qmenubar.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include <qmenubar.h>
 
#include <qstyle.h>
#include <qlayout.h>
#include <qapplication.h>
#if QT_CONFIG(accessibility)
# include <qaccessible.h>
#endif
#include <qpainter.h>
#include <qstylepainter.h>
#include <qevent.h>
#if QT_CONFIG(mainwindow)
#include <qmainwindow.h>
#endif
#if QT_CONFIG(toolbar)
#include <qtoolbar.h>
#endif
#if QT_CONFIG(toolbutton)
#include <qtoolbutton.h>
#endif
#if QT_CONFIG(whatsthis)
#include <qwhatsthis.h>
#endif
#include <qpa/qplatformtheme.h>
#include "private/qguiapplication_p.h"
#include "qpa/qplatformintegration.h"
 
#include "qmenu_p.h"
#include "qmenubar_p.h"
#include <private/qscreen_p.h>
#include "qdebug.h"
 
QT_BEGIN_NAMESPACE
 
using namespace Qt::StringLiterals;
 
class QMenuBarExtension : public QToolButton
{
public:
    explicit QMenuBarExtension(QWidget *parent);
 
    QSize sizeHint() const override;
    void paintEvent(QPaintEvent *) override;
};
 
QMenuBarExtension::QMenuBarExtension(QWidget *parent)
    : QToolButton(parent)
{
    setObjectName("qt_menubar_ext_button"_L1);
    setAutoRaise(true);
#if QT_CONFIG(menu)
    setPopupMode(QToolButton::InstantPopup);
#endif
    setIcon(style()->standardIcon(QStyle::SP_ToolBarHorizontalExtensionButton, nullptr, parentWidget()));
}
 
void QMenuBarExtension::paintEvent(QPaintEvent *)
{
    QStylePainter p(this);
    QStyleOptionToolButton opt;
    initStyleOption(&opt);
    // We do not need to draw both extension arrows
    opt.features &= ~QStyleOptionToolButton::HasMenu;
    p.drawComplexControl(QStyle::CC_ToolButton, opt);
}
 
 
QSize QMenuBarExtension::sizeHint() const
{
    int ext = style()->pixelMetric(QStyle::PM_ToolBarExtensionExtent, nullptr, parentWidget());
    return QSize(ext, ext);
}
 
 
QAction *QMenuBarPrivate::actionAt(QPoint p) const
{
    for(int i = 0; i < actions.size(); ++i) {
        if (actionRect(actions.at(i)).contains(p))
            return actions.at(i);
    }
    return nullptr;
}
 
QRect QMenuBarPrivate::menuRect(bool extVisible) const
{
    Q_Q(const QMenuBar);
 
    int hmargin = q->style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, nullptr, q);
    QRect result = q->rect();
    result.adjust(hmargin, 0, -hmargin, 0);
 
    if (extVisible) {
        if (q->isRightToLeft())
            result.setLeft(result.left() + extension->sizeHint().width());
        else
            result.setWidth(result.width() - extension->sizeHint().width());
    }
 
    if (leftWidget && leftWidget->isVisible()) {
        QSize sz = leftWidget->sizeHint();
        if (q->isRightToLeft())
            result.setRight(result.right() - sz.width());
        else
            result.setLeft(result.left() + sz.width());
    }
 
    if (rightWidget && rightWidget->isVisible()) {
        QSize sz = rightWidget->sizeHint();
        if (q->isRightToLeft())
            result.setLeft(result.left() + sz.width());
        else
            result.setRight(result.right() - sz.width());
    }
 
    return result;
}
 
bool QMenuBarPrivate::isVisible(QAction *action)
{
    return !hiddenActions.contains(action);
}
 
void QMenuBarPrivate::updateGeometries()
{
    Q_Q(QMenuBar);
    if (!itemsDirty)
        return;
    int q_width = q->width()-(q->style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, nullptr, q)*2);
    int q_start = -1;
    if (leftWidget || rightWidget) {
        int vmargin = q->style()->pixelMetric(QStyle::PM_MenuBarVMargin, nullptr, q)
                      + q->style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, nullptr, q);
        int hmargin = q->style()->pixelMetric(QStyle::PM_MenuBarHMargin, nullptr, q)
                      + q->style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, nullptr, q);
        if (leftWidget && leftWidget->isVisible()) {
            QSize sz = leftWidget->sizeHint();
            q_width -= sz.width();
            q_start = sz.width();
            QPoint pos(hmargin, (q->height() - leftWidget->height()) / 2);
            QRect vRect = QStyle::visualRect(q->layoutDirection(), q->rect(), QRect(pos, sz));
            leftWidget->setGeometry(vRect);
        }
        if (rightWidget && rightWidget->isVisible()) {
            QSize sz = rightWidget->sizeHint();
            q_width -= sz.width();
            QPoint pos(q->width() - sz.width() - hmargin, vmargin);
            QRect vRect = QStyle::visualRect(q->layoutDirection(), q->rect(), QRect(pos, sz));
            rightWidget->setGeometry(vRect);
        }
    }
 
#ifdef Q_OS_MAC
    if (q->isNativeMenuBar()) {//nothing to see here folks, move along..
        itemsDirty = false;
        return;
    }
#endif
    calcActionRects(q_width, q_start);
    currentAction = nullptr;
#ifndef QT_NO_SHORTCUT
    if (itemsDirty) {
        for(int j = 0; j < shortcutIndexMap.size(); ++j)
            q->releaseShortcut(shortcutIndexMap.value(j));
        shortcutIndexMap.clear();
        const int actionsCount = actions.size();
        shortcutIndexMap.reserve(actionsCount);
        for (int i = 0; i < actionsCount; i++)
            shortcutIndexMap.append(q->grabShortcut(QKeySequence::mnemonic(actions.at(i)->text())));
    }
#endif
    itemsDirty = false;
 
    hiddenActions.clear();
    //this is the menu rectangle without any extension
    QRect menuRect = this->menuRect(false);
 
    //we try to see if the actions will fit there
    bool hasHiddenActions = false;
    for (int i = 0; i < actions.size(); ++i) {
        const QRect &rect = actionRects.at(i);
        if (rect.isValid() && !menuRect.contains(rect)) {
            hasHiddenActions = true;
            break;
        }
    }
 
