flex datagrid 嵌checkbox实现全选与数据存储（非绑定数据源）

?http://fogiguiuu.iteye.com/blog/591106

?

重写了DataGrid，主要是为了得到DataGrid的listItems属性，listItems保存了当前现显示的每一行的信息，还用了个ArrayCollection保存被选中了行的信息。

MyDataGrid.as

package flex.components.checkdatagrid
{
	import mx.collections.ArrayCollection;
	import mx.controls.Alert;
	import mx.controls.DataGrid;
	
	public class MyDataGrid extends DataGrid
	{
		protected var arrColl:ArrayCollection = null; ?//保存被选中的信息
		
		public function MyDataGrid()
		{
			super();
			arrColl = new ArrayCollection();
		}
		
                //方法名不该取这个的
		public function get listRendererArray():Array{  
			return listItems;
		}
		
		//add
		public function addToSelected(item:Object):void{
			
			if(arrColl.getItemIndex(item)<0)
			{
				arrColl.addItem(item);
			}
		}
		
		//del
		public function delFromSelected(item:Object):void{
			
			if(arrColl.getItemIndex(item)>-1)
			{
				arrColl.removeItemAt(arrColl.getItemIndex(item));
			}
		}
		
		//isIn
		public function isInSelected(item:Object):Boolean{
			
			if(arrColl.getItemIndex(item)<0)
			{
				return false;
			}
			else
			{
				return true;
			}
		}
		
		public function getSelected():ArrayCollection{
			return arrColl;
		}
	}
}

CheckHeadBoxIR.as? 实现全选用的checkbox

package flex.components.checkdatagrid
{
	import flash.display.DisplayObject;
	import flash.events.Event;
	import flash.text.TextField;
	
	import mx.controls.CheckBox;
	import mx.controls.DataGrid;
	import mx.events.DataGridEvent;

	public class CheckHeadBoxIR extends CheckBox
	{
		public function CheckHeadBoxIR(){
			super();
			this.addEventListener(Event.CHANGE,cgHandler);
		}
		
		override public function set data(value:Object) : void{
			//super.data = value; ? ?//一定不要有这句
			this.selected = false;
			DataGrid(listData.owner).addEventListener(DataGridEvent.HEADER_RELEASE,sortEventHandler);
		}
		
		private function sortEventHandler(event:DataGridEvent):void{
			
			if(event.itemRenderer == this)
			{
				event.preventDefault();
			}
		}
		
		//居中显示
		override protected function updateDisplayList(w:Number,h:Number) : void{
			super.updateDisplayList(w,h);
			
			for(var i:Number=0; i<numChildren; i++)
			{
				var c:DisplayObject = getChildAt(i);
				if(!(c is TextField))
				{
					c.x = Math.round((w-c.width)/2);
					c.y = Math.round((h-c.height)/2);
				}
			}
		}
		
		protected function cgHandler(event:Event):void{
			
			//得到DataGrid里的listItems
			var listItems:Array =  MyDataGrid(listData.owner).listRendererArray;
			
			if(listItems.length>0)
			{
				for(var i:Number=0; i<listItems.length; i++)
				{
					if(listItems[i].length>0)
					{
						if(listItems[i][0].selected != this.selected)
						{
							listItems[i][0].selected = this.selected;
							listItems[i][0].dispatchEvent(new Event(Event.CHANGE));
						}
					}
				}
			}
			/*var ii:Object = dataGrid.indexToItemRenderer(2).data;*/
		}
	}
}

CheckBoxIR.as

package flex.components.checkdatagrid
{
	
	import flash.display.DisplayObject;
	import flash.events.Event;
	import flash.text.TextField;
	
	import mx.collections.ArrayCollection;
	import mx.controls.Alert;
	import mx.controls.CheckBox;
	
	public class CheckBoxIR extends CheckBox{
		
		public function CheckBoxIR(){
			super();
			this.addEventListener(Event.CHANGE,cgHandler);
		}
		
		override public function set data(value:Object) : void{
			super.data = value;

			
			if(MyDataGrid(listData.owner).isInSelected(data.id))
			{
				this.selected = true;
			}
			else
			{
				this.selected = false;
			}
			
		//	Alert.show("int set data--"+data.@id);
		}
		
		
		//居中显示
		override protected function updateDisplayList(w:Number,h);
			
			for(var i:Number=0; i<numChildren; i++)
			{
				var c:DisplayObject = getChildAt(i);
				if(!(c is TextField))
				{
					c.x = Math.round((w-c.width)/2);
					c.y = Math.round((h-c.height)/2);
				}
			}
		}
		
		protected function cgHandler(event:Event):void{
	
			var dg:MyDataGrid = MyDataGrid(listData.owner);
			
			if(this.selected == true)
			{
				dg.addToSelected(data.id);
			}
			else
			{
				dg.delFromSelected(data.id);
			}
		}

	}
}

?

应用

<checkdatagrid:MyDataGrid width="100%" borderStyle="outset" height="366" 
								   id="orderInfo" dataProvider="{data}" >
			<checkdatagrid:columns>
				<mx:DataGridColumn headerRenderer=flex.components.checkdatagrid.CheckHeadBoxIR" itemRenderer="flex.components.checkdatagrid.CheckBoxIR" width="30"/>
			</checkdatagrid:columns>
		</checkdatagrid:MyDataGrid>