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qmainwindow.cpp

/****************************************************************************
**
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**
** This file is part of the QtGui module of the Qt Toolkit.
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** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
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#include "qmainwindow.h"
#include "qmainwindowlayout_p.h"

#ifndef QT_NO_MAINWINDOW

#include "qdockwidget.h"
#include "qtoolbar.h"

#include <qapplication.h>
#include <qmenubar.h>
#include <qstatusbar.h>
#include <qevent.h>
#include <qstyle.h>
#include <qdebug.h>
#include <qpainter.h>

#include <private/qwidget_p.h>
#include "qtoolbar_p.h"
#include "qwidgetanimator_p.h"
#ifdef Q_WS_MAC
#include <private/qt_mac_p.h>
extern WindowRef qt_mac_window_for(const QWidget *); // qwidget_mac.cpp
#endif

class QMainWindowPrivate : public QWidgetPrivate
{
    Q_DECLARE_PUBLIC(QMainWindow)
public:
    inline QMainWindowPrivate()
        : layout(0), toolButtonStyle(Qt::ToolButtonIconOnly)
#ifdef Q_WS_MAC
            , useHIToolBar(false)
#endif
    { }
    QMainWindowLayout *layout;
    QSize iconSize;
    bool explicitIconSize;
    Qt::ToolButtonStyle toolButtonStyle;
#ifdef Q_WS_MAC
    bool useHIToolBar;
#endif
    void init();
    QList<int> hoverSeparator;
    QPoint hoverPos;

#if !defined(QT_NO_DOCKWIDGET) && !defined(QT_NO_CURSOR)
    QCursor separatorCursor(const QList<int> &path) const;
    void adjustCursor(const QPoint &pos);
#endif
};

void QMainWindowPrivate::init()
{
    Q_Q(QMainWindow);
    layout = new QMainWindowLayout(q);
    const int metric = q->style()->pixelMetric(QStyle::PM_ToolBarIconSize);
    iconSize = QSize(metric, metric);
    explicitIconSize = false;

    q->setAttribute(Qt::WA_Hover);
}

/*
    The Main Window:

    +----------------------------------------------------------+
    | Menu Bar                                                 |
    +----------------------------------------------------------+
    | Tool Bar Area                                            |
    |   +--------------------------------------------------+   |
    |   | Dock Window Area                                 |   |
    |   |   +------------------------------------------+   |   |
    |   |   |                                          |   |   |
    |   |   | Central Widget                           |   |   |
    |   |   |                                          |   |   |
    |   |   |                                          |   |   |
    |   |   |                                          |   |   |
    |   |   |                                          |   |   |
    |   |   |                                          |   |   |
    |   |   |                                          |   |   |
    |   |   |                                          |   |   |
    |   |   |                                          |   |   |
    |   |   |                                          |   |   |
    |   |   |                                          |   |   |
    |   |   +------------------------------------------+   |   |
    |   |                                                  |   |
    |   +--------------------------------------------------+   |
    |                                                          |
    +----------------------------------------------------------+
    | Status Bar                                               |
    +----------------------------------------------------------+

*/

/*!
    \class QMainWindow
    \brief The QMainWindow class provides a main application
         window.
    \ingroup application
    \mainclass

    \tableofcontents

    \section1 Qt Main Window Framework

    A main window provides a framework for building an
    application's user interface. Qt has QMainWindow and its \l{Main
    Window and Related Classes}{related classes} for main window
    management. QMainWindow has its own layout to which you can add
    \l{QToolBar}s, \l{QDockWidget}s, a
    QMenuBar, and a QStatusBar. The layout has a center area that can
    be occupied by any kind of widget. You can see an image of the
    layout below.

    \image mainwindowlayout.png

    \section1 Creating Main Window Components

    A central widget will typically be a standard Qt widget such
    as a QTextEdit or a QGraphicsView. Custom widgets can also be
    used for advanced applications. You set the central widget with \c
    setCentralWidget().

    Main windows have either a single (SDI) or multiple (MDI)
    document interface. You create MDI applications in Qt by using a
    QMdiArea as the central widget.

    We will now examine each of the other widgets that can be
    added to a main window. We give examples on how to create and add
    them.

    \section2 Creating Menus

    Qt implements menus in QMenu and QMainWindow keeps them in a
    QMenuBar. \l{QAction}{QAction}s are added to the menus, which
    display them as menu items.

    You can add new menus to the main window's menu bar by calling
    \c menuBar(), which returns the QMenuBar for the window, and then
    add a menu with QMenuBar::addMenu().

    QMainWindow comes with a default menu bar, but you can also
    set one yourself with \c setMenuBar(). If you wish to implement a
    custom menu bar (i.e., not use the QMenuBar widget), you can set it
    with \c setMenuWidget().

    An example of how to create menus follows:

    \quotefromfile mainwindows/application/mainwindow.cpp
    \skipto /::createMenus/
    \printuntil /saveAct/

    The \c createPopupMenu() function creates popup menus when the
    main window receives context menu events.  The default
    implementation generates a menu with the checkable actions from
    the dock widgets and toolbars. You can reimplement \c
    createPopupMenu() for a custom menu.

    \section2 Creating Toolbars

    Toolbars are implemented in the QToolBar class.  You add a
    toolbar to a main window with \c addToolBar().

