src/gui/widgets/qdockwidgetlayout.cpp

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/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 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 GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include "QtGui/qwidget.h"
#include "QtGui/qtabbar.h"
#include "QtGui/qstyle.h"
#include "QtCore/qvariant.h"
#include "qdockwidgetlayout_p.h"
#include "qdockwidget.h"
#include "qmainwindow.h"
#include "qwidgetanimator_p.h"
#include "qmainwindowlayout_p.h"
#include "private/qlayoutengine_p.h"
#include <qdebug.h>

#include <qpainter.h>
#include <qstyleoption.h>

#ifndef QT_NO_DOCKWIDGET

enum { StateFlagVisible = 1, StateFlagFloating = 2 };

static void checkLayoutInfo(const QDockAreaLayoutInfo &info)
{
    return;
    int pos = pick(info.o, info.rect.topLeft());
    bool prev_gap = false;
    bool first = true;
    for (int i = 0; i < info.item_list.size(); ++i) {
        const QDockAreaLayoutItem &item = info.item_list.at(i);
        if (item.skip())
            continue;

        bool gap = item.gap;
        if (!first && !gap && !prev_gap)
            pos += info.sep;

        if (item.pos != pos) {
            qDebug() << "##### checkLayoutInfo(): incorrect pos:"
                        << i << item.pos << pos;
        }

        pos += item.size;

        prev_gap = gap;
        first = false;
    }

    int bottom = pick(info.o, info.rect.bottomRight());
    --pos;
    if (pos != bottom) {
        qDebug() << "##### checkLayoutInfo(): incorrect bottom pos:"
                    << bottom << pos;
    }
}

/*
#ifndef QT_NO_TEXTSTREAM

static void dump(QDebug debug, const QDockAreaLayoutInfo &info, QString indent);
static void dump(QDebug debug, const QDockWidgetLayout &layout);

static void dump(QDebug debug, const QDockAreaLayoutItem &item, QString indent)
{
    debug << (const char*) indent.toLocal8Bit();
    if (item.skip())
        debug << "skip";
    if (item.gap)
        debug << "gap";
    debug << item.pos << item.size;
    if (item.widgetItem != 0)
        debug << item.widgetItem->widget();
    else if (item.subinfo != 0)
        dump(debug, *item.subinfo, indent);
    debug << '\n';
}

static void dump(QDebug debug, const QDockAreaLayoutInfo &info, QString indent)
{
    debug << "Info(";
    if (info.tabbed) {
        debug << "tabbed " << info.currentTabId();
        if (info.tabBar != 0)
            debug << "tabBar " << info.tabBar->count();
        if (info.tabBar != 0 && info.tabBar->isVisible())
            debug << "tabBarVisble";
    }
    debug << "\n";
    for (int i = 0; i < info.item_list.count(); ++i)
        dump(debug, info.item_list.at(i), indent + QLatin1String("  "));
    debug << (const char*) indent.toLocal8Bit() << ")\n";
}

static void dump(QDebug debug, const QDockWidgetLayout &layout)
{
    debug << "Top " << layout.docks[QDockWidgetLayout::TopPos].rect << "\n";
    dump(debug, layout.docks[QDockWidgetLayout::TopPos], QString());
    debug << "Left " << layout.docks[QDockWidgetLayout::LeftPos].rect << "\n";
    dump(debug, layout.docks[QDockWidgetLayout::LeftPos], QString());
    debug << "Bottom " << layout.docks[QDockWidgetLayout::BottomPos].rect << "\n";
    dump(debug, layout.docks[QDockWidgetLayout::BottomPos], QString());
    debug << "Right " << layout.docks[QDockWidgetLayout::RightPos].rect << "\n";
    dump(debug, layout.docks[QDockWidgetLayout::RightPos], QString());
}
#endif // QT_NO_TEXTSTREAM
*/

/******************************************************************************
** QDockAreaLayoutItem
*/

QDockAreaLayoutItem::QDockAreaLayoutItem(QWidgetItem *_widgetItem)
    : widgetItem(_widgetItem), subinfo(0), pos(0), size(-1), gap(false),
        keep_size(false)
{
}

QDockAreaLayoutItem::QDockAreaLayoutItem(QDockAreaLayoutInfo *_subinfo)
    : widgetItem(0), subinfo(_subinfo), pos(0), size(-1), gap(false),
        keep_size(false)
{
}

QDockAreaLayoutItem::QDockAreaLayoutItem(const QDockAreaLayoutItem &other)
    : widgetItem(other.widgetItem), subinfo(0), pos(other.pos),
        size(other.size), gap(other.gap), keep_size(other.keep_size)
{
    if (other.subinfo != 0)
        subinfo = new QDockAreaLayoutInfo(*other.subinfo);
    Q_ASSERT(widgetItem == 0 || subinfo == 0);
}

QDockAreaLayoutItem::~QDockAreaLayoutItem()
{
    delete subinfo;
}

bool QDockAreaLayoutItem::skip() const
{
    if (gap)
        return false;

    if (widgetItem != 0) {
        QWidget *widget = widgetItem->widget();
        return widget->isWindow() || widget->isHidden();
    }

    if (subinfo != 0) {
        for (int i = 0; i < subinfo->item_list.count(); ++i) {
            if (!subinfo->item_list.at(i).skip())
                return false;
        }
    }

    return true;
}

static QSize adjustForFrame(QWidget *widget)
{
    if (widget->isWindow())
        return QSize(0, 0);
    int fw = widget->style()->pixelMetric(QStyle::PM_DockWidgetFrameWidth);
    QSize result(2*fw, fw);
#ifdef Q_OS_WIN
    result += QSize(0, 3);
#endif
    return result;
}

QSize QDockAreaLayoutItem::minimumSize() const
{
    if (widgetItem != 0)
        return qSmartMinSize(widgetItem) + adjustForFrame(widgetItem->widget());
    if (subinfo != 0)
        return subinfo->minimumSize();
    return QSize(0, 0);
}

QSize QDockAreaLayoutItem::maximumSize() const
{
    if (widgetItem != 0)
        return qSmartMaxSize(widgetItem);
    if (subinfo != 0)
        return subinfo->maximumSize();
    return QSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
}

bool QDockAreaLayoutItem::expansive(Qt::Orientation o) const
{
    if (gap)
        return false;
    if (widgetItem != 0)
        return ((widgetItem->expandingDirections() & o) == o);
    if (subinfo != 0)
        return subinfo->expansive(o);
    return false;
}

QSize QDockAreaLayoutItem::sizeHint() const
{
    if (widgetItem != 0) {
        QWidget *w = widgetItem->widget();
        QSize s = w->sizeHint().expandedTo(w->minimumSizeHint());
        if (w->sizePolicy().horizontalPolicy() == QSizePolicy::Ignored)
            s.setWidth(0);
        if (w->sizePolicy().verticalPolicy() == QSizePolicy::Ignored)
            s.setHeight(0);
        s = s.boundedTo(w->maximumSize())
            .expandedTo(w->minimumSize());

        s += adjustForFrame(w);
        return s;
    }
    if (subinfo != 0)
        return subinfo->sizeHint();
    return QSize(-1, -1);
}

QDockAreaLayoutItem
    &QDockAreaLayoutItem::operator = (const QDockAreaLayoutItem &other)
{
    widgetItem = other.widgetItem;
    if (other.subinfo == 0)
        subinfo = 0;
    else
        subinfo = new QDockAreaLayoutInfo(*other.subinfo);
    pos = other.pos;
    size = other.size;
    gap = other.gap;

    return *this;
}

/******************************************************************************
** QDockAreaLayoutInfo
*/

static quintptr tabId(const QDockAreaLayoutItem &item)
{
    if (item.widgetItem == 0)
        return 0;
    return reinterpret_cast<quintptr>(item.widgetItem->widget());
}

QDockAreaLayoutInfo::QDockAreaLayoutInfo()
    : sep(0), o(Qt::Horizontal), rect(0, 0, -1, -1), mainWindow(0)
#ifndef QT_NO_TABBAR
    , tabbed(false), tabBar(0), tabBarShape(-1)
#endif
{
}

QDockAreaLayoutInfo::QDockAreaLayoutInfo(int _sep, Qt::Orientation _o, int tbshape,
                                            QMainWindow *window)
    : sep(_sep), o(_o), rect(0, 0, -1, -1), mainWindow(window)
#ifndef QT_NO_TABBAR
    , tabbed(false), tabBar(0), tabBarShape(tbshape)
#endif
{
#ifdef QT_NO_TABBAR
    Q_UNUSED(tbshape);
#endif
}

QSize QDockAreaLayoutInfo::size() const
{
    return isEmpty() ? QSize(0, 0) : rect.size();
}

void QDockAreaLayoutInfo::clear()
{
    item_list.clear();
    rect = QRect(0, 0, -1, -1);
#ifndef QT_NO_TABBAR
    tabbed = false;
    tabBar = 0;
#endif
}

bool QDockAreaLayoutInfo::isEmpty() const
{
    return next(-1) == -1;
}

QSize QDockAreaLayoutInfo::minimumSize() const
{
    if (isEmpty())
        return QSize(0, 0);

    int a = 0, b = 0;
    bool first = true;
    for (int i = 0; i < item_list.size(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);
        if (item.skip())
            continue;

        QSize min_size = item.minimumSize();
#ifndef QT_NO_TABBAR
        if (tabbed) {
            a = qMax(a, pick(o, min_size));
        } else
#endif
        {
            if (!first)
                a += sep;
            a += pick(o, min_size);
        }
        b = qMax(b, perp(o, min_size));

        first = false;
    }

    QSize result;
    rpick(o, result) = a;
    rperp(o, result) = b;

