Qt学习之路之文件浏览器

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

                                                     

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.