Qt 自定义横向多级菜单插件:不使用 QMenuBar / QMenu,完全 QWidget 化实现

#pragma once#include<QList>#include<QString>#include<QtAlgorithms>structMenuNode{    QString text;    QList<MenuNode *> children;explicitMenuNode(const QString &menuText = QString(), const QList<MenuNode *> &menuChildren = {})        : text(menuText)        , children(menuChildren)    {    }    ~MenuNode()    {qDeleteAll(children);        children.clear();    }MenuNode(const MenuNode &) = delete;    MenuNode &operator=(const MenuNode &) = delete;};

#pragma once#include <QHash>#include <QList>#include <QPointer>#include <QWidget>#include "menunode.h"classQCloseEvent;classQEnterEvent;classQEvent;classQHBoxLayout;classQMouseEvent;classQPaintEvent;classQVBoxLayout;classCustomMenuItemWidget : publicQWidget{    Q_OBJECTpublic:enumclassRole {        TopLevel,        PopupItem    };struct MenuItemLayoutMetrics    {int leftPadding;int rightPadding;int minWidth;int height;    };explicitCustomMenuItemWidget(const QString &text, Role role, bool hasChildren, QWidget *parent = nullptr);voidsetActive(bool active);voidsetHovered(bool hovered);QString text() const;signals:voiditemHovered();voiditemLeft();voiditemClicked();protected:voidenterEvent(QEnterEvent *event) override;voidleaveEvent(QEvent *event) override;voidmousePressEvent(QMouseEvent *event) override;voidmouseReleaseEvent(QMouseEvent *event) override;voidpaintEvent(QPaintEvent *event) override;QSize sizeHint() constoverride;MenuItemLayoutMetrics layoutMetrics() const;private:    QString m_text;    Role m_role;bool m_hasChildren;bool m_hovered;bool m_pressed;bool m_active;};classCustomMenuPopupWidget : publicQWidget{    Q_OBJECTpublic:explicitCustomMenuPopupWidget(const QList<MenuNode *> &items, const QStringList &parentPath, QWidget *parent = nullptr);voidpopupAt(const QPoint &globalPos);voidcloseTree();boolcontainsGlobalPosInTree(const QPoint &globalPos) const;voidsyncSubmenuForGlobalPos(const QPoint &globalPos);signals:voidactionTriggered(const QString &path);voidpopupClosed();voidpopupLeft();protected:voidcloseEvent(QCloseEvent *event) override;voidenterEvent(QEnterEvent *event) override;voidleaveEvent(QEvent *event) override;voidpaintEvent(QPaintEvent *event) override;private:voidbuildItems();voidshowChildMenu(CustomMenuItemWidget *itemWidget, MenuNode *node, const QStringList &path);voidcloseChildMenu();    QList<MenuNode *> m_items;    QStringList m_parentPath;    QVBoxLayout *m_layout;    QPointer<CustomMenuPopupWidget> m_childPopup;    QPointer<CustomMenuItemWidget> m_childAnchorItem;    QHash<CustomMenuItemWidget *, MenuNode *> m_itemNodes;};classMenuPluginCustomHorizontalWidget : publicQWidget{    Q_OBJECTpublic:struct MenuDef {        QString key;        QList<MenuDef> values = {};    };explicitMenuPluginCustomHorizontalWidget(QWidget *parent = nullptr);    ~MenuPluginCustomHorizontalWidget() override;voidsetMenus(const QList<MenuDef> &menus);signals:voidactionTriggered(const QString &path);protected:booleventFilter(QObject *watched, QEvent *event) override;private:    QList<MenuNode *> buildMenusFromDef(const QList<MenuDef> &defs) const;voidrebuildMenus();voidclearLayout();voidclearMenuData();voidshowRootMenu(CustomMenuItemWidget *itemWidget, MenuNode *node);voidclearActiveTopItem();boolcontainsGlobalPosInActiveChain(const QPoint &globalPos) const;boolcontainsGlobalPosInAnyTopItem(const QPoint &globalPos) const;voidcloseRootPopup();voidinstallApplicationEventFilter();voidremoveApplicationEventFilter();    CustomMenuItemWidget *topItemAtGlobalPos(const QPoint &globalPos) const;    MenuNode *nodeForTopItem(CustomMenuItemWidget *itemWidget) const;    QList<MenuNode *> m_menus;    QHBoxLayout *m_layout;    QHash<CustomMenuItemWidget *, MenuNode *> m_topItemNodes;    QPointer<CustomMenuPopupWidget> m_rootPopup;    QPointer<CustomMenuItemWidget> m_activeTopItem;bool m_applicationEventFilterInstalled;};

