how to create a subclass to rotate a text in a tabbar of tab widget

[sankarapandiyan]

: error: 'QTabBar* QTabWidget::tabBar() const' is protected

i tried,

in cpp file//

 ui->setupUi(this);
 ui->fptabwidget->setStyleSheet("QTabBar::tab{height:160px;width:64}");
    ui->fptabwidget->tabBar()->setStyle(new CustomTabStyle);
}

in header file //

#include <QProxyStyle>
#include <QStyleOption>
#include <QTabBar>


namespace Ui {
class firstpage;
}
class CustomTabStyle : public QProxyStyle {
public:
  QSize 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();
    }
    return s;
  }

  void  drawControl(ControlElement element, const QStyleOption* option, QPainter* painter, const QWidget* widget) const {
    if (element == CE_TabBarTabLabel) {
      if (const QStyleOptionTab* tab = qstyleoption_cast<const QStyleOptionTab*>(option)) {
        QStyleOptionTab opt(*tab);
        opt.shape = QTabBar::RoundedWest;
        QProxyStyle::drawControl(element, &opt, painter, widget);
        return;
      }
    }
    QProxyStyle::drawControl(element, option, painter, widget);
  }
};

i have used the proxy style but i dont know how to rotate the text
the above first line is the error ,

I think this is cleared by creating a subclass and do the followng code
but,i am not well clear about the creating the sub class .
How to do this?

Thanks in Advance ,....

[mrjj]

Hi
It seems its protected in Qt4.
So you will need to subclass and surface tabBar()

class MyTabWidget : public QTabWidget {
  Q_OBJECT
public:
  explicit MyTabWidget(QWidget* parent = Q_NULLPTR) : QTabWidget(parent)  {}
  QTabBar *GetTabBar() { return tabBar(); }
};


class CustomTabStyle : public QProxyStyle {
public:
  QSize 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();
    }
    return s;
  }

  void drawControl(ControlElement element, const QStyleOption* option, QPainter* painter, const QWidget* widget) const {
    if (element == CE_TabBarTabLabel) {
      if (const QStyleOptionTab* tab = qstyleoption_cast<const QStyleOptionTab*>(option)) {
        QStyleOptionTab opt(*tab);
        opt.shape = QTabBar::RoundedNorth;
        QProxyStyle::drawControl(element, &opt, painter, widget);
        return;
      }
    }
    QProxyStyle::drawControl(element, option, painter, widget);
  }
};

then use promotion to replace with "MyTabWidget"
http://doc.qt.io/qt-5/designer-using-custom-widgets.html

and then apply it
ui->tabWidget->GetTabBar()->setStyle(new CustomTabStyle);

and hopefully it works the same in older Qt versions.

[sankarapandiyan]

@mrjj thanks a lot

[sankarapandiyan]

@mrjj bro i got a another error !!

error: 'Q_NULLPTR' was not declared in this scope

[VRonin]

@sankarapandiyan a quick google search would have lead you to find the simple "replace Q_NULLPTR with NULL" answer

[sankarapandiyan]

@VRonin oh !!,So we are using Null instead of Q_NULPTR
thanks VRonin