Thank you very much for your help.

Even if it's a very silly question, I have to ask it (sorry 'bout that):

Whats the "correct" way to implement the dragEnterEvent and dragMoveEvent functions - is this the way?


Qt Code: 
  1. void myQTTreeWidget::dragEnterEvent(QDragEnterEvent *e)
  2. {
  3.     // always call base class implementation 
  4.     QTreeWidget::dragEnterEvent(e);
  5.  
  6.     if ( isDragEnterPossible(e) )
  7.     {
  8.         e->accept();
  9.     }
  10.     else
  11.     {
  12.         e->ignore();
  13.     }
  14. }
  15.  
  16. void myQTTreeWidget::dragMoveEvent(QDragMoveEvent *e)
  17. {
  18.     // always call base class implementation 
  19.     QTreeWidget::dragMoveEvent(e);
  20.  
  21.     if ( isDragMovePossible(e) )
  22.     {
  23.         e->accept();
  24.     }
  25.     else
  26.     {
  27.         e->ignore();
  28.     }
  29. }
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isDragMovePossible and isDragEnterPossible are member functions, returning a bool value and telling us if dropping is possible.