    You control the initial position of toolbars by assigning them
    to a specific Qt::ToolBarArea. You can split an area by inserting
    a toolbar break - think of this as a line break in text editing -
    with \c addToolBarBreak() or \c insertToolBarBreak(). You can also
    restrict placement by the user with QToolBar::setAllowedAreas()
    and QToolBar::setMovable().

    The size of toolbar icons can be retrieved with \c iconSize().
    The sizes are platform dependent; you can set a fixed size with \c
    setIconSize(). You can alter the appearance of all tool buttons in
    the toolbars with \c setToolButtonStyle().

    An example of toolbar creation follows:

    \quotefromfile mainwindows/application/mainwindow.cpp
    \skipto /::createToolBars/
    \printuntil /fileToolBar->addAction/

    \section2 Creating Dock Widgets

    Dock widgets are implemented in the QDockWidget class. A dock
    widget is a window that can be docked into the main window.  You
    add dock widgets to a main window with \c addDockWidget().

    There are four dock widget areas as given by the
    Qt::DockWidgetArea enum: left, right, top, and bottom. You can
    specify which dock widget area that should occupy the corners
    where the areas overlap with \c setDockWidgetCorner(). By default
    each area can only contain one row (vertical or horizontal) of
    dock widgets, but if you enable nesting with \c
    setDockNestingEnabled(), dock widgets can be added in either
    direction.

    Two dock widgets may also be stacked on top of each other. A
    QTabBar is then used to select which of the widgets that should be
    displayed.

    We give an example of how to create and add dock widgets to a
    main window:

    \quotefromfile snippets/mainwindowsnippet.cpp
    \skipto /QDockWidget \*dockWidget/
    \printuntil /addDockWidget/

    \section2 The Status Bar

    You can set a status bar with \c setStatusBar(), but one is
    created the first time \c statusBar() (which returns the main
    window's status bar) is called. See QStatusBar for information on
    how to use it.

    \section1 Storing State

    QMainWindow can store the state of its layout with \c
    saveState(); it can later be retrieved with \c restoreState(). It
    is the position and size (relative to the size of the main window)
    of the toolbars and dock widgets that are stored.

    \sa QMenuBar, QToolBar, QStatusBar, QDockWidget, {Application
    Example}, {Dock Widgets Example}, {MDI Example}, {SDI Example},
    {Menus Example}
*/

/*!
    \fn void QMainWindow::iconSizeChanged(const QSize &iconSize)

    This signal is emitted when the size of the icons used in the
    window is changed. The new icon size is passed in \a iconSize.

    You can connect this signal to other components to help maintain
    a consistent appearance for your application.

    \sa setIconSize()
*/

/*!
    \fn void QMainWindow::toolButtonStyleChanged(Qt::ToolButtonStyle toolButtonStyle)

    This signal is emitted when the style used for tool buttons in the
    window is changed. The new style is passed in \a toolButtonStyle.

    You can connect this signal to other components to help maintain
    a consistent appearance for your application.

    \sa setToolButtonStyle()
*/

/*!
    Constructs a QMainWindow with the given \a parent and the specified
    widget \a flags.
 */
00298 QMainWindow::QMainWindow(QWidget *parent, Qt::WindowFlags flags)
    : QWidget(*(new QMainWindowPrivate()), parent, flags | Qt::Window)
{
    d_func()->init();
}

#ifdef QT3_SUPPORT
/*!
    \obsolete
    Constructs a QMainWindow with the given \a parent, \a name, and
    with the specified widget \a flags.
 */
QMainWindow::QMainWindow(QWidget *parent, const char *name, Qt::WindowFlags flags)
    : QWidget(*(new QMainWindowPrivate()), parent, flags | Qt::WType_TopLevel)
{
    setObjectName(QString::fromAscii(name));
    d_func()->init();
}
#endif

/*!
    Destroys the main window.
 */
00321 QMainWindow::~QMainWindow()
{ }

/*! \property QMainWindow::iconSize
    \brief size of toolbar icons in this mainwindow.

    The default is the default tool bar icon size of the GUI style.
    Note that the icons used must be at least of this size as the
    icons are only scaled down.
*/

/*!
    \property QMainWindow::dockOptions
    \brief the docking behavior of QMainWindow
    \since 4.3

    The default value is AnimatedDocks | AllowTabbedDocks.
*/

/*!
    \enum QMainWindow::DockOption
    \since 4.3

    This enum contains flags that specify the docking behavior of QMainWindow.

    \value AnimatedDocks    Identical to the \l animated property.

    \value AllowNestedDocks Identical to the \l dockNestingEnabled property.

    \value AllowTabbedDocks The user can drop one dock widget "on top" of
                            another. The two widgets are stacked and a tab
                            bar appears for selecting which one is visible.

    \value ForceTabbedDocks Each dock area contains a single stack of tabbed
                            dock widgets. In other words, dock widgets cannot
                            be placed next to each other in a dock area. If
                            this option is set, AllowNestedDocks has no effect.

    \value VerticalTabs     The two vertical dock areas on the sides of the
                            main window show their tabs vertically. If this
                            option is not set, all dock areas show their tabs
                            at the bottom. Implies AllowTabbedDocks.

