Closable QTabWidget tabs, but not all of them - c++

Question

In a Qt/C++ piece of code, I have a QTabWidget class with different tabs.
I would like to add a last "+" tab, so when the user is clicking on it, I create a new tab.
However I would like to have all my tabs closable ('x' at the right of the tab), except the last one where I don't want the 'x' to be displayed. How can I have this granularity in the closable flag ?

Answer 1

Surprised to see that this is not yet answered. Had some time and I have implemented a working example. Note that instead of using one of the tabs as your "+" button, I have used QToolButton thereby making it simpler to make tabs closable with QTabWidget::setTabsClosable(bool)
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QTabWidget>
#include <QToolButton>
#include <QLabel>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private:
Ui::MainWindow *ui;
QTabWidget* _pTabWidget;
private slots:
void slotAddTab();
void slotCloseTab(int);
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
_pTabWidget = new QTabWidget(this);
this->setCentralWidget(_pTabWidget);
// Create button what must be placed in tabs row
QToolButton* tb = new QToolButton(this);
tb->setText("+");
// Add empty, not enabled tab to tabWidget
_pTabWidget->addTab(new QLabel("Add tabs by pressing \"+\""), QString());
_pTabWidget->setTabEnabled(0, false);
// Add tab button to current tab. Button will be enabled, but tab -- not
_pTabWidget->tabBar()->setTabButton(0, QTabBar::RightSide, tb);
// Setting tabs closable and movable
_pTabWidget->setTabsClosable(true);
_pTabWidget->setMovable(true);
connect(tb,SIGNAL(clicked()),this,SLOT(slotAddTab()));
connect(_pTabWidget,SIGNAL(tabCloseRequested(int)),this,SLOT(slotCloseTab(int)));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::slotAddTab()
{
QWidget* newTab = new QWidget(_pTabWidget);
_pTabWidget->addTab(newTab, tr("Tab %1").arg(QString::number(_pTabWidget->count())));
_pTabWidget->setCurrentWidget(newTab);
}
void MainWindow::slotCloseTab(int index)
{
delete _pTabWidget->widget(index);
}
main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}