/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#include <sal/config.h>

#include <QtCustomStyle.hxx>
#include <QtFrame.hxx>
#include <QtInstance.hxx>
#include <QtMainWindow.hxx>
#include <QtMenu.hxx>
#include <QtMenu.moc>
#include <QtTools.hxx>
#include <bitmaps.hlst>
#include <strings.hrc>
#include <window.h>

#include <o3tl/safeint.hxx>
#include <vcl/qt/QtUtils.hxx>
#include <vcl/svapp.hxx>
#include <vcl/themecolors.hxx>
#include <vcl/toolkit/floatwin.hxx>

#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
#include <QtGui/QActionGroup>
#include <QtGui/QShortcut>
#else
#include <QtWidgets/QActionGroup>
#include <QtWidgets/QShortcut>
#endif
#include <QtWidgets/QButtonGroup>
#include <QtWidgets/QHBoxLayout>
#include <QtWidgets/QMenuBar>
#include <QtWidgets/QPushButton>
#include <QtWidgets/QStyle>

// LO SalMenuButtonItem::mnId is sal_uInt16, so we go with -2, as -1 has a special meaning as automatic id
constexpr int CLOSE_BUTTON_ID = -2;
const QString gButtonGroupKey("QtMenu::ButtonGroup");

static inline void lcl_force_menubar_layout_update(QMenuBar& rMenuBar)
{
    // just exists as a function to not comment it everywhere: forces reposition of the
    // corner widget after its layout changes, which will otherwise just happen on resize.
    // it unfortunatly has additional side effects; see QtMenu::GetMenuBarButtonRectPixel.
    rMenuBar.adjustSize();
}

OUString QtMenu::m_sCurrentHelpId = u""_ustr;

QtMenu::QtMenu(bool bMenuBar)
    : mpVCLMenu(nullptr)
    , mpParentSalMenu(nullptr)
    , mpFrame(nullptr)
    , mbMenuBar(bMenuBar)
    , mpQMenuBar(nullptr)
    , mpQMenu(nullptr)
    , m_pButtonGroup(nullptr)
{
}

bool QtMenu::VisibleMenuBar() { return true; }

void QtMenu::InsertQtMenuItem(QtMenuItem* pSalMenuItem, unsigned nPos)
{
    SolarMutexGuard g;
    GetQtInstance().RunInMainThread([&] {
        sal_uInt16 nId = pSalMenuItem->mnId;
        const QString aText = vclToQtStringWithAccelerator(mpVCLMenu->GetItemText(nId));
        vcl::KeyCode nAccelKey = mpVCLMenu->GetAccelKey(nId);

        pSalMenuItem->mpAction.reset();
        pSalMenuItem->mpMenu.reset();

        if (mbMenuBar)
        {
            // top-level menu
            if (validateQMenuBar())
            {
                QMenu* pQMenu = new QMenu(aText, nullptr);
                connectHelpSignalSlots(pQMenu, pSalMenuItem);
                pSalMenuItem->mpMenu.reset(pQMenu);

                if ((nPos != MENU_APPEND)
                    && (static_cast<size_t>(nPos)
                        < o3tl::make_unsigned(mpQMenuBar->actions().size())))
                {
                    mpQMenuBar->insertMenu(mpQMenuBar->actions()[nPos], pQMenu);
                }
                else
                {
                    mpQMenuBar->addMenu(pQMenu);
                }

                // correct parent menu for generated menu
                if (pSalMenuItem->mpSubMenu)
                {
                    pSalMenuItem->mpSubMenu->mpQMenu = pQMenu;
                }

                connect(pQMenu, &QMenu::aboutToShow, this,
                        [pSalMenuItem] { slotMenuAboutToShow(pSalMenuItem); });
                connect(pQMenu, &QMenu::aboutToHide, this,
                        [pSalMenuItem] { slotMenuAboutToHide(pSalMenuItem); });
            }
        }
        else
        {
            if (!mpQMenu)
            {
                // no QMenu set, instantiate own one
                mpOwnedQMenu.reset(new QMenu);
                mpQMenu = mpOwnedQMenu.get();
                connectHelpSignalSlots(mpQMenu, pSalMenuItem);
            }

            if (pSalMenuItem->mpSubMenu)
            {
                // submenu
                QMenu* pQMenu = new QMenu(aText, nullptr);
                connectHelpSignalSlots(pQMenu, pSalMenuItem);
                pSalMenuItem->mpMenu.reset(pQMenu);

                if ((nPos != MENU_APPEND)
                    && (static_cast<size_t>(nPos) < o3tl::make_unsigned(mpQMenu->actions().size())))
                {
                    mpQMenu->insertMenu(mpQMenu->actions()[nPos], pQMenu);
                }
                else
                {
                    mpQMenu->addMenu(pQMenu);
                }