    These options only control how dock widgets may be dropped in a QMainWindow.
    They do not re-arrange the dock widgets to conform with the specified
    options. For this reason they should be set before any dock widgets
    are added to the main window. Exceptions to this are the AnimatedDocks and
    VerticalTabs options, which may be set at any time.
*/

void QMainWindow::setDockOptions(DockOptions opt)
{
    Q_D(QMainWindow);
    d->layout->setDockOptions(opt);
}

QMainWindow::DockOptions QMainWindow::dockOptions() const
{
    Q_D(const QMainWindow);
    return d->layout->dockOptions;
}

QSize QMainWindow::iconSize() const
{ return d_func()->iconSize; }

void QMainWindow::setIconSize(const QSize &iconSize)
{
    Q_D(QMainWindow);
    QSize sz = iconSize;
    if (!sz.isValid()) {
        const int metric = style()->pixelMetric(QStyle::PM_ToolBarIconSize);
        sz = QSize(metric, metric);
    }
    if (d->iconSize != sz) {
        d->iconSize = sz;
        emit iconSizeChanged(d->iconSize);
    }
    d->explicitIconSize = iconSize.isValid();
}

/*! \property QMainWindow::toolButtonStyle
    \brief style of toolbar buttons in this mainwindow.

    The default is Qt::ToolButtonIconOnly.
*/

Qt::ToolButtonStyle QMainWindow::toolButtonStyle() const
{ return d_func()->toolButtonStyle; }

void QMainWindow::setToolButtonStyle(Qt::ToolButtonStyle toolButtonStyle)
{
    Q_D(QMainWindow);
    if (d->toolButtonStyle == toolButtonStyle)
        return;
    d->toolButtonStyle = toolButtonStyle;
    emit toolButtonStyleChanged(d->toolButtonStyle);
}

#ifndef QT_NO_MENUBAR
/*!
    Returns the menu bar for the main window. This function creates
    and returns an empty menu bar if the menu bar does not exist.

    \sa setMenuBar()
*/
00426 QMenuBar *QMainWindow::menuBar() const
{
    QMenuBar *menuBar = qobject_cast<QMenuBar *>(d_func()->layout->menuBar());
    if (!menuBar) {
      QMainWindow *self = const_cast<QMainWindow *>(this);
      menuBar = new QMenuBar(self);
      self->setMenuBar(menuBar);
    }
    return menuBar;
}

/*!
    Sets the menu bar for the main window to \a menuBar.

    Note: QMainWindow takes ownership of the \a menuBar pointer and
    deletes it at the appropriate time.

    \sa menuBar()
*/
00445 void QMainWindow::setMenuBar(QMenuBar *menuBar)
{
    Q_D(QMainWindow);
    if (d->layout->menuBar() && d->layout->menuBar() != menuBar) {
        // Reparent corner widgets before we delete the old menu bar.
        QMenuBar *oldMenuBar = qobject_cast<QMenuBar *>(d->layout->menuBar());
        if (menuBar) {
            // TopLeftCorner widget.
            QWidget *cornerWidget = oldMenuBar->cornerWidget(Qt::TopLeftCorner);
            if (cornerWidget)
                menuBar->setCornerWidget(cornerWidget, Qt::TopLeftCorner);
            // TopRightCorner widget.
            cornerWidget = oldMenuBar->cornerWidget(Qt::TopRightCorner);
            if (cornerWidget)
                menuBar->setCornerWidget(cornerWidget, Qt::TopRightCorner);
        }
        delete oldMenuBar;
    }
    d->layout->setMenuBar(menuBar);
}

/*!
    \since 4.2

    Returns the menu bar for the main window. This function returns
    null if a menu bar hasn't been constructed yet.
*/
00472 QWidget *QMainWindow::menuWidget() const
{
    QWidget *menuBar = d_func()->layout->menuBar();
    return menuBar;
}

/*!
    \since 4.2

    Sets the menu bar for the main window to \a menuBar.

    QMainWindow takes ownership of the \a menuBar pointer and
    deletes it at the appropriate time.
*/
00486 void QMainWindow::setMenuWidget(QWidget *menuBar)
{
    Q_D(QMainWindow);
    if (d->layout->menuBar() && d->layout->menuBar() != menuBar)
        delete d->layout->menuBar();
    d->layout->setMenuBar(menuBar);
}
#endif // QT_NO_MENUBAR

#ifndef QT_NO_STATUSBAR
/*!
    Returns the status bar for the main window. This function creates
    and returns an empty status bar if the status bar does not exist.

    \sa setStatusBar()
*/
00502 QStatusBar *QMainWindow::statusBar() const
{
    QStatusBar *statusbar = d_func()->layout->statusBar();
    if (!statusbar) {
      QMainWindow *self = const_cast<QMainWindow *>(this);
      statusbar = new QStatusBar(self);
        statusbar->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Fixed);
      self->setStatusBar(statusbar);
    }
    return statusbar;
}

/*!
    Sets the status bar for the main window to \a statusbar.

    Setting the status bar to 0 will remove it from the main window.
    Note that QMainWindow takes ownership of the \a statusbar pointer
    and deletes it at the appropriate time.

    \sa statusBar()
*/
00523 void QMainWindow::setStatusBar(QStatusBar *statusbar)
{
    Q_D(QMainWindow);
    if (d->layout->statusBar() && d->layout->statusBar() != statusbar)
        delete d->layout->statusBar();
    d->layout->setStatusBar(statusbar);
}
#endif // QT_NO_STATUSBAR

/*!
    Returns the central widget for the main window. This function
    returns zero if the central widget has not been set.

    \sa setCentralWidget()
*/
00538 QWidget *QMainWindow::centralWidget() const
{ return d_func()->layout->centralWidget(); }

/*!
    Sets the given \a widget to be the main window's central widget.

    Note: QMainWindow takes ownership of the \a widget pointer and
    deletes it at the appropriate time.

