Selecting a row in QTreeView programmatically

By using the Qitem selection :

selection->select (
    QItemSelection (
       treeview->model ()->index (search, 0),
       treeview->model ()->index (search, treeview->model ()->columnCount () - 1)),
    QItemSelectionModel::Select);

Click  to set the choice action:

treeview->setSelectionBehavior (QAbstractItemView::SelectRows)

Row in QTreeView programmatically:

Unified the  row using an QItemSelection.

selection->select(idx, QItemSelectionModel::Select | QItemSelectionModel::Rows);

By clearing the solutions:

selection->select(idx, QItemSelectionModel::ClearAndSelect | QItemSelectionModel::Rows);