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**
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** accordance with the commercial license agreement provided with the
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#include "qmenu.h"

#ifndef QT_NO_MENU

#include "qdebug.h"
#include "qstyle.h"
#include "qevent.h"
#include "qtimer.h"
#include "qlayout.h"
#include "qpainter.h"
#include <qpa/qplatformtheme.h>
#ifdef Q_OS_OSX
#include "qmacnativewidget_mac.h"
#endif
#include "qapplication.h"
#include "qdesktopwidget.h"
#ifndef QT_NO_ACCESSIBILITY
# include "qaccessible.h"
#endif
#ifndef QT_NO_EFFECTS
# include <private/qeffects_p.h>
#endif
#ifndef QT_NO_WHATSTHIS
# include <qwhatsthis.h>
#endif

#include "qmenu_p.h"
#include "qmenubar_p.h"
#include "qwidgetaction.h"
#include "qtoolbutton.h"
#include "qpushbutton.h"
#include "qtooltip.h"
#include <private/qpushbutton_p.h>
#include <private/qaction_p.h>
#include <private/qguiapplication_p.h>

QT_BEGIN_NAMESPACE

QMenu *QMenuPrivate::mouseDown = 0;
QPointer<QMenu> QMenuPrivate::previousMouseMenu(Q_NULLPTR);
static void handleEnterLeaveEvents(QPointer<QMenu> *previous_ptr, QMenu *next)
{
    QWidget *previous = previous_ptr->data();
    if (previous != next) {
        if (previous) {
            QEvent leaveEvent(QEvent::Leave);
            QApplication::sendEvent(previous, &leaveEvent);
        }
        if (next) {
            QEvent enterEvent(QEvent::Enter);
            QApplication::sendEvent(next, &enterEvent);
        }
    }
    *previous_ptr = next;
}

/* QMenu code */
// internal class used for the torn off popup
class QTornOffMenu : public QMenu
{
    Q_OBJECT
    class QTornOffMenuPrivate : public QMenuPrivate
    {
        Q_DECLARE_PUBLIC(QMenu)
    public:
        QTornOffMenuPrivate(QMenu *p) : causedMenu(p) {
            tornoff = 1;
            causedPopup.widget = 0;
            causedPopup.action = ((QTornOffMenu*)p)->d_func()->causedPopup.action;
            causedStack = ((QTornOffMenu*)p)->d_func()->calcCausedStack();
        }
        QList<QPointer<QWidget> > calcCausedStack() const Q_DECL_OVERRIDE { return causedStack; }
        QPointer<QMenu> causedMenu;
        QList<QPointer<QWidget> > causedStack;
    };
public:
    QTornOffMenu(QMenu *p) : QMenu(*(new QTornOffMenuPrivate(p)))
    {
        Q_D(QTornOffMenu);
        // make the torn-off menu a sibling of p (instead of a child)
        QWidget *parentWidget = d->causedStack.isEmpty() ? p : d->causedStack.last();
        if (parentWidget->parentWidget())
            parentWidget = parentWidget->parentWidget();
        setParent(parentWidget, Qt::Window | Qt::Tool);
        setAttribute(Qt::WA_DeleteOnClose, true);
        setAttribute(Qt::WA_X11NetWmWindowTypeMenu, true);
        setWindowTitle(p->windowTitle());
        setEnabled(p->isEnabled());
        //QObject::connect(this, SIGNAL(triggered(QAction*)), this, SLOT(onTrigger(QAction*)));
        //QObject::connect(this, SIGNAL(hovered(QAction*)), this, SLOT(onHovered(QAction*)));
        QList<QAction*> items = p->actions();
        for(int i = 0; i < items.count(); i++)
            addAction(items.at(i));
    }
    void syncWithMenu(QMenu *menu, QActionEvent *act)
    {
        Q_D(QTornOffMenu);
        if(menu != d->causedMenu)
            return;
        if (act->type() == QEvent::ActionAdded) {
            insertAction(act->before(), act->action());
        } else if (act->type() == QEvent::ActionRemoved)
            removeAction(act->action());
    }
    void actionEvent(QActionEvent *e) Q_DECL_OVERRIDE
    {
        QMenu::actionEvent(e);
        setFixedSize(sizeHint());
    }
public slots:
    void onTrigger(QAction *action) { d_func()->activateAction(action, QAction::Trigger, false); }
    void onHovered(QAction *action) { d_func()->activateAction(action, QAction::Hover, false); }
private:
    Q_DECLARE_PRIVATE(QTornOffMenu)
    friend class QMenuPrivate;
};

void QMenuPrivate::init()
{
    Q_Q(QMenu);
#ifndef QT_NO_WHATSTHIS
    q->setAttribute(Qt::WA_CustomWhatsThis);
#endif
    q->setAttribute(Qt::WA_X11NetWmWindowTypePopupMenu);
    defaultMenuAction = menuAction = new QAction(q);
    menuAction->d_func()->menu = q;
    q->setMouseTracking(q->style()->styleHint(QStyle::SH_Menu_MouseTracking, 0, q));
    if (q->style()->styleHint(QStyle::SH_Menu_Scrollable, 0, q)) {
        scroll = new QMenuPrivate::QMenuScroller;
        scroll->scrollFlags = QMenuPrivate::QMenuScroller::ScrollNone;
    }

    setPlatformMenu(QGuiApplicationPrivate::platformTheme()->createPlatformMenu());
    sloppyState.initialize(q);
    delayState.initialize(q);
    mousePopupDelay = q->style()->styleHint(QStyle::SH_Menu_SubMenuPopupDelay, 0, q);
}

void QMenuPrivate::setPlatformMenu(QPlatformMenu *menu)
{
    Q_Q(QMenu);
    if (!platformMenu.isNull() && !platformMenu->parent())
        delete platformMenu.data();

    platformMenu = menu;
    if (!platformMenu.isNull()) {
        QObject::connect(platformMenu, SIGNAL(aboutToShow()), q, SLOT(_q_platformMenuAboutToShow()));
        QObject::connect(platformMenu, SIGNAL(aboutToHide()), q, SIGNAL(aboutToHide()));
    }
}

// forward declare function
static void copyActionToPlatformItem(const QAction *action, QPlatformMenuItem *item, QPlatformMenu *itemsMenu);

void QMenuPrivate::syncPlatformMenu()
{
    Q_Q(QMenu);
    if (platformMenu.isNull())
        return;

    QPlatformMenuItem *beforeItem = Q_NULLPTR;
    QListIterator<QAction*> it(q->actions());
    it.toBack();
    while (it.hasPrevious()) {
        QPlatformMenuItem *menuItem = platformMenu->createMenuItem();
        QAction *action = it.previous();
        menuItem->setTag(reinterpret_cast<quintptr>(action));
        QObject::connect(menuItem, SIGNAL(activated()), action, SLOT(trigger()), Qt::QueuedConnection);
        QObject::connect(menuItem, SIGNAL(hovered()), action, SIGNAL(hovered()), Qt::QueuedConnection);
        copyActionToPlatformItem(action, menuItem, platformMenu.data());
        platformMenu->insertMenuItem(menuItem, beforeItem);
        beforeItem = menuItem;
    }
    platformMenu->syncSeparatorsCollapsible(collapsibleSeparators);
    platformMenu->setEnabled(q->isEnabled());
}

int QMenuPrivate::scrollerHeight() const
{
    Q_Q(const QMenu);
    return qMax(QApplication::globalStrut().height(), q->style()->pixelMetric(QStyle::PM_MenuScrollerHeight, 0, q));
}

//Windows and KDE allows menus to cover the taskbar, while GNOME and Mac don't
QRect QMenuPrivate::popupGeometry(const QWidget *widget) const
{
    if (QGuiApplicationPrivate::platformTheme() &&
            QGuiApplicationPrivate::platformTheme()->themeHint(QPlatformTheme::UseFullScreenForPopupMenu).toBool()) {
        return QApplication::desktop()->screenGeometry(widget);
    } else {
        return QApplication::desktop()->availableGeometry(widget);
    }
}

//Windows and KDE allows menus to cover the taskbar, while GNOME and Mac don't
QRect QMenuPrivate::popupGeometry(int screen) const
{
    if (QGuiApplicationPrivate::platformTheme() &&
            QGuiApplicationPrivate::platformTheme()->themeHint(QPlatformTheme::UseFullScreenForPopupMenu).toBool()) {
        return QApplication::desktop()->screenGeometry(screen);
    } else {
        return QApplication::desktop()->availableGeometry(screen);
    }
}

QList<QPointer<QWidget> > QMenuPrivate::calcCausedStack() const
{
    QList<QPointer<QWidget> > ret;
    for(QWidget *widget = causedPopup.widget; widget; ) {
        ret.append(widget);
        if (QTornOffMenu *qtmenu = qobject_cast<QTornOffMenu*>(widget))
            ret += qtmenu->d_func()->causedStack;
        if (QMenu *qmenu = qobject_cast<QMenu*>(widget))
            widget = qmenu->d_func()->causedPopup.widget;
        else
            break;
    }
    return ret;
}

void QMenuPrivate::updateActionRects() const
{
    Q_Q(const QMenu);
    updateActionRects(popupGeometry(q));
}

void QMenuPrivate::updateActionRects(const QRect &screen) const
{
    Q_Q(const QMenu);
    if (!itemsDirty)
        return;

    q->ensurePolished();

    //let's reinitialize the buffer
    actionRects.resize(actions.count());
    actionRects.fill(QRect());

    int lastVisibleAction = getLastVisibleAction();

    int max_column_width = 0,
        dh = screen.height(),
        y = 0;
    QStyle *style = q->style();
    QStyleOption opt;
    opt.init(q);
    const int hmargin = style->pixelMetric(QStyle::PM_MenuHMargin, &opt, q),
              vmargin = style->pixelMetric(QStyle::PM_MenuVMargin, &opt, q),
              icone = style->pixelMetric(QStyle::PM_SmallIconSize, &opt, q);
    const int fw = style->pixelMetric(QStyle::PM_MenuPanelWidth, &opt, q);
    const int deskFw = style->pixelMetric(QStyle::PM_MenuDesktopFrameWidth, &opt, q);
    const int tearoffHeight = tearoff ? style->pixelMetric(QStyle::PM_MenuTearoffHeight, &opt, q) : 0;

    //for compatibility now - will have to refactor this away
    tabWidth = 0;
    maxIconWidth = 0;
    hasCheckableItems = false;
    ncols = 1;

    for (int i = 0; i < actions.count(); ++i) {
        QAction *action = actions.at(i);
        if (action->isSeparator() || !action->isVisible() || widgetItems.contains(action))
            continue;
        //..and some members
        hasCheckableItems |= action->isCheckable();
        QIcon is = action->icon();
        if (!is.isNull()) {
            maxIconWidth = qMax<uint>(maxIconWidth, icone + 4);
        }
    }

    //calculate size
    QFontMetrics qfm = q->fontMetrics();
    bool previousWasSeparator = true; // this is true to allow removing the leading separators
    for(int i = 0; i <= lastVisibleAction; i++) {
        QAction *action = actions.at(i);
        const bool isSection = action->isSeparator() && (!action->text().isEmpty() || !action->icon().isNull());
        const bool isPlainSeparator = (isSection && !q->style()->styleHint(QStyle::SH_Menu_SupportsSections))
                                   || (action->isSeparator() && !isSection);

        if (!action->isVisible() ||
            (collapsibleSeparators && previousWasSeparator && isPlainSeparator))
            continue; // we continue, this action will get an empty QRect

        previousWasSeparator = isPlainSeparator;

        //let the style modify the above size..
        QStyleOptionMenuItem opt;
        q->initStyleOption(&opt, action);
        const QFontMetrics &fm = opt.fontMetrics;

        QSize sz;
        if (QWidget *w = widgetItems.value(action)) {
          sz = w->sizeHint().expandedTo(w->minimumSize()).expandedTo(w->minimumSizeHint()).boundedTo(w->maximumSize());
        } else {
            //calc what I think the size is..
            if (action->isSeparator()) {
                sz = QSize(2, 2);
            } else {
                QString s = action->text();
                int t = s.indexOf(QLatin1Char('\t'));
                if (t != -1) {
                    tabWidth = qMax(int(tabWidth), qfm.width(s.mid(t+1)));
                    s = s.left(t);
    #ifndef QT_NO_SHORTCUT
                } else {
                    QKeySequence seq = action->shortcut();
                    if (!seq.isEmpty())
                        tabWidth = qMax(int(tabWidth), qfm.width(seq.toString(QKeySequence::NativeText)));
    #endif
                }
                sz.setWidth(fm.boundingRect(QRect(), Qt::TextSingleLine | Qt::TextShowMnemonic, s).width());
                sz.setHeight(qMax(fm.height(), qfm.height()));

                QIcon is = action->icon();
                if (!is.isNull()) {
                    QSize is_sz = QSize(icone, icone);
                    if (is_sz.height() > sz.height())
                        sz.setHeight(is_sz.height());
                }
            }
            sz = style->sizeFromContents(QStyle::CT_MenuItem, &opt, sz, q);
        }


        if (!sz.isEmpty()) {
            max_column_width = qMax(max_column_width, sz.width());
            //wrapping
            if (!scroll &&
               y+sz.height()+vmargin > dh - (deskFw * 2)) {
                ncols++;
                y = vmargin;
            }
            y += sz.height();
            //update the item
            actionRects[i] = QRect(0, 0, sz.width(), sz.height());
        }
    }

    max_column_width += tabWidth; //finally add in the tab width
    const int sfcMargin = style->sizeFromContents(QStyle::CT_Menu, &opt, QApplication::globalStrut(), q).width() - QApplication::globalStrut().width();
    const int min_column_width = q->minimumWidth() - (sfcMargin + leftmargin + rightmargin + 2 * (fw + hmargin));
    max_column_width = qMax(min_column_width, max_column_width);

    //calculate position
    const int base_y = vmargin + fw + topmargin +
        (scroll ? scroll->scrollOffset : 0) +
        tearoffHeight;
    int x = hmargin + fw + leftmargin;
    y = base_y;

    for(int i = 0; i < actions.count(); i++) {
        QRect &rect = actionRects[i];
        if (rect.isNull())
            continue;
        if (!scroll &&
           y+rect.height() > dh - deskFw * 2) {
            x += max_column_width + hmargin;
            y = base_y;
        }
        rect.translate(x, y);                        //move
        rect.setWidth(max_column_width); //uniform width