                // correct parent menu for generated menu
                pSalMenuItem->mpSubMenu->mpQMenu = pQMenu;

                ReinitializeActionGroup(nPos);

                // clear all action groups since menu is recreated
                pSalMenuItem->mpSubMenu->ResetAllActionGroups();

                connect(pQMenu, &QMenu::aboutToShow, this,
                        [pSalMenuItem] { slotMenuAboutToShow(pSalMenuItem); });
                connect(pQMenu, &QMenu::aboutToHide, this,
                        [pSalMenuItem] { slotMenuAboutToHide(pSalMenuItem); });
            }
            else
            {
                if (pSalMenuItem->mnType == MenuItemType::SEPARATOR)
                {
                    QAction* pAction = new QAction(nullptr);
                    pSalMenuItem->mpAction.reset(pAction);
                    pAction->setSeparator(true);

                    if ((nPos != MENU_APPEND)
                        && (static_cast<size_t>(nPos)
                            < o3tl::make_unsigned(mpQMenu->actions().size())))
                    {
                        mpQMenu->insertAction(mpQMenu->actions()[nPos], pAction);
                    }
                    else
                    {
                        mpQMenu->addAction(pAction);
                    }

                    ReinitializeActionGroup(nPos);
                }
                else
                {
                    // leaf menu
                    QAction* pAction = new QAction(aText, nullptr);
                    pAction->setToolTip(toQString(mpVCLMenu->GetTipHelpText(nId)));
                    pSalMenuItem->mpAction.reset(pAction);

                    if ((nPos != MENU_APPEND)
                        && (static_cast<size_t>(nPos)
                            < o3tl::make_unsigned(mpQMenu->actions().size())))
                    {
                        mpQMenu->insertAction(mpQMenu->actions()[nPos], pAction);
                    }
                    else
                    {
                        mpQMenu->addAction(pAction);
                    }

                    ReinitializeActionGroup(nPos);

                    UpdateActionGroupItem(pSalMenuItem);

                    pAction->setShortcut(toQString(nAccelKey.GetName()));

                    connect(pAction, &QAction::triggered, this,
                            [pSalMenuItem] { slotMenuTriggered(pSalMenuItem); });
                    connect(pAction, &QAction::hovered, this,
                            [pSalMenuItem] { slotMenuHovered(pSalMenuItem); });
                }
            }
        }

        QAction* pAction = pSalMenuItem->getAction();
        if (pAction)
        {
            pAction->setEnabled(pSalMenuItem->mbEnabled);
            pAction->setVisible(pSalMenuItem->mbVisible);
        }
    });
}

void QtMenu::ReinitializeActionGroup(unsigned nPos)
{
    const unsigned nCount = GetItemCount();

    if (nCount == 0)
    {
        return;
    }

    if (nPos == MENU_APPEND)
    {
        nPos = nCount - 1;
    }
    else if (nPos >= nCount)
    {
        return;
    }

    QtMenuItem* pPrevItem = (nPos > 0) ? GetItemAtPos(nPos - 1) : nullptr;
    QtMenuItem* pCurrentItem = GetItemAtPos(nPos);
    QtMenuItem* pNextItem = (nPos < nCount - 1) ? GetItemAtPos(nPos + 1) : nullptr;

    if (pCurrentItem->mnType == MenuItemType::SEPARATOR)
    {
        pCurrentItem->mpActionGroup.reset();

        // if it's inserted into middle of existing group, split it into two groups:
        // first goes original group, after separator goes new group
        if (pPrevItem && pPrevItem->mpActionGroup && pNextItem && pNextItem->mpActionGroup
            && (pPrevItem->mpActionGroup == pNextItem->mpActionGroup))
        {
            std::shared_ptr<QActionGroup> pFirstActionGroup = pPrevItem->mpActionGroup;
            auto pSecondActionGroup = std::make_shared<QActionGroup>(nullptr);
            pSecondActionGroup->setExclusive(true);

            auto actions = pFirstActionGroup->actions();

            for (unsigned idx = nPos + 1; idx < nCount; ++idx)
            {
                QtMenuItem* pModifiedItem = GetItemAtPos(idx);

                if ((!pModifiedItem) || (!pModifiedItem->mpActionGroup))
                {
                    break;
                }

