Chessboard-TSX

Chessboard-TSX is an npm package that provides a chessboard component for rendering the board and pieces in a React Native application. It is designed to be used in conjunction with chess.js, a library that handles the logic of the chess pieces.

Installation

You can install Chessboard-TSX using npm:

npm install chessboard-tsx

Usage

First, import the Chessboard component from the package:

import { Board } from "chessboard-tsx";

Then, you can use the Chessboard component in your React application:

<Board
  state={state} // the state of the chess game, using chess.js
  selectedPiece={selectedPiece} // the currently selected piece
  setSelectedPiece={setSelected} // a function to set the selected piece
  onMove={onMove} // a function to handle a move
  legalMoves={legalMoves} // the legal moves for the selected piece
/>

Integration with chess.js Chessboard-TSX is designed to be used with chess.js. You can use chess.js to handle the logic of the chess game, and then use Chessboard-TSX to render the board and pieces.

Here is an example of how to integrate Chessboard-TSX with chess.js:

import { Text, View } from "react-native";
import { Chess, Square } from "chess.js";
import { useCallback, useState } from "react";
import { Board } from "chessboard-tsx";
import { useRef } from "react";

function useConst<T>(initialValue: T | (() => T)): T {
  const ref = useRef<{ value: T }>();
  if (ref.current === undefined) {
    // Box the value in an object so we can tell if it's initialized even if the initializer
    // returns/is undefined
    ref.current = {
      value:
        typeof initialValue === "function"
          ? // eslint-disable-next-line @typescript-eslint/ban-types
            (initialValue as Function)()
          : initialValue,
    };
  }
  return ref.current.value;
}

export const ChessBoard = () => {
  const chess = useConst(() => new Chess());
  const [state, setState] = useState({
    player: "w",
    board: chess.board(),
  });
  const [selectedPiece, setSelectedPiece] = useState<string>();
  const [legalMoves, setLegalMoves] = useState<Square[]>([]);

  const setSelected = (piece?: string | any) => {
    if (typeof piece === "function") {
      const selected = piece(selectedPiece);
      setSelectedPiece(selected);
      if (selected === undefined) {
        setLegalMoves([]);
        return;
      }
      const moves = chess.moves({
        square: selected.slice(2) as any,
        verbose: true,
      });
      setLegalMoves(moves.map((move) => move.to));
      return;
    }
    if (piece === undefined) {
      setLegalMoves([]);
      setSelectedPiece(undefined);
      return;
    }
    const moves = chess.moves({
      square: piece.slice(2) as any,
      verbose: true,
    });
    setLegalMoves(moves.map((move) => move.to));
    setSelectedPiece(piece);
  };

  const onTurn = useCallback(() => {
    setState({
      player: state.player === "w" ? "b" : "w",
      board: chess.board(),
    });
    setSelectedPiece(undefined);
    setLegalMoves([]);
  }, [chess, state.player]);

  const onMove = useCallback(
    (square: Square, selectedPiece: string) => {
      const legalMove = legalMoves.includes(square);
      if (legalMove) {
        chess.move({
          from: selectedPiece?.slice(2) as any,
          to: square as any,
        });
        onTurn();
      } else {
        setSelectedPiece(undefined);
      }
    },
    [chess, legalMoves, onTurn]
  );

  return (
    <View
      style={{
        flex: 1,
        alignItems: "center",
        justifyContent: "center",
      }}
    >
      <Text
        style={{
          fontSize: 24,
          fontWeight: "bold",
          marginBottom: 24,
        }}
      >
        ChessBoard.tsx
      </Text>
      <Board
        state={state}
        selectedPiece={selectedPiece}
        setSelectedPiece={setSelected}
        onMove={onMove}
        legalMoves={legalMoves}
      />
    </View>
  );
};

Contributing

This is largely a personal project, but if you have any suggestions or improvements, feel free to open an issue or pull request. Or just fork the project and make your own version!

License

This project is licensed under the MIT License - see the LICENSE.md file for details. ```