Chapter one

awesome_owl/static/src/card/card.js

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+import { Component, useState } from "@odoo/owl";
+
+export class Card extends Component {
+    static props = {
+        label: {type: String},
+        slots: {
+            type: Object,
+            shape: {
+                default: Object,
+            },
+            optional: true,
+        },
+    };
+    static template = "awesome_owl.card";
+
+    setup() {
+        this.state = useState({
+            showContent: true,
+        })
+    }
+
+    toggleShowContent() {
+        this.state.showContent = !this.state.showContent;
+    }
+}

awesome_owl/static/src/card/card.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<templates xml:space="preserve">
+    <t t-name="awesome_owl.card">
+        <div class="card d-inline-block m-2" style="width: 18rem;">
+            <div class="card-header">
+                <h5 class="card-title"><t t-esc="props.label"/> <button t-on-click="toggleShowContent">Toggle</button></h5>
+
+            </div>
+            <div t-if="state.showContent" class="card-body">
+                <p class="card-text">
+                    <t t-slot="default"/>
+                </p>
+            </div>
+        </div>
+    </t>
+</templates>

awesome_owl/static/src/counter/counter.js

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+import { Component, useState } from "@odoo/owl";
+
+export class Counter extends Component {
+    static props = {
+        onChange: {optional: true}
+    };
+    static template = "awesome_owl.counter";
+
+    setup() {
+        this.state = useState({ counter: 0 });
+    }
+
+    increment() {
+        this.state.counter++;
+        if (this.props.onChange) {
+            this.props.onChange();
+        }
+    }
+}

awesome_owl/static/src/counter/counter.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<templates xml:space="preserve">
+
+    <t t-name="awesome_owl.counter">
+        <button class="btn btn-primary" t-on-click="increment">&lt; <t t-esc="state.counter"/> &gt;</button>
+    </t>
+
+</templates>

awesome_owl/static/src/playground.js

@@ -1,5 +1,28 @@
-import { Component } from "@odoo/owl";
+import { Component, markup, useState } from "@odoo/owl";
+import { Counter } from "./counter/counter";
+import { Card } from "./card/card";
+import { TodoList } from "./todo/todo_list";
 
 export class Playground extends Component {
+    static props = [];
     static template = "awesome_owl.playground";
+    static components = {
+        Counter,
+        Card,
+        TodoList,
+    };
+
+    content1 = markup("<b>This is the content for card 1</b>");
+
+    setup() {
+        super.setup();
+        this.state = useState({
+            total: 0,
+        });
+    }
+
+    onCounterIncremeneted = () => {
+        console.log(this.state)
+        this.state.total ++;
+    }
 }

awesome_owl/static/src/playground.xml

@@ -2,9 +2,14 @@
 <templates xml:space="preserve">
 
     <t t-name="awesome_owl.playground">
-        <div class="p-3">
-            hello world
-        </div>
+        <Card label="'Counter 1'">
+            <Counter onChange="onCounterIncremeneted"/>
+        </Card> VS 
+        <Card label="'Counter 2'">
+            <Counter onChange="onCounterIncremeneted"/>
+        </Card>
+        <div><Card label="'Total Count'"><p>Bienvenue</p></Card></div>
+        <div><TodoList/></div>
     </t>
 
 </templates>

awesome_owl/static/src/todo/todo_item.js

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+import { Component, markup, useState } from "@odoo/owl";
+import { Card } from "../card/card"
+
+export class TodoItem extends Component {
+    static props = {
+        todo: {
+            type: Object, 
+            shape: {
+                id: {type: Number},
+                description: {type: String},
+                isCompleted: {type: Boolean},
+            }
+        },
+        toggleState: {type: Function},
+        handleDeleteTodo: {type: Function},
+    };
+
+    static components = {
+        Card,
+    };
+
+    static template = "awesome_owl.todo_item";
+
+    onToggleChange = () => {
+        this.props.toggleState(this.props.todo.id);
+    }
+
+    onDelete = () => {
+        this.props.handleDeleteTodo(this.props.todo.id);
+    }
+}

awesome_owl/static/src/todo/todo_item.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<templates xml:space="preserve">
+
+    <t t-name="awesome_owl.todo_item">
+        <div t-att-class="{
+                'text-muted text-decoration-line-through': props.todo.isCompleted
+            }">
+            <input type="checkbox" t-on-click="onToggleChange" />
+            <t t-esc="props.todo.id"/>. <t t-esc="props.todo.description"/>
+            <span class="fa fa-remove" t-on-click="onDelete"/>
+        </div>
+    </t>
+
+</templates>

awesome_owl/static/src/todo/todo_list.js

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+import { Component, markup, useState, onMounted, useRef } from "@odoo/owl";
+import { TodoItem } from "./todo_item";
+import { useAutofocus } from "../utils"
+
+export class TodoList extends Component {
+    static components = {
+        TodoItem,
+    };
+
+    static template = "awesome_owl.todo_list";
+
+    setup() {
+        this.todos = useState([]);
+        useAutofocus('todo_input');
+        this.nextId = 0;
+    }
+
+    createTodo = (ev) => {
+        if (ev.keyCode != 13)
+            return;
+
+        const text = ev.target.value.trim();
+
+        if (!text)
+            return;
+
+        this.todos.push({
+            id: ++this.nextId,
+            description: text,
+            isCompleted: false,
+        });
+
+        ev.target.value = "";
+    }
+
+    handleTodoStateChanged = (todoId) => {
+        const toChange = this.todos.find(t => t.id == todoId);
+        toChange.isCompleted = !toChange.isCompleted;
+    }
+
+    handleDeleteTodo = (todoId) => {
+        const index = this.todos.findIndex(t => t.id === todoId);
+        if (index !== -1) {
+            this.todos.splice(index, 1);
+        }
+    }
+}

awesome_owl/static/src/todo/todo_list.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<templates xml:space="preserve">
+
+    <t t-name="awesome_owl.todo_list">
+        <input type="text"
+            id="todo_input"
+            t-ref="todo_input"
+            placeholder="Add a todo"
+            t-on-keyup="createTodo"
+        />
+        <t t-foreach="todos" t-as="todo" t-key="todo.id">
+            <TodoItem 
+                todo="todo" 
+                toggleState="handleTodoStateChanged"
+                handleDeleteTodo="handleDeleteTodo" 
+            />
+        </t>
+    </t>
+
+</templates>

awesome_owl/static/src/utils.js

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+import { useRef, onMounted } from "@odoo/owl"
+
+export function useAutofocus(refName) {
+    const ref = useRef(refName);
+
+    onMounted(() => {
+        if (ref.el)
+            ref.el.focus();
+    })
+}