(三)使用预定义模型QDirModel的例子

使用预定义模型QDirModel的例子

Main.cpp

#include <QApplication>

#include "directoryviewer.h"

int main(int argc, char *argv[])

{

    QApplication app(argc, argv);

    DirectoryViewer directoryViewer;

    directoryViewer.show();

    return app.exec();

}

directoryviewer.h

#ifndef DIRECTORYVIEWER_H

#define DIRECTORYVIEWER_H

#include <QDialog>

class QDialogButtonBox;

class QDirModel;

class QTreeView;

class DirectoryViewer : public QDialog

{

    Q_OBJECT

public:

    DirectoryViewer(QWidget *parent = );

private slots:

    void createDirectory();

    void remove();

private:

    QTreeView *treeView;

    QDirModel *model;

    QDialogButtonBox *buttonBox;

};

#endif

directoryviewer.cpp

#include <QtGui>

#include "directoryviewer.h"

DirectoryViewer::DirectoryViewer(QWidget *parent)

    : QDialog(parent)

{

    //创建一个目录模型

    model = new QDirModel;

    //可编辑

    model->setReadOnly(false);

    //初始排序属性 目录在前，然后文件

    model->setSorting(QDir::DirsFirst | QDir::IgnoreCase | QDir::Name);

    treeView = new QTreeView;

    treeView->setModel(model);

    treeView->header()->setStretchLastSection(true);

    treeView->header()->setSortIndicator(, Qt::AscendingOrder);

    treeView->header()->setSortIndicatorShown(true);

    treeView->header()->setClickable(true);

    //当前目录的模型索引

    QModelIndex index = model->index(QDir::currentPath());

    //如果需要就打开它的父对象一直到根节点，并且调用scrollTo()滚动倒当前项，确保它是可见的

    treeView->expand(index);

    treeView->scrollTo(index);

    //确保第一列足够宽，可以显示它所有的条目。

    treeView->resizeColumnToContents();

    buttonBox = new QDialogButtonBox(Qt::Horizontal);

    QPushButton *mkdirButton = buttonBox->addButton(

            tr("&Create Directory..."), QDialogButtonBox::ActionRole);

    QPushButton *removeButton = buttonBox->addButton(tr("&Remove"),

            QDialogButtonBox::ActionRole);

    buttonBox->addButton(tr("&Quit"), QDialogButtonBox::AcceptRole);

    connect(mkdirButton, SIGNAL(clicked()),

            this, SLOT(createDirectory()));

    connect(removeButton, SIGNAL(clicked()), this, SLOT(remove()));

    connect(buttonBox, SIGNAL(accepted()), this, SLOT(accept()));

    QVBoxLayout *mainLayout = new QVBoxLayout;

    mainLayout->addWidget(treeView);

    mainLayout->addWidget(buttonBox);

    setLayout(mainLayout);

    setWindowTitle(tr("Directory Viewer"));

}

void DirectoryViewer::createDirectory()

{

    //获取当前目录 模型索引

    QModelIndex index = treeView->currentIndex();

    if (!index.isValid())

        return;

    //获取创建目录名

    QString dirName = QInputDialog::getText(this,

                              tr("Create Directory"),

                              tr("Directory name"));

    //创建子目录 mkdir(模型索引，目录名)

    if (!dirName.isEmpty()) {

        if (!model->mkdir(index, dirName).isValid())

            QMessageBox::information(this, tr("Create Directory"),

                    tr("Failed to create the directory"));

    }

}

void DirectoryViewer::remove()

{

    QModelIndex index = treeView->currentIndex();

    if (!index.isValid())

        return;

    //删除目录 rmdir(模型索引)

    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)));

}

转自：http://qimo601.iteye.com/blog/1534325