src/qt3support/widgets/q3mainwindow.cpp

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/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the Qt3Support 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 "q3mainwindow.h"
#ifndef QT_NO_MAINWINDOW

#include "qapplication.h"
#include "qbitmap.h"
#include "qcursor.h"
#include "qdatetime.h"
#include "q3dockarea.h"
#include "qevent.h"
#include "qlayout.h"
#include "qmap.h"
#include "qmenubar.h"
#include "qpainter.h"
#include "q3popupmenu.h"
#include "q3scrollview.h"
#include "qstatusbar.h"
#include "qstringlist.h"
#include "qstyle.h"
#include "qstyleoption.h"
#include "qtimer.h"
#include "q3toolbar.h"
#include "qtooltip.h"
#include "qwhatsthis.h"
#ifdef Q_WS_MAC
#  include <private/qt_mac_p.h>
#endif

class QHideDock;

#include <private/q3mainwindow_p.h>

/* Q3MainWindowLayout, respects widthForHeight layouts (like the left
  and right docks are)
*/

class Q3MainWindowLayout : public QLayout
{
    Q_OBJECT

public:
    Q3MainWindowLayout(Q3MainWindow *mw, QLayout* parent = 0);
    ~Q3MainWindowLayout() {}

    void addItem(QLayoutItem *);
    void setLeftDock(Q3DockArea *l);
    void setRightDock(Q3DockArea *r);
    void setCentralWidget(QWidget *w);
    bool hasHeightForWidth() const { return false; }
    QSize sizeHint() const;
    QSize minimumSize() const;
    QLayoutItem *itemAt(int) const { return 0; } //###
    QLayoutItem *takeAt(int) { return 0; } //###
    int count() const { return 0; } //###

protected:
    void setGeometry(const QRect &r) {
        QLayout::setGeometry(r);
        layoutItems(r);
    }

private:
    int layoutItems(const QRect&, bool testonly = false);
    int extraPixels() const;

    Q3DockArea *left, *right;
    QWidget *central;
    Q3MainWindow *mainWindow;

};

QSize Q3MainWindowLayout::sizeHint() const
{
    int w = 0;
    int h = 0;

    if (left) {
        w += left->sizeHint().width();
        h = qMax(h, left->sizeHint().height());
    }
    if (right) {
        w += right->sizeHint().width();
        h = qMax(h, right->sizeHint().height());
    }
    if (central) {
        w += central->sizeHint().width();
        int diff = extraPixels();
        h = qMax(h, central->sizeHint().height() + diff);
    }
    return QSize(w, h);
}

QSize Q3MainWindowLayout::minimumSize() const
{
    int w = 0;
    int h = 0;

    if (left) {
        QSize ms = left->minimumSizeHint().expandedTo(left->minimumSize());
        w += ms.width();
        h = qMax(h, ms.height());
    }
    if (right) {
        QSize ms = right->minimumSizeHint().expandedTo(right->minimumSize());
        w += ms.width();
        h = qMax(h, ms.height());
    }
    if (central) {
        QSize min = central->minimumSize().isNull() ?
                    central->minimumSizeHint() : central->minimumSize();
        w += min.width();
        int diff = extraPixels();
        h = qMax(h, min.height() + diff);
    }
    return QSize(w, h);
}

Q3MainWindowLayout::Q3MainWindowLayout(Q3MainWindow *mw, QLayout* parent)
    : QLayout(parent), left(0), right(0), central(0)
{
    mainWindow = mw;
}

void Q3MainWindowLayout::setLeftDock(Q3DockArea *l)
{
    left = l;
}

void Q3MainWindowLayout::setRightDock(Q3DockArea *r)
{
    right = r;
}

void Q3MainWindowLayout::setCentralWidget(QWidget *w)
{
    central = w;
}

int Q3MainWindowLayout::layoutItems(const QRect &r, bool testonly)
{
    if (!left && !central && !right)
        return 0;

    int wl = 0, wr = 0;
    if (left)
        wl = ((Q3DockAreaLayout*)left->QWidget::layout())->widthForHeight(r.height());
    if (right)
        wr = ((Q3DockAreaLayout*)right->QWidget::layout())->widthForHeight(r.height());
    int w = r.width() - wr - wl;
    if (w < 0)
        w = 0;

    int diff = extraPixels();
    if (!testonly) {
        QRect g(geometry());
        if (left)
            left->setGeometry(QRect(g.x(), g.y() + diff, wl, r.height() - diff));
        if (right)
            right->setGeometry(QRect(g.x() + g.width() - wr, g.y() + diff, wr, r.height() - diff));
        if (central)
            central->setGeometry(g.x() + wl, g.y() + diff, w, r.height() - diff);
    }

    w = wl + wr;
    if (central)
        w += central->minimumSize().width();
    return w;
}

int Q3MainWindowLayout::extraPixels() const
{
    if (mainWindow->d_func()->topDock->isEmpty() &&
         !(mainWindow->d_func()->leftDock->isEmpty() &&
           mainWindow->d_func()->rightDock->isEmpty())) {
        return 2;
    } else {
        return 0;
    }
}

void Q3MainWindowLayout::addItem(QLayoutItem * /* item */)
{
}

/*
  QHideToolTip and QHideDock - minimized dock
*/

#if 0
class QHideToolTip : public QToolTip
{
public:
    QHideToolTip(QWidget *parent) : QToolTip(parent) {}

    void maybeTip(const QPoint &pos);
};
#endif


class QHideDock : public QWidget
{
    Q_OBJECT

public:
    QHideDock(Q3MainWindow *parent) : QWidget(parent, "qt_hide_dock") {
        hide();
        setFixedHeight(style()->pixelMetric(QStyle::PM_DockWidgetHandleExtent, 0, this) + 3);
        pressedHandle = -1;
        pressed = false;
        setMouseTracking(true);
        win = parent;
#if 0
        tip = new QHideToolTip(this);
#endif
    }
    ~QHideDock()
    {
#if 0
        delete tip;
#endif
    }

