HYTOS

                    item = self.selection_order.pop(0)

                    stream = [item for item in self.selection_order if issubclass(type(item), SymbolSvgItem) or type(item) is QEngineeringLineItem]

                    values = [item for item in self.selection_order if issubclass(type(item), QEngineeringTextItem)]

                    if item and not stream and not values:

                        return

                    if len(stream) != 2 or len(values) % 2 != 0:

                        return

                                            up_down_find[index].owner = stream_line[index]

                                            key.Freeze = True

                                            break

        except Exception as ex:

            message = f"error occurred({repr(ex)}) in {sys.exc_info()[-1].tb_frame.f_code.co_filename}:" \

                        f"{sys.exc_info()[-1].tb_lineno}"

            self.addMessage.emit(MessageType.Error, message)

    def on_recognize_line(self):

        """recognize lines in selected area"""