Qtableview, insert and selection

[noValue]

Hi There,

just playing around with Qtableview.
What I want to do is insert a new row, scroll to it, and show it selected.

I have a working insert with the following code connected to a button


private void insert()
{
String Nr="999";
model.insertRow(model.rowCount());
model.setData(model.index(model.rowCount()-1,0), Integer.parseInt(Nr));
}

I achieved to scroll down the view by doing:


insertButton.clicked.connect(view, "scrollToBottom()");

But I can't accomplish to select the inserted row automaticly.
Tried view.selectrow in my insert routine and fumbled with a selectionmodel but all failed in the end
with a NullPointerException.

I' am aware this is a very basic question and tried my best to squeeze the answer out of google, but
nothing got me on track, so any hint would be greatly appreciated.

Thanks

[tbscope]

Your try with a selectionmodel is the correct one.
Create a selectionmodel and attach it to your tableview.
Then use the selectionmodel to select the modelindex of your inserted row.

[noValue]

thanks a lot for your quick respond.

I connected the selectionmodel to the view as propsed and added


SM.select(model.index(model.rowCount()-1, 0),QItemSelectionModel.SelectionFlag.Select );

to my insert routine, wich gives me again a NullPointerException.

I miss something, do I!?

[noValue]

ah, sorted out the NullPointerException which was nothing but a typo.
So, now I don't get any errors anymore, but the row isn't selected either.

[Lykurg]

What's with QTableView::selectRow()?

[noValue]

What's with QTableView::selectRow()?

thanks, for responding...
that was my first approach,I tried:


view.selectRow(model.rowCount()-1)

no error message, but also no selected row.
Tried also simply selecting row nr. 1, same effect -> nothing.

Here is some more info about how I bound model & view & SM together:


model.setTable(eTable);
model.sort(0, Qt.SortOrder.AscendingOrder);
model.setEditStrategy(QSqlTableModel.EditStrategy. OnManualSubmit);
model.select();
view.setModel(model);
view.setSelectionBehavior(QAbstractItemView.Select ionBehavior.SelectRows);
view.setSelectionMode(QAbstractItemView.SelectionM ode.SingleSelection);
QItemSelectionModel SM = new QItemSelectionModel(model);
view.setSelectionModel(SM);

Maybe something wrong there?

[tbscope]

Here's an example with a simple QStringListModel.

I have created a window with a listview, a lineedit and a pushbutton.

Define the following variables:
QStringListModel *model;
QItemSelectionModel *selectionModel;
QStringList data;

Then assign them to the listview and connect the clicked signal of the button to a slot.
data.clear();
model = new QStringListModel(this);
model->setStringList(data);
selectionModel = new QItemSelectionModel(model);
ui->listView->setModel(model);
ui->listView->setSelectionModel(selectionModel);
connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(addAndSelect()));

The most interesting happens inside the slot:
void MainWindow::addAndSelect()
{
data << ui->lineEdit->text();
model->setStringList(data);
QModelIndex index = model->index(data.count()-1, 0);
selectionModel->setCurrentIndex(index, QItemSelectionModel::Select);
}

This is what happens:
1. Add the new line to the stringlist data;
2. Reset the stringlist in the stringlistmodel;
3. Get the modelindex of the last item;
4. Set the current item in the selectionmodel to the last item.

[noValue]

Hi tbscope,

thanks for your detailed example.
Pushed me in the right direction, even though I can't see why me first experiments with
selectionmodel didn't worked out. Maybe something wrong with obtaining the index from the model.

Anyway, after I revised my code according to your approach, everything is working fine.

Thanks again.