v2: prepare to move

v2/website/components/Tictactoe/board.js

@@ -0,0 +1,36 @@
+import React from 'react';
+import Square from './square';
+import styles from './styles.css';
+
+export default class Board extends React.Component {
+  renderSquare(i) {
+    return (
+      <Square
+        value={this.props.squares[i]}
+        onClick={() => this.props.onClick(i)}
+      />
+    );
+  }
+
+  render() {
+    return (
+      <div>
+        <div className={styles.boardRow}>
+          {this.renderSquare(0)}
+          {this.renderSquare(1)}
+          {this.renderSquare(2)}
+        </div>
+        <div className={styles.boardRow}>
+          {this.renderSquare(3)}
+          {this.renderSquare(4)}
+          {this.renderSquare(5)}
+        </div>
+        <div className={styles.boardRow}>
+          {this.renderSquare(6)}
+          {this.renderSquare(7)}
+          {this.renderSquare(8)}
+        </div>
+      </div>
+    );
+  }
+}

v2/website/components/Tictactoe/index.js

@@ -0,0 +1,106 @@
+import React from 'react';
+import Helmet from 'react-helmet';
+import Layout from '@theme/Layout';
+import Board from './board';
+import styles from './styles.css';
+
+class Game extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      history: [
+        {
+          squares: Array(9).fill(null)
+        }
+      ],
+      stepNumber: 0,
+      xIsNext: true
+    };
+  }
+
+  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;
+  }
+
+  handleClick(i) {
+    const history = this.state.history.slice(0, this.state.stepNumber + 1);
+    const current = history[history.length - 1];
+    const squares = current.squares.slice();
+    if (this.calculateWinner(squares) || squares[i]) {
+      return;
+    }
+    squares[i] = this.state.xIsNext ? 'X' : 'O';
+    this.setState({
+      history: history.concat([
+        {
+          squares: squares
+        }
+      ]),
+      stepNumber: history.length,
+      xIsNext: !this.state.xIsNext
+    });
+  }
+
+  jumpTo(step) {
+    this.setState({
+      stepNumber: step,
+      xIsNext: step % 2 === 0
+    });
+  }
+
+  render() {
+    const history = this.state.history;
+    const current = history[this.state.stepNumber];
+    const winner = this.calculateWinner(current.squares);
+
+    const moves = history.map((step, move) => {
+      const desc = move ? 'Go to move #' + move : 'Go to game start';
+      return (
+        <li key={move}>
+          <button onClick={() => this.jumpTo(move)}>{desc}</button>
+        </li>
+      );
+    });
+
+    let status;
+    if (winner) {
+      status = 'Winner: ' + winner;
+    } else {
+      status = 'Next player: ' + (this.state.xIsNext ? 'X' : 'O');
+    }
+
+    return (
+      <div className={styles.game}>
+        <div className={styles.gameBoard}>
+          <Board squares={current.squares} onClick={i => this.handleClick(i)} />
+        </div>
+        <div className={styles.gameInfo}>
+          <div>{status}</div>
+          <ol>{moves}</ol>
+        </div>
+      </div>
+    );
+  }
+}
+
+export default Game;

v2/website/components/Tictactoe/square.js

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+import React from 'react';
+import styles from './styles.css';
+
+export default props => {
+  return (
+    <button className={styles.square} onClick={props.onClick}>
+      {props.value}
+    </button>
+  );
+};

v2/website/components/Tictactoe/styles.css

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+.boardRow:after {
+  clear: both;
+  content: "";
+  display: table;
+}
+
+.status {
+  margin-bottom: 10px;
+}
+
+.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;
+}
+
+.square:focus {
+  outline: none;
+}
+
+.game {
+  display: flex;
+  flex-direction: row;
+  margin-left: auto;
+  margin-right: auto;
+  justify-content: center;
+}
+
+.gameInfo {
+  margin-left: 20px;
+}
+
+.gameBoard {
+  margin-left: 10px;
+}