Qt Connect Parent widget connects to the signal slot of the parental control

QT signal Slot system is not the same kind of intermediate transfer data artifact, if the connection between the parent-child space signal slot is very important, in the parent class when instantiating subclasses must pay attention to the parent class, or the signal slot can not be used, such as Kawai Class is a dialog box dialog class, do not forget to add this

New Qtclass (this); QC->exec ();

Then, if you need to connect to the slot function of the parent control, simply add a sentence in the constructor of the subclass:

Connect (This, SIGNAL (SIGNAL)), Parentwidget (), slot (slot ()));

Qt Connect Parent widget connects to the signal slot of the parental control