execute function after widget is displayed.

[ChrisW67]

You can use a 0 millisecond single shot timer started from the constructor of the dialog to call the function (as a slot) after the program returns to the event loop.

MyDialog() 
{
  ...
  QTimer::singleShot(0, this, SLOT(doLongRunningThings()));
}
 
/* public or private slot */
void doLongRunningThings() 
{
}

MyDialog() 
{
  ...
  QTimer::singleShot(0, this, SLOT(doLongRunningThings()));
}

/* public or private slot */
void doLongRunningThings() 
{
}

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