def __init__(self, parent=None, is_half_star=False):
QComboBox.__init__(self, parent)
self.undo_stack = QUndoStack(self)
self.undo, self.redo = self.undo_stack.undo, self.undo_stack.redo
self.allow_undo = False
self.is_half_star = is_half_star
self._model = RatingModel(is_half_star=is_half_star, parent=self)
self.setModel(self._model)
self.delegate = QStyledItemDelegate(self)
self.view().setItemDelegate(self.delegate)
self.view().setStyleSheet('QListView { background: palette(window) }\nQListView::item { padding: 6px }')
self.setMaxVisibleItems(self.count())
self.currentIndexChanged.connect(self.update_font)
