qml使用c++自定义listmodel数据

qml要使用c++中自定义的model，首先该model类需要继承QAbstractListModel类，然后需要重写其中的三个函数，分别是
int rowCount(const QModelIndex &parent);
QVariant data(const QModelIndex &index, int role = Qt::DisplayRole);
QHash<int,QByteArray> roleNames();

代码如下：
DriverModel.h

#ifndef DRIVERMODEL_H
#define DRIVERMODEL_H#include <QStringList>
#include <QObject>
#include <QtQml>class DriverModel : public QAbstractListModel
{Q_OBJECT
public:typedef struct DriverData{QString type;QString desc;QString version;}DriverData;static DriverModel *instance(QObject *parent = nullptr) {static DriverModel *instance = nullptr;static std::mutex instance_mutex;if (instance == nullptr) {std::lock_guard<std::mutex> guard(instance_mutex);if (instance == nullptr) {instance = new DriverModel(parent);}}return instance;}explicit DriverModel(QObject *parent = nullptr){appendItem(QString::fromLocal8Bit("显卡"),"Raden RX220","1.25.0.1");}enum LIST_ITEM_ROLE{type = Qt::UserRole+1,desc,version};public://必须重写三个函数int rowCount(const QModelIndex &parent) const override{Q_UNUSED(parent);return m_list.count();}QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override{int row = index.row();if(row < 0 || row >= m_list.count()) {return QVariant();}switch(role){case type:return m_list.value(row).type;case desc:return m_list.value(row).desc;case version:return m_list.value(row).version;default:break;}return QVariant();}QHash<int,QByteArray> roleNames() const override{QHash<int, QByteArray> roles;roles[desc] = "desc";roles[type] = "type";roles[version] = "version";return roles;}public://追加数据void appendItem(const QString& type,const QString& desc,const QString& version){DriverData data;data.type = type;data.desc = desc;data.version = version;beginInsertRows(QModelIndex(), m_list.size(), m_list.size());m_list.append(data);endInsertRows();}//清空模型数据void clearModelData() {beginResetModel();m_list.clear();endResetModel();}private:QList<DriverData> m_list;};#endif // DRIVERMODEL_H

main.cpp

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include "DriverModel.h"int main(int argc, char *argv[])
{QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);QGuiApplication app(argc, argv);QQmlApplicationEngine engine;engine.rootContext()->setContextProperty("driverModel",DriverModel::instance());const QUrl url(QStringLiteral("qrc:/main.qml"));QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,&app, [url](QObject *obj, const QUrl &objUrl) {if (!obj && url == objUrl)QCoreApplication::exit(-1);}, Qt::QueuedConnection);engine.load(url);return app.exec();
}

main.qml

import QtQuick 2.12
import QtQuick.Window 2.12Window {visible: truewidth: 640height: 480title: qsTr("Hello World")ListView{width: parent.widthheight: parent.heightvisible: truemodel: driverModeldelegate: Item{Text{id:text1text: type}Text{id:text2text: descanchors.top: text1.bottom}Text{text: versionanchors.top: text2.bottom}}}
}