        //we need to update the widgets geometry
        if (QWidget *widget = widgetItems.value(actions.at(i))) {
            widget->setGeometry(rect);
            widget->setVisible(actions.at(i)->isVisible());
        }

        y += rect.height();
    }
    itemsDirty = 0;
}

QSize QMenuPrivate::adjustMenuSizeForScreen(const QRect &screen)
{
    Q_Q(QMenu);
    QSize ret = screen.size();
    itemsDirty = true;
    updateActionRects(screen);
    const int fw = q->style()->pixelMetric(QStyle::PM_MenuPanelWidth, 0, q);
    ret.setWidth(actionRects.at(getLastVisibleAction()).right() + fw);
    return ret;
}

int QMenuPrivate::getLastVisibleAction() const
{
    //let's try to get the last visible action
    int lastVisibleAction = actions.count() - 1;
    for (;lastVisibleAction >= 0; --lastVisibleAction) {
        const QAction *action = actions.at(lastVisibleAction);
        if (action->isVisible()) {
            //removing trailing separators
            if (action->isSeparator() && collapsibleSeparators)
                continue;
            break;
        }
    }
    return lastVisibleAction;
}


QRect QMenuPrivate::actionRect(QAction *act) const
{
    int index = actions.indexOf(act);
    if (index == -1)
        return QRect();

    updateActionRects();

    //we found the action
    return actionRects.at(index);
}

void QMenuPrivate::hideUpToMenuBar()
{
    Q_Q(QMenu);
    bool fadeMenus = q->style()->styleHint(QStyle::SH_Menu_FadeOutOnHide);
    if (!tornoff) {
        QWidget *caused = causedPopup.widget;
        hideMenu(q); //hide after getting causedPopup
        while(caused) {
#ifndef QT_NO_MENUBAR
            if (QMenuBar *mb = qobject_cast<QMenuBar*>(caused)) {
                mb->d_func()->setCurrentAction(0);
                mb->d_func()->setKeyboardMode(false);
                caused = 0;
            } else
#endif
            if (QMenu *m = qobject_cast<QMenu*>(caused)) {
                caused = m->d_func()->causedPopup.widget;
                if (!m->d_func()->tornoff)
                    hideMenu(m);
                if (!fadeMenus) // Mac doesn't clear the action until after hidden.
                    m->d_func()->setCurrentAction(0);
            } else {                caused = 0;
            }
        }
    }
    setCurrentAction(0);
}

void QMenuPrivate::hideMenu(QMenu *menu)
{
    if (!menu)
        return;
#if !defined(QT_NO_EFFECTS)
    QSignalBlocker blocker(menu);
    aboutToHide = true;
    // Flash item which is about to trigger (if any).
    if (menu->style()->styleHint(QStyle::SH_Menu_FlashTriggeredItem)
        && currentAction && currentAction == actionAboutToTrigger
        && menu->actions().contains(currentAction)) {
        QEventLoop eventLoop;
        QAction *activeAction = currentAction;

        menu->setActiveAction(0);
        QTimer::singleShot(60, &eventLoop, SLOT(quit()));
        eventLoop.exec();

        // Select and wait 20 ms.
        menu->setActiveAction(activeAction);
        QTimer::singleShot(20, &eventLoop, SLOT(quit()));
        eventLoop.exec();
    }

    aboutToHide = false;
    blocker.unblock();
#endif // QT_NO_EFFECTS
    if (activeMenu == menu)
        activeMenu = 0;
    menu->d_func()->causedPopup.action = 0;
    menu->d_func()->causedPopup.widget = 0;
    menu->close();
    if (previousMouseMenu.data() == menu)
        handleEnterLeaveEvents(&previousMouseMenu, Q_NULLPTR);
}

void QMenuPrivate::popupAction(QAction *action, int delay, bool activateFirst)
{
    Q_Q(QMenu);
    if (action) {
        if (action->isEnabled()) {
            if (!delay)
                q->internalDelayedPopup();
            else if (action->menu() && !action->menu()->isVisible())
                delayState.start(delay, action);
            else if (!action->menu())
                delayState.stop();
            if (activateFirst && action->menu())
                action->menu()->d_func()->setFirstActionActive();
        }
    } else if (QMenu *menu = activeMenu) {  //hide the current item
        hideMenu(menu);
    }
}

void QMenuPrivate::setSyncAction()
{
    Q_Q(QMenu);
    QAction *current = currentAction;
    if(current && (!current->isEnabled() || current->menu() || current->isSeparator()))
        current = 0;
    for(QWidget *caused = q; caused;) {
        if (QMenu *m = qobject_cast<QMenu*>(caused)) {
            caused = m->d_func()->causedPopup.widget;
            if (m->d_func()->eventLoop)
                m->d_func()->syncAction = current; // synchronous operation
        } else {
            break;
        }
    }
}


void QMenuPrivate::setFirstActionActive()
{
    Q_Q(QMenu);
    updateActionRects();
    for(int i = 0, saccum = 0; i < actions.count(); i++) {
        const QRect &rect = actionRects.at(i);
        if (rect.isNull())
            continue;
        if (scroll && scroll->scrollFlags & QMenuScroller::ScrollUp) {
            saccum -= rect.height();
            if (saccum > scroll->scrollOffset - scrollerHeight())
                continue;
        }
        QAction *act = actions.at(i);
        if (!act->isSeparator() &&
           (q->style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, q)
            || act->isEnabled())) {
            setCurrentAction(act);
            break;
        }
    }
}

// popup == -1 means do not popup, 0 means immediately, others mean use a timer
void QMenuPrivate::setCurrentAction(QAction *action, int popup, SelectionReason reason, bool activateFirst)
{
    Q_Q(QMenu);
    tearoffHighlighted = 0;

    if (action
            && (action->isSeparator()
                || (!action->isEnabled() && !q->style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, q))))
        action = Q_NULLPTR;

    // Reselect the currently active action in case mouse moved over other menu items when
    // moving from sub menu action to sub menu (QTBUG-20094).
    if (reason != SelectedFromKeyboard) {
        if (QMenu *menu = qobject_cast<QMenu*>(causedPopup.widget)) {
            if (causedPopup.action && menu->d_func()->activeMenu == q)
                menu->d_func()->setCurrentAction(causedPopup.action, 0, reason, false);
        }
    }

    if (currentAction)
        q->update(actionRect(currentAction));

    QMenu *hideActiveMenu = activeMenu;
    QAction *previousAction = currentAction;

    currentAction = action;
    if (action) {
        if (!action->isSeparator()) {
            activateAction(action, QAction::Hover);
            if (popup != -1) {
                // if the menu is visible then activate the required action,
                // otherwise we just mark the action as currentAction
                // and activate it when the menu will be popuped.
                if (q->isVisible())
                    popupAction(currentAction, popup, activateFirst);
            }
            q->update(actionRect(action));

            if (reason == SelectedFromKeyboard) {
                QWidget *widget = widgetItems.value(action);
                if (widget) {
                    if (widget->focusPolicy() != Qt::NoFocus)
                        widget->setFocus(Qt::TabFocusReason);
                } else {
                    //when the action has no QWidget, the QMenu itself should
                    // get the focus
                    // Since the menu is a pop-up, it uses the popup reason.
                    if (!q->hasFocus()) {
                        q->setFocus(Qt::PopupFocusReason);
                    }
                }
            }
        }
#ifndef QT_NO_STATUSTIP
    }  else if (previousAction) {
        previousAction->d_func()->showStatusText(topCausedWidget(), QString());
#endif
    }
    if (hideActiveMenu && previousAction != currentAction) {
        if (popup == -1) {
#ifndef QT_NO_EFFECTS
            // kill any running effect
            qFadeEffect(0);
            qScrollEffect(0);
#endif
            hideMenu(hideActiveMenu);
        } else if (!currentAction || !currentAction->menu()) {
            sloppyState.startTimerIfNotRunning();
        }
    }
}

void QMenuSloppyState::reset()
{
    m_enabled = false;
    m_first_mouse = true;
    m_init_guard = false;
    m_uni_dir_discarded_count = 0;
    m_time.stop();
    m_reset_action = Q_NULLPTR;
    m_origin_action = Q_NULLPTR;
    m_action_rect = QRect();
    m_previous_point = QPointF();
    if (m_sub_menu) {
        QMenuPrivate::get(m_sub_menu)->sloppyState.m_parent = Q_NULLPTR;
        m_sub_menu = Q_NULLPTR;
    }
}
void QMenuSloppyState::enter()
{
    QMenuPrivate *menuPriv = QMenuPrivate::get(m_menu);

    if (m_discard_state_when_entering_parent && m_sub_menu == menuPriv->activeMenu) {
        menuPriv->hideMenu(m_sub_menu);
        reset();
    }
    if (m_parent)
        m_parent->childEnter();
}

void QMenuSloppyState::childLeave()
{
    if (m_enabled && !QMenuPrivate::get(m_menu)->hasReceievedEnter) {
        startTimer();
        if (m_parent)
            m_parent->childLeave();
    }
}

void QMenuSloppyState::setSubMenuPopup(const QRect &actionRect, QAction *resetAction, QMenu *subMenu)
{
    m_enabled = true;
    m_init_guard = true;
    m_time.stop();
    m_action_rect = actionRect;
    m_sub_menu = subMenu;
    QMenuPrivate::get(subMenu)->sloppyState.m_parent = this;
    m_reset_action = resetAction;
    m_origin_action = resetAction;
}

bool QMenuSloppyState::hasParentActiveDelayTimer() const
{
    return m_parent && m_parent->m_menu && QMenuPrivate::get(m_parent->m_menu)->delayState.timer.isActive();
}

class ResetOnDestroy
{
public:
    ResetOnDestroy(QMenuSloppyState *sloppyState, bool *guard)
        : toReset(sloppyState)
        , guard(guard)
    {
        *guard = false;
    }

    ~ResetOnDestroy()
    {
        if (!*guard)
            toReset->reset();
    }

    QMenuSloppyState *toReset;
    bool *guard;
};

void QMenuSloppyState::timeout()
{
    QMenuPrivate *menu_priv = QMenuPrivate::get(m_menu);
    if (menu_priv->currentAction == m_reset_action
            && menu_priv->hasReceievedEnter
            && (menu_priv->currentAction
                && menu_priv->currentAction->menu() == menu_priv->activeMenu)) {
        return;
    }

    ResetOnDestroy resetState(this, &m_init_guard);

    if (hasParentActiveDelayTimer() || !m_menu || !m_menu->isVisible())
        return;

    if (m_sub_menu)
        menu_priv->hideMenu(m_sub_menu);

    if (menu_priv->hasReceievedEnter)
        menu_priv->setCurrentAction(m_reset_action,0);
    else
        menu_priv->setCurrentAction(Q_NULLPTR, 0);
}

//return the top causedPopup.widget that is not a QMenu
QWidget *QMenuPrivate::topCausedWidget() const
{
    QWidget* top = causedPopup.widget;
    while (QMenu* m = qobject_cast<QMenu *>(top))
        top = m->d_func()->causedPopup.widget;
    return top;
}

QAction *QMenuPrivate::actionAt(QPoint p) const
{
    if (!q_func()->rect().contains(p))     //sanity check
       return 0;

    for(int i = 0; i < actionRects.count(); i++) {
        if (actionRects.at(i).contains(p))
            return actions.at(i);
    }
    return 0;
}

void QMenuPrivate::setOverrideMenuAction(QAction *a)
{
    Q_Q(QMenu);
    QObject::disconnect(menuAction, SIGNAL(destroyed()), q, SLOT(_q_overrideMenuActionDestroyed()));
    if (a) {
        menuAction = a;
        QObject::connect(a, SIGNAL(destroyed()), q, SLOT(_q_overrideMenuActionDestroyed()));
    } else { //we revert back to the default action created by the QMenu itself
        menuAction = defaultMenuAction;
    }
}

void QMenuPrivate::_q_overrideMenuActionDestroyed()
{
    menuAction=defaultMenuAction;
}


void QMenuPrivate::updateLayoutDirection()
{
    Q_Q(QMenu);
    //we need to mimic the cause of the popup's layout direction
    //to allow setting it on a mainwindow for example
    //we call setLayoutDirection_helper to not overwrite a user-defined value
    if (!q->testAttribute(Qt::WA_SetLayoutDirection)) {
        if (QWidget *w = causedPopup.widget)
            setLayoutDirection_helper(w->layoutDirection());
        else if (QWidget *w = q->parentWidget())
            setLayoutDirection_helper(w->layoutDirection());
        else
            setLayoutDirection_helper(QApplication::layoutDirection());
    }
}


/*!
    Returns the action associated with this menu.
*/
QAction *QMenu::menuAction() const
{
    return d_func()->menuAction;
}

/*!
  \property QMenu::title
  \brief The title of the menu

  This is equivalent to the QAction::text property of the menuAction().

  By default, this property contains an empty string.
*/
QString QMenu::title() const
{
    return d_func()->menuAction->text();
}

void QMenu::setTitle(const QString &text)
{
    d_func()->menuAction->setText(text);
}

/*!
  \property QMenu::icon

  \brief The icon of the menu

  This is equivalent to the QAction::icon property of the menuAction().

