flex-将滚动条的位置更改为水平列组件的顶部

我刚才在找类似的东西,发现 this post . 我最终以另一种方式解决了我的问题,所以没有使用那个解决方案,但是它可能适用于你想要的。

我以前也不得不做同样的事情。我不得不在基类中四处挖掘(以处理一些掩蔽/定位问题),这就是我想到的:

package
{
    import flash.display.DisplayObject;

    import mx.controls.HorizontalList;
    import mx.core.EdgeMetrics;

    public class ReverseHList extends HorizontalList
    {
        override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
        {
            super.updateDisplayList(unscaledWidth, unscaledHeight);

            var w:Number = unscaledWidth;
            var h:Number = unscaledHeight;
            var vm:EdgeMetrics = viewMetrics;
            if (horizontalScrollBar && horizontalScrollBar.visible)
            {
                horizontalScrollBar.setActualSize(w - vm.left - vm.right,
                                                  horizontalScrollBar.minHeight);
                horizontalScrollBar.move(vm.left, vm.top);

                horizontalScrollBar.enabled = enabled;
            }

            var mask:DisplayObject = maskShape;

            var wd:Number = w - vm.left - vm.right;
            var ht:Number = h - vm.top - vm.bottom;

            mask.width = wd < 0 ? 0 : wd;
            mask.height = ht < 0 ? 0 : ht;

            mask.x = vm.left;
            mask.y = vm.top + vm.bottom;
        }

        override protected function adjustListContent(unscaledWidth:Number = -1,
                                       unscaledHeight:Number = -1):void
        {
            super.adjustListContent(unscaledWidth, unscaledHeight);

            var lcx:Number = viewMetrics.left + listContent.leftOffset;
            var lcy:Number = (viewMetrics.top + listContent.topOffset) + viewMetrics.bottom;
            listContent.move(lcx, lcy);
        }

    }
}