paged keyboard for aiogram3

paged_keyboard.py

COUNT_ON_PAGE = 10
COUNT_ON_LINE = 2

def get_paged_keyboard(data: list[str], page=1):
    pages_count = math.ceil(len(data) / COUNT_ON_PAGE)
    page = page % pages_count
    cluster = data[(page - 1) * COUNT_ON_PAGE:page * COUNT_ON_PAGE]

    builder = InlineKeyboardBuilder()
    for i, el in enumerate(cluster):
        builder.button(text=el, callback_data='')

    builder.adjust(COUNT_ON_LINE)

    left_button = InlineKeyboardButton(text="◀️", callback_data=TurnPageCallbackData(
        page=page - 1 if page > 1 else pages_count).pack())

    right_button = InlineKeyboardButton(text="▶️", callback_data=TurnPageCallbackData(
        page=page + 1 if page < pages_count else 1).pack())

    info_button = InlineKeyboardButton(text=f'({page}/{pages_count})', callback_data='stub')

    builder.row(left_button, info_button, right_button)

    return builder.as_markup()


class TurnPageCallbackData(CallbackData, prefix='turn'):
    page: int