#### Some Python code

from dataclasses import dataclass
from enum import Enum
from typing import Union


class ButtonType(Enum):
    color_sel = 1
    room_sel = 2

class HSV(Enum):
    h = 1
    s = 2
    v = 3

# [1] Opaque payload

@dataclass
class HSVColorPayload:
    type: HSV
    value: int

@dataclass
class RoomPayload:
    room_no: int  # Enum in actual life

@dataclass
class ButtonEvent:
    btype: ButtonType
    payload: Union[HSVColorPayload, RoomPayload]

def do_color_sel(p: HSVColorPayload): pass
def do_color_sel(p: RoomPayload): pass

def process_button_event(e: ButtonEvent) -> None:
    handlers = {
        ButtonType.color_sel: do_color_sel,
        ButtonType.room_sel: do_room_self,
    }
    handler = handler[e.btype]
    handler(e.payload)

# [1] Subclassing

@dataclass
class ButtonEvent:
    btype: ButtonType

@dataclass
class ColorEvent(ButtonEvent):
    type: HSV
    value: int

@dataclass
class RoomEvent(ButtonEvent):
    room_no: int

def do_color_sel(e: ColorEvent): pass
def do_color_sel(e: RoomEvent): pass

def process_button_event(e: ButtonEvent) -> None:
    handlers = {
        ButtonType.color_sel: do_color_sel,
        ButtonType.room_sel: do_room_self,
    }
    handler = handler[e.btype]
    handler(e)