#include"menuplugincustomhorizontalwidget.h"#include<QApplication>#include<QCloseEvent>#include<QCursor>#include<QEnterEvent>#include<QEvent>#include<QHBoxLayout>#include<QLayoutItem>#include<QMouseEvent>#include<QPainter>#include<QPainterPath>#include<QStyleFactory>#include<QTimer>#include<QVBoxLayout>namespace{QString joinPath(const QStringList &parts){return parts.join(QStringLiteral(" / "));}QColor topTextColor(bool active){return active ? QColor(QStringLiteral("#1d4ed8")) : QColor(QStringLiteral("#334155"));}QRect bridgeRectBetween(const QRect &first, const QRect &second){if (first.isNull() || second.isNull()) {return {};    }return first.united(second).adjusted(-8, -8, 8, 8);}}CustomMenuItemWidget::CustomMenuItemWidget(const QString &text, Role role, bool hasChildren, QWidget *parent)    : QWidget(parent)    , m_text(text)    , m_role(role)    , m_hasChildren(hasChildren)    , m_hovered(false)    , m_pressed(false)    , m_active(false){setMouseTracking(true);setCursor(Qt::PointingHandCursor);setFocusPolicy(Qt::NoFocus);}voidCustomMenuItemWidget::setActive(bool active){if (m_active == active) {return;    }    m_active = active;update();}voidCustomMenuItemWidget::setHovered(bool hovered){if (m_hovered == hovered) {return;    }    m_hovered = hovered;update();}QString CustomMenuItemWidget::text()const{return m_text;}voidCustomMenuItemWidget::enterEvent(QEnterEvent *event){    QWidget::enterEvent(event);    m_hovered = true;emit itemHovered();update();}voidCustomMenuItemWidget::leaveEvent(QEvent *event){    QWidget::leaveEvent(event);    m_hovered = false;    m_pressed = false;emit itemLeft();update();}voidCustomMenuItemWidget::mousePressEvent(QMouseEvent *event){if (event->button() == Qt::LeftButton) {        m_pressed = true;update();    }    QWidget::mousePressEvent(event);}voidCustomMenuItemWidget::mouseReleaseEvent(QMouseEvent *event){if (event->button() == Qt::LeftButton && rect().contains(event->pos())) {emit itemClicked();    }    m_pressed = false;update();    QWidget::mouseReleaseEvent(event);}voidCustomMenuItemWidget::paintEvent(QPaintEvent *event){Q_UNUSED(event);QPainter painter(this);    painter.setRenderHint(QPainter::Antialiasing, true);const QRectF bgRect = rect().adjusted(2.0, 2.0, -2.0, -2.0);constbool highlighted = m_active || m_pressed || m_hovered;constbool useActiveBackground = m_role == Role::TopLevel && (m_pressed || m_active);const QColor background = highlighted        ? (useActiveBackground ? QColor(QStringLiteral("#dbeafe")) : QColor(QStringLiteral("#eef2f7")))        : QColor(Qt::transparent);if (highlighted) {        QPainterPath path;        path.addRoundedRect(bgRect, 8.0, 8.0);        painter.fillPath(path, background);    }    QFont menuFont = font();    menuFont.setPointSize(10);    menuFont.setWeight(QFont::DemiBold);    painter.setFont(menuFont);    painter.setPen(m_role == Role::TopLevel ? topTextColor(highlighted) : QColor(QStringLiteral("#334155")));constauto metrics = layoutMetrics();    QRect textRect = rect().adjusted(metrics.leftPadding, 