protected:
    void paintEvent(QPaintEvent *e) {
        QObjectList childList = children();
        if (childList.isEmpty())
            return;
        QPainter p(this);
        p.setClipRegion(e->rect());
        p.fillRect(e->rect(), palette().brush(QPalette::Window));
        int x = 0;
        for (int i = 0; i < childList.size(); ++i) {
            QObject *o = childList.at(i);
            Q3DockWindow *dw = qobject_cast<Q3DockWindow*>(o);
            if (!dw || !dw->isVisible())
                continue;
            QStyleOptionQ3DockWindow opt;
            opt.rect.setRect(x, 0, 30, 10);
            opt.palette = palette();
            opt.docked = dw->area();
            opt.closeEnabled = dw->isCloseEnabled();
            opt.state = QStyle::State_None;
            if (i == pressedHandle)
                opt.state |= QStyle::State_On;

            style()->drawPrimitive(QStyle::PE_IndicatorToolBarHandle, &opt, &p, this);
            x += 30;
        }
    }

    void mousePressEvent(QMouseEvent *e) {
        pressed = true;
        QObjectList childList = children();
        if (childList.isEmpty())
            return;
        mouseMoveEvent(e);
        pressedHandle = -1;

        if (e->button() == Qt::RightButton && win->isDockMenuEnabled()) {
            // ### TODO: HideDock menu
        } else {
            mouseMoveEvent(e);
        }
    }

    void mouseMoveEvent(QMouseEvent *e) {
        QObjectList childList = children();
        if (childList.isEmpty())
            return;
        if (!pressed)
            return;
        int x = 0;
        if (e->y() >= 0 && e->y() <= height()) {
            for (int i = 0; i < childList.size(); ++i) {
                QObject *o = childList.at(i);
                Q3DockWindow *dw = qobject_cast<Q3DockWindow*>(o);
                if (!dw || !dw->isVisible())
                    continue;
                if (e->x() >= x && e->x() <= x + 30) {
                    int old = pressedHandle;
                    pressedHandle = i;
                    if (pressedHandle != old)
                        repaint();
                    return;
                }
                x += 30;
            }
        }
        int old = pressedHandle;
        pressedHandle = -1;
        if (old != -1)
            repaint();
    }

    void mouseReleaseEvent(QMouseEvent *e) {
        pressed = false;
        if (pressedHandle == -1)
            return;
        QObjectList childList = children();
        if (childList.isEmpty())
            return;
        if (e->button() == Qt::LeftButton) {
            if (e->y() >= 0 && e->y() <= height()) {
                QObject *o = childList.at(pressedHandle);
                Q3DockWindow *dw = qobject_cast<Q3DockWindow*>(o);
                if (dw) {
                    dw->show();
                    dw->dock();
                }
            }
        }
        pressedHandle = -1;
        repaint();
    }

    bool eventFilter(QObject *o, QEvent *e) {
        if (o == this || !o->isWidgetType())
            return QWidget::eventFilter(o, e);
        if (e->type() == QEvent::HideToParent ||
             e->type() == QEvent::ShowToParent)
            updateState();
        return QWidget::eventFilter(o, e);
    }

    void updateState() {
        bool visible = true;
        QObjectList childList = children();
        if (childList.isEmpty())
            return;
        for (int i = 0; i < childList.size(); ++i) {
            QObject *o = childList.at(i);
            Q3DockWindow *dw = qobject_cast<Q3DockWindow*>(o);
            if (!dw)
                continue;
            if (dw->isHidden()) {
                visible = false;
                continue;
            }
            if (!dw->isVisible())
                continue;
            visible = true;
            break;
        }

        if (visible)
            show();
        else
            hide();
        win->triggerLayout(false);
        update();
    }

    void childEvent(QChildEvent *e) {
        QWidget::childEvent(e);
        if (e->type() == QEvent::ChildInserted)
            e->child()->installEventFilter(this);
        else
            e->child()->removeEventFilter(this);
        updateState();
    }

private:
    Q3MainWindow *win;
    int pressedHandle;
    bool pressed;
#if 0
    QHideToolTip *tip;
    friend class QHideToolTip;
#endif
};

#if 0
void QHideToolTip::maybeTip(const QPoint &pos)
{
    if (!parentWidget())
        return;
    QHideDock *dock = (QHideDock*)parentWidget();

    QObjectList dchilds = dock->children();
    if (dchilds.isEmpty())
        return;
    int x = 0;
    for (int i = 0; i < dchilds.size(); ++i) {
        QObject *o = dchilds.at(i);
        Q3DockWindow *dw = qobject_cast<Q3DockWindow*>(o);
        if (!dw || !dw->isVisible())
            continue;
        if (pos.x() >= x && pos.x() <= x + 30) {
            Q3DockWindow *dw = (Q3DockWindow*)o;
            if (!dw->windowTitle().isEmpty())
                tip(QRect(x, 0, 30, dock->height()), dw->windowTitle());
            return;
        }
        x += 30;
    }
}
#endif

Q3MainWindow::Q3MainWindow(QWidget * parent, const char * name, Qt::WindowFlags f)
    : QWidget(*new Q3MainWindowPrivate, parent, f)
{
    Q_D(Q3MainWindow);
    setObjectName(name);
#ifdef Q_WS_MAC
    d->opaque = true;
#else
    d->opaque = false;
#endif
    installEventFilter(this);
    d->topDock = new Q3DockArea(Qt::Horizontal, Q3DockArea::Normal, this, "qt_top_dock");
    d->topDock->installEventFilter(this);
    d->bottomDock = new Q3DockArea(Qt::Horizontal, Q3DockArea::Reverse, this, "qt_bottom_dock");
    d->bottomDock->installEventFilter(this);
    d->leftDock = new Q3DockArea(Qt::Vertical, Q3DockArea::Normal, this, "qt_left_dock");
    d->leftDock->installEventFilter(this);
    d->rightDock = new Q3DockArea(Qt::Vertical, Q3DockArea::Reverse, this, "qt_right_dock");
    d->rightDock->installEventFilter(this);
    d->hideDock = new QHideDock(this);
}


