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diff --git a/src/quicktemplates/qquicktabbar.cpp b/src/quicktemplates/qquicktabbar.cpp
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+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "qquicktabbar_p.h"
+#include "qquicktabbutton_p.h"
+#include "qquickcontainer_p_p.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \qmltype TabBar
+    \inherits Container
+//!     \instantiates QQuickTabBar
+    \inqmlmodule QtQuick.Controls
+    \since 5.7
+    \ingroup qtquickcontrols-navigation
+    \ingroup qtquickcontrols-containers
+    \ingroup qtquickcontrols-focusscopes
+    \brief Allows the user to switch between different views or subtasks.
+
+    TabBar provides a tab-based navigation model.
+
+    \image qtquickcontrols-tabbar-wireframe.png
+
+    TabBar is populated with TabButton controls, and can be used together with
+    any layout or container control that provides \c currentIndex -property,
+    such as \l StackLayout or \l SwipeView
+
+    \snippet qtquickcontrols-tabbar.qml 1
+
+    As shown above, TabBar is typically populated with a static set of tab buttons
+    that are defined inline as children of the tab bar. It is also possible to
+    \l {Container::addItem()}{add}, \l {Container::insertItem()}{insert},
+    \l {Container::moveItem()}{move}, and \l {Container::removeItem()}{remove}
+    items dynamically at run time. The items can be accessed using
+    \l {Container::}{itemAt()} or \l {Container::}{contentChildren}.
+
+    \include container-currentindex.qdocinc {file} {TabBar} {SwipeView}
+
+    \section2 Resizing Tabs
+
+    By default, TabBar resizes its buttons to fit the width of the control.
+    The available space is distributed equally to each button. The default
+    resizing behavior can be overridden by setting an explicit width for the
+    buttons.
+
+    The following example illustrates how to keep each tab button at their
+    implicit size instead of being resized to fit the tabbar:
+
+    \borderedimage qtquickcontrols-tabbar-explicit.png
+
+    \snippet qtquickcontrols-tabbar-explicit.qml 1
+
+    \section2 Flickable Tabs
+
+    If the total width of the buttons exceeds the available width of the tab bar,
+    it automatically becomes flickable.
+
+    \image qtquickcontrols-tabbar-flickable.png
+
+    \snippet qtquickcontrols-tabbar-flickable.qml 1
+
+    \sa TabButton, {Customizing TabBar}, {Navigation Controls}, {Container Controls},
+        {Focus Management in Qt Quick Controls}
+*/
+
+class QQuickTabBarPrivate : public QQuickContainerPrivate
+{
+public:
+    Q_DECLARE_PUBLIC(QQuickTabBar)
+
+    void updateCurrentItem();
+    void updateCurrentIndex();
+    void updateLayout();
+
+    qreal getContentWidth() const override;
+    qreal getContentHeight() const override;
+
+    void itemGeometryChanged(QQuickItem *item, QQuickGeometryChange change, const QRectF &diff) override;
+    void itemImplicitWidthChanged(QQuickItem *item) override;
+    void itemImplicitHeightChanged(QQuickItem *item) override;
+
+    QPalette defaultPalette() const override { return QQuickTheme::palette(QQuickTheme::TabBar); }
+
+    bool updatingLayout = false;
+    QQuickTabBar::Position position = QQuickTabBar::Header;
+#if QT_CONFIG(wheelevent)
+    QPoint accumulatedAngleDelta;
+#endif
+};
+
+class QQuickTabBarAttachedPrivate : public QObjectPrivate
+{
+    Q_DECLARE_PUBLIC(QQuickTabBarAttached)
+
+public:
+    static QQuickTabBarAttachedPrivate *get(QQuickTabBarAttached *attached)
+    {
+        return attached->d_func();
+    }
+
+    void update(QQuickTabBar *tabBar, int index);
+
+    int index = -1;
+    QQuickTabBar *tabBar = nullptr;
+};
+
+void QQuickTabBarPrivate::updateCurrentItem()
+{
+    QQuickTabButton *button = qobject_cast<QQuickTabButton *>(contentModel->get(currentIndex));
+    if (button)
+        button->setChecked(true);
+}
+
+void QQuickTabBarPrivate::updateCurrentIndex()
