Qt: Is there notification when event loop starts?

Question

I have a Qt application with this kind of main()...

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow   mainWin;

    ... A sep         


        

Answer 1

You can send a signal to your window before the exec() call. This will place an entry in app's signal queue. When exec() is running, the signal will be delivered and your window will know that the event loop is running.

A simple way would be to use QTimer::singleShot(0, &mainWin, SLOT(onEventLoopStarted())); which connects to a custom slot of your window class.