QTableView to display only leaves of a tree model

Question

Assume I have a tree structure (tree leaves in bold, sorry for the dots):

---

• A
• • A1
• • A2
• B
• • B1
• • • B11
• • B2
• C

---

stored in a QAbstractItemModel (with set parent/child relations).

How to display only the tree leaves in a QTableView?

Basic idea was to implement a QSortFilterProxyModel. Intuition suggested there would be a way to iterate through the tree and return a valid index if the item is a leaf, or QModelIndex() if not.

// QAbstractItemModel *model;
m_leavesModel.setSourceModel(model); // QSortFilterProxyModel m_leavesModel;
m_leavesTableView->setModel(&m_leavesModel);

At the moment I can only display "first level" items - A, B and C, just below the root.