                pModifiedItem->mpActionGroup = pSecondActionGroup;
                auto action = pModifiedItem->getAction();

                if (actions.contains(action))
                {
                    pFirstActionGroup->removeAction(action);
                    pSecondActionGroup->addAction(action);
                }
            }
        }
    }
    else
    {
        if (!pCurrentItem->mpActionGroup)
        {
            // unless element is inserted between two separators, or a separator and an end of vector, use neighbouring group since it's shared
            if (pPrevItem && pPrevItem->mpActionGroup)
            {
                pCurrentItem->mpActionGroup = pPrevItem->mpActionGroup;
            }
            else if (pNextItem && pNextItem->mpActionGroup)
            {
                pCurrentItem->mpActionGroup = pNextItem->mpActionGroup;
            }
            else
            {
                pCurrentItem->mpActionGroup = std::make_shared<QActionGroup>(nullptr);
                pCurrentItem->mpActionGroup->setExclusive(true);
            }
        }

        // if there's also a different group after this element, merge it
        if (pNextItem && pNextItem->mpActionGroup
            && (pCurrentItem->mpActionGroup != pNextItem->mpActionGroup))
        {
            auto pFirstCheckedAction = pCurrentItem->mpActionGroup->checkedAction();
            auto pSecondCheckedAction = pNextItem->mpActionGroup->checkedAction();
            auto actions = pNextItem->mpActionGroup->actions();

            // first move all actions from second group to first one, and if first group already has checked action,
            // and second group also has a checked action, uncheck action from second group
            for (auto action : actions)
            {
                pNextItem->mpActionGroup->removeAction(action);

                if (pFirstCheckedAction && pSecondCheckedAction && (action == pSecondCheckedAction))
                {
                    action->setChecked(false);
                }

                pCurrentItem->mpActionGroup->addAction(action);
            }

            // now replace all pointers to second group with pointers to first group
            for (unsigned idx = nPos + 1; idx < nCount; ++idx)
            {
                QtMenuItem* pModifiedItem = GetItemAtPos(idx);

                if ((!pModifiedItem) || (!pModifiedItem->mpActionGroup))
                {
                    break;
                }

                pModifiedItem->mpActionGroup = pCurrentItem->mpActionGroup;
            }
        }
    }
}

void QtMenu::ResetAllActionGroups()
{
    for (unsigned nItem = 0; nItem < GetItemCount(); ++nItem)
    {
        QtMenuItem* pSalMenuItem = GetItemAtPos(nItem);
        pSalMenuItem->mpActionGroup.reset();
    }
}

void QtMenu::UpdateActionGroupItem(const QtMenuItem* pSalMenuItem)
{
    SolarMutexGuard g;
    GetQtInstance().RunInMainThread([&] {
        QAction* pAction = pSalMenuItem->getAction();
        if (!pAction)
            return;

        bool bChecked = mpVCLMenu->IsItemChecked(pSalMenuItem->mnId);
        MenuItemBits itemBits = mpVCLMenu->GetItemBits(pSalMenuItem->mnId);

        if (itemBits & MenuItemBits::RADIOCHECK)
        {
            pAction->setCheckable(true);

            if (pSalMenuItem->mpActionGroup)
            {
                pSalMenuItem->mpActionGroup->addAction(pAction);
            }

            pAction->setChecked(bChecked);
        }
        else
        {
            pAction->setActionGroup(nullptr);

            if (itemBits & MenuItemBits::CHECKABLE)
            {
                pAction->setCheckable(true);
                pAction->setChecked(bChecked);
            }
            else
            {
                pAction->setChecked(false);
                pAction->setCheckable(false);
            }
        }
    });
}

void QtMenu::InsertItem(SalMenuItem* pSalMenuItem, unsigned nPos)
{
    SolarMutexGuard aGuard;
    QtMenuItem* pItem = static_cast<QtMenuItem*>(pSalMenuItem);

    if (nPos == MENU_APPEND)
        maItems.push_back(pItem);
    else
        maItems.insert(maItems.begin() + nPos, pItem);

    pItem->mpParentMenu = this;

    InsertQtMenuItem(pItem, nPos);
}

void QtMenu::RemoveItem(unsigned nPos)
{
    SolarMutexGuard g;
    GetQtInstance().RunInMainThread([&] {
        if (nPos >= maItems.size())
            return;

        QtMenuItem* pItem = maItems[nPos];
        pItem->mpAction.reset();
        pItem->mpMenu.reset();

        maItems.erase(maItems.begin() + nPos);

