pages.py

import pygame
import pygameMenu
import flatpakmanager_steamos
import pyflatpak
import math

pygame.init()
pygame.joystick.init()
joysticks = [pygame.joystick.Joystick(x) for x in range(pygame.joystick.get_count())]
for joystick in joysticks:
    joystick.init()

display_list = range(49)
page = 1
page_size = 5
window_width = 1280
window_height = 720
window =  pygame.display.set_mode((window_width, window_height))

def get_page_content():
    global page_size
    global page
    global display_list
    global window
    global window_width
    global window_height

    output = []

    first_index = page_size * (page - 1)
    last_index = first_index + page_size

    for index in range(first_index, last_index):
        if not index < len(display_list):
            break
        output.append(display_list[index])
    print(output)
    return output

def create_menu(label=None, page_new=None):
    global page_size
    global page
    global display_list

    menu = pygameMenu.Menu(window, window_width, window_height,
                           pygameMenu.font.FONT_OPEN_SANS, "Paged Menu",
                           dopause=False
                           )

    # change the page
    if page_new:
        print(page_new)
        page = page_new

    last_page = len(display_list) / page_size + 1

    # make the page selector
    page_list = []
    for number in range(1, last_page + 1):
        page_list.append(("Page {}/{}".format(number, last_page), number))
    menu.add_selector("", page_list, onchange=create_menu,
                      selector_id='page_selector{}'.format(page))

    # add buttons
    for entry in get_page_content():
        menu.add_option("{}".format(entry), pygameMenu.events.EXIT)

    return menu

menu = create_menu()

while True:
    menu.mainloop()