chessground 1.3.1 
chessground: ^1.3.1 copied to clipboard
lichess.orgChess board UI developed for lichess.org. It has no chess logic inside so it can be used for chess variants.
example/lib/main.dart
import 'dart:math';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:chessground/chessground.dart';
import 'package:fast_immutable_collections/fast_immutable_collections.dart'
hide Tuple2;
import 'package:dartchess/dartchess.dart' as dc;
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Chessground Demo',
theme: ThemeData(
brightness: Brightness.dark,
primaryColor: Colors.blueGrey,
),
home: const HomePage(title: 'Chessground Demo'),
);
}
}
enum Mode {
botPlay,
freePlay,
}
class HomePage extends StatefulWidget {
const HomePage({Key? key, required this.title}) : super(key: key);
final String title;
@override
State<HomePage> createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
dc.Position<dc.Chess> position = dc.Chess.initial;
Side orientation = Side.white;
String fen = dc.kInitialBoardFEN;
Move? lastMove;
ValidMoves validMoves = IMap(const {});
Side sideToMove = Side.white;
PieceSet pieceSet = PieceSet.merida;
BoardTheme boardTheme = BoardTheme.blue;
bool immersiveMode = false;
Mode playMode = Mode.botPlay;
dc.Position<dc.Chess>? lastPos;
@override
Widget build(BuildContext context) {
final double screenWidth = MediaQuery.of(context).size.width;
return Scaffold(
appBar: AppBar(
title: playMode == Mode.botPlay
? const Text('Random Bot')
: const Text('Free Play'),
),
drawer: Drawer(
child: ListView(
children: [
ListTile(
title: const Text('Random Bot'),
onTap: () {
setState(() {
playMode = Mode.botPlay;
});
if (position.turn == dc.Side.black) {
_playBlackMove();
}
Navigator.pop(context);
},
),
ListTile(
title: const Text('Free Play'),
onTap: () {
setState(() {
playMode = Mode.freePlay;
});
Navigator.pop(context);
},
),
ListTile(
title: const Text('Board Thumbnails'),
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => const BoardThumbnailsPage(),
),
);
},
),
],
)),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Board(
size: screenWidth,
settings: BoardSettings(
pieceAssets: pieceSet.assets,
colorScheme: boardTheme.colors,
enableCoordinates: true,
enablePremoves: true,
),
data: BoardData(
interactableSide: playMode == Mode.botPlay
? InteractableSide.white
: (position.turn == dc.Side.white
? InteractableSide.white
: InteractableSide.black),
validMoves: validMoves,
orientation: orientation,
fen: fen,
lastMove: lastMove,
sideToMove:
position.turn == dc.Side.white ? Side.white : Side.black,
onMove: playMode == Mode.botPlay
? _onUserMoveAgainstBot
: _onUserMoveFreePlay,
isCheck: position.isCheck,
),
),
Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
ElevatedButton(
child:
Text("Immersive mode: ${immersiveMode ? 'ON' : 'OFF'}"),
onPressed: () {
setState(() {
immersiveMode = !immersiveMode;
});
if (immersiveMode) {
SystemChrome.setEnabledSystemUIMode(
SystemUiMode.immersiveSticky);
} else {
SystemChrome.setEnabledSystemUIMode(
SystemUiMode.edgeToEdge);
}
},
),
ElevatedButton(
child: Text('Orientation: ${orientation.name}'),
onPressed: () {
setState(() {
orientation = orientation.opposite;
});
},
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.max,
children: [
ElevatedButton(
child: Text('Piece set: ${pieceSet.label}'),
onPressed: () => _showChoicesPicker<PieceSet>(
context,
choices: PieceSet.values,
selectedItem: pieceSet,
labelBuilder: (t) => Text(t.label),
onSelectedItemChanged: (PieceSet? value) {
setState(() {
if (value != null) {
pieceSet = value;
}
});
},
),
),
const SizedBox(width: 8),
ElevatedButton(
child: Text('Board theme: ${boardTheme.label}'),
onPressed: () => _showChoicesPicker<BoardTheme>(
context,
choices: BoardTheme.values,
selectedItem: boardTheme,
labelBuilder: (t) => Text(t.label),
onSelectedItemChanged: (BoardTheme? value) {
setState(() {
if (value != null) {
boardTheme = value;
}
});
},
),
),
],
),
if (playMode == Mode.freePlay)
Center(
child: IconButton(
onPressed: lastPos != null
? () => setState(() {
position = lastPos!;
fen = position.fen;
validMoves =
dc.algebraicLegalMoves(position);
lastPos = null;
})
: null,
icon: const Icon(Icons.chevron_left_sharp))),
],
),
],
),
),
);
}
void _showChoicesPicker<T extends Enum>(
BuildContext context, {
required List<T> choices,
required T selectedItem,
required Widget Function(T choice) labelBuilder,
required void Function(T choice) onSelectedItemChanged,
}) {
showDialog<void>(
context: context,
builder: (context) {
return AlertDialog(
contentPadding: const EdgeInsets.only(top: 12),
scrollable: true,
content: Column(
mainAxisSize: MainAxisSize.min,
children: choices.map((value) {
return RadioListTile<T>(
title: labelBuilder(value),
value: value,
groupValue: selectedItem,
onChanged: (value) {
if (value != null) onSelectedItemChanged(value);
Navigator.of(context).pop();
},
);
}).toList(growable: false),
),
actions: [
TextButton(
child: const Text('Cancel'),
onPressed: () => Navigator.of(context).pop(),
),
],
);
},
);
}
@override
void initState() {
validMoves = dc.algebraicLegalMoves(position);
super.initState();
}
void _onUserMoveFreePlay(Move move, {bool? isDrop, bool? isPremove}) {
lastPos = position;
final m = dc.Move.fromUci(move.uci)!;
setState(() {
position = position.playUnchecked(m);
lastMove = move;
fen = position.fen;
validMoves = dc.algebraicLegalMoves(position);