0, -metrics.rightPadding, 0);QFontMetrics fm(menuFont);const QString text = fm.elidedText(m_text, Qt::ElideRight, textRect.width());    painter.drawText(textRect, Qt::AlignVCenter | Qt::AlignLeft, text);if (m_hasChildren && m_role == Role::PopupItem) {        QPolygonF arrow;const qreal centerY = rect().center().y();const qreal right = rect().right() - 14.0;        arrow << QPointF(right, centerY - 4.0)              << QPointF(right + 5.0, centerY)              << QPointF(right, centerY + 4.0);        painter.setBrush(QColor(QStringLiteral("#334155")));        painter.setPen(Qt::NoPen);        painter.drawPolygon(arrow);    }}QSize CustomMenuItemWidget::sizeHint()const{    QFont menuFont = font();    menuFont.setPointSize(10);    menuFont.setWeight(QFont::DemiBold);const QFontMetrics fm(menuFont);constauto metrics = layoutMetrics();constint reserve = 8;constint width = fm.horizontalAdvance(m_text) + metrics.leftPadding + metrics.rightPadding + reserve;returnQSize(qMax(metrics.minWidth, width), metrics.height);}CustomMenuItemWidget::MenuItemLayoutMetrics CustomMenuItemWidget::layoutMetrics()const{if (m_role == Role::TopLevel) {return {14, m_hasChildren ? 28 : 12, 72, 40};    }return {12, m_hasChildren ? 28 : 12, 180, 36};}CustomMenuPopupWidget::CustomMenuPopupWidget(const QList<MenuNode *> &items, const QStringList &parentPath, QWidget *parent)    : QWidget(parent, Qt::Popup | Qt::FramelessWindowHint)    , m_items(items)    , m_parentPath(parentPath)    , m_layout(newQVBoxLayout(this)){setAttribute(Qt::WA_TranslucentBackground, true);setAttribute(Qt::WA_NoSystemBackground, true);setMouseTracking(true);setWindowFlag(Qt::FramelessWindowHint, true);setWindowFlag(Qt::NoDropShadowWindowHint, true);setStyle(QStyleFactory::create(QStringLiteral("Fusion")));    m_layout->setContentsMargins(8, 8, 8, 8);    m_layout->setSpacing(2);buildItems();}voidCustomMenuPopupWidget::popupAt(const QPoint &globalPos){adjustSize();move(globalPos);show();raise();}voidCustomMenuPopupWidget::closeTree(){closeChildMenu();close();}voidCustomMenuPopupWidget::closeEvent(QCloseEvent *event){closeChildMenu();emit popupClosed();    QWidget::closeEvent(event);}voidCustomMenuPopupWidget::enterEvent(QEnterEvent *event){    QWidget::enterEvent(event);}voidCustomMenuPopupWidget::leaveEvent(QEvent *event){    QWidget::leaveEvent(event);emit popupLeft();}voidCustomMenuPopupWidget::paintEvent(QPaintEvent *event){Q_UNUSED(event);QPainter painter(this);    painter.setRenderHint(QPainter::Antialiasing, true);    painter.setCompositionMode(QPainter::CompositionMode_Source);    painter.fillRect(rect(), Qt::transparent);    painter.setCompositionMode(QPainter::CompositionMode_SourceOver);const QRectF panelRect = rect().adjusted(1.0, 1.0, -1.0, -1.0);    QPainterPath path;    path.addRoundedRect(panelRect, 12.0, 12.0);    painter.fillPath(path, QColor(QStringLiteral("#ffffffff")));    painter.setPen(QPen(QColor(QStringLiteral("#dbe2ea")), 1.0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));    painter.drawPath(path);}voidCustomMenuPopupWidget::buildItems(){for (MenuNode *node : m_items) {if (node == nullptr || node->text.isEmpty()) {continue;        }const QStringList currentPath = m_parentPath + QStringList{node->text};auto *itemWidget = newCustomMenuItemWidget(            node->text,            CustomMenuItemWidget::Role::PopupItem,            !node->children.isEmpty(),this);        m_layout->addWidget(itemWidget);        