#include <QDebug>
 
  #ifdef Q_OS_SYMBIAN
  #include <QSymbianEvent>
  #include <w32std.h>
  #endif
 
 
  class MyApplication : public QApplication
  {
  public:
    MyApplication( int argc, char** argv ) : QApplication( argc, argv ) {}
 
  #ifdef Q_OS_SYMBIAN
  protected:
    bool symbianEventFilter( const QSymbianEvent* symbianEvent ) {
      const TWsEvent *event = symbianEvent->windowServerEvent();
 
      if( !event ) {
        return false;
      }
 
      switch( event->Type() ) {
        case EEventFocusGained: {
          qDebug() << "Focus gained";
          break;
        }
        case EEventFocusLost: {
          qDebug() << "Focus lost";
          break;
        }
        default:
          break;
      }
 
      // Always return false so we don't stop
      // the event from being processed
      return false;
    }
  #endif // Q_OS_SYMBIAN
  };