    \sa centralWidget()
*/
00549 void QMainWindow::setCentralWidget(QWidget *widget)
{
    Q_D(QMainWindow);
    if (d->layout->centralWidget() && d->layout->centralWidget() != widget)
        delete d->layout->centralWidget();
    d->layout->setCentralWidget(widget);
}

#ifndef QT_NO_DOCKWIDGET
/*!
    Sets the given dock widget \a area to occupy the specified \a
    corner.

    \sa corner()
*/
00564 void QMainWindow::setCorner(Qt::Corner corner, Qt::DockWidgetArea area)
{
    bool valid = false;
    switch (corner) {
    case Qt::TopLeftCorner:
        valid = (area == Qt::TopDockWidgetArea || area == Qt::LeftDockWidgetArea);
        break;
    case Qt::TopRightCorner:
        valid = (area == Qt::TopDockWidgetArea || area == Qt::RightDockWidgetArea);
        break;
    case Qt::BottomLeftCorner:
        valid = (area == Qt::BottomDockWidgetArea || area == Qt::LeftDockWidgetArea);
        break;
    case Qt::BottomRightCorner:
        valid = (area == Qt::BottomDockWidgetArea || area == Qt::RightDockWidgetArea);
        break;
    }
    if (!valid)
        qWarning("QMainWindow::setCorner(): 'area' is not valid for 'corner'");
    else
        d_func()->layout->setCorner(corner, area);
}

/*!
    Returns the dock widget area that occupies the specified \a
    corner.

    \sa setCorner()
*/
00593 Qt::DockWidgetArea QMainWindow::corner(Qt::Corner corner) const
{ return d_func()->layout->corner(corner); }
#endif

#ifndef QT_NO_TOOLBAR

static bool checkToolBarArea(Qt::ToolBarArea area, const char *where)
{
    switch (area) {
    case Qt::LeftToolBarArea:
    case Qt::RightToolBarArea:
    case Qt::TopToolBarArea:
    case Qt::BottomToolBarArea:
        return true;
    default:
        break;
    }
    qWarning("%s: invalid 'area' argument", where);
    return false;
}

/*!
    Adds a toolbar break to the given \a area after all the other
    objects that are present.
*/
00618 void QMainWindow::addToolBarBreak(Qt::ToolBarArea area)
{
    if (!checkToolBarArea(area, "QMainWindow::addToolBarBreak"))
        return;
    d_func()->layout->addToolBarBreak(area);
}

/*!
    Inserts a toolbar break before the toolbar specified by \a before.
*/
00628 void QMainWindow::insertToolBarBreak(QToolBar *before)
{ d_func()->layout->insertToolBarBreak(before); }

/*!
    Removes a toolbar break previously inserted before the toolbar specified by \a before.
*/

00635 void QMainWindow::removeToolBarBreak(QToolBar *before)
{
    Q_D(QMainWindow);
    d->layout->removeToolBarBreak(before);
}

/*!
    Adds the \a toolbar into the specified \a area in this main
    window. The \a toolbar is placed at the end of the current tool
    bar block (i.e. line). If the main window already manages \a toolbar
    then it will only move the toolbar to \a area.

    \sa insertToolBar() addToolBarBreak() insertToolBarBreak()
*/
00649 void QMainWindow::addToolBar(Qt::ToolBarArea area, QToolBar *toolbar)
{
    if (!checkToolBarArea(area, "QMainWindow::addToolBar"))
        return;

    Q_D(QMainWindow);

    disconnect(this, SIGNAL(iconSizeChanged(QSize)),
               toolbar, SLOT(_q_updateIconSize(QSize)));
    disconnect(this, SIGNAL(toolButtonStyleChanged(Qt::ToolButtonStyle)),
               toolbar, SLOT(_q_updateToolButtonStyle(Qt::ToolButtonStyle)));

    if (!d->layout->usesHIToolBar(toolbar)) {
        d->layout->removeWidget(toolbar);
    } else {
        d->layout->removeToolBar(toolbar);
    }

    toolbar->d_func()->_q_updateIconSize(d->iconSize);
    toolbar->d_func()->_q_updateToolButtonStyle(d->toolButtonStyle);
    connect(this, SIGNAL(iconSizeChanged(QSize)),
            toolbar, SLOT(_q_updateIconSize(QSize)));
    connect(this, SIGNAL(toolButtonStyleChanged(Qt::ToolButtonStyle)),
            toolbar, SLOT(_q_updateToolButtonStyle(Qt::ToolButtonStyle)));

    d->layout->addToolBar(area, toolbar);
}

/*! \overload
    Equivalent of calling addToolBar(Qt::TopToolBarArea, \a toolbar)
*/
00680 void QMainWindow::addToolBar(QToolBar *toolbar)
{ addToolBar(Qt::TopToolBarArea, toolbar); }

/*!
    \overload

    Creates a QToolBar object, setting its window title to \a title,
    and inserts it into the top toolbar area.

    \sa setWindowTitle()
*/
00691 QToolBar *QMainWindow::addToolBar(const QString &title)
{
    QToolBar *toolBar = new QToolBar(this);
    toolBar->setWindowTitle(title);
    addToolBar(toolBar);
    return toolBar;
}

/*!
    Inserts the \a toolbar into the area occupied by the \a before toolbar
    so that it appears before it. For example, in normal left-to-right
    layout operation, this means that \a toolbar will appear to the left
    of the toolbar specified by \a before in a horizontal toolbar area.