  By default, if no icon is explicitly set, this property contains a null icon.
*/
QIcon QMenu::icon() const
{
    return d_func()->menuAction->icon();
}

void QMenu::setIcon(const QIcon &icon)
{
    d_func()->menuAction->setIcon(icon);
}


//actually performs the scrolling
void QMenuPrivate::scrollMenu(QAction *action, QMenuScroller::ScrollLocation location, bool active)
{
    Q_Q(QMenu);
    if (!scroll || !scroll->scrollFlags)
        return;
    updateActionRects();
    int newOffset = 0;
    const int topScroll = (scroll->scrollFlags & QMenuScroller::ScrollUp)   ? scrollerHeight() : 0;
    const int botScroll = (scroll->scrollFlags & QMenuScroller::ScrollDown) ? scrollerHeight() : 0;
    const int vmargin = q->style()->pixelMetric(QStyle::PM_MenuVMargin, 0, q);
    const int fw = q->style()->pixelMetric(QStyle::PM_MenuPanelWidth, 0, q);

    if (location == QMenuScroller::ScrollTop) {
        for(int i = 0, saccum = 0; i < actions.count(); i++) {
            if (actions.at(i) == action) {
                newOffset = topScroll - saccum;
                break;
            }
            saccum += actionRects.at(i).height();
        }
    } else {
        for(int i = 0, saccum = 0; i < actions.count(); i++) {
            saccum += actionRects.at(i).height();
            if (actions.at(i) == action) {
                if (location == QMenuScroller::ScrollCenter)
                    newOffset = ((q->height() / 2) - botScroll) - (saccum - topScroll);
                else
                    newOffset = (q->height() - botScroll) - saccum;
                break;
            }
        }
        if(newOffset)
            newOffset -= fw * 2;
    }

    //figure out which scroll flags
    uint newScrollFlags = QMenuScroller::ScrollNone;
    if (newOffset < 0) //easy and cheap one
        newScrollFlags |= QMenuScroller::ScrollUp;
    int saccum = newOffset;
    for(int i = 0; i < actionRects.count(); i++) {
        saccum += actionRects.at(i).height();
        if (saccum > q->height()) {
            newScrollFlags |= QMenuScroller::ScrollDown;
            break;
        }
    }

    if (!(newScrollFlags & QMenuScroller::ScrollDown) && (scroll->scrollFlags & QMenuScroller::ScrollDown)) {
        newOffset = q->height() - (saccum - newOffset) - fw*2 - vmargin;    //last item at bottom
    }

    if (!(newScrollFlags & QMenuScroller::ScrollUp) && (scroll->scrollFlags & QMenuScroller::ScrollUp)) {
        newOffset = 0;  //first item at top
    }

    if (newScrollFlags & QMenuScroller::ScrollUp)
        newOffset -= vmargin;

    QRect screen = popupGeometry(q);
    const int desktopFrame = q->style()->pixelMetric(QStyle::PM_MenuDesktopFrameWidth, 0, q);
    if (q->height() < screen.height()-(desktopFrame*2)-1) {
        QRect geom = q->geometry();
        if (newOffset > scroll->scrollOffset && (scroll->scrollFlags & newScrollFlags & QMenuScroller::ScrollUp)) { //scroll up
            const int newHeight = geom.height()-(newOffset-scroll->scrollOffset);
            if(newHeight > geom.height())
                geom.setHeight(newHeight);
        } else if(scroll->scrollFlags & newScrollFlags & QMenuScroller::ScrollDown) {
            int newTop = geom.top() + (newOffset-scroll->scrollOffset);
            if (newTop < desktopFrame+screen.top())
                newTop = desktopFrame+screen.top();
            if (newTop < geom.top()) {
                geom.setTop(newTop);
                newOffset = 0;
                newScrollFlags &= ~QMenuScroller::ScrollUp;
            }
        }
        if (geom.bottom() > screen.bottom() - desktopFrame)
            geom.setBottom(screen.bottom() - desktopFrame);
        if (geom.top() < desktopFrame+screen.top())
            geom.setTop(desktopFrame+screen.top());
        if (geom != q->geometry()) {
#if 0
            if (newScrollFlags & QMenuScroller::ScrollDown &&
               q->geometry().top() - geom.top() >= -newOffset)
                newScrollFlags &= ~QMenuScroller::ScrollDown;
#endif
            q->setGeometry(geom);
        }
    }

    //actually update flags
    const int delta = qMin(0, newOffset) - scroll->scrollOffset; //make sure the new offset is always negative
    if (!itemsDirty && delta) {
        //we've scrolled so we need to update the action rects
        for (int i = 0; i < actionRects.count(); ++i) {
            QRect &current = actionRects[i];
            current.moveTop(current.top() + delta);

            //we need to update the widgets geometry
            if (QWidget *w = widgetItems.value(actions.at(i)))
                w->setGeometry(current);
        }
    }
    scroll->scrollOffset += delta;
    scroll->scrollFlags = newScrollFlags;
    if (active)
        setCurrentAction(action);

    q->update();     //issue an update so we see all the new state..
}

void QMenuPrivate::scrollMenu(QMenuScroller::ScrollLocation location, bool active)
{
    Q_Q(QMenu);
    updateActionRects();
    if(location == QMenuScroller::ScrollBottom) {
        for(int i = actions.size()-1; i >= 0; --i) {
            QAction *act = actions.at(i);
            if (actionRects.at(i).isNull())
                continue;
            if (!act->isSeparator() &&
                (q->style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, q)
                 || act->isEnabled())) {
                if(scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollDown)
                    scrollMenu(act, QMenuPrivate::QMenuScroller::ScrollBottom, active);
                else if(active)
                    setCurrentAction(act, /*popup*/-1, QMenuPrivate::SelectedFromKeyboard);
                break;
            }
        }
    } else if(location == QMenuScroller::ScrollTop) {
        for(int i = 0; i < actions.size(); ++i) {
            QAction *act = actions.at(i);
            if (actionRects.at(i).isNull())
                continue;
            if (!act->isSeparator() &&
                (q->style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, q)
                 || act->isEnabled())) {
                if(scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollUp)
                    scrollMenu(act, QMenuPrivate::QMenuScroller::ScrollTop, active);
                else if(active)
                    setCurrentAction(act, /*popup*/-1, QMenuPrivate::SelectedFromKeyboard);
                break;
            }
        }
    }
}

//only directional
void QMenuPrivate::scrollMenu(QMenuScroller::ScrollDirection direction, bool page, bool active)
{
    Q_Q(QMenu);
    if (!scroll || !(scroll->scrollFlags & direction)) //not really possible...
        return;
    updateActionRects();
    const int topScroll = (scroll->scrollFlags & QMenuScroller::ScrollUp)   ? scrollerHeight() : 0;
    const int botScroll = (scroll->scrollFlags & QMenuScroller::ScrollDown) ? scrollerHeight() : 0;
    const int vmargin = q->style()->pixelMetric(QStyle::PM_MenuVMargin, 0, q);
    const int fw = q->style()->pixelMetric(QStyle::PM_MenuPanelWidth, 0, q);
    const int offset = topScroll ? topScroll-vmargin : 0;
    if (direction == QMenuScroller::ScrollUp) {
        for(int i = 0, saccum = 0; i < actions.count(); i++) {
            saccum -= actionRects.at(i).height();
            if (saccum <= scroll->scrollOffset-offset) {
                scrollMenu(actions.at(i), page ? QMenuScroller::ScrollBottom : QMenuScroller::ScrollTop, active);
                break;
            }
        }
    } else if (direction == QMenuScroller::ScrollDown) {
        bool scrolled = false;
        for(int i = 0, saccum = 0; i < actions.count(); i++) {
            const int iHeight = actionRects.at(i).height();
            saccum -= iHeight;
            if (saccum <= scroll->scrollOffset-offset) {
                const int scrollerArea = q->height() - botScroll - fw*2;
                int visible = (scroll->scrollOffset-offset) - saccum;
                for(i++ ; i < actions.count(); i++) {
                    visible += actionRects.at(i).height();
                    if (visible > scrollerArea - topScroll) {
                        scrolled = true;
                        scrollMenu(actions.at(i), page ? QMenuScroller::ScrollTop : QMenuScroller::ScrollBottom, active);
                        break;
                    }
                }
                break;
            }
        }
        if(!scrolled) {
            scroll->scrollFlags &= ~QMenuScroller::ScrollDown;
            q->update();
        }
    }
}

/* This is poor-mans eventfilters. This avoids the use of
   eventFilter (which can be nasty for users of QMenuBar's). */
bool QMenuPrivate::mouseEventTaken(QMouseEvent *e)
{
    Q_Q(QMenu);
    QPoint pos = q->mapFromGlobal(e->globalPos());
    if (scroll && !activeMenu) { //let the scroller "steal" the event
        bool isScroll = false;
        if (pos.x() >= 0 && pos.x() < q->width()) {
            for(int dir = QMenuScroller::ScrollUp; dir <= QMenuScroller::ScrollDown; dir = dir << 1) {
                if (scroll->scrollFlags & dir) {
                    if (dir == QMenuScroller::ScrollUp)
                        isScroll = (pos.y() <= scrollerHeight());
                    else if (dir == QMenuScroller::ScrollDown)
                        isScroll = (pos.y() >= q->height() - scrollerHeight());
                    if (isScroll) {
                        scroll->scrollDirection = dir;
                        break;
                    }
                }
            }
        }
        if (isScroll) {
            scroll->scrollTimer.start(50, q);
            return true;
        } else {
            scroll->scrollTimer.stop();
        }
    }

    if (tearoff) { //let the tear off thingie "steal" the event..
        QRect tearRect(0, 0, q->width(), q->style()->pixelMetric(QStyle::PM_MenuTearoffHeight, 0, q));
        if (scroll && scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollUp)
            tearRect.translate(0, scrollerHeight());
        q->update(tearRect);
        if (tearRect.contains(pos) && hasMouseMoved(e->globalPos())) {
            setCurrentAction(0);
            tearoffHighlighted = 1;
            if (e->type() == QEvent::MouseButtonRelease) {
                if (!tornPopup)
                    tornPopup = new QTornOffMenu(q);
                tornPopup->setGeometry(q->geometry());
                tornPopup->show();
                hideUpToMenuBar();
            }
            return true;
        }
        tearoffHighlighted = 0;
    }

    if (q->frameGeometry().contains(e->globalPos())) { //otherwise if the event is in our rect we want it..
        handleEnterLeaveEvents(&previousMouseMenu, q);
        return false;
    }

    for(QWidget *caused = causedPopup.widget; caused;) {
        bool passOnEvent = false;
        QWidget *next_widget = 0;
        QPoint cpos = caused->mapFromGlobal(e->globalPos());
#ifndef QT_NO_MENUBAR
        if (QMenuBar *mb = qobject_cast<QMenuBar*>(caused)) {
            passOnEvent = mb->rect().contains(cpos);
        } else
#endif
        if (QMenu *m = qobject_cast<QMenu*>(caused)) {
            passOnEvent = m->rect().contains(cpos);
            next_widget = m->d_func()->causedPopup.widget;
        }
        if (passOnEvent) {
            handleEnterLeaveEvents(&previousMouseMenu,qobject_cast<QMenu *>(caused));
            if(e->type() != QEvent::MouseButtonRelease || mouseDown == caused) {
            QMouseEvent new_e(e->type(), cpos, caused->mapTo(caused->topLevelWidget(), cpos), e->screenPos(),
                              e->button(), e->buttons(), e->modifiers());
            QGuiApplicationPrivate::setMouseEventSource(&new_e, e->source());
            QApplication::sendEvent(caused, &new_e);
            return true;
            }
        }
        caused = next_widget;
        if (!caused)
            handleEnterLeaveEvents(&previousMouseMenu, Q_NULLPTR);
    }
    return false;
}

void QMenuPrivate::activateCausedStack(const QList<QPointer<QWidget> > &causedStack, QAction *action, QAction::ActionEvent action_e, bool self)
{
    QBoolBlocker guard(activationRecursionGuard);
    if(self)
        action->activate(action_e);

    for(int i = 0; i < causedStack.size(); ++i) {
        QPointer<QWidget> widget = causedStack.at(i);
        if (!widget)
            continue;
        //fire
        if (QMenu *qmenu = qobject_cast<QMenu*>(widget)) {
            widget = qmenu->d_func()->causedPopup.widget;
            if (action_e == QAction::Trigger) {
                emit qmenu->triggered(action);
           } else if (action_e == QAction::Hover) {
                emit qmenu->hovered(action);
            }
#ifndef QT_NO_MENUBAR
        } else if (QMenuBar *qmenubar = qobject_cast<QMenuBar*>(widget)) {
            if (action_e == QAction::Trigger) {
                emit qmenubar->triggered(action);
            } else if (action_e == QAction::Hover) {
                emit qmenubar->hovered(action);
            }
            break; //nothing more..
#endif
        }
    }
}

void QMenuPrivate::activateAction(QAction *action, QAction::ActionEvent action_e, bool self)
{
    Q_Q(QMenu);
#ifndef QT_NO_WHATSTHIS
    bool inWhatsThisMode = QWhatsThis::inWhatsThisMode();
#endif
    if (!action || !q->isEnabled()
        || (action_e == QAction::Trigger
#ifndef QT_NO_WHATSTHIS
            && !inWhatsThisMode
#endif
            && (action->isSeparator() ||!action->isEnabled())))
        return;

    /* I have to save the caused stack here because it will be undone after popup execution (ie in the hide).
       Then I iterate over the list to actually send the events. --Sam
    */
    const QList<QPointer<QWidget> > causedStack = calcCausedStack();
    if (action_e == QAction::Trigger) {
#ifndef QT_NO_WHATSTHIS
        if (!inWhatsThisMode)
            actionAboutToTrigger = action;
#endif

        if (q->testAttribute(Qt::WA_DontShowOnScreen)) {
            hideUpToMenuBar();
        } else {
            for(QWidget *widget = QApplication::activePopupWidget(); widget; ) {
                if (QMenu *qmenu = qobject_cast<QMenu*>(widget)) {
                    if(qmenu == q)
                        hideUpToMenuBar();
                    widget = qmenu->d_func()->causedPopup.widget;
                } else {
                    break;
                }
            }
        }

#ifndef QT_NO_WHATSTHIS
        if (inWhatsThisMode) {
            QString s = action->whatsThis();
            if (s.isEmpty())
                s = whatsThis;
            QWhatsThis::showText(q->mapToGlobal(actionRect(action).center()), s, q);
            return;
        }
#endif
    }


    activateCausedStack(causedStack, action, action_e, self);


    if (action_e == QAction::Hover) {
#ifndef QT_NO_ACCESSIBILITY
        if (QAccessible::isActive()) {
            int actionIndex = indexOf(action);
            QAccessibleEvent focusEvent(q, QAccessible::Focus);
            focusEvent.setChild(actionIndex);
            QAccessible::updateAccessibility(&focusEvent);
        }
#endif
        action->showStatusText(topCausedWidget());
    } else {
        actionAboutToTrigger = 0;
    }
}

void QMenuPrivate::_q_actionTriggered()
{
    Q_Q(QMenu);
    if (QAction *action = qobject_cast<QAction *>(q->sender())) {
        QPointer<QAction> actionGuard = action;
        if (platformMenu && widgetItems.value(action))
            platformMenu->dismiss();
        emit q->triggered(action);
        if (!activationRecursionGuard && actionGuard) {
            //in case the action has not been activated by the mouse
            //we check the parent hierarchy
            QList< QPointer<QWidget> > list;
            for(QWidget *widget = q->parentWidget(); widget; ) {
                if (qobject_cast<QMenu*>(widget)
#ifndef QT_NO_MENUBAR
                    || qobject_cast<QMenuBar*>(widget)
#endif
                    ) {
                    list.append(widget);
                    widget = widget->parentWidget();
                } else {
                    break;
                }
            }
            activateCausedStack(list, action, QAction::Trigger, false);
        }
    }
}

void QMenuPrivate::_q_actionHovered()
{
    Q_Q(QMenu);
    if (QAction * action = qobject_cast<QAction *>(q->sender())) {
        emit q->hovered(action);
    }
}

void QMenuPrivate::_q_platformMenuAboutToShow()
{
    Q_Q(QMenu);

#ifdef Q_OS_OSX
    if (platformMenu)
        Q_FOREACH (QAction *action, q->actions())
            if (QWidget *widget = widgetItems.value(const_cast<QAction *>(action)))
                if (widget->parent() == q) {
                    QPlatformMenuItem *menuItem = platformMenu->menuItemForTag(reinterpret_cast<quintptr>(action));
                    moveWidgetToPlatformItem(widget, menuItem);
                    platformMenu->syncMenuItem(menuItem);
                }
#endif

    emit q->aboutToShow();
}

bool QMenuPrivate::hasMouseMoved(const QPoint &globalPos)
{
    //determines if the mouse has moved (ie its initial position has
    //changed by more than QApplication::startDragDistance()
    //or if there were at least 6 mouse motions)
    return motions > 6 ||
        QApplication::startDragDistance() < (mousePopupPos - globalPos).manhattanLength();
}


/*!
    Initialize \a option with the values from this menu and information from \a action. This method
    is useful for subclasses when they need a QStyleOptionMenuItem, but don't want
    to fill in all the information themselves.

