Created
November 24, 2017 17:20
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An idea for a simple component-based state manager
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import { Component } from 'react'; | |
class Keeper extends Component{ | |
static defaultProps = { | |
initialState:{}, | |
stateRoot:'keeper', | |
reducer:state=>state, | |
serialize:null | |
} | |
constructor(props){ | |
super(props); | |
this.state = {[props.stateRoot]: props.initialState}; | |
} | |
__getState = ()=>{ | |
return this.state[this.props.stateRoot] | |
} | |
__setState = (newState)=>{ | |
this.setState({...this.state,[this.props.stateRoot]:newState},this.__serialize); | |
} | |
__serialize = ()=>{ | |
if (typeof this.props.serialize === 'function') { | |
this.props.serialize(this.__getState()); | |
} | |
} | |
__dispatch = action => this.__setState(this.props.reducer(this.__getState(), action)); | |
render(){ | |
return this.props.children( | |
this.__getState, | |
this.__dispatch | |
); | |
} | |
} | |
export default Keeper; |
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import React, { Component } from 'react'; | |
import Keeper from './keeper'; | |
import Storage from '../utils/storage'; | |
import generateID from '../utils/id'; | |
import {LocalDate} from 'js-joda'; | |
import {STATUS_DONE, STATUS_PENDING} from '../utils/constants'; | |
const createTodo = newTodo => ({ | |
type:'NEW_TODO', | |
payload:{ | |
id:generateID('todo'), | |
title:newTodo, | |
status:STATUS_PENDING, | |
meta:{} | |
} | |
}); | |
const toggleDoneStatus = ({id}) => ({ | |
type:'UPDATE_TODO_STATUS', | |
payload:{ | |
id, | |
// status:STATUS_DONE | |
} | |
}); | |
class TodosKeeper extends Component { | |
static defaultProps = { | |
listKey:LocalDate.now() | |
} | |
vault = new Storage('KEEPER::TODOS'); | |
reducer = (state, action)=>{ | |
if (action.type === 'NEW_TODO') { | |
return [...state, action.payload]; | |
} | |
if (action.type === 'UPDATE_TODO_STATUS') { | |
const {id} = action.payload; | |
const index = state.findIndex(item => item.id === id ); | |
const item = state[index]; | |
const status = item.status === STATUS_DONE ? STATUS_PENDING : (STATUS_PENDING) ? STATUS_DONE : item.status; | |
if (item) { | |
return [ | |
...state.slice(0,index), | |
{...item, status}, | |
...state.slice(index+1), | |
]; | |
} | |
} | |
return state; | |
} | |
// componentWillReceiveProps | |
getListKey = ()=>{ | |
return this.props.listKey; | |
} | |
serialize = (todos) => { | |
this.vault.setItem(this.getListKey(),todos); | |
} | |
unserialize = initial => { | |
return this.vault.getItem(this.getListKey(), []); | |
} | |
render() { | |
window.TODO_KEEPER = this; | |
console.log('WTF',this.props); | |
// console.log(this.vault.unserialize()); | |
return ( | |
<Keeper initialState={this.unserialize([])} reducer={this.reducer} serialize={this.serialize} ref={ keeper => this.keeper = keeper }> | |
{(getState, dispatch)=>{ | |
const onCreate = todo => dispatch(createTodo(todo)); | |
const onToggleDoneStatus = todo => dispatch(toggleDoneStatus(todo)); | |
// window.dispatch = dispatch; | |
return this.props.children({todos:getState(), onCreate, onToggleDoneStatus}); | |
}} | |
</Keeper> | |
); | |
} | |
} | |
export default TodosKeeper; |
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