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142 lines
3.2 KiB
JavaScript
142 lines
3.2 KiB
JavaScript
import React from 'react';
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import Helmet from 'react-helmet';
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import style from './tictactoe.css';
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function Square(props) {
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return (
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<button className={style.square} onClick={props.onClick}>
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{props.value}
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</button>
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);
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}
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function calculateWinner(squares) {
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const lines = [
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[0, 1, 2],
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[3, 4, 5],
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[6, 7, 8],
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[0, 3, 6],
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[1, 4, 7],
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[2, 5, 8],
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[0, 4, 8],
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[2, 4, 6]
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];
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for (let i = 0; i < lines.length; i++) {
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const [a, b, c] = lines[i];
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if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
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return squares[a];
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}
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}
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return null;
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}
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class Board extends React.Component {
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renderSquare(i) {
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return (
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<Square
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value={this.props.squares[i]}
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onClick={() => this.props.onClick(i)}
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/>
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);
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}
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render() {
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return (
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<div>
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<div className={style.boardRow}>
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{this.renderSquare(0)}
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{this.renderSquare(1)}
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{this.renderSquare(2)}
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</div>
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<div className={style.boardRow}>
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{this.renderSquare(3)}
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{this.renderSquare(4)}
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{this.renderSquare(5)}
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</div>
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<div className={style.boardRow}>
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{this.renderSquare(6)}
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{this.renderSquare(7)}
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{this.renderSquare(8)}
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</div>
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</div>
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);
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}
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}
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class Game extends React.Component {
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constructor(props) {
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super(props);
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this.state = {
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history: [
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{
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squares: Array(9).fill(null)
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}
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],
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stepNumber: 0,
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xIsNext: true
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};
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}
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handleClick(i) {
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const history = this.state.history.slice(0, this.state.stepNumber + 1);
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const current = history[history.length - 1];
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const squares = current.squares.slice();
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if (calculateWinner(squares) || squares[i]) {
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return;
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}
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squares[i] = this.state.xIsNext ? 'X' : 'O';
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this.setState({
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history: history.concat([
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{
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squares: squares
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}
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]),
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stepNumber: history.length,
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xIsNext: !this.state.xIsNext
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});
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}
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jumpTo(step) {
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this.setState({
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stepNumber: step,
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xIsNext: step % 2 === 0
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});
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}
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render() {
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const history = this.state.history;
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const current = history[this.state.stepNumber];
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const winner = calculateWinner(current.squares);
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const moves = history.map((step, move) => {
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const desc = move ? 'Go to move #' + move : 'Go to game start';
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return (
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<li key={move}>
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<button onClick={() => this.jumpTo(move)}>{desc}</button>
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</li>
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);
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});
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let status;
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if (winner) {
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status = 'Winner: ' + winner;
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} else {
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status = 'Next player: ' + (this.state.xIsNext ? 'X' : 'O');
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}
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return (
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<div className={style.game}>
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<Helmet title="Tic Tac Toe" />
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<div className={style.gameBoard}>
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<Board squares={current.squares} onClick={i => this.handleClick(i)} />
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</div>
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<div className={style.gameInfo}>
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<div>{status}</div>
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<ol>{moves}</ol>
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</div>
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</div>
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);
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}
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}
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export default Game;
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