I have a solution using an event filter shown below.

One would think that one would be able to intercept an event of type QEvent;;Drop heading for the TreeViews but I was unable to detect one. Strange...Unless it is the MetaCall event it receives just after the drop. Since I could not make use of the information in the meta call event I can't know if it was the Drop event or not.

At anyrate, the QEvent::ChildRemoved event type proved to work just as well. Perhaps even better since I should only get that when the model/view accepts the drop and I don't have to put in lots of ugly code to send the event and check its return to see if the drop was accepted or not.

Enjoy...

-Mic

Qt Code: 
  1. #include <QtGui>
  2.  
  3. class MainWindow : public QMainWindow
  4. {
  5.     Q_OBJECT
  6.  
  7.     public:
  8.         MainWindow( QWidget *parent = 0 ) : QMainWindow( parent)
  9.         {
  10.             splitter = new QSplitter( this );
  11.  
  12.             model = new QDirModel( this );
  13.             model->setReadOnly( false );
  14.  
  15.             tree = new QTreeView;
  16.             tree->setModel( model );
  17.             tree->setRootIndex( model->index( QString( "/home/randy" ) ) );
  18.  
  19.             model1 = new QDirModel( this );
  20.             model1->setReadOnly( false );
  21.  
  22.             righttree = new QTreeView;
  23.             righttree->setModel( model1 );
  24.             righttree->setRootIndex( model1->index( QString( "/tmp" ) ) );
  25.  
  26.             tree->setDragEnabled( true );
  27.             tree->setAcceptDrops( true );
  28.             tree->setDropIndicatorShown( true );
  29.             tree->setDragDropOverwriteMode( false );
  30.             tree->installEventFilter( this );
  31.  
  32.             righttree->setDragEnabled( true );
  33.             righttree->setAcceptDrops( true );
  34.             righttree->setDropIndicatorShown( true );
  35.             righttree->setDragDropOverwriteMode( false );
  36.             righttree->installEventFilter( this );
  37.  
  38.             splitter->addWidget( tree );
  39.             splitter->addWidget( righttree );
  40.  
  41.             setCentralWidget( splitter );
  42.         }
  43.  
  44.         bool eventFilter( QObject *target, QEvent *event )
  45.         {
  46.             if( target == tree && event->type() == QEvent::ChildRemoved ) {
  47.                 model->refresh( tree->rootIndex() );
  48.             }
  49.             else if( target == righttree && event->type() == QEvent::ChildRemoved ) {
  50.                 model1->refresh( righttree->rootIndex() );
  51.             }
  52.             return false;
  53.         }
  54.  
  55.     private:
  56.         QSplitter *splitter;
  57.         QDirModel *model;
  58.         QTreeView *tree;
  59.         QDirModel *model1;
  60.         QTreeView *righttree;
  61.         QTimer    *timer;
  62. };
  63.  
  64. int main( int argc, char *argv[] )
  65. {
  66.     // a "file manager" at simplest :)
  67.     QApplication a( argc, argv );
  68.     MainWindow window;
  69.     window.show();
  70.     return a.exec(  );
  71. }
  72.  
  73. #include "app.moc"
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