Base class for widgets that manipulate the value of a GtkAdjustment.
GtkRange is the base class for widgets that allow a user to manipulate the value of a GtkAdjustment. In PHP-GTK 1.0 those widgets are GtkScale and GtkScrollbar.
GtkRange is an abstract class and may not be directly instantiated.
get_adjustment() Returns the widget's adjustment child. set_adjustment() Sets the adjustment child. set_update_policy() Sets the widgets update policy.