        // Recalculate action groups if necessary:
        // if separator between two QActionGroups was removed,
        // it may be needed to merge them
        if (nPos > 0)
        {
            ReinitializeActionGroup(nPos - 1);
        }
    });
}

void QtMenu::SetSubMenu(SalMenuItem* pSalMenuItem, SalMenu* pSubMenu, unsigned nPos)
{
    SolarMutexGuard aGuard;
    QtMenuItem* pItem = static_cast<QtMenuItem*>(pSalMenuItem);
    QtMenu* pQSubMenu = static_cast<QtMenu*>(pSubMenu);

    pItem->mpSubMenu = pQSubMenu;
    // at this point the pointer to parent menu may be outdated, update it too
    pItem->mpParentMenu = this;

    if (pQSubMenu != nullptr)
    {
        pQSubMenu->mpParentSalMenu = this;
        pQSubMenu->mpQMenu = pItem->mpMenu.get();
    }

    // if it's not a menu bar item, then convert it to corresponding item if type if necessary.
    // If submenu is present and it's an action, convert it to menu.
    // If submenu is not present and it's a menu, convert it to action.
    // It may be fine to proceed in any case, but by skipping other cases
    // amount of unneeded actions taken should be reduced.
    if (pItem->mpParentMenu->mbMenuBar || (pQSubMenu && pItem->mpMenu)
        || ((!pQSubMenu) && pItem->mpAction))
    {
        return;
    }

    InsertQtMenuItem(pItem, nPos);
}

void QtMenu::SetFrame(const SalFrame* pFrame)
{
    QtInstance& rQtInstance = GetQtInstance();
    if (!rQtInstance.IsMainThread())
    {
        rQtInstance.RunInMainThread([this, pFrame]() { SetFrame(pFrame); });
        return;
    }

    SolarMutexGuard aGuard;
    assert(mbMenuBar);
    mpFrame = const_cast<QtFrame*>(static_cast<const QtFrame*>(pFrame));

    mpFrame->SetMenu(this);

    QtMainWindow* pMainWindow = mpFrame->GetTopLevelWindow();
    if (!pMainWindow)
        return;

    mpQMenuBar = new QMenuBar();
    mpQMenuBar->installEventFilter(this);
    pMainWindow->setMenuBar(mpQMenuBar);

    // open menu bar on F10, as is common in KF 6 and other toolkits:
    // https://wordsmith.social/felix-ernst/f10-for-accessibility-in-kf6
    QShortcut* pQShortcut = new QShortcut(QKeySequence(Qt::Key_F10), mpQMenuBar->window());
    connect(pQShortcut, &QShortcut::activated, this, &QtMenu::slotShortcutF10);

    QWidget* pWidget = mpQMenuBar->cornerWidget(Qt::TopRightCorner);
    if (pWidget)
    {
        m_pButtonGroup = pWidget->findChild<QButtonGroup*>(gButtonGroupKey);
        assert(m_pButtonGroup);
        connect(m_pButtonGroup, QOverload<QAbstractButton*>::of(&QButtonGroup::buttonClicked), this,
                &QtMenu::slotMenuBarButtonClicked);
        QPushButton* pButton = static_cast<QPushButton*>(m_pButtonGroup->button(CLOSE_BUTTON_ID));
        if (pButton)
            connect(pButton, &QPushButton::clicked, this, &QtMenu::slotCloseDocument);
    }
    else
        m_pButtonGroup = nullptr;
    mpQMenu = nullptr;

    DoFullMenuUpdate(mpVCLMenu);
}

void QtMenu::DoFullMenuUpdate(Menu* pMenuBar)
{
    if (mpQMenuBar && ThemeColors::VclPluginCanUseThemeColors())
        mpQMenuBar->setPalette(QtCustomStyle::GetMenuBarPalette());

    if (mpQMenu && ThemeColors::VclPluginCanUseThemeColors())
        mpQMenu->setPalette(QtCustomStyle::GetMenuPalette());

