gtk:icon-view-columns (object)

object -- a gtk:icon-view widget
columns -- an integer for the number of columns

Accessor of the columns slot of the gtk:icon-view class. Determines in how many columns the icons are arranged. If columns is -1, the number of columns will be chosen automatically to fill the available area. The gtk:icon-view implementation is deprecated since 4.10. Use the gtk:grid-view implementation instead.