    //...and if not, determine the ones that fit on the menu with the extension visible
    if (hasHiddenActions) {
        menuRect = this->menuRect(true);
        for (int i = 0; i < actions.size(); ++i) {
            const QRect &rect = actionRects.at(i);
            if (rect.isValid() && !menuRect.contains(rect)) {
                hiddenActions.append(actions.at(i));
            }
        }
    }
 
    if (hiddenActions.size() > 0) {
        QMenu *pop = extension->menu();
        if (!pop) {
            pop = new QMenu(q);
            extension->setMenu(pop);
        }
        pop->clear();
        pop->addActions(hiddenActions);
 
        int vmargin = q->style()->pixelMetric(QStyle::PM_MenuBarVMargin, nullptr, q);
        int x = q->isRightToLeft()
                ? menuRect.left() - extension->sizeHint().width() + 1
                : menuRect.right();
        extension->setGeometry(x, vmargin, extension->sizeHint().width(), menuRect.height() - vmargin*2);
        extension->show();
    } else {
        extension->hide();
    }
    q->updateGeometry();
}
 
QRect QMenuBarPrivate::actionRect(QAction *act) const
{
    const int index = actions.indexOf(act);
 
    //makes sure the geometries are up-to-date
    const_cast<QMenuBarPrivate*>(this)->updateGeometries();
 
    if (index < 0 || index >= actionRects.size())
        return QRect(); // that can happen in case of native menubar
 
    return actionRects.at(index);
}
 
void QMenuBarPrivate::focusFirstAction()
{
    if (!currentAction) {
        updateGeometries();
        int index = 0;
        while (index < actions.size() && actionRects.at(index).isNull()) ++index;
        if (index < actions.size())
            setCurrentAction(actions.at(index));
    }
}
 
void QMenuBarPrivate::setKeyboardMode(bool b)
{
    Q_Q(QMenuBar);
    if (b && !q->style()->styleHint(QStyle::SH_MenuBar_AltKeyNavigation, nullptr, q)) {
        setCurrentAction(nullptr);
        return;
    }
    keyboardState = b;
    if (b) {
        QWidget *fw = QApplication::focusWidget();
        if (fw && fw != q && fw->window() != QApplication::activePopupWidget())
            keyboardFocusWidget = fw;
        focusFirstAction();
        q->setFocus(Qt::MenuBarFocusReason);
    } else {
        if (!popupState)
            setCurrentAction(nullptr);
        if (keyboardFocusWidget) {
            if (QApplication::focusWidget() == q)
                keyboardFocusWidget->setFocus(Qt::MenuBarFocusReason);
            keyboardFocusWidget = nullptr;
        }
    }
    q->update();
}
 
void QMenuBarPrivate::popupAction(QAction *action, bool activateFirst)
{
    Q_Q(QMenuBar);
    if (!action || !action->menu() || closePopupMode)
        return;
    popupState = true;
    if (action->isEnabled() && action->menu()->isEnabled()) {
        closePopupMode = 0;
        activeMenu = action->menu();
        auto *activeMenuPriv = activeMenu->d_func();
        activeMenuPriv->causedPopup.widget = q;
        activeMenuPriv->causedPopup.action = action;
 
        QRect adjustedActionRect = actionRect(action);
        QPoint popupPos = adjustedActionRect.bottomLeft() + QPoint(0, 1);
 
        //we put the popup menu on the screen containing the bottom-center of the action rect
        QScreen *menubarScreen = q->window()->windowHandle()->screen();
        QPoint screenTestPos = q->mapToGlobal(popupPos + QPoint(adjustedActionRect.width() / 2, 0));
        QPointer<QScreen> popupScreen = menubarScreen->virtualSiblingAt(screenTestPos);
        if (!popupScreen)
            popupScreen = menubarScreen;
        std::swap(popupScreen, activeMenuPriv->popupScreen);
        const QSize popup_size = activeMenu->sizeHint();
        std::swap(popupScreen, activeMenuPriv->popupScreen);
 
        // Use screenTestPos.y() for the popup y position. This is the correct global y
        // consistent with the selected screen in cases where the action rect spans
        // multiple screens with different scale factors.
        QPoint pos(q->mapToGlobal(popupPos).x(), screenTestPos.y());
 
        QRect screenRect = popupScreen->geometry();
        pos = QPoint(qMax(pos.x(), screenRect.x()), qMax(pos.y(), screenRect.y()));
        const bool fitUp = (pos.y() - popup_size.height() >= screenRect.top());
        const bool fitDown = (pos.y() + popup_size.height() <= screenRect.bottom());
        const bool rtl = q->isRightToLeft();
        const int actionWidth = adjustedActionRect.width();
 
        if (!fitUp && !fitDown) { //we should shift the menu
            bool shouldShiftToRight = !rtl;
            if (rtl && popup_size.width() > pos.x())
                shouldShiftToRight = true;
            else if (actionWidth + popup_size.width() + pos.x() > screenRect.right())
                shouldShiftToRight = false;
 
            if (shouldShiftToRight) {
                pos.rx() += actionWidth + (rtl ? popup_size.width() : 0);
            } else {
                //shift to left
                if (!rtl)
                    pos.rx() -= popup_size.width();
            }
        } else if (rtl) {
            pos.rx() += actionWidth;
        }
 
        if (!defaultPopDown || (fitUp && !fitDown))
            pos.setY(qMax(screenRect.y(), q->mapToGlobal(QPoint(0, adjustedActionRect.top()-popup_size.height())).y()));
        QMenuPrivate::get(activeMenu)->topData()->initialScreen = popupScreen;
        activeMenu->popup(pos);
        if (activateFirst)
            activeMenu->d_func()->setFirstActionActive();
    }
    q->update(actionRect(action));
}
 
void QMenuBarPrivate::setCurrentAction(QAction *action, bool popup, bool activateFirst)
{
    if (currentAction == action && popup == popupState)
        return;
 
    autoReleaseTimer.stop();
 
    doChildEffects = (popup && !activeMenu);
    Q_Q(QMenuBar);
    QWidget *fw = nullptr;
    if (QMenu *menu = activeMenu) {
        activeMenu = nullptr;
        if (popup) {
            fw = q->window()->focusWidget();
            q->setFocus(Qt::NoFocusReason);
        }
        menu->hide();
    }
 
    if (currentAction)
        q->update(actionRect(currentAction));
 
    popupState = popup;
#if QT_CONFIG(statustip)
    QAction *previousAction = currentAction;
#endif
    currentAction = action;
    if (action && action->isEnabled()) {
        activateAction(action, QAction::Hover);
        if (popup)
            popupAction(action, activateFirst);
        q->update(actionRect(action));
#if QT_CONFIG(statustip)
    }  else if (previousAction) {
        QString empty;
        QStatusTipEvent tip(empty);
        QCoreApplication::sendEvent(q, &tip);
#endif
    }
    if (fw)
        fw->setFocus(Qt::NoFocusReason);
}
 
void QMenuBarPrivate::calcActionRects(int max_width, int start) const
{
    Q_Q(const QMenuBar);
 
    if (!itemsDirty)
        return;
 
