class CustomSysmodel : public QFileSystemModel { Q_OBJECT public: CustomSysmodel(QWidget parent = Q_NULLPTR) : QFileSystemModel(parent), m_limit(100), m_timer(new QTimer(this)), m_threadPool(new QThreadPool(this)) { connect(m_timer, &QTimer::timeout, this, &CustomSysmodel::loadMoreFiles); m_timer->setInterval(2000); } public slots: void fetchFiles(const QString &path) { emit started(); FileSystemWorker worker = new FileSystemWorker; connect(worker, &FileSystemWorker::fileFound, this, &CustomSysmodel::fileFound); connect(worker, &FileSystemWorker::finished, this, &CustomSysmodel::finished); worker->setPath(path); m_threadPool->start(worker); } private: int m_limit; QTimer *m_timer; QThreadPool *m_threadPool; }; class FileSystemWorker : public QObject, public QRunnable { Q_OBJECT public: FileSystemWorker(QObject *parent = nullptr) : QObject(parent) {} void setPath(const QString& path) { m_path = path; } void run() override { QFileInfoList files = QDir(m_path).entryInfoList(QDir::Files); foreach (const QFileInfo &fileInfo, files) { emit fileFound(fileInfo.absoluteFilePath()); } emit finished(); } signals: void started(); void finished(); void fileFound(const QString &filePath); private: QString m_path; }; 将这段代码改成多线程读取，给出完整的修改方案

以下是将该代码改成多线程读取的完整修改方案：

class CustomSysmodel : public QFileSystemModel
{
    Q_OBJECT
public:
    CustomSysmodel(QWidget *parent = nullptr)
        : QFileSystemModel(parent)
        , m_limit(100)
        , m_timer(new QTimer(this))
        , m_threadPool(new QThreadPool(this))
    {
        connect(m_timer, &QTimer::timeout, this, &CustomSysmodel::loadMoreFiles);
        m_timer->setInterval(2000);
    }

public slots:
    void fetchFiles(const QString &path)
    {
        emit started();
        FileSystemWorker *worker = new FileSystemWorker(path);
        connect(worker, &FileSystemWorker::fileFound, this, &CustomSysmodel::fileFound);
        connect(worker, &FileSystemWorker::finished, this, &CustomSysmodel::finished);
        m_threadPool->start(worker);
    }

private slots:
    void loadMoreFiles()
    {
        int rowCount = this->rowCount();
        int diff = m_filePaths.size() - rowCount;
        if (diff > 0) {
            beginInsertRows(QModelIndex(), rowCount, rowCount + diff - 1);
            for (int i = rowCount; i < rowCount + diff && i < m_limit; i++) {
                QFileInfo fileInfo(m_filePaths.at(i));
                QFileSystemModel::fetchMore(QFileSystemModel::index(fileInfo.path()));
            }
            endInsertRows();
        }
    }

signals:
    void started();
    void finished();
    void fileFound(const QString &filePath);

private:
    int m_limit;
    QTimer *m_timer;
    QThreadPool *m_threadPool;
};

class FileSystemWorker : public QObject, public QRunnable
{
    Q_OBJECT
public:
    FileSystemWorker(const QString &path, QObject *parent = nullptr)
        : QObject(parent)
        , m_path(path)
    {
    }

    void run() override
    {
        QFileInfoList files = QDir(m_path).entryInfoList(QDir::Files);
        foreach (const QFileInfo &fileInfo, files) {
            emit fileFound(fileInfo.absoluteFilePath());
        }
        emit finished();
    }

signals:
    void started();
    void finished();
    void fileFound(const QString &filePath);

private:
    QString m_path;
};

主要的改动有：

1. 在 `CustomSysmodel` 中，将 `FileSystemWorker` 对象改为指针，并在 `fetchFiles` 中动态创建并启动该对象的线程；
2. 将 `FileSystemWorker` 继承自 `QObject`，以便可以发送信号；
3. 将 `FileSystemWorker` 继承自 `QRunnable`，以便可以在线程池中运行；
4. 在 `CustomSysmodel` 中，将 `fileFound` 和 `finished` 信号连接到对应的槽函数上；
5. 在 `CustomSysmodel` 中，将 `QFileSystemModel::fetchMore` 调用的逻辑移动到 `loadMoreFiles` 槽函数中，并在该函数中动态插入新的行。

以上修改方案仅供参考，具体实现可能需要根据实际情况进行调整。