Returns the current value for the requested @axis.
This function must be called from the handler of one of the
[signal@Gtk.GestureStylus::down], [signal@Gtk.GestureStylus::motion],
[signal@Gtk.GestureStylus::up] or [signal@Gtk.GestureStylus::proximity]
signals.
Returns the current value for the requested @axis.
This function must be called from the handler of one of the [signal@Gtk.GestureStylus::down], [signal@Gtk.GestureStylus::motion], [signal@Gtk.GestureStylus::up] or [signal@Gtk.GestureStylus::proximity] signals.