15.項(xiàng)呈現(xiàn)器創(chuàng)建方法：

    1）內(nèi)投方法：通過(guò)在列表控件的itemRenderer屬性中定義單個(gè)組件，能夠?qū)⒉迦氲膯蝹€(gè)組件作為項(xiàng)呈現(xiàn)器

    2）內(nèi)聯(lián)方法：使用列表控件的子標(biāo)簽來(lái)定義一個(gè)或多個(gè)組件，這些組件將作為項(xiàng)呈現(xiàn)器

    3）可重用組件：將自定義組件作為項(xiàng)呈現(xiàn)器

內(nèi)投方法示例：

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">

 <mx:Script>

 <![CDATA[

   [Bindable]

   privatevar myDP:Array = [

    {label: "Customer 1", selected: true},

    {label: "Customer 2", selected: false}

   ];

 ]]>

 </mx:Script>

 <mx:DataGrid dataProvider="{myDP}">

 <mx:columns>

   <mx:DataGridColumn dataField="label" headerText="Label" />

   <mx:DataGridColumn dataField="selected" itemRenderer="mx.controls.CheckBox" />

 </mx:columns>

 </mx:DataGrid>

</mx:Application>

內(nèi)聯(lián)方法示例：

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">

 <mx:Script>

 <![CDATA[

   [Bindable]

   privatevar myDP:Array = [

    {label: "Customer 1", selected: true},

    {label: "Customer 2", selected: false}

   ];

 ]]>

 </mx:Script>

 <mx:DataGrid dataProvider="{myDP}">

 <mx:columns>

   <mx:DataGridColumn dataField="label" headerText="Label" />

   <mx:DataGridColumn dataField="selected">

    <mx:itemRenderer>

     <mx:Component>

      <mx:VBox verticalAlign="middle" horizontalAlign="center">

       <mx:CheckBox/>

      </mx:VBox>

     </mx:Component>

    </mx:itemRenderer>

   </mx:DataGridColumn>

 </mx:columns>

 </mx:DataGrid>

</mx:Application>

將組件作為呈現(xiàn)器示例：

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">

 <mx:Script>

 <![CDATA[

   [Bindable]

   privatevar myDP:Array = [

    {label: "Oranges", date: new Date()},

    {label: "Apples", date: new Date()},

    {label: "Pears", date: new Date()}

   ];

 ]]>

 </mx:Script>

 <mx:List dataProvider="{myDP}" itemRenderer="MyCustomItemRenderer" />

</mx:Application>

MyCustomItemRenderer.xml

<mx:HBox xmlns:mx="http://www.adobe.com/2006/mxml">

 <mx:Script>

 <![CDATA[

   import mx.controls.Alert;

 ]]>

 </mx:Script>

 <mx:HBox>

 <mx:TextInput text="{data.label}" />

 <mx:DateField id="dateField" selectedDate="{data.date}" />

 <mx:Button label="Button" click="Alert.show('Selected item - Fruit: ' + data.label + '"n' + 'Date: ' + dateField.selectedDate)" />

 </mx:HBox>

</mx:HBox>
16.項(xiàng)編輯器
編輯過(guò)程：
a) 用戶利用鼠標(biāo)按鈕或者tab鍵激活單元格
b) 分派itemEditBeginning 事件，使用該事件能夠禁用某特定單元格或者多個(gè)單元格的編輯功能
c) 分派itemEditBegin事件以便打開(kāi)項(xiàng)編輯器，該事件可用于修改傳遞給項(xiàng)編輯器數(shù)據(jù)
d)用戶編輯單元格數(shù)據(jù)
e)用戶移除焦點(diǎn)時(shí)，結(jié)束編輯會(huì)話
f)分派itemEditEnd 事件以便關(guān)閉項(xiàng)編輯器，同時(shí)使用新數(shù)據(jù)更新單元格

當(dāng)列表控件(List Tree DataGrid)的editable屬性設(shè)置為true時(shí)，用戶就能夠編輯控件內(nèi)容

自定義編輯事件監(jiān)聽(tīng)器訪問(wèn)單元格數(shù)據(jù)：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">

 <mx:Script>
  <![CDATA[
   import mx.controls.TextInput;
   import mx.events.DataGridEvent;
   import mx.collections.ArrayCollection;
   
   [Bindable]
   private var productsAC:ArrayCollection = new ArrayCollection
   (
    [
     {Product: "iPod", Price: 249},
     {Product: "iMac", Price: 1299},
     {Product: "MacBook Pro", Price: 1999}
    ]
   );
   
   private function getCellInfo(event:DataGridEvent):void
   {
    var myEditor:TextInput = TextInput(event.currentTarget.itemEditorInstance);
    var newVal:String = myEditor.text;
    var oldVal:String = event.currentTarget.editedItemRenderer.data[event.dataField];
    cellInfo.text = "cell edited. \n";
    cellInfo.text += "Row, column: " + event.rowIndex + ", " + event.columnIndex + "\n";
    cellInfo.text += "New value: " + newVal + "\n";
    cellInfo.text += "Old value: " + oldVal;
   }
   
  ]]>
 </mx:Script>
 
 <mx:TextArea id="cellInfo" width="300" height="150" />
 
 <mx:DataGrid dataProvider="{productsAC}" editable="true" itemEditEnd="getCellInfo(event)">
  <mx:columns>
   <mx:DataGridColumn dataField="Product" />
   <mx:DataGridColumn dataField="Price" />
  </mx:columns>
 </mx:DataGrid>
 
</mx:Application>
禁用單元格編輯器：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">

 <mx:Script>
  <![CDATA[
   import mx.controls.TextInput;
   import mx.events.DataGridEvent;
   import mx.collections.ArrayCollection;
   
   [Bindable]
   private var productsAC:ArrayCollection = new ArrayCollection
   (
    [
     {Product: "iPod", Price: 249},
     {Product: "iMac", Price: 1299},
     {Product: "MacBook Pro", Price: 1999}
    ]
   );
   
   private function onEditBeginning(event:DataGridEvent):void
   {
    if (event.rowIndex == 2)
     event.preventDefault();
   }
   
  ]]>
 </mx:Script>
 
 <mx:DataGrid dataProvider="{productsAC}" editable="true" itemEditBeginning="onEditBeginning(event)">
  <mx:columns>
   <mx:DataGridColumn dataField="Product" />
   <mx:DataGridColumn dataField="Price" />
  </mx:columns>
 </mx:DataGrid>
 
</mx:Application>