Observable

Mixin: notifies when fields change; auto-wraps lists/dicts to be observable.

Example

import flet as ft
from dataclasses import dataclass


@ft.observable
@dataclass
class MyDataClass:
    x: int
    y: int


obj = MyDataClass(1, 2)


def listener(sender, field):
    print(f"Changed: {field} in {sender}")


obj.subscribe(listener)
obj.x = 3
obj.y = 4

Methods

• notify –

  Manually notify listeners that something changed.

• subscribe –

  Register a change listener.

Methods

notify

notify()

Manually notify listeners that something changed.

subscribe

subscribe(fn: Listener) -> Callable[[], None]

Register a change listener.

Parameters:

• fn (Listener) –

  Listener callback receiving (sender, field).

Returns:

• Callable[[], None] –

  A disposer function that unsubscribes the listener.