Russian Qt Forum

void QTabBar::changeEvent(QEvent *e)
{
    Q_D(QTabBar);
    if (e->type() == QEvent::StyleChange) {
        d->elideMode = Qt::TextElideMode(style()->styleHint(QStyle::SH_TabBar_ElideMode, 0, this));
        d->useScrollButtons = !style()->styleHint(QStyle::SH_TabBar_PreferNoArrows, 0, this);
    }
    d->refresh();
    QWidget::changeEvent(e);
}

connect(this, SIGNAL(currentChanged(int)), this, SLOT(slot_setCurrentIndex(int)));
//...
void TabWidget::slot_setCurrentIndex(int index)
{
	Q_UNUSED(index)

	QEvent event(QEvent::ModifiedChange);
	QApplication::sendEvent(tabBar(), &event);
}

class MyTabBar : public QTabBar
{
  Q_OBJECT
  public:
    MyTabBar (QWidget * parent = 0) : QTabBar(parent)
    { 
      button = QRect();
      curItemRect = QRect();
    }
  protected:  
    void paintEvent(QPaintEvent *e)
    {
      if (e->region().contains(curItemRect)){
        const QSize s = size();
        QResizeEvent *re = new QResizeEvent(s, s);
        resizeEvent(re);
        delete re;
      }
      
      QTabBar::paintEvent(e);
      
      if (e->region().contains(curItemRect))
        drawButton(button); 
    }
    void resizeEvent(QResizeEvent *e)
    {   
      QTabBar::resizeEvent(e);
      curItemRect = tabRect(currentIndex());
      button = QRect(curItemRect.right() - 35, curItemRect.top(), 35, curItemRect.height());
    }
    QSize tabSizeHint(int index) const
    {
      QSize size = QTabBar::tabSizeHint(index);
      if (index == currentIndex()){
        size.setWidth(size.width() + 40);
      }
      return size;
    }
    virtual void drawButton(const QRect &rect)
    {
      QPainter painter(this);
            
      painter.drawText(rect, 
        Qt::AlignHCenter | Qt::AlignVCenter, QString("(X)"));
    }
  private:
    QRect button;
    QRect curItemRect;
};