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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qtabwidget.h"
+
+#ifndef QT_NO_TABWIDGET
+#include "private/qwidget_p.h"
+#include "private/qtabbar_p.h"
+#include "qapplication.h"
+#include "qbitmap.h"
+#include "qdesktopwidget.h"
+#include "qevent.h"
+#include "qlayout.h"
+#include "qstackedwidget.h"
+#include "qstyle.h"
+#include "qstyleoption.h"
+#include "qstylepainter.h"
+#include "qtabbar.h"
+#include "qtoolbutton.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QTabWidget
+    \brief The QTabWidget class provides a stack of tabbed widgets.
+
+    \ingroup organizers
+    \ingroup basicwidgets
+    \mainclass
+
+    A tab widget provides a tab bar (see QTabBar) and a "page area"
+    that is used to display pages related to each tab. By default, the
+    tab bar is shown above the page area, but different configurations
+    are available (see \l{TabPosition}). Each tab is associated with a
+    different widget (called a page). Only the current page is shown in
+    the page area; all the other pages are hidden. The user can show a
+    different page by clicking on its tab or by pressing its
+    Alt+\e{letter} shortcut if it has one.
+
+    The normal way to use QTabWidget is to do the following:
+    \list 1
+    \i Create a QTabWidget.
+    \i Create a QWidget for each of the pages in the tab dialog, but
+       do not specify parent widgets for them.
+    \i Insert child widgets into the page widget, using layouts to
+       position them as normal.
+    \i Call addTab() or insertTab() to put the page widgets into the
+       tab widget, giving each tab a suitable label with an optional
+       keyboard shortcut.
+    \endlist
+
+    The position of the tabs is defined by \l tabPosition, their shape
+    by \l tabShape.
+
+    The signal currentChanged() is emitted when the user selects a
+    page.
+
+    The current page index is available as currentIndex(), the current
+    page widget with currentWidget().  You can retrieve a pointer to a
+    page widget with a given index using widget(), and can find the
+    index position of a widget with indexOf(). Use setCurrentWidget()
+    or setCurrentIndex() to show a particular page.
+
+    You can change a tab's text and icon using setTabText() or
+    setTabIcon(). A tab and its associated page can be removed with
+    removeTab().
+
+    Each tab is either enabled or disabled at any given time (see
+    setTabEnabled()). If a tab is enabled, the tab text is drawn
+    normally and the user can select that tab. If it is disabled, the
+    tab is drawn in a different way and the user cannot select that
+    tab. Note that even if a tab is disabled, the page can still be
+    visible, for example if all of the tabs happen to be disabled.
+
+    Tab widgets can be a very good way to split up a complex dialog.
+    An alternative is to use a QStackedWidget for which you provide some
+    means of navigating between pages, for example, a QToolBar or a
+    QListWidget.
+
+    Most of the functionality in QTabWidget is provided by a QTabBar
+    (at the top, providing the tabs) and a QStackedWidget (most of the
+    area, organizing the individual pages).
+
+    \table 100%
+    \row \o \inlineimage windowsxp-tabwidget.png Screenshot of a Windows XP style tab widget
+         \o \inlineimage macintosh-tabwidget.png Screenshot of a Macintosh style tab widget
+         \o \inlineimage plastique-tabwidget.png Screenshot of a Plastique style tab widget
+    \row \o A Windows XP style tab widget.
+         \o A Macintosh style tab widget.
+         \o A Plastique style tab widget.
+    \endtable
+
+    \sa QTabBar, QStackedWidget, QToolBox, {Tab Dialog Example}
+*/
+
+/*!
+    \enum QTabWidget::TabPosition
+
+    This enum type defines where QTabWidget draws the tab row:
+
+    \value North  The tabs are drawn above the pages.
+    \value South  The tabs are drawn below the pages.
+    \value West  The tabs are drawn to the left of the pages.
+    \value East  The tabs are drawn to the right of the pages.
+    \omitvalue Bottom
+    \omitvalue Top
+*/
+
+/*!
+    \enum QTabWidget::TabShape
+
+    This enum type defines the shape of the tabs:
+    \value Rounded  The tabs are drawn with a rounded look. This is the default
+                    shape.
+    \value Triangular  The tabs are drawn with a triangular look.
+*/
+
+/*!
+    \fn void QTabWidget::selected(const QString &tabLabel)
+
+    This signal is emitted whenever a tab is selected (raised),
+    including during the first show().
+
+    You can normally use currentChanged() instead.
+*/
+
+/*!
+    \fn void QTabWidget::currentChanged(int index)
+
+    This signal is emitted whenever the current page index changes.
+    The parameter is the new current page \a index position, or -1
+    if there isn't a new one (for example, if there are no widgets
+    in the QTabWidget)
+
+    \sa currentWidget() currentIndex
+*/
+
+/*!
+    \fn void QTabWidget::tabCloseRequested(int index)
+    \since 4.5
+
+    This signal is emitted when the close button on a tab is clicked.
+    The \a index is the index that should be removed.
