From d563cb32b6fdb7f4ab49b635b35be50009e501e0 Mon Sep 17 00:00:00 2001
From: Chris Kobrzak <chris.kobrzak@gmail.com>
Date: Wed, 9 Sep 2015 13:16:15 +0100
Subject: [PATCH] Add Todos widget implemented in Redux

---
 index.html             |  4 +++
 src/app.js             | 17 +++++++++++
 src/flux/actions.js    | 24 +++++++++++++++
 src/flux/reducers.js   | 42 +++++++++++++++++++++++++
 src/todos/AddTodo.jsx  | 37 ++++++++++++++++++++++
 src/todos/App.jsx      | 69 ++++++++++++++++++++++++++++++++++++++++++
 src/todos/Footer.jsx   | 51 +++++++++++++++++++++++++++++++
 src/todos/Todo.jsx     | 33 ++++++++++++++++++++
 src/todos/TodoList.jsx | 24 +++++++++++++++
 9 files changed, 301 insertions(+)
 create mode 100644 src/flux/actions.js
 create mode 100644 src/flux/reducers.js
 create mode 100644 src/todos/AddTodo.jsx
 create mode 100644 src/todos/App.jsx
 create mode 100644 src/todos/Footer.jsx
 create mode 100644 src/todos/Todo.jsx
 create mode 100644 src/todos/TodoList.jsx

diff --git a/index.html b/index.html
index df9680c..c45b9bb 100644
--- a/index.html
+++ b/index.html
@@ -8,9 +8,13 @@
 
   <div id="heading-container"></div>
 
+  <div id="notes-container"></div>
+
   <a href="/pages/page1.html">Page #1</a>
   <a href="/pages/page1.html">Page #2</a>
 
+  <!-- Required by Safari -->
+  <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.23/browser-polyfill.min.js"></script>
   <script type="text/javascript" src="http://localhost:5000/assets/build.js"></script>
 
 </body>
diff --git a/src/app.js b/src/app.js
index e35a639..c134a8e 100644
--- a/src/app.js
+++ b/src/app.js
@@ -7,5 +7,22 @@ import Book from './book/book.js';
 import Section from './book/section.jsx';
 React.render( <Section />, document.getElementById( 'heading-container' ) );
 
