[Flex] 组件Tree系列 —— 支持CheckBox组件

主程序mxml：

<?xml version="1.0" encoding="utf-8"?>

<!--功能描述：支持CheckBox-->

<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>
        
        
    </fx:Declarations>
    <fx:Style>
        @namespace s "library://ns.adobe.com/flex/spark";
        @namespace mx "library://ns.adobe.com/flex/mx";
        mx|Tree{
            /*去掉默认文件夹图标*/
            folderClosedIcon: ClassReference(null);
            folderOpenIcon: ClassReference(null);
            
            /*去掉叶子节点图标*/
            defaultLeafIcon: ClassReference(null);
            
            /*
            defaultLeafIcon    指定叶图标
            disclosureClosedIcon    指定的图标旁边显示一个封闭的分支节点。默认的图标是一个黑色三角形。
            disclosureOpenIcon    指定的图标旁边显示一个开放的分支节点。默认的图标是一个黑色三角形。
            folderClosedIcon    关闭指定的文件夹图标的一个分支节点。
            folderOpenIcon    指定打开的文件夹图标的一个分支节点。
            例：三角图标修改如下代码使用即可换成自己的了：
            disclosureOpenIcon:Embed(source='images/a.png');
            disclosureClosedIcon:Embed(source='images/b.png');
            */
        }
        
    </fx:Style>
    
    <fx:Script>
        <![CDATA[
            import com.render.TreeRightClickManager;
            
            import mx.controls.Alert;
            private var rightClickRegisted:Boolean;
                
            [Bindable]
            private var data:XML=
                <data>
                    <actor label="周星驰" level="0" selected="false">
                        <year label="1988" level="1" selected="false">
                            <item label="《霹雳先锋》香港票房8916612 " level="2" selected="false"/>
                            <item label="《捕风汉子》香港票房3149395 " level="2" selected="false"/>
                            <item label="《最佳女婿》香港票房5807710 " level="2" selected="false"/>
                        </year>
                        <year label="1989" level="1" selected="false">
                            <item label="《龙在天涯》香港票房6809853 " level="2" selected="false"/>
                            <item label="《义胆群英》香港票房7913329 " level="2" selected="false"/>
                            <item label="《流氓差婆》香港票房5624622 " level="2" selected="false"/>
                            <item label="《风雨同路》香港票房9335299 " level="2" selected="false"/>
                        </year>
                        <year label="1990" level="1" selected="false">
                            <item label="《望夫成龙》香港票房13703364 " level="2" selected="false"/>
                            <item label="《咖喱辣椒》香港票房15777856 " level="2" selected="false"/>
                            <item label="《小偷阿星》香港票房7968106 " level="2" selected="false"/>
                            <item label="《师兄撞鬼》香港票房12128944 " level="2" selected="false"/>
                            <item label="《赌圣》香港票房41326156 "  level="2" selected="false"/>
                            <item label="《无敌幸运星》香港票房18799869" level="2" selected="false"/>
                            <item label="《江湖最后一个大佬》香港票房5495811 " level="2" selected="false"/>
                        </year>
                    </actor>
                        
                    <actor label="李连杰" level="0" selected="false">
                        <year label="1992" level="1" selected="false">
                            <item label="笑傲江湖之东方不败（1992）" level="2" selected="false"/>
                            <item label="黄飞鸿之二男儿当自强（1992） " level="2" selected="false"/>
                            <item label="黄飞鸿之三狮王争霸（1992） " level="2" selected="false"/>
                        </year>
                        <year label="1993" level="1" selected="false">
                            <item label="方世玉Ⅱ万夫莫敌（1993） " level="2" selected="false"/>
                            <item label="倚天屠龙记之魔教教主（1993）" level="2" selected="false"/>
                            <item label="黄飞鸿之铁鸡斗蜈蚣（1993）" level="2" selected="false"/>
                            <item label="太极张三丰（1993）" level="2" selected="false"/>
                        </year>
                        <year label="1994" level="1" selected="false">
                            <item label="新少林五祖（1994）" level="2" selected="false"/>
                            <item label="精武英雄（1994）" level="2" selected="false"/>
                            <item label="中南海保镖（1994）" level="2" selected="false"/>
                            <item label="给爸爸的信（1995)" level="2" selected="false"/>
                        </year>
                            <year label="1995" level="1" selected="false">
                            <item label="鼠胆龙威（1995）" level="2" selected="false"/>
                            <item label="给爸爸的信（1995)" level="2" selected="false"/>
                        </year>
                    </actor>
                </data>
                ;
            private function treeChangeHandle(event:Event):void{
                var selectedTreeNode:XML;
                selectedTreeNode=Tree(event.target).selectedItem as XML;
            }
                        