+
+    \sa setTabsClosable()
+*/
+
+class QTabWidgetPrivate : public QWidgetPrivate
+{
+    Q_DECLARE_PUBLIC(QTabWidget)
+
+public:
+    QTabWidgetPrivate();
+    ~QTabWidgetPrivate();
+    void updateTabBarPosition();
+    void _q_showTab(int);
+    void _q_removeTab(int);
+    void _q_tabMoved(int from, int to);
+    void init();
+
+    QTabBar *tabs;
+    QStackedWidget *stack;
+    QRect panelRect;
+    bool dirty;
+    QTabWidget::TabPosition pos;
+    QTabWidget::TabShape shape;
+    int alignment;
+    QWidget *leftCornerWidget;
+    QWidget *rightCornerWidget;
+};
+
+QTabWidgetPrivate::QTabWidgetPrivate()
+    : tabs(0), stack(0), dirty(true),
+      pos(QTabWidget::North), shape(QTabWidget::Rounded),
+      leftCornerWidget(0), rightCornerWidget(0)
+{}
+
+QTabWidgetPrivate::~QTabWidgetPrivate()
+{}
+
+void QTabWidgetPrivate::init()
+{
+    Q_Q(QTabWidget);
+
+    stack = new QStackedWidget(q);
+    stack->setObjectName(QLatin1String("qt_tabwidget_stackedwidget"));
+    stack->setLineWidth(0);
+    // hack so that QMacStyle::layoutSpacing() can detect tab widget pages
+    stack->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred, QSizePolicy::TabWidget));
+
+    QObject::connect(stack, SIGNAL(widgetRemoved(int)), q, SLOT(_q_removeTab(int)));
+    QTabBar *tabBar = new QTabBar(q);
+    tabBar->setObjectName(QLatin1String("qt_tabwidget_tabbar"));
+    tabBar->setDrawBase(false);
+    q->setTabBar(tabBar);
+
+    q->setSizePolicy(QSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding,
+                                 QSizePolicy::TabWidget));
+#ifdef QT_KEYPAD_NAVIGATION
+    if (QApplication::keypadNavigationEnabled())
+        q->setFocusPolicy(Qt::NoFocus);
+    else
+#endif
+    q->setFocusPolicy(Qt::TabFocus);
+    q->setFocusProxy(tabs);
+    q->setTabPosition(static_cast<QTabWidget::TabPosition> (q->style()->styleHint(
+                      QStyle::SH_TabWidget_DefaultTabPosition, 0, q )));
+
+}
+
+/*!
+    Initialize \a option with the values from this QTabWidget. This method is useful
+    for subclasses when they need a QStyleOptionTabWidgetFrame, but don't want to fill
+    in all the information themselves.
+
+    \sa QStyleOption::initFrom() QTabBar::initStyleOption()
+*/
+void QTabWidget::initStyleOption(QStyleOptionTabWidgetFrame *option) const
+{
+    if (!option)
+        return;
+
+    Q_D(const QTabWidget);
+    option->initFrom(this);
+
+    if (documentMode())
+        option->lineWidth = 0;
+    else
+        option->lineWidth = style()->pixelMetric(QStyle::PM_DefaultFrameWidth, 0, this);
+
+    int exth = style()->pixelMetric(QStyle::PM_TabBarBaseHeight, 0, this);
+    QSize t(0, d->stack->frameWidth());
+    if (d->tabs->isVisibleTo(const_cast<QTabWidget *>(this))) {
+        t = d->tabs->sizeHint();
+        if (documentMode()) {
+            if (tabPosition() == East || tabPosition() == West) {
+                t.setHeight(height());
+            } else {
+                t.setWidth(width());
+            }
+        }
+    }
+
+    if (d->rightCornerWidget) {
+        const QSize rightCornerSizeHint = d->rightCornerWidget->sizeHint();
+        const QSize bounds(rightCornerSizeHint.width(), t.height() - exth);
+        option->rightCornerWidgetSize = rightCornerSizeHint.boundedTo(bounds);
+    } else {
+        option->rightCornerWidgetSize = QSize(0, 0);
+    }
+
+    if (d->leftCornerWidget) {
+        const QSize leftCornerSizeHint = d->leftCornerWidget->sizeHint();
+        const QSize bounds(leftCornerSizeHint.width(), t.height() - exth);
+        option->leftCornerWidgetSize = leftCornerSizeHint.boundedTo(bounds);
+    } else {
+        option->leftCornerWidgetSize = QSize(0, 0);
+    }
+
+    switch (d->pos) {
+    case QTabWidget::North:
+        option->shape = d->shape == QTabWidget::Rounded ? QTabBar::RoundedNorth
+                                                        : QTabBar::TriangularNorth;
+        break;
+    case QTabWidget::South:
+        option->shape = d->shape == QTabWidget::Rounded ? QTabBar::RoundedSouth
+                                                        : QTabBar::TriangularSouth;
+        break;
+    case QTabWidget::West:
+        option->shape = d->shape == QTabWidget::Rounded ? QTabBar::RoundedWest
+                                                        : QTabBar::TriangularWest;
+        break;
+    case QTabWidget::East:
+        option->shape = d->shape == QTabWidget::Rounded ? QTabBar::RoundedEast
+                                                        : QTabBar::TriangularEast;
+        break;
+    }
+    option->tabBarSize = t;
+}
+
+/*!
+    Constructs a tabbed widget with parent \a parent.
+*/
+QTabWidget::QTabWidget(QWidget *parent)
+    : QWidget(*new QTabWidgetPrivate, parent, 0)
+{
+    Q_D(QTabWidget);
+    d->init();
+}
+
+#ifdef QT3_SUPPORT
+/*!
+    Use one of the constructors that doesn't take the \a name
+    argument and then use setObjectName() instead.
+*/
+QTabWidget::QTabWidget(QWidget *parent, const char *name, Qt::WindowFlags f)
+    : QWidget(*new QTabWidgetPrivate, parent, f)
+{
+    Q_D(QTabWidget);
+    setObjectName(QString::fromAscii(name));
+    d->init();
+}
+#endif
+
+/*!
+    Destroys the tabbed widget.
+*/
+QTabWidget::~QTabWidget()
+{
+}
+
+/*!
+    \fn int QTabWidget::addTab(QWidget *page, const QString &label)
+
+    Adds a tab with the given \a page and \a label to the tab widget,
+    and returns the index of the tab in the tab bar.