Q3MainWindow::~Q3MainWindow()
{
    delete layout();
}

#ifndef QT_NO_MENUBAR

void Q3MainWindow::setMenuBar(QMenuBar * newMenuBar)
{
    Q_D(Q3MainWindow);
    if (!newMenuBar)
        return;
    if (d->mb)
        delete d->mb;
    d->mb = newMenuBar;
    d->mb->installEventFilter(this);
    triggerLayout();
}


QMenuBar * Q3MainWindow::menuBar() const
{
    Q_D(const Q3MainWindow);
    if (d->mb)
        return d->mb;

    QObjectList l = queryList("QMenuBar", 0, false, false);
    QMenuBar * b;
    if (l.size()) {
        b = static_cast<QMenuBar *>(l.at(0));
    } else {
        b = new QMenuBar((Q3MainWindow *)this);
        b->setObjectName("automatic menu bar");
        b->show();
    }
    d->mb = b;
    d->mb->installEventFilter(const_cast<Q3MainWindow *>(this));
    ((Q3MainWindow *)this)->triggerLayout();
    return b;
}
#endif // QT_NO_MENUBAR

void Q3MainWindow::setStatusBar(QStatusBar * newStatusBar)
{
    Q_D(Q3MainWindow);
    if (!newStatusBar || newStatusBar == d->sb)
        return;
    if (d->sb)
        delete d->sb;
    d->sb = newStatusBar;
#if 0
    // ### this code can cause unnecessary creation of a tool tip group
    connect(toolTipGroup(), SIGNAL(showTip(QString)),
             d->sb, SLOT(showMessage(QString)));
    connect(toolTipGroup(), SIGNAL(removeTip()),
             d->sb, SLOT(clearMessage()));
#endif
    d->sb->installEventFilter(this);
    triggerLayout();
}


QStatusBar * Q3MainWindow::statusBar() const
{
    Q_D(const Q3MainWindow);
    if (d->sb)
        return d->sb;

    QObjectList l = queryList("QStatusBar", 0, false, false);
    QStatusBar * s;
    if (l.size()) {
        s = (QStatusBar *)l.at(0);
    } else {
        s = new QStatusBar((Q3MainWindow *)this, "automatic status bar");
        s->show();
    }
    ((Q3MainWindow *)this)->setStatusBar(s);
    ((Q3MainWindow *)this)->triggerLayout(true);
    return s;
}


#if 0

void Q3MainWindow::setToolTipGroup(QToolTipGroup * newToolTipGroup)
{
    Q_D(Q3MainWindow);
    if (!newToolTipGroup || newToolTipGroup == d->ttg)
        return;
    if (d->ttg)
        delete d->ttg;
    d->ttg = newToolTipGroup;

    connect(toolTipGroup(), SIGNAL(showTip(QString)),
            statusBar(), SLOT(showMessage(QString)));
    connect(toolTipGroup(), SIGNAL(removeTip()),
            statusBar(), SLOT(clearMessage()));
}


QToolTipGroup * Q3MainWindow::toolTipGroup() const
{
    Q_D(const Q3MainWindow);
    if (d->ttg)
        return d->ttg;

    QToolTipGroup * t = new QToolTipGroup((Q3MainWindow*)this,
                                           "automatic tool tip group");
    ((Q3MainWindowPrivate*)d)->ttg = t;
    return t;
}
#endif


void Q3MainWindow::setDockEnabled(Qt::Dock dock, bool enable)
{
    d_func()->docks.insert(dock, enable);
}


bool Q3MainWindow::isDockEnabled(Qt::Dock dock) const
{
    return d_func()->docks[dock];
}

bool Q3MainWindow::isDockEnabled(Q3DockArea *area) const
{
    Q_D(const Q3MainWindow);
    if (area == d->leftDock)
        return d->docks[Qt::DockLeft];
    if (area == d->rightDock)
        return d->docks[Qt::DockRight];
    if (area == d->topDock)
        return d->docks[Qt::DockTop];
    if (area == d->bottomDock)
        return d->docks[Qt::DockBottom];
    return false;
}

void Q3MainWindow::setDockEnabled(Q3DockWindow *dw, Qt::Dock dock, bool enable)
{
    Q_D(Q3MainWindow);
    if (d->dockWindows.contains(dw)) {
        d->dockWindows.append(dw);
        connect(dw, SIGNAL(placeChanged(Q3DockWindow::Place)),
                 this, SLOT(slotPlaceChanged()));
    }
    QString s;
    s.sprintf("%p_%d", (void*)dw, (int)dock);
    if (enable)
        d->disabledDocks.removeAll(s);
    else if (!d->disabledDocks.contains(s))
        d->disabledDocks << s;
    switch (dock) {
        case Qt::DockTop:
            topDock()->setAcceptDockWindow(dw, enable);
            break;
        case Qt::DockLeft:
            leftDock()->setAcceptDockWindow(dw, enable);
            break;
        case Qt::DockRight:
            rightDock()->setAcceptDockWindow(dw, enable);
            break;
        case Qt::DockBottom:
            bottomDock()->setAcceptDockWindow(dw, enable);
            break;
        default:
            break;
    }
}

bool Q3MainWindow::isDockEnabled(Q3DockWindow *dw, Q3DockArea *area) const
{
    Q_D(const Q3MainWindow);
    if (!isDockEnabled(area))
        return false;
    Qt::Dock dock;
    if (area == d->leftDock)
        dock = Qt::DockLeft;
    else if (area == d->rightDock)
        dock = Qt::DockRight;
    else if (area == d->topDock)
        dock = Qt::DockTop;
    else if (area == d->bottomDock)
        dock = Qt::DockBottom;
    else
        return false;
    return isDockEnabled(dw, dock);
}

bool Q3MainWindow::isDockEnabled(Q3DockWindow *tb, Qt::Dock dock) const
{
    if (!isDockEnabled(dock))
        return false;
    QString s;
    s.sprintf("%p_%d", (void*)tb, (int)dock);
    return !d_func()->disabledDocks.contains(s);
}



