How to find the row from which drag has started QTableView - c++

Question

I was working on QTableView and I want to achieve drag and drop on it.
The way I want it is:
When I drag, I want to take out the row which is to be dragged and place an empty place holder there, this is how I have reimplemented dragEnterEvent:
void dragEnterEvent ( QDragEnterEvent * event )
{
if( event->source() == this )
{
// Get the row to be dragged
int mItemDraggedRowPosition = rowAt( event->pos().y() );
auto currentModel = model();
auto standardModel = boost::polymorphic_cast< QStandardItemModel *>( currentModel );
// Take out the dragged row
QList<QStandardItem *> mDraggedItem = standardModel->takeRow ( ( mItemDraggedRowPosition ) );
// Insert an empty row there
standardModel->insertRow( ( mItemDraggedRowPosition ), new QStandardItem() );
}
event->accept();
}
}
Now the problem I am facing here is the row number which I am getting is incorrect some times.
Am I not doing it correctly .?
Is there any alternative way to find out the row from which the drag was started,
seems like the way I am trying to get it:
int mItemDraggedRowPosition = rowAt( event->pos().y() );
does not return correct value always.

Answer 1

I finally reproduced problem and I got incorrect values too (drag very close to the joining area of 2 rows). So I solved this issue with next event filter:
ui->tableView->setDragEnabled(true);//somewhere in constructor
ui->tableView->setAcceptDrops(true);
//...
bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
if (obj == ui->tableView->viewport() && event->type() == QEvent::DragEnter)
{
QDragEnterEvent * e = static_cast<QDragEnterEvent *>(event);
qDebug( ) << ui->tableView->rowAt(e->pos().y());
}
return QObject::eventFilter(obj, event);
}
To use eventFilter you should also:
protected:
bool eventFilter(QObject *obj, QEvent *event);//in header
and
qApp->installEventFilter(this);//in constructor

Answer 2

I finally ended up overriding "mousePressEvent" and saving the start position there.
I use the same saved position in "dragEnterEvent".
This one works perfectly for me.
void
PrePressView::TableWidget::mousePressEvent( QMouseEvent * inEvent )
{
if ( inEvent->button() == Qt::LeftButton )
{
int rowToMove = rowAt( inEvent->y() );
}
}