How to get selection changed notification in QTreeView

Question

I am trying to figure this out and it seems like I have to use QItemSelectionModel but I can't find an example how to wire things up.

I have defined in .h file.

QItemSelectionModel* selectionModel;

Now in constructor of the view, I set:

selectionModel = ui->treeView->selectionModel();

// the following line is not compiling!
connect(ui->treeView->selectionModel(), SIGNAL( ui->treeView->selectionModel(const QModelIndex&, const QModelIndex &) ),
        this, this->selectionChanged ( QItemSelection & sel,  QItemSelection & desel) ); 

I thought there would be predefined slot but I can't find one so I added this one (the syntax of which I found here)

void MyDialog::selectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
{
    qDebug() << "Item selection changed";
}

I also tried replacing QItemSelection with QModelIndex but still doesn't work.

What do I need to do in order to simply get notified when selection has changed and than obviously grab the newly selected item?

Answer 1

the QObject::connect method should be used as follow :

QObject::connect(sender, SIGNAL(signal_method), receiver, SLOT(slot_method));

so in your case it should be something like

connect(selectionModel, SIGNAL(selectionChanged(const QItemSelection&,const QItemSelection&)), this, SLOT(mySelectionChanged(const QItemSelection&,const QItemSelection&)));