QObject::connect(TAB, SIGNAL(tabCloseRequested(int)), this, SLOT(closeTabRequest(int)));

class TabBar : public QTabBar
{
    Q_OBJECT
signals:
    void doubleClicked(int);
public:
    TabBar(QWidget *parent = 0);
protected:
    void mouseDoubleClickEvent(QMouseEvent * event) {
        int pos=tabAt(event->pos());
        if (event->button()==Qt::LeftButton && pos!=-1)
            emit doubleClicked(pos);
    }
};

class TabWidget : public QTabWidget
{
    Q_OBJECT
public:
    explicit TabWidget(QWidget *parent = 0): QTabWidget(parent)
    , m_tabBar(new TabBar(this))
{//Trace trace(Q_FUNC_INFO);
    connect(m_tabBar, SIGNAL(doubleClicked(int)), this, SIGNAL(newTab(int)));
    setTabBar(m_tabBar);
}
signals:
    void newTab(int);
private:
    TabBar *m_tabBar;
};

class MyTabWidget : public QTabWidget
{
    Q_OBJECT
public:
    MyTabWidget(QWidget *parent = 0) : QTabWidget(parent)
    {
        tabBar()->installEventFilter(this);
    }

signals:
    void tabBarDoubleClicked();

protected:
    bool eventFilter(QObject *o, QEvent *e)
    {
        if (o != tabBar())
            return false;

        if (e->type() == QEvent::MouseButtonDblClick) {
            QMouseEvent *me = static_cast<QMouseEvent *>(e);

            if (tabBar()->tabAt(me->pos()) != -1)
            {
                emit tabBarDoubleClicked();
            }

            return true;
        }
        return false;
    }
};