I have a QTreeView subclassed, and it has a QStandardModel so as to be able to provide headers. I add items to the model from a database, namely servers and the connections to them. There are multiple connections to every server, with a default of 4. The code I have adds the connections under the servers, with no indentation and no arrow or + sign to collapse the servers and make the connections invisible. I assume that I'm adding the connections wrong and they are not being added as children.

Qt Code: 
  1. ServerList::ServerList( QWidget *p)
  2. {
  3.   parent = p;
  4.   model = new QStandardItemModel( 0, 1 );
  5.   model->setHeaderData( 0, Qt::Horizontal, "Server List" );
  6.   setModel( model );
  7.   setSelectionMode( QAbstractItemView::SingleSelection );
  8.   ///Set up the actions for the right-click context menu
  9.   connectToServer = new QAction(tr("Connect"), this);
  10.   separator = new QAction(this);
  11.   separator->setSeparator(true);
  12.   newServer = new QAction(tr("New Server"), this);
  13.   editServer = new QAction(tr("Edit Server"), this);
  14.   deleteServer = new QAction(tr("Delete Server"), this);
  15.   ///Set up the menu
  16.   menu = new QMenu();
  17.   menu->addAction(connectToServer);
  18.   menu->addAction(separator);
  19.   menu->addAction(newServer);
  20.   menu->addAction(editServer);
  21.   menu->addAction(deleteServer);
  22.   ///Connect the actions
  23.   connect( connectToServer, SIGNAL( triggered() ), this, SLOT( connectToServerSlot() ) );
  24.   connect( newServer, SIGNAL( triggered() ), this, SLOT( newServerSlot() ) );
  25.   connect( editServer, SIGNAL( triggered() ), this, SLOT( editServerSlot() ) );
  26.   connect( deleteServer, SIGNAL( triggered() ), this, SLOT( deleteServerSlot() ) );
  27. }
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Qt Code: 
  1. void ServerList::addItem( const QString &hostName, quint16 port, const QString& username,
  2.                           const QString& password, quint16 timeout, quint16 numberConnections )
  3. {
  4.   QModelIndex parent = model->index( 0, 0, parent );
  5.   int rows = model->rowCount( parent );
  6.   model->insertRows( rows, 1, parent );
  7.   QModelIndex index = model->index( rows, 0, parent );
  8.   model->setData( index, hostName );
  9.   Server ns( hostName, port, username, password, timeout, numberConnections );
  10.   server.append( ns );
  11.   for( int x = 0; x < numberConnections; x++ ){
  12.     QModelIndex parentServer = model->index( rows, 0, index );
  13.     int serverRow = model->rowCount( parentServer );
  14.     model->insertRows( serverRow, 1, parentServer );
  15.     QModelIndex connectionIndex = model->index( serverRow, 0, parentServer );
  16.     QString s("Connection #");
  17.     s += QString::number( x + 1 );
  18.     model->setData( connectionIndex, s );
  19.   }
  20. }
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