刷新每個項目的itemRenderer List組件的Flex

Question

我有如下列表：

<s:List id="list2" width="100%" height="100%" dataProvider="{ recordingsShown }" 
       itemRenderer="components.VideoItemRenderer2" 
       selectedIndex="0" visible="false"> 

      <s:layout> 

       <s:TileLayout id="tilelayout" 
           useVirtualLayout="true" 
           orientation="columns" 
           columnAlign="justifyUsingWidth" rowAlign="justifyUsingHeight" 
           requestedColumnCount="3" 
           requestedRowCount="2" 
           paddingBottom="5" paddingLeft="5" paddingRight="5" paddingTop="5" 
           verticalGap="10" horizontalGap="10" /> 

      </s:layout> 

</s:List> 

，顯示在瓷磚的名稱，日期和包含在的每部影片的預覽圖像arraycollection recordingsShown作爲dataprovider給出。 問題是，當添加一個新的視頻，我保存的文件夾中預覽PIC和節點描述它在XML和我提出一個新的項目在ArrayCollection中與

recordingsShown.addItemAt(newRecording,0); 

它在舞臺上添加，但沒有顯示最後添加的視頻的預覽圖像！ 我如何重新繪製整個列表才能顯示它？

這裏是我的itemRenderer：

<?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" 
      xmlns:mx="library://ns.adobe.com/flex/mx" 
      width="400" height="300" autoDrawBackground="true"> 

<fx:Metadata> 
    [Event(name="playClicked", type="flash.events.Event")] 
</fx:Metadata> 

<fx:Script> 
    <![CDATA[ 
     import flash.filters.GlowFilter; 

     import mx.controls.Alert; 
     import mx.events.FlexEvent; 
     import mx.formatters.DateFormatter; 




     protected function img_rollOverHandler(evt:MouseEvent):void { 
      Image(evt.currentTarget).filters = [new GlowFilter(0xf7941d)]; 
      Image(evt.currentTarget).alpha = 0.9; 
     } 

     protected function img1_rollOutHandler(evt:MouseEvent):void { 
      Image(evt.currentTarget).filters = []; 
      Image(evt.currentTarget).alpha = 1; 
     } 

     protected function playClickHandler(event:MouseEvent):void 
     { 

      dispatchEvent(new Event("playClicked",true,true)); 

     } 

    ]]> 
</fx:Script> 

<fx:Declarations> 
    <s:DateTimeFormatter id="dateTimeFormatter" 
         dateTimePattern="DD.MM.YYYY HH.NN.SS"/> 
</fx:Declarations> 

    <s:states> 
     <s:State name="normal" /> 
     <s:State name="hovered" /> 
     <s:State name="selected" /> 
    </s:states> 

    <s:Rect width="100%" height="100%" radiusX="5" radiusY="5"> 
     <s:filters> 
      <s:DropShadowFilter alpha="0.32" alpha.hovered="0.5" blurX="5" blurY="5" distance="2" /> 
     </s:filters> 
     <s:fill> 
      <s:LinearGradient rotation="90"> 
       <s:GradientEntry color="0x323232" color.selected="black"/> 
       <s:GradientEntry color="#7f7f7f" color.selected="0x333333"/>     
      </s:LinearGradient> 
     </s:fill> 
     <s:stroke> 
      <s:SolidColorStroke color="#ffffff" color.hovered="#f7941d" color.selected="#ed7f09" caps="none" weight="2" joints="miter" miterLimit="4"/> 
     </s:stroke> 
    </s:Rect> 

    <s:Label left="10" top="10" 
      fontStyle="italic" 
      fontWeight="bold" 
      color="#f7941d" 
      text="{dateTimeFormatter.format(data.date)}"/> 

    <s:Label left="10" top="25" 
      fontSize="16" 
      fontWeight="bold" 
      color="#ffffff" 
      text="{data.name}"/>  
    <s:Image id="previewImg" left="10" right="10" bottom="10" top="55" scaleMode="stretch" smooth="true" 
      source="http://localhost:5080/thumbs/{data.thumb}" /> 
      <!-- source="assets/img.jpg"/> -->    

    <s:Image source="assets/play.png" 
      rollOver="img_rollOverHandler(event);" 
      rollOut="img1_rollOutHandler(event);" 
      x="136" y="102" 
      click="playClickHandler(event)" 
      complete="this.invalidateSize()"/> 
</s:ItemRenderer> 

Answer 1

我發現，似乎有使用數據綁定問題，星火圖像。嘗試將此添加到根標記：

dataChange="yourImage.validateNow(); 

如果這樣不起作用，請在dataChange中設置整個路徑。