    \sa QStyleOption::initFrom(), QMenuBar::initStyleOption()
*/
void QMenu::initStyleOption(QStyleOptionMenuItem *option, const QAction *action) const
{
    if (!option || !action)
        return;

    Q_D(const QMenu);
    option->initFrom(this);
    option->palette = palette();
    option->state = QStyle::State_None;

    if (window()->isActiveWindow())
        option->state |= QStyle::State_Active;
    if (isEnabled() && action->isEnabled()
            && (!action->menu() || action->menu()->isEnabled()))
        option->state |= QStyle::State_Enabled;
    else
        option->palette.setCurrentColorGroup(QPalette::Disabled);

    option->font = action->font().resolve(font());
    option->fontMetrics = QFontMetrics(option->font);

    if (d->currentAction && d->currentAction == action && !d->currentAction->isSeparator()) {
        option->state |= QStyle::State_Selected
                     | (d->mouseDown ? QStyle::State_Sunken : QStyle::State_None);
    }

    option->menuHasCheckableItems = d->hasCheckableItems;
    if (!action->isCheckable()) {
        option->checkType = QStyleOptionMenuItem::NotCheckable;
    } else {
        option->checkType = (action->actionGroup() && action->actionGroup()->isExclusive())
                            ? QStyleOptionMenuItem::Exclusive : QStyleOptionMenuItem::NonExclusive;
        option->checked = action->isChecked();
    }
    if (action->menu())
        option->menuItemType = QStyleOptionMenuItem::SubMenu;
    else if (action->isSeparator())
        option->menuItemType = QStyleOptionMenuItem::Separator;
    else if (d->defaultAction == action)
        option->menuItemType = QStyleOptionMenuItem::DefaultItem;
    else
        option->menuItemType = QStyleOptionMenuItem::Normal;
    if (action->isIconVisibleInMenu())
        option->icon = action->icon();
    QString textAndAccel = action->text();
#ifndef QT_NO_SHORTCUT
    if (textAndAccel.indexOf(QLatin1Char('\t')) == -1) {
        QKeySequence seq = action->shortcut();
        if (!seq.isEmpty())
            textAndAccel += QLatin1Char('\t') + seq.toString(QKeySequence::NativeText);
    }
#endif
    option->text = textAndAccel;
    option->tabWidth = d->tabWidth;
    option->maxIconWidth = d->maxIconWidth;
    option->menuRect = rect();
}

/*!
    \class QMenu
    \brief The QMenu class provides a menu widget for use in menu
    bars, context menus, and other popup menus.

    \ingroup mainwindow-classes
    \ingroup basicwidgets
    \inmodule QtWidgets

    A menu widget is a selection menu. It can be either a pull-down
    menu in a menu bar or a standalone context menu. Pull-down menus
    are shown by the menu bar when the user clicks on the respective
    item or presses the specified shortcut key. Use
    QMenuBar::addMenu() to insert a menu into a menu bar. Context
    menus are usually invoked by some special keyboard key or by
    right-clicking. They can be executed either asynchronously with
    popup() or synchronously with exec(). Menus can also be invoked in
    response to button presses; these are just like context menus
    except for how they are invoked.

    \table 100%
    \row
    \li \inlineimage fusion-menu.png
    \li \inlineimage windowsxp-menu.png
    \li \inlineimage macintosh-menu.png
    \endtable
    \caption Fig. A menu shown in \l{Fusion Style Widget Gallery}{Fusion widget style},
           \l{Windows XP Style Widget Gallery}{Windows XP widget style},
           and \l{Macintosh Style Widget Gallery}{Macintosh widget style}.

    \section1 Actions

    A menu consists of a list of action items. Actions are added with
    the addAction(), addActions() and insertAction() functions. An action
    is represented vertically and rendered by QStyle. In addition, actions
    can have a text label, an optional icon drawn on the very left side,
    and shortcut key sequence such as "Ctrl+X".

    The existing actions held by a menu can be found with actions().

    There are four kinds of action items: separators, actions that
    show a submenu, widgets, and actions that perform an action.
    Separators are inserted with addSeparator(), submenus with addMenu(),
    and all other items are considered action items.

    When inserting action items you usually specify a receiver and a
    slot. The receiver will be notifed whenever the item is
    \l{QAction::triggered()}{triggered()}. In addition, QMenu provides
    two signals, activated() and highlighted(), which signal the
    QAction that was triggered from the menu.

    You clear a menu with clear() and remove individual action items
    with removeAction().

    A QMenu can also provide a tear-off menu. A tear-off menu is a
    top-level window that contains a copy of the menu. This makes it
    possible for the user to "tear off" frequently used menus and
    position them in a convenient place on the screen. If you want
    this functionality for a particular menu, insert a tear-off handle
    with setTearOffEnabled(). When using tear-off menus, bear in mind
    that the concept isn't typically used on Microsoft Windows so
    some users may not be familiar with it. Consider using a QToolBar
    instead.

    Widgets can be inserted into menus with the QWidgetAction class.
    Instances of this class are used to hold widgets, and are inserted
    into menus with the addAction() overload that takes a QAction.

    Conversely, actions can be added to widgets with the addAction(),
    addActions() and insertAction() functions.

    \warning To make QMenu visible on the screen, exec() or popup() should be
    used instead of show().

    \section1 QMenu on Qt for Windows CE

    If a menu is integrated into the native menubar on Windows Mobile we
    do not support the signals: aboutToHide (), aboutToShow () and hovered ().
    It is not possible to display an icon in a native menu on Windows Mobile.

    \section1 QMenu on Mac OS X with Qt Build Against Cocoa

    QMenu can be inserted only once in a menu/menubar. Subsequent insertions will
    have no effect or will result in a disabled menu item.

    See the \l{mainwindows/menus}{Menus} example for an example of how
    to use QMenuBar and QMenu in your application.

    \b{Important inherited functions:} addAction(), removeAction(), clear(),
    addSeparator(), and addMenu().

    \sa QMenuBar, {fowler}{GUI Design Handbook: Menu, Drop-Down and Pop-Up},
        {Application Example}, {Menus Example}, {Recent Files Example}
*/


/*!
    Constructs a menu with parent \a parent.

    Although a popup menu is always a top-level widget, if a parent is
    passed the popup menu will be deleted when that parent is
    destroyed (as with any other QObject).
*/
QMenu::QMenu(QWidget *parent)
    : QWidget(*new QMenuPrivate, parent, Qt::Popup)
{
    Q_D(QMenu);
    d->init();
}

/*!
    Constructs a menu with a \a title and a \a parent.

    Although a popup menu is always a top-level widget, if a parent is
    passed the popup menu will be deleted when that parent is
    destroyed (as with any other QObject).

    \sa title
*/
QMenu::QMenu(const QString &title, QWidget *parent)
    : QWidget(*new QMenuPrivate, parent, Qt::Popup)
{
    Q_D(QMenu);
    d->init();
    d->menuAction->setText(title);
}

/*! \internal
 */
QMenu::QMenu(QMenuPrivate &dd, QWidget *parent)
    : QWidget(dd, parent, Qt::Popup)
{
    Q_D(QMenu);
    d->init();
}

/*!
    Destroys the menu.
*/
QMenu::~QMenu()
{
    Q_D(QMenu);
    if (!d->widgetItems.isEmpty()) {  // avoid detach on shared null hash
        QHash<QAction *, QWidget *>::iterator it = d->widgetItems.begin();
        for (; it != d->widgetItems.end(); ++it) {
            if (QWidget *widget = it.value()) {
                QWidgetAction *action = static_cast<QWidgetAction *>(it.key());
                action->releaseWidget(widget);
                *it = 0;
            }
        }
    }

    if (d->eventLoop)
        d->eventLoop->exit();
    hideTearOffMenu();
}

/*!
    \overload

    This convenience function creates a new action with \a text.
    The function adds the newly created action to the menu's
    list of actions, and returns it.

    QMenu takes ownership of the returned QAction.

    \sa QWidget::addAction()
*/
QAction *QMenu::addAction(const QString &text)
{
    QAction *ret = new QAction(text, this);
    addAction(ret);
    return ret;
}

/*!
    \overload

    This convenience function creates a new action with an \a icon
    and some \a text. The function adds the newly created action to
    the menu's list of actions, and returns it.

    QMenu takes ownership of the returned QAction.

    \sa QWidget::addAction()
*/
QAction *QMenu::addAction(const QIcon &icon, const QString &text)
{
    QAction *ret = new QAction(icon, text, this);
    addAction(ret);
    return ret;
}

/*!
    \overload

    This convenience function creates a new action with the text \a
    text and an optional shortcut \a shortcut. The action's
    \l{QAction::triggered()}{triggered()} signal is connected to the
    \a receiver's \a member slot. The function adds the newly created
    action to the menu's list of actions and returns it.

    QMenu takes ownership of the returned QAction.

    \sa QWidget::addAction()
*/
QAction *QMenu::addAction(const QString &text, const QObject *receiver, const char* member, const QKeySequence &shortcut)
{
    QAction *action = new QAction(text, this);
#ifdef QT_NO_SHORTCUT
    Q_UNUSED(shortcut);
#else
    action->setShortcut(shortcut);
#endif
    QObject::connect(action, SIGNAL(triggered(bool)), receiver, member);
    addAction(action);
    return action;
}

/*!
    \overload

    This convenience function creates a new action with an \a icon and
    some \a text and an optional shortcut \a shortcut. The action's
    \l{QAction::triggered()}{triggered()} signal is connected to the
    \a member slot of the \a receiver object. The function adds the
    newly created action to the menu's list of actions, and returns it.

    QMenu takes ownership of the returned QAction.

    \sa QWidget::addAction()
*/
QAction *QMenu::addAction(const QIcon &icon, const QString &text, const QObject *receiver,
                          const char* member, const QKeySequence &shortcut)
{
    QAction *action = new QAction(icon, text, this);
#ifdef QT_NO_SHORTCUT
    Q_UNUSED(shortcut);
#else
    action->setShortcut(shortcut);
#endif
    QObject::connect(action, SIGNAL(triggered(bool)), receiver, member);
    addAction(action);
    return action;
}

/*!
    This convenience function adds \a menu as a submenu to this menu.
    It returns \a menu's menuAction(). This menu does not take
    ownership of \a menu.

    \sa QWidget::addAction(), QMenu::menuAction()
*/
QAction *QMenu::addMenu(QMenu *menu)
{
    QAction *action = menu->menuAction();
    addAction(action);
    return action;
}

/*!
  Appends a new QMenu with \a title to the menu. The menu
  takes ownership of the menu. Returns the new menu.

  \sa QWidget::addAction(), QMenu::menuAction()
*/
QMenu *QMenu::addMenu(const QString &title)
{
    QMenu *menu = new QMenu(title, this);
    addAction(menu->menuAction());
    return menu;
}

/*!
  Appends a new QMenu with \a icon and \a title to the menu. The menu
  takes ownership of the menu. Returns the new menu.

  \sa QWidget::addAction(), QMenu::menuAction()
*/
QMenu *QMenu::addMenu(const QIcon &icon, const QString &title)
{
    QMenu *menu = new QMenu(title, this);
    menu->setIcon(icon);
    addAction(menu->menuAction());
    return menu;
}

/*!
    This convenience function creates a new separator action, i.e. an
    action with QAction::isSeparator() returning true, and adds the new
    action to this menu's list of actions. It returns the newly
    created action.

    QMenu takes ownership of the returned QAction.

    \sa QWidget::addAction()
*/
QAction *QMenu::addSeparator()
{
    QAction *action = new QAction(this);
    action->setSeparator(true);
    addAction(action);
    return action;
}

/*!
    \since 5.1

    This convenience function creates a new section action, i.e. an
    action with QAction::isSeparator() returning true but also
    having \a text hint, and adds the new action to this menu's list
    of actions. It returns the newly created action.

    The rendering of the hint is style and platform dependent. Widget
    styles can use the text information in the rendering for sections,
    or can choose to ignore it and render sections like simple separators.

    QMenu takes ownership of the returned QAction.

