title: Focus on many QGraphicsItem in Qt
body: <p>To set focus on a <a href="http://doc.qt.io/qt-5/qgraphicsitem.html" rel="nofollow noreferrer">QGraphicsItem</a> I use the <code>setFocus()</code> function.</p>
  
  <p>However what if I need to set focus on two or more <a href="http://doc.qt.io/qt-5/qgraphicsitem.html" rel="nofollow noreferrer">QGraphicsItem</a> in the same scene at the same time? If this is possible, how would I do this?</p>