#ifndef QT_NO_TABBAR
    if (tabbed) {
        QSize tbm = tabBarMinimumSize();
        switch (tabBarShape) {
            case QTabBar::RoundedNorth:
            case QTabBar::RoundedSouth:
                result.rheight() += tbm.height();
                result.rwidth() = qMax(tbm.width(), result.width());
                break;
            case QTabBar::RoundedEast:
            case QTabBar::RoundedWest:
                result.rheight() = qMax(tbm.height(), result.height());
                result.rwidth() += tbm.width();
                break;
            default:
                break;
        }
    }
#endif // QT_NO_TABBAR

    return result;
}

QSize QDockAreaLayoutInfo::maximumSize() const
{
    if (isEmpty())
        return QSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);

    int a = 0, b = QWIDGETSIZE_MAX;
#ifndef QT_NO_TABBAR
    if (tabbed)
        a = QWIDGETSIZE_MAX;
#endif

    bool first = true;
    for (int i = 0; i < item_list.size(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);
        if (item.skip())
            continue;


        QSize max_size = item.maximumSize();

#ifndef QT_NO_TABBAR
        if (tabbed) {
            a = qMin(a, pick(o, max_size));
        } else
#endif
        {
            if (!first)
                a += sep;
            a += pick(o, max_size);
        }
        b = qMin(b, perp(o, max_size));

        a = qMin(a, int(QWIDGETSIZE_MAX));
        b = qMin(b, int(QWIDGETSIZE_MAX));

        first = false;
    }

    QSize result;
    rpick(o, result) = a;
    rperp(o, result) = b;

#ifndef QT_NO_TABBAR
    if (tabbed) {
        QSize tbh = tabBarSizeHint();
        switch (tabBarShape) {
            case QTabBar::RoundedNorth:
            case QTabBar::RoundedSouth:
                result.rheight() += tbh.height();
                break;
            case QTabBar::RoundedEast:
            case QTabBar::RoundedWest:
                result.rwidth() += tbh.width();
                break;
            default:
                break;
        }
    }
#endif // QT_NO_TABBAR

    return result;
}

QSize QDockAreaLayoutInfo::sizeHint() const
{
    if (isEmpty())
        return QSize(0, 0);

    int a = 0, b = 0;
    bool prev_gap = false;
    bool first = true;
    for (int i = 0; i < item_list.size(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);
        if (item.skip())
            continue;

        bool gap = item.gap;

        QSize size_hint = item.sizeHint();

#ifndef QT_NO_TABBAR
        if (tabbed) {
            a = qMax(a, gap ? item.size : pick(o, size_hint));
        } else
#endif
        {
            if (!first && !gap && !prev_gap)
                a += sep;
            a += gap ? item.size : pick(o, size_hint);
        }
        b = qMax(b, perp(o, size_hint));

        prev_gap = gap;
        first = false;
    }

    QSize result;
    rpick(o, result) = a;
    rperp(o, result) = b;

#ifndef QT_NO_TABBAR
    if (tabbed) {
        QSize tbh = tabBarSizeHint();
        switch (tabBarShape) {
            case QTabBar::RoundedNorth:
            case QTabBar::RoundedSouth:
                result.rheight() += tbh.height();
                result.rwidth() = qMax(tbh.width(), result.width());
                break;
            case QTabBar::RoundedEast:
            case QTabBar::RoundedWest:
                result.rheight() = qMax(tbh.height(), result.height());
                result.rwidth() += tbh.width();
                break;
            default:
                break;
        }
    }
#endif // QT_NO_TABBAR

    return result;
}

bool QDockAreaLayoutInfo::expansive(Qt::Orientation o) const
{
    for (int i = 0; i < item_list.size(); ++i) {
        if (item_list.at(i).expansive(o))
            return true;
    }
    return false;
}

void QDockAreaLayoutInfo::fitItems()
{
#ifndef QT_NO_TABBAR
    if (tabbed) {
        return;
    }
#endif

    QVector<QLayoutStruct> layout_struct_list(item_list.size()*2);
    int j = 0;

    int size = pick(o, rect.size());
    int min_size = pick(o, minimumSize());

    bool prev_gap = false;
    bool first = true;
    for (int i = 0; i < item_list.size(); ++i) {
        QDockAreaLayoutItem &item = item_list[i];
        if (item.skip())
            continue;

        bool gap = item.gap;
        if (!first && !gap && !prev_gap) {
            QLayoutStruct &ls = layout_struct_list[j++];
            ls.empty = false;
            ls.init();
            ls.minimumSize = sep;
            ls.maximumSize = sep;
            ls.sizeHint = sep;
        }

        if (item.keep_size) {
            int d = item.size - pick(o, item.minimumSize());
            if (min_size + d <= size)
                min_size -= d;
            else
                item.keep_size = false; // sorry, not enough space
        }

        QLayoutStruct &ls = layout_struct_list[j++];
        ls.init();
        ls.empty = false;
        if (gap || item.keep_size) {
            ls.minimumSize = ls.maximumSize = ls.sizeHint = item.size;
            ls.expansive = false;
            ls.stretch = 0;
        } else {
            ls.minimumSize = pick(o, item.minimumSize());
            ls.maximumSize = pick(o, item.maximumSize());
            ls.expansive = item.expansive(o);
            if (ls.expansive) {
                ls.sizeHint = ls.minimumSize;
                ls.stretch = item.size == -1 ? pick(o, item.sizeHint()) : item.size;
            } else {
                ls.sizeHint = item.size == -1 ? pick(o, item.sizeHint()) : item.size;
            }
        }

        item.keep_size = false;
        prev_gap = gap;
        first = false;
    }
    layout_struct_list.resize(j);

    qGeomCalc(layout_struct_list, 0, j, pick(o, rect.topLeft()), size, 0);

    j = 0;
    prev_gap = false;
    first = true;
    for (int i = 0; i < item_list.size(); ++i) {
        QDockAreaLayoutItem &item = item_list[i];
        if (item.skip())
            continue;

        bool gap = item.gap;
        if (!first && !gap && !prev_gap)
            ++j;

        const QLayoutStruct &ls = layout_struct_list.at(j++);
        item.size = ls.size;
        item.pos = ls.pos;

        if (item.subinfo != 0) {
            item.subinfo->rect = itemRect(i);
            item.subinfo->fitItems();
        }

        prev_gap = gap;
        first = false;
    }

    checkLayoutInfo(*this);
}

static QDockWidgetLayout::DockPos dockPos(const QRect &rect, const QPoint &_pos,
                                                Qt::Orientation o, bool nestingEnabled)
{
    QPoint pos = _pos - rect.topLeft();

    int x = pos.x();
    int y = pos.y();
    int w = rect.width();
    int h = rect.height();

    // is it in the center?
    if (nestingEnabled) {
    /*             2/3
            +--------------+
            |              |
            |   CCCCCCCC   |
       2/3  |   CCCCCCCC   |
            |   CCCCCCCC   |
            |              |
            +--------------+     */

        QRect center(w/6, h/6, 2*w/3, 2*h/3);
        if (center.contains(pos))
            return QDockWidgetLayout::CenterPos;
    } else if (o == Qt::Horizontal) {
    /*             2/3
            +--------------+
            |   CCCCCCCC   |
            |   CCCCCCCC   |
            |   CCCCCCCC   |
            |   CCCCCCCC   |
            |   CCCCCCCC   |
            +--------------+     */

        if (x > w/6 && x < w*5/6)
            return QDockWidgetLayout::CenterPos;
    } else {
     /*
            +--------------+
            |              |
       2/3  |CCCCCCCCCCCCCC|
            |CCCCCCCCCCCCCC|
            |              |
            +--------------+     */
        if (y > h/6 && y < 5*h/6)
            return QDockWidgetLayout::CenterPos;
    }

    // not in the center. which edge?
    if (nestingEnabled) {
        if (o == Qt::Horizontal) {
    /*       1/3  1/3 1/3
            +------------+     (we've already ruled out the center)
            |LLLLTTTTRRRR|
            |LLLLTTTTRRRR|
            |LLLLBBBBRRRR|
            |LLLLBBBBRRRR|
            +------------+    */

            if (x < w/3)
                return QDockWidgetLayout::LeftPos;
            if (x > 2*w/3)
                return QDockWidgetLayout::RightPos;
            if (y < h/2)
                return QDockWidgetLayout::TopPos;
            return QDockWidgetLayout::BottomPos;
        } else {
    /*      +------------+     (we've already ruled out the center)
        1/3 |TTTTTTTTTTTT|
            |LLLLLLRRRRRR|
        1/3 |LLLLLLRRRRRR|
        1/3 |BBBBBBBBBBBB|
            +------------+    */

            if (y < h/3)
                return QDockWidgetLayout::TopPos;
            if (y > 2*h/3)
                return QDockWidgetLayout::BottomPos;
            if (x < w/2)
                return QDockWidgetLayout::LeftPos;
            return QDockWidgetLayout::RightPos;
        }
    } else {
        if (o == Qt::Horizontal) {
            return x < w/2
                    ? QDockWidgetLayout::LeftPos
                    : QDockWidgetLayout::RightPos;
        } else {
            return y < h/2
                    ? QDockWidgetLayout::TopPos
                    : QDockWidgetLayout::BottomPos;
        }
    }
}

QList<int> QDockAreaLayoutInfo::gapIndex(const QPoint& _pos, bool nestingEnabled) const
{
    QList<int> result;
    QRect item_rect;
    int item_index = 0;

#ifndef QT_NO_TABBAR
    if (tabbed) {
        item_rect = tabContentRect();
    } else
#endif
    {
        int pos = pick(o, _pos);

        int last = -1;
        for (int i = 0; i < item_list.size(); ++i) {
            const QDockAreaLayoutItem &item = item_list.at(i);
            if (item.skip())
                continue;

            last = i;

            if (item.pos + item.size < pos)
                continue;

            if (item.subinfo != 0
#ifndef QT_NO_TABBAR
                && !item.subinfo->tabbed
#endif
                ) {
                result = item.subinfo->gapIndex(_pos, nestingEnabled);
                result.prepend(i);
                return result;
            }

            item_rect = itemRect(i);
            item_index = i;
            break;
        }

        if (item_rect.isNull()) {
            result.append(last + 1);
            return result;
        }
    }

    Q_ASSERT(!item_rect.isNull());