+
+    If the tab's \a label contains an ampersand, the letter following
+    the ampersand is used as a shortcut for the tab, e.g. if the
+    label is "Bro\&wse" then Alt+W becomes a shortcut which will
+    move the focus to this tab.
+
+    \note If you call addTab() after show(), the layout system will try
+    to adjust to the changes in its widgets hierarchy and may cause
+    flicker. To prevent this, you can set the QWidget::updatesEnabled
+    property to false prior to changes; remember to set the property
+    to true when the changes are done, making the widget receive paint
+    events again.
+
+    \sa insertTab()
+*/
+int QTabWidget::addTab(QWidget *child, const QString &label)
+{
+    return insertTab(-1, child, label);
+}
+
+
+/*!
+    \fn int QTabWidget::addTab(QWidget *page, const QIcon &icon, const QString &label)
+    \overload
+
+    Adds a tab with the given \a page, \a icon, and \a label to the tab
+    widget, and returns the index of the tab in the tab bar.
+
+    This function is the same as addTab(), but with an additional \a
+    icon.
+*/
+int QTabWidget::addTab(QWidget *child, const QIcon& icon, const QString &label)
+{
+    return insertTab(-1, child, icon, label);
+}
+
+
+/*!
+    \fn int QTabWidget::insertTab(int index, QWidget *page, const QString &label)
+
+    Inserts a tab with the given \a label and \a page into the tab
+    widget at the specified \a index, and returns the index of the
+    inserted tab in the tab bar.
+
+    The label is displayed in the tab and may vary in appearance depending
+    on the configuration of the tab widget.
+
+    If the tab's \a label contains an ampersand, the letter following
+    the ampersand is used as a shortcut for the tab, e.g. if the
+    label is "Bro\&wse" then Alt+W becomes a shortcut which will
+    move the focus to this tab.
+
+    If \a index is out of range, the tab is simply appended.
+    Otherwise it is inserted at the specified position.
+
+    If the QTabWidget was empty before this function is called, the
+    new page becomes the current page. Inserting a new tab at an index
+    less than or equal to the current index will increment the current
+    index, but keep the current page.
+
+    \note If you call insertTab() after show(), the layout system will try
+    to adjust to the changes in its widgets hierarchy and may cause
+    flicker. To prevent this, you can set the QWidget::updatesEnabled
+    property to false prior to changes; remember to set the property
+    to true when the changes are done, making the widget receive paint
+    events again.
+
+    \sa addTab()
+*/
+int QTabWidget::insertTab(int index, QWidget *w, const QString &label)
+{
+    return insertTab(index, w, QIcon(), label);
+}
+
+
+/*!
+    \fn int QTabWidget::insertTab(int index, QWidget *page, const QIcon& icon, const QString &label)
+    \overload
+
+    Inserts a tab with the given \a label, \a page, and \a icon into
+    the tab widget at the specified \a index, and returns the index of the
+    inserted tab in the tab bar.
+
+    This function is the same as insertTab(), but with an additional
+    \a icon.
+*/
+int QTabWidget::insertTab(int index, QWidget *w, const QIcon& icon, const QString &label)
+{
+    Q_D(QTabWidget);
+    if(!w)
+        return -1;
+    index = d->stack->insertWidget(index, w);
+    d->tabs->insertTab(index, icon, label);
+    setUpLayout();
+    tabInserted(index);
+
+    return index;
+}
+
+
+/*!
+    Defines a new \a label for the page at position \a index's tab.
+
+    If the provided text contains an ampersand character ('&'), a
+    shortcut is automatically created for it. The character that
+    follows the '&' will be used as the shortcut key. Any previous
+    shortcut will be overwritten, or cleared if no shortcut is defined
+    by the text. See the \l {QShortcut#mnemonic}{QShortcut}
+    documentation for details (to display an actual ampersand, use
+    '&&').
+
+*/
+void QTabWidget::setTabText(int index, const QString &label)
+{
+    Q_D(QTabWidget);
+    d->tabs->setTabText(index, label);
+    setUpLayout();
+}
+
+/*!
+    Returns the label text for the tab on the page at position \a index.
+*/
+
+QString QTabWidget::tabText(int index) const
+{
+    Q_D(const QTabWidget);
+    return d->tabs->tabText(index);
+}
+
+/*!
+    \overload
+
+    Sets the \a icon for the tab at position \a index.
+*/
+void QTabWidget::setTabIcon(int index, const QIcon &icon)
+{
+    Q_D(QTabWidget);
+    d->tabs->setTabIcon(index, icon);
+    setUpLayout();
+}
+
+/*!
+    Returns the icon for the tab on the page at position \a index.
+*/
+
+QIcon QTabWidget::tabIcon(int index) const
+{
+    Q_D(const QTabWidget);
+    return d->tabs->tabIcon(index);
+}
+
+/*!
+    Returns true if the the page at position \a index is enabled; otherwise returns false.
+
+    \sa setTabEnabled(), QWidget::isEnabled()
+*/
+
+bool QTabWidget::isTabEnabled(int index) const
+{
+    Q_D(const QTabWidget);
+    return d->tabs->isTabEnabled(index);
+}
+
+/*!
+    If \a enable is true, the page at position \a index is enabled; otherwise the page at position \a index is
+    disabled. The page's tab is redrawn appropriately.
+
+    QTabWidget uses QWidget::setEnabled() internally, rather than
+    keeping a separate flag.
+
+    Note that even a disabled tab/page may be visible. If the page is
+    visible already, QTabWidget will not hide it; if all the pages are
+    disabled, QTabWidget will show one of them.