});
}
void _onUserMoveAgainstBot(Move move, {bool? isDrop, bool? isPremove}) async {
lastPos = position;
final m = dc.Move.fromUci(move.uci)!;
setState(() {
position = position.playUnchecked(m);
lastMove = move;
fen = position.fen;
validMoves = IMap(const {});
});
await _playBlackMove();
}
Future<void> _playBlackMove() async {
Future.delayed(const Duration(milliseconds: 100)).then((value) {
setState(() {});
});
if (!position.isGameOver) {
final random = Random();
await Future.delayed(Duration(milliseconds: random.nextInt(5500) + 500));
final allMoves = [
for (final entry in position.legalMoves.entries)
for (final dest in entry.value.squares)
dc.NormalMove(from: entry.key, to: dest)
];
if (allMoves.isNotEmpty) {
final mv = (allMoves..shuffle()).first;
setState(() {
position = position.playUnchecked(mv);
lastMove =
Move(from: dc.toAlgebraic(mv.from), to: dc.toAlgebraic(mv.to));
fen = position.fen;
validMoves = dc.algebraicLegalMoves(position);
});
lastPos = position;
}
}
}
}
class BoardThumbnailsPage extends StatelessWidget {
const BoardThumbnailsPage({super.key});
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Board Thumbnails'),
),
body: GridView.count(
padding: const EdgeInsets.all(20),
crossAxisSpacing: 15,
mainAxisSpacing: 15,
crossAxisCount: 2,
children: [
for (final fen in positions)
LayoutBuilder(builder: (context, constraints) {
return Board(
size: constraints.biggest.width,
data: BoardData(
interactableSide: InteractableSide.none,
orientation: Side.white,
fen: fen,
),
);
}),
],
),
);
}
}
const positions = [
"rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 1 1",
"rnbqkbnr/pppp1ppp/8/4p3/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 0 2",
"rnbqkb1r/pppppppp/5n2/8/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 2 2",
"rnbqkb1r/ppp1pppp/3p4/3nP3/3P4/5N2/PPP2PPP/RNBQKB1R b KQkq - 1 4",
"rnbqkbnr/pppp1ppp/8/4p3/2B1P3/8/PPPP1PPP/RNBQK1NR b KQkq - 2 2",
"rnbqkbnr/pp1ppppp/2p5/8/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 1 2",
"rnbqkbnr/pp2pppp/2p5/3pP3/3P4/8/PPP2PPP/RNBQKBNR b KQkq - 1 3",
"rn1qkbnr/pp2pppp/2p5/5b2/3PN3/8/PPP2PPP/R1BQKBNR w KQkq - 2 5",
"rnbqkbnr/pp2pppp/2p5/3P4/3P4/8/PPP2PPP/RNBQKBNR b KQkq - 1 3",
"rnbqkb1r/pp3ppp/4pn2/3p4/2PP4/2N5/PP3PPP/R1BQKBNR w KQkq - 1 6",
"rnbqkb1r/pp3ppp/4pn2/3p4/2PP4/2N5/PP3PPP/R1BQKBNR w KQkq - 1 6",
"rnbqkbnr/pppp1ppp/8/8/3pP3/2P5/PP3PPP/RNBQKBNR b KQkq - 1 3",
"r1bqkb1r/pppp1ppp/2n2n2/4p3/4P3/2N2N2/PPPP1PPP/R1BQKB1R w KQkq - 5 4",
"r1bqkb1r/pppp1ppp/2n2n2/4p3/3PP3/2N2N2/PPP2PPP/R1BQKB1R b KQkq d3 1 4",
"r1bqkb1r/pppp1ppp/2n2n2/1B2p3/4P3/2N2N2/PPPP1PPP/R1BQK2R b KQkq - 0 4",
"rnbqkbnr/pppp1ppp/4p3/8/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 1 2",
