From help : (model view tutorial)
Views manage selections within a separate selection model, which can be retrieved with the selectionModel() method. We retrieve the selection Model in order to connect a slot to its selectionChanged() signal.
So, I have now something likethis:
Qt Code: 
  1. QItemSelectionModel *selectionModel= Table>selectionModel();
  2.      connect(selectionModel, SIGNAL(selectionChanged (const QItemSelection &, const QItemSelection &)),
  3.              this, SLOT(selectionChangedSlot(const QItemSelection &, const QItemSelection &)));
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Ok, now it works (not very well but I have not the last problems)

And, I can to reimplement the currentChanged slot or is it forbidden ?

PS: I pray everyday in order QT people include more information into QT Reference