QStackedWidget with multiple classes

[hobbyProgrammer]

Hi,

I just created a small app with two windows. I wanted to create 1 window with a stackedWidget that contains both ui files. I would like to edit the .h and .cpp files as minimal as possible, but like to separate both ui's in different classes.
I have 1 screen with a button. If that button is pressed, the second ui will show. The second screen is a combobox and a button.
Currently I have them combined and the build was succesfull, but the items in the second screen aren't added to the combobox. I think it's because of this line in the secondwindow.cpp:

SecWindow::SecWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)

As that might create a new Ui, but I would like to re-use the Ui from the MainWindow.
Any other suggestions on how to keep these functions in two different classes are always welcome.

This is my code:

main.cpp:

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void on_pushButton_clicked();
private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "secwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    ui->stackedWidget->setCurrentIndex(0);

}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::on_pushButton_clicked()
{
    ui->stackedWidget->setCurrentIndex(1);
    SecWindow *sw = new SecWindow(ui->stackedWidget->currentWidget());
    sw->print();
}

secwindow.h

#ifndef SECWINDOW_H
#define SECWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class SecWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit SecWindow(QWidget *parent = nullptr);
    ~SecWindow();

private:
    Ui::MainWindow *ui;
    friend class MainWindow;
    void print();
};

#endif // SECWINDOW_H

secwindow.cpp

#include "secwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>

SecWindow::SecWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

SecWindow::~SecWindow()
{
    delete ui;
}

void SecWindow::print()
{
    ui->comboBox->addItem("Item 1");
    ui->comboBox->addItem("Item 2");
}

[SGaist]

Hi,

You don't call show on your sw object and it's not part of your stacked widget.