+import { createStore } from 'redux';
+import { Provider } from 'react-redux';
+import todoApp from './flux/reducers';
+import Todos from './todos/App.jsx'; // eslint-disable-line no-unused-vars
+
+let store = createStore(todoApp);
+
+let rootElement = document.getElementById('notes-container');
+React.render(
+  // The child must be wrapped in a function
+  // to work around an issue in React 0.13.
+  <Provider store={store}>
+    {() => <Todos />}
+  </Provider>,
+  rootElement
+);
+
 var book = new Book();
 book.logSomething();
diff --git a/src/flux/actions.js b/src/flux/actions.js
new file mode 100644
index 0000000..e276862
--- /dev/null
+++ b/src/flux/actions.js
@@ -0,0 +1,24 @@
+// action types
+export const ADD_TODO = 'ADD_TODO'
+export const COMPLETE_TODO = 'COMPLETE_TODO'
+export const SET_VISIBILITY_FILTER = 'SET_VISIBILITY_FILTER'
+
+// other constants
+export const VisibilityFilters = {
+  SHOW_ALL: 'SHOW_ALL',
+  SHOW_COMPLETED: 'SHOW_COMPLETED',
+  SHOW_ACTIVE: 'SHOW_ACTIVE'
+}
+
+// action creators
+export function addTodo(text) {
+  return { type: ADD_TODO, text }
+}
+
+export function completeTodo(index) {
+  return { type: COMPLETE_TODO, index }
+}
+
+export function setVisibilityFilter(filter) {
+  return { type: SET_VISIBILITY_FILTER, filter }
+}
diff --git a/src/flux/reducers.js b/src/flux/reducers.js
new file mode 100644
index 0000000..108b928
--- /dev/null
+++ b/src/flux/reducers.js
@@ -0,0 +1,42 @@
+import { combineReducers } from 'redux'
+import { ADD_TODO, COMPLETE_TODO, SET_VISIBILITY_FILTER, VisibilityFilters }
+  from './actions'
+const { SHOW_ALL } = VisibilityFilters
+
+function visibilityFilter(state = SHOW_ALL, action) {
+  // TODO Switch statements are a no-no
+  switch (action.type) {
+    case SET_VISIBILITY_FILTER:
+      return action.filter
+    default:
+      return state
+  }
+}
+
+function todos(state = [], action) {
+  // TODO Switch statements are a no-no
+  switch (action.type) {
+    case ADD_TODO:
+      return [...state, {
+        text: action.text,
+        completed: false
+      }]
+    case COMPLETE_TODO:
+      return [
+        ...state.slice(0, action.index),
+        Object.assign( {}, state[action.index], {
+          completed: true
+        }),
+        ...state.slice(action.index + 1)
+      ]
+    default:
+      return state
+  }
+}
+
+const todoApp = combineReducers({
+  visibilityFilter,
+  todos
+})
+
+export default todoApp
diff --git a/src/todos/AddTodo.jsx b/src/todos/AddTodo.jsx
new file mode 100644
index 0000000..7be2af7
--- /dev/null
+++ b/src/todos/AddTodo.jsx
@@ -0,0 +1,37 @@
+import React from 'react'
+
+export default class AddTodo extends React.Component {
+
+  constructor(props) {
+    super(props)
+    this.bindInstanceMethods( "handleClick" )
+  }
+
+  bindInstanceMethods( ...methods ) {
+    methods.forEach(
+      ( method ) => this[ method ] = this[ method ].bind( this )
+    )
+  }
+
+  render() {
+    return (
+      <div>
+        <input type="text" ref="input" />
+        <button onClick={this.handleClick}>
+          Add
+        </button>
+      </div>
+    )
+  }
+
+  handleClick( event ) {
+    let node = React.findDOMNode( this.refs.input )
+    let text = node.value.trim()
+    this.props.onAddClick( text )
+    node.value = ''
+  }
+}
+
+AddTodo.propTypes = {
+  onAddClick: React.PropTypes.func.isRequired
+}
diff --git a/src/todos/App.jsx b/src/todos/App.jsx
new file mode 100644
index 0000000..8de9f9b
--- /dev/null
+++ b/src/todos/App.jsx
@@ -0,0 +1,69 @@
+import React from "react"
+import { connect } from 'react-redux'
+import { addTodo, completeTodo, setVisibilityFilter, VisibilityFilters }
+  from '../flux/actions'
+import AddTodo from './AddTodo.jsx'
+import TodoList from './TodoList.jsx'
+import Footer from './Footer.jsx'
+
+class App extends React.Component {
+
+  render() {
+    // Injected by connect() call:
+    const { dispatch, visibleTodos, visibilityFilter } = this.props
+    return (
+      <div>
+        <AddTodo
+          onAddClick={text =>
+            dispatch( addTodo( text ) )
+          } />
+        <TodoList
+          todos={visibleTodos}
+          onTodoClick={index => {
