How to select an item in QTreeWidget?

Question

I am trying to make a functionality, that will select the last item in the QTreeView, if there are no items selected. I don't know how to select an item within the program. So far I have tried this, but it doesn't work.

if (selectedItemList.length() == 0) // no items selected
    {
        QItemSelectionModel *selection = new QItemSelectionModel(treeWidget->model());
        QModelIndex index = treeWidget->model()->index(treeWidget->model()->rowCount() - 1,
                                                       0, QModelIndex());
        selection->select(index, QItemSelectionModel::Select);
        treeWidget->setSelectionModel(selection);
        return;
    }

treeWidget is a QTreeWidget object and selectedItemList is the list of selected items in it. I would appreciate all help.

Lahiru Chandima · Answer 1 · 2015-05-13T11:40:48.890

4

if (treeWidget->selectedItems().size() == 0 && treeWidget->topLevelItemCount())
{
    treeWidget->topLevelItem(treeWidget->topLevelItemCount() - 1)->setSelected(true);
}

edited May 13 '15 at 11:40

answered May 13 '15 at 11:17

Lahiru Chandima

22,324
22
103
179

The `setItemSelected` method is [on the deprecated list](http://doc.qt.io/qt-5/qtreewidget-obsolete.html) and it is therefore discouraged to use it. The selection can be done using the item directly – Bowdzone May 13 '15 at 11:20

score 2 · Answer 2 · answered May 13 '15 at 11:25

2

You can interact with the selection directly using the items.

QList<QTreeWidgetItem*> selectedItemList = tree->selectedItems();
if (selectedItemList.length() == 0) // no items selected
{
    tree->topLevelItem(tree->topLevelItemCount()-1)->setSelected(true);
}

answered May 13 '15 at 11:25

Bowdzone

3,827
11
39
52

The item is not being selected with this. I think QTreeView works like this that after the focus on an item is lost, the last item in the tree is being focused by default, but it is not selected visibly for sure. – Łukasz Przeniosło May 14 '15 at 06:00

How to select an item in QTreeWidget?

2 Answers2