HsHolo/Include/CGH_TabBar.h

#pragma once
#pragma execution_character_set("utf-8")
#include <QtWidgets\qtabbar.h>
#include <QtWidgets\QStylePainter>
#include <QtWidgets\QStyleOptionTab>

class CGH_TabBar : public QTabBar {
public:
    QSize tabSizeHint(int index) const {
        QSize s = QTabBar::tabSizeHint(index);
        s.transpose();
        return s;
    }
protected:
    void paintEvent(QPaintEvent* /*event*/) {
        QStylePainter painter(this);
        QStyleOptionTab opt;

        for (int i = 0; i < count(); i++)
        {
            initStyleOption(&opt, i);
            painter.drawControl(QStyle::CE_TabBarTabShape, opt);
            painter.save();

            QSize s = opt.rect.size();
            s.transpose();
            QRect r(QPoint(), s);
            r.moveCenter(opt.rect.center());
            opt.rect = r;

            QPoint c = tabRect(i).center();
            painter.translate(c);
            painter.rotate(90);
            painter.translate(-c);
            painter.drawControl(QStyle::CE_TabBarTabLabel, opt);
            painter.restore();
        }
    }
};