I want to represent a tree which has nodes that are/stay identical, but placed somewhere else:

Qt Code: 
  1. -+- John
  2.   '--+ Company A
  3.       '----- Current Stockprice: 10
  4. -+- Jane
  5.   '--+ Company A
  6.       '----- Current Stockprice: 10
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Say i want the "Company A" node with its children to be actually a single node.
Means it is identical also after updates (changes in one instance will affect all others). Its not an option to optimize it by reversing parent child hierarchy.

I tried it with a QStandardItem, but failed:

Qt Code: 
  2.      *simodel = new QStandardItemModel;                                      
  3.  
  5.      *root1 =  new QStandardItem( "John" ),                                                                                                                                                                               
  6.      *root2 =  new QStandardItem( "Jane" ),    
  7.      *leaf = new QStandardItem( "Company A" )
  8.  ;
  9.  
  10.   root1->appendRow( leaf );
  11.   root2->appendRow( leaf );
  12.  
  13.   simodel->invisibleRootItem()->appendRow( root1 );
  14.   simodel->invisibleRootItem()->appendRow( root2 );
  15.  
  16.   QTreeView *tview = new QTreeView;
  17.   tview->setModel( simodel );
  18.   tview->show();
  19.  
  20.   return app.exec();
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Gui shows:

Qt Code: 
  1. -+- John
  2.   '--+ Company A
  3. -+- Jane
  4.   '--+ ~ <Some dead node which is not rendered>
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Terminal output:
QStandardItem::insertRows: Ignoring duplicate insertion of item 0x9170758



Any hints whether this is doable with a QStandarditemModel or a custom QTreeView subclass ? The problem is remiscent of the Interview qtdemo, but I would need whole subtree's duplicated instead of single nodes.