城市列表

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QListWidgetItem>

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

private slots:

    void on_addbutton_clicked();

    void on_deletebutton_clicked();

    void on_deleteAll_clicked();

    void on_showdir_clicked();

    void singleclickslot(QListWidgetItem*);

    void doubleclickslot(QListWidgetItem*);

private:

    Ui::MainWindow *ui;

};

#endif // MAINWINDOW_H

#include "mainwindow.h"

#include "ui_mainwindow.h"

//QListWidget  QListWidgetItem

#include <QDebug>

#include <QListWidgetItem>//项

#include <QStringList>

#include <QDir>

#include <QMessageBox>

#include <QFileDialog>  //获得文件

#include <QDebug>

//添加图标

//双击信号接受不到

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    //默认列表显示   修改为图标显示

    ui->listWidget->setViewMode(QListView::IconMode);

 //连接 enter健

    connect(ui->lineEdit,SIGNAL(returnPressed()),this,SLOT(on_addbutton_clicked()));

    connect(ui->listWidget,SIGNAL(itemClicked(QListWidgetItem*)),this,SLOT(singleclickslot(QListWidgetItem*)));

    connect(ui->listWidget,SIGNAL(itemDoubleClicked(QListWidgetItem*)),this,SLOT(doubleclickslot(QListWidgetItem*)));

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::on_addbutton_clicked()

{

    //create item

    QString cityname = ui->lineEdit->text();

    QListWidgetItem *item= new QListWidgetItem;

    //set item

    item->setText(cityname);

    //add item to listwidget

    ui->listWidget->addItem(item);

    ui->lineEdit->clear();

}

void MainWindow::on_deletebutton_clicked()

{

        //delete      获得当前行的行的项

    QListWidgetItem *item=ui->listWidget->takeItem(ui->listWidget->currentRow());

    if(item!=NULL)

    delete item;

}

void MainWindow::on_deleteAll_clicked()

{

    int count=0;

    while(1)

        {

　　　　//从第一行开始删除

        QListWidgetItem *item=ui->listWidget->takeItem(count);

         if(item!=NULL)

        delete item;

         if(ui->listWidget->count()==0)

             {

                qDebug()<<"clear ok!";

                break;

         }

    }

}

void MainWindow::on_showdir_clicked()

{   //获得当前路径的文件  

   // QStringList filenames = QFileDialog::getOpenFileNames(this,"Open files",QDir::currentPath());

       ui->listWidget->clear();

       //获得文件夹路径

    QDir dir=QDir::current();

    QStringList filenames=dir.entryList();

    if (filenames.size() == 0)

{

        QMessageBox::information(this,"Error","No file select");

        return;

    }

for(int index=0;index<filenames.size();index++)

    {//不显示  .. .

        if(filenames.at(index)=="."||filenames.at(index)=="..")

            continue;

    QListWidgetItem *item = new QListWidgetItem;

    item->setText(filenames.at(index));

    //添加到部件列表

    ui->listWidget->addItem(item);

}

}

void MainWindow::singleclickslot(QListWidgetItem* item)

{

    QMessageBox::information(this,"information","single click"+item->text());

}

void MainWindow::doubleclickslot(QListWidgetItem* item)

{

     QMessageBox::information(this,"information","double click"+item->text());

}