How to use the reprounzip-qt.reprounzip_qt.gui.run.FilesManager function in reprounzip-qt

def __init__(self, directory, unpacker=None, root=None, **kwargs):
        super(FilesManager, self).__init__(**kwargs)
        self.directory = directory
        self.unpacker = unpacker
        self.root = root

        layout = QtWidgets.QHBoxLayout()

        self.files_widget = QtWidgets.QListWidget(
            selectionMode=QtWidgets.QListWidget.SingleSelection)
        self.files_widget.itemSelectionChanged.connect(self._file_changed)
        layout.addWidget(self.files_widget)

        right_layout = QtWidgets.QGridLayout()
        right_layout.addWidget(QtWidgets.QLabel("name:"), 0, 0)
        self.f_name = QtWidgets.QLineEdit('', readOnly=True)
        right_layout.addWidget(self.f_name, 0, 1)
        right_layout.addWidget(QtWidgets.QLabel("Path:"), 1, 0)

def _open_files_manager(self):
        manager = FilesManager(
            parent=self,
            directory=self.directory_widget.text(),
            unpacker=self.unpacker,
            root=ROOT.INDEX_TO_OPTION[self.root.currentIndex()])
        manager.exec_()