m_itemNodes.insert(itemWidget, node);connect(itemWidget, &CustomMenuItemWidget::itemHovered, this, [this, itemWidget, node, currentPath]() {if (node->children.isEmpty()) {closeChildMenu();return;            }showChildMenu(itemWidget, node, currentPath);        });connect(itemWidget, &CustomMenuItemWidget::itemClicked, this, [this, node, currentPath]() {if (!node->children.isEmpty()) {return;            }            emit actionTriggered(joinPath(currentPath));closeTree();        });    }}voidCustomMenuPopupWidget::showChildMenu(CustomMenuItemWidget *itemWidget, MenuNode *node, const QStringList &path){if (m_childAnchorItem == itemWidget && m_childPopup != nullptr && m_childPopup->isVisible()) {        itemWidget->setActive(true);return;    }closeChildMenu();    m_childAnchorItem = itemWidget;    m_childAnchorItem->setActive(true);    m_childPopup = newCustomMenuPopupWidget(node->children, path, this);connect(m_childPopup, &CustomMenuPopupWidget::actionTriggered, this, [this](const QString &triggerPath) {        emit actionTriggered(triggerPath);closeTree();    });connect(m_childPopup, &CustomMenuPopupWidget::popupLeft, this, &CustomMenuPopupWidget::popupLeft);const QPoint globalPos = itemWidget->mapToGlobal(QPoint(itemWidget->width() - 2, 0));    m_childPopup->popupAt(globalPos);}voidCustomMenuPopupWidget::closeChildMenu(){if (m_childPopup != nullptr) {        m_childPopup->closeTree();        m_childPopup->deleteLater();        m_childPopup.clear();    }if (m_childAnchorItem != nullptr) {        m_childAnchorItem->setActive(false);    }    m_childAnchorItem.clear();}boolCustomMenuPopupWidget::containsGlobalPosInTree(const QPoint &globalPos)const{if (!isVisible()) {returnfalse;    }const QRect popupRect(mapToGlobal(QPoint(0, 0)), size());if (popupRect.contains(globalPos)) {returntrue;    }if (m_childPopup != nullptr && m_childAnchorItem != nullptr && m_childPopup->isVisible()) {const QRect anchorRect(m_childAnchorItem->mapToGlobal(QPoint(0, 0)), m_childAnchorItem->size());const QRect childRect(m_childPopup->mapToGlobal(QPoint(0, 0)), m_childPopup->size());if (bridgeRectBetween(anchorRect, childRect).contains(globalPos)) {returntrue;        }    }return m_childPopup != nullptr && m_childPopup->containsGlobalPosInTree(globalPos);}voidCustomMenuPopupWidget::syncSubmenuForGlobalPos(const QPoint &globalPos){if (!isVisible()) {return;    }if (m_childPopup != nullptr && m_childPopup->containsGlobalPosInTree(globalPos)) {        m_childPopup->syncSubmenuForGlobalPos(globalPos);return;    }const QRect popupRect(mapToGlobal(QPoint(0, 0)), size());if (!popupRect.contains(globalPos)) {closeChildMenu();return;    }    CustomMenuItemWidget *hoveredItem = nullptr;    MenuNode *hoveredNode = nullptr;for (auto it = m_itemNodes.constBegin(); it != m_itemNodes.constEnd(); ++it) {        CustomMenuItemWidget *itemWidget = it.key();        MenuNode *node = it.value();if (itemWidget == nullptr || node == nullptr) {continue;        }const QRect itemRect(itemWidget->mapToGlobal(QPoint(0, 0)), itemWidget->size());constbool containsCursor = itemRect.contains(globalPos);        itemWidget->setHovered(containsCursor);if (containsCursor) {            hoveredItem = itemWidget;            hoveredNode = node;        }    }if (hoveredItem == nullptr || hoveredNode == nullptr) {closeChildMenu();return;    }if (hoveredNode->children.isEmpty()) {closeChildMenu();return;    }showChildMenu(hoveredItem, hoveredNode, m_parentPath + QStringList{hoveredNode->text});}MenuPluginCustomHorizontalWidget::MenuPluginCustomHorizontalWidget(QWidget *parent)    : QWidget(parent)    , m_layout(newQHBoxLayout(this))    , m_applicationEventFilterInstalled(false){    m_layout->setContentsMargins(8, 4, 8, 4);    m_layout->setSpacing(6);    m_layout->addStretch();setAutoFillBackground(false);}MenuPluginCustomHorizontalWidget::~MenuPluginCustomHorizontalWidget(){removeApplicationEventFilter();clearMenuData();}voidMenuPluginCustomHorizontalWidget::setMenus(const QList<MenuDef> &menus){clearMenuData();    m_menus = buildMenusFromDef(menus);rebuildMenus();}QList<MenuNode *> MenuPluginCustomHorizontalWidget::buildMenusFromDef(const QList<MenuDef> &defs)const{    QList<MenuNode *> nodes;for (const MenuDef &def : defs) {        nodes.append(newMenuNode(def.key, buildMenusFromDef(def.values)));    }return nodes;}voidMenuPluginCustomHorizontalWidget::rebuildMenus(){clearLayout();for (MenuNode *node : m_menus) {if (node == nullptr || node->text.isEmpty()) {continue;        }auto *itemWidget = newCustomMenuItemWidget(            node->text,            CustomMenuItemWidget::Role::TopLevel,            !node->children.isEmpty(),this);        m_layout->addWidget(itemWidget);        m_topItemNodes.insert(itemWidget, node);connect(itemWidget, &CustomMenuItemWidget::itemHovered, this, [this, itemWidget, node]() {if (node == nullptr || node->children.isEmpty()) {closeRootPopup();                itemWidget->setHovered(true);return;            }showRootMenu(itemWidget, node);        });connect(itemWidget, &CustomMenuItemWidget::itemLeft, this, [this]() {            QTimer::singleShot(120, this, [this]() {const QPoint cursorPos = QCursor::pos();if (!containsGlobalPosInActiveChain(cursorPos) && !containsGlobalPosInAnyTopItem(cursorPos)) {closeRootPopup();                }            });        });connect(itemWidget, &CustomMenuItemWidget::itemClicked, this, [this, itemWidget, node]() {if (node != nullptr && node->children.isEmpty()) {                emit actionTriggered(node->text);closeRootPopup();return;            }showRootMenu(itemWidget, node);        });    }    m_layout->addStretch();}voidMenuPluginCustomHorizontalWidget::clearLayout(){closeRootPopup();clearActiveTopItem();    m_topItemNodes.clear();while (QLayoutItem *item = m_layout->takeAt(0)) {if (QWidget *widget = item->widget()) {delete widget;        }delete item;    }}voidMenuPluginCustomHorizontalWidget::clearMenuData(){clearLayout();qDeleteAll(m_menus);    m_menus.clear();}voidMenuPluginCustomHorizontalWidget::showRootMenu(CustomMenuItemWidget *itemWidget, MenuNode *node){if (itemWidget == nullptr || node == nullptr) {return;    }if (m_activeTopItem == itemWidget && m_rootPopup != nullptr && m_rootPopup->isVisible()) {return;    }clearActiveTopItem();if (node->children.isEmpty()) {closeRootPopup();return;    }closeRootPopup();    itemWidget->setActive(true);    m_activeTopItem = itemWidget;    m_rootPopup = newCustomMenuPopupWidget(node->children, {node->text}, this);const QPointer<CustomMenuPopupWidget> popup = m_rootPopup;connect(m_rootPopup, &CustomMenuPopupWidget::actionTriggered, this, &MenuPluginCustomHorizontalWidget::actionTriggered);connect(m_rootPopup, &CustomMenuPopupWidget::popupClosed, this, [this, popup]() {if (m_rootPopup == popup) {clearActiveTopItem();removeApplicationEventFilter();        }    });connect(m_rootPopup, &CustomMenuPopupWidget::popupLeft, this, [this]() {        QTimer::singleShot(120, this, [this]() {const