"rnbqkbnr/ppp2ppp/4p3/3pP3/3P4/8/PPP2PPP/RNBQKBNR b KQkq - 1 3",
"rnbqkb1r/ppp2ppp/4pn2/3p2B1/3PP3/2N5/PPP2PPP/R2QKBNR b KQkq - 1 4",
"rnbqkb1r/ppp2ppp/4pn2/3p4/3PP3/2N5/PPP2PPP/R1BQKBNR w KQkq - 3 4",
"rnbqkbnr/ppp2ppp/4p3/3P4/3P4/8/PPP2PPP/RNBQKBNR b KQkq - 1 3",
"rnbqkbnr/ppp2ppp/4p3/8/3Pp3/2N5/PPP2PPP/R1BQKBNR w KQkq - 1 4",
"rnbqkbnr/ppp2ppp/4p3/3p4/3PP3/8/PPPN1PPP/R1BQKBNR b KQkq - 2 3",
"rnbqk1nr/ppp2ppp/4p3/3p4/1b1PP3/2N5/PPP2PPP/R1BQKBNR w KQkq - 3 4",
"r1bqk1nr/pppp1ppp/2n5/2b1p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 5 4",
"r1bqkbnr/pppp1ppp/2n5/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R b KQkq - 4 3",
"r1bqk1nr/pppp1ppp/2n5/2b1p3/1PB1P3/5N2/P1PP1PPP/RNBQK2R b KQkq b3 1 4",
"r1bqk1nr/ppppbppp/2n5/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 5 4",
"r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 5 4",
"rnbqkbnr/pppp1ppp/8/4p3/4PP2/8/PPPP2PP/RNBQKBNR b KQkq f3 1 2",
"rnbqkbnr/pppp1ppp/8/8/4Pp2/8/PPPP2PP/RNBQKBNR w KQkq - 1 3",
"rnbqkbnr/pppp1ppp/8/8/2B1Pp2/8/PPPP2PP/RNBQK1NR b KQkq - 2 3",
"rnbqkbnr/ppp2ppp/8/3p4/4Pp2/5N2/PPPP2PP/RNBQKB1R w KQkq d6 1 4",
"rnbqkbnr/pppp1p1p/8/6p1/4Pp2/5N2/PPPP2PP/RNBQKB1R w KQkq - 0 4",
"rnbqk1nr/pppp1ppp/8/2b1p3/4PP2/8/PPPP2PP/RNBQKBNR w KQkq - 2 3",
"rnbqkbnr/ppp2ppp/8/3pp3/4PP2/8/PPPP2PP/RNBQKBNR w KQkq d6 1 3",
"rnbqkbnr/pppppp1p/6p1/8/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 0 2",
"rnbqk1nr/ppppppbp/6p1/8/3PP3/2N5/PPP2PPP/R1BQKBNR b KQkq - 0 3",
"rnbqkbnr/ppp2ppp/3p4/4p3/4P3/5N2/PPPP1PPP/RNBQKB1R w KQkq - 1 3",
"rnbqkb1r/ppp1pppp/3p1n2/8/3PP3/8/PPP2PPP/RNBQKBNR w KQkq - 2 3",
"rnbqkb1r/ppp1pp1p/3p1np1/8/3PPP2/2N5/PPP3PP/R1BQKBNR b KQkq f3 1 4",
"rnbqkb1r/ppp1pp1p/3p1np1/8/3PP3/2N2N2/PPP2PPP/R1BQKB1R b KQkq - 2 4",
"rnbqkb1r/pppp1ppp/5n2/4p3/4P3/5N2/PPPP1PPP/RNBQKB1R w KQkq - 3 3",
"rnbqkb1r/ppp2ppp/3p4/8/3Pn3/5N2/PPP2PPP/RNBQKB1R b KQkq d3 1 5",
"rnbqkb1r/pppp1ppp/5n2/4p3/3PP3/5N2/PPP2PPP/RNBQKB1R b KQkq d3 1 3",
"rnbqkb1r/pppp1ppp/5n2/4p3/4P3/2N2N2/PPPP1PPP/R1BQKB1R b KQkq - 4 3",
"r1bqkbnr/pppp1ppp/2n5/1B2p3/4P3/5N2/PPPP1PPP/RNBQK2R b KQkq - 4 3",
"r1bqkb1r/pppp1ppp/2n2n2/1B2p3/4P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 5 4",
"r1bqk1nr/pppp1ppp/2n5/1Bb1p3/4P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 5 4",
"r1bqk2r/2ppbppp/p1n2n2/1p2p3/4P3/1B3N2/PPPP1PPP/RNBQR1K1 b kq - 0 7",
"r1bqkbnr/1ppp1ppp/p1B5/4p3/4P3/5N2/PPPP1PPP/RNBQK2R b KQkq - 1 4",
"r1bq1rk1/2p1bppp/p1n2n2/1p1pp3/4P3/1BP2N2/PP1P1PPP/RNBQR1K1 w - - 0 9",
"r1bqkbnr/pppp2pp/2n5/1B2pp2/4P3/5N2/PPPP1PPP/RNBQK2R w KQkq f6 1 4",
"rnbqkbnr/ppp1pppp/8/3p4/4P3/8/PPPP1PPP/RNBQKBNR w KQkq d6 1 2",