void Q3MainWindow::addDockWindow(Q3DockWindow *dockWindow,
                              Qt::Dock edge, bool newLine)
{
    Q_D(Q3MainWindow);
#ifdef Q_WS_MAC
    extern WindowPtr qt_mac_window_for(const QWidget*); //qwidget_mac.cpp
    if(isWindow() && edge == Qt::DockTop) {
        d->createWinId();
        ChangeWindowAttributes(qt_mac_window_for(this), kWindowToolbarButtonAttribute, 0);
    }
#endif
    moveDockWindow(dockWindow, edge);
    dockWindow->setNewLine(newLine);
    if (!d->dockWindows.contains(dockWindow)) {
        d->dockWindows.append(dockWindow);
        connect(dockWindow, SIGNAL(placeChanged(Q3DockWindow::Place)),
                 this, SLOT(slotPlaceChanged()));
        dockWindow->installEventFilter(this);
    }
    dockWindow->setOpaqueMoving(d->opaque);
}


void Q3MainWindow::addDockWindow(Q3DockWindow * dockWindow, const QString &label,
                              Qt::Dock edge, bool newLine)
{
    addDockWindow(dockWindow, edge, newLine);
#ifndef QT_NO_TOOLBAR
    Q3ToolBar *tb = qobject_cast<Q3ToolBar*>(dockWindow);
    if (tb)
        tb->setLabel(label);
#endif
}

void Q3MainWindow::moveDockWindow(Q3DockWindow * dockWindow, Qt::Dock edge)
{
    Q_D(Q3MainWindow);
    Qt::Orientation oo = dockWindow->orientation();
    switch (edge) {
    case Qt::DockTop:
        if (dockWindow->area() != d->topDock)
            dockWindow->removeFromDock(false);
        d->topDock->moveDockWindow(dockWindow);
        emit dockWindowPositionChanged(dockWindow);
        break;
    case Qt::DockBottom:
        if (dockWindow->area() != d->bottomDock)
            dockWindow->removeFromDock(false);
        d->bottomDock->moveDockWindow(dockWindow);
        emit dockWindowPositionChanged(dockWindow);
        break;
    case Qt::DockRight:
        if (dockWindow->area() != d->rightDock)
            dockWindow->removeFromDock(false);
        d->rightDock->moveDockWindow(dockWindow);
        emit dockWindowPositionChanged(dockWindow);
        break;
    case Qt::DockLeft:
        if (dockWindow->area() != d->leftDock)
            dockWindow->removeFromDock(false);
        d->leftDock->moveDockWindow(dockWindow);
        emit dockWindowPositionChanged(dockWindow);
        break;
    case Qt::DockTornOff:
        dockWindow->undock();
        break;
    case Qt::DockMinimized:
        dockWindow->undock(d->hideDock);
        break;
    case Qt::DockUnmanaged:
        break;
    }

    if (oo != dockWindow->orientation())
        dockWindow->setOrientation(dockWindow->orientation());
}

void Q3MainWindow::moveDockWindow(Q3DockWindow * dockWindow, Qt::Dock edge, bool nl, int index, int extraOffset)
{
    Q_D(Q3MainWindow);
    Qt::Orientation oo = dockWindow->orientation();

    dockWindow->setNewLine(nl);
    dockWindow->setOffset(extraOffset);
    switch (edge) {
    case Qt::DockTop:
        if (dockWindow->area() != d->topDock)
            dockWindow->removeFromDock(false);
        d->topDock->moveDockWindow(dockWindow, index);
        break;
    case Qt::DockBottom:
        if (dockWindow->area() != d->bottomDock)
            dockWindow->removeFromDock(false);
        d->bottomDock->moveDockWindow(dockWindow, index);
        break;
    case Qt::DockRight:
        if (dockWindow->area() != d->rightDock)
            dockWindow->removeFromDock(false);
        d->rightDock->moveDockWindow(dockWindow, index);
        break;
    case Qt::DockLeft:
        if (dockWindow->area() != d->leftDock)
            dockWindow->removeFromDock(false);
        d->leftDock->moveDockWindow(dockWindow, index);
        break;
    case Qt::DockTornOff:
        dockWindow->undock();
        break;
    case Qt::DockMinimized:
        dockWindow->undock(d->hideDock);
        break;
    case Qt::DockUnmanaged:
        break;
    }

    if (oo != dockWindow->orientation())
        dockWindow->setOrientation(dockWindow->orientation());
}

void Q3MainWindow::removeDockWindow(Q3DockWindow * dockWindow)
{
    Q_D(Q3MainWindow);

#ifdef Q_WS_MAC
    extern WindowPtr qt_mac_window_for(const QWidget*); //qwidget_mac.cpp
    if(isWindow() && dockWindow->area() == topDock() && !dockWindows(Qt::DockTop).count())
        ChangeWindowAttributes(qt_mac_window_for(this), 0, kWindowToolbarButtonAttribute);
#endif

    dockWindow->hide();
    d->dockWindows.removeAll(dockWindow);
    disconnect(dockWindow, SIGNAL(placeChanged(Q3DockWindow::Place)),
                this, SLOT(slotPlaceChanged()));
    dockWindow->removeEventFilter(this);
}

void Q3MainWindow::setUpLayout()
{
    Q_D(Q3MainWindow);
#ifndef QT_NO_MENUBAR
    if (!d->mb) {
        // slightly evil hack here.  reconsider this
        QObjectList l = queryList("QMenuBar", 0, false, false);
        if (l.size())
            d->mb = menuBar();
    }
#endif
    if (!d->sb) {
        // as above.
        QObjectList l = queryList("QStatusBar", 0, false, false);
        if (l.size())
            d->sb = statusBar();
    }

    if (!d->tll) {
        d->tll = new QBoxLayout(this, QBoxLayout::Down);
        d->tll->setResizeMode(minimumSize().isNull() ? QLayout::Minimum : QLayout::FreeResize);
    } else {
        d->tll->setMenuBar(0);
        QLayoutItem *item;
        while ((item = d->tll->takeAt(0)))
            delete item;
    }

