gtk:column-view-sorter-n-sort-columns (sorter)

sorter -- a gtk:column-view-sorter object

The unsigned integer with the number of sort columns.

Returns the number of columns by which the sorter sorts. If the sorter of the primary sort column does not determine a total order, then the secondary sorters are consulted to break the ties. Use the "changed" signal to get notified when the number of sort columns changes.

Since 4.10