QVariant QCustomFileSystemModel::data(const QModelIndex &index, int role) const
{
    if(role == Qt::DecorationRole)
    {
        if(isDir(index))
        {
            return QIcon(":/resource/Folder.png");
        }
         else
        {
            return QIcon(":/resource/File.png");
        }
    }
    return QFileSystemModel::data(index, role);
}