(三)使用预定义模型QDirModel的例子

目录：

(一) Qt Model/View 的简单说明 、预定义模型

(二)使用预定义模型 QstringListModel例子

(三)使用预定义模型QDirModel的例子

(四)Qt实现自定义模型基于QAbstractTableModel

(五)Qt实现自定义模型基于QAbstractItemModel 

(六) Qt实现自定义委托 QDelegate

 

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 = 0);

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(0, 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(0);

    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)));
}