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# --------------------------------------------------------------------------------------
# Copyright (c) 2022-2024, Nucleic Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file LICENSE, distributed with this software.
# --------------------------------------------------------------------------------------
"""Demonstration of the use of static and dynamic observers."""
from typing import Optional
from atom.api import Atom, ChangeDict, observe
class Dog(Atom):
name: str
class Person(Atom):
"""A simple class representing a person object."""
name: str
age: int
dog: Optional[Dog]
def _observe_age(self, change: ChangeDict) -> None:
print("Age changed: {0}".format(change["value"]))
@observe("name")
def any_name_i_want(self, change: ChangeDict) -> None:
print("Name changed: {0}".format(change["value"]))
@observe("dog.name")
def another_random_name(self, change: ChangeDict) -> None:
print("Dog name changed: {0}".format(change["value"]))
def main() -> None:
bob = Person(name="Robert Paulson", age=40)
bob.name = "Bobby Paulson"
bob.age = 50
bob.dog = Dog(name="Scruffy")
def watcher_func(change: ChangeDict) -> None:
print("Watcher func change: {0}".format(change["value"]))
bob.observe("age", watcher_func)
bob.age = 51
bob.unobserve("age", watcher_func)
bob.age = 52 # No call to watcher func
if __name__ == "__main__":
main()
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