admin.py 文件源码

def indented_title(self, instance):
        """
        Use Unicode box-drawing characters to visualize the tree hierarchy.
        """
        box_drawing = []
        for i in range(instance.depth - 2):
            box_drawing.append('<i class="l"></i>')
        if instance.depth > 1:
            box_drawing.append('<i class="a"></i>')

        return format_html(
            '<div class="box">'
            '<div class="box-drawing">{}</div>'
            '<div class="box-text" style="text-indent:{}px">{}</div>'
            '</div>',
            mark_safe(''.join(box_drawing)),
            (instance.depth - 1) * 30,
            instance,
        )