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switch to immer.js

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readme
brian 4 years ago
parent 8bac25ab2c
commit a248600c21
5 changed files with 44 additions and 84 deletions
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15
handlers/App.js
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@ -5,34 +5,35 @@ import api from '../api-stub.js';
const load_notes = function(state, dispatch){
api.post('/load-notes', {bin_id: state.bin.id})
.then(res=>{
dispatch({type: 'notes-loaded', notes: res.notes, bin_id: state.bin.id});
dispatch({type: 'notes-loaded', payload: res.notes});
});
};
const runSearch = function(state, dispatch){
api.post('/search', {search_term: state.search_term, sorting: state.sorting, bin_id: state.bin.id})
.then(res=>{
dispatch({type:'update-search-results', notes: res.notes});
dispatch({type:'update-search-results', payload: res.notes});
});
};
const new_note_handler = function(state, dispatch){
dispatch({type:'add-note', id: nanoid()});
dispatch({type:'add-note', payload:{id: nanoid(), date: Date.now()}});
};
const search_term_change_handler = function(state, dispatch, e){
if(e.code === 'Enter'){
runSearch(state, dispatch);
}
else{
dispatch({type:'update-search-term', search_term: e.target.value});
dispatch({type:'update-search-term', payload: e.target.value});
}
};
const sorting_change_handler = function(state, dispatch, e){
runSearch(state, dispatch);
dispatch({type:'update-sorting', sorting: e.target.value});
dispatch({type:'update-sorting', payload: e.target.value});
};
const new_bin_handler = function(state, dispatch){
const id = nanoid();
dispatch({type: 'new-bin', bin: {id}});
dispatch({type: 'notes-loaded', notes: [], bin_id: id});
// TODO: consolidate: this will cause two redraws:
dispatch({type: 'new-bin', payload:{id}});
dispatch({type: 'notes-loaded', payload: []});
};
export {new_note_handler, search_term_change_handler, sorting_change_handler, load_notes, new_bin_handler};

9
handlers/Note.js
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@ -2,19 +2,16 @@
import api from '../api-stub.js';
const edit_handler = function(note_state, dispatch){
dispatch({type: 'update-note-editing', note_id: note_state.note.id, is_editing: true});
dispatch({type: 'update-note-editing', payload:{id: note_state.note.id, is_editing: true}});
};
const cancel_handler = function(note_state, dispatch){
dispatch({type: 'update-note-editing', note_id: note_state.note.id, is_editing: false});
dispatch({type: 'update-note-editing', payload:{id: note_state.note.id, is_editing: false}});
};
const text_change_handler = function(note_state, dispatch, e){
note_state.temp_text = e.target.value;
};
const save_handler = function(note_state, dispatch){
// TODO: consolidate: this will cause two redraws:
dispatch({type: 'update-note-text', note_id: note_state.note.id, text: note_state.temp_text});
//note.text = temp_text;
dispatch({type: 'update-note-editing', note_id: note_state.note.id, is_editing: false});
dispatch({type: 'save-note-edit', payload:{id: note_state.note.id, text: note_state.temp_text}});
api.post('/save', {bin_id: note_state.bin_id, note_id: note_state.note.id, text: note_state.temp_text})
};

2
immer.min.js vendored
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File diff suppressed because one or more lines are too long

2
index.html
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@ -8,9 +8,9 @@
<!--<link rel="stylesheet" href="animate.min.css"></link>-->
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<!--<script src="./mithril.min.js"></script>-->
<script src="./mithril.min.js"></script>
<script src="./redux.min.js"></script>
<script src="./immer.min.js"></script>
</head>
<body>
<script type="module" src="./index.js"></script>

