If a user dragged the column left or right, it meant that he was repositioning the column as a unit. If the user dragged the column up or down, it meant that he was interspersing the values of one column with the values of another.

• 如果用户左右拖动某栏，就意味着他将该栏作为一个单元重新定位；如果用户上下拖动某栏，则将该栏的值插入到另一栏。