    \sa QWidget::addAction()
*/
QAction *QMenu::addSection(const QString &text)
{
    QAction *action = new QAction(text, this);
    action->setSeparator(true);
    addAction(action);
    return action;
}

/*!
    \since 5.1

    This convenience function creates a new section action, i.e. an
    action with QAction::isSeparator() returning true but also
    having \a text and \a icon hints, and adds the new action to this menu's
    list of actions. It returns the newly created action.

    The rendering of the hints is style and platform dependent. Widget
    styles can use the text and icon information in the rendering for sections,
    or can choose to ignore them and render sections like simple separators.

    QMenu takes ownership of the returned QAction.

    \sa QWidget::addAction()
*/
QAction *QMenu::addSection(const QIcon &icon, const QString &text)
{
    QAction *action = new QAction(icon, text, this);
    action->setSeparator(true);
    addAction(action);
    return action;
}

/*!
    This convenience function inserts \a menu before action \a before
    and returns the menus menuAction().

    \sa QWidget::insertAction(), addMenu()
*/
QAction *QMenu::insertMenu(QAction *before, QMenu *menu)
{
    QAction *action = menu->menuAction();
    insertAction(before, action);
    return action;
}

/*!
    This convenience function creates a new separator action, i.e. an
    action with QAction::isSeparator() returning true. The function inserts
    the newly created action into this menu's list of actions before
    action \a before and returns it.

    QMenu takes ownership of the returned QAction.

    \sa QWidget::insertAction(), addSeparator()
*/
QAction *QMenu::insertSeparator(QAction *before)
{
    QAction *action = new QAction(this);
    action->setSeparator(true);
    insertAction(before, action);
    return action;
}

/*!
    \since 5.1

    This convenience function creates a new title action, i.e. an
    action with QAction::isSeparator() returning true but also having
    \a text hint. The function inserts the newly created action
    into this menu's list of actions before action \a before and
    returns it.

    The rendering of the hint is style and platform dependent. Widget
    styles can use the text information in the rendering for sections,
    or can choose to ignore it and render sections like simple separators.

    QMenu takes ownership of the returned QAction.

    \sa QWidget::insertAction(), addSection()
*/
QAction *QMenu::insertSection(QAction *before, const QString &text)
{
    QAction *action = new QAction(text, this);
    action->setSeparator(true);
    insertAction(before, action);
    return action;
}

/*!
    \since 5.1

    This convenience function creates a new title action, i.e. an
    action with QAction::isSeparator() returning true but also having
    \a text and \a icon hints. The function inserts the newly created action
    into this menu's list of actions before action \a before and returns it.

    The rendering of the hints is style and platform dependent. Widget
    styles can use the text and icon information in the rendering for sections,
    or can choose to ignore them and render sections like simple separators.

    QMenu takes ownership of the returned QAction.

    \sa QWidget::insertAction(), addSection()
*/
QAction *QMenu::insertSection(QAction *before, const QIcon &icon, const QString &text)
{
    QAction *action = new QAction(icon, text, this);
    action->setSeparator(true);
    insertAction(before, action);
    return action;
}

/*!
  This sets the default action to \a act. The default action may have
  a visual cue, depending on the current QStyle. A default action
  usually indicates what will happen by default when a drop occurs.

  \sa defaultAction()
*/
void QMenu::setDefaultAction(QAction *act)
{
    d_func()->defaultAction = act;
}

/*!
  Returns the current default action.

  \sa setDefaultAction()
*/
QAction *QMenu::defaultAction() const
{
    return d_func()->defaultAction;
}

/*!
    \property QMenu::tearOffEnabled
    \brief whether the menu supports being torn off

    When true, the menu contains a special tear-off item (often shown as a dashed
    line at the top of the menu) that creates a copy of the menu when it is
    triggered.

    This "torn-off" copy lives in a separate window. It contains the same menu
    items as the original menu, with the exception of the tear-off handle.

    By default, this property is \c false.
*/
void QMenu::setTearOffEnabled(bool b)
{
    Q_D(QMenu);
    if (d->tearoff == b)
        return;
    if (!b)
        hideTearOffMenu();
    d->tearoff = b;

    d->itemsDirty = true;
    if (isVisible())
        resize(sizeHint());
}

bool QMenu::isTearOffEnabled() const
{
    return d_func()->tearoff;
}

/*!
  When a menu is torn off a second menu is shown to display the menu
  contents in a new window. When the menu is in this mode and the menu
  is visible returns \c true; otherwise false.

  \sa hideTearOffMenu(), isTearOffEnabled()
*/
bool QMenu::isTearOffMenuVisible() const
{
    if (d_func()->tornPopup)
        return d_func()->tornPopup->isVisible();
    return false;
}

/*!
   This function will forcibly hide the torn off menu making it
   disappear from the users desktop.

   \sa isTearOffMenuVisible(), isTearOffEnabled()
*/
void QMenu::hideTearOffMenu()
{
    if (QWidget *w = d_func()->tornPopup)
        w->close();
}


/*!
  Sets the currently highlighted action to \a act.
*/
void QMenu::setActiveAction(QAction *act)
{
    Q_D(QMenu);
    d->setCurrentAction(act, 0);
    if (d->scroll)
        d->scrollMenu(act, QMenuPrivate::QMenuScroller::ScrollCenter);
}


/*!
    Returns the currently highlighted action, or 0 if no
    action is currently highlighted.
*/
QAction *QMenu::activeAction() const
{
    return d_func()->currentAction;
}

/*!
    \since 4.2

    Returns \c true if there are no visible actions inserted into the menu, false
    otherwise.

    \sa QWidget::actions()
*/

bool QMenu::isEmpty() const
{
    bool ret = true;
    for(int i = 0; ret && i < actions().count(); ++i) {
        const QAction *action = actions().at(i);
        if (!action->isSeparator() && action->isVisible()) {
            ret = false;
        }
    }
    return ret;
}

/*!
    Removes all the menu's actions. Actions owned by the menu and not
    shown in any other widget are deleted.

    \sa removeAction()
*/
void QMenu::clear()
{
    QList<QAction*> acts = actions();

    for(int i = 0; i < acts.size(); i++) {
        removeAction(acts[i]);
        if (acts[i]->parent() == this && acts[i]->d_func()->widgets.isEmpty())
            delete acts[i];
    }
}

/*!
  If a menu does not fit on the screen it lays itself out so that it
  does fit. It is style dependent what layout means (for example, on
  Windows it will use multiple columns).

  This functions returns the number of columns necessary.
*/
int QMenu::columnCount() const
{
    return d_func()->ncols;
}

/*!
  Returns the item at \a pt; returns 0 if there is no item there.
*/
QAction *QMenu::actionAt(const QPoint &pt) const
{
    if (QAction *ret = d_func()->actionAt(pt))
        return ret;
    return 0;
}

/*!
  Returns the geometry of action \a act.
*/
QRect QMenu::actionGeometry(QAction *act) const
{
    return d_func()->actionRect(act);
}

/*!
    \reimp
*/
QSize QMenu::sizeHint() const
{
    Q_D(const QMenu);
    d->updateActionRects();

    QSize s;
    for (int i = 0; i < d->actionRects.count(); ++i) {
        const QRect &rect = d->actionRects.at(i);
        if (rect.isNull())
            continue;
        if (rect.bottom() >= s.height())
            s.setHeight(rect.y() + rect.height());
        if (rect.right() >= s.width())
            s.setWidth(rect.x() + rect.width());
    }
    // Note that the action rects calculated above already include
    // the top and left margins, so we only need to add margins for
    // the bottom and right.
    QStyleOption opt(0);
    opt.init(this);
    const int fw = style()->pixelMetric(QStyle::PM_MenuPanelWidth, &opt, this);
    s.rwidth() += style()->pixelMetric(QStyle::PM_MenuHMargin, &opt, this) + fw + d->rightmargin;
    s.rheight() += style()->pixelMetric(QStyle::PM_MenuVMargin, &opt, this) + fw + d->bottommargin;

    return style()->sizeFromContents(QStyle::CT_Menu, &opt,
                                    s.expandedTo(QApplication::globalStrut()), this);
}

/*!
    Displays the menu so that the action \a atAction will be at the
    specified \e global position \a p. To translate a widget's local
    coordinates into global coordinates, use QWidget::mapToGlobal().

    When positioning a menu with exec() or popup(), bear in mind that
    you cannot rely on the menu's current size(). For performance
    reasons, the menu adapts its size only when necessary, so in many
    cases, the size before and after the show is different. Instead,
    use sizeHint() which calculates the proper size depending on the
    menu's current contents.

    \sa QWidget::mapToGlobal(), exec()
*/
void QMenu::popup(const QPoint &p, QAction *atAction)
{
    Q_D(QMenu);
    if (d->scroll) { // reset scroll state from last popup
        if (d->scroll->scrollOffset)
            d->itemsDirty = 1; // sizeHint will be incorrect if there is previous scroll
        d->scroll->scrollOffset = 0;
        d->scroll->scrollFlags = QMenuPrivate::QMenuScroller::ScrollNone;
    }
    d->tearoffHighlighted = 0;
    d->motions = 0;
    d->doChildEffects = true;
    d->updateLayoutDirection();

#ifndef QT_NO_MENUBAR
    // if this menu is part of a chain attached to a QMenuBar, set the
    // _NET_WM_WINDOW_TYPE_DROPDOWN_MENU X11 window type
    setAttribute(Qt::WA_X11NetWmWindowTypeDropDownMenu, qobject_cast<QMenuBar *>(d->topCausedWidget()) != 0);
#endif

    ensurePolished(); // Get the right font
    emit aboutToShow();
    const bool actionListChanged = d->itemsDirty;
    d->updateActionRects();
    QPoint pos;
    QPushButton *causedButton = qobject_cast<QPushButton*>(d->causedPopup.widget);
    if (actionListChanged && causedButton)
        pos = QPushButtonPrivate::get(causedButton)->adjustedMenuPosition();
    else
        pos = p;

    QSize size = sizeHint();
    QRect screen;
#ifndef QT_NO_GRAPHICSVIEW
    bool isEmbedded = !bypassGraphicsProxyWidget(this) && d->nearestGraphicsProxyWidget(this);
    if (isEmbedded)
        screen = d->popupGeometry(this);
    else
#endif
    screen = d->popupGeometry(QApplication::desktop()->screenNumber(p));
    const int desktopFrame = style()->pixelMetric(QStyle::PM_MenuDesktopFrameWidth, 0, this);
    bool adjustToDesktop = !window()->testAttribute(Qt::WA_DontShowOnScreen);

    // if the screens have very different geometries and the menu is too big, we have to recalculate
    if (size.height() > screen.height() || size.width() > screen.width()) {
        size = d->adjustMenuSizeForScreen(screen);
        adjustToDesktop = true;
    }
    // Layout is not right, we might be able to save horizontal space
    if (d->ncols >1 && size.height() < screen.height()) {
        size = d->adjustMenuSizeForScreen(screen);
        adjustToDesktop = true;
    }

#ifdef QT_KEYPAD_NAVIGATION
    if (!atAction && QApplication::keypadNavigationEnabled()) {
        // Try to have one item activated
        if (d->defaultAction && d->defaultAction->isEnabled()) {
            atAction = d->defaultAction;
            // TODO: This works for first level menus, not yet sub menus
        } else {
            foreach (QAction *action, d->actions)
                if (action->isEnabled()) {
                    atAction = action;
                    break;
                }
        }
        d->currentAction = atAction;
    }
#endif
    if (d->ncols > 1) {
        pos.setY(screen.top() + desktopFrame);
    } else if (atAction) {
        for (int i = 0, above_height = 0; i < d->actions.count(); i++) {
            QAction *action = d->actions.at(i);
            if (action == atAction) {
                int newY = pos.y() - above_height;
                if (d->scroll && newY < desktopFrame) {
                    d->scroll->scrollFlags = d->scroll->scrollFlags
                                             | QMenuPrivate::QMenuScroller::ScrollUp;
                    d->scroll->scrollOffset = newY;
                    newY = desktopFrame;
                }
                pos.setY(newY);

                if (d->scroll && d->scroll->scrollFlags != QMenuPrivate::QMenuScroller::ScrollNone
                    && !style()->styleHint(QStyle::SH_Menu_FillScreenWithScroll, 0, this)) {
                    int below_height = above_height + d->scroll->scrollOffset;
                    for (int i2 = i; i2 < d->actionRects.count(); i2++)
                        below_height += d->actionRects.at(i2).height();
                    size.setHeight(below_height);
                }
                break;
            } else {
                above_height += d->actionRects.at(i).height();
            }
        }
    }

    QPoint mouse = QCursor::pos();
    d->mousePopupPos = mouse;
    const bool snapToMouse = !d->causedPopup.widget && (QRect(p.x() - 3, p.y() - 3, 6, 6).contains(mouse));

    const QSize menuSize(sizeHint());
    if (adjustToDesktop) {
        // handle popup falling "off screen"
        if (isRightToLeft()) {
            if (snapToMouse) // position flowing left from the mouse
                pos.setX(mouse.x() - size.width());

