Qt学习之路之文件浏览器

- 日理万妓 2022-08-06 08:09 275阅读 0赞

**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**

**看代码~~**

**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**

**![Center][]**

**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.

[Center]: /images/20220806/8161c2ee6a644b6397b4076c079dd456.png

Qt学习之路之文件浏览器

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