If no area is specified when creating the tree view column with [gtk.tree_view_column.TreeViewColumn.newWithArea] a horizontally oriented [gtk.cell_area_box.CellAreaBox] will be used.
TreeViewColumn.cellArea
gtk.cell_area.CellArea cellArea() @propertyGet cellArea property.
Returns
The [gtk.cell_area.CellArea] used to layout cell renderers for this column.