Gtk.SpinButtonUpdatePolicy

The spin button update policy determines whether the spin button displays values even if they are outside the bounds of its adjustment. See Gtk.SpinButton.prototype.set_update_policy.

SpinButtonUpdatePolicy.ALWAYS

When refreshing your Gtk.SpinButton, the value is always displayed

SpinButtonUpdatePolicy.IF_VALID

When refreshing your Gtk.SpinButton, the value is only displayed if it is valid within the bounds of the spin button's adjustment