不设定这个值，卷轴不会出现，即使清单方块中的项目比方块宽。
Without this value set, the scroll bar will not appear, even when the items in the list box are wider than the box.
王剑：神剑是一个横向卷轴动作MMORPG中亚瑟王的境界和圆桌骑士设定。
Sword of King: Excalibur is a side-scrolling action MMORPG set in the realm of King Arthur and the Knights of the Round Table.
然后，控制项可设定内部状态，以在UI中为该控制项设定卷轴。
The control could then set an internal state that enabled scrollbars in the UI for that control.
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