#ifndef QT_NO_MENUBAR
            // if the menu is in a menubar or is a submenu, it should be right-aligned
            if (qobject_cast<QMenuBar*>(d->causedPopup.widget) || qobject_cast<QMenu*>(d->causedPopup.widget))
                pos.rx() -= size.width();
#endif //QT_NO_MENUBAR

            if (pos.x() < screen.left() + desktopFrame)
                pos.setX(qMax(p.x(), screen.left() + desktopFrame));
            if (pos.x() + size.width() - 1 > screen.right() - desktopFrame)
                pos.setX(qMax(p.x() - size.width(), screen.right() - desktopFrame - size.width() + 1));
        } else {
            if (pos.x() + size.width() - 1 > screen.right() - desktopFrame)
                pos.setX(screen.right() - desktopFrame - size.width() + 1);
            if (pos.x() < screen.left() + desktopFrame)
                pos.setX(screen.left() + desktopFrame);
        }
        if (pos.y() + size.height() - 1 > screen.bottom() - desktopFrame) {
            if(snapToMouse)
                pos.setY(qMin(mouse.y() - (size.height() + desktopFrame), screen.bottom()-desktopFrame-size.height()+1));
            else
                pos.setY(qMax(p.y() - (size.height() + desktopFrame), screen.bottom()-desktopFrame-size.height()+1));
        } else if (pos.y() < screen.top() + desktopFrame) {
            pos.setY(screen.top() + desktopFrame);
        }

        if (pos.y() < screen.top() + desktopFrame)
            pos.setY(screen.top() + desktopFrame);
        if (pos.y() + menuSize.height() - 1 > screen.bottom() - desktopFrame) {
            if (d->scroll) {
                d->scroll->scrollFlags |= uint(QMenuPrivate::QMenuScroller::ScrollDown);
                int y = qMax(screen.y(),pos.y());
                size.setHeight(screen.bottom() - (desktopFrame * 2) - y);
            } else {
                // Too big for screen, bias to see bottom of menu (for some reason)
                pos.setY(screen.bottom() - size.height() + 1);
            }
        }
    }
    const int subMenuOffset = style()->pixelMetric(QStyle::PM_SubMenuOverlap, 0, this);
    QMenu *caused = qobject_cast<QMenu*>(d_func()->causedPopup.widget);
    if (caused && caused->geometry().width() + menuSize.width() + subMenuOffset < screen.width()) {
        QRect parentActionRect(caused->d_func()->actionRect(caused->d_func()->currentAction));
        const QPoint actionTopLeft = caused->mapToGlobal(parentActionRect.topLeft());
        parentActionRect.moveTopLeft(actionTopLeft);
        if (isRightToLeft()) {
            if ((pos.x() + menuSize.width() > parentActionRect.left() - subMenuOffset)
                && (pos.x() < parentActionRect.right()))
            {
                pos.rx() = parentActionRect.left() - menuSize.width();
                if (pos.x() < screen.x())
                    pos.rx() = parentActionRect.right();
                if (pos.x() + menuSize.width() > screen.x() + screen.width())
                    pos.rx() = screen.x();
            }
        } else {
            if ((pos.x() < parentActionRect.right() + subMenuOffset)
                && (pos.x() + menuSize.width() > parentActionRect.left()))
            {
                pos.rx() = parentActionRect.right();
                if (pos.x() + menuSize.width() > screen.x() + screen.width())
                    pos.rx() = parentActionRect.left() - menuSize.width();
                if (pos.x() < screen.x())
                    pos.rx() = screen.x() + screen.width() - menuSize.width();
            }
        }
    }
    setGeometry(QRect(pos, size));
#ifndef QT_NO_EFFECTS
    int hGuess = isRightToLeft() ? QEffects::LeftScroll : QEffects::RightScroll;
    int vGuess = QEffects::DownScroll;
    if (isRightToLeft()) {
        if ((snapToMouse && (pos.x() + size.width() / 2 > mouse.x())) ||
           (qobject_cast<QMenu*>(d->causedPopup.widget) && pos.x() + size.width() / 2 > d->causedPopup.widget->x()))
            hGuess = QEffects::RightScroll;
    } else {
        if ((snapToMouse && (pos.x() + size.width() / 2 < mouse.x())) ||
           (qobject_cast<QMenu*>(d->causedPopup.widget) && pos.x() + size.width() / 2 < d->causedPopup.widget->x()))
            hGuess = QEffects::LeftScroll;
    }

#ifndef QT_NO_MENUBAR
    if ((snapToMouse && (pos.y() + size.height() / 2 < mouse.y())) ||
       (qobject_cast<QMenuBar*>(d->causedPopup.widget) &&
        pos.y() + size.width() / 2 < d->causedPopup.widget->mapToGlobal(d->causedPopup.widget->pos()).y()))
       vGuess = QEffects::UpScroll;
#endif
    if (QApplication::isEffectEnabled(Qt::UI_AnimateMenu)) {
        bool doChildEffects = true;
#ifndef QT_NO_MENUBAR
        if (QMenuBar *mb = qobject_cast<QMenuBar*>(d->causedPopup.widget)) {
            doChildEffects = mb->d_func()->doChildEffects;
            mb->d_func()->doChildEffects = false;
        } else
#endif
        if (QMenu *m = qobject_cast<QMenu*>(d->causedPopup.widget)) {
            doChildEffects = m->d_func()->doChildEffects;
            m->d_func()->doChildEffects = false;
        }

        if (doChildEffects) {
            if (QApplication::isEffectEnabled(Qt::UI_FadeMenu))
                qFadeEffect(this);
            else if (d->causedPopup.widget)
                qScrollEffect(this, qobject_cast<QMenu*>(d->causedPopup.widget) ? hGuess : vGuess);
            else
                qScrollEffect(this, hGuess | vGuess);
        } else {
            // kill any running effect
            qFadeEffect(0);
            qScrollEffect(0);

            show();
        }
    } else
#endif
    {
        show();
    }

#ifndef QT_NO_ACCESSIBILITY
    QAccessibleEvent event(this, QAccessible::PopupMenuStart);
    QAccessible::updateAccessibility(&event);
#endif
}

/*!
    Executes this menu synchronously.

    This is equivalent to \c{exec(pos())}.

    This returns the triggered QAction in either the popup menu or one
    of its submenus, or 0 if no item was triggered (normally because
    the user pressed Esc).

    In most situations you'll want to specify the position yourself,
    for example, the current mouse position:
    \snippet code/src_gui_widgets_qmenu.cpp 0
    or aligned to a widget:
    \snippet code/src_gui_widgets_qmenu.cpp 1
    or in reaction to a QMouseEvent *e:
    \snippet code/src_gui_widgets_qmenu.cpp 2
*/
QAction *QMenu::exec()
{
    return exec(pos());
}


/*!
    \overload

    Executes this menu synchronously.

    Pops up the menu so that the action \a action will be at the
    specified \e global position \a p. To translate a widget's local
    coordinates into global coordinates, use QWidget::mapToGlobal().

    This returns the triggered QAction in either the popup menu or one
    of its submenus, or 0 if no item was triggered (normally because
    the user pressed Esc).

    Note that all signals are emitted as usual. If you connect a
    QAction to a slot and call the menu's exec(), you get the result
    both via the signal-slot connection and in the return value of
    exec().

    Common usage is to position the menu at the current mouse
    position:
    \snippet code/src_gui_widgets_qmenu.cpp 3
    or aligned to a widget:
    \snippet code/src_gui_widgets_qmenu.cpp 4
    or in reaction to a QMouseEvent *e:
    \snippet code/src_gui_widgets_qmenu.cpp 5

    When positioning a menu with exec() or popup(), bear in mind that
    you cannot rely on the menu's current size(). For performance
    reasons, the menu adapts its size only when necessary. So in many
    cases, the size before and after the show is different. Instead,
    use sizeHint() which calculates the proper size depending on the
    menu's current contents.

    \sa popup(), QWidget::mapToGlobal()
*/
QAction *QMenu::exec(const QPoint &p, QAction *action)
{
    Q_D(QMenu);
    ensurePolished();
    createWinId();
    QEventLoop eventLoop;
    d->eventLoop = &eventLoop;
    popup(p, action);

    QPointer<QObject> guard = this;
    (void) eventLoop.exec();
    if (guard.isNull())
        return 0;

    action = d->syncAction;
    d->syncAction = 0;
    d->eventLoop = 0;
    return action;
}

/*!
    \overload

    Executes a menu synchronously.

    The menu's actions are specified by the list of \a actions. The menu will
    pop up so that the specified action, \a at, appears at global position \a
    pos. If \a at is not specified then the menu appears at position \a
    pos. \a parent is the menu's parent widget; specifying the parent will
    provide context when \a pos alone is not enough to decide where the menu
    should go (e.g., with multiple desktops or when the parent is embedded in
    QGraphicsView).

    The function returns the triggered QAction in either the popup
    menu or one of its submenus, or 0 if no item was triggered
    (normally because the user pressed Esc).

    This is equivalent to:
    \snippet code/src_gui_widgets_qmenu.cpp 6

    \sa popup(), QWidget::mapToGlobal()
*/
#if QT_VERSION >= QT_VERSION_CHECK(6,0,0)
QAction *QMenu::exec(const QList<QAction *> &actions, const QPoint &pos, QAction *at, QWidget *parent)
#else
QAction *QMenu::exec(QList<QAction*> actions, const QPoint &pos, QAction *at, QWidget *parent)
#endif
{
    QMenu menu(parent);
    menu.addActions(actions);
    return menu.exec(pos, at);
}

/*!
  \reimp
*/
void QMenu::hideEvent(QHideEvent *)
{
    Q_D(QMenu);
    emit aboutToHide();
    if (d->eventLoop)
        d->eventLoop->exit();
    d->setCurrentAction(0);
#ifndef QT_NO_ACCESSIBILITY
    QAccessibleEvent event(this, QAccessible::PopupMenuEnd);
    QAccessible::updateAccessibility(&event);
#endif
#ifndef QT_NO_MENUBAR
    if (QMenuBar *mb = qobject_cast<QMenuBar*>(d->causedPopup.widget))
        mb->d_func()->setCurrentAction(0);
#endif
    d->mouseDown = 0;
    d->hasHadMouse = false;
    if (d->activeMenu)
        d->hideMenu(d->activeMenu);
    d->causedPopup.widget = 0;
    d->causedPopup.action = 0;
    if (d->scroll)
        d->scroll->scrollTimer.stop(); //make sure the timer stops
}

/*!
  \reimp
*/
void QMenu::paintEvent(QPaintEvent *e)
{
    Q_D(QMenu);
    d->updateActionRects();
    QPainter p(this);
    QRegion emptyArea = QRegion(rect());

    QStyleOptionMenuItem menuOpt;
    menuOpt.initFrom(this);
    menuOpt.state = QStyle::State_None;
    menuOpt.checkType = QStyleOptionMenuItem::NotCheckable;
    menuOpt.maxIconWidth = 0;
    menuOpt.tabWidth = 0;
    style()->drawPrimitive(QStyle::PE_PanelMenu, &menuOpt, &p, this);

    //draw the items that need updating..
    for (int i = 0; i < d->actions.count(); ++i) {
        QAction *action = d->actions.at(i);
        QRect adjustedActionRect = d->actionRects.at(i);
        if (!e->rect().intersects(adjustedActionRect)
            || d->widgetItems.value(action))
           continue;
        //set the clip region to be extra safe (and adjust for the scrollers)
        QRegion adjustedActionReg(adjustedActionRect);
        emptyArea -= adjustedActionReg;
        p.setClipRegion(adjustedActionReg);

        QStyleOptionMenuItem opt;
        initStyleOption(&opt, action);
        opt.rect = adjustedActionRect;
        style()->drawControl(QStyle::CE_MenuItem, &opt, &p, this);
    }

    const int fw = style()->pixelMetric(QStyle::PM_MenuPanelWidth, 0, this);
    //draw the scroller regions..
    if (d->scroll) {
        menuOpt.menuItemType = QStyleOptionMenuItem::Scroller;
        menuOpt.state |= QStyle::State_Enabled;
        if (d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollUp) {
            menuOpt.rect.setRect(fw, fw, width() - (fw * 2), d->scrollerHeight());
            emptyArea -= QRegion(menuOpt.rect);
            p.setClipRect(menuOpt.rect);
            style()->drawControl(QStyle::CE_MenuScroller, &menuOpt, &p, this);
        }
        if (d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollDown) {
            menuOpt.rect.setRect(fw, height() - d->scrollerHeight() - fw, width() - (fw * 2),
                                     d->scrollerHeight());
            emptyArea -= QRegion(menuOpt.rect);
            menuOpt.state |= QStyle::State_DownArrow;
            p.setClipRect(menuOpt.rect);
            style()->drawControl(QStyle::CE_MenuScroller, &menuOpt, &p, this);
        }
    }
    //paint the tear off..
    if (d->tearoff) {
        menuOpt.menuItemType = QStyleOptionMenuItem::TearOff;
        menuOpt.rect.setRect(fw, fw, width() - (fw * 2),
                             style()->pixelMetric(QStyle::PM_MenuTearoffHeight, 0, this));
        if (d->scroll && d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollUp)
            menuOpt.rect.translate(0, d->scrollerHeight());
        emptyArea -= QRegion(menuOpt.rect);
        p.setClipRect(menuOpt.rect);
        menuOpt.state = QStyle::State_None;
        if (d->tearoffHighlighted)
            menuOpt.state |= QStyle::State_Selected;
        style()->drawControl(QStyle::CE_MenuTearoff, &menuOpt, &p, this);
    }
    //draw border
    if (fw) {
        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_MenuPanelWidth);
        frame.midLineWidth = 0;
        style()->drawPrimitive(QStyle::PE_FrameMenu, &frame, &p, this);
    }

    //finally the rest of the space
    p.setClipRegion(emptyArea);
    menuOpt.state = QStyle::State_None;
    menuOpt.menuItemType = QStyleOptionMenuItem::EmptyArea;
    menuOpt.checkType = QStyleOptionMenuItem::NotCheckable;
    menuOpt.rect = rect();
    menuOpt.menuRect = rect();
    style()->drawControl(QStyle::CE_MenuEmptyArea, &menuOpt, &p, this);
}

#ifndef QT_NO_WHEELEVENT
/*!
  \reimp
*/
void QMenu::wheelEvent(QWheelEvent *e)
{
    Q_D(QMenu);
    if (d->scroll && rect().contains(e->pos()))
        d->scrollMenu(e->delta() > 0 ?
                      QMenuPrivate::QMenuScroller::ScrollUp : QMenuPrivate::QMenuScroller::ScrollDown);
}
#endif

/*!
  \reimp
*/
void QMenu::mousePressEvent(QMouseEvent *e)
{
    Q_D(QMenu);
    if (d->aboutToHide || d->mouseEventTaken(e))
        return;
    if (!rect().contains(e->pos())) {
         if (d->noReplayFor
             && QRect(d->noReplayFor->mapToGlobal(QPoint()), d->noReplayFor->size()).contains(e->globalPos()))
             setAttribute(Qt::WA_NoMouseReplay);
         if (d->eventLoop) // synchronous operation
             d->syncAction = 0;
        d->hideUpToMenuBar();
        return;
    }
    d->mouseDown = this;

    QAction *action = d->actionAt(e->pos());
    d->setCurrentAction(action, 20);
    update();
}