+{
+    Q_Q(QQuickTabBar);
+    QQuickTabButton *button = qobject_cast<QQuickTabButton *>(q->sender());
+    if (button && button->isChecked())
+        q->setCurrentIndex(contentModel->indexOf(button, nullptr));
+}
+
+void QQuickTabBarPrivate::updateLayout()
+{
+    Q_Q(QQuickTabBar);
+    const int count = contentModel->count();
+    if (count <= 0 || !contentItem)
+        return;
+
+    qreal reservedWidth = 0;
+    int resizableCount = 0;
+
+    QList<QQuickItem *> allItems;
+    allItems.reserve(count);
+
+    for (int i = 0; i < count; ++i) {
+        QQuickItem *item = q->itemAt(i);
+        if (item) {
+            QQuickItemPrivate *p = QQuickItemPrivate::get(item);
+            if (!p->widthValid())
+                ++resizableCount;
+            else
+                reservedWidth += item->width();
+            allItems += item;
+        }
+    }
+
+    const qreal totalSpacing = qMax(0, count - 1) * spacing;
+    const qreal itemWidth = (contentItem->width() - reservedWidth - totalSpacing) / qMax(1, resizableCount);
+
+    updatingLayout = true;
+    for (QQuickItem *item : std::as_const(allItems)) {
+        QQuickItemPrivate *p = QQuickItemPrivate::get(item);
+        if (!p->widthValid()) {
+            item->setWidth(itemWidth);
+            p->widthValidFlag = false;
+        }
+        if (!p->heightValid()) {
+            item->setHeight(contentHeight);
+            p->heightValidFlag = false;
+        } else {
+            item->setY((contentHeight - item->height()) / 2);
+        }
+    }
+    updatingLayout = false;
+}
+
+qreal QQuickTabBarPrivate::getContentWidth() const
+{
+    Q_Q(const QQuickTabBar);
+    const int count = contentModel->count();
+    qreal totalWidth = qMax(0, count - 1) * spacing;
+    for (int i = 0; i < count; ++i) {
+        QQuickItem *item = q->itemAt(i);
+        if (item) {
+            QQuickItemPrivate *p = QQuickItemPrivate::get(item);
+            if (!p->widthValid())
+                totalWidth += item->implicitWidth();
+            else
+                totalWidth += item->width();
+        }
+    }
+    return totalWidth;
+}
+
+qreal QQuickTabBarPrivate::getContentHeight() const
+{
+    Q_Q(const QQuickTabBar);
+    const int count = contentModel->count();
+    qreal maxHeight = 0;
+    for (int i = 0; i < count; ++i) {
+        QQuickItem *item = q->itemAt(i);
+        if (item)
+            maxHeight = qMax(maxHeight, item->implicitHeight());
+    }
+    return maxHeight;
+}
+
+void QQuickTabBarPrivate::itemGeometryChanged(QQuickItem *item, QQuickGeometryChange change, const QRectF &diff)
+{
+    QQuickContainerPrivate::itemGeometryChanged(item, change, diff);
+    if (!updatingLayout) {
+        if (change.sizeChange())
+            updateImplicitContentSize();
+        updateLayout();
+    }
+}
+
+void QQuickTabBarPrivate::itemImplicitWidthChanged(QQuickItem *item)
+{
+    QQuickContainerPrivate::itemImplicitWidthChanged(item);
+    if (item != contentItem)
+        updateImplicitContentWidth();
+}
+
+void QQuickTabBarPrivate::itemImplicitHeightChanged(QQuickItem *item)
+{
+    QQuickContainerPrivate::itemImplicitHeightChanged(item);
+    if (item != contentItem)
+        updateImplicitContentHeight();
+}
+
+QQuickTabBar::QQuickTabBar(QQuickItem *parent)
+    : QQuickContainer(*(new QQuickTabBarPrivate), parent)
+{
+    Q_D(QQuickTabBar);
+    d->changeTypes |= QQuickItemPrivate::Geometry | QQuickItemPrivate::ImplicitWidth | QQuickItemPrivate::ImplicitHeight;
+    setFlag(ItemIsFocusScope);
+    QObjectPrivate::connect(this, &QQuickTabBar::currentIndexChanged, d, &QQuickTabBarPrivate::updateCurrentItem);
+}
+
+/*!
+    \qmlproperty enumeration QtQuick.Controls::TabBar::position
+
+    This property holds the position of the tab bar.
+
+    \note If the tab bar is assigned as a header or footer of \l ApplicationWindow
+    or \l Page, the appropriate position is set automatically.