    \sa insertToolBarBreak() addToolBar() addToolBarBreak()
*/
00707 void QMainWindow::insertToolBar(QToolBar *before, QToolBar *toolbar)
{
    Q_D(QMainWindow);

    d->layout->removeToolBar(toolbar);

    toolbar->d_func()->_q_updateIconSize(d->iconSize);
    toolbar->d_func()->_q_updateToolButtonStyle(d->toolButtonStyle);
    connect(this, SIGNAL(iconSizeChanged(QSize)),
            toolbar, SLOT(_q_updateIconSize(QSize)));
    connect(this, SIGNAL(toolButtonStyleChanged(Qt::ToolButtonStyle)),
            toolbar, SLOT(_q_updateToolButtonStyle(Qt::ToolButtonStyle)));

    d->layout->insertToolBar(before, toolbar);
}

/*!
    Removes the \a toolbar from the main window layout and hides
    it. Note that the \a toolbar is \e not deleted.
*/
00727 void QMainWindow::removeToolBar(QToolBar *toolbar)
{
    if (toolbar) {
        d_func()->layout->removeToolBar(toolbar);
        toolbar->hide();
    }
}

/*!
    Returns the Qt::ToolBarArea for \a toolbar. If \a toolbar has not
    been added to the main window, this function returns \c
    Qt::NoToolBarArea.

    \sa addToolBar() addToolBarBreak() Qt::ToolBarArea
*/
00742 Qt::ToolBarArea QMainWindow::toolBarArea(QToolBar *toolbar) const
{ return d_func()->layout->toolBarArea(toolbar); }

/*!

    Returns whether there is a toolbar
    break before the \a toolbar.

    \sa  addToolBarBreak(), insertToolBarBreak()
*/
00752 bool QMainWindow::toolBarBreak(QToolBar *toolbar) const
{
    return d_func()->layout->toolBarBreak(toolbar);
}

#endif // QT_NO_TOOLBAR

#ifndef QT_NO_DOCKWIDGET

/*! \property QMainWindow::animated
    \brief whether manipulating dock widgets and tool bars is animated
    \since 4.2

    When a dock widget or tool bar is dragged over the
    main window, the main window adjusts its contents
    to indicate where the dock widget or tool bar will
    be docked if it is dropped. Setting this property
    causes QMainWindow to move its contents in a smooth
    animation. Clearing this property causes the contents
    to snap into their new positions.

    By default, this property is set. It may be cleared if
    the main window contains widgets which are slow at resizing
    or repainting themselves.

    Setting this property is identical to setting the AnimatedDocks
    option using setDockOptions().
*/

bool QMainWindow::isAnimated() const
{
    Q_D(const QMainWindow);
    return d->layout->dockOptions & AnimatedDocks;
}

void QMainWindow::setAnimated(bool enabled)
{
    Q_D(QMainWindow);

    DockOptions opts = d->layout->dockOptions;
    if (enabled)
        opts |= AnimatedDocks;
    else
        opts &= ~AnimatedDocks;

    d->layout->setDockOptions(opts);
}

/*! \property QMainWindow::dockNestingEnabled
    \brief whether docks can be nested
    \since 4.2

    If this property is false, dock areas can only contain a single row
    (horizontal or vertical) of dock widgets. If this property is true,
    the area occupied by a dock widget can be split in either direction to contain
    more dock widgets.

    Dock nesting is only necessary in applications that contain a lot of
    dock widgets. It gives the user greater freedom in organizing their
    main window. However, dock nesting leads to more complex
    (and less intuitive) behavior when a dock widget is dragged over the
    main window, since there are more ways in which a dropped dock widget
    may be placed in the dock area.

    Setting this property is identical to setting the AllowNestedDocks option
    using setDockOptions().
*/

bool QMainWindow::isDockNestingEnabled() const
{
    Q_D(const QMainWindow);
    return d->layout->dockOptions & AllowNestedDocks;
}

void QMainWindow::setDockNestingEnabled(bool enabled)
{
    Q_D(QMainWindow);

    DockOptions opts = d->layout->dockOptions;
    if (enabled)
        opts |= AllowNestedDocks;
    else
        opts &= ~AllowNestedDocks;

    d->layout->setDockOptions(opts);
}

#if 0
/*! \property QMainWindow::verticalTabsEnabled
    \brief whether left and right dock areas use vertical tabs
    \since 4.2

    If this property is set to false, dock areas containing tabbed dock widgets
    display horizontal tabs, simmilar to Visual Studio.

    If this property is set to true, then the right and left dock areas display vertical
    tabs, simmilar to KDevelop.

    This property should be set before any dock widgets are added to the main window.
*/

bool QMainWindow::verticalTabsEnabled() const
{
    return d_func()->layout->verticalTabsEnabled();
}

void QMainWindow::setVerticalTabsEnabled(bool enabled)
{
    d_func()->layout->setVerticalTabsEnabled(enabled);
}
#endif

static bool checkDockWidgetArea(Qt::DockWidgetArea area, const char *where)
{
    switch (area) {
    case Qt::LeftDockWidgetArea:
    case Qt::RightDockWidgetArea:
    case Qt::TopDockWidgetArea:
    case Qt::BottomDockWidgetArea:
        return true;
    default:
        break;
    }
    qWarning("%s: invalid 'area' argument", where);
    return false;
}