    QDockWidgetLayout::DockPos dock_pos
        = dockPos(item_rect, _pos, o, nestingEnabled);

    switch (dock_pos) {
        case QDockWidgetLayout::LeftPos:
            if (o == Qt::Horizontal)
                result << item_index;
            else
                result << item_index << 0; // this subinfo doesn't exist yet, but insertGap()
                                           // handles this by inserting it
            break;
        case QDockWidgetLayout::RightPos:
            if (o == Qt::Horizontal)
                result << item_index + 1;
            else
                result << item_index << 1;
            break;
        case QDockWidgetLayout::TopPos:
            if (o == Qt::Horizontal)
                result << item_index << 0;
            else
                result << item_index;
            break;
        case QDockWidgetLayout::BottomPos:
            if (o == Qt::Horizontal)
                result << item_index << 1;
            else
                result << item_index + 1;
            break;
        case QDockWidgetLayout::CenterPos:
            result << (-item_index - 1) << 0;   // negative item_index means "on top of"
                                                // -item_index - 1, insertGap()
                                                // will insert a tabbed subinfo
            break;
        default:
            break;
    }

    return result;
}

static inline int shrink(QLayoutStruct &ls, int delta)
{
    if (ls.empty)
        return 0;
    int old_size = ls.size;
    ls.size = qMax(ls.size - delta, ls.minimumSize);
    return old_size - ls.size;
}

static inline int grow(QLayoutStruct &ls, int delta)
{
    if (ls.empty)
        return 0;
    int old_size = ls.size;
    ls.size = qMin(ls.size + delta, ls.maximumSize);
    return ls.size - old_size;
}

static int separatorMove(QVector<QLayoutStruct> &list, int index, int delta, int sep)
{
    // adjust sizes
    int pos = -1;
    for (int i = 0; i < list.size(); ++i) {
        const QLayoutStruct &ls = list.at(i);
        if (!ls.empty) {
            pos = ls.pos;
            break;
        }
    }
    if (pos == -1)
        return 0;

    if (delta > 0) {
        int growlimit = 0;
        for (int i = 0; i<=index; ++i) {
            const QLayoutStruct &ls = list.at(i);
            if (ls.empty)
                continue;
            if (ls.maximumSize == QLAYOUTSIZE_MAX) {
                growlimit = QLAYOUTSIZE_MAX;
                break;
            }
            growlimit += ls.maximumSize - ls.size;
        }
        if (delta > growlimit)
            delta = growlimit;

        int d = 0;
        for (int i = index + 1; d < delta && i < list.count(); ++i)
            d += shrink(list[i], delta - d);
        delta = d;
        d = 0;
        for (int i = index; d < delta && i >= 0; --i)
            d += grow(list[i], delta - d);
    } else if (delta < 0) {
        int growlimit = 0;
        for (int i = index + 1; i < list.count(); ++i) {
            const QLayoutStruct &ls = list.at(i);
            if (ls.empty)
                continue;
            if (ls.maximumSize == QLAYOUTSIZE_MAX) {
                growlimit = QLAYOUTSIZE_MAX;
                break;
            }
            growlimit += ls.maximumSize - ls.size;
        }
        if (-delta > growlimit)
            delta = -growlimit;

        int d = 0;
        for (int i = index; d < -delta && i >= 0; --i)
            d += shrink(list[i], -delta - d);
        delta = -d;
        d = 0;
        for (int i = index + 1; d < -delta && i < list.count(); ++i)
            d += grow(list[i], -delta - d);
    }

    // adjust positions
    bool first = true;
    for (int i = 0; i < list.size(); ++i) {
        QLayoutStruct &ls = list[i];
        if (ls.empty)
            continue;
        if (!first)
            pos += sep;
        ls.pos = pos;
        pos += ls.size;
        first = false;
    }

    return delta;
}

int QDockAreaLayoutInfo::separatorMove(int index, int delta, QVector<QLayoutStruct> *cache)
{
    Q_ASSERT(!tabbed);

    if (cache->isEmpty()) {
        QVector<QLayoutStruct> &list = *cache;
        list.resize(item_list.size());
        for (int i = 0; i < item_list.size(); ++i) {
            const QDockAreaLayoutItem &item = item_list.at(i);
            QLayoutStruct &ls = list[i];
            Q_ASSERT(!item.gap);
            if (item.skip()) {
                ls.empty = true;
            } else {
                ls.empty = false;
                ls.pos = item.pos;
                ls.size = item.size;
                ls.minimumSize = pick(o, item.minimumSize());
                ls.maximumSize = pick(o, item.maximumSize());
            }
        }
    }

    QVector<QLayoutStruct> list = *cache;

    delta = ::separatorMove(list, index, delta, sep);

    for (int i = 0; i < item_list.size(); ++i) {
        QDockAreaLayoutItem &item = item_list[i];
        if (item.skip())
            continue;
        QLayoutStruct &ls = list[i];
        item.size = ls.size;
        item.pos = ls.pos;

        if (item.subinfo != 0) {
            item.subinfo->rect = itemRect(i);
            item.subinfo->fitItems();
        }
    }

    return delta;
}

void QDockAreaLayoutInfo::unnest(int index)
{
    QDockAreaLayoutItem &item = item_list[index];
    if (item.subinfo == 0)
        return;
    if (item.subinfo->item_list.count() > 1)
        return;
    Q_ASSERT(item.subinfo->item_list.count() != 0);

    if (item.subinfo->item_list.count() == 1) {
        QDockAreaLayoutItem &child = item.subinfo->item_list.first();
        if (child.widgetItem != 0) {
            item.widgetItem = child.widgetItem;
            delete item.subinfo;
            item.subinfo = 0;
        } else if (child.subinfo != 0) {
            QDockAreaLayoutInfo *tmp = item.subinfo;
            item.subinfo = child.subinfo;
            child.subinfo = 0;
            tmp->item_list.clear();
            delete tmp;
        }
    }
}

void QDockAreaLayoutInfo::remove(QList<int> path)
{
    Q_ASSERT(!path.isEmpty());

    if (path.count() > 1) {
        int index = path.takeFirst();
        QDockAreaLayoutItem &item = item_list[index];
        Q_ASSERT(item.subinfo != 0);
        item.subinfo->remove(path);
        unnest(index);
    } else {
        int index = path.first();
        item_list.removeAt(index);
    }
}

QRect QDockAreaLayoutInfo::convertToWidget(QList<int> path, QWidgetItem *dockWidgetItem)
{
    Q_ASSERT(!path.isEmpty());

    int index = path.takeFirst();
    if (index < 0)
        index = -index - 1;

    if (!path.isEmpty()) {
        const QDockAreaLayoutItem &item = item_list.at(index);
        Q_ASSERT(item.subinfo != 0);
        return item.subinfo->convertToWidget(path, dockWidgetItem);
    }

    QDockAreaLayoutItem &item = item_list[index];

    Q_ASSERT(item.gap);
    item.gap = false;
    Q_ASSERT(item.widgetItem == dockWidgetItem);

    QRect result;

#ifndef QT_NO_TABBAR
    if (tabbed) {
        result = tabContentRect();
    } else
#endif
    {
        int prev = this->prev(index);
        int next = this->next(index);

        if (prev != -1 && !item_list.at(prev).gap) {
            item.pos += sep;
            item.size -= sep;
        }
        if (next != -1 && !item_list.at(next).gap)
            item.size -= sep;

        QPoint pos;
        rpick(o, pos) = item.pos;
        rperp(o, pos) = perp(o, rect.topLeft());
        QSize s;
        rpick(o, s) = item.size;
        rperp(o, s) = perp(o, rect.size());
        result = QRect(pos, s);
    }

    return result;
}

QWidgetItem *QDockAreaLayoutInfo::convertToGap(QList<int> path)
{
    Q_ASSERT(!path.isEmpty());

    if (path.count() > 1) {
        int index = path.takeFirst();
        const QDockAreaLayoutItem &item = item_list.at(index);
        Q_ASSERT(item.subinfo != 0);
        QWidgetItem *result = item.subinfo->convertToGap(path);
        return result;
    }

    int index = path.first();
    QDockAreaLayoutItem &item = item_list[index];
    int prev = this->prev(index);
    int next = this->next(index);

    Q_ASSERT(!item.gap);
    item.gap = true;

#ifndef QT_NO_TABBAR
    if (tabbed) {
    } else
#endif
    {
        if (prev != -1 && !item_list.at(prev).gap) {
            item.pos -= sep;
            item.size += sep;
        }
        if (next != -1 && !item_list.at(next).gap)
            item.size += sep;
    }

    return item.widgetItem;
}

#ifndef QT_NO_TABBAR

quintptr QDockAreaLayoutInfo::currentTabId() const
{
    if (!tabbed || tabBar == 0)
        return 0;

    int index = tabBar->currentIndex();
    if (index == -1)
        return 0;

    return qvariant_cast<quintptr>(tabBar->tabData(index));
}

void QDockAreaLayoutInfo::setCurrentTab(QWidget *widget)
{
    setCurrentTabId(reinterpret_cast<quintptr>(widget));
}

void QDockAreaLayoutInfo::setCurrentTabId(quintptr id)
{
    if (!tabbed || tabBar == 0)
        return;

    for (int i = 0; i < tabBar->count(); ++i) {
        if (qvariant_cast<quintptr>(tabBar->tabData(i)) == id) {
            tabBar->setCurrentIndex(i);
            return;
        }
    }

    qDebug("QDockAreaLayoutInfo::setCurrentTabId(): not found!");
}

#endif // QT_NO_TABBAR

bool QDockAreaLayoutInfo::insertGap(QList<int> path, QWidgetItem *dockWidgetItem)
{
    Q_ASSERT(!path.isEmpty());

    bool insert_tabbed = false;
    int index = path.takeFirst();
    if (index < 0) {
        insert_tabbed = true;
        index = -index - 1;
    }

//    dump(qDebug() << "insertGap() before:" << index << tabIndex, *this, QString());

    if (!path.isEmpty()) {
        QDockAreaLayoutItem &item = item_list[index];

        if (item.subinfo == 0
#ifndef QT_NO_TABBAR
            || item.subinfo->tabbed && !insert_tabbed
#endif
            ) {
            // this is not yet a nested layout - make it

