Close button only for some tabs in Qt

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

Answer 1

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 2

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 3

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

Answer 4

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 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.