    // clear action groups since menu is rebuilt
    ResetAllActionGroups();
    ShowCloseButton(false);

    for (sal_Int32 nItem = 0; nItem < static_cast<sal_Int32>(GetItemCount()); nItem++)
    {
        QtMenuItem* pSalMenuItem = GetItemAtPos(nItem);
        InsertQtMenuItem(pSalMenuItem, nItem);
        SetItemImage(nItem, pSalMenuItem, pSalMenuItem->maImage);
        const bool bShowDisabled
            = bool(pMenuBar->GetMenuFlags() & MenuFlags::AlwaysShowDisabledEntries)
              || !bool(pMenuBar->GetMenuFlags() & MenuFlags::HideDisabledEntries);
        const bool bVisible = pSalMenuItem->mbVisible
                              && (bShowDisabled || mpVCLMenu->IsItemEnabled(pSalMenuItem->mnId));
        pSalMenuItem->getAction()->setVisible(bVisible);

        if (pSalMenuItem->mpSubMenu != nullptr)
        {
            pMenuBar->HandleMenuActivateEvent(pSalMenuItem->mpSubMenu->GetMenu());
            pSalMenuItem->mpSubMenu->DoFullMenuUpdate(pMenuBar);
            pMenuBar->HandleMenuDeActivateEvent(pSalMenuItem->mpSubMenu->GetMenu());
        }
    }
}

void QtMenu::ShowItem(unsigned nPos, bool bShow)
{
    SolarMutexGuard g;
    GetQtInstance().RunInMainThread([&] {
        if (nPos < maItems.size())
        {
            QtMenuItem* pSalMenuItem = GetItemAtPos(nPos);
            QAction* pAction = pSalMenuItem->getAction();
            if (pAction)
                pAction->setVisible(bShow);
            pSalMenuItem->mbVisible = bShow;
        }
    });
}

void QtMenu::SetItemBits(unsigned nPos, MenuItemBits)
{
    if (nPos < maItems.size())
    {
        QtMenuItem* pSalMenuItem = GetItemAtPos(nPos);
        UpdateActionGroupItem(pSalMenuItem);
    }
}

void QtMenu::CheckItem(unsigned nPos, bool bChecked)
{
    SolarMutexGuard g;
    GetQtInstance().RunInMainThread([&] {
        if (nPos < maItems.size())
        {
            QtMenuItem* pSalMenuItem = GetItemAtPos(nPos);
            QAction* pAction = pSalMenuItem->getAction();
            if (pAction)
            {
                pAction->setCheckable(true);
                pAction->setChecked(bChecked);
            }
        }
    });
}

void QtMenu::EnableItem(unsigned nPos, bool bEnable)
{
    SolarMutexGuard g;
    GetQtInstance().RunInMainThread([&] {
        if (nPos < maItems.size())
        {
            QtMenuItem* pSalMenuItem = GetItemAtPos(nPos);
            QAction* pAction = pSalMenuItem->getAction();
            if (pAction)
                pAction->setEnabled(bEnable);
            pSalMenuItem->mbEnabled = bEnable;
        }
    });
}

void QtMenu::SetItemText(unsigned, SalMenuItem* pItem, const OUString& rText)
{
    SolarMutexGuard g;
    GetQtInstance().RunInMainThread([&] {
        QtMenuItem* pSalMenuItem = static_cast<QtMenuItem*>(pItem);
        QAction* pAction = pSalMenuItem->getAction();
        if (pAction)
            pAction->setText(vclToQtStringWithAccelerator(rText));
    });
}

void QtMenu::SetItemImage(unsigned, SalMenuItem* pItem, const Image& rImage)
{
    SolarMutexGuard g;
    GetQtInstance().RunInMainThread([&] {
        QtMenuItem* pSalMenuItem = static_cast<QtMenuItem*>(pItem);

        // Save new image to use it in DoFullMenuUpdate
        pSalMenuItem->maImage = rImage;

        QAction* pAction = pSalMenuItem->getAction();
        if (!pAction)
            return;

        pAction->setIcon(QPixmap::fromImage(toQImage(rImage)));
    });
}

void QtMenu::SetItemTooltip(SalMenuItem* pItem, const OUString& rTooltip)
{
    SolarMutexGuard g;
    GetQtInstance().RunInMainThread([&] {
        QtMenuItem* pSalMenuItem = static_cast<QtMenuItem*>(pItem);

        if (QAction* pAction = pSalMenuItem->getAction())
            pAction->setToolTip(toQString(rTooltip));
    });
}

void QtMenu::SetAccelerator(unsigned, SalMenuItem* pItem, const vcl::KeyCode&,
                            const OUString& rText)
{
    SolarMutexGuard g;
    GetQtInstance().RunInMainThread([&] {
        QtMenuItem* pSalMenuItem = static_cast<QtMenuItem*>(pItem);
        QAction* pAction = pSalMenuItem->getAction();
        if (pAction)
            pAction->setShortcut(QKeySequence(toQString(rText), QKeySequence::PortableText));
    });
}

