main.cpp Example File

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  #include <QApplication>
  #include <QQmlApplicationEngine>
  #include <QtQml>
  #include <QFileSystemModel>
  #include <QDateTime>
  #include <QDesktopServices>
  #include <QUrl>

  static inline QString permissionString(const QFileInfo &fi)
  {
      const QFile::Permissions permissions = fi.permissions();
      QString result = QLatin1String("----------");
      if (fi.isSymLink())
          result[0] = QLatin1Char('l');
      else if (fi.isDir())
          result[0] = QLatin1Char('d');
      if (permissions & QFileDevice::ReadUser)
          result[1] = QLatin1Char('r');
      if (permissions & QFileDevice::WriteUser)
          result[2] = QLatin1Char('w');
      if (permissions & QFileDevice::ExeUser)
          result[3] = QLatin1Char('x');
      if (permissions & QFileDevice::ReadGroup)
          result[4] = QLatin1Char('r');
      if (permissions & QFileDevice::WriteGroup)
          result[5] = QLatin1Char('w');
      if (permissions & QFileDevice::ExeGroup)
          result[6] = QLatin1Char('x');
      if (permissions & QFileDevice::ReadOther)
          result[7] = QLatin1Char('r');
      if (permissions & QFileDevice::WriteOther)
          result[8] = QLatin1Char('w');
      if (permissions & QFileDevice::ExeOther)
          result[9] = QLatin1Char('x');
      return result;
  }

  static inline QString sizeString(const QFileInfo &fi)
  {
      if (!fi.isFile())
          return QString();
      const qint64 size = fi.size();
      if (size > 1024 * 1024 * 10)
          return QString::number(size / (1024 * 1024)) + QLatin1Char('M');
      if (size > 1024 * 10)
          return QString::number(size / 1024) + QLatin1Char('K');
      return QString::number(size);
  }

  class DisplayFileSystemModel : public QFileSystemModel {
      Q_OBJECT
  public:
      explicit DisplayFileSystemModel(QObject *parent = Q_NULLPTR)
          : QFileSystemModel(parent) {}

      enum Roles  {
          SizeRole = Qt::UserRole + 4,
          DisplayableFilePermissionsRole = Qt::UserRole + 5,
          LastModifiedRole = Qt::UserRole + 6,
          UrlStringRole = Qt::UserRole + 7
      };
      Q_ENUM(Roles)

      QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const Q_DECL_OVERRIDE
      {
          if (index.isValid() && role >= SizeRole) {
              switch (role) {
              case SizeRole:
                  return QVariant(sizeString(fileInfo(index)));
              case DisplayableFilePermissionsRole:
                  return QVariant(permissionString(fileInfo(index)));
              case LastModifiedRole:
                  return QVariant(fileInfo(index).lastModified().toString(Qt::SystemLocaleShortDate));
              case UrlStringRole:
                  return QVariant(QUrl::fromLocalFile(filePath(index)).toString());
              default:
                  break;
              }
          }
          return QFileSystemModel::data(index, role);
      }

      QHash<int,QByteArray> roleNames() const Q_DECL_OVERRIDE
      {
           QHash<int, QByteArray> result = QFileSystemModel::roleNames();
           result.insert(SizeRole, QByteArrayLiteral("size"));
           result.insert(DisplayableFilePermissionsRole, QByteArrayLiteral("displayableFilePermissions"));
           result.insert(LastModifiedRole, QByteArrayLiteral("lastModified"));
           return result;
      }
  };

  int main(int argc, char *argv[])
  {
      QApplication app(argc, argv);

      QQmlApplicationEngine engine;
      qmlRegisterUncreatableType<DisplayFileSystemModel>("io.qt.examples.quick.controls.filesystembrowser", 1, 0,
                                                         "FileSystemModel", "Cannot create a FileSystemModel instance.");
      QFileSystemModel *fsm = new DisplayFileSystemModel(&engine);
      fsm->setRootPath(QDir::homePath());
      fsm->setResolveSymlinks(true);
      engine.rootContext()->setContextProperty("fileSystemModel", fsm);
      engine.rootContext()->setContextProperty("rootPathIndex", fsm->index(fsm->rootPath()));
      engine.load(QUrl(QStringLiteral("qrc:///main.qml")));
      if (engine.rootObjects().isEmpty())
          return -1;

      return app.exec();
  }

  #include "main.moc"