在Flex中給datagrid添加右鍵菜單項(xiàng)的具體實(shí)現(xiàn)

?xml version="1.0" encoding="utf-8"?>
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"
creationComplete="initApp()">
s:layout>
s:HorizontalLayout horizontalAlign="center" verticalAlign="middle"/>
/s:layout>
fx:Script>
![CDATA[
import mx.controls.Alert;
import mx.events.DataGridEvent;
import mx.events.FlexEvent;

import spark.events.GridEvent;
private var myContextMenu:ContextMenu;

private function initApp():void
{
popUpMenu();
}

private function popUpMenu():void
{
myContextMenu = new ContextMenu();
removeDefaultItems();
addCustomMenuItems();
//監(jiān)聽右鍵菜單彈出后的事件
myContextMenu.addEventListener(ContextMenuEvent.MENU_SELECT, menuSelectedHandler);
myDataGrid.contextMenu = myContextMenu;
}
//刪除原有菜單項(xiàng)
private function removeDefaultItems():void
{
myContextMenu.hideBuiltInItems();
var defaultItems:ContextMenuBuiltInItems = myContextMenu.builtInItems;
defaultItems.print = false;
}
//添加用戶自定義菜單項(xiàng)
private function addCustomMenuItems():void
{
var item:ContextMenuItem = new ContextMenuItem("刪除行");
//默認(rèn)的菜單項(xiàng)
item.visible = false;
myContextMenu.customItems.push(item);
//監(jiān)聽選擇菜單項(xiàng)后的事件
item.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT, itemSelectedHandler);
}
//彈出菜單后的事件處理函數(shù)
private function menuSelectedHandler(event:ContextMenuEvent):void
{
var item:ContextMenuItem = myContextMenu.customItems[0] as ContextMenuItem;

if (myDataGrid.selectedIndex >= 0)
{
item.visible = true;
}
else
{
item.visible = false;
}
}
//選擇菜單項(xiàng)后的事件處理函數(shù)
private function itemSelectedHandler(event:ContextMenuEvent):void
{

if (myDataGrid.selectedIndex >= 0)
{
myDataGrid.dataProvider.removeItemAt(myDataGrid.selectedIndex);
}
}

]]>
/fx:Script>
s:DataGrid requestedRowCount="4" id="myDataGrid"
width="500">
s:columns>
s:ArrayList>
s:GridColumn dataField="dataField1" headerText="列 1" id="col1">/s:GridColumn>
s:GridColumn dataField="dataField2" headerText="列 2">/s:GridColumn>
s:GridColumn dataField="dataField3" headerText="列 3">/s:GridColumn>
/s:ArrayList>
/s:columns>
s:typicalItem>
fx:Object dataField1="示例數(shù)據(jù)" dataField2="示例數(shù)據(jù)" dataField3="示例數(shù)據(jù)">/fx:Object>
/s:typicalItem>
s:ArrayList>
fx:Object dataField1="數(shù)據(jù)1" dataField2="數(shù)據(jù)1" dataField3="數(shù)據(jù)1">/fx:Object>
fx:Object dataField1="數(shù)據(jù)2" dataField2="數(shù)據(jù)2" dataField3="數(shù)據(jù)2">/fx:Object>
fx:Object dataField1="數(shù)據(jù)3" dataField2="數(shù)據(jù)3" dataField3="數(shù)據(jù)3">/fx:Object>
fx:Object dataField1="數(shù)據(jù)4" dataField2="數(shù)據(jù)4" dataField3="數(shù)據(jù)4">/fx:Object>
/s:ArrayList>
/s:DataGrid>

/s:Application>