Create the QTableView that will hold the level model.

def create_table_level(self):
        """Create the QTableView that will hold the level model."""
        self.table_level = QTableView()
        self.table_level.setEditTriggers(QTableWidget.NoEditTriggers)
        self.table_level.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        self.table_level.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        self.table_level.setFrameStyle(QFrame.Plain)
        self.table_level.horizontalHeader().sectionResized.connect(
                                                        self._index_resized)
        self.table_level.verticalHeader().sectionResized.connect(
                                                        self._header_resized)
        self.table_level.setItemDelegate(QItemDelegate())
        self.layout.addWidget(self.table_level, 0, 0)
        self.table_level.setContentsMargins(0, 0, 0, 0)
        self.table_level.horizontalHeader().sectionClicked.connect(
                                                            self.sortByIndex)