+
+    Possible values:
+    \value TabBar.Header The tab bar is at the top, as a window or page header.
+    \value TabBar.Footer The tab bar is at the bottom, as a window or page footer.
+
+    The default value is style-specific.
+
+    \sa ApplicationWindow::header, ApplicationWindow::footer, Page::header, Page::footer
+*/
+QQuickTabBar::Position QQuickTabBar::position() const
+{
+    Q_D(const QQuickTabBar);
+    return d->position;
+}
+
+void QQuickTabBar::setPosition(Position position)
+{
+    Q_D(QQuickTabBar);
+    if (d->position == position)
+        return;
+
+    d->position = position;
+    emit positionChanged();
+}
+
+/*!
+    \since QtQuick.Controls 2.2 (Qt 5.9)
+    \qmlproperty real QtQuick.Controls::TabBar::contentWidth
+
+    This property holds the content width. It is used for calculating the total
+    implicit width of the tab bar.
+
+    \note This property is available in TabBar since QtQuick.Controls 2.2 (Qt 5.9),
+    but it was promoted to the Container base type in QtQuick.Controls 2.5 (Qt 5.12).
+
+    \sa Container::contentWidth
+*/
+
+/*!
+    \since QtQuick.Controls 2.2 (Qt 5.9)
+    \qmlproperty real QtQuick.Controls::TabBar::contentHeight
+
+    This property holds the content height. It is used for calculating the total
+    implicit height of the tab bar.
+
+    \note This property is available in TabBar since QtQuick.Controls 2.2 (Qt 5.9),
+    but it was promoted to the Container base type in QtQuick.Controls 2.5 (Qt 5.12).
+
+    \sa Container::contentHeight
+*/
+
+QQuickTabBarAttached *QQuickTabBar::qmlAttachedProperties(QObject *object)
+{
+    return new QQuickTabBarAttached(object);
+}
+
+void QQuickTabBar::updatePolish()
+{
+    Q_D(QQuickTabBar);
+    QQuickContainer::updatePolish();
+    d->updateLayout();
+}
+
+void QQuickTabBar::componentComplete()
+{
+    Q_D(QQuickTabBar);
+    QQuickContainer::componentComplete();
+    d->updateCurrentItem();
+    d->updateLayout();
+}
+
+void QQuickTabBar::geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry)
+{
+    Q_D(QQuickTabBar);
+    QQuickContainer::geometryChange(newGeometry, oldGeometry);
+    d->updateLayout();
+}
+
+bool QQuickTabBar::isContent(QQuickItem *item) const
+{
+    return qobject_cast<QQuickTabButton *>(item);
+}
+
+void QQuickTabBar::itemAdded(int index, QQuickItem *item)
+{
+    Q_D(QQuickTabBar);
+    Q_UNUSED(index);
+    QQuickItemPrivate::get(item)->setCulled(true); // QTBUG-55129
+    if (QQuickTabButton *button = qobject_cast<QQuickTabButton *>(item))
+        QObjectPrivate::connect(button, &QQuickTabButton::checkedChanged, d, &QQuickTabBarPrivate::updateCurrentIndex);
+    QQuickTabBarAttached *attached = qobject_cast<QQuickTabBarAttached *>(qmlAttachedPropertiesObject<QQuickTabBar>(item));
+    if (attached)
+        QQuickTabBarAttachedPrivate::get(attached)->update(this, index);
+    d->updateImplicitContentSize();
+    if (isComponentComplete())
+        polish();
+}
+
+void QQuickTabBar::itemMoved(int index, QQuickItem *item)
+{
+    QQuickTabBarAttached *attached = qobject_cast<QQuickTabBarAttached *>(qmlAttachedPropertiesObject<QQuickTabBar>(item));
+    if (attached)
+        QQuickTabBarAttachedPrivate::get(attached)->update(this, index);
+}
+
+void QQuickTabBar::itemRemoved(int index, QQuickItem *item)
+{
+    Q_D(QQuickTabBar);
+    Q_UNUSED(index);
+    if (QQuickTabButton *button = qobject_cast<QQuickTabButton *>(item))
+        QObjectPrivate::disconnect(button, &QQuickTabButton::checkedChanged, d, &QQuickTabBarPrivate::updateCurrentIndex);
