C++ qml tablemodel

如果你想在C++中创建一个用于QML的TableModel，可以遵循以下步骤：

1. 创建一个继承自 QAbstractTableModel 的 C++ 类，例如 MyTableModel。

#ifndef MYTABLEMODEL_H
#define MYTABLEMODEL_H

#include <QAbstractTableModel>
#include <QList>

class MyTableModel : public QAbstractTableModel
{
    Q_OBJECT

public:
    explicit MyTableModel(QObject *parent = nullptr);

    // 实现必要的虚函数
    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
    int columnCount(const QModelIndex &parent = QModelIndex()) const override;
    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;

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

    QList<Item> m_items;
};

#endif // MYTABLEMODEL_H

2. 在实现文件中，实现 MyTableModel 类的函数。

#include "mytablemodel.h"

MyTableModel::MyTableModel(QObject *parent) : QAbstractTableModel(parent)
{
    // 初始化数据
    m_items.append({"张三", 25, "男"});
    m_items.append({"李四", 30, "女"});
    m_items.append({"王五", 35, "男"});
}

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

    return m_items.count();
}

int MyTableModel::columnCount(const QModelIndex &parent) const
{
    if (parent.isValid())
        return 0;

    return 3; // 列数为3
}

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

    if (role == Qt::DisplayRole) {
        const Item &item = m_items.at(index.row());

        if (index.column() == 0)
            return item.name;
        else if (index.column() == 1)
            return item.age;
        else if (index.column() == 2)
            return item.gender;
    }

    return QVariant();
}

QVariant MyTableModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    if (role != Qt::DisplayRole)
        return QVariant();

    if (orientation == Qt::Horizontal) {
        if (section == 0)
            return "姓名";
        else if (section == 1)
            return "年龄";
        else if (section == 2)
            return "性别";
    }

    return QVariant();
}

3. 在 main.cpp 中将 MyTableModel 注册给 QML。

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include "mytablemodel.h"

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

    QGuiApplication app(argc, argv);

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

    QQmlApplicationEngine engine;
    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();
}

现在，你可以在 QML 中使用 MyTableModel 了。以下是一个示例：

import QtQuick 2.15
import QtQuick.Controls 2.15
import MyTableModel 1.0

ApplicationWindow {
    visible: true
    width: 400
    height: 300
    title: "示例"

    ListView {
        width: 400
        height: 300

        model: MyTableModel {}

        delegate: Row {
            spacing: 10

            Text {
                text: model.name
                width: 100
            }

            Text {
                text: model.age
                width: 100
            }

            Text {
                text: model.gender
                width: 100
            }
        }
    }
}

在这个示例中，我们使用了 MyTableModel 类作为 ListView 的 model。在 delegate 中，我们可以直接访问 model 的属性，例如 name、age 和 gender。

希望这对你有帮助！如有其他问题，请随时提问。