Qt, QDialog buttons not Respondig - c++

Question

The dialog opens with two buttons, OK and Cancel. None of the buttons responds to user click. I have to press the X on the top right to cancel the dialog.
bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
if (obj == mTabWidget && event->type() == QEvent::MouseButtonDblClick)
{
// query and set tab(s) names
QTabWidget *tab = qobject_cast<QTabWidget *>(obj);
if(tab)
{
QDialog dlg;
QVBoxLayout la(&dlg);
QLineEdit ed;
la.addWidget(&ed);
QDialogButtonBox bb(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
la.addWidget(&bb);
dlg.setLayout(&la);
if(dlg.exec() == QDialog::Accepted)
{
tab->setTabText(0, ed.text());
return true;
}
}
}
// Standard event processing
return QObject::eventFilter(obj, event);
}
Am I missing any connect() line or signals? I tried to read the Qt documentation, but from what I understood, calling QDialogButtonBox::OK gets processed as Accepted.
UPDATE :
New Dialog Function
OK, i have created a new function that takes care of the Dialog box, i am calling it from the event function. it is still not responding, now on the terminal, i see an error that says, : no such slot MainWindow::accept() and another for reject. I know that i have no slots for these two in the .h file. i tried to find how to build the slots but i couldnt, any help would be great. thank you
void MainWindow::initializeBOX()
{
QDialog dlg;
QVBoxLayout la(&dlg);
QLineEdit ed;
la.addWidget(&ed);
//QDialogButtonBox bb(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
//btnbox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
QDialogButtonBox *buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
connect(buttonBox, SIGNAL(accepted()), this, SLOT(accept()));
connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));
la.addWidget(buttonBox);
dlg.setLayout(&la);
if(dlg.exec() == QDialog::Accepted)
{
mTabWidget->setTabText(0, ed.text());
}
}

Answer 1

Rather than launching the dialog from event filer you should trap QWidget::mouseDoubleClickEvent by overloading that virtual function in your code. And as long as it is a callback already you can do more stuff immediately from there including the dialog. Or maybe send the signal to slot that does the dialog (a bit cleaner). I would do the signal from mouseDoubleClickEvent event handler and make the parent QWidget::mouseDoubleClickEvent to consume the event to avoid possible complications especially when porting the code to other platform.
Event filters are for non-standard event processing. There is nothing non-standard in your case.