解决此问题的一种方法是向dataProvider中的对象添加一个字段,用于跟踪是否已选择该项目。
然后,在您的项目渲染器中,检查此字段并决定是否显示复选标记。这里有一个工作示例应用程序和渲染器:
应用:
<?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" minWidth="955" minHeight="600" xmlns:local="*"
creationComplete="application1_creationCompleteHandler(event)">
<fx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
import mx.events.CollectionEvent;
import mx.events.CollectionEventKind;
import mx.events.FlexEvent;
import mx.events.PropertyChangeEvent;
import mx.events.PropertyChangeEventKind;
private var collection:ArrayCollection;
protected function application1_creationCompleteHandler(event:FlexEvent):void
{
collection = new ArrayCollection([
{ label: 1, selected: false },
{ label: 2, selected: false },
{ label: 3, selected: false }]);
listbert.dataProvider=collection;
}
protected function listbert_clickHandler(event:MouseEvent):void
{
var index:int = listbert.selectedIndex;
var item:Object = listbert.selectedItem;
item.selected = !item.selected;
// Create these events because the items in the ArrayCollection
// are generic objects. It shouldn't be necessary if items in
// your collection are a Class that extends EventDispatcher
// see ArrayList::startTrackUpdates()
var e:PropertyChangeEvent = new PropertyChangeEvent(
PropertyChangeEvent.PROPERTY_CHANGE, false,false,
PropertyChangeEventKind.UPDATE, 'selected', !item.selected,
item.selected, item);
collection.dispatchEvent(new CollectionEvent(
CollectionEvent.COLLECTION_CHANGE, false,false,
CollectionEventKind.UPDATE, index, index, [e]));
}
]]>
</fx:Script>
<s:List id="listbert" click="listbert_clickHandler(event)" itemRenderer="TestRenderer"/>
</s:Application>
项渲染:
<?xml version="1.0" encoding="utf-8"?>
<s:ItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark" >
<fx:Script>
<![CDATA[
override public function set data(value:Object):void
{
super.data = value;
labelDisplay.text = value.label;
if (value.selected)
checkMarkLabel.text = "✓";
else
checkMarkLabel.text = "";
}
]]>
</fx:Script>
<s:layout>
<s:HorizontalLayout/>
</s:layout>
<s:Label id="labelDisplay" />
<s:Label id="checkMarkLabel" />
</s:ItemRenderer>
你只需要调用使用Flex可怜的工作?在寻求帮助时,这可能不是构建问题的正确方法吗? – JeffryHouser 2013-02-25 23:47:29
那么,社区太小了,我找不到更好的词。这不是我讨厌它,而是我知道他们讨厌它的人。 – Bytekoder 2013-02-25 23:52:48
在我的世界版本中;一个小社区并不等同于一种可怜的技术。我很抱歉你认识的每个人都讨厌Flex。 Apache Flex团队正在用Flex做一些非常酷的事情,包括围绕“HTML5”输出的一些很棒的实验。如果你需要Flex的帮助,我建议你不要开始“抨击”那些与之合作的人。 – JeffryHouser 2013-02-26 01:50:14