QPoint cursorPos = QCursor::pos();if (!containsGlobalPosInActiveChain(cursorPos) && !containsGlobalPosInAnyTopItem(cursorPos)) {closeRootPopup();            }        });    });connect(m_rootPopup, &QObject::destroyed, this, [this, popup]() {if (m_rootPopup == popup) {clearActiveTopItem();            m_rootPopup.clear();removeApplicationEventFilter();        }    });    m_rootPopup->popupAt(itemWidget->mapToGlobal(QPoint(0, itemWidget->height() + 2)));installApplicationEventFilter();}voidMenuPluginCustomHorizontalWidget::clearActiveTopItem(){if (m_activeTopItem != nullptr) {        m_activeTopItem->setActive(false);        m_activeTopItem.clear();    }}boolMenuPluginCustomHorizontalWidget::containsGlobalPosInActiveChain(const QPoint &globalPos)const{if (m_activeTopItem != nullptr) {const QRect topItemRect(m_activeTopItem->mapToGlobal(QPoint(0, 0)), m_activeTopItem->size());if (topItemRect.contains(globalPos)) {returntrue;        }if (m_rootPopup != nullptr && m_rootPopup->isVisible()) {const QRect rootPopupRect(m_rootPopup->mapToGlobal(QPoint(0, 0)), m_rootPopup->size());if (bridgeRectBetween(topItemRect, rootPopupRect).contains(globalPos)) {returntrue;            }        }    }return m_rootPopup != nullptr && m_rootPopup->containsGlobalPosInTree(globalPos);}boolMenuPluginCustomHorizontalWidget::containsGlobalPosInAnyTopItem(const QPoint &globalPos)const{returntopItemAtGlobalPos(globalPos) != nullptr;}CustomMenuItemWidget *MenuPluginCustomHorizontalWidget::topItemAtGlobalPos(const QPoint &globalPos)const{for (auto it = m_topItemNodes.constBegin(); it != m_topItemNodes.constEnd(); ++it) {        CustomMenuItemWidget *topItem = it.key();if (topItem == nullptr || !topItem->isVisible()) {continue;        }const QRect topItemRect(topItem->mapToGlobal(QPoint(0, 0)), topItem->size());if (topItemRect.contains(globalPos)) {return topItem;        }    }returnnullptr;}MenuNode *MenuPluginCustomHorizontalWidget::nodeForTopItem(CustomMenuItemWidget *itemWidget)const{return m_topItemNodes.value(itemWidget, nullptr);}voidMenuPluginCustomHorizontalWidget::closeRootPopup(){if (m_rootPopup != nullptr) {        CustomMenuPopupWidget *popup = m_rootPopup;        m_rootPopup.clear();        popup->closeTree();        popup->deleteLater();    }removeApplicationEventFilter();clearActiveTopItem();}voidMenuPluginCustomHorizontalWidget::installApplicationEventFilter(){if (m_applicationEventFilterInstalled) {return;    }    qApp->installEventFilter(this);    m_applicationEventFilterInstalled = true;}voidMenuPluginCustomHorizontalWidget::removeApplicationEventFilter(){if (!m_applicationEventFilterInstalled) {return;    }    qApp->removeEventFilter(this);    m_applicationEventFilterInstalled = false;}boolMenuPluginCustomHorizontalWidget::eventFilter(QObject *watched, QEvent *event){if (m_rootPopup == nullptr) {return QWidget::eventFilter(watched, event);    }if (event->type() == QEvent::MouseMove || event->type() == QEvent::HoverMove || event->type() == QEvent::Enter) {const QPoint cursorPos = QCursor::pos();        CustomMenuItemWidget *topItem = topItemAtGlobalPos(cursorPos);if (topItem != nullptr && topItem != m_activeTopItem) {            MenuNode *topNode = nodeForTopItem(topItem);if (topNode != nullptr && !topNode->children.isEmpty()) {showRootMenu(topItem, topNode);            } else {closeRootPopup();                topItem->setHovered(true);            }return QWidget::eventFilter(watched, event);        }if (m_rootPopup != nullptr) {            m_rootPopup->syncSubmenuForGlobalPos(cursorPos);        }if (!containsGlobalPosInActiveChain(cursorPos) && !containsGlobalPosInAnyTopItem(cursorPos)) {closeRootPopup();        }    }return QWidget::eventFilter(watched, event);}