    //let's reinitialize the buffer
    actionRects.resize(actions.size());
    actionRects.fill(QRect());
 
    const QStyle *style = q->style();
 
    const int itemSpacing = style->pixelMetric(QStyle::PM_MenuBarItemSpacing, nullptr, q);
    int max_item_height = 0, separator = -1, separator_start = 0, separator_len = 0;
 
    //calculate size
    const QFontMetrics fm = q->fontMetrics();
    const int hmargin = style->pixelMetric(QStyle::PM_MenuBarHMargin, nullptr, q),
              vmargin = style->pixelMetric(QStyle::PM_MenuBarVMargin, nullptr, q),
                icone = style->pixelMetric(QStyle::PM_SmallIconSize, nullptr, q);
    for(int i = 0; i < actions.size(); i++) {
        QAction *action = actions.at(i);
        if (!action->isVisible())
            continue;
 
        QSize sz;
 
        //calc what I think the size is..
        if (action->isSeparator()) {
            if (style->styleHint(QStyle::SH_DrawMenuBarSeparator, nullptr, q))
                separator = i;
            continue; //we don't really position these!
        } else {
            const QString s = action->text();
            QIcon is = action->icon();
            // If an icon is set, only the icon is visible
            if (!is.isNull())
                sz = sz.expandedTo(QSize(icone, icone));
            else if (!s.isEmpty())
                sz = fm.size(Qt::TextShowMnemonic, s);
        }
 
        //let the style modify the above size..
        QStyleOptionMenuItem opt;
        q->initStyleOption(&opt, action);
        sz = q->style()->sizeFromContents(QStyle::CT_MenuBarItem, &opt, sz, q);
 
        if (!sz.isEmpty()) {
            { //update the separator state
                int iWidth = sz.width() + itemSpacing;
                if (separator == -1)
                    separator_start += iWidth;
                else
                    separator_len += iWidth;
            }
            //maximum height
            max_item_height = qMax(max_item_height, sz.height());
            //append
            actionRects[i] = QRect(0, 0, sz.width(), sz.height());
        }
    }
 
    //calculate position
    const int fw = q->style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, nullptr, q);
    int x = fw + ((start == -1) ? hmargin : start) + itemSpacing;
    int y = fw + vmargin;
    for(int i = 0; i < actions.size(); i++) {
        QRect &rect = actionRects[i];
        if (rect.isNull())
            continue;
 
        //resize
        rect.setHeight(max_item_height);
 
        //move
        if (separator != -1 && i >= separator) { //after the separator
            int left = (max_width - separator_len - hmargin - itemSpacing) + (x - separator_start - hmargin);
            if (left < separator_start) { //wrap
                separator_start = x = hmargin;
                y += max_item_height;
            }
            rect.moveLeft(left);
        } else {
            rect.moveLeft(x);
        }
        rect.moveTop(y);
 
        //keep moving along..
        x += rect.width() + itemSpacing;
 
        //make sure we follow the layout direction
        rect = QStyle::visualRect(q->layoutDirection(), q->rect(), rect);
    }
}
 
void QMenuBarPrivate::activateAction(QAction *action, QAction::ActionEvent action_e)
{
    Q_Q(QMenuBar);
    if (!action || !action->isEnabled())
        return;
    action->activate(action_e);
    if (action_e == QAction::Hover)
        action->showStatusText(q);
 
//     if (action_e == QAction::Trigger)
//         emit q->activated(action);
//     else if (action_e == QAction::Hover)
//         emit q->highlighted(action);
}
 
 
void QMenuBarPrivate::_q_actionTriggered()
{
    Q_Q(QMenuBar);
    if (QAction *action = qobject_cast<QAction *>(q->sender())) {
        emit q->triggered(action);
    }
}
 
void QMenuBarPrivate::_q_actionHovered()
{
    Q_Q(QMenuBar);
    if (QAction *action = qobject_cast<QAction *>(q->sender())) {
        emit q->hovered(action);
#if QT_CONFIG(accessibility)
        if (QAccessible::isActive()) {
            int actionIndex = actions.indexOf(action);
            QAccessibleEvent focusEvent(q, QAccessible::Focus);
            focusEvent.setChild(actionIndex);
            QAccessible::updateAccessibility(&focusEvent);
        }
#endif // QT_CONFIG(accessibility)
    }
}
 
void QMenuBar::initStyleOption(QStyleOptionMenuItem *option, const QAction *action) const
{
    if (!option || !action)
        return;
    Q_D(const QMenuBar);
    option->palette = palette();
    option->state = QStyle::State_None;
    if (isEnabled() && action->isEnabled())
        option->state |= QStyle::State_Enabled;
    else
        option->palette.setCurrentColorGroup(QPalette::Disabled);
    option->fontMetrics = fontMetrics();
    if (d->currentAction && d->currentAction == action) {
        option->state |= QStyle::State_Selected;
        if (d->popupState && !d->closePopupMode)
            option->state |= QStyle::State_Sunken;
    }
    if (hasFocus() || d->currentAction)
        option->state |= QStyle::State_HasFocus;
    option->menuRect = rect();
    option->menuItemType = QStyleOptionMenuItem::Normal;
    option->checkType = QStyleOptionMenuItem::NotCheckable;
    option->text = action->text();
    option->icon = action->icon();
}
 
void QMenuBarPrivate::init()
{
    Q_Q(QMenuBar);
    q->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Minimum);
    q->setAttribute(Qt::WA_CustomWhatsThis);
 
    if (!QCoreApplication::testAttribute(Qt::AA_DontUseNativeMenuBar))
        platformMenuBar = QGuiApplicationPrivate::platformTheme()->createPlatformMenuBar();
 
    if (platformMenuBar)
        q->hide();
    q->setBackgroundRole(QPalette::Button);
    handleReparent();
    q->setMouseTracking(q->style()->styleHint(QStyle::SH_MenuBar_MouseTracking, nullptr, q));
 
    extension = new QMenuBarExtension(q);
    extension->setFocusPolicy(Qt::NoFocus);
    extension->hide();
}
 
