QlistView is empty or not?

freecamellia

Hi,
Is there a method that check if a QlistView is empty or not?

andre

@
if (theView->model()->rowCount() == 0) {
//do your thing
}
@
Or something along those lines...

StephanWoebbeking

Hope it's ok to reply to this thread, even it's been created in the jura ära already? ;)

I have exactly the same question, even have the same solution, but the point is, how can find someone find out, if not the MODEL is empty, but the QListView is empty, means, it does not have a model yet attached? In my case I have a certain use case where there were no items found yet to add (on purpose), so even the model wasn't created and added to the QListView item. So view->model()->rowCount() produces a segmentation fault - which is perfectly ok, but how can I check before this request, if the model does exist already? view->model() == 0 or something? My trials were rejected by the compiler so far.

Cheers,
Stephan

StephanWoebbeking

Hope it's ok to reply to this thread, even it's been created in the jura ära already? ;)

I have exactly the same question, even have the same solution, but the point is, how can find someone find out, if not the MODEL is empty, but the QListView is empty, means, it does not have a model yet attached? In my case I have a certain use case where there were no items found yet to add (on purpose), so even the model wasn't created and added to the QListView item. So view->model()->rowCount() produces a segmentation fault - which is perfectly ok, but how can I check before this request, if the model does exist already? view->model() == 0 or something? My trials were rejected by the compiler so far.

Cheers,
Stephan

andre

Check if calling model() returns 0 on your view.

andre

Check if calling model() returns 0 on your view.

StephanWoebbeking

Ok, that works, why did I not get to that idea??? ;)

Would you use "0" or rather "NULL"?

Stephan

StephanWoebbeking

Ok, that works, why did I not get to that idea??? ;)

Would you use "0" or rather "NULL"?

Stephan

andre

0 in c++/98, nullptr in c++/11. NULL is C.

andre

0 in c++/98, nullptr in c++/11. NULL is C.

StephanWoebbeking

Great, thanks!

Stephan

StephanWoebbeking

Great, thanks!

Stephan