doing a thing after the form is displayed

[franco.amato]

Good morning this is what I would implement:
just after that the main form is created and displayed I would connect to a database.
I tried to add the code to connect to the database in the ctor of the main application but it connect before the main form is displayed. How can I avoid this behavior?
Regards

[Lykurg]

Put the connection statements in an extra function and call it, after the main form was created/shown.

[wysota]

QMetaObject::invokeMethod(..., Qt::QueuedConnection) is also a good solution. It will run a slot only after starting the event loop.

[ChrisW67]

Or you can use a zero duration single-shot timer at the end of the constructor to have a similar effect:

MyClass::MyClass()
{
  // stuff
  QTimer::singleShot(0, this, SLOT(doConnect()));
}
 
// slot:
void doConnect()
{
  // whatever
}

MyClass::MyClass()
{
  // stuff
  QTimer::singleShot(0, this, SLOT(doConnect()));
}

// slot:
void doConnect()
{
  // whatever
}

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