Qt：文件系统浏览

淡淡的烟草味﹌ 2022-10-25 01:00 52阅读 0赞

新建QtGUI应用，基于QDialog，取消界面创建

#include "dialog.h"
    
    Dialog::Dialog(QWidget *parent)
        : QDialog(parent)
    {
        setWindowTitle(tr("File View"));
    
        fileLineEdit = new QLineEdit(tr("/"));
        fileListWidget = new QListWidget;
    
        mainLayout = new QVBoxLayout(this);
        mainLayout->addWidget(fileLineEdit);
        mainLayout->addWidget(fileListWidget);
    
        connect(fileLineEdit,SIGNAL(returnPressed()),this,SLOT(slotShow(QDir)));
        connect(fileListWidget,SIGNAL(itemDoubleClicked(QListWidgetItem*)),this,SLOT(slotDirShow(QListWidgetItem*)));
    
        QString root = "/";
        QDir rootDir(root);
        QStringList string;
        string << "*";
        QFileInfoList list = rootDir.entryInfoList(string);
        showFileInfoList(list);
    }
    
    Dialog::~Dialog()
    {
    
    }
    //显示dir下的所有文件
    void Dialog::slotShow(QDir dir)
    {
        QStringList string;
        string<<"*";
        QFileInfoList list=dir.entryInfoList(string,QDir::AllEntries,QDir::DirsFirst);
        //文件名的过滤方式。列出目录，文件，磁盘驱动器。目录优先排序
        showFileInfoList(list);
    }
    //用户双击进入下一级目录，单击".."返回上级，顶部的编辑框显示当前所在的目录，类表显示该目录下所有文件
    void Dialog::showFileInfoList(QFileInfoList list)
    {
        fileListWidget->clear();
        for(unsigned int i = 0; i < list.count(); i++) //从类表中依次取出所有项
        {
            QFileInfo tmpFileInfo = list.at(i);
            if(tmpFileInfo.isDir())
            {
                QIcon icon("dir.png");
                QString fileName = tmpFileInfo.fileName();
                QListWidgetItem *tmp = new QListWidgetItem(icon, fileName);
                fileListWidget->addItem(tmp);
            }
            else if(tmpFileInfo.isFile())
            {
                QIcon icon("file.png");
                QString fileName=tmpFileInfo.fileName();
                QListWidgetItem *tmp = new QListWidgetItem(icon,fileName);
                fileListWidget->addItem(tmp);
            }
        }
    }
    //显示下一级目录中的所有文件
    void Dialog::slotDirShow(QListWidgetItem * item)
    {
        QString str = item->text();  //将下一级的目录名保存在str中
        QDir dir;
        dir.setPath(fileLineEdit->text());//设置QDir对象的路径为当前目录路径
        dir.cd(str);//切换路径
        fileLineEdit->setText(dir.absolutePath());//刷新当前的目录路径
        slotShow(dir);
    }

![e39aa7474e3dd2db9c45aea747a880e3.png][]

entryInfoList按照某种过滤方式获取目录下的文件列表

![4a7043d03cfb0ae97363385142599eadb9f.jpg][]

![1f3e5ee7ac88d798cf809b7831467c2b81e.jpg][]

[e39aa7474e3dd2db9c45aea747a880e3.png]: /images/20221024/5cb4951eb83c4c71ad99b53f08ad10b5.png
[4a7043d03cfb0ae97363385142599eadb9f.jpg]: /images/20221024/8c7b34ba8cf44db1a9805c6e62af1cc7.png
[1f3e5ee7ac88d798cf809b7831467c2b81e.jpg]: /images/20221024/fe14949a0dc348689717f716b9145480.png