QTabWidget customization

[Lykurg]

Go ahead blaming me because of a typo. You also seem to not have understand the relation between tags like "Guru" and time of posting. Beside, I didn't gave me the title "Guru". It is just related on how many post you do here. Even if they are crap. So please do not blame me for things I am not responsible for. But anyway go on, dish the dirt, I do not care.

Or you can start spending the time solving your problem. As I am not very willing to help you after such comment (problem is the language not necessarily the content), but for the sake of peace I give a starting point. You just have to change it for your needs:

class CustomTabStyle : public QProxyStyle
{
public:
    QSize sizeFromContents(ContentsType type, const QStyleOption *option,
                           const QSize &size, const QWidget *widget) const
    {
        QSize s = QProxyStyle::sizeFromContents(type, option, size, widget);
        if (type == QStyle::CT_TabBarTab)
            s.transpose();
        return s;
    }
 
    void drawControl(ControlElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget) const
    {
        if (element == CE_TabBarTabLabel)
        {
            if (const QStyleOptionTab *tab = qstyleoption_cast<const QStyleOptionTab *>(option))
            {
                QStyleOptionTab opt(*tab);
                opt.shape = QTabBar::RoundedWest;
                QProxyStyle::drawControl(element, &opt, painter, widget);
                return;
            }
        }
        QProxyStyle::drawControl(element, option, painter, widget);
    }
};
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
    QTabBar tb;
    tb.setStyle(new CustomTabStyle);
    tb.addTab("Tab 1");
    tb.addTab("Tab 2");
    tb.show();
 
    return a.exec();
}

class CustomTabStyle : public QProxyStyle
{
public:
    QSize sizeFromContents(ContentsType type, const QStyleOption *option,
                           const QSize &size, const QWidget *widget) const
    {
        QSize s = QProxyStyle::sizeFromContents(type, option, size, widget);
        if (type == QStyle::CT_TabBarTab)
            s.transpose();
        return s;
    }

    void drawControl(ControlElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget) const
    {
        if (element == CE_TabBarTabLabel)
        {
            if (const QStyleOptionTab *tab = qstyleoption_cast<const QStyleOptionTab *>(option))
            {
                QStyleOptionTab opt(*tab);
                opt.shape = QTabBar::RoundedWest;
                QProxyStyle::drawControl(element, &opt, painter, widget);
                return;
            }
        }
        QProxyStyle::drawControl(element, option, painter, widget);
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QTabBar tb;
    tb.setStyle(new CustomTabStyle);
    tb.addTab("Tab 1");
    tb.addTab("Tab 2");
    tb.show();
    
    return a.exec();
}

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To protect me against an other shit storm about how a Guru can write such a code: It is not the most elegant solution - I know -, but it is easy, quick and working.

EDIT: For a good starting point of reading: http://qt-project.org/doc/qt-4.8/style-reference.html (section Tabs)