100
index.js
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@ -1,80 +1,40 @@
import App from './App.js';
import nanoid from './nanoid.min.js';
const produce = immer.produce;
immer.setAutoFreeze(false); // needed for high-frequency updated values, like onkeyup->note.temp_text; only once 'save' is called will it produce a new immutable state tree
var root = document.body;
function bin_reducer(old_state, new_state, action){
if(action.type === 'new-bin'){
new_state.bin = action.bin;
}
else{
new_state.bin = old_state.bin;
}
}
function search_reducer(old_state, new_state, action){
if(action.type === 'update-search-term'){
new_state.search_term = action.search_term;
}
else if(action.type === 'update-search-results'){
new_state.notes = action.notes.map(note=>({is_editing: false, temp_text: '', bin_id: old_state.bin.id, note}));
new_state.search_term = old_state.search_term;
}
else{
new_state.search_term = old_state.search_term;
}
}
function notes_reducer(old_state, new_state, action){
if(action.type === 'add-note'){
new_state.notes = ([{is_editing: true, temp_text: '', bin_id: old_state.bin.id, note: {id: action.id, text: '', modified: Date.now()}}]).concat(old_state.notes)
}
else if(action.type === 'notes-loaded'){
new_state.notes = action.notes.map(note=>({is_editing: false, temp_text: note.text, bin_id: action.bin_id, note}));
}
else if(action.type === 'update-note-text'){
const i = old_state.notes.findIndex(note_state => note_state.note.id === action.note_id);
new_state.notes = old_state.notes.slice();
new_state.notes[i] = {...new_state.notes[i], note: {...new_state.notes[i].note, text: action.text, modified: Date.now()}};
}
else if(action.type === 'update-note-editing'){
const i = old_state.notes.findIndex(note_state => note_state.note.id === action.note_id);
new_state.notes = old_state.notes.slice();
new_state.notes[i] = {...new_state.notes[i], is_editing: action.is_editing, temp_text: new_state.notes[i].note.text};
}
else{
new_state.notes = old_state.notes;
}
}
function sorting_reducer(old_state, new_state, action){
if(action.type === 'update-sorting'){
new_state.sorting = action.sorting;
}
else{
new_state.sorting = old_state.sorting;
}
}
function reducer(old_state, action){
const new_state = {};
bin_reducer(old_state, new_state, action);
notes_reducer(old_state, new_state, action);
search_reducer(old_state, new_state, action);
sorting_reducer(old_state, new_state, action);
return new_state;
}
/* Ruthlessly taken from [https://gist.github.com/kitze/fb65f527803a93fb2803ce79a792fff8]: */
const handleActions = (actionsMap, defaultState) =>
(state=defaultState, {type, payload}) =>
produce(state, draft => {
const action = actionsMap[type];
action && action(draft, payload);
});
const reducer = handleActions({
'new-bin': (s, bin) => s.bin=bin,
'update-search-term': (s, search_term) => { s.search_term=search_term; },
'update-search-results': (s, _notes) => { s.notes =_notes.map(n=>({is_editing: false, temp_text: '', bin_id: s.bin.id, note:n})); },
'add-note': (s, {id, date}) => { s.notes.unshift({is_editing: true, temp_text: '', bin_id: s.bin.id, note: {id: id, text: '', modified: date}}); },
'notes-loaded': (s, _notes) => { s.notes = _notes.map(n=>({is_editing: false, temp_text: n.text, bin_id: s.bin_id, note:n})); },
'update-note-text': (s, {id, text}) => { const note_s=s.notes.find(n=>n.note.id===id); note_s.note.text=text; }, // updates underlying note text (i.e. the "model", not the app note_state) "in the background" (e.g. from a server-pushed update), regardless of whether it's being edited; "save" is a separate action, below
'update-note-editing': (s, {id, is_editing}) => { const note_s=s.notes.find(n=>n.note.id===id); note_s.is_editing=is_editing; note_s.temp_text=note_s.note.text; },
'save-note-edit': (s, {id, text}) => { const note_s=s.notes.find(n=>n.note.id===id); note_s.note.text=text; note_s.temp_text=text; note_s.is_editing=false; },
'update-sorting': (s, sorting) => { s.sorting=sorting; }
}, {
bin: {id: nanoid()},
notes: [
//{is_editing: false, temp_text: '', bin_id: '', note: {id: nanoid(), text: 'Note one', modified: 1}},
],
search_term: '',
sorting: 'new->old'
//search_result_notes: []
});
// create Redux store, with Redux DevTools enabled:
const store = Redux.createStore(reducer, /* preloadedState, */ {
bin: {id: nanoid()},
notes: [
//{is_editing: false, temp_text: '', bin_id: '', note: {id: nanoid(), text: 'Note one', modified: 1}},
],
search_term: '',
sorting: 'new->old'
//search_result_notes: []
},
const store = Redux.createStore(reducer, /* preloadedState, */
window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__());
const dispatch = function(...args){ store.dispatch(...args); };

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