How to disable all options of QDialog closure

[Dariusz]

Hey

I'm in need of a QDialog that would not be closed by anything user do. How can I properly set up the widget to do it?

I tried capturing closeEvent() but esc seem to skip it somehow?

Any hints?

TIA

[mrjj]

Hi
Docs says
In order to modify your dialog's close behavior, you can reimplement the functions accept(), reject() or done(). The "closeEvent() function should only be reimplemented to preserve the dialog's position or to override the standard close or reject behavior."

So i think you should override accept(), reject() and handle it that way.

[Cobra91151]

Hello!

Additionally, you can try to make the dialog without controls by setting the code below:

setWindowFlags(Qt::Window | Qt::WindowTitleHint | Qt::CustomizeWindowHint);

The user can not minimize/maximize or close such dialog:

Also, you can modify the nativeEvent to intercept the dialog closure: https://forum.qt.io/topic/104533/how-to-ignore-the-event-when-i-click-on-the-button-to-maximize-the-window-windowmaximizebuttonhint/9

Happy coding!

[JonB]

@Cobra91151 said in How to disable all options of QDialog closure:

The user can not minimize/maximize or close such dialog:

I cannot test this, but OOI what does pressing Alt+F4 under Windows on this dialog do?

[Cobra91151]

@JonB

Hello! Here is how it intercepts the Alt+F4.

So, as you can see, setting window flags and overriding the native event will help to prevent the dialog from closing.

[JonB]

@Cobra91151 said in How to disable all options of QDialog closure:

and overriding the native event

Indeed! My question was whether this was required to make it work robustly; if you only do the setWindowFlags() I wondered whether the keyboard shortcut would still cause closure?

[Cobra91151]

@JonB

Even when setWindowFlags are set, you have to intercept the dialog closure using the nativeEvent.

Code:

bool TestDlg::nativeEvent(const QByteArray &eventType, void *message, long *) {
    qDebug() << eventType;
    MSG *msg = static_cast<MSG *>(message);

#ifdef __linux__
    //Linux code here
#elif _WIN32
    if (msg->message == WM_SYSCOMMAND) {
        if (msg->wParam == SC_CLOSE) {
            QMessageBox::information(this, "Test", "Closing...", QMessageBox::Ok);
            //Add your code here
            return true;
        }
    }
#endif

    return false;
}

[JonB]

@Cobra91151
Which is what I suspected, hence the question.

Your original answer made the nativeEvent interception look "optional" ("you can modify"), now the OP knows it is mandatory.