Qt学习之路(42): QStringListModel ++ 自己修改

工程代码：  42.rar  

豆子：http://devbean.blog.51cto.com/448512/265057

QVBoxLayout *mainLayout = new QVBoxLayout(this);//添加 主布局
mainLayout->addWidget(listview); //添加 listview
mainLayout->addLayout(btnLayout);//添加 水平布局到主布局中
this->setLayout(mainLayout);

#ifndef MYLISTVIEW_H
#define MYLISTVIEW_H

#include <QtGui>

class MyListView : public QWidget
{
    Q_OBJECT
public:
    MyListView();
private:
    QStringListModel *model;
    QListView *listview;

private slots:
    void insertData();
    void deleteData();
    void showData();
};

#endif // MYLISTVIEW_H

#include "mylistview.h"

MyListView::MyListView()
{
    //QStringListModel就是封装了QStringList的model
    model = new QStringListModel(this);
    QStringList data;
    data <<"Letter A" << "Letter B" << "Leccter C";
    model->setStringList(data);

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

    QHBoxLayout *btnLayout = new QHBoxLayout;//水平布局

    QPushButton *insertBtn = new QPushButton(tr("intsert"),this);
    QPushButton *delBtn = new QPushButton(tr("delete"),this);
    QPushButton *showBtn = new QPushButton(tr("show"),this);

    btnLayout->addWidget(insertBtn); //添加部件到布局中
    btnLayout->addWidget(delBtn);
    btnLayout->addWidget(showBtn);

    QVBoxLayout *mainLayout = new QVBoxLayout(this);//添加主布局
    mainLayout->addWidget(listview); //添加 listview
    mainLayout->addLayout(btnLayout);//添加 水平布局到主布局中
    this->setLayout(mainLayout);

    connect(insertBtn,SIGNAL(clicked()),this,SLOT(insertData()));
    connect(delBtn,SIGNAL(clicked()),this,SLOT(deleteData()));
    connect(showBtn,SIGNAL(clicked()),this,SLOT(showData()));
}

void MyListView::insertData()
{
    bool isOK;
    QString text = QInputDialog::getText(NULL,"insert","Please input new data:",QLineEdit::Normal,"You are inseting new data.",&isOK,0);
    if(isOK)
    {
        // 1. row 2. model 3. data

        //获取哪一行
        int row = listview->currentIndex().row();//listView()->currentIndex()函数，获取QListView当前行
        //插入一行
        model->insertRows(row,1);
        //使用model的index()函数获取当前行的QModelIndex对象，

        QModelIndex index = model->index(row);
        //使用setData()函数把我们用QInputDialog接受的数据插入
        model->setData(index,text);

        listview->setCurrentIndex(index);
        //调用edit()函数，这个函数使得这一行可以被编辑
        listview->edit(index);
    }
}

//在构造函数中，我们只想删除当前行，所以可以调用
//当前索引位置调用removeRows，并且把要删除的行数置为1
//我们需要依赖与模型才能够相应的更新这个视图
void MyListView::deleteData()
{
        if(model->rowCount() > 1) {
                model->removeRows(listview->currentIndex().row(), 1);
        }
}

void MyListView::showData()
{
        QStringList data = model->stringList();
        QString str;
        foreach(QString s, data) { //重复使用data
                str += s + "\n";
        }

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