undobuffer.py 文件源码

def __init__(self):
        """
        we'll need empty stacks for undo/redo and some state keeping
        """
        Gtk.TextBuffer.__init__(self)
        self.undo_stack = []
        self.redo_stack = []
        self.not_undoable_action = False
        self.undo_in_progress = False
        self.connect('insert-text', self.on_insert_text)
        self.connect('delete-range', self.on_delete_range)