[IMP] playground: add a new sample

docs/playground/playground.js

@@ -99,6 +99,11 @@ const SAMPLES = [
     folder: "todo_app",
     code: ["js", "xml", "css"],
   },
+  {
+    description: "Tic-Tac-Toe (with reactivity)",
+    folder: "tic_tac_toe",
+    code: ["js", "xml", "css"],
+  },
   {
     description: "Responsive app",
     folder: "responsive_app",

docs/playground/samples/tic_tac_toe/tic_tac_toe.css

@@ -0,0 +1,32 @@
+.square {
+    background: #fff;
+    border: 1px solid #999;
+    float: left;
+    font-size: 24px;
+    font-weight: bold;
+    line-height: 34px;
+    height: 34px;
+    margin-right: -1px;
+    margin-top: -1px;
+    padding: 0;
+    text-align: center;
+    width: 34px;
+}
+
+.board-row:after {
+    clear: both;
+    content: '';
+    display: table;
+}
+
+.status {
+    margin-bottom: 10px;
+}
+.game {
+    display: flex;
+    flex-direction: row;
+}
+
+.game-info {
+    margin-left: 20px;
+}

docs/playground/samples/tic_tac_toe/tic_tac_toe.js

@@ -0,0 +1,105 @@
+// This example is an implementation of the Tic-Tac-Toe game, from
+// https://react.dev/learn/tutorial-tic-tac-toe.  This is an easy application to start learning owl
+// with some interesting user interactions.
+//
+// In this implementation, we use the owl reactivity mechanism.
+import { Component, useState, mount } from "@odoo/owl";
+
+
+class Square extends Component {
+    static template = "Square";
+}
+
+class Board extends Component {
+    static template = "Board"
+    static components = { Square };
+
+    handleClick(i) {
+        if (this.calculateWinner(this.props.squares) || this.props.squares[i]) {
+          return;
+        }
+        const nextSquares = this.props.squares.slice();
+        if (this.props.xIsNext) {
+          nextSquares[i] = 'X';
+        } else {
+          nextSquares[i] = 'O';
+        }
+        this.props.onPlay(nextSquares);
+    }
+
+    get status(){
+        const winner = this.calculateWinner(this.props.squares);
+        if (winner) {
+          return 'Winner: ' + winner;
+        } else {
+            if (Object.values(this.props.squares).filter((v) => v === null).length > 0)
+                return 'Next player: ' + (this.props.xIsNext ? 'X' : 'O');
+            else 
+                return 'Draw';
+        }
+    }
+
+    calculateWinner(squares) {
+        const lines = [
+          [0, 1, 2],
+          [3, 4, 5],
+          [6, 7, 8],
+          [0, 3, 6],
+          [1, 4, 7],
+          [2, 5, 8],
+          [0, 4, 8],
+          [2, 4, 6],
+        ];
+        for (let i = 0; i < lines.length; i++) {
+          const [a, b, c] = lines[i];
+          if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
+            return squares[a];
+          }
+        }
+        return null;
+      }
+}  
+
+class Game extends Component {
+    static template = "Game"
+    static components = { Board };
+
+    setup() {
+        this.state = useState({
+            currentMove: 0,
+            history: [Array(9).fill(null)],
+        });
+    }
+
+    get currentSquares() {
+        return this.state.history[this.state.currentMove];
+    }
+
+    get xIsNext() {
+        return this.state.currentMove % 2 === 0;
+    }
+
+    jumpTo(nextMove) {
+        this.state.currentMove = nextMove;
+    }
+
+    handlePlay(nextSquares) {
+        const nextHistory = [...this.state.history.slice(0, this.state.currentMove + 1), nextSquares];
+        this.state.history = nextHistory;
+        this.state.currentMove = this.state.history.length - 1;
+    }
+
+    get moves() {
+        return this.state.history.map((_squares, move) => {
+            if (move > 0) {
+              return {id: move, description: 'Go to move #' + move};
+            } else {
+              return {id: move, description: 'Go to game start'};
+            }
+        });
+    }
+
+}
+
+// Application setup
+mount(Game, document.body, { templates: TEMPLATES, dev: true});

docs/playground/samples/tic_tac_toe/tic_tac_toe.xml

@@ -0,0 +1,43 @@
+<templates>
+    <button t-name="Square" class="square" t-on-click="props.onSquareClick">
+        <t t-esc="props.value"/>
+    </button>
+
+    <t t-name="Board">
+        <div class="status">
+            <t t-esc="status"/>
+        </div>
+        <div class="board-row">
+            <Square value="props.squares[0]" onSquareClick="() => this.handleClick(0)" />
+            <Square value="props.squares[1]" onSquareClick="() => this.handleClick(1)" />
+            <Square value="props.squares[2]" onSquareClick="() => this.handleClick(2)" />
+        </div>
+        <div class="board-row">
+            <Square value="props.squares[3]" onSquareClick="() => this.handleClick(3)" />
+            <Square value="props.squares[4]" onSquareClick="() => this.handleClick(4)" />
+            <Square value="props.squares[5]" onSquareClick="() => this.handleClick(5)" />
+        </div>
+        <div class="board-row">
+            <Square value="props.squares[6]" onSquareClick="() => this.handleClick(6)" />
+            <Square value="props.squares[7]" onSquareClick="() => this.handleClick(7)" />
+            <Square value="props.squares[8]" onSquareClick="() => this.handleClick(8)" />
+        </div>
+    </t>
+
+    <div t-name="Game" class="game">
+        <div class="game-board">
+            <Board xIsNext="xIsNext" squares="currentSquares" onPlay.bind="handlePlay" />
+        </div>
+        <div class="game-info">
+            <ol>
+                <t t-foreach="moves" t-as="move" t-key="move.id">
+                    <li>
+                        <button t-on-click="() => this.jumpTo(move.id)">
+                            <t t-esc="move.description"/>
+                        </button>
+                    </li>
+                </t>
+            </ol>
+        </div>
+    </div>
+</templates>