Qt 模型视图

Widget::Widget(QWidget *parent)

    : QWidget(parent)

{

    QStringList data;

    data << "Letter A" << "Letter B" << "Letter C";

    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);

    setLayout(mainLayout);

}

Widget::~Widget()

{

}

///关于QStringListModel我们简单介绍这些。从这些示例中可以看到，

/// 几乎所有操作都是针对模型的，也就是说，我们直接对数据进行操作，

/// 当模型检测到数据发生了变化，会立刻通知视图进行刷新。这样，我

/// 们就可以把精力集中到对数据的操作上，而不用担心视图的同步显示

/// 问题。这正是 model/view 模型所带来的一个便捷之处

void Widget::insertData()

{

    bool isOK;

    QString text = QInputDialog::getText(this, "Insert",

                                         "Please input new data:",

                                         QLineEdit::Normal,

                                         "You are inserting new data.",

                                         &isOK);

    if(isOK)

    {

        QModelIndex currIndex = listView->currentIndex();

        model->insertRows(currIndex.row(),1);//插入当前位置一行

        model->setData(currIndex,text); //更新数据

        listView->edit(currIndex);//可编辑

    }

}

void Widget::deleteData()

{

    if (model->rowCount() > 1) {

        model->removeRows(listView->currentIndex().row(), 1);

    }

}

void Widget::showData()

{

    QStringList data = model->stringList();

    QString str;

    foreach(QString s, data) {

        str += s + "\n";

    }

    //QMessageBox::information(this, "Data", str);

}