Windows的资源管理器，大家很熟悉吧，可以放回上一级，查找到下一级………Qt中QDir 类可以实现显示文件系统目录的效果。

笔者的机器环境：Windows8.1

//fileview_widget.h#ifndef FILEVIEWWIDGET_H  
#define FILEVIEWWIDGET_H  #include <QWidget>  
#include <QDir>  
#include <QListWidgetItem>  
#include <QFileInfoList>  
#include <QListWidget>  
#include <QLineEdit>  
#include <QVBoxLayout>  
#include <QIcon>  
#include <QStringList>  class FileViewWidget : public QWidget  
{  Q_OBJECT  
public:  FileViewWidget(QWidget *parent=0);  //—用双击浏览器中显示的目录进入下一级，或者返回上一级目录。  void showFileInfoList(QFileInfoList list);  public slots:  //–显示当前目录下的所有文件  void slotShow(QDir dir);  //—-根据选择显示下一级目录下的文件，  void slotDirShow(QListWidgetItem *Item);  private:  QLineEdit *fileLineEdit;  QListWidget *fileListWidget;  QVBoxLayout *vLayout;  QFileInfoList list;  
};  #endif  //FILEVIEWWIDGET_H  

 

//fileview_widget.cpp#include “fileview_widget.h”  
#include<QTextCodec>  FileViewWidget::FileViewWidget(QWidget *parent/*=0*/) :QWidget(parent)  
{  //—–实例化对象  fileLineEdit = new QLineEdit(“/”, this);  fileListWidget = new QListWidget(this);  //—布局  vLayout = new QVBoxLayout(this);  vLayout->addWidget(fileLineEdit);  vLayout->addWidget(fileListWidget);  //–设置对应信号与槽  connect(fileLineEdit, SIGNAL(returnPressed()),   this, SLOT(slotDirShow(QDir)));  connect(fileListWidget, SIGNAL(itemDoubleClicked(QListWidgetItem *)),  this, SLOT(slotDirShow(QListWidgetItem*)));  QString rootStr = ”/”;  QDir rootDir(rootStr);  QStringList stringlist;  stringlist << ”*”;  list = rootDir.entryInfoList(stringlist);  showFileInfoList(list);  //—显示布局  setLayout(vLayout);  //—-设置窗口属性  setWindowTitle(”File View”);  
}  //–显示当前目录下的所有文件  
void FileViewWidget::slotShow(QDir dir)  
{  QStringList stringList;  stringList << ”*”;  QFileInfoList InfoList = dir.entryInfoList(stringList, QDir :: AllEntries, QDir :: DirsFirst);  showFileInfoList(InfoList);  
}  //—用双击浏览器中显示的目录进入下一级，或者返回上一级目录。  
void FileViewWidget::showFileInfoList(QFileInfoList list)  
{  //–清空列表控件  fileListWidget->clear();  //—-取出所有项，按照目录，文件方式添加到控件内  for (unsigned int i = 0; i < list.count(); i++)  {  QFileInfo tmpFileInfo = list.at(i);  if (tmpFileInfo.isDir())  {  QIcon icon(”dir.png”);  QString fileName = tmpFileInfo.fileName();  QListWidgetItem*tmpListWidgetItem = new QListWidgetItem(icon, fileName);  fileListWidget->addItem(tmpListWidgetItem);  }  else  {  QIcon icon(”file.png”);  QString fileName = tmpFileInfo.fileName();  QListWidgetItem*tmpListWidgetItem = new QListWidgetItem(icon, fileName);  fileListWidget->addItem(tmpListWidgetItem);  }  }  
}  //—-根据用户的选择显示下一级目录下的文件，  
void FileViewWidget::slotDirShow(QListWidgetItem *Item)  
{  //—-保存下一级目录名  QString string = Item->text();  QDir dir;  //—-设置路径为当前目录路径  dir.setPath(fileLineEdit->text());  //—–重新设置路径  dir.cd(string);  //—-更新当前显示路径， 这里获取的是绝对路径  fileLineEdit->setText(dir.absolutePath());  //—显示当前文件目录下的所有文件  slotShow(dir);  
}  

//main.cpp#pragma once  
#include <QtWidgets/QApplication>  
#include “fileview_widget.h”  int main(int argc, char *argv[])  
{  QApplication a(argc, argv);  FileViewWidget win;  win.show();  return a.exec();  
}  

 

 下面是运行结果

 

                                                     

这里笔者列出关于QDir::Filter 的过滤方式，信息来源：assistant

Constant	Value	Description
QDir::Dirs	0x001	List directories that match the filters.
QDir::AllDirs	0x400	List all directories; i.e. don't apply the filters to directory names.
QDir::Files	0x002	List files.
QDir::Drives	0x004	List disk drives (ignored under Unix).
QDir::NoSymLinks	0x008	Do not list symbolic links (ignored by operating systems that don't support symbolic links).
QDir::NoDotAndDotDot	NoDot | NoDotDot	Do not list the special entries "." and "..".
QDir::NoDot	0x2000	Do not list the special entry ".".
QDir::NoDotDot	0x4000	Do not list the special entry "..".
QDir::AllEntries	Dirs | Files | Drives	List directories, files, drives and symlinks (this does not list broken symlinks unless you specify System).
QDir::Readable	0x010	List files for which the application has read access. The Readable value needs to be combined with Dirs or Files.
QDir::Writable	0x020	List files for which the application has write access. The Writable value needs to be combined with Dirs or Files.
QDir::Executable	0x040	List files for which the application has execute access. The Executable value needs to be combined with Dirs or Files.
QDir::Modified	0x080	Only list files that have been modified (ignored on Unix).
QDir::Hidden	0x100	List hidden files (on Unix, files starting with a ".").
QDir::System	0x200	List system files (on Unix, FIFOs, sockets and device files are included; on Windows, .lnk files are included)
QDir::CaseSensitive	0x800	The filter should be case sensitive.