gtk:size-group-mode (object)

object -- a gtk:size-group object
mode -- a gtk:size-group-mode value to set for the size group

The accessor for the mode slot of the gtk:size-group class gets or sets the mode of the size group.

The mode of the size group determines whether the widgets in the size group should all have the same horizontal requisition, :horizontal, all have the same vertical requisition, :vertical, or should all have the same requisition in both directions, :both.