我正在处理一个从QObject和QGraphicsItem派生的TreeViewNode类，负责创建树视图（显示一个家族树）的各个节点并将它们添加到场景中。我确保在类构造函数中包含setFlag(QGraphicsItem::ItemIsSelectable);方法，并重载了mousePressEvent，如下所示：

void TreeViewNode::mousePressEvent(QGraphicsSceneMouseEvent *event) {
    if (event->button() == Qt::LeftButton) {
        qDebug() << "Mouse pressed on node: " << m_node->getPatient()->get_Name().c_str();
        emit clicked(this);
    }
    QGraphicsItem::mousePressEvent(event);
}

单击的信号在头文件中定义为void clicked(TreeViewNode* node);，然后在MainWindow中有一个updateSelectedPatient插槽

void MainWindow::updateSelectedPatient(TreeViewNode* node) {
    selected->setSelectedPatient(node->getNode()->getPatient());
}

以及MainWindow构造函数中对应的connect语句

connect(treeView, &TreeViewNode::clicked, this, &MainWindow::updateSelectedPatient);

执行时，我在视图中看到已添加到场景中的节点，但当我单击它们时，什么也没发生（我通过调试知道，还因为setSelectedPatient（）方法更新了一个小部件，显示当前选定患者的患者信息）;看起来mousePressEvent（）根本没有被调用。。任何帮助都将非常感激，谢谢你的时间!
编辑：

//TreeViewNode.hpp
class TreeViewNode : public QObject, public QGraphicsItem {
    Q_OBJECT
    Q_INTERFACES(QGraphicsItem)

private:
    node* m_node;
    Family_tree* m_family;
    QGraphicsScene* m_scene;
    static std::set<node*> addedNodes;

protected:
    void mousePressEvent(QGraphicsSceneMouseEvent* event) override;

public:
    TreeViewNode(node* node, Family_tree* family, QGraphicsScene* scene, QGraphicsItem* parent = nullptr);
    TreeViewNode* getTreeViewNode(node* n);
    node* getNode() const;
    static void clearAddedNodes();
    void updateNode(Patient& patient);
    QRectF boundingRect() const override;
    void drawBranches(QPainter* painter);
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;

signals:
    void clicked(TreeViewNode* node);
};

//TreeViewNode.cpp
TreeViewNode::TreeViewNode(node* node, Family_tree* family, QGraphicsScene* scene, QGraphicsItem* parent) : QGraphicsItem(parent), m_node(node), m_family(family), m_scene(scene) {
    if (m_node == m_family->get_root()) {m_scene->addItem(this);}
    addedNodes.insert(m_node);
    setFlag(QGraphicsItem::ItemIsSelectable);
    qDebug() << "Scene item count: " << m_scene->items().count();

    if (m_node->getFather()) {
        auto father = m_node->getFather();
        if (addedNodes.count(father) > 0) {return;}
        TreeViewNode* fatherNode = new TreeViewNode(m_node->getFather(), family, m_scene, this);
        fatherNode->setPos(-50, -100);
    }

    if (m_node->getMother()) {
        auto mother = m_node->getMother();
        if (addedNodes.count(mother) > 0) {return;}
        TreeViewNode* motherNode = new TreeViewNode(m_node->getMother(), family, m_scene, this);
        motherNode->setPos(50, -100);
    }

    if (m_node->getSpouse()) {
        auto spouse = m_node->getSpouse();
        if (addedNodes.count(spouse) > 0) {return;}
        TreeViewNode* spouseNode = new TreeViewNode(m_node->getSpouse(), family, m_scene, this);
        spouseNode->setPos(100, 0);
    }

    int childCount = 0;
    for (auto child : m_node->getChildren()) {
        if (addedNodes.count(child) > 0) {return;}
        TreeViewNode* childNode = new TreeViewNode(child, family, m_scene, this);
        childCount++;
        double xPos, yPos;
        xPos = pos().x() + 50 + 100 * (childCount - (m_node->getChildren().size() + 1) / 2.0);
        yPos = pos().y() + 100;
        childNode->setPos(xPos, yPos);
    }
}