转自：https://forum.qt.io/topic/92923/qtabbar-paintevent-issue/4
#include <QApplication> #include <QStyleOptionTab> #include <QStylePainter> #include <QTabBar> #include <QTabWidget> class 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(); } } }; class TabWidget : public QTabWidget { public: TabWidget(QWidget *parent=0):QTabWidget(parent){ setTabBar(new TabBar); setTabPosition(QTabWidget::West); } }; int main(int argc, char *argv[]) { QApplication a(argc, argv); TabWidget w; w.addTab(new QWidget, "tab1"); w.addTab(new QWidget, "tab2"); w.addTab(new QWidget, "tab3"); w.show(); return a.exec(); }