#ifndef QT_NO_MENUBAR
    if (d->mb && d->mb->isVisibleTo(this)) {
        d->tll->setMenuBar(d->mb);
        if (style()->styleHint(QStyle::SH_MainWindow_SpaceBelowMenuBar, 0, this))
            d->tll->addSpacing(d->movable ? 1 : 2);
    }
#endif

    d->tll->addWidget(d->hideDock);
    if(d->topDock->parentWidget() == this)
        d->tll->addWidget(d->topDock);

    Q3MainWindowLayout *mwl = new Q3MainWindowLayout(this, d->tll);
    d->tll->setStretchFactor(mwl, 1);

    if(d->leftDock->parentWidget() == this)
        mwl->setLeftDock(d->leftDock);
    if (centralWidget())
        mwl->setCentralWidget(centralWidget());
    if(d->rightDock->parentWidget() == this)
        mwl->setRightDock(d->rightDock);
    d->mwl = mwl;

    if(d->bottomDock->parentWidget() == this)
        d->tll->addWidget(d->bottomDock);

    if (d->sb && d->sb->parentWidget() == this) {
        d->tll->addWidget(d->sb, 0);
        // make the sb stay on top of tool bars if there isn't enough space
        d->sb->raise();
    }
}

void Q3MainWindow::setVisible(bool visible)
{
    Q_D(Q3MainWindow);
    if (visible) {
        if (!d->tll)
            setUpLayout();

        // show all floating dock windows not explicitly hidden
        if (!isVisible()) {
            for (int i = 0; i < d->dockWindows.size(); ++i) {
                Q3DockWindow *dw = d->dockWindows.at(i);
                if (dw->isWindow() && !dw->isVisible() && !dw->testAttribute(Qt::WA_WState_Hidden)) {
                    reinterpret_cast<Q3MainWindow *>(dw)->setAttribute(Qt::WA_WState_Hidden);
                    dw->show();
                }
            }
        }
    } else if (isVisible()) {
        for (int i = 0; i < d->dockWindows.size(); ++i) {
            Q3DockWindow *dw = d->dockWindows.at(i);
            if (dw->isWindow() && dw->isVisible()) {
                dw->hide(); // implicit hide, so clear forcehide
                reinterpret_cast<Q3MainWindow *>(dw)->setAttribute(Qt::WA_WState_Hidden, false);
            }
        }
    }
    QWidget::setVisible(visible);
}


QSize Q3MainWindow::sizeHint() const
{
    Q3MainWindow* that = (Q3MainWindow*) this;
    // Workaround: because d->tll get's deleted in
    // totalSizeHint->polish->sendPostedEvents->childEvent->triggerLayout
    QApplication::sendPostedEvents(that, QEvent::ChildInserted);
    if (!that->d_func()->tll)
        that->setUpLayout();
    return that->d_func()->tll->totalSizeHint();
}

QSize Q3MainWindow::minimumSizeHint() const
{
    Q_D(const Q3MainWindow);
    if (!d->tll) {
        Q3MainWindow* that = (Q3MainWindow*) this;
        that->setUpLayout();
    }
    return d->tll->totalMinimumSize();
}

void Q3MainWindow::setCentralWidget(QWidget * w)
{
    Q_D(Q3MainWindow);
    if (d->mc)
        d->mc->removeEventFilter(this);
    d->mc = w;
    if (d->mc)
        d->mc->installEventFilter(this);
    triggerLayout();
}


QWidget * Q3MainWindow::centralWidget() const
{
    return d_func()->mc;
}


void Q3MainWindow::paintEvent(QPaintEvent *)
{
    Q_D(Q3MainWindow);
    if (d->mb &&
        style()->styleHint(QStyle::SH_MainWindow_SpaceBelowMenuBar, 0, this)) {
        QPainter p(this);
        int y = d->mb->height() + 1;
        QStyleOption opt(0, QStyleOption::SO_Default);
        opt.rect.setRect(0, y, width(), 1);
        opt.palette = palette();
        opt.state = QStyle::State_Sunken;
        style()->drawPrimitive(QStyle::PE_Q3Separator, &opt, &p, this);
    }
}


bool Q3MainWindow::dockMainWindow(QObject *dock) const
{
    while (dock) {
        if (dock->parent() &&
            dock->parent() == const_cast<Q3MainWindow*>(this))
            return true;
        if (qobject_cast<Q3MainWindow*>(dock->parent()))
            return false;
        dock = dock->parent();
    }
    return false;
}

bool Q3MainWindow::eventFilter(QObject* o, QEvent *e)
{
    Q_D(Q3MainWindow);
    if (e->type() == QEvent::Show && o == this) {
        if (!d->tll)
            setUpLayout();
        d->tll->activate();
    } else if (e->type() == QEvent::ContextMenu && d->dockMenu &&
                (qobject_cast<Q3DockArea*>(o) && dockMainWindow(o) || o == d->hideDock || o == d->mb)) {
        if (showDockMenu(((QMouseEvent*)e)->globalPos())) {
            ((QContextMenuEvent*)e)->accept();
            return true;
        }
    }

    return QWidget::eventFilter(o, e);
}


void Q3MainWindow::childEvent(QChildEvent* e)
{
    Q_D(Q3MainWindow);
    if (e->type() == QEvent::ChildRemoved) {
        if (e->child() == 0 ||
             !e->child()->isWidgetType() ||
             ((QWidget*)e->child())->isWindow()) {
            // nothing
        } else if (e->child() == d->sb) {
            d->sb = 0;
            triggerLayout();
        } else if (e->child() == d->mb) {
            d->mb = 0;
            triggerLayout();
        } else if (e->child() == d->mc) {
            d->mc = 0;
            d->mwl->setCentralWidget(0);
            triggerLayout();
        } else if (qobject_cast<Q3DockWindow*>(e->child())) {
            removeDockWindow((Q3DockWindow *)(e->child()));
            d->appropriate.remove((Q3DockWindow*)e->child());
            triggerLayout();
        }
    } else if (e->type() == QEvent::ChildInserted && !d->sb) {
        d->sb = qobject_cast<QStatusBar*>(e->child());
        if (d->sb) {
            if (d->tll) {
                if (!d->tll->findWidget(d->sb))
                    d->tll->addWidget(d->sb);
            } else {
                triggerLayout();
            }
        }
    }
}

