QTabWidget 如何把标签页放在左侧

搜索了几个代码实现，显示效果都不是很理想。

• windows 4k Height (30)

可以看到 背景上有个不知道什么字符

• windows 4k Height (35)

背景上的字符变小

• mac 4k Height (35)

MAC 里简直不能看

代码，网上搜到的基本都是这样修改的：

qtabwidgetex.cpp

#include "qtabwidgetex.h"

QTabBarStyle::QTabBarStyle(QStyle *parent) : QProxyStyle(parent)
{

}

void QTabBarStyle::drawControl(ControlElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget = nullptr) const
{
    if(element == CE_TabBarTabLabel)
    {
        const QStyleOptionTab *tab = qstyleoption_cast<const QStyleOptionTab *>(option);
        if(tab)
        {
            QStyleOptionTab opt(*tab);
            opt.shape = QTabBar::RoundedNorth;
            //opt.icon = QIcon(":/res/11.ico");
            //opt.text = "Hello";
            //opt.palette.setCurrentColorGroup(QPalette::Disabled);
            //opt.state |= QStyle::State_Sunken;
            QProxyStyle::drawControl(element, &opt, painter, widget);
        }
    }

    QProxyStyle::drawControl(element, option, painter, widget);
}

QSize QTabBarStyle::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();
        s.setWidth(120);
        s.setHeight(35);
    }
    return s;
}


QTabWidgetEx::QTabWidgetEx(QWidget *parent) : QTabWidget(parent)
{
    m_tabbar = new QTabBar(this);
    m_tabbar->setMovable(false);
    m_tabbar->setStyle(new QTabBarStyle());
    this->setTabBar(m_tabbar);
    this->setTabPosition(QTabWidget::West);
}

QTabWidgetEx::~QTabWidgetEx()
{

}

qtabwidgetex.h

#ifndef QTABWIDGETEX_H
#define QTABWIDGETEX_H

#include <QWidget>
#include <QTabWidget>
#include <QTableWidgetItem>
#include <QTabBar>
#include <QProxyStyle>
#include <QPainter>


class QTabBarStyle : public QProxyStyle
{
    Q_OBJECT
public:
    explicit QTabBarStyle(QStyle *style = nullptr);

    void drawControl(ControlElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget) const override;
    QSize sizeFromContents(ContentsType type, const QStyleOption *option, const QSize &size, const QWidget *widget) const override;
};

class QTabWidgetEx : public QTabWidget
{
    Q_OBJECT
public:
    explicit QTabWidgetEx(QWidget *parent = nullptr);
    ~QTabWidgetEx();

signals:

public slots:

private:
    QTabBar *m_tabbar;
};

#endif // QTABWIDGETEX_H

完整工程连接： https://cowtransfer.com/s/5add1fda5fe44b