QListView

main.cpp

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#include <QApplication>
#include <QWidget>
#include <QListView>
#include <QStringListModel>
#include <QVBoxLayout>
#include <QPushButton>
#include <QLineEdit>
#include <qlabel.h>

void setupListViewDemo(QWidget *parent) {
    QVBoxLayout *layout = new QVBoxLayout(parent);

    // --- 1. 创建数据模型 (Model) ---
    // 模型负责管理数据
    QStringList data;
    data << "Android" << "iOS" << "Windows" << "Linux";
    QStringListModel *model = new QStringListModel(data, parent);

    // --- 2. 创建视图 (View) ---
    // 视图只负责显示
    QListView *listView = new QListView(parent);
    listView->setModel(model); // 💡 核心步骤：将模型注入视图

    // --- 3. 动态操作数据 ---
    QLineEdit *lineEdit = new QLineEdit(parent);
    lineEdit->setPlaceholderText("输入新系统名称...");

    QPushButton *btnAdd = new QPushButton("添加到模型", parent);

    // 逻辑：我们操作的是【模型】，视图会自动刷新！
    QObject::connect(btnAdd, &QPushButton::clicked, [model, lineEdit]() {
        QString newText = lineEdit->text();
        if (!newText.isEmpty()) {
            int row = model->rowCount(); // 获取当前行数
            model->insertRow(row);       // 在末尾插入一行
            QModelIndex index = model->index(row);
            model->setData(index, newText); // 设置该行的数据
            lineEdit->clear();
        }
    });

    // --- 4. 信号：点击视图获取数据 ---
    QObject::connect(listView, &QListView::clicked, [model](const QModelIndex &index) {
        // index 是模型提供的一个“坐标”
        QString text = model->data(index).toString();
        qDebug() << "你点击了第" << index.row() << "行，内容是：" << text;
    });

    layout->addWidget(new QLabel("QListView (基于 Model/View):"));
    layout->addWidget(listView);
    layout->addWidget(lineEdit);
    layout->addWidget(btnAdd);
}

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    QWidget w;
    w.resize(300, 400);
    setupListViewDemo(&w);
    w.show();
    return a.exec();
}