комбинированный список в Pygame, Python 2,7

Question

Как создавать комбо-боксы в pygame (python 2.7)

Я не хочу использовать tk, wx или любой другой графический интерфейс, просто pygame.

import pygame


class ComboBox(pygame):
    def __init__(self, items, editable, dropdownWidth, width, value):
        self.items = items
        self.editable = editable  # True, the user can type a new value False, the user can only choose from the options
        self.dropdownwidth = dropdownWidth
        self.width = width
        self.value = value # i dont think there is need to

    def onSelChange(self, selection):
        pass

    def onEditChange(self, text):
        pass

    def onFocus(self, focused):
        pass

    def onEnter(self):
        pass

    def refresh(self):
        pass