bool Q3MainWindow::event(QEvent * e)
{
    Q_D(Q3MainWindow);
#ifndef QT_NO_STATUSTIP
    if (e->type() == QEvent::StatusTip) {
        if (d->sb) {
            d->sb->showMessage(static_cast<QStatusTipEvent*>(e)->tip());
            return true;
        }
    }
#endif
    if (e->type() == QEvent::ToolBarChange) {
        // Keep compatibility with the Qt 3 main window, use the real main window
        // or reimplement if you want proper handling.
        int deltaH = 0;
        Q3DockArea *area = topDock();
        if (area->width() >= area->height()) {
            deltaH = area->sizeHint().height();
            if (!area->isVisible()) {
                area->show();
            } else {
                area->hide();
                deltaH = -deltaH;
            }
        }

        if (deltaH) {
            QApplication::sendPostedEvents(this, QEvent::LayoutRequest);
            resize(width(), height() + deltaH);
        }
        return true;
    }
    if (e->type() == QEvent::ChildRemoved && ((QChildEvent*)e)->child() == d->mc) {
        d->mc->removeEventFilter(this);
        d->mc = 0;
        d->mwl->setCentralWidget(0);
    }

    if (e->type() == QEvent::MenubarUpdated) {
        QMenubarUpdatedEvent * const event = static_cast<QMenubarUpdatedEvent *>(e);
        if (event->menuBar() && event->menuBar()->parent() == this) {
            triggerLayout();
            update();
        }
    }
    return QWidget::event(e);
}


bool Q3MainWindow::usesBigPixmaps() const
{
    return d_func()->ubp;
}

void Q3MainWindow::setUsesBigPixmaps(bool enable)
{
    Q_D(Q3MainWindow);
    if (enable == (bool)d->ubp)
        return;

    d->ubp = enable;
    emit pixmapSizeChanged(enable);

    QObjectList l = queryList("QLayout");
    for (int i = 0; i < l.size(); ++i)
            static_cast<QLayout *>(l.at(i))->activate();
}

bool Q3MainWindow::usesTextLabel() const
{
    return d_func()->utl;
}


void Q3MainWindow::setUsesTextLabel(bool enable)
{
    Q_D(Q3MainWindow);
    if (enable == (bool)d->utl)
        return;

    d->utl = enable;
    emit usesTextLabelChanged(enable);

    QObjectList l = queryList("QLayout");
    for (int i = 0; i < l.size(); ++i)
            static_cast<QLayout *>(l.at(i))->activate();
    triggerLayout(false);
}


void Q3MainWindow::setRightJustification(bool enable)
{
    Q_D(Q3MainWindow);
    if (enable == (bool)d->justify)
        return;
    d->justify = enable;
    triggerLayout(true);
}


bool Q3MainWindow::rightJustification() const
{
    return d_func()->justify;
}

void Q3MainWindow::triggerLayout(bool deleteLayout)
{
    Q_D(Q3MainWindow);
    if (deleteLayout || !d->tll)
        setUpLayout();
    QApplication::postEvent(this, new QEvent(QEvent::LayoutHint));
}

void Q3MainWindow::whatsThis()
{
#ifndef QT_NO_WHATSTHIS
    QWhatsThis::enterWhatsThisMode();
#endif
}

bool Q3MainWindow::getLocation(Q3DockWindow *dw, Qt::Dock &dock, int &index, bool &nl, int &extraOffset) const
{
    Q_D(const Q3MainWindow);
    dock = Qt::DockTornOff;
    if (d->topDock->hasDockWindow(dw, &index))
        dock = Qt::DockTop;
    else if (d->bottomDock->hasDockWindow(dw, &index))
        dock = Qt::DockBottom;
    else if (d->leftDock->hasDockWindow(dw, &index))
        dock = Qt::DockLeft;
    else if (d->rightDock->hasDockWindow(dw, &index))
        dock = Qt::DockRight;
    else if (dw->parentWidget() == d->hideDock) {
        index = 0;
        dock = Qt::DockMinimized;
    } else {
        index = 0;
    }
    nl = dw->newLine();
    extraOffset = dw->offset();
    return true;
}

#ifndef QT_NO_TOOLBAR

QList<Q3ToolBar *> Q3MainWindow::toolBars(Qt::Dock dock) const
{
    QList<Q3DockWindow *> lst = dockWindows(dock);
    QList<Q3ToolBar *> tbl;
    for (int i = 0; i < lst.size(); ++i) {
        Q3ToolBar *tb = qobject_cast<Q3ToolBar *>(lst.at(i));
        if (tb)
            tbl.append(tb);
    }
    return tbl;
}
#endif

QList<Q3DockWindow *> Q3MainWindow::dockWindows(Qt::Dock dock) const
{
    Q_D(const Q3MainWindow);
    QList<Q3DockWindow *> lst;
    switch (dock) {
    case Qt::DockTop:
        return d->topDock->dockWindowList();
    case Qt::DockBottom:
        return d->bottomDock->dockWindowList();
    case Qt::DockLeft:
        return d->leftDock->dockWindowList();
    case Qt::DockRight:
        return d->rightDock->dockWindowList();
    case Qt::DockTornOff: {
        for (int i = 0; i < d->dockWindows.size(); ++i) {
            Q3DockWindow *w = d->dockWindows.at(i);
            if (!w->area() && w->place() == Q3DockWindow::OutsideDock)
                lst.append(w);
        }
    }
    return lst;
    case Qt::DockMinimized: {
        QObjectList childList = d->hideDock->children();
        for (int i = 0; i < childList.size(); ++i) {
            Q3DockWindow *dw = qobject_cast<Q3DockWindow*>(childList.at(i));
            if (dw)
                lst.append(dw);
        }
    }
    return lst;
    default:
        break;
    }
    return lst;
}

