c_gtk_drawing_area_set_draw_func

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)
void function(GtkDrawingArea* self, GtkDrawingAreaDrawFunc drawFunc, void* userData, GDestroyNotify destroy) c_gtk_drawing_area_set_draw_func;

Meta