//Gets the next action for keyboard navigation
QAction *QMenuBarPrivate::getNextAction(const int _start, const int increment) const
{
    Q_Q(const QMenuBar);
    const_cast<QMenuBarPrivate*>(this)->updateGeometries();
    bool allowActiveAndDisabled = q->style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, nullptr, q);
    const int start = (_start == -1 && increment == -1) ? actions.size() : _start;
    const int end =  increment == -1 ? 0 : actions.size() - 1;
 
    for (int i = start; i != end;) {
        i += increment;
        QAction *current = actions.at(i);
        if (!actionRects.at(i).isNull() && (allowActiveAndDisabled || current->isEnabled()))
            return current;
    }
 
    if (_start != -1) //let's try from the beginning or the end
        return getNextAction(-1, increment);
 
    return nullptr;
}
 
QMenuBar::QMenuBar(QWidget *parent) : QWidget(*new QMenuBarPrivate, parent, { })
{
    Q_D(QMenuBar);
    d->init();
}
 
 
QMenuBar::~QMenuBar()
{
    Q_D(QMenuBar);
    delete d->platformMenuBar;
    d->platformMenuBar = nullptr;
}
 
QMenu *QMenuBar::addMenu(const QString &title)
{
    QMenu *menu = new QMenu(title, this);
    addAction(menu->menuAction());
    return menu;
}
 
QMenu *QMenuBar::addMenu(const QIcon &icon, const QString &title)
{
    QMenu *menu = new QMenu(title, this);
    menu->setIcon(icon);
    addAction(menu->menuAction());
    return menu;
}
 
QAction *QMenuBar::addMenu(QMenu *menu)
{
    QAction *action = menu->menuAction();
    addAction(action);
    return action;
}
 
QAction *QMenuBar::addSeparator()
{
    QAction *ret = new QAction(this);
    ret->setSeparator(true);
    addAction(ret);
    return ret;
}
 
QAction *QMenuBar::insertSeparator(QAction *before)
{
    QAction *action = new QAction(this);
    action->setSeparator(true);
    insertAction(before, action);
    return action;
}
 
QAction *QMenuBar::insertMenu(QAction *before, QMenu *menu)
{
    QAction *action = menu->menuAction();
    insertAction(before, action);
    return action;
}
 
QAction *QMenuBar::activeAction() const
{
    Q_D(const QMenuBar);
    return d->currentAction;
}
 
void QMenuBar::setActiveAction(QAction *act)
{
    Q_D(QMenuBar);
    d->setCurrentAction(act, true, false);
}
 
 
void QMenuBar::clear()
{
    QList<QAction*> acts = actions();
    for(int i = 0; i < acts.size(); i++)
        removeAction(acts[i]);
}
 
void QMenuBar::setDefaultUp(bool b)
{
    Q_D(QMenuBar);
    d->defaultPopDown = !b;
}
 
bool QMenuBar::isDefaultUp() const
{
    Q_D(const QMenuBar);
    return !d->defaultPopDown;
}
 
void QMenuBar::resizeEvent(QResizeEvent *)
{
    Q_D(QMenuBar);
    d->itemsDirty = true;
    d->updateGeometries();
}
 
void QMenuBar::paintEvent(QPaintEvent *e)
{
    Q_D(QMenuBar);
    QPainter p(this);
    QRegion emptyArea(rect());
 
    //draw the items
    for (int i = 0; i < d->actions.size(); ++i) {
        QAction *action = d->actions.at(i);
        QRect adjustedActionRect = d->actionRect(action);
        if (adjustedActionRect.isEmpty() || !d->isVisible(action))
            continue;
        if (!e->rect().intersects(adjustedActionRect))
            continue;
 
        emptyArea -= adjustedActionRect;
        QStyleOptionMenuItem opt;
        initStyleOption(&opt, action);
        opt.rect = adjustedActionRect;
        p.setClipRect(adjustedActionRect);
        style()->drawControl(QStyle::CE_MenuBarItem, &opt, &p, this);
    }
     //draw border
    if (int fw = style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, nullptr, this)) {
        QRegion borderReg;
        borderReg += QRect(0, 0, fw, height()); //left
        borderReg += QRect(width()-fw, 0, fw, height()); //right
        borderReg += QRect(0, 0, width(), fw); //top
        borderReg += QRect(0, height()-fw, width(), fw); //bottom
        p.setClipRegion(borderReg);
        emptyArea -= borderReg;
        QStyleOptionFrame frame;
        frame.rect = rect();
        frame.palette = palette();
        frame.state = QStyle::State_None;
        frame.lineWidth = style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, &frame, this);
        frame.midLineWidth = 0;
        style()->drawPrimitive(QStyle::PE_PanelMenuBar, &frame, &p, this);
    }
    p.setClipRegion(emptyArea);
    QStyleOptionMenuItem menuOpt;
    menuOpt.palette = palette();
    menuOpt.state = QStyle::State_None;
    menuOpt.menuItemType = QStyleOptionMenuItem::EmptyArea;
    menuOpt.checkType = QStyleOptionMenuItem::NotCheckable;
    menuOpt.rect = rect();
    menuOpt.menuRect = rect();
    style()->drawControl(QStyle::CE_MenuBarEmptyArea, &menuOpt, &p, this);
}
 
void QMenuBar::setVisible(bool visible)
{
    if (isNativeMenuBar()) {
        if (!visible)
            QWidget::setVisible(false);
        return;
    }
    QWidget::setVisible(visible);
}
 
void QMenuBar::mousePressEvent(QMouseEvent *e)
{
    Q_D(QMenuBar);
    if (e->button() != Qt::LeftButton)
        return;
 
    d->mouseDown = true;
 
    QAction *action = d->actionAt(e->position().toPoint());
    if (!action || !d->isVisible(action) || !action->isEnabled()) {
        d->setCurrentAction(nullptr);
#if QT_CONFIG(whatsthis)
        if (QWhatsThis::inWhatsThisMode())
            QWhatsThis::showText(e->globalPosition().toPoint(), d->whatsThis, this);
#endif
        return;
    }
 
    if (d->currentAction == action && d->popupState) {
        if (QMenu *menu = d->activeMenu) {
            d->activeMenu = nullptr;
            menu->setAttribute(Qt::WA_NoMouseReplay);
            menu->hide();
        }
    } else {
        d->setCurrentAction(action, true);
    }
}
 
void QMenuBar::mouseReleaseEvent(QMouseEvent *e)
{
    Q_D(QMenuBar);
    if (e->button() != Qt::LeftButton || !d->mouseDown)
        return;
 
    d->mouseDown = false;
    QAction *action = d->actionAt(e->position().toPoint());
 
