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#!/usr/bin/env python
from typing import Optional
from typing import Callable
from typing import List
from doorstop import common
from doorstop.gui.action import Action
from doorstop.gui.state import State
from doorstop.gui.reducer import Reducer
log = common.logger(__name__)
class Store():
@property
def state(self) -> Optional[State]:
return self.__state
def __init__(self, reducer: Reducer, initial_state: Optional[State] = None) -> None:
self.__observer = [] # type: List[Callable[["Store"], None]]
self.__state = initial_state
self.__reducer = reducer
def add_observer(self, observer: Callable[["Store"], None]) -> None:
self.__observer.append(observer)
observer(self)
def remove_observer(self, observer: Callable[["Store"], None]) -> None:
self.__observer.remove(observer)
def dispatch(self, action: Action) -> None:
new_state = self.__reducer.reduce(self.state, action)
if new_state != self.__state:
log.info(action.__class__.__name__)
self.__state = new_state
for curr_observer in self.__observer:
curr_observer(self)
jacebrowning /
doorstop
