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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 A bar with icons allowing 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
\section2 Flickable 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. 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, QQuickGeometryChange change, const QRectF &diff) 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 *, QQuickGeometryChange, 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 ApplicationWindow
or 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
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