Close button only for some tabs in Qt - c++

Question

I am using Qt for an assignment I have for college, and I want to use QTabWidget to display a chat window much like Pidgin's. I want to make the "group chat" tab always open and impossible to close and the rest of the "private channel" tabs closable.
QTabWidget's setTabsClosable(bool) is not helping.
Any ideas?

Answer 1

I found an easier solution, I think.
Simply access the relevant close button and resize it.
tabWidget->tabBar()->tabButton(0, QTabBar::RightSide)->resize(0, 0);

Answer 2

Find the bar (it is private, so use findChild()) and remove the buttons. Documentation claims that close buttons may be placed on left side too.
QTabBar *tabBar = ui->tabWidget->findChild<QTabBar *>();
tabBar->setTabButton(0, QTabBar::RightSide, 0);
tabBar->setTabButton(0, QTabBar::LeftSide, 0);

Answer 3

Hallo,
I guess this post won't help the author of this thread but perhaps someone else wanders over here.
In most cases a non-closable tab should not only ignore the closevent it also should not show a close symbol in its corner. A nice way to reach this is to modify the QTabBar which is inside the QTabWidget.
Example:
// let tabWidget be a QTabWidget with at least one page
QPushButton *closeButton = new QPushButton();
// set icon and size for PushButton, ...
// connect Signal clicked() from closeButton with Slot closeCurrentTab(), ...
// next line sets closeButton in right corner on tab with index 0
tabWidget->tabBar()->setTabButton(0, QTabBar::RightSide, closeButton);

Answer 4

Although tabBar() is indeed protected, Klaus pointed into the right direction. Simply subclass QTabWidget and implement a wrapper method.

Answer 5

You should reimplement your widget's event(Event *e) method, check the type of e, find out CloseEvents, and call parent class's event when you can allow tab to close, or e->ignore() when you do not want it.
Note, then you must parent's event() handle othr events, so do not accept(), reject() or forget them Ж)

Answer 6

I guess you can handle the tabCloseRequest signal and decide whether u'll close a given tab or not
http://doc.qt.io/archives/4.6/qtabwidget.html#tabCloseRequested
Edit: I created a small example to check it out. My example is a simple QtGui application with a mainwindow that has a tabwidget. I then added the tabCloseRequested slot. Here is the code
void MainWindow::on_tabWidget_tabCloseRequested(int index)
{
if(someCondition){
return;
} else if(anotherCondition){
ui->tabWidget->removeTab(index);
}
}
From this example only tabs where the condition doesn't apply will be closed.

Answer 7

The best way for adding a pushbutton to some tabs and not in other is to define a subclass of QTabWidget for taking the QTabBar that is a potected!
The code below is tested and it works:
//TabWidget.h
#ifndef TABWIDGET_H
#define TABWIDGET_H
#include <QTabWidget>
class TabWidget : public QTabWidget {
public:
TabWidget(QWidget *parent);
~TabWidget();
QTabBar *tabBar() const;
};
#endif /* TABWIDGET_H */
//TabWidget.cpp
#include "TabWidget.h"
TabWidget::TabWidget(QWidget * p=0) : QTabWidget(p) {}
TabWidget::~TabWidget() {}
QTabBar * TabWidget::tabBar() const {return QTabWidget::tabBar();}
For using this subclass and create a new tab with a custom button you have to following this instructions ( ui->tabWidget is a QTabWidget with setClosableTabs=false):
TabWidget *t = (TabWidget *) ui->tabWidget;
t->addTab(new QWidget, "empty");
QTabBar *tab = t->tabBar();
QPushButton *b = new QPushButton();
b->setText("x");
tab->setTabButton(tab->count() -1, QTabBar::RightSide, b);
connect(b,SIGNAL(...),this,SLOT(...));

Answer 8

Not sure, why nobody here mentioned the simplest working solution:
tabWidget->tabBar()->setTabButton(0, QTabBar::RightSide, 0);
This completely removes the close button, and the space taken by it.
Documentation