QT做一个硬盘目录视图QTreeView，QDirModel





首先，我们来看一个很有用的model：QDirModel。这个model允许我们在view中显示操作系统的目录结构，

当然我们肯定要用到QTreeView。这次让我们先来看看运行结果：

首先，我们要建立一个QT的项目，然后呢点击项目属性，添加新文件，选择c++ Class，点击Choose输入一个类名，

接着在.h文件里面添加要用到的类

#ifndef MYTREEVIEW_H

#define MYTREEVIEW_H
#include <QWidget>
#include <QDirModel>
#include <QTreeView>
#include <QMainWindow>
class MyTreeView :public QWidget
{
        Q_OBJECT
public:
        MyTreeView();//构造
private:
        QDirModel *model;//定义模型变量
        QTreeView *treeView;//定义树视图
private slots:
        void mkdir();
        void rm();
};
#endif // MYTREEVIEW_H
接着就在.cpp文件里面去写代码了：

#include "mytreeview.h"

#include <QTreeView>
#include <QHeaderView>
#include <QHBoxLayout>//布局类
#include <QString>//文本类
#include <QPushButton>
#include <QInputDialog>
#include <QMessageBox>//
MyTreeView::MyTreeView()
{
        model = new QDirModel;//模型
        model->setReadOnly(false);//设置为只读
        model->setSorting(QDir::DirsFirst | QDir::IgnoreCase | QDir::Name);//排序
        treeView = new QTreeView;//
        treeView->setModel(model);
        treeView->header()->setStretchLastSection(true);
        treeView->header()->setSortIndicator(0, Qt::AscendingOrder);
        treeView->header()->setSortIndicatorShown(true);
       // treeView->header()->setClickable(true);
        QModelIndex index = model->index(QDir::currentPath());
        treeView->expand(index);
        treeView->scrollTo(index);
        treeView->resizeColumnToContents(0);
        QHBoxLayout *btnLayout = new QHBoxLayout;
        QPushButton *createBtn = new QPushButton(tr("Create Directory..."));
        QPushButton *delBtn = new QPushButton(tr("Remove"));
        btnLayout->addWidget(createBtn);
        btnLayout->addWidget(delBtn);
        QVBoxLayout *mainLayout = new QVBoxLayout(this);
        mainLayout->addWidget(treeView);
        mainLayout->addLayout(btnLayout);
        this->setLayout(mainLayout);
        connect(createBtn, SIGNAL(clicked()), this, SLOT(mkdir()));
        connect(delBtn, SIGNAL(clicked()), this, SLOT(rm()));
}
void MyTreeView::mkdir()
{
        QModelIndex index = treeView->currentIndex();
        if (!index.isValid()) {
                return;
        }
        QString dirName = QInputDialog::getText(this,tr("Create Directory"),tr("Directory name"));
        if (!dirName.isEmpty()) {
                if (!model->mkdir(index, dirName).isValid()) {
                        QMessageBox::information(this, tr("Create Directory"),  tr("Failed to create the directory"));
                }
        }
}
void MyTreeView::rm()
{
        QModelIndex index = treeView->currentIndex();
        if (!index.isValid()) {
                return;
        }
        bool ok;
        if (model->fileInfo(index).isDir()) {
                ok = model->rmdir(index);
        } else {
                ok = model->remove(index);
        }
        if (!ok) {
                QMessageBox::information(this, tr("Remove"),tr("Failed to remove %1").arg(model->fileName(index)));
        }
}
然后在，main.cpp文件里面   

MyTreeView b;

    b.show();
就可以了