+    QQuickTabBarAttached *attached = qobject_cast<QQuickTabBarAttached *>(qmlAttachedPropertiesObject<QQuickTabBar>(item));
+    if (attached)
+        QQuickTabBarAttachedPrivate::get(attached)->update(nullptr, -1);
+    d->updateImplicitContentSize();
+    if (isComponentComplete())
+        polish();
+}
+
+#if QT_CONFIG(wheelevent)
+void QQuickTabBar::wheelEvent(QWheelEvent *event)
+{
+    Q_D(QQuickTabBar);
+    QQuickContainer::wheelEvent(event);
+    if (d->wheelEnabled) {
+        d->accumulatedAngleDelta += event->angleDelta();
+        int xSteps = d->accumulatedAngleDelta.x() / QWheelEvent::DefaultDeltasPerStep;
+        int ySteps = d->accumulatedAngleDelta.y() / QWheelEvent::DefaultDeltasPerStep;
+        if (xSteps > 0 || ySteps > 0) {
+            decrementCurrentIndex();
+            d->accumulatedAngleDelta = QPoint();
+        } else if (xSteps < 0 || ySteps < 0) {
+            incrementCurrentIndex();
+            d->accumulatedAngleDelta = QPoint();
+        }
+    }
+}
+#endif
+
+QFont QQuickTabBar::defaultFont() const
+{
+    return QQuickTheme::font(QQuickTheme::TabBar);
+}
+
+#if QT_CONFIG(accessibility)
+QAccessible::Role QQuickTabBar::accessibleRole() const
+{
+    return QAccessible::PageTabList;
+}
+#endif
+
+/*!
+    \qmlattachedproperty int QtQuick.Controls::TabBar::index
+    \since QtQuick.Controls 2.3 (Qt 5.10)
+    \readonly
+
+    This attached property holds the index of each tab button in the TabBar.
+
+    It is attached to each tab button of the TabBar.
+*/
+
+/*!
+    \qmlattachedproperty TabBar QtQuick.Controls::TabBar::tabBar
+    \since QtQuick.Controls 2.3 (Qt 5.10)
+    \readonly
+
+    This attached property holds the tab bar that manages this tab button.
+
+    It is attached to each tab button of the TabBar.
+*/
+
+/*!
+    \qmlattachedproperty enumeration QtQuick.Controls::TabBar::position
+    \since QtQuick.Controls 2.3 (Qt 5.10)
+    \readonly
+
+    This attached property holds the position of the tab bar.
+
+    It is attached to each tab button of the TabBar.
+
+    Possible values:
+    \value TabBar.Header The tab bar is at the top, as a window or page header.
+    \value TabBar.Footer The tab bar is at the bottom, as a window or page footer.
+*/
+
+void QQuickTabBarAttachedPrivate::update(QQuickTabBar *newTabBar, int newIndex)
+{
+    Q_Q(QQuickTabBarAttached);
+    const int oldIndex = index;
+    const QQuickTabBar *oldTabBar = tabBar;
+    const QQuickTabBar::Position oldPos = q->position();
+
+    index = newIndex;
+    tabBar = newTabBar;
+
+    if (oldTabBar != newTabBar) {
+        if (oldTabBar)
+            QObject::disconnect(oldTabBar, &QQuickTabBar::positionChanged, q, &QQuickTabBarAttached::positionChanged);
+        if (newTabBar)
+            QObject::connect(newTabBar, &QQuickTabBar::positionChanged, q, &QQuickTabBarAttached::positionChanged);
+        emit q->tabBarChanged();
+    }
+
+    if (oldIndex != newIndex)
+        emit q->indexChanged();
+    if (oldPos != q->position())
+        emit q->positionChanged();
+}
+
+QQuickTabBarAttached::QQuickTabBarAttached(QObject *parent)
+    : QObject(*(new QQuickTabBarAttachedPrivate), parent)
+{
+}
+
+int QQuickTabBarAttached::index() const
+{
+    Q_D(const QQuickTabBarAttached);
+    return d->index;
+}
+
+QQuickTabBar *QQuickTabBarAttached::tabBar() const
+{
+    Q_D(const QQuickTabBarAttached);
+    return d->tabBar;
+}
+
+QQuickTabBar::Position QQuickTabBarAttached::position() const
+{
+    Q_D(const QQuickTabBarAttached);
+    if (!d->tabBar)
+        return QQuickTabBar::Header;
+    return d->tabBar->position();
+}
+
+QT_END_NAMESPACE
+
+#include "moc_qquicktabbar_p.cpp"