/*!
  \reimp
*/
void QMenu::mouseReleaseEvent(QMouseEvent *e)
{
    Q_D(QMenu);
    if (d->aboutToHide || d->mouseEventTaken(e))
        return;
    if(d->mouseDown != this) {
        d->mouseDown = 0;
        return;
    }

    d->mouseDown = 0;
    d->setSyncAction();
    QAction *action = d->actionAt(e->pos());

    if (action && action == d->currentAction) {
        if (!action->menu()){
#if defined(Q_OS_WIN)
            //On Windows only context menus can be activated with the right button
            if (e->button() == Qt::LeftButton || d->topCausedWidget() == 0)
#endif
                d->activateAction(action, QAction::Trigger);
        }
    } else if ((!action || action->isEnabled()) && d->hasMouseMoved(e->globalPos())) {
        d->hideUpToMenuBar();
    }
}

/*!
  \reimp
*/
void QMenu::changeEvent(QEvent *e)
{
    Q_D(QMenu);
    if (e->type() == QEvent::StyleChange || e->type() == QEvent::FontChange ||
        e->type() == QEvent::LayoutDirectionChange) {
        d->itemsDirty = 1;
        setMouseTracking(style()->styleHint(QStyle::SH_Menu_MouseTracking, 0, this));
        if (isVisible())
            resize(sizeHint());
        if (!style()->styleHint(QStyle::SH_Menu_Scrollable, 0, this)) {
            delete d->scroll;
            d->scroll = 0;
        } else if (!d->scroll) {
            d->scroll = new QMenuPrivate::QMenuScroller;
            d->scroll->scrollFlags = QMenuPrivate::QMenuScroller::ScrollNone;
        }
    } else if (e->type() == QEvent::EnabledChange) {
        if (d->tornPopup) // torn-off menu
            d->tornPopup->setEnabled(isEnabled());
        d->menuAction->setEnabled(isEnabled());
        if (!d->platformMenu.isNull())
            d->platformMenu->setEnabled(isEnabled());
    }
    QWidget::changeEvent(e);
}


/*!
  \reimp
*/
bool
QMenu::event(QEvent *e)
{
    Q_D(QMenu);
    switch (e->type()) {
    case QEvent::Polish:
        d->updateLayoutDirection();
        break;
    case QEvent::ShortcutOverride: {
            QKeyEvent *kev = static_cast<QKeyEvent*>(e);
            if (kev->key() == Qt::Key_Up || kev->key() == Qt::Key_Down
                || kev->key() == Qt::Key_Left || kev->key() == Qt::Key_Right
                || kev->key() == Qt::Key_Enter || kev->key() == Qt::Key_Return
                || kev->key() == Qt::Key_Escape) {
                e->accept();
                return true;
            }
        }
        break;
    case QEvent::KeyPress: {
        QKeyEvent *ke = (QKeyEvent*)e;
        if (ke->key() == Qt::Key_Tab || ke->key() == Qt::Key_Backtab) {
            keyPressEvent(ke);
            return true;
        }
    } break;
    case QEvent::ContextMenu:
        if (d->delayState.timer.isActive()) {
            d->delayState.stop();
            internalDelayedPopup();
        }
        break;
    case QEvent::Resize: {
        QStyleHintReturnMask menuMask;
        QStyleOption option;
        option.initFrom(this);
        if (style()->styleHint(QStyle::SH_Menu_Mask, &option, this, &menuMask)) {
            setMask(menuMask.region);
        }
        d->itemsDirty = 1;
        d->updateActionRects();
        break; }
    case QEvent::Show:
        d->mouseDown = 0;
        d->updateActionRects();
        d->sloppyState.reset();
        if (d->currentAction)
            d->popupAction(d->currentAction, 0, false);
        break;
#ifndef QT_NO_TOOLTIP
    case QEvent::ToolTip:
        if (d->toolTipsVisible) {
            const QHelpEvent *ev = static_cast<const QHelpEvent*>(e);
            if (const QAction *action = actionAt(ev->pos())) {
                const QString toolTip = action->d_func()->tooltip;
                if (!toolTip.isEmpty())
                    QToolTip::showText(ev->globalPos(), toolTip, this);
                return true;
            }
        }
        break;
#endif // QT_NO_TOOLTIP
#ifndef QT_NO_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
    default:
        break;
    }
    return QWidget::event(e);
}

/*!
    \reimp
*/
bool QMenu::focusNextPrevChild(bool next)
{
    setFocus();
    QKeyEvent ev(QEvent::KeyPress, next ? Qt::Key_Tab : Qt::Key_Backtab, Qt::NoModifier);
    keyPressEvent(&ev);
    return true;
}

/*!
  \reimp
*/
void QMenu::keyPressEvent(QKeyEvent *e)
{
    Q_D(QMenu);
    d->updateActionRects();
    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;
    }
#ifndef Q_OS_MAC
    if (key == Qt::Key_Tab) //means down
        key = Qt::Key_Down;
    if (key == Qt::Key_Backtab) //means up
        key = Qt::Key_Up;
#endif

    bool key_consumed = false;
    switch(key) {
    case Qt::Key_Home:
        key_consumed = true;
        if (d->scroll)
            d->scrollMenu(QMenuPrivate::QMenuScroller::ScrollTop, true);
        break;
    case Qt::Key_End:
        key_consumed = true;
        if (d->scroll)
            d->scrollMenu(QMenuPrivate::QMenuScroller::ScrollBottom, true);
        break;
    case Qt::Key_PageUp:
        key_consumed = true;
        if (d->currentAction && d->scroll) {
            if(d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollUp)
                d->scrollMenu(QMenuPrivate::QMenuScroller::ScrollUp, true, true);
            else
                d->scrollMenu(QMenuPrivate::QMenuScroller::ScrollTop, true);
        }
        break;
    case Qt::Key_PageDown:
        key_consumed = true;
        if (d->currentAction && d->scroll) {
            if(d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollDown)
                d->scrollMenu(QMenuPrivate::QMenuScroller::ScrollDown, true, true);
            else
                d->scrollMenu(QMenuPrivate::QMenuScroller::ScrollBottom, true);
        }
        break;
    case Qt::Key_Up:
    case Qt::Key_Down: {
        key_consumed = true;
        QAction *nextAction = 0;
        QMenuPrivate::QMenuScroller::ScrollLocation scroll_loc = QMenuPrivate::QMenuScroller::ScrollStay;
        if (!d->currentAction) {
            if(key == Qt::Key_Down) {
                for(int i = 0; i < d->actions.count(); ++i) {
                    QAction *act = d->actions.at(i);
                    if (d->actionRects.at(i).isNull())
                        continue;
                    if (!act->isSeparator() &&
                        (style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, this)
                         || act->isEnabled())) {
                        nextAction = act;
                        break;
                    }
                }
            } else {
                for(int i = d->actions.count()-1; i >= 0; --i) {
                    QAction *act = d->actions.at(i);
                    if (d->actionRects.at(i).isNull())
                        continue;
                    if (!act->isSeparator() &&
                        (style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, this)
                         || act->isEnabled())) {
                        nextAction = act;
                        break;
                    }
                }
            }
        } else {
            for(int i = 0, y = 0; !nextAction && i < d->actions.count(); i++) {
                QAction *act = d->actions.at(i);
                if (act == d->currentAction) {
                    if (key == Qt::Key_Up) {
                        for(int next_i = i-1; true; next_i--) {
                            if (next_i == -1) {
                                if(!style()->styleHint(QStyle::SH_Menu_SelectionWrap, 0, this))
                                    break;
                                if (d->scroll)
                                    scroll_loc = QMenuPrivate::QMenuScroller::ScrollBottom;
                                next_i = d->actionRects.count()-1;
                            }
                            QAction *next = d->actions.at(next_i);
                            if (next == d->currentAction)
                                break;
                            if (d->actionRects.at(next_i).isNull())
                                continue;
                            if (next->isSeparator() ||
                               (!next->isEnabled() &&
                                !style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, this)))
                                continue;
                            nextAction = next;
                            if (d->scroll && (d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollUp)) {
                                int topVisible = d->scrollerHeight();
                                if (d->tearoff)
                                    topVisible += style()->pixelMetric(QStyle::PM_MenuTearoffHeight, 0, this);
                                if (((y + d->scroll->scrollOffset) - topVisible) <= d->actionRects.at(next_i).height())
                                    scroll_loc = QMenuPrivate::QMenuScroller::ScrollTop;
                            }
                            break;
                        }
                        if (!nextAction && d->tearoff)
                            d->tearoffHighlighted = 1;
                    } else {
                        y += d->actionRects.at(i).height();
                        for(int next_i = i+1; true; next_i++) {
                            if (next_i == d->actionRects.count()) {
                                if(!style()->styleHint(QStyle::SH_Menu_SelectionWrap, 0, this))
                                    break;
                                if (d->scroll)
                                    scroll_loc = QMenuPrivate::QMenuScroller::ScrollTop;
                                next_i = 0;
                            }
                            QAction *next = d->actions.at(next_i);
                            if (next == d->currentAction)
                                break;
                            if (d->actionRects.at(next_i).isNull())
                                continue;
                            if (next->isSeparator() ||
                               (!next->isEnabled() &&
                                !style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, this)))
                                continue;
                            nextAction = next;
                            if (d->scroll && (d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollDown)) {
                                int bottomVisible = height() - d->scrollerHeight();
                                if (d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollUp)
                                    bottomVisible -= d->scrollerHeight();
                                if (d->tearoff)
                                    bottomVisible -= style()->pixelMetric(QStyle::PM_MenuTearoffHeight, 0, this);
                                if ((y + d->scroll->scrollOffset + d->actionRects.at(next_i).height()) > bottomVisible)
                                    scroll_loc = QMenuPrivate::QMenuScroller::ScrollBottom;
                            }
                            break;
                        }
                    }
                    break;
                }
                y += d->actionRects.at(i).height();
            }
        }
        if (nextAction) {
            if (d->scroll && scroll_loc != QMenuPrivate::QMenuScroller::ScrollStay) {
                d->scroll->scrollTimer.stop();
                d->scrollMenu(nextAction, scroll_loc);
            }
            d->setCurrentAction(nextAction, /*popup*/-1, QMenuPrivate::SelectedFromKeyboard);
        }
        break; }

    case Qt::Key_Right:
        if (d->currentAction && d->currentAction->isEnabled() && d->currentAction->menu()) {
            d->popupAction(d->currentAction, 0, true);
            key_consumed = true;
            break;
        }
        //FALL THROUGH
    case Qt::Key_Left: {
        if (d->currentAction && !d->scroll) {
            QAction *nextAction = 0;
            if (key == Qt::Key_Left) {
                QRect actionR = d->actionRect(d->currentAction);
                for(int x = actionR.left()-1; !nextAction && x >= 0; x--)
                    nextAction = d->actionAt(QPoint(x, actionR.center().y()));
            } else {
                QRect actionR = d->actionRect(d->currentAction);
                for(int x = actionR.right()+1; !nextAction && x < width(); x++)
                    nextAction = d->actionAt(QPoint(x, actionR.center().y()));
            }
            if (nextAction) {
                d->setCurrentAction(nextAction, /*popup*/-1, QMenuPrivate::SelectedFromKeyboard);
                key_consumed = true;
            }
        }
        if (!key_consumed && key == Qt::Key_Left && qobject_cast<QMenu*>(d->causedPopup.widget)) {
            QPointer<QWidget> caused = d->causedPopup.widget;
            d->hideMenu(this);
            if (caused)
                caused->setFocus();
            key_consumed = true;
        }
        break; }

    case Qt::Key_Alt:
        if (d->tornoff)
            break;

        key_consumed = true;
        if (style()->styleHint(QStyle::SH_MenuBar_AltKeyNavigation, 0, this))
        {
            d->hideMenu(this);
#ifndef QT_NO_MENUBAR
            if (QMenuBar *mb = qobject_cast<QMenuBar*>(QApplication::focusWidget())) {
                mb->d_func()->setKeyboardMode(false);
            }
#endif
        }
        break;

    case Qt::Key_Escape:
#ifdef QT_KEYPAD_NAVIGATION
    case Qt::Key_Back:
#endif
        key_consumed = true;
        if (d->tornoff) {
            close();
            return;
        }
        {
            QPointer<QWidget> caused = d->causedPopup.widget;
            d->hideMenu(this); // hide after getting causedPopup
#ifndef QT_NO_MENUBAR
            if (QMenuBar *mb = qobject_cast<QMenuBar*>(caused)) {
                mb->d_func()->setCurrentAction(d->menuAction);
                mb->d_func()->setKeyboardMode(true);
            }
#endif
        }
        break;

    case Qt::Key_Space:
        if (!style()->styleHint(QStyle::SH_Menu_SpaceActivatesItem, 0, this))
            break;
        // for motif, fall through
#ifdef QT_KEYPAD_NAVIGATION
    case Qt::Key_Select:
#endif
    case Qt::Key_Return:
    case Qt::Key_Enter: {
        if (!d->currentAction) {
            d->setFirstActionActive();
            key_consumed = true;
            break;
        }

        d->setSyncAction();

        if (d->currentAction->menu())
            d->popupAction(d->currentAction, 0, true);
        else
            d->activateAction(d->currentAction, QAction::Trigger);
        key_consumed = true;
        break; }