+
+    \sa isTabEnabled(), QWidget::setEnabled()
+*/
+
+void QTabWidget::setTabEnabled(int index, bool enable)
+{
+    Q_D(QTabWidget);
+    d->tabs->setTabEnabled(index, enable);
+}
+
+/*!
+  \fn void QTabWidget::setCornerWidget(QWidget *widget, Qt::Corner corner)
+
+  Sets the given \a widget to be shown in the specified \a corner of the
+  tab widget. The geometry of the widget is determined based on the widget's
+  sizeHint() and the style().
+
+  Only the horizontal element of the \a corner will be used.
+
+  Passing 0 shows no widget in the corner.
+
+  Any previously set corner widget is hidden.
+
+  All widgets set here will be deleted by the tab widget when it is
+  destroyed unless you separately reparent the widget after setting
+  some other corner widget (or 0).
+
+  Note: Corner widgets are designed for \l North and \l South tab positions;
+  other orientations are known to not work properly.
+
+  \sa cornerWidget(), setTabPosition()
+*/
+void QTabWidget::setCornerWidget(QWidget * widget, Qt::Corner corner)
+{
+    Q_D(QTabWidget);
+    if (widget && widget->parentWidget() != this)
+        widget->setParent(this);
+
+    if (corner & Qt::TopRightCorner) {
+        if (d->rightCornerWidget)
+            d->rightCornerWidget->hide();
+        d->rightCornerWidget = widget;
+    } else {
+        if (d->leftCornerWidget)
+            d->leftCornerWidget->hide();
+        d->leftCornerWidget = widget;
+    }
+    setUpLayout();
+}
+
+/*!
+    Returns the widget shown in the \a corner of the tab widget or 0.
+*/
+QWidget * QTabWidget::cornerWidget(Qt::Corner corner) const
+{
+    Q_D(const QTabWidget);
+    if (corner & Qt::TopRightCorner)
+        return d->rightCornerWidget;
+    return d->leftCornerWidget;
+}
+
+/*!
+   Removes the tab at position \a index from this stack of widgets.
+   The page widget itself is not deleted.
+
+   \sa addTab(), insertTab()
+*/
+void QTabWidget::removeTab(int index)
+{
+    Q_D(QTabWidget);
+    if (QWidget *w = d->stack->widget(index))
+        d->stack->removeWidget(w);
+}
+
+/*!
+    Returns a pointer to the page currently being displayed by the tab
+    dialog. The tab dialog does its best to make sure that this value
+    is never 0 (but if you try hard enough, it can be).
+
+    \sa currentIndex(), setCurrentWidget()
+*/
+
+QWidget * QTabWidget::currentWidget() const
+{
+    Q_D(const QTabWidget);
+    return d->stack->currentWidget();
+}
+
+/*!
+    Makes \a widget the current widget. The \a widget used must be a page in
+    this tab widget.
+
+    \sa addTab(), setCurrentIndex(), currentWidget()
+ */
+void QTabWidget::setCurrentWidget(QWidget *widget)
+{
+    Q_D(const QTabWidget);
+    d->tabs->setCurrentIndex(indexOf(widget));
+}
+
+
+/*!
+    \property QTabWidget::currentIndex
+    \brief the index position of the current tab page
+
+    The current index is -1 if there is no current widget.
+
+    By default, this property contains a value of -1 because there are initially
+    no tabs in the widget.
+*/
+
+int QTabWidget::currentIndex() const
+{
+    Q_D(const QTabWidget);
+    return d->tabs->currentIndex();
+}
+
+void QTabWidget::setCurrentIndex(int index)
+{
+    Q_D(QTabWidget);
+    d->tabs->setCurrentIndex(index);
+}
+
+
+/*!
+    Returns the index position of the page occupied by the widget \a
+    w, or -1 if the widget cannot be found.
+*/
+int QTabWidget::indexOf(QWidget* w) const
+{
+    Q_D(const QTabWidget);
+    return d->stack->indexOf(w);
+}
+
+
+/*!
+    \reimp
+*/
+void QTabWidget::resizeEvent(QResizeEvent *e)
+{
+    QWidget::resizeEvent(e);
+    setUpLayout();
+}
+
+/*!
+    Replaces the dialog's QTabBar heading with the tab bar \a tb. Note
+    that this must be called \e before any tabs have been added, or
+    the behavior is undefined.
+
+    \sa tabBar()
+*/
+void QTabWidget::setTabBar(QTabBar* tb)
+{
+    Q_D(QTabWidget);
+    Q_ASSERT(tb);
+
+    if (tb->parentWidget() != this) {
+        tb->setParent(this);
+        tb->show();
+    }
+    delete d->tabs;
+    d->tabs = tb;
+    setFocusProxy(d->tabs);
+    connect(d->tabs, SIGNAL(currentChanged(int)),
+            this, SLOT(_q_showTab(int)));
+    connect(d->tabs, SIGNAL(tabMoved(int, int)),
+            this, SLOT(_q_tabMoved(int, int)));
+    if (d->tabs->tabsClosable())
+        connect(d->tabs, SIGNAL(tabCloseRequested(int)),
+                this, SIGNAL(tabCloseRequested(int)));
+    tb->setExpanding(!documentMode());
+    setUpLayout();
+}
+
+
+/*!
+    Returns the current QTabBar.
+
+    \sa setTabBar()
+*/
+QTabBar* QTabWidget::tabBar() const
+{
+    Q_D(const QTabWidget);
+    return d->tabs;
+}
+
+/*!
+    Ensures that the selected tab's page is visible and appropriately
+    sized.
