HI!

I want to move a scene with mouse (left mouse button with CTRL). I use this code:

Qt Code: 
  1. void GraphicsView::mousePressEvent (QMouseEvent *event)
  2. {
  3.     if (event->button () == Qt::LeftButton && event->modifiers ().testFlag (Qt::ControlModifier))
  4.     {
  5.         setDragMode (QGraphicsView::ScrollHandDrag);
  6.         setInteractive (false);
  7.  
  8.         _originX = event->x ();
  9.         _originY = event->y ();
  10.     }
  11.     else
  12.     {
  13.         QGraphicsView::mousePressEvent (event);
  14.     }
  15. }
  16.  
  17. void GraphicsView::mouseMoveEvent (QMouseEvent *event)
  18. {
  19.     if (event->buttons () & Qt::LeftButton && event->modifiers ().testFlag (Qt::ControlModifier))
  20.     {
  21.         QPointF oldp = mapToScene (_originX, _originY);
  22.         QPointF newp = mapToScene (event->pos ());
  23.         QPointF translation = newp - oldp;
  24.  
  25.         translate (translation.x (), translation.y ());
  26.  
  27.         _originX = event->x ();
  28.         _originY = event->y ();
  29.         return;
  30.     }
  31.  
  32.     QGraphicsView::mouseMoveEvent (event);
  33. }
  34.  
  35. void GraphicsView::mouseReleaseEvent (QMouseEvent *event)
  36. {
  37.     if (event->button () == Qt::LeftButton && event->modifiers ().testFlag (Qt::ControlModifier))
  38.     {
  39.         setDragMode (QGraphicsView::NoDrag);
  40.         setInteractive (true);
  41.     }
  42.     else
  43.     {
  44.         QGraphicsView::mouseReleaseEvent (event);
  45.     }
  46. }
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And this code is not work.