            QDockAreaLayoutInfo *subinfo = item.subinfo;
            QWidgetItem *widgetItem = item.widgetItem;
            QRect r = subinfo == 0 ? widgetItem->geometry() : subinfo->rect;

            Qt::Orientation opposite = o == Qt::Horizontal ? Qt::Vertical : Qt::Horizontal;
#ifdef QT_NO_TABBAR
            const int tabBarShape = 0;
#endif
            QDockAreaLayoutInfo *new_info
                = new QDockAreaLayoutInfo(sep, opposite, tabBarShape, mainWindow);

            item.subinfo = new_info;
            item.widgetItem = 0;

            QDockAreaLayoutItem new_item
                = widgetItem == 0
                    ? QDockAreaLayoutItem(subinfo)
                    : QDockAreaLayoutItem(widgetItem);
            new_item.size = pick(opposite, r.size());
            new_item.pos = pick(opposite, r.topLeft());
            new_info->item_list.append(new_item);
#ifndef QT_NO_TABBAR
            if (insert_tabbed) {
                new_info->tabbed = true;
            }
#endif
        }

        bool result = item.subinfo->insertGap(path, dockWidgetItem);
        return result;
    }

    // create the gap item
    QDockAreaLayoutItem gap_item;
    gap_item.gap = true;
    gap_item.widgetItem = dockWidgetItem;   // so minimumSize(), maximumSize() and
                                            // sizeHint() will work
#ifndef QT_NO_TABBAR
    if (!tabbed)
#endif
    {
        int prev = this->prev(index);
        int next = this->next(index - 1);
        // find out how much space we have in the layout
        int space = 0;
        if (isEmpty()) {
            space = pick(o, rect.size());
        } else {
            for (int i = 0; i < item_list.count(); ++i) {
                const QDockAreaLayoutItem &item = item_list.at(i);
                if (item.skip())
                    continue;
                Q_ASSERT(!item.gap);
                space += item.size - pick(o, item.minimumSize());
            }
        }

        // find the actual size of the gap
        int gap_size = 0;
        int sep_size = 0;
        if (isEmpty()) {
            gap_size = space;
            sep_size = 0;
        } else {
            gap_size = pick(o, dockWidgetItem->geometry().size());
            if (prev != -1 && !item_list.at(prev).gap)
                sep_size += sep;
            if (next != -1 && !item_list.at(next).gap)
                sep_size += sep;
        }
        if (gap_size + sep_size > space)
            gap_size = pick(o, gap_item.minimumSize());
        gap_item.size = gap_size + sep_size;
    }

    // finally, insert the gap
    item_list.insert(index, gap_item);

//    dump(qDebug() << "insertGap() after:" << index << tabIndex, *this, QString());

    return true;
}

QDockAreaLayoutInfo *QDockAreaLayoutInfo::info(QWidget *widget)
{
    for (int i = 0; i < item_list.count(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);
        if (item.skip())
            continue;

#ifndef QT_NO_TABBAR
        if (tabbed && widget == tabBar)
            return this;
#endif

        if (item.widgetItem != 0 && item.widgetItem->widget() == widget)
            return this;

        if (item.subinfo != 0) {
            if (QDockAreaLayoutInfo *result = item.subinfo->info(widget))
                return result;
        }
    }

    return 0;
}

QDockAreaLayoutInfo *QDockAreaLayoutInfo::info(QList<int> path)
{
    int index = path.takeFirst();
    if (index < 0)
        index = -index - 1;
    if (index >= item_list.count())
        return this;
    if (path.isEmpty() || item_list.at(index).subinfo == 0)
        return this;
    return item_list.at(index).subinfo->info(path);
}

QRect QDockAreaLayoutInfo::itemRect(int index) const
{
    const QDockAreaLayoutItem &item = item_list.at(index);

    if (item.skip())
        return QRect();

    QRect result;

#ifndef QT_NO_TABBAR
    if (tabbed) {
        if (tabId(item) == currentTabId())
            result = tabContentRect();
    } else
#endif
    {
        QPoint pos;
        rpick(o, pos) = item.pos;
        rperp(o, pos) = perp(o, rect.topLeft());
        QSize s;
        rpick(o, s) = item.size;
        rperp(o, s) = perp(o, rect.size());
        result = QRect(pos, s);
    }

    return result;
}

QRect QDockAreaLayoutInfo::itemRect(QList<int> path) const
{
    Q_ASSERT(!path.isEmpty());

    if (path.count() > 1) {
        const QDockAreaLayoutItem &item = item_list.at(path.takeFirst());
        Q_ASSERT(item.subinfo != 0);
        return item.subinfo->itemRect(path);
    }

    return itemRect(path.first());
}

QRect QDockAreaLayoutInfo::separatorRect(int index) const
{
#ifndef QT_NO_TABBAR
    if (tabbed)
        return QRect();
#endif

    const QDockAreaLayoutItem &item = item_list.at(index);
    if (item.skip())
        return QRect();

    QPoint pos = rect.topLeft();
    rpick(o, pos) = item.pos + item.size;
    QSize s = rect.size();
    rpick(o, s) = sep;

    return QRect(pos, s);
}

QRect QDockAreaLayoutInfo::separatorRect(QList<int> path) const
{
    Q_ASSERT(!path.isEmpty());

    if (path.count() > 1) {
        const QDockAreaLayoutItem &item = item_list.at(path.takeFirst());
        Q_ASSERT(item.subinfo != 0);
        return item.subinfo->separatorRect(path);
    }
    return separatorRect(path.first());
}

QList<int> QDockAreaLayoutInfo::findSeparator(const QPoint &_pos) const
{
#ifndef QT_NO_TABBAR
    if (tabbed)
        return QList<int>();
#endif

    int pos = pick(o, _pos);

    for (int i = 0; i < item_list.size(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);
        if (item.skip() || item.gap)
            continue;

        if (item.pos + item.size > pos) {
            if (item.subinfo != 0) {
                QList<int> result = item.subinfo->findSeparator(_pos);
                if (!result.isEmpty()) {
                    result.prepend(i);
                    return result;
                } else {
                    return QList<int>();
                }
            }
        }

        int next = this->next(i);
        if (next == -1 || item_list.at(next).gap)
            continue;

        if (pos > item.pos + item.size && item.pos + item.size + sep > pos) {
            QList<int> result;
            result.append(i);
            return result;
        }
    }

    return QList<int>();
}

QList<int> QDockAreaLayoutInfo::indexOf(QWidget *widget, IndexOfFlag flag) const
{
    for (int i = 0; i < item_list.size(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);

        if (item.subinfo != 0) {
            QList<int> result = item.subinfo->indexOf(widget, flag);
            if (!result.isEmpty()) {
                result.prepend(i);
                return result;
            }
            continue;
        }

        if (flag != IndexOfFindsAll) {
            if ((flag == IndexOfFindsVisible) == item.skip())
                continue;
        }

        if (item.widgetItem->widget() == widget) {
            QList<int> result;
            result << i;
            return result;
        }
    }

    return QList<int>();
}

QMainWindowLayout *QDockAreaLayoutInfo::mainWindowLayout() const
{
    QMainWindowLayout *result = qobject_cast<QMainWindowLayout*>(mainWindow->layout());
    Q_ASSERT(result != 0);
    return result;
}

void QDockAreaLayoutInfo::apply(bool animate)
{
    QWidgetAnimator *widgetAnimator = mainWindowLayout()->widgetAnimator;

#ifndef QT_NO_TABBAR
    if (tabbed) {
        QRect tab_rect;
        QSize tbh = tabBarSizeHint();

        if (tabBarVisible) {
            switch (tabBarShape) {
                case QTabBar::RoundedNorth:
                    tab_rect = QRect(rect.left(), rect.top(), rect.width(), tbh.height());
                    break;
                case QTabBar::RoundedSouth:
                    tab_rect = QRect(rect.left(), rect.bottom() - tbh.height() + 1,
                                        rect.width(), tbh.height());
                    break;
                case QTabBar::RoundedEast:
                    tab_rect = QRect(rect.right() - tbh.width() + 1, rect.top(),
                                        tbh.width(), rect.height());
                    break;
                case QTabBar::RoundedWest:
                    tab_rect = QRect(rect.left(), rect.top(),
                                        tbh.width(), rect.height());
                    break;
                default:
                    break;
            }
        }

        if (tab_rect != tabBar->geometry())
            widgetAnimator->animate(tabBar, tab_rect, animate);
//        dump(qDebug() << "QDockAreaLayoutInfo::apply():" << tabIndex, *this, QString());
    }
#endif // QT_NO_TABBAR

    for (int i = 0; i < item_list.size(); ++i) {
        QDockAreaLayoutItem &item = item_list[i];
        if (item.gap || item.skip())
            continue;
        if (item.subinfo) {
            item.subinfo->apply(animate);
        } else {
            Q_ASSERT(item.widgetItem);
            QRect r = itemRect(i);
            QWidget *w = item.widgetItem->widget();
            widgetAnimator->animate(w, r, animate);
        }
    }
}

static void paintSep(QPainter *p, QWidget *w, const QRect &r, Qt::Orientation o, bool mouse_over)
{
    QStyleOption opt(0);
    opt.state = QStyle::State_None;
    if (w->isEnabled())
        opt.state |= QStyle::State_Enabled;
    if (o != Qt::Horizontal)
        opt.state |= QStyle::State_Horizontal;
    if (mouse_over)
        opt.state |= QStyle::State_MouseOver;
    opt.rect = r;
    opt.palette = w->palette();

    w->style()->drawPrimitive(QStyle::PE_IndicatorDockWidgetResizeHandle, &opt, p, w);
}