    // do noting if the action is hidden
    if (!d->isVisible(action))
        return;
    if ((d->closePopupMode && action == d->currentAction) || !action || !action->menu()) {
        //we set the current action before activating
        //so that we let the leave event set the current back to 0
        d->setCurrentAction(action, false);
        if (action)
            d->activateAction(action, QAction::Trigger);
    }
    d->closePopupMode = 0;
}
 
void QMenuBar::keyPressEvent(QKeyEvent *e)
{
    Q_D(QMenuBar);
    d->updateGeometries();
    int key = e->key();
    if (isRightToLeft()) {  // in reverse mode open/close key for submenues are reversed
        if (key == Qt::Key_Left)
            key = Qt::Key_Right;
        else if (key == Qt::Key_Right)
            key = Qt::Key_Left;
    }
    if (key == Qt::Key_Tab) //means right
        key = Qt::Key_Right;
    else if (key == Qt::Key_Backtab) //means left
        key = Qt::Key_Left;
 
    bool key_consumed = false;
    switch(key) {
    case Qt::Key_Up:
    case Qt::Key_Down:
    case Qt::Key_Enter:
    case Qt::Key_Space:
    case Qt::Key_Return: {
        if (!style()->styleHint(QStyle::SH_MenuBar_AltKeyNavigation, nullptr, this) || !d->currentAction)
           break;
        if (d->currentAction->menu()) {
            d->popupAction(d->currentAction, true);
        } else if (key == Qt::Key_Enter || key == Qt::Key_Return || key == Qt::Key_Space) {
            d->activateAction(d->currentAction, QAction::Trigger);
            d->setCurrentAction(d->currentAction, false);
            d->setKeyboardMode(false);
        }
        key_consumed = true;
        break; }
 
    case Qt::Key_Right:
    case Qt::Key_Left: {
        if (d->currentAction) {
            int index = d->actions.indexOf(d->currentAction);
            if (QAction *nextAction = d->getNextAction(index, key == Qt::Key_Left ? -1 : +1)) {
                d->setCurrentAction(nextAction, d->popupState, true);
                key_consumed = true;
            }
        }
        break; }
 
    default:
        key_consumed = false;
    }
 
#ifndef QT_NO_SHORTCUT
    if (!key_consumed && e->matches(QKeySequence::Cancel)) {
        d->setCurrentAction(nullptr);
        d->setKeyboardMode(false);
        key_consumed = true;
    }
#endif
 
    if (!key_consumed &&
       (!e->modifiers() ||
        (e->modifiers()&(Qt::MetaModifier|Qt::AltModifier))) && e->text().size()==1 && !d->popupState) {
        int clashCount = 0;
        QAction *first = nullptr, *currentSelected = nullptr, *firstAfterCurrent = nullptr;
        {
            const QChar c = e->text().at(0).toUpper();
            for(int i = 0; i < d->actions.size(); ++i) {
                if (d->actionRects.at(i).isNull())
                    continue;
                QAction *act = d->actions.at(i);
                QString s = act->text();
                if (!s.isEmpty()) {
                    qsizetype ampersand = s.indexOf(u'&');
                    if (ampersand >= 0) {
                        if (s[ampersand+1].toUpper() == c) {
                            clashCount++;
                            if (!first)
                                first = act;
                            if (act == d->currentAction)
                                currentSelected = act;
                            else if (!firstAfterCurrent && currentSelected)
                                firstAfterCurrent = act;
                        }
                    }
                }
            }
        }
        QAction *next_action = nullptr;
        if (clashCount >= 1) {
            if (clashCount == 1 || !d->currentAction || (currentSelected && !firstAfterCurrent))
                next_action = first;
            else
                next_action = firstAfterCurrent;
        }
        if (next_action) {
            key_consumed = true;
            d->setCurrentAction(next_action, true, true);
        }
    }
    if (key_consumed)
        e->accept();
    else
        e->ignore();
}
 
void QMenuBar::mouseMoveEvent(QMouseEvent *e)
{
    Q_D(QMenuBar);
    if (!(e->buttons() & Qt::LeftButton)) {
        d->mouseDown = false;
        // We receive mouse move and mouse press on touch.
        // Mouse move will open the menu and mouse press
        // will close it, so ignore mouse move.
        if (e->source() != Qt::MouseEventNotSynthesized)
            return;
    }
 
    bool popupState = d->popupState || d->mouseDown;
    QAction *action = d->actionAt(e->position().toPoint());
    if ((action && d->isVisible(action)) || !popupState)
        d->setCurrentAction(action, popupState);
}
 
void QMenuBar::leaveEvent(QEvent *)
{
    Q_D(QMenuBar);
    if ((!hasFocus() && !d->popupState) ||
        (d->currentAction && d->currentAction->menu() == nullptr))
        d->setCurrentAction(nullptr);
}
 
QPlatformMenu *QMenuBarPrivate::getPlatformMenu(const QAction *action)
{
    if (!action || !action->menu())
        return nullptr;
 
    QPlatformMenu *platformMenu = action->menu()->platformMenu();
    if (!platformMenu && platformMenuBar) {
        platformMenu = platformMenuBar->createMenu();
        if (platformMenu)
            action->menu()->setPlatformMenu(platformMenu);
    }
 
    return platformMenu;
}
 
QPlatformMenu *QMenuBarPrivate::findInsertionPlatformMenu(const QAction *action)
{
    Q_Q(QMenuBar);
    QPlatformMenu *beforeMenu = nullptr;
    for (int beforeIndex = indexOf(const_cast<QAction *>(action)) + 1;
         !beforeMenu && (beforeIndex < q->actions().size());
         ++beforeIndex) {
        beforeMenu = getPlatformMenu(q->actions().at(beforeIndex));
    }
 
    return beforeMenu;
}
 
void QMenuBarPrivate::copyActionToPlatformMenu(const QAction *action, QPlatformMenu *menu)
{
    const auto tag = reinterpret_cast<quintptr>(action);
    if (menu->tag() != tag)
        menu->setTag(tag);
    menu->setText(action->text());
    menu->setVisible(action->isVisible());
    menu->setEnabled(action->isEnabled());
}
 
void QMenuBar::actionEvent(QActionEvent *e)
{
    Q_D(QMenuBar);
    d->itemsDirty = true;
 
    if (d->platformMenuBar) {
        QPlatformMenuBar *nativeMenuBar = d->platformMenuBar;
        if (!nativeMenuBar)
            return;
 
        auto action = static_cast<QAction *>(e->action());
        if (e->type() == QEvent::ActionAdded) {
            QPlatformMenu *menu = d->getPlatformMenu(action);
            if (menu) {
                d->copyActionToPlatformMenu(action, menu);
 