/*!
    Adds the given \a dockwidget to the specified \a area.
*/
00882 void QMainWindow::addDockWidget(Qt::DockWidgetArea area, QDockWidget *dockwidget)
{
    if (!checkDockWidgetArea(area, "QMainWindow::addDockWidget"))
        return;

    Qt::Orientation orientation = Qt::Vertical;
    switch (area) {
    case Qt::TopDockWidgetArea:
    case Qt::BottomDockWidgetArea:
        orientation = Qt::Horizontal;
        break;
    default:
        break;
    }
    d_func()->layout->removeWidget(dockwidget); // in case it was already in here
    addDockWidget(area, dockwidget, orientation);

#ifdef Q_WS_MAC     //drawer support
    extern bool qt_mac_is_macdrawer(const QWidget *); //qwidget_mac.cpp
    if (qt_mac_is_macdrawer(dockwidget)) {
        extern bool qt_mac_set_drawer_preferred_edge(QWidget *, Qt::DockWidgetArea); //qwidget_mac.cpp
        window()->createWinId();
        dockwidget->window()->createWinId();
        qt_mac_set_drawer_preferred_edge(dockwidget, area);
        if (dockwidget->isVisible()) {
            dockwidget->hide();
            dockwidget->show();
        }
    }
#endif
}

/*!
    Adds \a dockwidget into the given \a area in the direction
    specified by the \a orientation.
*/
00918 void QMainWindow::addDockWidget(Qt::DockWidgetArea area, QDockWidget *dockwidget,
                                Qt::Orientation orientation)
{
    if (!checkDockWidgetArea(area, "QMainWindow::addDockWidget"))
        return;

    // add a window to an area, placing done relative to the previous
    d_func()->layout->addDockWidget(area, dockwidget, orientation);
}

/*!
    \fn void QMainWindow::splitDockWidget(QDockWidget *first, QDockWidget *second, Qt::Orientation orientation)

    Splits the space covered by the \a first dock widget into two parts,
    moves the \a first dock widget into the first part, and moves the
    \a second dock widget into the second part.

    The \a orientation specifies how the space is divided: A Qt::Horizontal
    split places the second dock widget to the right of the first; a
    Qt::Vertical split places the second dock widget below the first.

    \e Note: if \a first is currently in a tabbed docked area, \a second will
    be added as a new tab, not as a neighbor of \a first. This is because a
    single tab can contain only one dock widget.

    \e Note: The Qt::LayoutDirection influences the order of the dock widgets
    in the two parts of the divided area. When right-to-left layout direction
    is enabled, the placing of the dock widgets will be reversed.

    \sa tabifyDockWidget(), addDockWidget(), removeDockWidget()
*/
00949 void QMainWindow::splitDockWidget(QDockWidget *after, QDockWidget *dockwidget,
                                  Qt::Orientation orientation)
{
    d_func()->layout->splitDockWidget(after, dockwidget, orientation);
}

/*!
    \fn void QMainWindow::tabifyDockWidget(QDockWidget *first, QDockWidget *second)

    Moves \a second dock widget on top of \a first dock widget, creating a tabbed
    docked area in the main window.
*/
00961 void QMainWindow::tabifyDockWidget(QDockWidget *first, QDockWidget *second)
{
    d_func()->layout->tabifyDockWidget(first, second);
}

/*!
    Removes the \a dockwidget from the main window layout and hides
    it. Note that the \a dockwidget is \e not deleted.
*/
00970 void QMainWindow::removeDockWidget(QDockWidget *dockwidget)
{
    if (dockwidget) {
        d_func()->layout->removeWidget(dockwidget);
        dockwidget->hide();
    }
}

/*!
    Returns the Qt::DockWidgetArea for \a dockwidget. If \a dockwidget
    has not been added to the main window, this function returns \c
    Qt::NoDockWidgetArea.

    \sa addDockWidget() splitDockWidget() Qt::DockWidgetArea
*/
00985 Qt::DockWidgetArea QMainWindow::dockWidgetArea(QDockWidget *dockwidget) const
{ return d_func()->layout->dockWidgetArea(dockwidget); }

#endif // QT_NO_DOCKWIDGET

/*!
    Saves the current state of this mainwindow's toolbars and
    dockwidgets. The \a version number is stored as part of the data.

    The \link QObject::objectName objectName\endlink property is used
    to identify each QToolBar and QDockWidget.  You should make sure
    that this property is unique for each QToolBar and QDockWidget you
    add to the QMainWindow

    To restore the saved state, pass the return value and \a version
    number to restoreState().

    \sa restoreState()
*/
01004 QByteArray QMainWindow::saveState(int version) const
{
    QByteArray data;
    QDataStream stream(&data, QIODevice::WriteOnly);
    stream << QMainWindowLayout::VersionMarker;
    stream << version;
    d_func()->layout->saveState(stream);
    return data;
}

/*!
    Restores the \a state of this mainwindow's toolbars and
    dockwidgets. The \a version number is compared with that stored
    in \a state. If they do not match, the mainwindow's state is left
    unchanged, and this function returns \c false; otherwise, the state
    is restored, and this function returns \c true.

