checkBoxCloseItemsOnUnCheck:Boolean=true;
//选择项时是否展开子项
[Bindable]
private var m_checkBoxOpenItemsOnCheck:Boolean=false;
//选择框左边距的偏移量
[Bindable]
private var m_checkBoxLeftGap:int=8;
//选择框右边距的偏移量
[Bindable]
private var m_checkBoxRightGap:int=20;
//是否显示三状态
[Bindable]
private var m_checkBoxEnableState:Boolean=true;
//与父项子项关联
[Bindable]
private var m_checkBoxCascadeOnCheck:Boolean=true;
//双击项目
public var itemDClickSelect:Boolean=true;
public function CheckTree()
{
super();
doubleClickEnabled=true;
}
override protected function createChildren():void
{
var myFactory:ClassFactory=new ClassFactory(CheckTreeRenderer);
this.itemRenderer=myFactory;
super.createChildren();
addEventListener(ListEvent.ITEM_DOUBLE_CLICK,onItemDClick);
}
public function PropertyChange():void
{
dispatchEvent(new ListEvent(mx.events.ListEvent.CHANGE));
}
/**
* 树菜单，双击事件
* @param evt 双击事件源
*
*/
public function onItemDClick(e:ListEvent):void
{
if(itemDClickSelect)
OpenItems();
}
/**
* 打开Tree节点函数，被 有打开节点功能的函数调用
* @param item 要打开的节点
*
*/
public function OpenItems():void
{
if (this.selectedindex >= 0 && this.dataDescriptor.isBranch(this.selectedItem))
this.expandItem(this.selectedItem,!this.isItemOpen(this.selectedItem),true);
}
/**
* 数据源中状态字段
* @return
*
*/
[Bindable]
public function get checkBoxStateField():String
{
return m_checkBoxStateField;
}
public function set checkBoxStateField(v:String):void
{
m_checkBoxStateField=v;
PropertyChange();
}
/**
* 部分选中的填充色
* @return
*
*/
[Bindable]
public function get checkBoxBgColor():uint
{
return m_checkBoxBgColor;
}
public function set checkBoxBgColor(v:uint):void
{
m_checkBoxBgColor=v;
PropertyChange();
}
/**
* 填充色的透明度
* @return
*
*/
[Bindable]
public function get checkBoxBgalpha():Number
{
return m_checkBoxBgalpha;
}
public function set checkBoxBgalpha(v:Number):void
{
m_checkBoxBgalpha=v;
PropertyChange();
}
/**
* 填充色的边距
* @return
*
*/
[Bindable]
public function get checkBoxBgPadding():Number
{
return m_checkBoxBgPadding;
}
public function set checkBoxBgPadding(v:Number):void
{
m_checkBoxBgPadding=v;
PropertyChange();
}
/**
* 填充色的四角弧度
* @return
*
*/
[Bindable]
public function get checkBoxBgElips():Number
{
return m_checkBoxBgElips;
}
public function set checkBoxBgElips(v:Number):void
{
m_checkBoxBgElips=v;
PropertyChange();
}
/**
* 取消选择是否收回子项
* @return
*
*/
[Bindable]
public function get checkBoxCloseItemsOnUnCheck():Boolean
{
return m_checkBoxCloseItemsOnUnCheck;
}
public function set checkBoxCloseItemsOnUnCheck(v:Boolean):void
{
m_checkBoxCloseItemsOnUnCheck=v;
PropertyChange();
}
/**
* 选择项时是否展开子项
* @return
*
*/
[Bindable]
public function get checkBoxOpenItemsOnCheck():Boolean
{
return m_checkBoxOpenItemsOnCheck;
}
public function set checkBoxOpenItemsOnCheck(v:Boolean):void
{
m_checkBoxOpenItemsOnCheck=v;
PropertyChange();
}
/**
* 选择框左边距的偏移量
* @return
*
*/
[Bindable]
public function get checkBoxLeftGap():int
{
return m_checkBoxLeftGap;
}
public function set checkBoxLeftGap(v:int):void
{
m_checkBoxLeftGap=v;
PropertyChange();
}
/**
* 选择框右边距的偏移量
* @return
*
*/
[Bindable]
public function get checkBoxRightGap():int
{
return m_checkBoxRightGap;
}
public function set checkBoxRightGap(v:int):void
{
m_checkBoxRightGap=v;
PropertyChange();
}
/**
* 是否显示三状态
* @return
*
*/
[Bindable]
public function get checkBoxEnableState():Boolean
{
return m_checkBoxEnableState;
}
public function set checkBoxEnableState(v:Boolean):void
{
m_checkBoxEnableState=v;
PropertyChange();
}
/**
* 与父项子项关联
* @return
*
*/
[Bindable]
public function get checkBoxCascadeOnCheck():Boolean