QList<Q3DockWindow *> Q3MainWindow::dockWindows() const
{
    return d_func()->dockWindows;
}

void Q3MainWindow::setDockWindowsMovable(bool enable)
{
    Q_D(Q3MainWindow);
    d->movable = enable;
    QObjectList l = queryList("Q3DockWindow");
    for (int i = 0; i < l.size(); ++i)
        static_cast<Q3DockWindow*>(l.at(i))->setMovingEnabled(enable);
}

bool Q3MainWindow::dockWindowsMovable() const
{
    return d_func()->movable;
}

void Q3MainWindow::setOpaqueMoving(bool b)
{
    Q_D(Q3MainWindow);
    d->opaque = b;
    QObjectList l = queryList("Q3DockWindow");
    for (int i = 0; i < l.size(); ++i)
        static_cast<Q3DockWindow*>(l.at(i))->setOpaqueMoving(b);
}

bool Q3MainWindow::opaqueMoving() const
{
    return d_func()->opaque;
}

void Q3MainWindow::lineUpDockWindows(bool keepNewLines)
{
    Q_D(const Q3MainWindow);
    if (!dockWindowsMovable())
        return;
    d->topDock->lineUp(keepNewLines);
    d->leftDock->lineUp(keepNewLines);
    d->rightDock->lineUp(keepNewLines);
    d->bottomDock->lineUp(keepNewLines);
}

bool Q3MainWindow::isDockMenuEnabled() const
{
    return d_func()->dockMenu;
}

void Q3MainWindow::setDockMenuEnabled(bool b)
{
    d_func()->dockMenu = b;
}

Q3PopupMenu *Q3MainWindow::createDockWindowMenu(DockWindows dockWindows) const
{
    Q_D(const Q3MainWindow);
    QObjectList l = queryList("Q3DockWindow");
    if (l.isEmpty())
        return 0;

    Q3PopupMenu *menu = new Q3PopupMenu((Q3MainWindow*)this);
    menu->setObjectName("qt_customize_menu");
    d->dockWindowModes.replace( menu, dockWindows );
    menu->setCheckable(true);
    connect( menu, SIGNAL(aboutToShow()), this, SLOT(menuAboutToShow()) );
    return menu;
}

void Q3MainWindow::menuAboutToShow()
{
    Q_D(Q3MainWindow);
    Q3PopupMenu *menu = (Q3PopupMenu*)sender();
    menu->clear();

    DockWindows dockWindows;
    {
        QMap<Q3PopupMenu*, DockWindows>::Iterator it = d->dockWindowModes.find( menu );
        if ( it == d->dockWindowModes.end() )
            return;
        dockWindows = (*it);
    }

    QObjectList l = queryList("Q3DockWindow");
    bool empty = true;
    if (!l.isEmpty()) {
        if (dockWindows == AllDockWindows || dockWindows == NoToolBars) {
            for (int i = 0; i < l.size(); ++i) {
                Q3DockWindow *dw = (Q3DockWindow*)l.at(i);
                if (!appropriate(dw) || qobject_cast<Q3ToolBar*>(dw) || !dockMainWindow(dw))
                    continue;
                QString label = dw->windowTitle();
                if (!label.isEmpty()) {
                    QAction *act = menu->addAction(label);
                    act->setChecked(dw->isVisible());
                    QObject::connect(act, SIGNAL(triggered()), dw, SLOT(toggleVisible()));
                    empty = false;
                }
            }
        }
        if (!empty) {
            menu->addSeparator();
            empty = true;
        }
#ifndef QT_NO_TOOLBAR
        if (dockWindows == AllDockWindows || dockWindows == OnlyToolBars) {
            for (int i = 0; i < l.size(); ++i) {
                Q3ToolBar *tb = qobject_cast<Q3ToolBar*>(l.at(i));
                if (!tb || !appropriate(tb) || !dockMainWindow(tb))
                    continue;
                QString label = tb->label();
                if (!label.isEmpty()) {
                    QAction *act = menu->addAction(label);
                    act->setCheckable(true);
                    act->setChecked(tb->isVisible());
                    QObject::connect(act, SIGNAL(triggered()), tb, SLOT(toggleVisible()));
                    empty = false;
                }
            }
        }
#endif
    }
    if (!empty) {
        menu->addSeparator();
        empty = true;
    }

    if (dockWindowsMovable())
        menu->addAction(tr("Line up"), this, SLOT(doLineUp()));
    if (isCustomizable())
        menu->addAction(tr("Customize..."), this, SLOT(customize()));
}


bool Q3MainWindow::showDockMenu(const QPoint &globalPos)
{
    Q_D(Q3MainWindow);
    if (!d->dockMenu)
        return false;

    if(Q3PopupMenu *ret = createDockWindowMenu()) {
        ret->exec(globalPos);
        delete ret;
        return true;
    }
    return false;
}

void Q3MainWindow::slotPlaceChanged()
{
    QObject* obj = (QObject*)sender();
    Q3DockWindow *dw = qobject_cast<Q3DockWindow*>(obj);
    if (dw)
        emit dockWindowPositionChanged(dw);
#ifndef QT_NO_TOOLBAR
    Q3ToolBar *tb = qobject_cast<Q3ToolBar*>(obj);
    if (tb)
        emit toolBarPositionChanged(tb);
#endif
}

Q3DockArea *Q3MainWindow::dockingArea(const QPoint &p)
{
    Q_D(Q3MainWindow);
    int mh = d->mb ? d->mb->height() : 0;
    int sh = d->sb ? d->sb->height() : 0;
    if (p.x() >= -5 && p.x() <= 100 && p.y() > mh && p.y() - height() - sh)
        return d->leftDock;
    if (p.x() >= width() - 100 && p.x() <= width() + 5 && p.y() > mh && p.y() - height() - sh)
        return d->rightDock;
    if (p.y() >= -5 && p.y() < mh + 100 && p.x() >= 0 && p.x() <= width())
        return d->topDock;
    if (p.y() >= height() - sh - 100 && p.y() <= height() + 5 && p.x() >= 0 && p.x() <= width())
        return d->bottomDock;
    return 0;
}

bool Q3MainWindow::hasDockWindow(Q3DockWindow *dw)
{
    return d_func()->dockWindows.contains(dw);
}

