The spin button update policy determines whether the spin button displays
values even if they are outside the bounds of its adjustment.
See gtk_spin_button_set_update_policy().
Members
GTK_UPDATE_ALWAYS
When refreshing your GtkSpinButton, the value is
always displayed.
Value: 0
Available since: 3.0
GTK_UPDATE_IF_VALID
When refreshing your GtkSpinButton, the value is
only displayed if it is valid within the bounds of the spin button’s adjustment.