    \sa saveState()
*/
01023 bool QMainWindow::restoreState(const QByteArray &state, int version)
{
    if (state.isEmpty())
        return false;
    QByteArray sd = state;
    QDataStream stream(&sd, QIODevice::ReadOnly);
    int marker, v;
    stream >> marker;
    stream >> v;
    if (stream.status() != QDataStream::Ok || marker != QMainWindowLayout::VersionMarker || v != version)
        return false;
    bool restored = d_func()->layout->restoreState(stream);
    return restored;
}

#if !defined(QT_NO_DOCKWIDGET) && !defined(QT_NO_CURSOR)
QCursor QMainWindowPrivate::separatorCursor(const QList<int> &path) const
{
    QDockAreaLayoutInfo *info = layout->layoutState.dockAreaLayout.info(path);
    Q_ASSERT(info != 0);
    if (path.size() == 1) { // is this the "top-level" separator which separates a dock area
                            // from the central widget?
        switch (path.first()) {
            case QInternal::LeftDock:
            case QInternal::RightDock:
                return Qt::SplitHCursor;
            case QInternal::TopDock:
            case QInternal::BottomDock:
                return Qt::SplitVCursor;
            default:
                break;
        }
    }

    // no, it's a splitter inside a dock area, separating two dock widgets

    return info->o == Qt::Horizontal
            ? Qt::SplitHCursor : Qt::SplitVCursor;
}

void QMainWindowPrivate::adjustCursor(const QPoint &pos)
{
    Q_Q(QMainWindow);

    hoverPos = pos;

    if (pos == QPoint(0, 0)) {
        if (!hoverSeparator.isEmpty())
            q->update(layout->layoutState.dockAreaLayout.separatorRect(hoverSeparator));
        hoverSeparator.clear();
        q->unsetCursor();
    } else {
        QList<int> pathToSeparator
            = layout->layoutState.dockAreaLayout.findSeparator(pos);

        if (pathToSeparator != hoverSeparator) {
            if (!hoverSeparator.isEmpty())
                q->update(layout->layoutState.dockAreaLayout.separatorRect(hoverSeparator));

            hoverSeparator = pathToSeparator;

            if (hoverSeparator.isEmpty()) {
                q->unsetCursor();
            } else {
                q->update(layout->layoutState.dockAreaLayout.separatorRect(hoverSeparator));
                QCursor cursor = separatorCursor(hoverSeparator);
                q->setCursor(cursor);
            }
        }
    }
}
#endif

/*! \reimp */
01097 bool QMainWindow::event(QEvent *event)
{
    Q_D(QMainWindow);
    switch (event->type()) {

#ifndef QT_NO_DOCKWIDGET
        case QEvent::Paint: {
            QPainter p(this);
            QRegion r = static_cast<QPaintEvent*>(event)->region();
            d->layout->layoutState.dockAreaLayout.paintSeparators(&p, this, r, d->hoverPos);
            break;
        }

#ifndef QT_NO_CURSOR
        case QEvent::HoverMove:  {
            d->adjustCursor(static_cast<QHoverEvent*>(event)->pos());
            break;
        }

        // We don't want QWidget to call update() on the entire QMainWindow
        // on HoverEnter and HoverLeave, hence accept the event (return true).
        case QEvent::HoverEnter:
            return true;
        case QEvent::HoverLeave:
            d->adjustCursor(QPoint(0, 0));
            return true;
        case QEvent::ShortcutOverride: // when a menu pops up
            d->adjustCursor(QPoint(0, 0));
            break;
#endif // QT_NO_CURSOR

        case QEvent::MouseButtonPress: {
            QMouseEvent *e = static_cast<QMouseEvent*>(event);
            if (e->button() == Qt::LeftButton && d->layout->startSeparatorMove(e->pos())) {
                // The click was on a separator, eat this event
                e->accept();
                return true;
            }
            break;
        }

        case QEvent::MouseMove: {
            QMouseEvent *e = static_cast<QMouseEvent*>(event);

#ifndef QT_NO_CURSOR
            d->adjustCursor(e->pos());
#endif
            if (e->buttons() & Qt::LeftButton) {
                if (d->layout->separatorMove(e->pos())) {
                    // We're moving a separator, eat this event
                    e->accept();
                    return true;
                }
            }

            break;
        }

        case QEvent::MouseButtonRelease: {
            QMouseEvent *e = static_cast<QMouseEvent*>(event);
            if (d->layout->endSeparatorMove(e->pos())) {
                // We've released a separator, eat this event
                e->accept();
                return true;
            }
            break;
        }

#endif

#ifndef QT_NO_TOOLBAR
        case QEvent::ToolBarChange: {
            d->layout->toggleToolBarsVisible();
            return true;
        }
#endif

#ifndef QT_NO_STATUSTIP
        case QEvent::StatusTip:
#ifndef QT_NO_STATUSBAR
            if (QStatusBar *sb = d->layout->statusBar())
                sb->showMessage(static_cast<QStatusTipEvent*>(event)->tip());
            else
#endif
                static_cast<QStatusTipEvent*>(event)->ignore();
            return true;
#endif // QT_NO_STATUSTIP

        case QEvent::StyleChange:
            if (!d->explicitIconSize)
                setIconSize(QSize());
            break;
#ifdef Q_WS_MAC
        case QEvent::Show: {
            if (unifiedTitleAndToolBarOnMac())
                ShowHideWindowToolbar(qt_mac_window_for(this), true, false);
            break;
       }
#endif

        default:
            break;
    }

    return QWidget::event(event);
}

#ifndef QT_NO_TOOLBAR

/*!
    \property QMainWindow::unifiedTitleAndToolBarOnMac
    \brief whether the window uses the unified title and toolbar look on Mac OS X
    \since 4.3

    This property is false by default and only has any effect on Mac OS X 10.4 or higher.

