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

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