Flex DataGrid CheckBox selectAll 全选实现

http://hi.baidu.com/qiyangyang2009/blog/item/e52825dc14be10fd76c63885.html/cmtid/fc9f115984c8278e800a18c1

引用

一，首先创建一个类继承自DataGridColumn用来用成员保存全选状态；

package com.sintrue.components.datagridcheckbox
{
 import mx.controls.dataGridClasses.DataGridColumn;
 public class CheckBoxHeaderColumn extends DataGridColumn
 {
  public function CheckBoxHeaderColumn(columnName:String=null)
  {
   super(columnName);
  }
  /**is the checkbox in header selected**/
  public var selected:Boolean = false;

 }
}

二，创建HeaderRenderer类，继承自CheckBox

package com.sintrue.components.datagridcheckbox
{

 import flash.events.Event;
 import flash.events.MouseEvent;

 import mx.controls.CheckBox;
 import mx.controls.DataGrid;
 import mx.events.DataGridEvent;
 public class CheckBoxHeaderRenderer extends CheckBox
 {

  public function CheckBoxHeaderRenderer()
  {
   super();
   //addEventListener("click", clickHandler);
  }
  private var _data:CheckBoxHeaderColumn;
  override public function get data():Object
  {
   return _data;
  }

  override public function set data(value:Object):void
  {
   _data = value as CheckBoxHeaderColumn;
   DataGrid(listData.owner).addEventListener(DataGridEvent.HEADER_RELEASE, sortEventHandler);
   selected = _data.selected;
  }

  private function sortEventHandler(event:DataGridEvent):void
  {
   if (event.itemRenderer == this)
    event.preventDefault();
  }

  override protected function clickHandler(event:MouseEvent):void
  {
   super.clickHandler(event);
   data.selected = selected;
   var dg:DataGrid = DataGrid(listData.owner);//get DataGrid object
   if(dg.dataProvider.length>0){
            for(var i:int = 0; i < dg.dataProvider.length ; i++){
             dg.dataProvider[i].@selected = this.selected;
         }
           }
           dg.dataProvider.refresh();
  }

 }
} 

三 创建DataRenderer，继承自CheckBox

package com.sintrue.components.datagridcheckbox
{
 import flash.events.Event;

 import mx.controls.CheckBox;

 public class CheckBoxItemDataRenderer extends CheckBox
 {
  public function CheckBoxItemDataRenderer()
  {
   super();

   this.addEventListener(Event.CHANGE, changeHandler);
  }

  override public function set data(value:Object):void
  {
   super.data = value;
   this.selected = listData.label == 'true';
  }

  protected function changeHandler(event : Event) : void
  {
   if(data is XML)
   data.@selected = this.selected;
   else
   data.selected = this.selected;
  }

 }
}

四，使用

<dataGrid:CheckBoxHeaderColumn textAlign="center"
            dataField="@selected" width="26"
            itemRenderer="com.sintrue.components.datagridcheckbox.CheckBoxItemDataRenderer"
            headerRenderer="com.sintrue.components.datagridcheckbox"/>

http://cookbooks.adobe.com/post_Select_all_checkboxes_in_a_datagrid-10786.html
http://www.justskins.com/forums/select-all-checkboxes-in-85899.html

http://www.fengfly.com/plus/view-172194-1.html



这个最简单好用.....哈哈
spark的checkbox没有data这个属性...mx的checkbox有data这个属性....

Select all checkboxes in datagrid via code

 
Im doing this:

private function selectAll():void {
var length : int = myDataGrid.dataProvider.length;
for( var i : int = 0; i < length; i++ )
{
var item : Object = myAccounts.getItemAt( i );
item["Include"] = '1';
}
myAccounts.refresh();
}

Include is my column of checkboxs in my datagrid

<mx:DataGridColumn headerText="Include" dataField="Include" width="58"
sortable="false">

<mx:itemRenderer>
<mx:Component>
<mx:HBox horizontalAlign="center">
<mx:CheckBox click="data.Include=!data.Include"
selected="{data.Include}" themeColor="#73B9B9"/>
</mx:HBox>
</mx:Component>
</mx:itemRenderer>

</mx:DataGridColumn>