code: func (v *Box) QueryChildPacking(child IWidget) (expand, fill bool, padding uint, packType PackType) {
  	var cexpand, cfill C.gboolean
  	var cpadding C.guint
  	var cpackType C.GtkPackType
  
  	C.gtk_box_query_child_packing(v.native(), child.toWidget(), &cexpand,
  		&cfill, &cpadding, &cpackType)
  	return gobool(cexpand), gobool(cfill), uint(cpadding), PackType(cpackType)
  }
docs: // QueryChildPacking() is a wrapper around gtk_box_query_child_packing().