Wait until QWidget closes

The QWidget will  be  close:

In MyClass inherit QDialog.  modal will be open with  dialog  exec()

void MainWindow::createMyDialog()
{
  MyClass dialog(this);
  dialog.exec();
}

Just click this link   http://qt-project.org/doc/qt-4.8/qdialog.html

The alternative code is:

#include <QEventLoop>
 
void doStuff()
{
    // Creating an instance of myClass
    MyClass myInstance;
    // (optional) myInstance.setAttribute(Qt::WA_DeleteOnClose);
    myInstance.show();
 
    // This loop will wait for the window is destroyed
    QEventLoop loop;
    connect(this, SIGNAL(destroyed()), & loop, SLOT(quit()));
    loop.exec();
}