+*/
+
+void QTabWidgetPrivate::_q_showTab(int index)
+{
+    Q_Q(QTabWidget);
+    if (index < stack->count() && index >= 0)
+        stack->setCurrentIndex(index);
+    emit q->currentChanged(index);
+#ifdef QT3_SUPPORT
+    emit q->selected(q->tabText(index));
+    emit q->currentChanged(stack->widget(index));
+#endif
+}
+
+void QTabWidgetPrivate::_q_removeTab(int index)
+{
+    Q_Q(QTabWidget);
+    tabs->removeTab(index);
+    q->setUpLayout();
+    q->tabRemoved(index);
+}
+
+void QTabWidgetPrivate::_q_tabMoved(int from, int to)
+{
+    stack->blockSignals(true);
+    QWidget *w = stack->widget(from);
+    stack->removeWidget(w);
+    stack->insertWidget(to, w);
+    stack->blockSignals(false);
+}
+
+/*
+    Set up the layout.
+    Get subrect from the current style, and set the geometry for the
+    stack widget, tab bar and corner widgets.
+*/
+void QTabWidget::setUpLayout(bool onlyCheck)
+{
+    Q_D(QTabWidget);
+    if (onlyCheck && !d->dirty)
+        return; // nothing to do
+
+    QStyleOptionTabWidgetFrame option;
+    initStyleOption(&option);
+
+    // this must be done immediately, because QWidgetItem relies on it (even if !isVisible())
+    d->setLayoutItemMargins(QStyle::SE_TabWidgetLayoutItem, &option);
+
+    if (!isVisible()) {
+        d->dirty = true;
+        return; // we'll do it later
+    }
+
+    QRect tabRect = style()->subElementRect(QStyle::SE_TabWidgetTabBar, &option, this);
+    d->panelRect = style()->subElementRect(QStyle::SE_TabWidgetTabPane, &option, this);
+    QRect contentsRect = style()->subElementRect(QStyle::SE_TabWidgetTabContents, &option, this);
+    QRect leftCornerRect = style()->subElementRect(QStyle::SE_TabWidgetLeftCorner, &option, this);
+    QRect rightCornerRect = style()->subElementRect(QStyle::SE_TabWidgetRightCorner, &option, this);
+
+    d->tabs->setGeometry(tabRect);
+    d->stack->setGeometry(contentsRect);
+    if (d->leftCornerWidget)
+        d->leftCornerWidget->setGeometry(leftCornerRect);
+    if (d->rightCornerWidget)
+        d->rightCornerWidget->setGeometry(rightCornerRect);
+
+    if (!onlyCheck)
+        update();
+    updateGeometry();
+}
+
+/*!
+    \internal
+*/
+static inline QSize basicSize(
+    bool horizontal, const QSize &lc, const QSize &rc, const QSize &s, const QSize &t)
+{
+    return horizontal
+        ? QSize(qMax(s.width(), t.width() + rc.width() + lc.width()),
+                s.height() + (qMax(rc.height(), qMax(lc.height(), t.height()))))
+        : QSize(s.width() + (qMax(rc.width(), qMax(lc.width(), t.width()))),
+                qMax(s.height(), t.height() + rc.height() + lc.height()));
+}
+
+/*!
+    \reimp
+*/
+QSize QTabWidget::sizeHint() const
+{
+    Q_D(const QTabWidget);
+    QSize lc(0, 0), rc(0, 0);
+    QStyleOption opt(0);
+    opt.init(this);
+    opt.state = QStyle::State_None;
+
+    if (d->leftCornerWidget)
+        lc = d->leftCornerWidget->sizeHint();
+    if(d->rightCornerWidget)
+        rc = d->rightCornerWidget->sizeHint();
+    if (!d->dirty) {
+        QTabWidget *that = (QTabWidget*)this;
+        that->setUpLayout(true);
+    }
+    QSize s(d->stack->sizeHint());
+    QSize t(d->tabs->sizeHint());
+    if(usesScrollButtons())
+        t = t.boundedTo(QSize(200,200));
+    else
+        t = t.boundedTo(QApplication::desktop()->size());
+
+    QSize sz = basicSize(d->pos == North || d->pos == South, lc, rc, s, t);
+
+    return style()->sizeFromContents(QStyle::CT_TabWidget, &opt, sz, this)
+                    .expandedTo(QApplication::globalStrut());
+}
+
+
+/*!
+    \reimp
+
+    Returns a suitable minimum size for the tab widget.
+*/
+QSize QTabWidget::minimumSizeHint() const
+{
+    Q_D(const QTabWidget);
+    QSize lc(0, 0), rc(0, 0);
+
+    if(d->leftCornerWidget)
+        lc = d->leftCornerWidget->minimumSizeHint();
+    if(d->rightCornerWidget)
+        rc = d->rightCornerWidget->minimumSizeHint();
+    if (!d->dirty) {
+        QTabWidget *that = (QTabWidget*)this;
+        that->setUpLayout(true);
+    }
+    QSize s(d->stack->minimumSizeHint());
+    QSize t(d->tabs->minimumSizeHint());
+
+    QSize sz = basicSize(d->pos == North || d->pos == South, lc, rc, s, t);
+
+    QStyleOption opt(0);
+    opt.rect = rect();
+    opt.palette = palette();
+    opt.state = QStyle::State_None;
+    return style()->sizeFromContents(QStyle::CT_TabWidget, &opt, sz, this)
+                    .expandedTo(QApplication::globalStrut());
+}
+
+/*!
