Hi, hoping some people could help me with some drag and drop of mime data

I have a treeview and a standardItemModel I have subclassed.
I'd like to drag and drop within the view to sort the items.
And a line to indicate where would be perfect.

I've looked at this thread and I've picked up lots of ideas.
http://www.qtcentre.org/forum/f-qt-p...icon-2304.html

However I cant make it work.. spent a few days trying

If I implement only these :

Qt Code: 
  1. void MyTreeView::dragMoveEvent (QDragMoveEvent *event)
  2. {
  3.  
  4.   dropSite = event->answerRect ( );
  5.   model_->emit_layoutChanged();
  6. }
  7.  
  8. void MyModel::emit_layoutChanged ( )
  9. {
  10.    emit layoutChanged ( );
  11. }
  12.  
  13. void MyTreeView::paintEvent ( QPaintEvent* event )
  14. {
  15.   QTreeView::paintEvent (event);
  16.   QPainter painter ( viewport() );
  17.    int x, y, w, h;
  18.    dropSite.getRect ( &x, &y, &w, &h );
  19.    painter.drawLine ( 0, y, width(), y );
  20.    event->accept();  
  21. }
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I get a line drawn although it doesnt stick to between items and draws behind at all pixel positions. However Its not a mime data drag and drop and so its a floating icon type which I want to avoid.

Now, if I implement :


Qt Code: 
  1. void MyTreeView::mousePressEvent(QMouseEvent *event)
  2. {
  3.   QTreeView::mousePressEvent ( event );
  4.   if (event->button() == Qt::LeftButton) {
  5.     dragStartPosition = event->pos();
  6.   }
  7.   repaint();
  8. }
  9.  
  10. void MyTreeView::mouseMoveEvent(QMouseEvent *event)
  11. {
  12.   if (!(event->buttons() & Qt::LeftButton))
  13.     return;
  14.   if ((event->pos() - dragStartPosition).manhattanLength()
  15.        < QApplication::startDragDistance())
  16.     return;
  17.  
  18.   QByteArray encodedData;
  19.   mimeData = new QMimeData;
  20.   // Sample text type mime data - I will use mybe row index to pass data instead
  21.   mimeData->setData("application/vnd.text.list", encodedData);  
  22.  
  23.   drag = new QDrag(this);
  24.   drag->setMimeData(mimeData);
  25.   dropAction =  drag->start ( Qt::CopyAction | Qt::MoveAction );
  26.   repaint();
  27. }
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I get a mime type drag and drop which I want but I cannot drop it on the Treeview anywhere. I get the no entry sign

I have these turned on:

treeView->setDragEnabled(true);
treeView->setDropIndicatorShown(true);
treeView->setAcceptDrops(true);

I guess I need to implement something in here :
Qt Code: 
  1. bool MyModel::dropMimeData ( const QMimeData * data, Qt::DropAction action, int row, int column, const QModelIndex & parent )
  2. {
  3.   qDebug("dropMimeData");
  4.   if (action == Qt::CopyAction) {
  5.      return true;
  6.   }
  7.   else {
  8.     return false;
  9.   }
  10. }
To copy to clipboard, switch view to plain text mode 

but this never gets called when I drop.

What am I missing and any tips ? Mybe someone else find this useful.
Thanks,