QDirModel

#include "dialog.h"
#include "ui_dialog.h"
#include<QInputDialog>

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
    model = new QDirModel(this);
    model->setReadOnly(false);
    model->setSorting(QDir::DirsFirst|QDir::IgnoreCase|QDir::Name);

    ui->treeView->setModel(model);
    QModelIndex index=model->index("E:/");

    ui->treeView->expand(index);
    ui->treeView->scrollTo(index);
    ui->treeView->setCurrentIndex(index);
    ui->treeView->resizeColumnToContents(0);
}

Dialog::~Dialog()
{
    delete ui;
}

void Dialog::on_pushButton_2_clicked()
{
    //make
    QModelIndex index = ui->treeView->currentIndex();
    if(!index.isValid()) return;

    QString name = QInputDialog::getText(this, "name","Enter a name:");
    if(name.isEmpty()) return;
    model->mkdir(index,name);
}

void Dialog::on_pushButton_clicked()
{
    //delete
    QModelIndex index = ui->treeView->currentIndex();
    if(!index.isValid()) return;

    if(model->fileInfo(index).isDir())
    {
        //dir
        model->rmdir(index);
    }
    else
    {
        //file
        model->remove(index);
    }
}