How can I add a “new tab” button next to the tabs of a QMdiArea in tabbed view mode?

Question

I\'d like to have a \"new tab\" button much like Chrome or Firefox has for my QMdiArea.

I can make a button or menu item somewhere that adds a new subdo

Answer 1

First, add an empty tab to your widget, and connect the currentChanged signal:

TabsView::TabsView(QWidget *parent) :
  QWidget(parent),
  ui(new Ui::TabsView)
{
    ui->setupUi(this);
    ui->tabWidget->clear();
    ui->tabWidget->addTab(new QLabel("+"), QString("+"));
    connect(ui->tabWidget, &QTabWidget::currentChanged, this, &TabsView::onChangeTab);
    newTab();
}

Then, on your onChangeTab slot, check if the user is clicking on the last tab, and call newTab:

void TabsView::onChangeTab(int index)
{
    if (index == this->ui->tabWidget->count() - 1) {
        newTab();
    }
}

Finally, on your newTab method, create the new tab and select it:

void TabsView::newTab()
{
    int position = ui->tabWidget->count() - 1;
    ui->tabWidget->insertTab(position, new QLabel("Your new tab here"), QString("New tab"));
    ui->tabWidget->setCurrentIndex(position);
    auto tabBar = ui->tabWidget->tabBar();
    tabBar->scroll(tabBar->width(), 0);
}