在QML中创建复杂列表模型

// MyModel.h
#include <QAbstractListModel>

class MyModel : public QAbstractListModel
{
    Q_OBJECT
public:
    enum Roles {
        NameRole = Qt::UserRole + 1,
        AgeRole,
        GenderRole
    };

    explicit MyModel(QObject *parent = nullptr);

    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
    QHash<int, QByteArray> roleNames() const override;

private:
    struct Item {
        QString name;
        int age;
        QString gender;
    };

    QList<Item> m_items;
};

// MyModel.cpp
#include "MyModel.h"

MyModel::MyModel(QObject *parent)
    : QAbstractListModel(parent)
{
    // 初始化数据
    m_items.append({"John", 25, "Male"});
    m_items.append({"Alice", 30, "Female"});
    m_items.append({"Bob", 35, "Male"});
}

int MyModel::rowCount(const QModelIndex &parent) const
{
    if (parent.isValid())
        return 0;

    return m_items.count();
}

QVariant MyModel::data(const QModelIndex &index, int role) const
{
    if (!index.isValid())
        return QVariant();

    const Item &item = m_items[index.row()];

    switch (role) {
    case NameRole:
        return item.name;
    case AgeRole:
        return item.age;
    case GenderRole:
        return item.gender;
    default:
        return QVariant();
    }
}

QHash<int, QByteArray> MyModel::roleNames() const
{
    QHash<int, QByteArray> roles;
    roles[NameRole] = "name";
    roles[AgeRole] = "age";
    roles[GenderRole] = "gender";
    return roles;
}

// main.qml
import QtQuick 2.0

ListView {
    width: 200
    height: 200

    model: myModel // 模型类的实例

    delegate: Item {
        width: parent.width
        height: 40

        Text {
            text: name
            anchors.verticalCenter: parent.verticalCenter
        }

        Text {
            text: age
            anchors.verticalCenter: parent.verticalCenter
            anchors.right: parent.right
        }

        Text {
            text: gender
            anchors.verticalCenter: parent.verticalCenter
            anchors.right: age.left
        }
    }
}