Flex List组件实例与删除、添加操作

<?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">
  <fx:Script>
     <![CDATA[
            import mx.effects.DefaultListEffect;
            import mx.collections.ArrayCollection;
 
            [Bindable]
            private var myDP:ArrayCollection= new ArrayCollection(
                 ['A','B','C','D','E','F','G','H']);

            private function deleteItem():void {
                // As each item is removed, the index of the other items changes.
                // So first get the items to delete, then determine their indices
                // as you remove them.
                var toRemove:Array = [];
                for (var i:int = 0; i < list0.selectedItems.length; i++)
                    toRemove.push(list0.selectedItems[i]);
                for (i = 0; i < toRemove.length; i++)
                    myDP.removeItemAt(myDP.getItemIndex(toRemove[i]));
            }

            private var zcount:int = 0;
            private function addItem():void {
                // Always add the new item after the third item,
                // or after the last item if the length is less than 3.
                myDP.addItemAt("Z"+zcount++,Math.min(3,myDP.length));
            }