QStringListModel

• mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QVBoxLayout>
#include <QListView>
#include <QPushButton>
#include <QStringListModel>
#include <QLineEdit>
#include <QMessageBox>
#include <QInputDialog>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
private slots:
    void insertData();
    void deleteData();
    void showData();

private:
    Ui::MainWindow *ui;

    QStringListModel* model;
    QListView* listView;
};

#endif // MAINWINDOW_H

• mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QStringList data;
    data << "data1" << "data2" << "data3" << "data4";
    model = new QStringListModel(this);
    model->setStringList(data);

    listView = new QListView(this);
    listView->setModel(model);

    QHBoxLayout *btnLayout = new QHBoxLayout;
    QPushButton *insertBtn = new QPushButton(tr("insert"), this);
    connect(insertBtn, SIGNAL(clicked()), this, SLOT(insertData()));
    QPushButton *delBtn = new QPushButton(tr("Delete"), this);
    connect(delBtn, SIGNAL(clicked()), this, SLOT(deleteData()));
    QPushButton *showBtn = new QPushButton(tr("Show"), this);
    connect(showBtn, SIGNAL(clicked()), this, SLOT(showData()));
    btnLayout->addWidget(insertBtn);
    btnLayout->addWidget(delBtn);
    btnLayout->addWidget(showBtn);

    QVBoxLayout* mainLayout = new QVBoxLayout(this);
    mainLayout->addWidget(listView);
    mainLayout->addLayout(btnLayout);

    QWidget *centralWidget = new QWidget();
    centralWidget->setLayout(mainLayout);
    setCentralWidget(centralWidget);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::insertData()
{
    bool isOK;
    QString text = QInputDialog::getText(this, "Insert",
                                         "input new data:",
                                         QLineEdit::Normal,
                                         "new data",
                                         &isOK);
    if (isOK) {
        int row = listView->currentIndex().row();
        model->insertRows(row, 1);
        QModelIndex index = model->index(row);
        model->setData(index, text);
        listView->setCurrentIndex(index);
        listView->edit(index);
    }
}

void MainWindow::deleteData()
{
    if (model->rowCount() > 1) {
        model->removeRows(listView->currentIndex().row(), 1);
    }
}

void MainWindow::showData()
{
    QStringList data = model->stringList();
    QString str;
    foreach(QString s, data) {
        str += s + "\n";
    }
    QMessageBox::information(this, "Data", str);
}