A GtkScale is a slider control used to select a numeric value. To use it, you’ll probably want to investigate the methods on its base class, #GtkRange, in addition to the methods for GtkScale itself. To set the value of a scale, you would normally use gtk.range.Range.setValue. To detect changes to the value, you would normally use the #GtkRange::value-changed signal.
Fluent builder for gtk.scale.Scale
Fluent builder implementation template for gtk.scale.Scale
Module for Scale class