grid.py 文件源码

def layout(self, width):
        self.__width = width
        surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 1, 1)
        ctx = cairo.Context(surface)
        line_height = 0
        total_height = self.__padding
        line_used = self.__padding
        for legend in self.__legends:
            (t_width, t_height) = ctx.text_extents(legend)[2:4]
            item_width = self.__padding + self.__padding + t_width + self.__padding
            item_height = t_height + self.__padding
            if item_height > line_height:
                line_height = item_height
            if line_used + item_width > self.__width:
                line_used = self.__padding + item_width
                total_height += line_height
            else:
                line_used += item_width
            x = line_used - item_width
        total_height += line_height
        self.__height = total_height