                QPlatformMenu *beforeMenu = d->findInsertionPlatformMenu(action);
                d->platformMenuBar->insertMenu(menu, beforeMenu);
            }
        } else if (e->type() == QEvent::ActionRemoved) {
            QPlatformMenu *menu = d->getPlatformMenu(action);
            if (menu)
                d->platformMenuBar->removeMenu(menu);
        } else if (e->type() == QEvent::ActionChanged) {
            QPlatformMenu *cur = d->platformMenuBar->menuForTag(reinterpret_cast<quintptr>(e->action()));
            QPlatformMenu *menu = d->getPlatformMenu(action);
 
            // the menu associated with the action can change, need to
            // remove and/or insert the new platform menu
            if (menu != cur) {
                if (cur)
                    d->platformMenuBar->removeMenu(cur);
                if (menu) {
                    d->copyActionToPlatformMenu(action, menu);
 
                    QPlatformMenu *beforeMenu = d->findInsertionPlatformMenu(action);
                    d->platformMenuBar->insertMenu(menu, beforeMenu);
                }
            } else if (menu) {
                d->copyActionToPlatformMenu(action, menu);
                d->platformMenuBar->syncMenu(menu);
            }
        }
    }
 
    if (e->type() == QEvent::ActionAdded) {
        connect(e->action(), SIGNAL(triggered()), this, SLOT(_q_actionTriggered()));
        connect(e->action(), SIGNAL(hovered()), this, SLOT(_q_actionHovered()));
    } else if (e->type() == QEvent::ActionRemoved) {
        e->action()->disconnect(this);
    }
    // updateGeometries() is also needed for native menu bars because
    // it updates shortcutIndexMap
    if (isVisible() || isNativeMenuBar())
        d->updateGeometries();
    if (isVisible())
        update();
}
 
void QMenuBar::focusInEvent(QFocusEvent *)
{
    Q_D(QMenuBar);
    if (d->keyboardState)
        d->focusFirstAction();
}
 
void QMenuBar::focusOutEvent(QFocusEvent *)
{
    Q_D(QMenuBar);
    if (!d->popupState) {
        d->setCurrentAction(nullptr);
        d->setKeyboardMode(false);
    }
}
 
void QMenuBar::timerEvent (QTimerEvent *e)
{
    Q_D(QMenuBar);
    if (e->timerId() == d->autoReleaseTimer.timerId()) {
        d->autoReleaseTimer.stop();
        d->setCurrentAction(nullptr);
    }
    QWidget::timerEvent(e);
}
 
 
void QMenuBarPrivate::handleReparent()
{
    Q_Q(QMenuBar);
    QWidget *newParent = q->parentWidget();
 
    //Note: if parent is reparented, then window may change even if parent doesn't.
    // We need to install an avent filter on each parent up to the parent that is
    // also a window (for shortcuts)
    QWidget *newWindow = newParent ? newParent->window() : nullptr;
 
    QList<QPointer<QWidget>> newParents;
    // Remove event filters on ex-parents, keep them on still-parents
    // The parents are always ordered in the vector
    //
    // Take a copy because this method is called from changeEvent() and eventFilter(),
    // which might cause recursion into the class due to event processing, which might
    // modify oldParents.
    const auto copy = oldParents;
    for (const QPointer<QWidget> &w : copy) {
        if (w) {
            if (newParent == w) {
                newParents.append(w);
                if (newParent != newWindow) //stop at the window
                    newParent = newParent->parentWidget();
            } else {
                w->removeEventFilter(q);
            }
        }
    }
 
    // At this point, newParent is the next one to be added to newParents
    while (newParent && newParent != newWindow) {
        //install event filters all the way up to (excluding) the window
        newParents.append(newParent);
        newParent->installEventFilter(q);
        newParent = newParent->parentWidget();
    }
 
    if (newParent && newWindow) {
        // Install the event filter on the window
        newParents.append(newParent);
        newParent->installEventFilter(q);
    }
    oldParents = newParents;
 
    if (platformMenuBar) {
        if (newWindow) {
            // force the underlying platform window to be created, since
            // the platform menubar needs it (and we have no other way to
            // discover when the platform window is created)
            newWindow->createWinId();
            platformMenuBar->handleReparent(newWindow->windowHandle());
        } else {
            platformMenuBar->handleReparent(nullptr);
        }
    }
}
 
void QMenuBar::changeEvent(QEvent *e)
{
    Q_D(QMenuBar);
    if (e->type() == QEvent::StyleChange) {
        d->itemsDirty = true;
        setMouseTracking(style()->styleHint(QStyle::SH_MenuBar_MouseTracking, nullptr, this));
        if (parentWidget())
            resize(parentWidget()->width(), heightForWidth(parentWidget()->width()));
        d->updateGeometries();
    } else if (e->type() == QEvent::ParentChange) {
        d->handleReparent();
    } else if (e->type() == QEvent::FontChange
               || e->type() == QEvent::ApplicationFontChange) {
        d->itemsDirty = true;
        d->updateGeometries();
    }
 
    QWidget::changeEvent(e);
}
 
bool QMenuBar::event(QEvent *e)
{
    Q_D(QMenuBar);
    switch (e->type()) {
    case QEvent::KeyPress: {
        QKeyEvent *ke = static_cast<QKeyEvent *>(e);
#if 0
        if (!d->keyboardState) { //all keypresses..
            d->setCurrentAction(0);
            return ;
        }
#endif
        if (ke->key() == Qt::Key_Tab || ke->key() == Qt::Key_Backtab) {
            keyPressEvent(ke);
            return true;
        }
 