+            dispatch( completeTodo( index ) )
+          }} />
+        <Footer
+          filter={visibilityFilter}
+          onFilterChange={nextFilter =>
+            dispatch( setVisibilityFilter( nextFilter ) )
+          } />
+      </div>
+    )
+  }
+}
+
+App.propTypes = {
+  visibleTodos: React.PropTypes.arrayOf( React.PropTypes.shape({
+    text: React.PropTypes.string.isRequired,
+    completed: React.PropTypes.bool.isRequired
+  }) ),
+  visibilityFilter: React.PropTypes.oneOf([
+    'SHOW_ALL',
+    'SHOW_COMPLETED',
+    'SHOW_ACTIVE'
+  ]).isRequired
+}
+
+function selectTodos(todos, filter) {
+  // TODO Switch statements are a no-no
+  switch ( filter ) {
+    case VisibilityFilters.SHOW_ALL:
+      return todos
+    case VisibilityFilters.SHOW_COMPLETED:
+      return todos.filter( todo => todo.completed )
+    case VisibilityFilters.SHOW_ACTIVE:
+      return todos.filter( todo => !todo.completed )
+  }
+}
+
+// Which props do we want to inject, given the global state?
+// Note: use https://github.com/faassen/reselect for better performance.
+function select(state) {
+  return {
+    visibleTodos: selectTodos( state.todos, state.visibilityFilter ),
+    visibilityFilter: state.visibilityFilter
+  }
+}
+
+// Wrap the component to inject dispatch and state into it
+export default connect( select )( App )
diff --git a/src/todos/Footer.jsx b/src/todos/Footer.jsx
new file mode 100644
index 0000000..fa93511
--- /dev/null
+++ b/src/todos/Footer.jsx
@@ -0,0 +1,51 @@
+import React from 'react'
+
+export default class Footer extends React.Component {
+
+  constructor(props) {
+    super(props)
+  }
+
+  render() {
+    return (
+      <p>
+        Show:
+        {' '}
+        {this.renderFilter('SHOW_ALL', 'All')}
+        {', '}
+        {this.renderFilter('SHOW_COMPLETED', 'Completed')}
+        {', '}
+        {this.renderFilter('SHOW_ACTIVE', 'Active')}
+        .
+      </p>
+    )
+  }
+
+  renderFilter(filter, name) {
+    if (filter === this.props.filter) {
+      return name
+    }
+
+    return (
+      // Please note the currying technique we use below
+      <a href="#" onClick={ this.handleClick.bind( this, filter ) }>
+        {name}
+      </a>
+    )
+  }
+
+  handleClick( filter, event ) {
+    event.preventDefault()
+    this.props.onFilterChange( filter )
+  }
+
+}
+
+Footer.propTypes = {
+  onFilterChange: React.PropTypes.func.isRequired,
+  filter: React.PropTypes.oneOf([
+    'SHOW_ALL',
+    'SHOW_COMPLETED',
+    'SHOW_ACTIVE'
+  ]).isRequired
+}
diff --git a/src/todos/Todo.jsx b/src/todos/Todo.jsx
new file mode 100644
index 0000000..fa6512d
--- /dev/null
+++ b/src/todos/Todo.jsx
@@ -0,0 +1,33 @@
+import React from "react"
+
+export default class Todo extends React.Component {
+
+  render() {
+    let textDecoration, cursor
+
+    if ( this.props.completed ) {
+      textDecoration = 'line-through'
+      cursor = 'default'
+    } else {
+      textDecoration = 'none'
+      cursor = 'pointer'
+    }
+
+    return (
+      <li
+        onClick={this.props.onClick}
+        style={{
+          textDecoration: textDecoration,
+          cursor: cursor
+        }}>
+        {this.props.text}
+      </li>
+    )
+  }
+}
+
+Todo.propTypes = {
+  onClick: React.PropTypes.func.isRequired,
+  text: React.PropTypes.string.isRequired,
+  completed: React.PropTypes.bool.isRequired
+}
diff --git a/src/todos/TodoList.jsx b/src/todos/TodoList.jsx
new file mode 100644
index 0000000..055a622
--- /dev/null
+++ b/src/todos/TodoList.jsx
@@ -0,0 +1,24 @@
+import React from "react"
+import Todo from './Todo.jsx'
+
+export default class TodoList extends React.Component {
+  render() {
+    return (
+      <ul>
+        {this.props.todos.map( (todo, index) =>
+          <Todo {...todo}
+            key={index}
+            onClick={ () => this.props.onTodoClick(index) } />
+        )}
+      </ul>
+    )
+  }
+}
+
+TodoList.propTypes = {
+  onTodoClick: React.PropTypes.func.isRequired,
+  todos: React.PropTypes.arrayOf( React.PropTypes.shape({
+    text: React.PropTypes.string.isRequired,
+    completed: React.PropTypes.bool.isRequired
+  }).isRequired ).isRequired
+}