How to modify the C code of MainWindow class ?

[Anonymous_Banned275]

ADDNDUM

Question

If I build an new class - using QTDesigner - can it reuse same ui form as the original QMainWindow class?
I would actually build standard QT designer form class that change the ui.

` I am trying to use QT "terminal" example as a subwindow in MDI class.

I do not know HOW to modify the existing class - from QMainWIndow to
QWidget or QDialog

I did try just to replace MainWindow and it was a disaster.

I really need help with the actual C code .

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QSerialPort>

QT_BEGIN_NAMESPACE

class QLabel;

namespace Ui {
class MainWindow;
}

QT_END_NAMESPACE

class Console;
class SettingsDialog;

class MainWindow : public QMainWindow
{
Q_OBJECT

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

private slots:
void openSerialPort();
void closeSerialPort();
void about();
void writeData(const QByteArray &data);
void readData();

void handleError(QSerialPort::SerialPortError error);

private:
void initActionsConnections();

private:
void showStatusMessage(const QString &message);

Ui::MainWindow *m_ui = nullptr;
QLabel *m_status = nullptr;
Console *m_console = nullptr;
SettingsDialog *m_settings = nullptr;
QSerialPort *m_serial = nullptr;

};

#endif // MAINWINDOW_H

//! [0]
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
m_ui(new Ui::MainWindow),
m_status(new QLabel),
m_console(new Console),
m_settings(new SettingsDialog),
//! [1]
m_serial(new QSerialPort(this))
//! [1]
{
//! [0]
m_ui->setupUi(this);
m_console->setEnabled(false);
setCentralWidget(m_console);

m_ui->actionConnect->setEnabled(true);
m_ui->actionDisconnect->setEnabled(false);
m_ui->actionQuit->setEnabled(true);
m_ui->actionConfigure->setEnabled(true);

m_ui->statusBar->addWidget(m_status);

initActionsConnections();

connect(m_serial, &QSerialPort::errorOccurred, this, &MainWindow::handleError);

//! [2]
connect(m_serial, &QSerialPort::readyRead, this, &MainWindow::readData);
//! [2]
connect(m_console, &Console::getData, this, &MainWindow::writeData);
//! [3]
}
//! [3]

[Christian Ehrlicher]

I don't see c code anywhere (only c++ code) and also no question from your side.
Also you should be long enough here to know that you have to tag your code pieces so it gets readable...

[Pl45m4]

@AnneRanch said in How to modify the C code of MainWindow class ?:

I do not know HOW to modify the existing class - from QMainWIndow to
QWidget or QDialog

Create a new QDialog class in Designer, copy/paste your code there and exchange QMainWindow with your new class. Probably you have to make some more changes in your logic, because a plain QWidget doesn't have a QStatusBar by default like QMainWindow does.
Or you change your class in place including your ui file... But you can mess this up very easily, so that your designed widget isn't recognized by uic anymore.

[Anonymous_Banned275]

@Pl45m4 I did try that already - did not work well since I was not sure what to copy...
I am currently fixing my code so it compiles / runs again ....
I am thinking of making a C_Terminal class and add current MainWindow to it as a member....
Not sure if that is proper or what to call such convoluted setup.

However, I just want to reuse exiting code as much as feasible.