在Qt quick中从c++文件填充组合框项目

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QAbstractListModel>
#include <QStringList>

class ComboBoxModel : public QAbstractListModel
{
    Q_OBJECT
public:
    enum Roles {
        OptionRole = Qt::UserRole + 1
    };

    ComboBoxModel(QObject *parent = nullptr)
        : QAbstractListModel(parent)
    {
        m_options << "Option 1" << "Option 2" << "Option 3";
    }

    int rowCount(const QModelIndex &parent = QModelIndex()) const override
    {
        Q_UNUSED(parent)
        return m_options.count();
    }

    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override
    {
        if (!index.isValid())
            return QVariant();

        if (role == Qt::DisplayRole || role == OptionRole)
            return m_options[index.row()];

        return QVariant();
    }

private:
    QStringList m_options;
};

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    qmlRegisterType<ComboBoxModel>("ComboBoxModel", 1, 0, "ComboBoxModel");

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();
}

import QtQuick 2.15
import QtQuick.Controls 2.15

import ComboBoxModel 1.0

ApplicationWindow {
    visible: true
    width: 400
    height: 300
    title: "ComboBox Example"

    ComboBox {
        id: comboBox
        width: parent.width * 0.8
        model: ComboBoxModel {}

        onActivated: {
            var option = comboBox.model.get(index, ComboBoxModel.OptionRole)
            console.log("Selected option:", option)
        }
    }
}