#ifndef QT_NO_WHATSTHIS
    case Qt::Key_F1:
        if (!d->currentAction || d->currentAction->whatsThis().isNull())
            break;
        QWhatsThis::enterWhatsThisMode();
        d->activateAction(d->currentAction, QAction::Trigger);
        return;
#endif
    default:
        key_consumed = false;
    }

    if (!key_consumed) {                                // send to menu bar
        if ((!e->modifiers() || e->modifiers() == Qt::AltModifier || e->modifiers() == Qt::ShiftModifier) &&
           e->text().length()==1) {
            bool activateAction = false;
            QAction *nextAction = 0;
            if (style()->styleHint(QStyle::SH_Menu_KeyboardSearch, 0, this) && !e->modifiers()) {
                int best_match_count = 0;
                d->searchBufferTimer.start(2000, this);
                d->searchBuffer += e->text();
                for(int i = 0; i < d->actions.size(); ++i) {
                    int match_count = 0;
                    if (d->actionRects.at(i).isNull())
                        continue;
                    QAction *act = d->actions.at(i);
                    const QString act_text = act->text();
                    for(int c = 0; c < d->searchBuffer.size(); ++c) {
                        if(act_text.indexOf(d->searchBuffer.at(c), 0, Qt::CaseInsensitive) != -1)
                            ++match_count;
                    }
                    if(match_count > best_match_count) {
                        best_match_count = match_count;
                        nextAction = act;
                    }
                }
            }
#ifndef QT_NO_SHORTCUT
            else {
                int clashCount = 0;
                QAction *first = 0, *currentSelected = 0, *firstAfterCurrent = 0;
                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);
                    QKeySequence sequence = QKeySequence::mnemonic(act->text());
                    int key = sequence[0] & 0xffff;
                    if (key == c.unicode()) {
                        clashCount++;
                        if (!first)
                            first = act;
                        if (act == d->currentAction)
                            currentSelected = act;
                        else if (!firstAfterCurrent && currentSelected)
                            firstAfterCurrent = act;
                    }
                }
                if (clashCount == 1)
                    activateAction = true;
                if (clashCount >= 1) {
                    if (clashCount == 1 || !currentSelected || !firstAfterCurrent)
                        nextAction = first;
                    else
                        nextAction = firstAfterCurrent;
                }
            }
#endif
            if (nextAction) {
                key_consumed = true;
                if(d->scroll)
                    d->scrollMenu(nextAction, QMenuPrivate::QMenuScroller::ScrollCenter, false);
                d->setCurrentAction(nextAction, 0, QMenuPrivate::SelectedFromElsewhere, true);
                if (!nextAction->menu() && activateAction) {
                    d->setSyncAction();
                    d->activateAction(nextAction, QAction::Trigger);
                }
            }
        }
        if (!key_consumed) {
#ifndef QT_NO_MENUBAR
            if (QMenuBar *mb = qobject_cast<QMenuBar*>(d->topCausedWidget())) {
                QAction *oldAct = mb->d_func()->currentAction;
                QApplication::sendEvent(mb, e);
                if (mb->d_func()->currentAction != oldAct)
                    key_consumed = true;
            }
#endif
        }

#ifdef Q_OS_WIN32
        if (key_consumed && (e->key() == Qt::Key_Control || e->key() == Qt::Key_Shift || e->key() == Qt::Key_Meta))
            QApplication::beep();
#endif // Q_OS_WIN32
    }
    if (key_consumed)
        e->accept();
    else
        e->ignore();
}

/*!
  \reimp
*/
void QMenu::mouseMoveEvent(QMouseEvent *e)
{
    Q_D(QMenu);
    if (!isVisible() || d->aboutToHide || d->mouseEventTaken(e))
        return;

    d->motions++;
    if (d->motions == 0)
        return;

    d->hasHadMouse = d->hasHadMouse || rect().contains(e->pos());

    QAction *action = d->actionAt(e->pos());
    if ((!action || action->isSeparator()) && !d->sloppyState.enabled()) {
        if (d->hasHadMouse
            || (!d->currentAction || !d->currentAction->menu() || !d->currentAction->menu()->isVisible())) {
            d->setCurrentAction(action);
        }
        return;
    }

    if (e->buttons())
        d->mouseDown = this;

    if (d->activeMenu)
        d->activeMenu->d_func()->setCurrentAction(0);

    QMenuSloppyState::MouseEventResult sloppyEventResult = d->sloppyState.processMouseEvent(e->localPos(), action, d->currentAction);
    if (sloppyEventResult == QMenuSloppyState::EventShouldBePropogated) {
        d->setCurrentAction(action, d->mousePopupDelay);
    } else if (sloppyEventResult == QMenuSloppyState::EventDiscardsSloppyState) {
        d->sloppyState.reset();
        d->hideMenu(d->activeMenu);
    }
}

/*!
  \reimp
*/
void QMenu::enterEvent(QEvent *)
{
    Q_D(QMenu);
    d->hasReceievedEnter = true;
    d->sloppyState.enter();
    d->sloppyState.startTimer();
    d->motions = -1; // force us to ignore the generate mouse move in mouseMoveEvent()
}

/*!
  \reimp
*/
void QMenu::leaveEvent(QEvent *)
{
    Q_D(QMenu);
    d->hasReceievedEnter = false;
    d->sloppyState.leave();
    if (!d->activeMenu && d->currentAction)
        setActiveAction(0);
}

/*!
  \reimp
*/
void
QMenu::timerEvent(QTimerEvent *e)
{
    Q_D(QMenu);
    if (d->scroll && d->scroll->scrollTimer.timerId() == e->timerId()) {
        d->scrollMenu((QMenuPrivate::QMenuScroller::ScrollDirection)d->scroll->scrollDirection);
        if (d->scroll->scrollFlags == QMenuPrivate::QMenuScroller::ScrollNone)
            d->scroll->scrollTimer.stop();
    } else if (d->delayState.timer.timerId() == e->timerId()) {
        if (d->currentAction && !d->currentAction->menu())
            return;
        d->delayState.stop();
        d->sloppyState.stopTimer();
        internalDelayedPopup();
    } else if (d->sloppyState.isTimerId(e->timerId())) {
        d->sloppyState.timeout();
    } else if(d->searchBufferTimer.timerId() == e->timerId()) {
        d->searchBuffer.clear();
    }
}

static void copyActionToPlatformItem(const QAction *action, QPlatformMenuItem *item, QPlatformMenu *itemsMenu)
{
    item->setText(action->text());
    item->setIsSeparator(action->isSeparator());
    if (action->isIconVisibleInMenu()) {
        item->setIcon(action->icon());
        if (QWidget *w = action->parentWidget()) {
            QStyleOption opt;
            opt.init(w);
            item->setIconSize(w->style()->pixelMetric(QStyle::PM_SmallIconSize, &opt, w));
        } else {
            QStyleOption opt;
            item->setIconSize(qApp->style()->pixelMetric(QStyle::PM_SmallIconSize, &opt, 0));
        }
    } else {
        item->setIcon(QIcon());
    }
    item->setVisible(action->isVisible());
    item->setShortcut(action->shortcut());
    item->setCheckable(action->isCheckable());
    item->setChecked(action->isChecked());
    item->setFont(action->font());
    item->setRole((QPlatformMenuItem::MenuRole) action->menuRole());
    item->setEnabled(action->isEnabled());

    if (action->menu()) {
        if (!action->menu()->platformMenu())
            action->menu()->setPlatformMenu(itemsMenu->createSubMenu());
        item->setMenu(action->menu()->platformMenu());
    } else {
        item->setMenu(0);
    }
}

/*!
  \reimp
*/
void QMenu::actionEvent(QActionEvent *e)
{
    Q_D(QMenu);
    d->itemsDirty = 1;
    setAttribute(Qt::WA_Resized, false);
    if (d->tornPopup)
        d->tornPopup->syncWithMenu(this, e);
    if (e->type() == QEvent::ActionAdded) {
        if(!d->tornoff) {
            connect(e->action(), SIGNAL(triggered()), this, SLOT(_q_actionTriggered()));
            connect(e->action(), SIGNAL(hovered()), this, SLOT(_q_actionHovered()));
        }
        if (QWidgetAction *wa = qobject_cast<QWidgetAction *>(e->action())) {
            QWidget *widget = wa->requestWidget(this);
            if (widget)
                d->widgetItems.insert(wa, widget);
        }
    } else if (e->type() == QEvent::ActionRemoved) {
        e->action()->disconnect(this);
        if (e->action() == d->currentAction)
            d->currentAction = 0;
        if (QWidgetAction *wa = qobject_cast<QWidgetAction *>(e->action())) {
            if (QWidget *widget = d->widgetItems.value(wa)) {
#ifdef Q_OS_OSX
                QWidget *p = widget->parentWidget();
                if (p != this && qobject_cast<QMacNativeWidget *>(p)) {
                    // This widget was reparented into a native Mac view
                    // (see QMenuPrivate::moveWidgetToPlatformItem).
                    // Reset the parent and delete the native widget.
                    widget->setParent(this);
                    p->deleteLater();
                }
#endif
                wa->releaseWidget(widget);
            }
        }
        d->widgetItems.remove(e->action());
    }

    if (!d->platformMenu.isNull()) {
        if (e->type() == QEvent::ActionAdded) {
            QPlatformMenuItem *menuItem = d->platformMenu->createMenuItem();
            menuItem->setTag(reinterpret_cast<quintptr>(e->action()));
            QObject::connect(menuItem, SIGNAL(activated()), e->action(), SLOT(trigger()));
            QObject::connect(menuItem, SIGNAL(hovered()), e->action(), SIGNAL(hovered()));
            copyActionToPlatformItem(e->action(), menuItem, d->platformMenu);
            QPlatformMenuItem* beforeItem = d->platformMenu->menuItemForTag(reinterpret_cast<quintptr>(e->before()));
            d->platformMenu->insertMenuItem(menuItem, beforeItem);
        } else if (e->type() == QEvent::ActionRemoved) {
            QPlatformMenuItem *menuItem = d->platformMenu->menuItemForTag(reinterpret_cast<quintptr>(e->action()));
            d->platformMenu->removeMenuItem(menuItem);
            delete menuItem;
        } else if (e->type() == QEvent::ActionChanged) {
            QPlatformMenuItem *menuItem = d->platformMenu->menuItemForTag(reinterpret_cast<quintptr>(e->action()));
            if (menuItem) {
                copyActionToPlatformItem(e->action(), menuItem, d->platformMenu);
                d->platformMenu->syncMenuItem(menuItem);
            }
        }

        d->platformMenu->syncSeparatorsCollapsible(d->collapsibleSeparators);
    }

#if defined(Q_OS_WINCE) && !defined(QT_NO_MENUBAR)
    if (!d->wce_menu)
        d->wce_menu = new QMenuPrivate::QWceMenuPrivate;
    if (e->type() == QEvent::ActionAdded)
        d->wce_menu->addAction(e->action(), d->wce_menu->findAction(e->before()));
    else if (e->type() == QEvent::ActionRemoved)
        d->wce_menu->removeAction(e->action());
    else if (e->type() == QEvent::ActionChanged)
        d->wce_menu->syncAction(e->action());
#endif

    if (isVisible()) {
        d->updateActionRects();
        resize(sizeHint());
        update();
    }
}

/*!
  \internal
*/
void QMenu::internalDelayedPopup()
{
    Q_D(QMenu);
    //hide the current item
    if (QMenu *menu = d->activeMenu) {
        if (d->activeMenu->menuAction() != d->currentAction)
            d->hideMenu(menu);
    }

    if (!d->currentAction || !d->currentAction->isEnabled() || !d->currentAction->menu() ||
        !d->currentAction->menu()->isEnabled() || d->currentAction->menu()->isVisible())
        return;

    //setup
    d->activeMenu = d->currentAction->menu();
    d->activeMenu->d_func()->causedPopup.widget = this;
    d->activeMenu->d_func()->causedPopup.action = d->currentAction;

    int subMenuOffset = style()->pixelMetric(QStyle::PM_SubMenuOverlap, 0, this);
    const QRect actionRect(d->actionRect(d->currentAction));
    const QPoint rightPos(mapToGlobal(QPoint(actionRect.right() + subMenuOffset + 1, actionRect.top())));

    QPoint pos(rightPos);

    d->activeMenu->popup(pos);
    d->sloppyState.setSubMenuPopup(actionRect, d->currentAction, d->activeMenu);
}

/*!
    \fn void QMenu::aboutToHide()
    \since 4.2

    This signal is emitted just before the menu is hidden from the user.

    \sa aboutToShow(), hide()
*/

/*!
    \fn void QMenu::aboutToShow()

    This signal is emitted just before the menu is shown to the user.

    \sa aboutToHide(), show()
*/

/*!
    \fn void QMenu::triggered(QAction *action)

    This signal is emitted when an action in this menu is triggered.

    \a action is the action that caused the signal to be emitted.

    Normally, you connect each menu action's \l{QAction::}{triggered()} signal
    to its own custom slot, but sometimes you will want to connect several
    actions to a single slot, for example, when you have a group of closely
    related actions, such as "left justify", "center", "right justify".

    \note This signal is emitted for the main parent menu in a hierarchy.
    Hence, only the parent menu needs to be connected to a slot; sub-menus need
    not be connected.

    \sa hovered(), QAction::triggered()
*/

/*!
    \fn void QMenu::hovered(QAction *action)

    This signal is emitted when a menu action is highlighted; \a action
    is the action that caused the signal to be emitted.

    Often this is used to update status information.

    \sa triggered(), QAction::hovered()
*/


/*!\internal
*/
void QMenu::setNoReplayFor(QWidget *noReplayFor)
{
    d_func()->noReplayFor = noReplayFor;
}

/*!\internal
*/
QPlatformMenu *QMenu::platformMenu()
{

    return d_func()->platformMenu;
}

/*!\internal
*/
void QMenu::setPlatformMenu(QPlatformMenu *platformMenu)
{
    d_func()->setPlatformMenu(platformMenu);
    d_func()->syncPlatformMenu();
}

/*!
  \property QMenu::separatorsCollapsible
  \since 4.2

  \brief whether consecutive separators should be collapsed

  This property specifies whether consecutive separators in the menu
  should be visually collapsed to a single one. Separators at the
  beginning or the end of the menu are also hidden.

  By default, this property is \c true.
*/
bool QMenu::separatorsCollapsible() const
{
    Q_D(const QMenu);
    return d->collapsibleSeparators;
}

void QMenu::setSeparatorsCollapsible(bool collapse)
{
    Q_D(QMenu);
    if (d->collapsibleSeparators == collapse)
        return;

    d->collapsibleSeparators = collapse;
    d->itemsDirty = 1;
    if (isVisible()) {
        d->updateActionRects();
        update();
    }
    if (!d->platformMenu.isNull())
        d->platformMenu->syncSeparatorsCollapsible(collapse);
}

/*!
  \property QMenu::toolTipsVisible
  \since 5.1

  \brief whether tooltips of menu actions should be visible

  This property specifies whether action menu entries show
  their tooltip.

  By default, this property is \c false.
*/
bool QMenu::toolTipsVisible() const
{
    Q_D(const QMenu);
    return d->toolTipsVisible;
}

void QMenu::setToolTipsVisible(bool visible)
{
    Q_D(QMenu);
    if (d->toolTipsVisible == visible)
        return;

    d->toolTipsVisible = visible;
}

QT_END_NAMESPACE

// for private slots
#include "moc_qmenu.cpp"
#include "qmenu.moc"

#endif // QT_NO_MENU