            private function getSelectedChild(xml:XML):String{
                var result:String="";
                for(var i:int=0;i<xml.children().length();i++){
                    if((xml.children()[i].@selected=="true") && (xml.children()[i].@level=="2")){
                        result+=xml.children()[i].@label+"
";
                    }
                    var temp:XML=new XML(xml.children()[i].toString());
                    if(temp.children().length()>0){
                        result+=getSelectedChild(temp);
                    }
                }
                return result;
            }
            
            protected function add_clickHandler(event:MouseEvent):void
            {
                txtAr.text=getSelectedChild(data);
            }
            
        ]]>
    </fx:Script>
    
    <s:Panel width="300" height="400" title="所有影片">
        <mx:Tree id="tree" top="0" left="0" width="100%" height="100%" labelField="@label" showRoot="false"
                 itemRenderer="com.render.TreeCheckBoxRenderer" dataProvider="{data}" 
                 change="treeChangeHandle(event)" styleName="Tree">
        </mx:Tree>
    </s:Panel>
    <s:Panel x="310" width="300" height="400" title="选中的影片">
        <s:TextArea id="txtAr" top="0" left="0" width="100%" height="100%"/>
    </s:Panel>
    <s:Button y="410" label="添加选中" click="add_clickHandler(event)"/>
</s:Application>

com.render.TreeCheckBoxRenderer类：

package com.render
{
    import flash.events.Event;
    import flash.events.MouseEvent;
    
    import mx.controls.Alert;
    import mx.controls.CheckBox;
    import mx.controls.Tree;
    import mx.controls.treeClasses.TreeItemRenderer;
    import mx.controls.treeClasses.TreeListData;
    
    import spark.components.Button;
    
    /**
     * 支持CheckBox的TreeItemRenderer 
     * @author 
     * 
     */       
    public class TreeCheckBoxRenderer extends TreeItemRenderer
    {
        public function TreeCheckBoxRenderer()
        {
            super();
        }
        
        /**
         * 表示CheckBox控件从data中所取数据的字段
         */        
        
        protected var checkBox:CheckBox;
        protected var button:Button;
        
        /**
         * 构建CheckBox
         */        
        override protected function createChildren():void
        {
            super.createChildren();
            checkBox = new CheckBox();
            addChild( checkBox );
            checkBox.addEventListener(Event.CHANGE, changeHandler);
        }
        
        /**
         * 点击checkbox时,更新dataProvider
         * @param event
         */        
        protected function changeHandler( event:Event ):void
        {
            if( data.@selected!="" ){
                data.@selected= checkBox.selected.toString();
                for (var i:int=0;i<data.children().length();i++){
                    data.children()[i].@selected=checkBox.selected.toString();;
                }     
            }    
        } 
        
        
        /**
         * 初始化控件时, 给checkbox赋值
         */        
        override protected function commitProperties():void
        {
            super.commitProperties();
            if(data.@selected!="" ){
                //trace(data,"data");
                if(data.@selected=="true"){
                    checkBox.selected=true;
                }else{
                    checkBox.selected=false;
                }
            }
            else{
                checkBox.selected = false;
            }
        }
        
        /**
         * 重置itemRenderer的宽度
         */        
        override protected function measure():void
        {
            super.measure();
            measuredWidth += checkBox.getExplicitOrMeasuredWidth();
        }
        
        /**
         * 重新排列位置, 将label后移
         * @param unscaledWidth
         * @param unscaledHeight
         */        
        override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
        {
            super.updateDisplayList(unscaledWidth, unscaledHeight);
            var startx:Number = data ? TreeListData( listData ).indent : 0;
            if (disclosureIcon){
                disclosureIcon.x = startx;
                startx = disclosureIcon.x + disclosureIcon.width;
                disclosureIcon.setActualSize(disclosureIcon.width,disclosureIcon.height);
                disclosureIcon.visible = data ?TreeListData( listData ).hasChildren :false;
            }
            
            if (icon){
                icon.x = startx;
                startx = icon.x + icon.measuredWidth;
                icon.setActualSize(icon.measuredWidth, icon.measuredHeight);
            }
            checkBox.move(startx, ( unscaledHeight - checkBox.height ) / 2 );
            label.x = startx + checkBox.getExplicitOrMeasuredWidth();
        }
    }
}