    If set to true, then the top toolbar area is replaced with a Carbon
    HIToolbar and all toolbars in the top toolbar area are moved to that. Any
    toolbars added afterwards will also be added to the Carbon HIToolbar. This
    means a couple of things.

    \list
    \i QToolBars in this toolbar area are not movable and you cannot drag other toolbars to it
    \i Toolbar breaks are not respected or preserved
    \i Any custom widgets in the toolbar will not be shown if the toolbar becomes too small
      (only actions will be shown)
    \i If you call showFullScreen() on the main window, the QToolbar will
       disappear since it is considered to be part of the title bar. You can work
       around this by doing the following by turning off the unified toolbar
       before you call showFullScrenn() and restore the value after you call
       showNormal().
    \endlist

    Setting this back to false will remove these restrictions.

    The Qt::WA_MacBrushedMetal attribute takes precedence over this property.
*/
void QMainWindow::setUnifiedTitleAndToolBarOnMac(bool set)
{
#ifdef Q_WS_MAC
    Q_D(QMainWindow);
    if (!isWindow() || d->useHIToolBar == set || QSysInfo::MacintoshVersion < QSysInfo::MV_10_3)
        return;

    d->useHIToolBar = set;
    createWinId(); // We need the hiview for down below.

    d->layout->updateHIToolBarStatus();
#else
    Q_UNUSED(set)
#endif
}

bool QMainWindow::unifiedTitleAndToolBarOnMac() const
{
#ifdef Q_WS_MAC
    return d_func()->useHIToolBar && !testAttribute(Qt::WA_MacBrushedMetal);
#endif
    return false;
}

#endif // QT_NO_TOOLBAR

/*!
    \internal
*/
01263 bool QMainWindow::isSeparator(const QPoint &pos) const
{
#ifndef QT_NO_DOCKWIDGET
    Q_D(const QMainWindow);
    return !d->layout->layoutState.dockAreaLayout.findSeparator(pos).isEmpty();
#else
    Q_UNUSED(pos);
    return false;
#endif
}

/*!
    \reimp
*/
01277 void QMainWindow::contextMenuEvent(QContextMenuEvent *event)
{
    // only show the context menu for direct QDockWidget and QToolBar
    // children and for the menu bar as well
    QWidget *child = childAt(event->pos());
    while (child && child != this) {
#ifndef QT_NO_MENUBAR
        if (QMenuBar *mb = qobject_cast<QMenuBar *>(child)) {
            if (mb->parentWidget() != this)
                return;
            break;
        }
#endif
#ifndef QT_NO_DOCKWIDGET
        if (QDockWidget *dw = qobject_cast<QDockWidget *>(child)) {
            if (dw->parentWidget() != this)
                return;
            if (dw->widget()
                && dw->widget()->geometry().contains(child->mapFrom(this, event->pos()))) {
                // ignore the event if the mouse is over the QDockWidget contents
                return;
            }
            break;
        }
#endif // QT_NO_DOCKWIDGET
#ifndef QT_NO_TOOLBAR
        if (QToolBar *tb = qobject_cast<QToolBar *>(child)) {
            if (tb->parentWidget() != this)
                return;
            break;
        }
#endif
        child = child->parentWidget();
    }
    if (child == this)
        return;

#ifndef QT_NO_MENU
    QMenu *popup = createPopupMenu();
    if (!popup)
      return;
    popup->exec(event->globalPos());
    delete popup;
    event->accept();
#endif
}

#ifndef QT_NO_MENU
/*!
    Returns a popup menu containing checkable entries for the toolbars and
    dock widgets present in the main window. If  there are no toolbars and
    dock widgets present, this function returns a null pointer.

    By default, this function is called by the main window when the user
    activates a context menu, typically by right-clicking on a toolbar or a dock
    widget.

    If you want to create a custom popup menu, reimplement this function and
    return a newly-created popup menu. Ownership of the popup menu is transferred
    to the caller.

    \sa addDockWidget(), addToolBar(), menuBar()
*/
01340 QMenu *QMainWindow::createPopupMenu()
{
    Q_D(QMainWindow);
    QMenu *menu = 0;
#ifndef QT_NO_DOCKWIDGET
    QList<QDockWidget *> dockwidgets = qFindChildren<QDockWidget *>(this);
    if (dockwidgets.size()) {
        menu = new QMenu(this);
        for (int i = 0; i < dockwidgets.size(); ++i) {
            QDockWidget *dockWidget = dockwidgets.at(i);
            if (dockWidget->parentWidget() == this
                && !d->layout->layoutState.dockAreaLayout.indexOf(dockWidget).isEmpty()) {
                menu->addAction(dockwidgets.at(i)->toggleViewAction());
            }
        }
        menu->addSeparator();
    }
#endif // QT_NO_DOCKWIDGET
#ifndef QT_NO_TOOLBAR
    QList<QToolBar *> toolbars = qFindChildren<QToolBar *>(this);
    if (toolbars.size()) {
        if (!menu)
            menu = new QMenu(this);
        for (int i = 0; i < toolbars.size(); ++i) {
            QToolBar *toolBar = toolbars.at(i);
            if (toolBar->parentWidget() == this
                && !d->layout->layoutState.toolBarAreaLayout.indexOf(toolBar).isEmpty()) {
                menu->addAction(toolbars.at(i)->toggleViewAction());
            }
        }
    }
#endif
    Q_UNUSED(d);
    return menu;
}
#endif // QT_NO_MENU

#endif // QT_NO_MAINWINDOW

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