How to access to parent widget on qt?

c++ linux qt kde
Giancarlo picture Giancarlo · Dec 9, 2008 · Viewed 37.5k times · Source

I have an inherited QTreeWidget (called PackList) class and its parent is a KXmlGuiWindow. How can I access to the parent's slots?

I've tried getParent()->mySlot() from the QTreeWidget class but I've got

error: no matching function for call to 'PackList::mySlot()'

Does anybody know the correct way? Thanks

Answer

Michael Bishop picture Michael Bishop · Dec 11, 2008

If you know the parent's class, you will have to cast parentWidget() to that class and then call your slot. Keep in mind whether or not it's a slot makes no difference in this case. You are just calling a method.

((KXmlGuiWindow*)parentWidget())->mySlot();

You can make the call without casting by wiring up your signal to the slot.

connect( this, SIGNAL(mySignal()), parentWidget(), SLOT(mySlot()) );

Lastly, you can use QMetaObject::invokeMethod to call it if you don't want to cast it. That's probably overkill.

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