+    \reimp
+ */
+void QTabWidget::showEvent(QShowEvent *)
+{
+    setUpLayout();
+}
+
+void QTabWidgetPrivate::updateTabBarPosition()
+{
+    Q_Q(QTabWidget);
+    switch (pos) {
+    case QTabWidget::North:
+        tabs->setShape(shape == QTabWidget::Rounded ? QTabBar::RoundedNorth
+                                                    : QTabBar::TriangularNorth);
+        break;
+    case QTabWidget::South:
+        tabs->setShape(shape == QTabWidget::Rounded ? QTabBar::RoundedSouth
+                                                    : QTabBar::TriangularSouth);
+        break;
+    case QTabWidget::West:
+        tabs->setShape(shape == QTabWidget::Rounded ? QTabBar::RoundedWest
+                                                    : QTabBar::TriangularWest);
+        break;
+    case QTabWidget::East:
+        tabs->setShape(shape == QTabWidget::Rounded ? QTabBar::RoundedEast
+                                                    : QTabBar::TriangularEast);
+        break;
+    }
+    q->setUpLayout();
+}
+
+/*!
+    \property QTabWidget::tabPosition
+    \brief the position of the tabs in this tab widget
+
+    Possible values for this property are described by the TabPosition
+    enum.
+
+    By default, this property is set to \l North.
+
+    \sa TabPosition
+*/
+QTabWidget::TabPosition QTabWidget::tabPosition() const
+{
+    Q_D(const QTabWidget);
+    return d->pos;
+}
+
+void QTabWidget::setTabPosition(TabPosition pos)
+{
+    Q_D(QTabWidget);
+    if (d->pos == pos)
+        return;
+    d->pos = pos;
+    d->updateTabBarPosition();
+}
+
+/*!
+    \property QTabWidget::tabsClosable
+    \brief whether close buttons are automatically added to each tab.
+
+    \since 4.5
+
+    \sa QTabBar::tabsClosable()
+*/
+bool QTabWidget::tabsClosable() const
+{
+    return tabBar()->tabsClosable();
+}
+
+void QTabWidget::setTabsClosable(bool closeable)
+{
+    if (tabsClosable() == closeable)
+        return;
+
+    tabBar()->setTabsClosable(closeable);
+    if (closeable)
+        connect(tabBar(), SIGNAL(tabCloseRequested(int)),
+                this, SIGNAL(tabCloseRequested(int)));
+    else
+        disconnect(tabBar(), SIGNAL(tabCloseRequested(int)),
+                  this, SIGNAL(tabCloseRequested(int)));
+    setUpLayout();
+}
+
+/*!
+    \property QTabWidget::movable
+    \brief This property holds whether the user can move the tabs
+    within the tabbar area.
+
+    \since 4.5
+
+    By default, this property is false;
+*/
+
+bool QTabWidget::isMovable() const
+{
+    return tabBar()->isMovable();
+}
+
+void QTabWidget::setMovable(bool movable)
+{
+    tabBar()->setMovable(movable);
+}
+
+/*!
+    \property QTabWidget::tabShape
+    \brief the shape of the tabs in this tab widget
+
+    Possible values for this property are QTabWidget::Rounded
+    (default) or QTabWidget::Triangular.
+
+    \sa TabShape
+*/
+
+QTabWidget::TabShape QTabWidget::tabShape() const
+{
+    Q_D(const QTabWidget);
+    return d->shape;
+}
+
+void QTabWidget::setTabShape(TabShape s)
+{
+    Q_D(QTabWidget);
+    if (d->shape == s)
+        return;
+    d->shape = s;
+    d->updateTabBarPosition();
+}
+
+/*!
+    \reimp
+ */
+bool QTabWidget::event(QEvent *ev)
+{
+    if (ev->type() == QEvent::LayoutRequest)
+        setUpLayout();
+    return QWidget::event(ev);
+}
+
+/*!
+    \reimp
+ */
+void QTabWidget::changeEvent(QEvent *ev)
+{
+    if (ev->type() == QEvent::StyleChange
+#ifdef Q_WS_MAC
+            || ev->type() == QEvent::MacSizeChange
+#endif
+            )
+        setUpLayout();
+    QWidget::changeEvent(ev);
+}
+
+
+/*!
+    \reimp
+ */
+void QTabWidget::keyPressEvent(QKeyEvent *e)
+{
+    Q_D(QTabWidget);
+    if (((e->key() == Qt::Key_Tab || e->key() == Qt::Key_Backtab) &&
+          count() > 1 && e->modifiers() & Qt::ControlModifier)
+#ifdef QT_KEYPAD_NAVIGATION
+          || QApplication::keypadNavigationEnabled() && (e->key() == Qt::Key_Left || e->key() == Qt::Key_Right) && count() > 1
+#endif
+       ) {
+        int pageCount = d->tabs->count();
+        int page = currentIndex();
+        int dx = (e->key() == Qt::Key_Backtab || e->modifiers() & Qt::ShiftModifier) ? -1 : 1;
+#ifdef QT_KEYPAD_NAVIGATION
+        if (QApplication::keypadNavigationEnabled() && (e->key() == Qt::Key_Left || e->key() == Qt::Key_Right))
+            dx = e->key() == (isRightToLeft() ? Qt::Key_Right : Qt::Key_Left) ? -1 : 1;
+#endif
+        for (int pass = 0; pass < pageCount; ++pass) {
+            page+=dx;
+            if (page < 0
+#ifdef QT_KEYPAD_NAVIGATION
+                && !e->isAutoRepeat()
+#endif
+               ) {
+                page = count() - 1;
+            } else if (page >= pageCount
+#ifdef QT_KEYPAD_NAVIGATION
+                       && !e->isAutoRepeat()
+#endif
+                      ) {
+                page = 0;
+            }
+            if (d->tabs->isTabEnabled(page)) {
+                setCurrentIndex(page);
+                break;
+            }
+        }
+        if (!qApp->focusWidget())
+            d->tabs->setFocus();
+    } else {
+        e->ignore();
+    }
+}
+
+/*!
