gtk/level_bar.go
func (v *LevelBar) GetOffsetValue(name string) (float64, bool) {
	cstr := C.CString(name)
	defer C.free(unsafe.Pointer(cstr))
	var value C.gdouble
	c := C.gtk_level_bar_get_offset_value(v.native(), (*C.gchar)(cstr), &value)
	return float64(value), gobool(c)
}
func (v *LevelBar) GetOffsetValue(name string) (float64, bool) {
	cstr := C.CString(name)
	defer C.free(unsafe.Pointer(cstr))
	var value C.gdouble
	c := C.gtk_level_bar_get_offset_value(v.native(), (*C.gchar)(cstr), &value)
	return float64(value), gobool(c)
}
// GetOffsetValue() is a wrapper around gtk_level_bar_get_offset_value().