Cell(spanSize: Int)
Identifies the item of a line. In a vertical grid, the cell can take the space of multiple columns. The number of columns this cell take is defined with spanSize. In an horizontal grid, the cell can take the space of multiple rows. The number of rows this cell take is defined with spanSize.
spanSize - the width (number of columns) in a vertical grid, the height (number of rows) in an horizontal grid.