Significance of the row parameter in QTreeView::setRowHidden

[ajaxcrypto]

QTreeView has a setRowHidden member function. The function takes three arguments. While the second (parent QModelIndex) and the third (a boolean) are easy to understand, what does the int row parameter signify? In a tree, the rows cannot be numbered linearly trivially, does row imply the insertion order in which it was inserted to some parent? Or something else?

[joeQ]

@ajaxcrypto Hi,friend. Welcome.

In the QTreeView, when we use row, we should give the row's parent index. about this, the model/view programming. In Basic concepts section. It tell different in QListView QTableView QTreeView. It will help you better than me.

[ajaxcrypto]

So row signifies the order in which the row was inserted/added for the given parent.

[JonB]

@ajaxcrypto
No, it seems to me the http://doc.qt.io/qt-4.8/model-view-programming.html#basic-concepts link @joeQ gave you shows in the diagram what the row definition is for a Tree Model. Did you look at it?

To be clear, it is the current order of children at each level, not the order they were added --- although those two might be the same if all you do is append, you can also do inserts into the middle of the children, or deletes, which will change the row numbering.

[ajaxcrypto]

Well yes, the model will not be inserting, only appending rows so in my case, it matches the insertion order. You are completely correct however.