当焦点在左滑块上时，箭头键会按1个间隔向左或向右移动缩放窗口的起始边界。
When the left slider has the focus, the arrow keys will move the starting boundary of the zoom window by 1 interval left or right.
当焦点在左滑块上时，箭头键会按1个间隔向左或向右移动缩放窗口的起始边界。
When the left slider has the focus, the arrow keys will move the starting boundary of the zoom window by 1 interval left or right.
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