+    Returns the tab page at index position \a index or 0 if the \a
+    index is out of range.
+*/
+QWidget *QTabWidget::widget(int index) const
+{
+    Q_D(const QTabWidget);
+    return d->stack->widget(index);
+}
+
+/*!
+    \property QTabWidget::count
+    \brief the number of tabs in the tab bar
+
+    By default, this property contains a value of 0.
+*/
+int QTabWidget::count() const
+{
+    Q_D(const QTabWidget);
+    return d->tabs->count();
+}
+
+#ifndef QT_NO_TOOLTIP
+/*!
+    Sets the tab tool tip for the page at position \a index to \a tip.
+
+    \sa  tabToolTip()
+*/
+void QTabWidget::setTabToolTip(int index, const QString & tip)
+{
+    Q_D(QTabWidget);
+    d->tabs->setTabToolTip(index, tip);
+}
+
+/*!
+    Returns the tab tool tip for the page at position \a index or
+    an empty string if no tool tip has been set.
+
+    \sa setTabToolTip()
+*/
+QString QTabWidget::tabToolTip(int index) const
+{
+    Q_D(const QTabWidget);
+    return d->tabs->tabToolTip(index);
+}
+#endif // QT_NO_TOOLTIP
+
+#ifndef QT_NO_WHATSTHIS
+/*!
+    \since 4.1
+
+    Sets the What's This help text for the page at position \a index
+    to \a text.
+*/
+void QTabWidget::setTabWhatsThis(int index, const QString &text)
+{
+    Q_D(QTabWidget);
+    d->tabs->setTabWhatsThis(index, text);
+}
+
+/*!
+    \since 4.1
+
+    Returns the What's This help text for the page at position \a index,
+    or an empty string if no help text has been set.
+*/
+QString QTabWidget::tabWhatsThis(int index) const
+{
+    Q_D(const QTabWidget);
+    return d->tabs->tabWhatsThis(index);
+}
+#endif // QT_NO_WHATSTHIS
+
+/*!
+  This virtual handler is called after a new tab was added or
+  inserted at position \a index.
+
+  \sa tabRemoved()
+ */
+void QTabWidget::tabInserted(int index)
+{
+    Q_UNUSED(index)
+}
+
+/*!
+  This virtual handler is called after a tab was removed from
+  position \a index.
+
+  \sa tabInserted()
+ */
+void QTabWidget::tabRemoved(int index)
+{
+    Q_UNUSED(index)
+}
+
+/*!
+    \fn void QTabWidget::paintEvent(QPaintEvent *event)
+
+    Paints the tab widget's tab bar in response to the paint \a event.
+*/
+void QTabWidget::paintEvent(QPaintEvent *)
+{
+    Q_D(QTabWidget);
+    QStylePainter p(this);
+    if (documentMode()) {
+        if (QWidget *w = cornerWidget(Qt::TopLeftCorner)) {
+            QStyleOptionTabBarBaseV2 opt;
+            QTabBarPrivate::initStyleBaseOption(&opt, tabBar(), w->size());
+            opt.rect.moveLeft(w->x() + opt.rect.x());
+            opt.rect.moveTop(w->y() + opt.rect.y());
+            p.drawPrimitive(QStyle::PE_FrameTabBarBase, opt);
+        }
+        if (QWidget *w = cornerWidget(Qt::TopRightCorner)) {
+            QStyleOptionTabBarBaseV2 opt;
+            QTabBarPrivate::initStyleBaseOption(&opt, tabBar(), w->size());
+            opt.rect.moveLeft(w->x() + opt.rect.x());
+            opt.rect.moveTop(w->y() + opt.rect.y());
+            p.drawPrimitive(QStyle::PE_FrameTabBarBase, opt);
+        }
+        return;
+    }
+
+    QStyleOptionTabWidgetFrame opt;
+    initStyleOption(&opt);
+    opt.rect = d->panelRect;
+    p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
+}
+
+/*!
+    \property QTabWidget::iconSize
+    \brief The size for icons in the tab bar
+    \since 4.2
+
+    The default value is style-dependent. This is the maximum size
+    that the icons will have. Icons are not scaled up if they are of
+    smaller size.
+
+    \sa QTabBar::iconSize
+*/
+QSize QTabWidget::iconSize() const
+{
+    return d_func()->tabs->iconSize();
+}
+
+void QTabWidget::setIconSize(const QSize &size)
+{
+    d_func()->tabs->setIconSize(size);
+}
+
+/*!
+    \property QTabWidget::elideMode
+    \brief how to elide text in the tab bar
+    \since 4.2
+
+    This property controls how items are elided when there is not
+    enough space to show them for a given tab bar size.
+
+    By default the value is style dependant.
+
+    \sa QTabBar::elideMode usesScrollButtons QStyle::SH_TabBar_ElideMode
+*/
+Qt::TextElideMode QTabWidget::elideMode() const
+{
+    return d_func()->tabs->elideMode();
+}
+
+void QTabWidget::setElideMode(Qt::TextElideMode mode)
+{
+    d_func()->tabs->setElideMode(mode);
+}
+
+/*!
+    \property QTabWidget::usesScrollButtons
+    \brief Whether or not a tab bar should use buttons to scroll tabs when it
+    has many tabs.
+    \since 4.2
+
+    When there are too many tabs in a tab bar for its size, the tab bar can either choose
+    to expand its size or to add buttons that allow you to scroll through the tabs.
+
+    By default the value is style dependant.
