title: Qt LEFT CTRL Key Code
body: <p>In Qt's <code>QKeyEvent</code> I can check whether <kbd>Ctrl</kbd> was pressed by checking if <code>ev-&gt;key()</code> is <code>Qt::Key_Control</code>. But how can I distinguish between the left and right <kbd>Ctrl</kbd> keys?</p>
  
  <p>I also need the same thing for <kbd>Alt</kbd> and <kbd>Shift</kbd> keys.</p>