QRegion QDockAreaLayoutInfo::separatorRegion() const
{
    QRegion result;

    if (isEmpty())
        return result;
#ifndef QT_NO_TABBAR
    if (tabbed)
        return result;
#endif

    for (int i = 0; i < item_list.count(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);

        if (item.skip())
            continue;

        int next = this->next(i);

        if (item.subinfo)
            result |= item.subinfo->separatorRegion();

        if (next == -1)
            break;
        result |= separatorRect(i);
    }

    return result;
}

void QDockAreaLayoutInfo::paintSeparators(QPainter *p, QWidget *widget,
                                                    const QRegion &clip,
                                                    const QPoint &mouse) const
{
    if (isEmpty())
        return;
#ifndef QT_NO_TABBAR
    if (tabbed)
        return;
#endif

    for (int i = 0; i < item_list.count(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);

        if (item.skip())
            continue;

        int next = this->next(i);
        if (item.gap || next != -1 && item_list.at(next).gap)
            continue;

        if (item.subinfo) {
            if (clip.contains(item.subinfo->rect))
                item.subinfo->paintSeparators(p, widget, clip, mouse);
        }

        if (next == -1)
            break;
        QRect r = separatorRect(i);
        if (clip.contains(r))
            paintSep(p, widget, r, o, r.contains(mouse));
    }
}

int QDockAreaLayoutInfo::next(int index) const
{
    for (int i = index + 1; i < item_list.size(); ++i) {
        if (!item_list.at(i).skip())
            return i;
    }
    return -1;
}

int QDockAreaLayoutInfo::prev(int index) const
{
    for (int i = index - 1; i >= 0; --i) {
        if (!item_list.at(i).skip())
            return i;
    }
    return -1;
}

void QDockAreaLayoutInfo::tab(int index, QWidgetItem *dockWidgetItem)
{
#ifndef QT_NO_TABBAR
    if (tabbed) {
        item_list.append(QDockAreaLayoutItem(dockWidgetItem));
    } else {
        QDockAreaLayoutInfo *new_info
            = new QDockAreaLayoutInfo(sep, o, tabBarShape, mainWindow);
        item_list[index].subinfo = new_info;
        new_info->item_list.append(item_list.at(index).widgetItem);
        item_list[index].widgetItem = 0;
        new_info->item_list.append(dockWidgetItem);
        new_info->tabbed = true;
    }
#endif // QT_NO_TABBAR
}

void QDockAreaLayoutInfo::split(int index, Qt::Orientation orientation,
                                       QWidgetItem *dockWidgetItem)
{
    if (orientation == o) {
        item_list.insert(index + 1, QDockAreaLayoutItem(dockWidgetItem));
    } else {
#ifdef QT_NO_TABBAR
        const int tabBarShape = 0;
#endif
        QDockAreaLayoutInfo *new_info
            = new QDockAreaLayoutInfo(sep, orientation, tabBarShape, mainWindow);
        item_list[index].subinfo = new_info;
        new_info->item_list.append(item_list.at(index).widgetItem);
        item_list[index].widgetItem = 0;
        new_info->item_list.append(dockWidgetItem);
    }
}

QDockAreaLayoutItem &QDockAreaLayoutInfo::item(QList<int> path)
{
    Q_ASSERT(!path.isEmpty());
    if (path.count() > 1) {
        QDockAreaLayoutItem &item = item_list[path.takeFirst()];
        Q_ASSERT(item.subinfo != 0);
        return item.subinfo->item(path);
    }
    return item_list[path.first()];
}

QLayoutItem *QDockAreaLayoutInfo::itemAt(int *x, int index) const
{
    for (int i = 0; i < item_list.count(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);
        if (item.subinfo) {
            if (QLayoutItem *ret = item.subinfo->itemAt(x, index))
                return ret;
        } else if (item.widgetItem) {
            if ((*x)++ == index)
                return item.widgetItem;
        }
    }
    return 0;
}

QLayoutItem *QDockAreaLayoutInfo::takeAt(int *x, int index)
{
    for (int i = 0; i < item_list.count(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);
        if (item.subinfo) {
            if (QLayoutItem *ret = item.subinfo->takeAt(x, index)) {
                unnest(i);
                return ret;
            }
        } else if (item.widgetItem) {
            if ((*x)++ == index) {
                QLayoutItem *ret = item.widgetItem;
                item_list.removeAt(i);
                return ret;
            }
        }
    }
    return 0;
}

void QDockAreaLayoutInfo::deleteAllLayoutItems()
{
    for (int i = 0; i < item_list.count(); ++i) {
        QDockAreaLayoutItem &item= item_list[i];
        if (item.subinfo) {
            item.subinfo->deleteAllLayoutItems();
        } else {
            delete item.widgetItem;
            item.widgetItem = 0;
        }
    }
}

void QDockAreaLayoutInfo::saveState(QDataStream &stream) const
{
#ifndef QT_NO_TABBAR
    if (tabbed) {
        stream << (uchar) TabMarker;

        // write the index in item_list of the widget that's currently on top.
        quintptr id = currentTabId();
        int index = -1;
        for (int i = 0; i < item_list.count(); ++i) {
            if (tabId(item_list.at(i)) == id) {
                index = i;
                break;
            }
        }
        stream << index;
    } else
#endif // QT_NO_TABBAR
    {
        stream << (uchar) SequenceMarker;
    }

    stream << (uchar) o << item_list.count();

    for (int i = 0; i < item_list.count(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);
        if (item.widgetItem != 0) {
            stream << (uchar) WidgetMarker;
            QWidget *w = item.widgetItem->widget();
            QString name = w->objectName();
            if (name.isEmpty()) {
                qWarning("QMainWindow::saveState(): 'objectName' not set for QDockWidget %p '%s;",
                         w, qPrintable(w->windowTitle()));
            }
            stream << name;

            uchar flags = 0;
            if (!w->isHidden())
                flags |= StateFlagVisible;
            if (w->isWindow())
                flags |= StateFlagFloating;
            stream << flags;

            if (w->isWindow()) {
                stream << w->x() << w->y() << w->width() << w->height();
            } else {
                stream << item.pos << item.size << pick(o, item.minimumSize())
                        << pick(o, item.maximumSize());
            }
        } else if (item.subinfo != 0) {
            stream << (uchar) SequenceMarker << item.pos << item.size << pick(o, item.minimumSize()) << pick(o, item.maximumSize());
            item.subinfo->saveState(stream);
        }
    }
}

bool QDockAreaLayoutInfo::restoreState(QDataStream &stream, const QList<QDockWidget*> &widgets)
{
    uchar marker;
    stream >> marker;
    if (marker != TabMarker && marker != SequenceMarker)
        return false;

#ifndef QT_NO_TABBAR
    tabbed = marker == TabMarker;

    int index = -1;
    if (tabbed)
        stream >> index;
#endif

    uchar orientation;
    stream >> orientation;
    o = static_cast<Qt::Orientation>(orientation);

    int cnt;
    stream >> cnt;

    for (int i = 0; i < cnt; ++i) {
        uchar nextMarker;
        stream >> nextMarker;
        if (nextMarker == WidgetMarker) {
            QString name;
            uchar flags;
            stream >> name >> flags;
            if (name.isEmpty()) {
                qWarning("QMainWindow::restoreState: Cannot restore "
                         "a QDockWidget with an empty 'objectName'");
                int dummy;
                stream >> dummy >> dummy >> dummy >> dummy;
                continue;
            }

            QDockWidget *widget = 0;
            for (int j = 0; j < widgets.count(); ++j) {
                if (widgets.at(j)->objectName() == name) {
                    widget = widgets.at(j);
                    break;
                }
            }
            if (widget == 0) {
                qWarning("QMainWindow::restoreState(): cannot find a QDockWidget with "
                         "matching 'objectName' (looking for \"%s\").",
                         qPrintable(name));
                int dummy;
                stream >> dummy >> dummy >> dummy >> dummy;
                continue;
            }

            QDockAreaLayoutItem item(new QWidgetItem(widget));
            if (flags & StateFlagFloating) {
                widget->hide();
                widget->setFloating(true);
                int x, y, w, h;
                stream >> x >> y >> w >> h;
                widget->move(x, y);
                widget->resize(w, h);
                widget->setVisible(flags & StateFlagVisible);
            } else {
                int dummy;
                stream >> item.pos >> item.size >> dummy >> dummy;
                widget->setFloating(false);
                widget->setVisible(flags & StateFlagVisible);
            }

            item_list.append(item);
        } else if (nextMarker == SequenceMarker) {
            int dummy;
#ifdef QT_NO_TABBAR
            const int tabBarShape = 0;
#endif
            QDockAreaLayoutInfo *info = new QDockAreaLayoutInfo(sep, o,
                                                                tabBarShape, mainWindow);
            QDockAreaLayoutItem item(info);
            stream >> item.pos >> item.size >> dummy >> dummy;
            if (!info->restoreState(stream, widgets))
                return false;

            item_list.append(item);
        } else {
            return false;
        }
    }

#ifndef QT_NO_TABBAR
    if (tabbed && index >= 0 && index < item_list.count()) {
        updateTabBar();
        setCurrentTabId(tabId(item_list.at(index)));
    }
#endif

    return true;
}

#ifndef QT_NO_TABBAR
void QDockAreaLayoutInfo::updateTabBar() const
{
    if (!tabbed)
        return;

    QDockAreaLayoutInfo *that = const_cast<QDockAreaLayoutInfo*>(this);

    if (tabBar == 0) {
        that->tabBar = mainWindowLayout()->getTabBar();
        that->tabBar->setShape(static_cast<QTabBar::Shape>(tabBarShape));
    }

    bool blocked = tabBar->blockSignals(true);
    bool gap = false;

    int tab_idx = 0;
    bool changed = false;
    for (int i = 0; i < item_list.count(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);
        if (item.skip())
            continue;
        if (item.gap) {
            gap = true;
            continue;
        }
        if (item.widgetItem == 0)
            continue;

