Qt: How to update QStringList when QListView gets new entries

I have a QListView _listView whose model is QStringListModel _model, whose QStringList is _locations. Here's the code:

_locations << "Sarajevo" << "Tesanj" << "Graz";

_model = new QStringListModel(this);
_model->setStringList(_locations);

_listView = new QListView(this);
_listView->setModel(_model);
_listView->setEditTriggers(
      QAbstractItemView::EditTrigger::DoubleClicked |
      QAbstractItemView::EditTrigger::AnyKeyPressed);

and the slots that edit the _listView:

void Dialog_EditLocations::onKey_del()
{
    QModelIndex _index;
    _index = _listView->currentIndex();
    _model->removeRow(_index.row());
}

void Dialog_EditLocations::onClick_add()
{
    if (_edAddLocation->text() == "") return;
    int row = _model->rowCount();
    _model->insertRow(row);
    QModelIndex _index;
    _index = _model->index(row);
    _model->setData(_index, _edAddLocation->text());
    _edAddLocation->clear();    
}

After editing the list in list view widget, I want to store it in a file. When I store the _locations it saves the original list from the first row of the code, even though I added new items.

How to make the code update the _locations whenever I make a new entry in the _listView, or at least how to fetch the list that is visible in the _listView?

Use QStringListModel::stringList(), it returns all current items from model that is what you see in listview widget, including any modifications (adding,removing rows).

At the end of onClick_add slot you can add:

_locations = _model->stringList();