Different behavior of QMessageBox in Mac that in Windows

[maria.v]

I have this code that shows a pop up with a message while a time-consuming operation runs. When the operation ends the message dissapear.

This works fine in mac but in Windows, the pop up appears and disapears inmediatly.

How can I fix this?

void myMainWindow::loadingModal(QString msg)
{
    QMessageBox msgBox(pqCoreUtilities::mainWidget());
    msgBox.setText("<p align='center'>" + msg + "</p>");
    msgBox.setStandardButtons(0);
    msgBox.setStyleSheet("margin-right: 20px;"
                         "margin-top: 20px;"
                         "color: rgb(72, 66, 66);"
                         "font-family: NunitoSans-SemiBold;"
                         "font-size: 14px;"
                         "font-weight: 600;");
    msgBox.show();

    pqEventDispatcher::processEventsAndWait(100);
}

void myMainWindow::btn_calculate_pressed()
{
   // code
   loadingModal("Wait until calculation ends.")
   // time-consuming task starts


}

[SGaist]

Hi,

It's just sheer luck that it is working on macOS and I would even go further saying it's a bug.

The call to show is not blocking hence you reach the end of the method and msgBox gets destroyed so you won't see it.