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void MainWindow::keyPressEvent(QKeyEvent* event)
{

  switch(event->key())
  {
   case Qt::Key_Up:
      QMessageBox msgBox;
      msgBox.setWindowTitle(trUtf8("Внимание!"));
      msgBox.setText(trUtf8("Уведомление:"));
      msgBox.setInformativeText(trUtf8("Нажата кнопка ВВЕРХ."));
      msgBox.setIcon(QMessageBox::Information);
      msgBox.exec();
      break;

  }
}

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    wgOpenGL = new glTest(ui->ViewOpenGl);
    ui->ViewOpenGl->setFocusPolicy(Qt::StrongFocus);
    ui->ViewOpenGl->setFocus(Qt::ActiveWindowFocusReason);
}

void MainWindow::keyPressEvent( QKeyEvent *event )
{
    wgOpenGL->keyPressEvent(event);

}

void glTest::keyPressEvent(QKeyEvent* event)
{

  switch(event->key())
  {
   case Qt::Key_Up:
    qDebug() << "Key Up pressed!";
        setXRotation(xRot + 5);
    qDebug() << trUtf8("Объект повернут на 10 градусов по оси Х");
    break;

   case Qt::Key_Down:
    qDebug() << "Key Down pressed!";
    setXRotation(xRot - 5);
    break;

   case Qt::Key_Left:
    qDebug() << "Key Left pressed!";
    setYRotation(yRot + 5);
    break;

   case Qt::Key_Right:
    qDebug() << "Key Right pressed!";
    setYRotation(yRot - 5);
    break;

  }

  updateGL();

}

void MainWindow::keyPressEvent( QKeyEvent *event )
{
    wgOpenGL->keyPressEvent(event);
}

void MainWindow::keyPressEvent( QKeyEvent *event )
{
    wgOpenGL->keyPressEvent(event);
}

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    wgOpenGL = new glTest(ui->ViewOpenGl);
    qDebug() << "ViewOpenGl have focus - " << ui->ViewOpenGl->hasFocus();
    ui->ViewOpenGl->setFocusPolicy(Qt::StrongFocus);
    ui->ViewOpenGl->setFocus(Qt::MouseFocusReason);
    qDebug() << "ViewOpenGl have focus - " << ui->ViewOpenGl->hasFocus();
}

void MainWindow::keyPressEvent( QKeyEvent *event )
{
       qDebug() << "************************************************************";
       qDebug() << "ViewOpenGl have focus - "       << ui->ViewOpenGl->hasFocus();
       qDebug() << "centralWidget have focus - "    << ui->centralWidget->hasFocus();
       qDebug() << "Exit have focus - "             << ui->Exit->hasFocus();
       qDebug() << "mainToolBar have focus - "      << ui->mainToolBar->hasFocus();
       qDebug() << "menuBar have focus - "          << ui->menuBar->hasFocus();
       qDebug() << "statusBar have focus - "        << ui->statusBar->hasFocus();
       qDebug() << "************************************************************";

       wgOpenGL->keyPressEvent(event);

}

ViewOpenGl have focus -  false 
ViewOpenGl have focus -  false 
************************************************************ 
ViewOpenGl have focus -  true 
centralWidget have focus -  false 
Exit have focus -  false 
mainToolBar have focus -  false 
menuBar have focus -  false 
statusBar have focus -  false 
************************************************************ 
Key Up pressed! 

qDebug() << "Widget have focus - " << qApp->focusWidget()->objectName();

void MainWindow::init()
{
     QObject::connect(qApp, SIGNAL(focusChanged()), this, SLOT(findFW()));
}

void MainWindow::findFW()
{
    qDebug() << "Widget have focus - " << qApp->focusWidget()->objectName();
}


class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();

    void init();

public slots:
    void findFW();

protected:
    //void keyPressEvent( QKeyEvent *event );

private:
    glTest *wgOpenGL;
    Ui::MainWindow *ui;

};

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    wgOpenGL = new glTest(ui->ViewOpenGl);
    qDebug() << "ViewOpenGl have focus - " << ui->ViewOpenGl->hasFocus();
    ui->ViewOpenGl->setFocusPolicy(Qt::TabFocus);
    ui->ViewOpenGl->setFocus(Qt::TabFocusReason);
    qDebug() << "ViewOpenGl have focus - " << ui->ViewOpenGl->hasFocus();
}

void MainWindow::mousePressEvent(QMouseEvent *event)
{
    qDebug() << "*****************************************************";
    qDebug() << "ViewOpenGl have focus - " << ui->ViewOpenGl->hasFocus();
    qDebug() << "Widget have focus - " << qApp->focusWidget()->objectName();
    qDebug() << "*****************************************************";
}

ViewOpenGl have focus -  false 
ViewOpenGl have focus -  false 
***************************************************** 
ViewOpenGl have focus -  true 
Widget have focus -  "ViewOpenGl" 
*****************************************************