Qt tabWidget设置tab左右显示时 文字横向显示_qtabwidget标签文字横向

 Qt自带tabwidget当设置tab左右显示时，tab中文字纵向显示，要想文字横向显示，得重写tab。

步骤1：继承tab,重绘tab

#ifndef CUSTABBAR_H
#define CUSTABBAR_H
 
#include <QObject>
#include <QTabBar>
 
class CusTabBar : public QTabBar
{
public:
    CusTabBar();
    QSize tabSizeHint(int index) const override;
  protected:
      void paintEvent(QPaintEvent *) override;//重绘tab文字
};
 
#endif // CUSTABBAR_H
 
#include "custabbar.h"
#include <QStylePainter>
#include <QStyleOptionTab>
CusTabBar::CusTabBar()
{
 
}
 
QSize CusTabBar::tabSizeHint(int index) const
{
    QSize s = QTabBar::tabSizeHint(index);
      s.transpose();
      return s;
}
 
void CusTabBar::paintEvent(QPaintEvent *)
{
    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);//西方向
      painter.translate(-c);
      painter.drawControl(QStyle::CE_TabBarTabLabel,opt);
      painter.restore();
 
    }
}

步骤2：创建tabwidget

#ifndef KTABWIDGET_H
#define KTABWIDGET_H
 
#include <QObject>
#include <custabbar.h>
#include <QTabWidget>
class KTabWidget : public QTabWidget
{
public:
    explicit   KTabWidget();
//protected:
 
};
 
#endif // KTABWIDGET_H
 
 
 
 
#include "ktabwidget.h"
 
KTabWidget::KTabWidget()
{
this->setTabBar(new CusTabBar());

步骤三：根据创建的tabwidget,创建tabwidget：

m_pTabWidget = new KTabWidget;
QWidget *w1 = new QWidget;
  w1->setStyleSheet("background-color:rgb(54,54,54)");
 
  QWidget *w2 = new QWidget;
  w2->setStyleSheet("background-color:rgb(54,154,54)");
 
  QWidget *w3 = new QWidget;
  w3->setStyleSheet("background-color:rgb(54,54,154)");
 
   m_pTabWidget->setTabPosition(QTabWidget::East);
  m_pTabWidget->insertTab(0, w1, "tab1");
  m_pTabWidget->insertTab(1, w2, "tab2");
  m_pTabWidget->insertTab(2, w3, "tab3");