实现AdvancedDataGrid全选功能

AdvancedDataGrid功能强大，非常好用。遗憾的是AdvancedDataGrid对全选的支持不是很好。以下代码实现了AdvancedDataGrid的全选功能：
1. 左上角加了一个checkBox
2. 每行加了checkBox
3. 不符合条件的不能选
4. 点击全选，选中所有符合条件的记录

实现效果如下图：



实现代码如下：

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="init()">
<!--
Author: myShareBook.cn
Date: 2009-06-29
-->
<mx:Script>
<!--[CDATA[
import mx.controls.Alert;
import mx.collections.ArrayCollection;

private var selectedColl:ArrayCollection = new ArrayCollection();

private function init():void{
this.myADG.expandAll();  		// 扩展控件中导航树的所有节点
}

// 全选，取消功能
private function selectAllCbxClick(event:Event):void{
if(selectAllCbx.selected){  // 如果全选被选中
this.selectedColl = dpFlat;  // 1.选中
this.gc.refresh();
this.myADG.expandAll();  	// 扩展控件中导航树的所有节点
}else{
this.selectedColl = new ArrayCollection();  // 1. 设置为取消
this.gc.refresh();
this.myADG.expandAll();  	// 扩展控件中导航树的所有节点
}
}

// 判断某个节点是否被选中
public function hasSelected(data:Object):Boolean{
var hasSelected:Boolean = false;
for each(var obj:Object in selectedColl){
if(data.Actual == obj.Actual && data.Estimate == obj.Estimate){
hasSelected = true;
break;
}
}
return hasSelected;
}

[Bindable]
private var dpFlat:ArrayCollection = new ArrayCollection([
{Region:"Southwest", Territory:"Arizona",
Territory_Rep:"Barbara Jennings", Actual:38865, Estimate:40000},
{Region:"Southwest", Territory:"Arizona",
Territory_Rep:"Dana Binn", Actual:29885, Estimate:30000},
{Region:"Southwest", Territory:"Central California",
Territory_Rep:"Joe Smith", Actual:29134, Estimate:30000},
{Region:"Southwest", Territory:"Nevada",
Territory_Rep:"Bethany Pittman", Actual:52888, Estimate:45000},
{Region:"Southwest", Territory:"Northern California",
Territory_Rep:"Lauren Ipsum", Actual:38805, Estimate:40000},
{Region:"Southwest", Territory:"Northern California",
Territory_Rep:"T.R. Smith", Actual:55498, Estimate:40000},
{Region:"Southwest", Territory:"Southern California",
Territory_Rep:"Alice Treu", Actual:44985, Estimate:45000},
{Region:"Southwest", Territory:"Southern California",
Territory_Rep:"Jane Grove", Actual:44913, Estimate:45000}
]);

]]-->
</mx:Script>

<mx:Panel title="AdvancedDataGrid Control Example"
height="75%" width="75%" layout="horizontal"
paddingTop="10" paddingBottom="10" paddingLeft="10" paddingRight="10">
<mx:Canvas width="100%" height="100%">
<mx:AdvancedDataGrid id="myADG"
width="100%" height="100%"
initialize="gc.refresh();">
<mx:dataProvider>
<mx:GroupingCollection id="gc" source="{dpFlat}">
<mx:grouping>
<mx:Grouping>
<mx:GroupingField name="Region"/>
<mx:GroupingField name="Territory"/>
</mx:Grouping>
</mx:grouping>
</mx:GroupingCollection>
</mx:dataProvider>

<mx:columns>
<mx:AdvancedDataGridColumn>
<mx:itemRenderer>
<mx:Component>
<mx:HBox width="100%" horizontalAlign="center">
<mx:CheckBox selected="{data.Actual > 40000 && outerDocument.hasSelected(data)}" enabled="{data.Actual > 40000}" />
<mx:Text text="{data.Region}"/>
</mx:HBox>
</mx:Component>
</mx:itemRenderer>
</mx:AdvancedDataGridColumn>

<mx:AdvancedDataGridColumn dataField="Territory"/>
<mx:AdvancedDataGridColumn dataField="Territory_Rep" headerText="Territory Rep"/>
<mx:AdvancedDataGridColumn dataField="Actual"/>
<mx:AdvancedDataGridColumn dataField="Estimate"/>
</mx:columns>

</mx:AdvancedDataGrid>

<!-- 全选按钮 -->
<mx:CheckBox id="selectAllCbx" toolTip="Select All" click="selectAllCbxClick(event)"/>

</mx:Canvas>
</mx:Panel>

</mx:Application>