title: How to capture a sequence of key presses and then fire an event in Qt?
body: <p>I know how to fire an event on a key press in Qt. But I need to handle a sequence. Fire event only when user presses <kbd>ctrl</kbd><kbd>alt</kbd><kbd>t</kbd>.</p>
  
  <p>How can I capture this sequence? Just tell me how can I detect which keys were pressed. </p>