    } break;
#ifndef QT_NO_SHORTCUT
    case QEvent::Shortcut: {
        QShortcutEvent *se = static_cast<QShortcutEvent *>(e);
        int shortcutId = se->shortcutId();
        for(int j = 0; j < d->shortcutIndexMap.size(); ++j) {
            if (shortcutId == d->shortcutIndexMap.value(j))
                d->_q_internalShortcutActivated(j);
        }
    } break;
#endif
    case QEvent::Show:
        d->_q_updateLayout();
    break;
#ifndef QT_NO_SHORTCUT
    case QEvent::ShortcutOverride: {
        QKeyEvent *kev = static_cast<QKeyEvent *>(e);
        //we only filter out escape if there is a current action
        if (kev->matches(QKeySequence::Cancel) && d->currentAction) {
            e->accept();
            return true;
        }
    }
    break;
#endif
#if QT_CONFIG(whatsthis)
    case QEvent::QueryWhatsThis:
        e->setAccepted(d->whatsThis.size());
        if (QAction *action = d->actionAt(static_cast<QHelpEvent*>(e)->pos())) {
            if (action->whatsThis().size() || action->menu())
                e->accept();
        }
        return true;
#endif
    case QEvent::LayoutDirectionChange:
        d->_q_updateLayout();
        break;
    default:
        break;
    }
    return QWidget::event(e);
}
 
bool QMenuBar::eventFilter(QObject *object, QEvent *event)
{
    Q_D(QMenuBar);
    if (object && (event->type() == QEvent::ParentChange)) //GrandparentChange
            d->handleReparent();
 
    if (object == d->leftWidget || object == d->rightWidget) {
        switch (event->type()) {
        case QEvent::ShowToParent:
        case QEvent::HideToParent:
            d->_q_updateLayout();
            break;
        default:
            break;
        }
    }
 
    if (isNativeMenuBar() && event->type() == QEvent::ShowToParent) {
        // On some desktops like Unity, the D-Bus menu bar is unregistered
        // when the window is hidden. So when the window is shown, we need
        // to forcefully re-register it. The only way to force re-registering
        // with D-Bus menu is the handleReparent method.
        QWidget *widget = qobject_cast<QWidget *>(object);
        QWindow *handle = widget ? widget->windowHandle() : nullptr;
        if (handle != nullptr)
            d->platformMenuBar->handleReparent(handle);
    }
 
    if (style()->styleHint(QStyle::SH_MenuBar_AltKeyNavigation, nullptr, this)) {
        if (d->altPressed) {
            switch (event->type()) {
            case QEvent::KeyPress:
            case QEvent::KeyRelease:
            {
                QKeyEvent *kev = static_cast<QKeyEvent*>(event);
                if (kev->key() == Qt::Key_Alt || kev->key() == Qt::Key_Meta) {
                    if (event->type() == QEvent::KeyPress) // Alt-press does not interest us, we have the shortcut-override event
                        break;
                    d->setKeyboardMode(!d->keyboardState);
                }
            }
            Q_FALLTHROUGH();
            case QEvent::MouseButtonPress:
            case QEvent::MouseButtonRelease:
            case QEvent::MouseMove:
            case QEvent::FocusIn:
            case QEvent::FocusOut:
            case QEvent::ActivationChange:
            case QEvent::Shortcut:
                d->altPressed = false;
                qApp->removeEventFilter(this);
                break;
            default:
                break;
            }
        } else if (isVisible()) {
            if (event->type() == QEvent::ShortcutOverride) {
                QKeyEvent *kev = static_cast<QKeyEvent*>(event);
                if ((kev->key() == Qt::Key_Alt || kev->key() == Qt::Key_Meta)
                    && kev->modifiers() == Qt::AltModifier) {
                    d->altPressed = true;
                    qApp->installEventFilter(this);
                }
            }
        }
    }
 
    return false;
}
 
QAction *QMenuBar::actionAt(const QPoint &pt) const
{
    Q_D(const QMenuBar);
    return d->actionAt(pt);
}
 
QRect QMenuBar::actionGeometry(QAction *act) const
{
    Q_D(const QMenuBar);
    return d->actionRect(act);
}
 
QSize QMenuBar::minimumSizeHint() const
{
    Q_D(const QMenuBar);
    const bool as_gui_menubar = !isNativeMenuBar();
 
    ensurePolished();
    QSize ret(0, 0);
    const_cast<QMenuBarPrivate*>(d)->updateGeometries();
    const int hmargin = style()->pixelMetric(QStyle::PM_MenuBarHMargin, nullptr, this);
    const int vmargin = style()->pixelMetric(QStyle::PM_MenuBarVMargin, nullptr, this);
    int fw = style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, nullptr, this);
    int spaceBelowMenuBar = style()->styleHint(QStyle::SH_MainWindow_SpaceBelowMenuBar, nullptr, this);
    if (as_gui_menubar) {
        int w = parentWidget() ? parentWidget()->width() : QGuiApplication::primaryScreen()->virtualGeometry().width();
        d->calcActionRects(w - (2 * fw), 0);
        for (int i = 0; ret.isNull() && i < d->actions.size(); ++i)
            ret = d->actionRects.at(i).size();
        if (!d->extension->isHidden())
            ret += QSize(d->extension->sizeHint().width(), 0);
        ret += QSize(2*fw + hmargin, 2*fw + vmargin);
    }
    int margin = 2*vmargin + 2*fw + spaceBelowMenuBar;
    if (d->leftWidget) {
        QSize sz = d->leftWidget->minimumSizeHint();
        ret.setWidth(ret.width() + sz.width());
        if (sz.height() + margin > ret.height())
            ret.setHeight(sz.height() + margin);
    }
    if (d->rightWidget) {
        QSize sz = d->rightWidget->minimumSizeHint();
        ret.setWidth(ret.width() + sz.width());
        if (sz.height() + margin > ret.height())
            ret.setHeight(sz.height() + margin);
    }
    if (as_gui_menubar) {
        QStyleOptionMenuItem opt;
        opt.rect = rect();
        opt.menuRect = rect();
        opt.state = QStyle::State_None;
        opt.menuItemType = QStyleOptionMenuItem::Normal;
        opt.checkType = QStyleOptionMenuItem::NotCheckable;
        opt.palette = palette();
        return style()->sizeFromContents(QStyle::CT_MenuBar, &opt, ret, this);
    }
    return ret;
}
 