+
+    \sa elideMode QTabBar::usesScrollButtons QStyle::SH_TabBar_PreferNoArrows
+*/
+bool QTabWidget::usesScrollButtons() const
+{
+    return d_func()->tabs->usesScrollButtons();
+}
+
+void QTabWidget::setUsesScrollButtons(bool useButtons)
+{
+    d_func()->tabs->setUsesScrollButtons(useButtons);
+}
+
+/*!
+    \property QTabWidget::documentMode
+    \brief Whether or not the tab widget is rendered in a mode suitable for document
+     pages. This is the same as document mode on Mac OS X.
+    \since 4.5
+
+    When this property is set the tab widget frame is not rendered. This mode is useful
+    for showing document-type pages where the page covers most of the tab widget
+    area.
+
+    \sa elideMode, QTabBar::documentMode, QTabBar::usesScrollButtons, QStyle::SH_TabBar_PreferNoArrows
+*/
+bool QTabWidget::documentMode() const
+{
+    Q_D(const QTabWidget);
+    return d->tabs->documentMode();
+}
+
+void QTabWidget::setDocumentMode(bool enabled)
+{
+    Q_D(QTabWidget);
+    d->tabs->setDocumentMode(enabled);
+    d->tabs->setExpanding(!enabled);
+    d->tabs->setDrawBase(enabled);
+    setUpLayout();
+}
+
+/*!
+    Removes all the pages, but does not delete them. Calling this function
+    is equivalent to calling removeTab() until the tab widget is empty.
+*/
+void QTabWidget::clear()
+{
+    // ### optimize by introduce QStackedLayout::clear()
+    while (count())
+        removeTab(0);
+}
+
+/*!
+    \fn void QTabWidget::insertTab(QWidget *widget, const QString &label, int index)
+
+    Use insertTab(index, widget, label) instead.
+*/
+
+/*!
+    \fn void QTabWidget::insertTab(QWidget *widget, const QIcon& icon, const QString &label, int index)
+
+    Use insertTab(index, widget, icon, label) instead.
+*/
+
+/*!
+    \fn void QTabWidget::changeTab(QWidget *widget, const QString
+    &label)
+
+    Use setTabText() instead.
+
+*/
+
+/*!
+    \fn void QTabWidget::changeTab(QWidget *widget, const QIcon& icon, const QString &label)
+
+    Use setTabText() and setTabIcon() instead.
+*/
+
+/*!
+    \fn bool QTabWidget::isTabEnabled( QWidget *widget) const
+
+    Use isTabEnabled(tabWidget->indexOf(widget)) instead.
+*/
+
+/*!
+    \fn void QTabWidget::setTabEnabled(QWidget *widget, bool b)
+
+    Use setTabEnabled(tabWidget->indexOf(widget), b) instead.
+*/
+
+/*!
+    \fn QString QTabWidget::tabLabel(QWidget *widget) const
+
+    Use tabText(tabWidget->indexOf(widget)) instead.
+*/
+
+/*!
+    \fn void QTabWidget::setTabLabel(QWidget *widget, const QString
+    &label)
+
+    Use setTabText(tabWidget->indexOf(widget), label) instead.
+*/
+
+/*!
+    \fn QIcon QTabWidget::tabIconSet(QWidget * widget) const
+
+    Use tabIcon(tabWidget->indexOf(widget)) instead.
+*/
+
+/*!
+    \fn void QTabWidget::setTabIconSet(QWidget * widget, const QIcon & icon)
+
+    Use setTabIcon(tabWidget->indexOf(widget), icon) instead.
+*/
+
+/*!
+    \fn void QTabWidget::removeTabToolTip(QWidget * widget)
+
+    Use setTabToolTip(tabWidget->indexOf(widget), QString()) instead.
+*/
+
+/*!
+    \fn void QTabWidget::setTabToolTip(QWidget * widget, const QString & tip)
+
+    Use setTabToolTip(tabWidget->indexOf(widget), tip) instead.
+*/
+
+/*!
+    \fn QString QTabWidget::tabToolTip(QWidget * widget) const
+
+    Use tabToolTip(tabWidget->indexOf(widget)) instead.
+*/
+
+/*!
+    \fn QWidget * QTabWidget::currentPage() const
+
+    Use currentWidget() instead.
+*/
+
+/*!
+    \fn QWidget *QTabWidget::page(int index) const
+
+    Use widget() instead.
+*/
+
+/*!
+    \fn QString QTabWidget::label(int index) const
+
+    Use tabText() instead.
+*/
+
+/*!
+    \fn int QTabWidget::currentPageIndex() const
+
+    Use currentIndex() instead.
+*/
+
+/*!
+    \fn int QTabWidget::margin() const
+
+    This function is kept only to make old code compile.
+    This functionality is no longer supported by QTabWidget.
+
+    \sa contentsRect(), setContentsMargins()
+*/
+
+/*!
+    \fn void QTabWidget::setMargin(int margin)
+
+    This function is kept only to make old code compile.
+    This functionality is no longer supported by QTabWidget.
+
+    \sa contentsRect(), setContentsMargins()
+*/
+
+/*!
+    \fn void QTabWidget::setCurrentPage(int index)
+
+    Use setCurrentIndex() instead.
+*/
+
+/*!
+    \fn void QTabWidget::showPage(QWidget *widget)
+
+    Use setCurrentIndex(indexOf(widget)) instead.
+*/
+
+/*!
+    \fn void QTabWidget::removePage(QWidget *widget)
+
+    Use removeTab(indexOf(widget)) instead.
+*/
+
+/*!
+    \fn void QTabWidget::currentChanged(QWidget *widget)
+
+    Use currentChanged(int) instead.
+*/
+
+QT_END_NAMESPACE
+
+#include "moc_qtabwidget.cpp"
+
+#endif //QT_NO_TABWIDGET