qt5base-lts/tests/manual/qtabbar/main.cpp

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#include <QApplication>
#include <QWidget>
#include <QStackedWidget>
#include <QTabBar>
#include <QLabel>
#include <QLayout>
#include <QDesktopWidget>
#include <QTabWidget>

const int TabCount = 5;

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QWidget widget;
    QStackedWidget stackedWidget;
    QTabBar tabBar;
    tabBar.setDocumentMode(true);
    tabBar.setTabsClosable(true);
    tabBar.setMovable(true);
    tabBar.setExpanding(true);

    // top
    tabBar.setShape(QTabBar::RoundedNorth);
    // bottom
//    tabBar.setShape(QTabBar::RoundedSouth);
    // left
//    tabBar.setShape(QTabBar::RoundedWest);
    // right
//    tabBar.setShape(QTabBar::RoundedEast);

    QMap<int, QWidget*> tabs;
    for (int i = 0; i < TabCount; i++) {
        QString tabNumberString = QString::number(i);
        QLabel *label = new QLabel(QStringLiteral("Tab %1 content").arg(tabNumberString));
        tabs[i] = label;
        label->setAlignment(Qt::AlignCenter);
        stackedWidget.addWidget(label);
        tabBar.addTab(QStringLiteral("Tab %1").arg(tabNumberString));
    }

    QObject::connect(&tabBar, &QTabBar::tabMoved, [&tabs](int from, int to) {
        QWidget *thisWidget = tabs[from];
        QWidget *thatWidget = tabs[to];
        tabs[from] = thatWidget;
        tabs[to] = thisWidget;
    });

    QObject::connect(&tabBar, &QTabBar::currentChanged, [&stackedWidget, &tabs](int index) {
        if (index >= 0)
            stackedWidget.setCurrentWidget(tabs[index]);
    });

    QObject::connect(&tabBar, &QTabBar::tabCloseRequested, [&stackedWidget, &tabBar, &tabs](int index) {
        QWidget *widget = tabs[index];
        tabBar.removeTab(index);
        for (int i = index + 1; i < TabCount; i++)
            tabs[i-1] = tabs[i];
        int currentIndex = tabBar.currentIndex();
        if (currentIndex >= 0)
            stackedWidget.setCurrentWidget(tabs[currentIndex]);
        delete widget;
    });

    QLayout *layout;
    switch (tabBar.shape()) {
    case QTabBar::RoundedEast:
    case QTabBar::TriangularEast:
        tabBar.setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding);
        layout = new QHBoxLayout(&widget);
        layout->addWidget(&stackedWidget);
        layout->addWidget(&tabBar);
        break;
    case QTabBar::RoundedWest:
    case QTabBar::TriangularWest:
        tabBar.setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding);
        layout = new QHBoxLayout(&widget);
        layout->addWidget(&tabBar);
        layout->addWidget(&stackedWidget);
        break;
    case QTabBar::RoundedNorth:
    case QTabBar::TriangularNorth:
        tabBar.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Minimum);
        layout = new QVBoxLayout(&widget);
        layout->addWidget(&tabBar);
        layout->addWidget(&stackedWidget);
        break;
    case QTabBar::RoundedSouth:
    case QTabBar::TriangularSouth:
        tabBar.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Minimum);
        layout = new QVBoxLayout(&widget);
        layout->addWidget(&stackedWidget);
        layout->addWidget(&tabBar);
        break;
    }

    layout->setMargin(0);
    widget.resize(QApplication::desktop()->screenGeometry(&widget).size() * 0.5);
    widget.show();

    return app.exec();
}