虚线分隔List项目(drawRowBackground应用一例)

override protected function drawRowBackground(s:Sprite,rowIndex:int,y:Number,height:Number,color:uint,dataIndex:int):void
{
  super.drawRowBackground(s,rowIndex,y,height,color,dataIndex);
  var bg:Shape = Shape(s.getChildAt(rowIndex));
  //此外为了显示虚线~使用一个while来循环来模拟虚线效果~
  var p:Number = 0;
  bg.graphics.lineStyle(1,0xCCCCCC);
  while(p < listContent.width)
  {
    bg.graphics.moveTo(p,height-1);
    bg.graphics.lineTo(p+4,height-1);
    p += 6;
  }
}