QtMenu* QtMenu::GetTopLevel()
{
    QtMenu* pMenu = this;
    while (pMenu->mpParentSalMenu)
        pMenu = pMenu->mpParentSalMenu;
    return pMenu;
}

bool QtMenu::validateQMenuBar() const
{
    if (!mpQMenuBar)
        return false;
    assert(mpFrame);
    QtMainWindow* pMainWindow = mpFrame->GetTopLevelWindow();
    assert(pMainWindow);
    const bool bValid = mpQMenuBar == pMainWindow->menuBar();
    if (!bValid)
    {
        QtMenu* thisPtr = const_cast<QtMenu*>(this);
        thisPtr->mpQMenuBar = nullptr;
    }
    return bValid;
}

void QtMenu::ShowMenuBar(bool bVisible)
{
    SolarMutexGuard g;
    GetQtInstance().RunInMainThread([&] {
        if (!validateQMenuBar())
            return;

        mpQMenuBar->setVisible(bVisible);
        if (bVisible)
            lcl_force_menubar_layout_update(*mpQMenuBar);
    });
}

void QtMenu::slotMenuHovered(QtMenuItem* pItem)
{
    const OUString sHelpId = pItem->mpParentMenu->GetMenu()->GetHelpId(pItem->mnId);
    m_sCurrentHelpId = sHelpId;
}

void QtMenu::slotShowHelp()
{
    SolarMutexGuard aGuard;
    Help* pHelp = Application::GetHelp();
    if (pHelp && !m_sCurrentHelpId.isEmpty())
    {
        pHelp->Start(m_sCurrentHelpId);
    }
}

void QtMenu::slotMenuTriggered(QtMenuItem* pQItem)
{
    if (!pQItem)
        return;

    QtMenu* pSalMenu = pQItem->mpParentMenu;
    QtMenu* pTopLevel = pSalMenu->GetTopLevel();

    Menu* pMenu = pSalMenu->GetMenu();
    auto mnId = pQItem->mnId;

    // HACK to allow HandleMenuCommandEvent to "not-set" the checked button
    // LO expects a signal before an item state change, so reset the check item
    if (pQItem->mpAction->isCheckable()
        && (!pQItem->mpActionGroup || pQItem->mpActionGroup->actions().size() <= 1))
        pQItem->mpAction->setChecked(!pQItem->mpAction->isChecked());
    pTopLevel->GetMenu()->HandleMenuCommandEvent(pMenu, mnId);
}

void QtMenu::slotMenuAboutToShow(QtMenuItem* pQItem)
{
    if (pQItem)
    {
        QtMenu* pSalMenu = pQItem->mpSubMenu;
        QtMenu* pTopLevel = pSalMenu->GetTopLevel();

        Menu* pMenu = pSalMenu->GetMenu();

        // following function may update the menu
        pTopLevel->GetMenu()->HandleMenuActivateEvent(pMenu);
    }
}

void QtMenu::slotMenuAboutToHide(QtMenuItem* pQItem)
{
    if (pQItem)
    {
        QtMenu* pSalMenu = pQItem->mpSubMenu;
        QtMenu* pTopLevel = pSalMenu->GetTopLevel();

        Menu* pMenu = pSalMenu->GetMenu();

        pTopLevel->GetMenu()->HandleMenuDeActivateEvent(pMenu);
    }
}

void QtMenu::slotCloseDocument()
{
    MenuBar* pVclMenuBar = static_cast<MenuBar*>(mpVCLMenu.get());
    if (pVclMenuBar)
        Application::PostUserEvent(pVclMenuBar->GetCloseButtonClickHdl());
}

void QtMenu::slotMenuBarButtonClicked(QAbstractButton* pButton)
{
    MenuBar* pVclMenuBar = static_cast<MenuBar*>(mpVCLMenu.get());
    if (pVclMenuBar)
    {
        SolarMutexGuard aGuard;
        pVclMenuBar->HandleMenuButtonEvent(m_pButtonGroup->id(pButton));
    }
}

void QtMenu::slotShortcutF10()
{
    SolarMutexGuard aGuard;

    // focus menu bar and select first item
    if (mpQMenuBar && !mpQMenuBar->actions().empty())
        mpQMenuBar->setActiveAction(mpQMenuBar->actions().at(0));
}

QPushButton* QtMenu::ImplAddMenuBarButton(const QIcon& rIcon, const QString& rToolTip, int nId)
{
    if (!validateQMenuBar())
        return nullptr;