{
return m_checkBoxCascadeOnCheck;
}
public function set checkBoxCascadeOnCheck(v:Boolean):void
{
m_checkBoxCascadeOnCheck=v;
PropertyChange();
}
}
}
CheckTreeRenderer.as
package ht
{
import <b>f</b>lash.events.MouseEvent;
import <b>f</b>lash.geom.Rectangle;
import <b>f</b>lash.xml.*;
import mx.collections.*;
import mx.controls.CheckBox;
import mx.controls.Tree;
import mx.controls.listClasses.*;
import mx.controls.treeClasses.*;
import mx.events.FlexEvent;
import mx.events.ListEvent;
/**
* 三状态复选框树控件
* <br /><br />
*/
public class CheckTreeRenderer extends TreeItemRenderer
{
protected var myCheckBox:CheckBox;
/**
* STATE_SCHRODINGER : 部分子项选中 <br />
* STATE_CHECKED : 全部子项选中 <br />
* STATE_UNCHECKED : 全部子项未选中 <br />
*/
static private var STATE_SCHRODINGER:int=2;
static private var STATE_CHECKED:int=1;
static private var STATE_UNCHECKED:int=0;
private var myTree:CheckTree;
public function CheckTreeRenderer()
{
super();
mouseEnabled=true;
}
/**
* 初始化完成时处理复选框和图片对象
*
*/
override protected function createChildren():void
{
myCheckBox=new CheckBox();
addChild(myCheckBox);
myCheckBox.addEventListener(MouseEvent.CLICK,checkBoxToggleHandler);
myTree = this.owner as CheckTree;
super.createChildren();
myTree.addEventListener(ListEvent.CHANGE,onPropertyChange);
}
protected function onPropertyChange(e:ListEvent=null):void
{
this.updatedisplayList(unscaledWidth,unscaledHeight);
}
/**
* // Todo : 递归设置父项目的状态
* @param item 项目
* @param tree 树对象
* @param state 目标状态
*
*/
private function toggleParents(item:Object,tree:Tree,state:int):void
{
if (item == null)
return ;
else
{
var stateField:String=myTree.checkBoxStateField;
var tmpTree:IList=myTree.dataProvider as IList;
var oldValue:Number=item[stateField] as Number;
var newValue:Number=state as Number;
item[myTree.checkBoxStateField]=state;
tmpTree.itemUpdated(item,stateField,oldValue,newValue);
//item[myTree.checkBoxStateField]=state;
var parentItem:Object=tree.getParentItem(item);
if(null!=parentItem)
toggleParents(parentItem,tree,getState(tree,parentItem));
}
}
/**
* // Todo : 设置项目的状态和子项的状态
* @param item 项目
* @param tree 树对象
* @param state 目标状态
*
*/
private function toggleChildren(item:Object,newValue);
var treeData:ITreeDataDescriptor=tree.dataDescriptor;
if (myTree.checkBoxCascadeOnCheck && treeData.hasChildren(item))
{
var children:ICollectionView=treeData.getChildren(item);
var cursor:IViewCursor=children.createCursor();
while(!cursor.afterLast)
{
toggleChildren(cursor.current,state);
cursor.moveNext();
}
}
}
}
/**
* //Todo:获得parent的状态
* @param tree 树对象
* @param parent 目标项
* @return 状态
*
*/
private function getState(tree:Tree,parent:Object):int
{
var noChecks:int=0;
var noCats:int=0;
var noUnChecks:int=0;
if (parent != null)
{
var treeData:ITreeDataDescriptor=tree.dataDescriptor;
var cursor:IViewCursor=treeData.getChildren(parent).createCursor();
while(!cursor.afterLast)
{
if (cursor.current[myTree.checkBoxStateField] == STATE_CHECKED)
noChecks++;
else if (cursor.current[myTree.checkBoxStateField] == STATE_UNCHECKED)
noUnChecks++;
else
noCats++;
cursor.moveNext();
}
}
if ((noChecks > 0 && noUnChecks > 0) || noCats > 0)
return STATE_SCHRODINGER;
else if (noChecks > 0)
return STATE_CHECKED;
else
return STATE_UNCHECKED;
}
/**
* //Todo:设置项目的父项状态和子项状态
* @param event 事件
*
*/
private function checkBoxToggleHandler(event:MouseEvent):void
{
if (data)
{
var myListData:TreeListData=TreeListData(this.listData);
var selectednode:Object=myListData.item;
myTree=myListData.owner as CheckTree;
var toggle:Boolean=myCheckBox.selected;
