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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Quick Controls 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 "qquickcontainer_p_p.h"
#include "qquickexclusivegroup_p.h"
QT_BEGIN_NAMESPACE
/*!
\qmltype TabBar
\inherits Container
\instantiates QQuickTabBar
\inqmlmodule QtQuick.Controls
\ingroup tabs
\brief A tab bar control.
TabBar provides a tab-based navigation model. 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
### TODO: screenshot
\code
ApplicationWindow {
visible:true
header: TabBar {
id: bar
TabButton {
text: qsTr("Home")
}
TabButton {
text: qsTr("Discover")
}
TabButton {
text: qsTr("Activity")
}
}
StackLayout {
anchors.fill: parent
currentIndex: bar.currentIndex
Item {
id: homeTab
}
Item {
id: discoverTab
}
Item {
id: activityTab
}
}
}
\endcode
\sa TabButton, {Customizing TabBar}
*/
class QQuickTabBarPrivate : public QQuickContainerPrivate
{
Q_DECLARE_PUBLIC(QQuickTabBar)
public:
QQuickTabBarPrivate() : currentIndex(0), group(Q_NULLPTR) { }
void updateLayout();
void updateCurrent();
void insertItem(int index, QQuickItem *item) Q_DECL_OVERRIDE;
void moveItem(int from, int to) Q_DECL_OVERRIDE;
void removeItem(int index, QQuickItem *item) Q_DECL_OVERRIDE;
int currentIndex;
QQuickExclusiveGroup *group;
};
void QQuickTabBarPrivate::updateLayout()
{
Q_Q(QQuickTabBar);
const int count = contentModel->count();
if (count > 0 && contentItem) {
const qreal spacing = contentItem->property("spacing").toReal();
const qreal itemWidth = (contentItem->width() - qMax(0, count - 1) * spacing) / count;
for (int i = 0; i < count; ++i) {
QQuickItem *item = q->itemAt(i);
if (item) {
QQuickItemPrivate *p = QQuickItemPrivate::get(item);
if (!p->widthValid) {
item->setWidth(itemWidth);
p->widthValid = false;
}
}
}
}
}
void QQuickTabBarPrivate::updateCurrent()
{
Q_Q(QQuickTabBar);
q->setCurrentIndex(contentModel->indexOf(group->current(), Q_NULLPTR));
}
void QQuickTabBarPrivate::insertItem(int index, QQuickItem *item)
{
QQuickContainerPrivate::insertItem(index, item);
group->addCheckable(item);
if (contentModel->count() == 1 || currentIndex == index)
group->setCurrent(item);
else
updateCurrent();
}
void QQuickTabBarPrivate::moveItem(int from, int to)
{
QQuickContainerPrivate::moveItem(from, to);
updateCurrent();
}
void QQuickTabBarPrivate::removeItem(int index, QQuickItem *item)
{
Q_Q(QQuickTabBar);
bool currentChanged = false;
if (index == currentIndex) {
group->setCurrent(contentModel->get(index - 1));
} else if (index < currentIndex) {
--currentIndex;
currentChanged = true;
}
group->removeCheckable(item);
QQuickContainerPrivate::removeItem(index, item);
if (currentChanged)
emit q->currentIndexChanged();
}
QQuickTabBar::QQuickTabBar(QQuickItem *parent) :
QQuickContainer(*(new QQuickTabBarPrivate), parent)
{
Q_D(QQuickTabBar);
setFlag(ItemIsFocusScope);
setActiveFocusOnTab(true);
d->group = new QQuickExclusiveGroup(this);
connect(d->group, &QQuickExclusiveGroup::currentChanged, this, &QQuickTabBar::currentItemChanged);
QObjectPrivate::connect(d->group, &QQuickExclusiveGroup::currentChanged, d, &QQuickTabBarPrivate::updateCurrent);
}
/*!
\qmlproperty int QtQuickControls2::TabBar::currentIndex
This property holds the current index.
*/
int QQuickTabBar::currentIndex() const
{
Q_D(const QQuickTabBar);
return d->currentIndex;
}
void QQuickTabBar::setCurrentIndex(int index)
{
Q_D(QQuickTabBar);
if (d->currentIndex != index) {
d->currentIndex = index;
emit currentIndexChanged();
if (isComponentComplete())
d->group->setCurrent(d->contentModel->get(index));
}
}
/*!
\qmlproperty Item QtQuickControls2::TabBar::currentItem
\readonly
This property holds the current item.
*/
QQuickItem *QQuickTabBar::currentItem() const
{
Q_D(const QQuickTabBar);
return qobject_cast<QQuickItem *>(d->group->current());
}
void QQuickTabBar::updatePolish()
{
Q_D(QQuickTabBar);
QQuickContainer::updatePolish();
d->updateLayout();
}
void QQuickTabBar::componentComplete()
{
Q_D(QQuickTabBar);
QQuickContainer::componentComplete();
d->updateCurrent();
d->updateLayout();
}
void QQuickTabBar::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
{
Q_D(QQuickTabBar);
QQuickContainer::geometryChanged(newGeometry, oldGeometry);
d->updateLayout();
}
QT_END_NAMESPACE
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