        QString title = item.widgetItem->widget()->windowTitle();
        quintptr id = tabId(item);
        if (tab_idx == tabBar->count()) {
            tabBar->insertTab(tab_idx, title);
#ifndef QT_NO_TOOLTIP
            tabBar->setTabToolTip(tab_idx, title);
#endif
            tabBar->setTabData(tab_idx, id);
            changed = true;
        } else if (qvariant_cast<quintptr>(tabBar->tabData(tab_idx)) != id) {
            if (tab_idx + 1 < tabBar->count()
                    && qvariant_cast<quintptr>(tabBar->tabText(tab_idx + 1)) == id)
                tabBar->removeTab(tab_idx);
            else {
                tabBar->insertTab(tab_idx, title);
#ifndef QT_NO_TOOLTIP
                tabBar->setTabToolTip(tab_idx, title);
#endif
                tabBar->setTabData(tab_idx, id);
            }
            changed = true;
        }

        if (title != tabBar->tabText(tab_idx)) {
            tabBar->setTabText(tab_idx, title);
#ifndef QT_NO_TOOLTIP
            tabBar->setTabToolTip(tab_idx, title);
#endif
            changed = true;
        }

        ++tab_idx;
    }

    while (tab_idx < tabBar->count()) {
        tabBar->removeTab(tab_idx);
        changed = true;
    }

    tabBar->blockSignals(blocked);

    that->tabBarVisible = gap || tabBar->count() > 1;

    if (changed) {
        that->tabBarMin = tabBar->minimumSizeHint();
        that->tabBarHint = tabBar->sizeHint();
    }
}

QSize QDockAreaLayoutInfo::tabBarMinimumSize() const
{
    if (!tabbed)
        return QSize(0, 0);

    updateTabBar();

    return tabBarMin;
}

QSize QDockAreaLayoutInfo::tabBarSizeHint() const
{
    if (!tabbed)
        return QSize(0, 0);

    updateTabBar();

    return tabBarHint;
}

QSet<QTabBar*> QDockAreaLayoutInfo::usedTabBars() const
{
    QSet<QTabBar*> result;

    if (tabbed) {
        updateTabBar();
        result.insert(tabBar);
    }

    for (int i = 0; i < item_list.count(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);
        if (item.skip())
            continue;
        if (item.subinfo != 0)
            result += item.subinfo->usedTabBars();
    }

    return result;
}

QRect QDockAreaLayoutInfo::tabContentRect() const
{
    if (!tabbed)
        return QRect();

    QRect result = rect;
    QSize tbh = tabBarSizeHint();

    if (tabBarVisible) {
        switch (tabBarShape) {
            case QTabBar::RoundedNorth:
                result.adjust(0, tbh.height(), 0, 0);
                break;
            case QTabBar::RoundedSouth:
                result.adjust(0, 0, 0, -tbh.height());
                break;
            case QTabBar::RoundedEast:
                result.adjust(0, 0, -tbh.width(), 0);
                break;
            case QTabBar::RoundedWest:
                result.adjust(tbh.width(), 0, 0, 0);
                break;
            default:
                break;
        }
    }

    return result;
}
#endif // QT_NO_TABBAR

/******************************************************************************
** QDockWidgetLayout
*/

QDockWidgetLayout::QDockWidgetLayout(QMainWindow *win)
{
    mainWindow = win;
    sep = win->style()->pixelMetric(QStyle::PM_DockWidgetSeparatorExtent);
#ifndef QT_NO_TABBAR
    const int tabShape = QTabBar::RoundedSouth;
#else
    const int tabShape = 0;
#endif
    docks[LeftPos] = QDockAreaLayoutInfo(sep, Qt::Vertical, tabShape, win);
    docks[RightPos] = QDockAreaLayoutInfo(sep, Qt::Vertical, tabShape, win);
    docks[TopPos] = QDockAreaLayoutInfo(sep, Qt::Horizontal, tabShape, win);
    docks[BottomPos] = QDockAreaLayoutInfo(sep, Qt::Horizontal, tabShape, win);
    centralWidgetItem = 0;
    centralWidgetRect = QRect(0, 0, -1, -1);

    corners[Qt::TopLeftCorner] = Qt::TopDockWidgetArea;
    corners[Qt::TopRightCorner] = Qt::TopDockWidgetArea;
    corners[Qt::BottomLeftCorner] = Qt::BottomDockWidgetArea;
    corners[Qt::BottomRightCorner] = Qt::BottomDockWidgetArea;
}

bool QDockWidgetLayout::isValid() const
{
    return rect.isValid();
}

void QDockWidgetLayout::saveState(QDataStream &stream) const
{
    stream << (uchar) DockWidgetStateMarker;
    int cnt = 0;
    for (int i = 0; i < PosCount; ++i) {
        if (!docks[i].item_list.isEmpty())
            ++cnt;
    }
    stream << cnt;
    for (int i = 0; i < PosCount; ++i) {
        if (docks[i].item_list.isEmpty())
            continue;
        stream << i << docks[i].rect.size();
        docks[i].saveState(stream);
    }

    stream << centralWidgetRect.size();

    for (int i = 0; i < 4; ++i)
        stream << static_cast<int>(corners[i]);
}

bool QDockWidgetLayout::restoreState(QDataStream &stream, const QList<QDockWidget*> &dockwidgets)
{
    uchar dmarker;
    stream >> dmarker;
    if (dmarker != DockWidgetStateMarker)
        return false;
    int cnt;
    stream >> cnt;
    for (int i = 0; i < cnt; ++i) {
        int pos;
        stream >> pos;
        QSize size;
        stream >> size;
        docks[pos].rect = QRect(QPoint(0, 0), size);
        if (!docks[pos].restoreState(stream, dockwidgets)) {
            stream.setStatus(QDataStream::ReadCorruptData);
            return false;
        }
    }

    QSize size;
    stream >> size;
    centralWidgetRect = QRect(QPoint(0, 0), size);

    bool ok = stream.status() == QDataStream::Ok;

    if (ok) {
        int cornerData[4];
        for (int i = 0; i < 4; ++i)
            stream >> cornerData[i];
        if (stream.status() == QDataStream::Ok) {
            for (int i = 0; i < 4; ++i)
                corners[i] = static_cast<Qt::DockWidgetArea>(cornerData[i]);
        }
    }

    return ok;
}

QList<int> QDockWidgetLayout::indexOf(QDockWidget *dockWidget, IndexOfFlag flag) const
{
    for (int i = 0; i < PosCount; ++i) {
        QList<int> result = docks[i].indexOf(dockWidget, flag);
        if (!result.isEmpty()) {
            result.prepend(i);
            return result;
        }
    }
    return QList<int>();
}

QList<int> QDockWidgetLayout::gapIndex(const QPoint &pos, bool nestingEnabled) const
{
    for (int i = 0; i < PosCount; ++i) {
        const QDockAreaLayoutInfo &info = docks[i];

        if (!info.isEmpty() && info.rect.contains(pos)) {
            QList<int> result = docks[i].gapIndex(pos, nestingEnabled);
            if (!result.isEmpty())
                result.prepend(i);
            return result;
        }
    }

    for (int i = 0; i < PosCount; ++i) {
        const QDockAreaLayoutInfo &info = docks[i];

        if (info.isEmpty()) {
            QRect r;
            switch (i) {
                case LeftPos:
                    r = QRect(rect.left(), rect.top(), EmptyDropAreaSize, rect.height());
                    break;
                case RightPos:
                    r = QRect(rect.right() - EmptyDropAreaSize, rect.top(),
                                EmptyDropAreaSize, rect.height());
                    break;
                case TopPos:
                    r = QRect(rect.left(), rect.top(), rect.width(), EmptyDropAreaSize);
                    break;
                case BottomPos:
                    r = QRect(rect.left(), rect.bottom() - EmptyDropAreaSize,
                                rect.width(), EmptyDropAreaSize);
                    break;
            }
            if (r.contains(pos))
                return QList<int>() << i << 0;
        }
    }

    return QList<int>();
}

QList<int> QDockWidgetLayout::findSeparator(const QPoint &pos) const
{
    QList<int> result;
    for (int i = 0; i < PosCount; ++i) {
        const QDockAreaLayoutInfo &info = docks[i];
        if (info.isEmpty())
            continue;
        if (separatorRect(i).contains(pos)) {
            result << i;
            break;
        } else if (info.rect.contains(pos)) {
            result = docks[i].findSeparator(pos);
            if (!result.isEmpty()) {
                result.prepend(i);
                break;
            }
        }
    }

    return result;
}

QDockAreaLayoutInfo *QDockWidgetLayout::info(QWidget *widget)
{
    for (int i = 0; i < PosCount; ++i) {
        if (QDockAreaLayoutInfo *result = docks[i].info(widget))
            return result;
    }

    return 0;
}

QDockAreaLayoutInfo *QDockWidgetLayout::info(QList<int> path)
{
    Q_ASSERT(!path.isEmpty());
    int index = path.takeFirst();
    Q_ASSERT(index >= 0 && index < PosCount);

    if (path.isEmpty())
        return &docks[index];

    return docks[index].info(path);
}

QDockAreaLayoutItem &QDockWidgetLayout::item(QList<int> path)
{
    Q_ASSERT(!path.isEmpty());
    int index = path.takeFirst();
    Q_ASSERT(index >= 0 && index < PosCount);
    return docks[index].item(path);
}

QRect QDockWidgetLayout::itemRect(QList<int> path) const
{
    Q_ASSERT(!path.isEmpty());
    int index = path.takeFirst();
    Q_ASSERT(index >= 0 && index < PosCount);
    return docks[index].itemRect(path);
}

QRect QDockWidgetLayout::separatorRect(int index) const
{
    if (docks[index].isEmpty())
        return QRect();
    QRect r = docks[index].rect;
    switch (index) {
        case LeftPos:
            return QRect(r.right() + 1, r.top(), sep, r.height());
        case RightPos:
            return QRect(r.left() - sep, r.top(), sep, r.height());
        case TopPos:
            return QRect(r.left(), r.bottom() + 1, r.width(), sep);
        case BottomPos:
            return QRect(r.left(), r.top() - sep, r.width(), sep);
        default:
            break;
    }
    return QRect();
}