    QWidget* pWidget = mpQMenuBar->cornerWidget(Qt::TopRightCorner);
    QHBoxLayout* pLayout;
    if (!pWidget)
    {
        assert(!m_pButtonGroup);
        pWidget = GetQtInstance().EmscriptenLightweightRunInMainThread(
            [this] { return new QWidget(mpQMenuBar); });
        assert(!pWidget->layout());
        pLayout = GetQtInstance().EmscriptenLightweightRunInMainThread(
            [] { return new QHBoxLayout(); });
        pLayout->setContentsMargins(QMargins());
        pLayout->setSpacing(0);
        pWidget->setLayout(pLayout);
        m_pButtonGroup = GetQtInstance().EmscriptenLightweightRunInMainThread(
            [pLayout] { return new QButtonGroup(pLayout); });
        m_pButtonGroup->setObjectName(gButtonGroupKey);
        m_pButtonGroup->setExclusive(false);
        connect(m_pButtonGroup, QOverload<QAbstractButton*>::of(&QButtonGroup::buttonClicked), this,
                &QtMenu::slotMenuBarButtonClicked);
        GetQtInstance().EmscriptenLightweightRunInMainThread([this, pWidget] {
            pWidget->show();
            mpQMenuBar->setCornerWidget(pWidget, Qt::TopRightCorner);
        });
    }
    else
        pLayout = static_cast<QHBoxLayout*>(pWidget->layout());
    assert(m_pButtonGroup);
    assert(pLayout);

    QPushButton* pButton = static_cast<QPushButton*>(m_pButtonGroup->button(nId));
    if (pButton)
        RemoveMenuBarButton(nId);

    pButton
        = GetQtInstance().EmscriptenLightweightRunInMainThread([] { return new QPushButton(); });
    // we don't want the button to increase the QMenuBar height, so a fixed size square it is
    const int nFixedLength
        = mpQMenuBar->height() - 2 * mpQMenuBar->style()->pixelMetric(QStyle::PM_MenuBarVMargin);
    pButton->setFixedSize(nFixedLength, nFixedLength);
    pButton->setIcon(rIcon);
    pButton->setFlat(true);
    pButton->setFocusPolicy(Qt::NoFocus);
    pButton->setToolTip(rToolTip);

    m_pButtonGroup->addButton(pButton, nId);
    int nPos = pLayout->count();
    if (m_pButtonGroup->button(CLOSE_BUTTON_ID))
        nPos--;
    pLayout->insertWidget(nPos, pButton, 0, Qt::AlignCenter);
    // show must happen after adding the button to the layout, otherwise the button is
    // shown, but not correct in the layout, if at all! Some times the layout ignores it.
    pButton->show();

    lcl_force_menubar_layout_update(*mpQMenuBar);

    return pButton;
}

bool QtMenu::AddMenuBarButton(const SalMenuButtonItem& rItem)
{
    if (!validateQMenuBar())
        return false;
    return !!ImplAddMenuBarButton(QIcon(QPixmap::fromImage(toQImage(rItem.maImage))),
                                  toQString(rItem.maToolTipText), rItem.mnId);
}

void QtMenu::connectHelpShortcut(QMenu* pMenu)
{
    assert(pMenu);
    QKeySequence sequence(QKeySequence::HelpContents);
    QShortcut* pQShortcut;
    pQShortcut = GetQtInstance().EmscriptenLightweightRunInMainThread(
        [&sequence, pMenu] { return new QShortcut(sequence, pMenu); });
    connect(pQShortcut, &QShortcut::activated, this, QtMenu::slotShowHelp);
    connect(pQShortcut, &QShortcut::activatedAmbiguously, this, QtMenu::slotShowHelp);
}

void QtMenu::connectHelpSignalSlots(QMenu* pMenu, QtMenuItem* pSalMenuItem)
{
    // connect hovered signal of the menu's own action
    QAction* pAction = pMenu->menuAction();
    assert(pAction);
    connect(pAction, &QAction::hovered, this, [pSalMenuItem] { slotMenuHovered(pSalMenuItem); });

    // connect slot to handle Help key (F1)
    connectHelpShortcut(pMenu);