if (toggle)
{
toggleChildren(data,myTree,STATE_CHECKED);
if (myTree.checkBoxOpenItemsOnCheck)
myTree.expandChildrenOf(data,true);
}
else
{
toggleChildren(data,STATE_UNCHECKED);
if (myTree.checkBoxCloseItemsOnUnCheck)
myTree.expandChildrenOf(data,false);
}
//Todo:如果所有子项选中时需要选中父项则执行以下代码
if (myTree.checkBoxCascadeOnCheck)
{
var parent:Object=myTree.getParentItem(data);
if(null!=parent)
toggleParents(parent,getState(myTree,parent));
}
}
//myTree.PropertyChange();
//dispatchEvent(new FlexEvent(FlexEvent.DATA_CHANGE));
}
/**
* 设置本项的复选框状态
* @param checkBox 复选框
* @param value
* @param state 状态
*
*/
private function setCheckState(checkBox:CheckBox,value:Object,state:int):void
{
if (state == STATE_CHECKED)
checkBox.selected=true;
else if (state == STATE_UNCHECKED)
checkBox.selected=false;
else if (state == STATE_SCHRODINGER)
checkBox.selected=false;
}
override public function set data(value:Object):void
{
if (value != null)
{
super.data=value;
setCheckState(myCheckBox,value,value[myTree.checkBoxStateField]);
}
}
override protected function updatedisplayList(unscaledWidth:Number,unscaledHeight:Number):void
{
super.updatedisplayList(unscaledWidth,unscaledHeight);
if (super.data)
{
if (super.icon != null)
{
myCheckBox.x=super.icon.x + myTree.checkBoxLeftGap;
myCheckBox.y=(height - myCheckBox.height) / 2;
super.icon.x=myCheckBox.x + myCheckBox.width + myTree.checkBoxRightGap;
super.label.x=super.icon.x + super.icon.width + 3;
}
else
{
myCheckBox.x=super.label.x + myTree.checkBoxLeftGap;
myCheckBox.y=(height - myCheckBox.height) / 2;
super.label.x=myCheckBox.x + myCheckBox.width + myTree.checkBoxRightGap;
}
setCheckState(myCheckBox,data,data[myTree.checkBoxStateField]);
if (myTree.checkBoxEnableState && data[myTree.checkBoxStateField] == STATE_SCHRODINGER)
{
fillCheckBox(true);
trace(myTree.checkBoxEnableState);
trace(data[myTree.checkBoxStateField]);
}
else
fillCheckBox(false);
}
}
protected function fillCheckBox(isFill:Boolean):void
{
myCheckBox.graphics.clear();
if (isFill)
{
var myRect:Rectangle=getCheckTreeBgRect(myTree.checkBoxBgPadding);
myCheckBox.graphics.beginFill(myTree.checkBoxBgColor,myTree.checkBoxBgalpha)
myCheckBox.graphics.drawRoundRect(myRect.x,myRect.y,myRect.width,myRect.height,myTree.checkBoxBgElips,myTree.checkBoxBgElips);
myCheckBox.graphics.endFill();
}
}
protected function getCheckTreeBgRect(checkTreeBgPadding:Number):Rectangle
{
var myRect:Rectangle=myCheckBox.getBounds(myCheckBox);
myRect.top+=checkTreeBgPadding;
myRect.left+=checkTreeBgPadding;
myRect.bottom-=checkTreeBgPadding;
myRect.right-=checkTreeBgPadding;
return myRect;
}
} //end class
} //end package
测试文档
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" fontSize="12" xmlns:controls="ht.*" creationComplete="initApp()" layout="horizontal"> <mx:Script> <!--[CDATA[ import mx.collections.*; import ht.*; import mx.collections.ArrayCollection; [Bindable] public var arrarc:ArrayCollection=new ArrayCollection([ {state:0,label:"有效值"},{state:0,label:"平均值"},label:"峰值"},label:"峰峰值"},label:"X1"},{state:2,label:"频带",children:[ {state:0,label:"频带1"},{state:1,label:"频带2"},label:"频带3"},label:"频带4"},label:"频带5"},] } ]); [Bindable] public var folderList:XMLList= <> <folder state="0" label="Marketing Collateral"> <folder state="0" label="Media,PR,and Communications" > <folder state="0" label="Article Reprint disclaimers" /> <folder state="0" label="Articles Reprints" /> <folder state="0" label="Interviews and Transcripts" /> <folder state="0" label="Press Kits" /> <folder state="0" label="Press