I'm having problems getting my drag and drop working for a QTreeView. Everything was working fine a couple of months ago but somewhere along the line it stopped working. I've managed to get the drag and drop itself working again, but I do not get a drop indicator, and the tree doesn't expand regardless of how long I hover the drop over it.

My tree view code looks like this:
Qt Code: 
  1. MyTreeView::MyTreeView(QWidget *parent) :
  2.     QTreeView(parent)
  3. {
  4.     setSelectionMode(QAbstractItemView::SingleSelection);
  5.     viewport()->setAcceptDrops(true);
  6.     setDragEnabled(true);
  7.     setDropIndicatorShown(true);
  8.     setAutoExpandDelay(0);
  9.     setIndentation(16);
  10. }
  11.  
  12. void MyTreeView::dragEnterEvent(QDragEnterEvent *event)
  13.  {
  14.     event->acceptProposedAction();
  15.  }
  16.  
  17. void MyTreeView::dragMoveEvent(QDragMoveEvent *event)
  18.  {
  19.     event->acceptProposedAction();
  20.  }
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I don't know if this code matters in this case, but this is my subclassed standard item model:
Qt Code: 
  1. MyItemModel::MyItemModel(QWidget *topWidget, QObject *parent) :
  3. {
  4.     w = topWidget;
  5. }
  6.  
  7. Qt::DropActions MyItemModel::supportedDropActions() const
  8. {
  9.     return Qt::CopyAction | Qt::MoveAction;
  10. }
  11.  
  12. Qt::ItemFlags MyItemModel::flags(const QModelIndex &index) const
  13. {
  14.     QString type = index.data(FileTypeRole).toString();
  15.  
  16.     // We should only be able to drop onto folders.
  17.     if (type != "File" && type != "ImageFile" && index.isValid())
  18.         return Qt::ItemIsDropEnabled | Qt::ItemIsSelectable | Qt::ItemIsUserCheckable | Qt::ItemIsEnabled;
  19.     else
  20.         return Qt::ItemIsSelectable | Qt::ItemIsUserCheckable | Qt::ItemIsEnabled;
  21. }
  22.  
  23. bool MyItemModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent)
  24. {
  25. 	// this all works fine, so I'm cutting it for brevity.
  26. }
  27.  
  28. QStringList MyItemModel::mimeTypes () const
  29. {
  30.     QStringList qstrList;
  31.     // This is a list of the accepted mime types for dropping.
  32.     qstrList.append("text/uri-list");
  33.     return qstrList;
  34. }
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Everything works as far and drag and drop goes, but it makes it difficult to control where you are dropping with a visual indicator and without the tree expanding for you. Any tips on how to fix this would be greatly appreciated.