    // enable tooltips, Qt doesn't show them for menu entries by default
    pMenu->setToolTipsVisible(true);
}

void QtMenu::RemoveMenuBarButton(sal_uInt16 nId)
{
    SolarMutexGuard g;
    GetQtInstance().RunInMainThread([&] {
        if (!validateQMenuBar())
            return;

        assert(m_pButtonGroup);
        auto* pButton = m_pButtonGroup->button(nId);
        assert(pButton);
        QWidget* pWidget = mpQMenuBar->cornerWidget(Qt::TopRightCorner);
        assert(pWidget);
        QLayout* pLayout = pWidget->layout();
        m_pButtonGroup->removeButton(pButton);
        pLayout->removeWidget(pButton);
        delete pButton;

        lcl_force_menubar_layout_update(*mpQMenuBar);
    });
}

tools::Rectangle QtMenu::GetMenuBarButtonRectPixel(sal_uInt16 nId, SalFrame* pFrame)
{
#ifdef NDEBUG
    Q_UNUSED(pFrame);
#endif
    if (!validateQMenuBar())
        return tools::Rectangle();

    assert(mpFrame == static_cast<QtFrame*>(pFrame));
    assert(m_pButtonGroup);
    auto* pButton = static_cast<QPushButton*>(m_pButtonGroup->button(nId));
    assert(pButton);

    // unfortunatly, calling lcl_force_menubar_layout_update results in a temporary wrong menubar size,
    // but it's the correct minimal size AFAIK and the layout seems correct, so just adjust the width.
    QPoint aPos = pButton->mapTo(mpFrame->asChild(), QPoint());
    aPos.rx() += (mpFrame->asChild()->width() - mpQMenuBar->width());
    return tools::Rectangle(toPoint(aPos), toSize(pButton->size()));
}

void QtMenu::ShowCloseButton(bool bShow)
{
    SolarMutexGuard g;
    GetQtInstance().RunInMainThread([&] {
        if (!validateQMenuBar())
            return;

        if (!bShow && !m_pButtonGroup)
            return;

        QPushButton* pButton = nullptr;
        if (m_pButtonGroup)
            pButton = static_cast<QPushButton*>(m_pButtonGroup->button(CLOSE_BUTTON_ID));
        if (!bShow && !pButton)
            return;

        if (!pButton)
        {
            QIcon aIcon;
            if (QIcon::hasThemeIcon("window-close-symbolic"))
                aIcon = QIcon::fromTheme("window-close-symbolic");
            else
                aIcon = QIcon(
                    QPixmap::fromImage(toQImage(Image(StockImage::Yes, SV_RESID_BITMAP_CLOSEDOC))));
            pButton = ImplAddMenuBarButton(aIcon, toQString(VclResId(SV_HELPTEXT_CLOSEDOCUMENT)),
                                           CLOSE_BUTTON_ID);
            connect(pButton, &QPushButton::clicked, this, &QtMenu::slotCloseDocument);
        }

        if (bShow)
            pButton->show();
        else
            pButton->hide();

        lcl_force_menubar_layout_update(*mpQMenuBar);
    });
}

bool QtMenu::ShowNativePopupMenu(FloatingWindow* pWin, const tools::Rectangle& rRect,
                                 FloatWinPopupFlags nFlags)
{
    assert(mpQMenu);
    DoFullMenuUpdate(mpVCLMenu);
    mpQMenu->setTearOffEnabled(bool(nFlags & FloatWinPopupFlags::AllowTearOff));

    const VclPtr<vcl::Window> xParent = pWin->ImplGetWindowImpl()->mpRealParent;
    AbsoluteScreenPixelRectangle aFloatRect = FloatingWindow::ImplConvertToAbsPos(xParent, rRect);

    QtFrame* pFrame = static_cast<QtFrame*>(pWin->ImplGetFrame());
    assert(pFrame);

    const QRect aRect = toQRect(aFloatRect, 1 / pFrame->devicePixelRatioF());
    mpQMenu->exec(aRect.bottomLeft());

    return true;
}

int QtMenu::GetMenuBarHeight() const
{
    if (!validateQMenuBar() || mpQMenuBar->isHidden())
        return 0;

    return mpQMenuBar->height();
}

QtMenu::~QtMenu()
{
    SolarMutexGuard g;
    GetQtInstance().RunInMainThread([&] { mpOwnedQMenu.reset(); });
}

QtMenuItem::QtMenuItem(const SalItemParams* pItemData)
    : mpParentMenu(nullptr)
    , mpSubMenu(nullptr)
    , mnId(pItemData->nId)
    , mnType(pItemData->eType)
    , mbVisible(true)
    , mbEnabled(true)
    , maImage(pItemData->aImage)
{
}

QAction* QtMenuItem::getAction() const
{
    if (mpMenu)
        return mpMenu->menuAction();
    if (mpAction)
        return mpAction.get();
    return nullptr;
}

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