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#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include "test.h"
 
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
 
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
    void set_tw_check_file_insert_row();
 
 
private slots:
    void on_pushButton_clicked();
 
private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::set_tw_check_file_insert_row()
{
        ui->tableWidget->insertRow(ui->tableWidget->rowCount());
}

#ifndef TEST_H
#define TEST_H
 
 
class Test
{
public:
    Test();
    void calculate();
};
 
#endif // TEST_H

#include "test.h"
#include "mainwindow.h"
 
Test::Test()
{
 
}
 
void Test::calculate()
{
    MainWindow mw;
    mw.set_tw_check_file_insert_row();
}

set_tw_check_file_insert_row();