QSize QMenuBar::sizeHint() const
{
    Q_D(const QMenuBar);
    const bool as_gui_menubar = !isNativeMenuBar();
 
    ensurePolished();
    QSize ret(0, 0);
    const_cast<QMenuBarPrivate*>(d)->updateGeometries();
    const int hmargin = style()->pixelMetric(QStyle::PM_MenuBarHMargin, nullptr, this);
    const int vmargin = style()->pixelMetric(QStyle::PM_MenuBarVMargin, nullptr, this);
    int fw = style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, nullptr, this);
    int spaceBelowMenuBar = style()->styleHint(QStyle::SH_MainWindow_SpaceBelowMenuBar, nullptr, this);
    if (as_gui_menubar) {
        const int w = parentWidget() ? parentWidget()->width() : QGuiApplication::primaryScreen()->virtualGeometry().width();
        d->calcActionRects(w - (2 * fw), 0);
        for (int i = 0; i < d->actionRects.size(); ++i) {
            const QRect &actionRect = d->actionRects.at(i);
            ret = ret.expandedTo(QSize(actionRect.x() + actionRect.width(), actionRect.y() + actionRect.height()));
        }
        //the action geometries already contain the top and left
        //margins. So we only need to add those from right and bottom.
        ret += QSize(fw + hmargin, fw + vmargin);
    }
    int margin = 2*vmargin + 2*fw + spaceBelowMenuBar;
    if (d->leftWidget) {
        QSize sz = d->leftWidget->sizeHint();
        sz.rheight() += margin;
        ret = ret.expandedTo(sz);
    }
    if (d->rightWidget) {
        QSize sz = d->rightWidget->sizeHint();
        ret.setWidth(ret.width() + sz.width());
        if (sz.height() + margin > ret.height())
            ret.setHeight(sz.height() + margin);
    }
    if (as_gui_menubar) {
        QStyleOptionMenuItem opt;
        opt.rect = rect();
        opt.menuRect = rect();
        opt.state = QStyle::State_None;
        opt.menuItemType = QStyleOptionMenuItem::Normal;
        opt.checkType = QStyleOptionMenuItem::NotCheckable;
        opt.palette = palette();
        return style()->sizeFromContents(QStyle::CT_MenuBar, &opt, ret, this);
    }
    return ret;
}
 
int QMenuBar::heightForWidth(int) const
{
    Q_D(const QMenuBar);
    const bool as_gui_menubar = !isNativeMenuBar();
 
    const_cast<QMenuBarPrivate*>(d)->updateGeometries();
    int height = 0;
    const int vmargin = style()->pixelMetric(QStyle::PM_MenuBarVMargin, nullptr, this);
    int fw = style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, nullptr, this);
    int spaceBelowMenuBar = style()->styleHint(QStyle::SH_MainWindow_SpaceBelowMenuBar, nullptr, this);
    if (as_gui_menubar) {
        for (int i = 0; i < d->actionRects.size(); ++i)
            height = qMax(height, d->actionRects.at(i).height());
        if (height) //there is at least one non-null item
            height += spaceBelowMenuBar;
        height += 2*fw;
        height += 2*vmargin;
    }
    int margin = 2*vmargin + 2*fw + spaceBelowMenuBar;
    if (d->leftWidget)
        height = qMax(d->leftWidget->sizeHint().height() + margin, height);
    if (d->rightWidget)
        height = qMax(d->rightWidget->sizeHint().height() + margin, height);
    if (as_gui_menubar) {
        QStyleOptionMenuItem opt;
        opt.initFrom(this);
        opt.menuRect = rect();
        opt.state = QStyle::State_None;
        opt.menuItemType = QStyleOptionMenuItem::Normal;
        opt.checkType = QStyleOptionMenuItem::NotCheckable;
        return style()->sizeFromContents(QStyle::CT_MenuBar, &opt, QSize(0, height), this).height(); //not pretty..
    }
    return height;
}
 
void QMenuBarPrivate::_q_internalShortcutActivated(int id)
{
    Q_Q(QMenuBar);
    QAction *act = actions.at(id);
    if (act && act->menu()) {
        if (QPlatformMenu *platformMenu = act->menu()->platformMenu()) {
            platformMenu->showPopup(q->windowHandle(), actionRects.at(id), nullptr);
            return;
        }
    }
 
    keyboardFocusWidget = QApplication::focusWidget();
    setCurrentAction(act, true, true);
    if (act && !act->menu()) {
        activateAction(act, QAction::Trigger);
        //100 is the same as the default value in QPushButton::animateClick
        autoReleaseTimer.start(100, q);
    } else if (act && q->style()->styleHint(QStyle::SH_MenuBar_AltKeyNavigation, nullptr, q)) {
        // When we open a menu using a shortcut, we should end up in keyboard state
        setKeyboardMode(true);
    }
}
 
void QMenuBarPrivate::_q_updateLayout()
{
    Q_Q(QMenuBar);
    itemsDirty = true;
    if (q->isVisible()) {
        updateGeometries();
        q->update();
    }
}
 
void QMenuBar::setCornerWidget(QWidget *w, Qt::Corner corner)
{
    Q_D(QMenuBar);
    switch (corner) {
    case Qt::TopLeftCorner:
        if (d->leftWidget)
            d->leftWidget->removeEventFilter(this);
        d->leftWidget = w;
        break;
    case Qt::TopRightCorner:
        if (d->rightWidget)
            d->rightWidget->removeEventFilter(this);
        d->rightWidget = w;
        break;
    default:
        qWarning("QMenuBar::setCornerWidget: Only TopLeftCorner and TopRightCorner are supported");
        return;
    }
 
    if (w) {
        w->setParent(this);
        w->installEventFilter(this);
    }
 
    d->_q_updateLayout();
}
 
QWidget *QMenuBar::cornerWidget(Qt::Corner corner) const
{
    Q_D(const QMenuBar);
    QWidget *w = nullptr;
    switch(corner) {
    case Qt::TopLeftCorner:
        w = d->leftWidget;
        break;
    case Qt::TopRightCorner:
        w = d->rightWidget;
        break;
    default:
        qWarning("QMenuBar::cornerWidget: Only TopLeftCorner and TopRightCorner are supported");
        break;
    }
 
    return w;
}
 
void QMenuBar::setNativeMenuBar(bool nativeMenuBar)
{
    Q_D(QMenuBar);
    if (nativeMenuBar != bool(d->platformMenuBar)) {
        if (!nativeMenuBar) {
            delete d->platformMenuBar;
            d->platformMenuBar = nullptr;
            d->itemsDirty = true;
        } else {
            if (!d->platformMenuBar)
                d->platformMenuBar = QGuiApplicationPrivate::platformTheme()->createPlatformMenuBar();
        }
 
        updateGeometry();
        if (!nativeMenuBar && parentWidget())
            setVisible(true);
    }
}
 
bool QMenuBar::isNativeMenuBar() const
{
    Q_D(const QMenuBar);
    return bool(d->platformMenuBar);
}
 
QPlatformMenuBar *QMenuBar::platformMenuBar()
{
    Q_D(const QMenuBar);
    return d->platformMenuBar;
}
 
// for private slots
 
QT_END_NAMESPACE
 
#include <moc_qmenubar.cpp>