Releases" /> <folder state="0" label="Quick Hits" /> <folder state="0" label="Rep Talking Points" /> <folder state="0" label="Special Updates" /> <folder state="0" label="White Papers" /> </folder> <folder state="0" label="Forms and Applications" > <folder state="0" label="Applications" /> <folder state="0" label="Forms" /> </folder> </folder> </> ; [Bindable] public var folderCollection:XMLListCollection; override protected function initializationComplete():void { super.initializationComplete(); folderCollection=new XMLListCollection(folderList); } protected function initApp():void { this.callLater(test); } protected function test():void { tree3.checkBoxOpenItemsOnCheck=true; tree3.checkBoxCascadeOnCheck=true; tree3.checkBoxEnableState=false; tree3.itemDClickSelect=true; tree2.checkBoxOpenItemsOnCheck=true; tree2.checkBoxCascadeOnCheck=true; tree2.checkBoxEnableState=true; tree2.checkBoxBgColor=0x000000; } ]]--> </mx:Script> <mx:Panel width="166" height="100%" layout="absolute"> <mx:Form x="0" y="0" width="146" height="100%"> <mx:CheckBox label="取消收回子项" id="checkBoxCloseItemsOnUnCheck" selected="true"/> <mx:CheckBox label="选中展开子项" id="checkBoxOpenItemsOnCheck"/> <mx:CheckBox label="是否三状态" id="checkBoxEnableState" selected="true"/> <mx:CheckBox label="是否关联父子" id="checkBoxCascadeOnCheck" selected="true"/> <mx:FormItem label="样式" direction="vertical"> <mx:ColorPicker id="checkBoxBgColor" selectedColor="#009900"/> <mx:HSlider width="61" id="checkBoxBgalpha" allowTrackClick="true" minimum="0" maximum="1" snapInterval="0.1" value="1"/> </mx:FormItem> <mx:FormItem label="填充边距"> <mx:NumericStepper id="checkBoxBgPadding" value="3" minimum="0" maximum="6" stepSize="1"/> </mx:FormItem> <mx:FormItem label="填充弧度"> <mx:NumericStepper id="checkBoxBgElips" value="2" minimum="0" maximum="6" stepSize="1"/> </mx:FormItem> <mx:FormItem label="左边距"> <mx:NumericStepper id="checkBoxLeftGap" value="8" minimum="0" maximum="20" stepSize="1"/> </mx:FormItem> <mx:FormItem label="右边距"> <mx:NumericStepper id="checkBoxRightGap" value="20" minimum="0" maximum="40" stepSize="1"/> </mx:FormItem> <mx:CheckBox label="双击是否展开项" id="itemDClickSelect" selected="true"/> </mx:Form> <mx:ControlBar height="46" y="321"> <mx:Togglebuttonbar> <mx:dataProvider> <mx:Array> <mx:String>Flash</mx:String> <mx:String>Director</mx:String> <mx:String>Dreamweaver</mx:String> <mx:String>ColdFusion</mx:String> </mx:Array> </mx:dataProvider></mx:Togglebuttonbar> </mx:ControlBar> </mx:Panel> <controls:CheckTree id="tree1" checkBoxStateField="@state" labelField="@label" dataProvider="{folderCollection}" width="100%" height="100%" checkBoxCloseItemsOnUnCheck="{checkBoxCloseItemsOnUnCheck.selected}" checkBoxOpenItemsOnCheck="{checkBoxOpenItemsOnCheck.selected}" checkBoxEnableState="{checkBoxEnableState.selected}" checkBoxCascadeOnCheck="{checkBoxCascadeOnCheck.selected}" checkBoxBgColor="{checkBoxBgColor.selectedColor}" checkBoxBgalpha="{checkBoxBgalpha.value}" checkBoxBgPadding="{checkBoxBgPadding.value}" checkBoxBgElips="{checkBoxBgElips.value}" checkBoxLeftGap="{checkBoxLeftGap.value}" checkBoxRightGap="{checkBoxRightGap.value}" itemDClickSelect="{itemDClickSelect.selected}" /> <controls:CheckTree id="tree2" width="100%" labelField="label" checkBoxStateField="state" dataProvider="{arrarc}" height="100%"/> <controls:CheckTree id="tree3" width="100%" labelField="label" checkBoxStateField="state" dataProvider="{arrarc}" height="100%"/> </mx:Application>
测试的效果图：
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