QRect QDockWidgetLayout::separatorRect(QList<int> path) const
{
    Q_ASSERT(!path.isEmpty());

    int index = path.takeFirst();
    Q_ASSERT(index >= 0 && index < PosCount);

    if (path.isEmpty())
        return separatorRect(index);
    else
        return docks[index].separatorRect(path);
}

bool QDockWidgetLayout::insertGap(QList<int> path, QWidgetItem *dockWidgetItem)
{
    Q_ASSERT(!path.isEmpty());
    int index = path.takeFirst();
    Q_ASSERT(index >= 0 && index < PosCount);
    return docks[index].insertGap(path, dockWidgetItem);
}

QRect QDockWidgetLayout::convertToWidget(QList<int> path, QWidgetItem *dockWidgetItem)
{
    Q_ASSERT(!path.isEmpty());
    int index = path.takeFirst();
    Q_ASSERT(index >= 0 && index < PosCount);
    return docks[index].convertToWidget(path, dockWidgetItem);
}

QWidgetItem *QDockWidgetLayout::convertToGap(QList<int> path)
{
    Q_ASSERT(!path.isEmpty());
    int index = path.takeFirst();
    Q_ASSERT(index >= 0 && index < PosCount);
    return docks[index].convertToGap(path);
}

void QDockWidgetLayout::remove(QList<int> path)
{
    Q_ASSERT(!path.isEmpty());
    int index = path.takeFirst();
    Q_ASSERT(index >= 0 && index < PosCount);
    docks[index].remove(path);
}

static inline int qMin(int i1, int i2, int i3) { return qMin(i1, qMin(i2, i3)); }
static inline int qMax(int i1, int i2, int i3) { return qMax(i1, qMax(i2, i3)); }

void QDockWidgetLayout::getGrid(QVector<QLayoutStruct> *_ver_struct_list,
                                QVector<QLayoutStruct> *_hor_struct_list)
{
    QSize center_hint(0, 0);
    QSize center_min(0, 0);
    bool have_central = centralWidgetItem != 0 && !centralWidgetItem->isEmpty();
    if (have_central) {
        center_hint = centralWidgetRect.size();
        if (!center_hint.isValid())
            center_hint = centralWidgetItem->sizeHint();
        center_min = centralWidgetItem->minimumSize();
    }

    QRect center_rect = rect;
    if (!docks[LeftPos].isEmpty())
        center_rect.setLeft(rect.left() + docks[LeftPos].rect.width() + sep);
    if (!docks[TopPos].isEmpty())
        center_rect.setTop(rect.top() + docks[TopPos].rect.height() + sep);
    if (!docks[RightPos].isEmpty())
        center_rect.setRight(rect.right() - docks[RightPos].rect.width() - sep - 1);
    if (!docks[BottomPos].isEmpty())
        center_rect.setBottom(rect.bottom() - docks[BottomPos].rect.height() - sep - 1);

    QSize left_hint = docks[LeftPos].size();
    if (!left_hint.isValid())
        left_hint = docks[LeftPos].sizeHint();
    QSize left_min = docks[LeftPos].minimumSize();
    QSize left_max = docks[LeftPos].maximumSize();
    int left_sep = docks[LeftPos].isEmpty() ? 0 : sep;

    QSize right_hint = docks[RightPos].size();
    if (!right_hint.isValid())
        right_hint = docks[RightPos].sizeHint();
    QSize right_min = docks[RightPos].minimumSize();
    QSize right_max = docks[RightPos].maximumSize();
    int right_sep = docks[RightPos].isEmpty() ? 0 : sep;

    QSize top_hint = docks[TopPos].size();
    if (!top_hint.isValid())
        top_hint = docks[TopPos].sizeHint();
    QSize top_min = docks[TopPos].minimumSize();
    QSize top_max = docks[TopPos].maximumSize();
    int top_sep = docks[TopPos].isEmpty() ? 0 : sep;

    QSize bottom_hint = docks[BottomPos].size();
    if (!bottom_hint.isValid())
        bottom_hint = docks[BottomPos].sizeHint();
    QSize bottom_min = docks[BottomPos].minimumSize();
    QSize bottom_max = docks[BottomPos].maximumSize();
    int bottom_sep = docks[BottomPos].isEmpty() ? 0 : sep;

    if (_ver_struct_list != 0) {
        QVector<QLayoutStruct> &ver_struct_list = *_ver_struct_list;
        ver_struct_list.resize(3);

        // top --------------------------------------------------

        ver_struct_list[0].stretch = 0;
        ver_struct_list[0].sizeHint = top_hint.height();
        ver_struct_list[0].minimumSize = top_min.height();
        ver_struct_list[0].maximumSize = top_max.height();
        ver_struct_list[0].expansive = false;
        ver_struct_list[0].empty = docks[TopPos].isEmpty();
        ver_struct_list[0].pos = docks[TopPos].rect.top();
        ver_struct_list[0].size = docks[TopPos].rect.height();

        // center --------------------------------------------------

        ver_struct_list[1].stretch = center_hint.height();
        int left = left_hint.height();
        if (corners[Qt::TopLeftCorner] == Qt::LeftDockWidgetArea)
            left -= top_hint.height() + top_sep;
        if (corners[Qt::BottomLeftCorner] == Qt::LeftDockWidgetArea)
            left -= bottom_hint.height() + bottom_sep;
        int right = right_hint.height();
        if (corners[Qt::TopRightCorner] == Qt::RightDockWidgetArea)
            right -= top_hint.height() + top_sep;
        if (corners[Qt::BottomRightCorner] == Qt::RightDockWidgetArea)
            right -= bottom_hint.height() + bottom_sep;
        ver_struct_list[1].sizeHint = qMax(left, center_hint.height(), right);

        left = left_min.height();
        if (corners[Qt::TopLeftCorner] == Qt::LeftDockWidgetArea)
            left -= top_min.height() + top_sep;
        if (corners[Qt::BottomLeftCorner] == Qt::LeftDockWidgetArea)
            left -= bottom_min.height() + bottom_sep;
        right = right_min.height();
        if (corners[Qt::TopRightCorner] == Qt::RightDockWidgetArea)
            right -= top_min.height() + top_sep;
        if (corners[Qt::BottomRightCorner] == Qt::RightDockWidgetArea)
            right -= bottom_min.height() + bottom_sep;
        ver_struct_list[1].minimumSize = qMax(left, center_min.height(), right);
        ver_struct_list[1].maximumSize = have_central ? QWIDGETSIZE_MAX : 0;
        ver_struct_list[1].expansive = have_central;
        ver_struct_list[1].empty = docks[LeftPos].isEmpty()
                                        && !have_central
                                        && docks[RightPos].isEmpty();
        ver_struct_list[1].pos = center_rect.top();
        ver_struct_list[1].size = center_rect.height();

        // bottom --------------------------------------------------

        ver_struct_list[2].stretch = 0;
        ver_struct_list[2].sizeHint = bottom_hint.height();
        ver_struct_list[2].minimumSize = bottom_min.height();
        ver_struct_list[2].maximumSize = bottom_max.height();
        ver_struct_list[2].expansive = false;
        ver_struct_list[2].empty = docks[BottomPos].isEmpty();
        ver_struct_list[2].pos = docks[BottomPos].rect.top();
        ver_struct_list[2].size = docks[BottomPos].rect.height();

        for (int i = 0; i < 3; ++i) {
            ver_struct_list[i].sizeHint
                = qMax(ver_struct_list[i].sizeHint, ver_struct_list[i].minimumSize);
        }
    }

    if (_hor_struct_list != 0) {
        QVector<QLayoutStruct> &hor_struct_list = *_hor_struct_list;
        hor_struct_list.resize(3);

        // left --------------------------------------------------

        hor_struct_list[0].stretch = 0;
        hor_struct_list[0].sizeHint = left_hint.width();
        hor_struct_list[0].minimumSize = left_min.width();
        hor_struct_list[0].maximumSize = left_max.width();
        hor_struct_list[0].expansive = false;
        hor_struct_list[0].empty = docks[LeftPos].isEmpty();
        hor_struct_list[0].pos = docks[LeftPos].rect.left();
        hor_struct_list[0].size = docks[LeftPos].rect.width();

        // center --------------------------------------------------

        hor_struct_list[1].stretch = center_hint.width();
        int top = top_hint.width();
        if (corners[Qt::TopLeftCorner] == Qt::TopDockWidgetArea)
            top -= left_hint.width() + left_sep;
        if (corners[Qt::TopRightCorner] == Qt::TopDockWidgetArea)
            top -= right_hint.width() + right_sep;
        int bottom = bottom_hint.width();
        if (corners[Qt::BottomLeftCorner] == Qt::BottomDockWidgetArea)
            bottom -= left_hint.width() + left_sep;
        if (corners[Qt::BottomRightCorner] == Qt::BottomDockWidgetArea)
            bottom -= right_hint.width() + right_sep;
        hor_struct_list[1].sizeHint = qMax(top, center_hint.width(), bottom);

        top = top_min.width();
        if (corners[Qt::TopLeftCorner] == Qt::TopDockWidgetArea)
            top -= left_min.width() + left_sep;
        if (corners[Qt::TopRightCorner] == Qt::TopDockWidgetArea)
            top -= right_min.width() + right_sep;
        bottom = bottom_min.width();
        if (corners[Qt::BottomLeftCorner] == Qt::BottomDockWidgetArea)
            bottom -= left_min.width() + left_sep;
        if (corners[Qt::BottomRightCorner] == Qt::BottomDockWidgetArea)
            bottom -= right_min.width() + right_sep;
        hor_struct_list[1].minimumSize = qMax(top, center_min.width(), bottom);
        hor_struct_list[1].maximumSize = have_central ? QWIDGETSIZE_MAX : 0;
        hor_struct_list[1].expansive = have_central;
        hor_struct_list[1].empty = !have_central;
        hor_struct_list[1].pos = center_rect.left();
        hor_struct_list[1].size = center_rect.width();

