c_gdk_device_get_axis_value

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
gboolean function(GdkDevice* device, gdouble* axes, GdkAtom axisLabel, gdouble* value) c_gdk_device_get_axis_value;

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