Checklist selector with Material-UI

MyChecklist.js

/**
 * Checklist selector with Material-UI
 * @author: Aderbal Nunes <[email protected]>
 * @since: 02/11/2019
 *
 * usage:
 * <MyChecklist 
 *    list={[
 *      {label: 'Foo', isChecked: false, id: 23},
 *      {label: 'Bar', isChecked: false, id: 44},
 *    ]}
 * />
 *
 * https://jsfiddle.net/aderbas/xeynLazj/
 */

import React, { PureComponent } from 'react';
import PropTypes from 'prop-types';
import {FormControlLabel,Box,Switch,Divider} from '@material-ui/core';

const ChooserDispatch = React.createContext(null);

function reducer(state, action){
  switch(action.type){
    case 'togglesingle':
      state.list = state.list.map(l => l.id === action.id?({...l, isChecked: !l.isChecked}):l);
      // changes to parent
      if(action.ch && typeof action.ch === 'function'){
        action.ch(state.list);
      }
      return {
        ...state,
        checked: state.list.every(l => l.isChecked),
      };       
    case 'toggleall':
      state.checked = !state.checked;
      state.list = state.list.map(l => ({...l, isChecked: state.checked}));
      // changes to parent
      if(action.ch && typeof action.ch === 'function'){
        action.ch(state.list);
      }
      return {
        ...state
      };
    case 'update':
      return {
        ...state,
        list: action.list
      };      
    default:
      throw new Error();
  }
}

/**
 * Confirm all
 */
const ConfirmAll = ({...props}) => {
  const dispatch = React.useContext(ChooserDispatch);
  const {state,onChange} = props;

  const checkAll = () => {
    dispatch({type: 'toggleall', ch: onChange});
  };

  return (
    <React.Fragment>
      <FormControlLabel 
        label="Check all"
        control={
          <Switch 
            checked={state.checked}
            onChange={checkAll}
          />
        }
      />
      <Divider />
    </React.Fragment>
  )
};

/**
 * Render switch component
 */
const SingleSwitch = ({...props}) => {
  const dispatch = React.useContext(ChooserDispatch);
  const {item,onChange} = props;

  const onCheck = () => {
    dispatch({type: 'togglesingle', id: item.id, ch: onChange});
  };

  return (
    <Switch 
      checked={item.isChecked}
      onChange={onCheck}
    />
  )
};

/**
 * Render component
 */
const Render = ({...props}) => {
  const [state, dispatch] = React.useReducer(reducer, {
    checked: false,
    list: props.list
  });
  const {onChange,list} = props;
  
  React.useEffect(() => { 
    dispatch({type: 'update', list: list});
  }, [list]);
  
  if(!state.list || state.list.length <= 0){
    return null
  }

  return (
    <ChooserDispatch.Provider value={dispatch}>

      <ConfirmAll state={state} />

      {state.list.map((current,k) => {
        return (
          <div key={k}>
            <FormControlLabel
              onClick={() => onChange(current)}
              control={
                <SingleSwitch 
                  item={current}
                />
              }
              label={current.label}
            />
          </div>
        );
      })}
    </ChooserDispatch.Provider>
  );
}

/**
 * Main class
 */
class MyChecklist extends PureComponent{

  render(){
    const {list, ...others} = this.props;
    
    if(list.length <= 0) return null;

    return (
      <Render 
        list={list}
        {...others}
      />
    );
  };
}

MyChecklist.propTypes = {
  list: PropTypes.array.isRequired,
};

export default MyChecklist;