QGraphicsView and QTreeView synchronous scrolling

[freely]

Hi,

I have coded a GUI where there are QGraphicsView and QTreeView placed, loaded, activated and used.

There is a need to move QGraphicsScene, that is “assigned” ( set ) to the QGraphicsView downward and upward ( a.k.a to scroll vertically and horizontally ) using set scroll bars ( scroll bar policy set to both widgets as ScrollBarAlwaysOn ) synchronously with QTreeView, so that when one of the widgets is scrolled on some number of pixels, to scroll the second as well.

The widgets scrolling connected using next code:

connect(ui->treeView,SIGNAL(scrolled(int,int)),this,SLOT(scroll_gv(int,int)));
 
          connect(ui->graphicsView,SIGNAL(scrolled(int,int)),this,SLOT(scroll_tv(int,int)));
 
 
 
          ...
 
 
 
 
 
      void MainWindow::scroll_gv(int dx,int dy)
 
      {
 
          ui->graphicsView->scroll(dx,dy);
 
      }
 
 
 
      void MainWindow::scroll_tv(int dx,int dy)
 
      {
 
          ui->treeView->scroll(dx,dy);
 
      }

connect(ui->treeView,SIGNAL(scrolled(int,int)),this,SLOT(scroll_gv(int,int)));
   
          connect(ui->graphicsView,SIGNAL(scrolled(int,int)),this,SLOT(scroll_tv(int,int)));
   
       
   
          ...
   
      
   
       
   
      void MainWindow::scroll_gv(int dx,int dy)
   
      {
   
          ui->graphicsView->scroll(dx,dy);
  
      }
  
       
  
      void MainWindow::scroll_tv(int dx,int dy)
  
      {
  
          ui->treeView->scroll(dx,dy);
  
      }

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where the scroll is added to custom classes inherited from QGraphicsView and QTreeView and virtual function reimplemented:

void QCTreeView::scrollContentsBy ( int dx, int dy )
 
      {
 
          emit scrolled(dx,dy);
 
      }
 
 
 
      void qcgraphicsview::scrollContentsBy ( int dx, int dy )
 
      {
 
          emit scrolled(dx,dy);
 
      }

void QCTreeView::scrollContentsBy ( int dx, int dy )
   
      {
   
          emit scrolled(dx,dy);
   
      }
   
       
   
      void qcgraphicsview::scrollContentsBy ( int dx, int dy )
   
      {
   
          emit scrolled(dx,dy);
   
      }

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The problem to correct is next, when I scroll one of the widgets, the second is scrolled as well, but somehow not accurate – all the area of the widget is scrolled and not a widgets internals,

The scrolling behavior is recorded in next video clip:

https://www.box.com/s/lpaon61oly45fffyu3kn

Will you hint why such problem, what properties of the widgets to set, how to code correctly in order the synchronous scroll will work ?

Thanks in advance for your help.