Yes, it is a property. There is a getter that returns the current edit triggers in use, and there is a setter which you can use to change the edit triggers. Don't you think the setter would perhaps take a parameter, like suggested by your compiler? Not to be rude, but perhaps it's time to get back to your favourite C++ book for a while?

PS. Here's the link to the documentation once more, because the first one seemed to be broken: QAbstractItemView::editTriggers