将扩展滚动条添加到 Flex 中的扩展火花列表

Add extended Scroller to extended spark List in Flex

我正在尝试将自定义 Scroller.as(从 spark.components.Scroller 扩展)添加到 InfiniteScrollList.as(从 spark.components.list 扩展)

我写了下面的 MXML 代码:

<list:InfiniteScrollList width="100%" height="100%" id="EventsList" useVirtualLayout="true">
    <list:scroller>
         <list:Scroller/> <!-- The Scroller.as Class -->
    </list:scroller>
</list:InfiniteScrollList>

List 行为正常,但扩展的 Scroller 组件根本不起作用。
将此滚动条功能(在 MXML 或 ActionScript 中)添加到列表的正确方法是什么?

s:Scroller 用于将内容或数据组包裹起来。但是 List class 将所有功能都包装在它的皮肤中,所以我相信为了为 List 创建自定义 Scroller,您实际上需要在 SkinClass 中进行操作。

<list:InfiniteScrollList  width="100%" height="100%"  id="EventsList"
      useVirtualLayout="true" skinClass="MyListSkin" />

MyListSkin.mxml:

<s:SparkSkin xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark"
  xmlns:fb="http://ns.adobe.com/flashbuilder/2009" minWidth="112"> 

<fx:Metadata>
    [HostComponent("spark.components.Scroller")]
</fx:Metadata> 

<s:states>
    <s:State name="normal" />
    <s:State name="disabled" />
</s:states>


    <!-- The Scroller.as Class -->
    <list:Scroller left="0" top="0" right="0" bottom="0" id="scroller" hasFocusableChildren="false">
        <!--- @copy spark.components.SkinnableDataContainer#dataGroup -->
        <s:DataGroup id="dataGroup" itemRenderer="spark.skins.spark.DefaultItemRenderer">
            <s:layout>
                <!--- The default layout is vertical and measures at least for 5 rows.  
                When switching to a different layout, HorizontalLayout for example,
                make sure to adjust the minWidth, minHeight sizes of the skin -->
                <s:VerticalLayout gap="0" horizontalAlign="contentJustify" requestedMinRowCount="5" />
            </s:layout>
        </s:DataGroup>
    </list:Scroller/>
</s:SparkSkin>