Q3DockArea *Q3MainWindow::leftDock() const
{
    return d_func()->leftDock;
}

Q3DockArea *Q3MainWindow::rightDock() const
{
    return d_func()->rightDock;
}

Q3DockArea *Q3MainWindow::topDock() const
{
    return d_func()->topDock;
}

Q3DockArea *Q3MainWindow::bottomDock() const
{
    return d_func()->bottomDock;
}

void Q3MainWindow::customize()
{
}

bool Q3MainWindow::isCustomizable() const
{
    return false;
}

bool Q3MainWindow::appropriate(Q3DockWindow *dw) const
{
    Q_D(const Q3MainWindow);
    QMap<Q3DockWindow*, bool>::ConstIterator it = d->appropriate.find(dw);
    if (it == d->appropriate.end())
        return true;
    return *it;
}

void Q3MainWindow::setAppropriate(Q3DockWindow *dw, bool a)
{
    d_func()->appropriate.insert(dw, a);
}

#ifndef QT_NO_TEXTSTREAM
static void saveDockArea(QTextStream &ts, Q3DockArea *a)
{
    QList<Q3DockWindow *> l = a->dockWindowList();
    for (int i = 0; i < l.size(); ++i) {
        Q3DockWindow *dw = l.at(i);
        ts << QString(dw->windowTitle());
        ts << ",";
    }
    ts << endl;
    ts << *a;
}

QTextStream &operator<<(QTextStream &ts, const Q3MainWindow &mainWindow)
{
    QList<Q3DockWindow *> l = mainWindow.dockWindows(Qt::DockMinimized);
    for (int i = 0; i < l.size(); ++i) {
        Q3DockWindow *dw = l.at(i);
        ts << dw->windowTitle();
        ts << ",";
    }
    ts << endl;

    l = mainWindow.dockWindows(Qt::DockTornOff);
    for (int i = 0; i < l.size(); ++i) {
        Q3DockWindow *dw = l.at(i);
        ts << dw->windowTitle();
        ts << ",";
    }
    ts << endl;
    for (int i = 0; i < l.size(); ++i) {
        Q3DockWindow *dw = l.at(i);
        ts << "[" << dw->windowTitle() << ","
           << (int)dw->geometry().x() << ","
           << (int)dw->geometry().y() << ","
           << (int)dw->geometry().width() << ","
           << (int)dw->geometry().height() << ","
           << (int)dw->isVisible() << "]";
    }
    ts << endl;

    saveDockArea(ts, mainWindow.topDock());
    saveDockArea(ts, mainWindow.bottomDock());
    saveDockArea(ts, mainWindow.rightDock());
    saveDockArea(ts, mainWindow.leftDock());
    return ts;
}

static void loadDockArea(const QStringList &names, Q3DockArea *a, Qt::Dock dl, QList<Q3DockWindow *> &l, Q3MainWindow *mw, QTextStream &ts)
{
    for (QStringList::ConstIterator it = names.begin(); it != names.end(); ++it) {
        for (int i = 0; i < l.size(); ++i) {
            Q3DockWindow *dw = l.at(i);
            if (dw->windowTitle() == *it) {
                mw->addDockWindow(dw, dl);
                break;
            }
        }
    }
    if (a) {
        ts >> *a;
    } else if (dl == Qt::DockTornOff) {
        QString s = ts.readLine();
        enum State { Pre, Name, X, Y, Width, Height, Visible, Post };
        int state = Pre;
        QString name, x, y, w, h, visible;
        QChar c;
        for (int i = 0; i < (int)s.length(); ++i) {
            c = s[i];
            if (state == Pre && c == '[') {
                state++;
                continue;
            }
            if (c == ',' &&
                 (state == Name || state == X || state == Y || state == Width || state == Height)) {
                state++;
                continue;
            }
            if (state == Visible && c == ']') {
                for (int i = 0; i < l.size(); ++i) {
                    Q3DockWindow *dw = l.at(i);
                    if (QString(dw->windowTitle()) == name) {
                        if (!qobject_cast<Q3ToolBar*>(dw))
                            dw->setGeometry(x.toInt(), y.toInt(), w.toInt(), h.toInt());
                        else
                            dw->setGeometry(x.toInt(), y.toInt(), dw->width(), dw->height());
                        if (!(bool)visible.toInt())
                            dw->hide();
                        else
                            dw->show();
                        break;
                    }
                }

                name = x = y = w = h = visible = "";

                state = Pre;
                continue;
            }
            if (state == Name)
                name += c;
            else if (state == X)
                x += c;
            else if (state == Y)
                y += c;
            else if (state == Width)
                w += c;
            else if (state == Height)
                h += c;
            else if (state == Visible)
                visible += c;
        }
    }
}

QTextStream &operator>>(QTextStream &ts, Q3MainWindow &mainWindow)
{
    QList<Q3DockWindow *> l = mainWindow.dockWindows();

    QString s = ts.readLine();
    QStringList names = s.split(',');
    loadDockArea(names, 0, Qt::DockMinimized, l, &mainWindow, ts);

    s = ts.readLine();
    names = s.split(',');
    loadDockArea(names, 0, Qt::DockTornOff, l, &mainWindow, ts);

    int i = 0;
    Q3DockArea *areas[] = { mainWindow.topDock(), mainWindow.bottomDock(), mainWindow.rightDock(), mainWindow.leftDock() };
    for (int dl = (int)Qt::DockTop; dl != (int)Qt::DockMinimized; ++dl, ++i) {
        s = ts.readLine();
        names = s.split(',');
        loadDockArea(names, areas[i], (Qt::Dock)dl, l, &mainWindow, ts);
    }
    return ts;
}
#endif

#include "q3mainwindow.moc"

#endif

---