        // right --------------------------------------------------

        hor_struct_list[2].stretch = 0;
        hor_struct_list[2].sizeHint = right_hint.width();
        hor_struct_list[2].minimumSize = right_min.width();
        hor_struct_list[2].maximumSize = right_max.width();
        hor_struct_list[2].expansive = false;
        hor_struct_list[2].empty = docks[RightPos].isEmpty();
        hor_struct_list[2].pos = docks[RightPos].rect.left();
        hor_struct_list[2].size = docks[RightPos].rect.width();

        for (int i = 0; i < 3; ++i) {
            hor_struct_list[i].sizeHint
                = qMax(hor_struct_list[i].sizeHint, hor_struct_list[i].minimumSize);
        }
    }
}

void QDockWidgetLayout::setGrid(QVector<QLayoutStruct> *ver_struct_list,
                                QVector<QLayoutStruct> *hor_struct_list)
{

    // top ---------------------------------------------------

    QRect r = docks[TopPos].rect;
    if (hor_struct_list != 0) {
        r.setLeft(corners[Qt::TopLeftCorner] == Qt::TopDockWidgetArea
                    || docks[LeftPos].isEmpty()
                        ? rect.left() : hor_struct_list->at(1).pos);
        r.setRight(corners[Qt::TopRightCorner] == Qt::TopDockWidgetArea
                    || docks[RightPos].isEmpty()
                        ? rect.right() : hor_struct_list->at(2).pos - sep - 1);
    }
    if (ver_struct_list != 0) {
        r.setTop(rect.top());
        r.setBottom(ver_struct_list->at(1).pos - sep - 1);
    }
    docks[TopPos].rect = r;
    docks[TopPos].fitItems();

    // bottom ---------------------------------------------------

    r = docks[BottomPos].rect;
    if (hor_struct_list != 0) {
        r.setLeft(corners[Qt::BottomLeftCorner] == Qt::BottomDockWidgetArea
                    || docks[LeftPos].isEmpty()
                        ? rect.left() : hor_struct_list->at(1).pos);
        r.setRight(corners[Qt::BottomRightCorner] == Qt::BottomDockWidgetArea
                    || docks[RightPos].isEmpty()
                        ? rect.right() : hor_struct_list->at(2).pos - sep - 1);
    }
    if (ver_struct_list != 0) {
        r.setTop(ver_struct_list->at(2).pos);
        r.setBottom(rect.bottom());
    }
    docks[BottomPos].rect = r;
    docks[BottomPos].fitItems();

    // left ---------------------------------------------------

    r = docks[LeftPos].rect;
    if (hor_struct_list != 0) {
        r.setLeft(rect.left());
        r.setRight(hor_struct_list->at(1).pos - sep - 1);
    }
    if (ver_struct_list != 0) {
        r.setTop(corners[Qt::TopLeftCorner] == Qt::LeftDockWidgetArea
                    || docks[TopPos].isEmpty()
                        ? rect.top() : ver_struct_list->at(1).pos);
        r.setBottom(corners[Qt::BottomLeftCorner] == Qt::LeftDockWidgetArea
                    || docks[BottomPos].isEmpty()
                        ? rect.bottom() : ver_struct_list->at(2).pos - sep - 1);
    }
    docks[LeftPos].rect = r;
    docks[LeftPos].fitItems();

    // right ---------------------------------------------------

    r = docks[RightPos].rect;
    if (hor_struct_list != 0) {
        r.setLeft(hor_struct_list->at(2).pos);
        r.setRight(rect.right());
    }
    if (ver_struct_list != 0) {
        r.setTop(corners[Qt::TopRightCorner] == Qt::RightDockWidgetArea
                    || docks[TopPos].isEmpty()
                        ? rect.top() : ver_struct_list->at(1).pos);
        r.setBottom(corners[Qt::BottomRightCorner] == Qt::RightDockWidgetArea
                    || docks[BottomPos].isEmpty()
                        ? rect.bottom() : ver_struct_list->at(2).pos - sep - 1);
    }
    docks[RightPos].rect = r;
    docks[RightPos].fitItems();

    // center ---------------------------------------------------

    if (hor_struct_list != 0) {
        centralWidgetRect.setLeft(hor_struct_list->at(1).pos);
        centralWidgetRect.setWidth(hor_struct_list->at(1).size);
    }
    if (ver_struct_list != 0) {
        centralWidgetRect.setTop(ver_struct_list->at(1).pos);
        centralWidgetRect.setHeight(ver_struct_list->at(1).size);
    }
}

void QDockWidgetLayout::fitLayout()
{
    QVector<QLayoutStruct> ver_struct_list(3);
    QVector<QLayoutStruct> hor_struct_list(3);
    getGrid(&ver_struct_list, &hor_struct_list);

    qGeomCalc(ver_struct_list, 0, 3, rect.top(), rect.height(), sep);
    qGeomCalc(hor_struct_list, 0, 3, rect.left(), rect.width(), sep);

    setGrid(&ver_struct_list, &hor_struct_list);
}

void QDockWidgetLayout::clear()
{
    for (int i = 0; i < PosCount; ++i)
        docks[i].clear();

    rect = QRect(0, 0, -1, -1);
    centralWidgetRect = QRect(0, 0, -1, -1);
}

QSize QDockWidgetLayout::sizeHint() const
{
    int left_sep = docks[LeftPos].isEmpty() ? 0 : sep;
    int right_sep = docks[RightPos].isEmpty() ? 0 : sep;
    int top_sep = docks[TopPos].isEmpty() ? 0 : sep;
    int bottom_sep = docks[BottomPos].isEmpty() ? 0 : sep;

    QSize left = docks[LeftPos].sizeHint() + QSize(left_sep, 0);
    QSize right = docks[RightPos].sizeHint() + QSize(right_sep, 0);
    QSize top = docks[TopPos].sizeHint() + QSize(0, top_sep);
    QSize bottom = docks[BottomPos].sizeHint() + QSize(0, bottom_sep);
    QSize center = centralWidgetItem == 0 ? QSize(0, 0) : centralWidgetItem->sizeHint();

    int row1 = top.width();
    int row2 = left.width() + center.width() + right.width();
    int row3 = bottom.width();
    int col1 = left.height();
    int col2 = top.height() + center.height() + bottom.height();
    int col3 = right.height();

    if (corners[Qt::TopLeftCorner] == Qt::LeftDockWidgetArea)
        row1 += left.width();
    else
        col1 += top.height();

    if (corners[Qt::TopRightCorner] == Qt::RightDockWidgetArea)
        row1 += right.width();
    else
        col3 += top.height();

    if (corners[Qt::BottomLeftCorner] == Qt::LeftDockWidgetArea)
        row3 += left.width();
    else
        col1 += bottom.height();

    if (corners[Qt::BottomRightCorner] == Qt::RightDockWidgetArea)
        row3 += right.width();
    else
        col3 += bottom.height();

    return QSize(qMax(row1, row2, row3), qMax(col1, col2, col3));
}

QSize QDockWidgetLayout::minimumSize() const
{
    int left_sep = docks[LeftPos].isEmpty() ? 0 : sep;
    int right_sep = docks[RightPos].isEmpty() ? 0 : sep;
    int top_sep = docks[TopPos].isEmpty() ? 0 : sep;
    int bottom_sep = docks[BottomPos].isEmpty() ? 0 : sep;

    QSize left = docks[LeftPos].minimumSize() + QSize(left_sep, 0);
    QSize right = docks[RightPos].minimumSize() + QSize(right_sep, 0);
    QSize top = docks[TopPos].minimumSize() + QSize(0, top_sep);
    QSize bottom = docks[BottomPos].minimumSize() + QSize(0, bottom_sep);
    QSize center = centralWidgetItem == 0 ? QSize(0, 0) : centralWidgetItem->minimumSize();

    int row1 = top.width();
    int row2 = left.width() + center.width() + right.width();
    int row3 = bottom.width();
    int col1 = left.height();
    int col2 = top.height() + center.height() + bottom.height();
    int col3 = right.height();

    if (corners[Qt::TopLeftCorner] == Qt::LeftDockWidgetArea)
        row1 += left.width();
    else
        col1 += top.height();

    if (corners[Qt::TopRightCorner] == Qt::RightDockWidgetArea)
        row1 += right.width();
    else
        col3 += top.height();

    if (corners[Qt::BottomLeftCorner] == Qt::LeftDockWidgetArea)
        row3 += left.width();
    else
        col1 += bottom.height();

    if (corners[Qt::BottomRightCorner] == Qt::RightDockWidgetArea)
        row3 += right.width();
    else
        col3 += bottom.height();

    return QSize(qMax(row1, row2, row3), qMax(col1, col2, col3));
}

void QDockWidgetLayout::addDockWidget(DockPos pos, QDockWidget *dockWidget,
                                             Qt::Orientation orientation)
{
    QWidgetItem *dockWidgetItem = new QWidgetItem(dockWidget);
    QDockAreaLayoutInfo &info = docks[pos];
    if (orientation == info.o || info.isEmpty()) {
        QDockAreaLayoutItem new_item(dockWidgetItem);
        info.item_list.append(new_item);
#ifndef QT_NO_TABBAR
        if (info.tabbed && !new_item.skip()) {
            info.updateTabBar();
            info.setCurrentTabId(tabId(new_item));
        }
#endif
    } else {
#ifndef QT_NO_TABBAR
        int tbshape = QTabBar::RoundedSouth;
        switch (pos) {
            case TopPos:
                tbshape = QTabBar::RoundedNorth;
                break;
            case BottomPos:
                tbshape = QTabBar::RoundedSouth;
                break;
            case RightPos:
                tbshape = QTabBar::RoundedEast;
                break;
            case LeftPos:
                tbshape = QTabBar::RoundedWest;
                break;
            default:
                break;
        }
#else
        int tbshape = 0;
#endif
        QDockAreaLayoutInfo new_info(sep, orientation, tbshape, mainWindow);
        new_info.item_list.append(new QDockAreaLayoutInfo(info));
        new_info.item_list.append(dockWidgetItem);
        info = new_info;
    }
}

void QDockWidgetLayout::tabifyDockWidget(QDockWidget *first, QDockWidget *second)
{
    QList<int> path = indexOf(first);
    if (path.isEmpty())
        return;