#pragma once#include<QMainWindow>classQLabel;classMenuPluginCustomHorizontalWidget;classMainWindow3 : public QMainWindow{public:explicitMainWindow3(QWidget *parent = nullptr);private:voidbuildUi();voidhandleAction(const QString &path);static QString buildStyleSheet();    QLabel *m_currentPathLabel;    QLabel *m_exampleLabel;    MenuPluginCustomHorizontalWidget *m_menuWidget;};

#include"mainwindow3.h"#include"menuplugincustomhorizontalwidget.h"#include<QFrame>#include<QLabel>#include<QStatusBar>#include<QVBoxLayout>#include<QWidget>MainWindow3::MainWindow3(QWidget *parent)    : QMainWindow(parent)    , m_currentPathLabel(nullptr)    , m_exampleLabel(nullptr)    , m_menuWidget(nullptr){buildUi();setStyleSheet(buildStyleSheet());statusBar()->showMessage(QStringLiteral("Custom horizontal menu is ready"), 3000);}voidMainWindow3::buildUi(){resize(1080, 640);setWindowTitle(QStringLiteral("Custom Horizontal Menu Demo"));auto *centralWidget = newQWidget(this);auto *rootLayout = newQVBoxLayout(centralWidget);    rootLayout->setContentsMargins(28, 20, 28, 28);    rootLayout->setSpacing(18);auto *menuPanel = newQFrame(centralWidget);    menuPanel->setObjectName(QStringLiteral("menuPanel"));auto *menuLayout = newQVBoxLayout(menuPanel);    menuLayout->setContentsMargins(14, 10, 14, 10);    m_menuWidget = newMenuPluginCustomHorizontalWidget(menuPanel);    m_menuWidget->setMenus({        {QStringLiteral("文件"), {            {QStringLiteral("New Project")},            {QStringLiteral("Open Project")},            {QStringLiteral("Export"), {                {QStringLiteral("Export as PNG")},                {QStringLiteral("Export as PDF")},                {QStringLiteral("More Formats"), {                    {QStringLiteral("CSV Data")},                    {QStringLiteral("JSON Data")},                    {QStringLiteral("Image Assets"), {                        {QStringLiteral("Thumbnail")},                        {QStringLiteral("Full Resolution")}                    }}                }}            }},            {QStringLiteral("Exit")}        }},        {QStringLiteral("编辑"), {            {QStringLiteral("Undo")},            {QStringLiteral("Redo")},            {QStringLiteral("Preferences"), {                {QStringLiteral("Theme"), {                    {QStringLiteral("Light")},                    {QStringLiteral("Dark")}                }},                {QStringLiteral("Language"), {                    {QStringLiteral("Chinese")},                    {QStringLiteral("English")}                }}            }}        }},        {QStringLiteral("视图"), {            {QStringLiteral("Refresh View")},            {QStringLiteral("Panels"), {                {QStringLiteral("Assets Panel")},                {QStringLiteral("Properties Panel")},                {QStringLiteral("Developer Tools"), {                    {QStringLiteral("Log Console")},                    {QStringLiteral("Network Requests")}                }}            }}        }},        {QStringLiteral("帮助"), {            {QStringLiteral("Documentation")},            {QStringLiteral("Shortcuts")},            {QStringLiteral("About"), {                {QStringLiteral("Version")},                {QStringLiteral("License")}            }}        }},        {QStringLiteral("更多>>")}    });connect(m_menuWidget, &MenuPluginCustomHorizontalWidget::actionTriggered, this, &MainWindow3::handleAction);    menuLayout->addWidget(m_menuWidget);auto *contentCard = newQFrame(centralWidget);    contentCard->setObjectName(QStringLiteral("contentCard"));auto *contentLayout = newQVBoxLayout(contentCard);    contentLayout->setContentsMargins(28, 24, 28, 24);    contentLayout->setSpacing(14);auto *sectionTitle = newQLabel(QStringLiteral("Custom Menu Interaction Preview"), contentCard);    sectionTitle->setObjectName(QStringLiteral("sectionTitle"));auto *introLabel = newQLabel(QStringLiteral("This menu does not use QMenuBar or QMenu. Top-level and popup entries are custom QWidget items painted manually."),        contentCard);    introLabel->setObjectName(QStringLiteral("mutedLabel"));    introLabel->setWordWrap(true);    m_currentPathLabel = newQLabel(QStringLiteral("Current action: select a custom menu item"), contentCard);    m_currentPathLabel->setObjectName(QStringLiteral("pathLabel"));    m_currentPathLabel->setWordWrap(true);    m_exampleLabel = newQLabel(QStringLiteral("Example path: File / Export / More Formats / JSON Data"), contentCard);    m_exampleLabel->setObjectName(QStringLiteral("mutedLabel"));    m_exampleLabel->setWordWrap(true);    contentLayout->addWidget(sectionTitle);    contentLayout->addWidget(introLabel);    contentLayout->addSpacing(6);    contentLayout->addWidget(m_currentPathLabel);    contentLayout->addWidget(m_exampleLabel);    contentLayout->addStretch();    rootLayout->addWidget(menuPanel);    rootLayout->addWidget(contentCard, 1);setCentralWidget(centralWidget);}voidMainWindow3::handleAction(const QString &path){    m_currentPathLabel->setText(QStringLiteral("Current action: %1").arg(path));    m_exampleLabel->setText(QStringLiteral("Last trigger: %1").arg(path));statusBar()->showMessage(QStringLiteral("Triggered: %1").arg(path), 2500);}QString MainWindow3::buildStyleSheet(){returnQStringLiteral(R"(        QMainWindow {            background: #f4f7fb;        }        QFrame#menuPanel,        QFrame#contentCard {            background: #ffffff;            border: 1px solid #e2e8f0;            border-radius: 18px;        }        QLabel#sectionTitle {            color: #0f172a;            font-size: 24px;            font-weight: 700;        }        QLabel#pathLabel {            color: #1d4ed8;            font-size: 16px;            font-weight: 600;            background: #eff6ff;            border: 1px solid #bfdbfe;            border-radius: 12px;            padding: 12px 14px;        }        QLabel#mutedLabel {            color: #475569;            font-size: 14px;        }        QStatusBar {            background: #ffffff;            color: #475569;            border-top: 1px solid #e2e8f0;        }    )");}

{QStringLiteral("文件"), {    {QStringLiteral("New Project")},    {QStringLiteral("Export"), {        {QStringLiteral("Export as PNG")},        {QStringLiteral("Export as PDF")}    }}}}

m_menuWidget->setMenus({    {QStringLiteral("文件"), {        {QStringLiteral("New Project")},        {QStringLiteral("Export"), {            {QStringLiteral("Export as PNG")},            {QStringLiteral("Export as PDF")}        }}    }},    {QStringLiteral("更多>>")}});

connect(m_menuWidget, &MenuPluginCustomHorizontalWidget::actionTriggered,        this, &MainWindow3::handleAction);