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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Templates 2 module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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 qtquickcontrols2-navigation
+    \ingroup qtquickcontrols2-containers
+    \brief Allows the user to switch between different views or subtasks.
+
+    TabBar provides a tab-based navigation model.
+
+    \image qtquickcontrols2-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 qtquickcontrols2-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}.
+
+    \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 qtquickcontrols2-tabbar-explicit.png
+
+    \snippet qtquickcontrols2-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 qtquickcontrols2-tabbar-flickable.png
+
+    \snippet qtquickcontrols2-tabbar-flickable.qml 1
+
+    \sa TabButton, {Customizing TabBar}, {Navigation Controls}, {Container Controls}
+*/
+
+class QQuickTabBarPrivate : public QQuickContainerPrivate
+{
+    Q_DECLARE_PUBLIC(QQuickTabBar)
+
+public:
+    QQuickTabBarPrivate();
+
+    void updateCurrentItem();
+    void updateCurrentIndex();
+    void updateLayout();
+
+    void itemGeometryChanged(QQuickItem *item, const QRectF &newGeometry, const QRectF &oldGeometry) override;
+
+    bool updatingLayout;
+    QQuickTabBar::Position position;
+};
+
+QQuickTabBarPrivate::QQuickTabBarPrivate() : updatingLayout(false), position(QQuickTabBar::Header)
+{
+    changeTypes |= Geometry;
+}
+
+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) {
+        qreal reservedWidth = 0;
+        QVector<QQuickItem *> resizableItems;
+        resizableItems.reserve(count);
+
+        for (int i = 0; i < count; ++i) {
+            QQuickItem *item = q->itemAt(i);
+            if (item) {
+                QQuickItemPrivate *p = QQuickItemPrivate::get(item);
+                if (!p->widthValid)
+                    resizableItems += item;
+                else
+                    reservedWidth += item->width();
+            }
+        }
+
+        if (!resizableItems.isEmpty()) {
+            const qreal totalSpacing = qMax(0, count - 1) * spacing;
+            const qreal itemWidth = (contentItem->width() - reservedWidth - totalSpacing) / resizableItems.count();
+
+            updatingLayout = true;
+            for (QQuickItem *item : qAsConst(resizableItems)) {
+                item->setWidth(itemWidth);
+                QQuickItemPrivate::get(item)->widthValid = false;
+            }
+            updatingLayout = false;
+        }
+    }
+}
+
+void QQuickTabBarPrivate::itemGeometryChanged(QQuickItem *, const QRectF &, const QRectF &)
+{
+    if (!updatingLayout)
+        updateLayout();
+}
+
+QQuickTabBar::QQuickTabBar(QQuickItem *parent) :
+    QQuickContainer(*(new QQuickTabBarPrivate), parent)
+{
+    Q_D(QQuickTabBar);
+    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();
+}
+
+void QQuickTabBar::updatePolish()
+{
+    Q_D(QQuickTabBar);
+    QQuickContainer::updatePolish();
+    d->updateLayout();
+}
+
+void QQuickTabBar::componentComplete()
+{
+    Q_D(QQuickTabBar);
+    QQuickContainer::componentComplete();
+    d->updateCurrentItem();
+    d->updateLayout();
+}
+
+void QQuickTabBar::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
+{
+    Q_D(QQuickTabBar);
+    QQuickContainer::geometryChanged(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);
+    if (isComponentComplete())
+        polish();
+}
+
+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);
+    if (isComponentComplete())
+        polish();
+}
+
+#ifndef QT_NO_ACCESSIBILITY
+QAccessible::Role QQuickTabBar::accessibleRole() const
+{
+    return QAccessible::PageTabList;
+}
+#endif
+
+QT_END_NAMESPACE