"rnbqkb1r/ppp1pppp/5n2/3P4/3P4/8/PPP2PPP/RNBQKBNR b KQkq - 0 3",
"r1bqkbnr/pppp1ppp/2n5/4p3/3PP3/5N2/PPP2PPP/RNBQKB1R b KQkq d3 1 3",
"r1bqk1nr/pppp1ppp/2n5/2b5/3NP3/8/PPP2PPP/RNBQKB1R w KQkq - 2 5",
"r1bqkb1r/p1pp1ppp/2p2n2/4P3/8/8/PPP2PPP/RNBQKB1R b KQkq - 1 6",
"r1b1kbnr/pppp1ppp/2n5/8/3NP2q/8/PPP2PPP/RNBQKB1R w KQkq - 2 5",
"rnbqkbnr/pp1ppppp/8/2p5/4P3/8/PPPP1PPP/RNBQKBNR w KQkq c6 1 2",
"r1bqkbnr/pp1ppp1p/2n3p1/8/3NP3/8/PPP2PPP/RNBQKB1R w KQkq - 1 5",
"rnbqkbnr/pp1ppppp/8/2p5/4P3/2P5/PP1P1PPP/RNBQKBNR b KQkq - 1 2",
"rnbqkbnr/pp1ppppp/8/2p5/4P3/2N5/PPPP1PPP/R1BQKBNR b KQkq - 2 2",
"rnbqkb1r/pp2pp1p/3p1np1/8/3NP3/2N5/PPP2PPP/R1BQKB1R w KQkq - 1 6",
"r1bqkbnr/pp1ppppp/2n5/2p5/4PP2/2N5/PPPP2PP/R1BQKBNR b KQkq f3 1 3",
"rnbqkbnr/pp1ppp1p/6p1/2p5/4P3/5N2/PPPP1PPP/RNBQKB1R w KQkq - 1 2",
"rnbqkbnr/1p1p1ppp/p3p3/8/3NP3/8/PPP2PPP/RNBQKB1R w KQkq - 1 5",
"rnbqkb1r/1p2pppp/p2p1n2/8/3NP3/2N5/PPP2PPP/R1BQKB1R w KQkq - 1 6",
"r1bqkb1r/pp2pppp/2np1n2/6B1/3NP3/2N5/PPP2PPP/R2QKB1R b KQkq - 5 6",
"rnbqkb1r/pp3ppp/3ppn2/8/3NP3/2N5/PPP2PPP/R1BQKB1R w KQkq - 1 6",
"rnbqkbnr/pp1ppppp/8/8/3pP3/2P5/PP3PPP/RNBQKBNR b KQkq - 1 3",
"rnbqkbnr/pppp1ppp/8/4p3/4P3/2N5/PPPP1PPP/R1BQKBNR b KQkq - 2 2",
"rnbqkb1r/pppp1ppp/8/4p3/2B1n3/2N5/PPPP1PPP/R1BQK1NR w KQkq - 0 4",
"r1bqkb1r/pppp1ppp/2n2n2/4N3/4P3/2N5/PPPP1PPP/R1BQKB1R b KQkq - 1 4",
"rnbqkbnr/pppp1ppp/8/4p3/4P3/8/PPPPKPPP/RNBQ1BNR b kq - 0 2",
"rnbqkbnr/pppppppp/8/8/3P4/8/PPP1PPPP/RNBQKBNR b KQkq d3 1 1",
"rnbqkb1r/p2ppppp/5n2/1ppP4/2P5/8/PP2PPPP/RNBQKBNR w KQkq b6 1 4",
"rnbqkb1r/pp1p1ppp/4pn2/2pP4/2P5/8/PP2PPPP/RNBQKBNR w KQkq - 0 4",
"rnbqkb1r/pp1p1ppp/5n2/2pPp3/2P5/8/PP2PPPP/RNBQKBNR w KQkq - 0 4",
"rnbqkbnr/ppp1pppp/8/3p4/3PP3/8/PPP2PPP/RNBQKBNR b KQkq e3 1 2",
"rnbqk2r/pppp1ppp/4pn2/8/1bPP4/5N2/PP2PPPP/RNBQKB1R w KQkq - 3 4",
"rnbqkb1r/pppp1ppp/4pn2/8/2PP4/6P1/PP2PP1P/RNBQKBNR b KQkq - 1 3",
"rnbqk2r/ppp1bppp/4pn2/3p4/2PP4/5NP1/PP2PPBP/RNBQK2R b KQkq - 4 5",
"rnbqkbnr/ppppp1pp/8/5p2/3P4/8/PPP1PPPP/RNBQKBNR w KQkq f6 1 2",
"rnbqk2r/ppppp1bp/5np1/5p2/2PP4/5NP1/PP2PPBP/RNBQK2R b KQkq - 4 5",
"rnbqkb1r/ppppp1pp/5n2/6B1/3Pp3/2N5/PPP2PPP/R2QKBNR b KQkq - 4 4",
"rnbq1rk1/ppp1b1pp/4pn2/3p1p2/2PP4/5NP1/PP2PPBP/RNBQ1RK1 w - d6 1 7",
"rnbqkb1r/ppp1pp1p/5np1/3p4/2PP4/2N5/PP2PPPP/R1BQKBNR w KQkq d6 1 4",
"rnbqkb1r/ppp1pp1p/5np1/3p4/2PP1B2/2N5/PP2PPPP/R2QKBNR b KQkq - 2 4",
"rnbqkb1r/ppp1pp1p/6p1/3n4/3P4/2N5/PP2PPPP/R1BQKBNR w KQkq - 1 5",
"rnbqkb1r/ppp1pp1p/5np1/3p4/2PP4/1QN5/PP2PPPP/R1B1KBNR b KQkq - 0 4",
"rnbqk2r/ppp1ppbp/5np1/3p2B1/2PP4/2N2N2/PP2PPPP/R2QKB1R b KQkq - 0 5",
"rnbqkb1r/pppppp1p/5np1/8/2PP4/8/PP2PPPP/RNBQKBNR w KQkq - 1 3",
"rnbqk2r/ppp1ppbp/3p1np1/8/2PPP3/2N5/PP3PPP/R1BQKBNR w KQkq - 1 5",
"rnbq1rk1/ppp1ppbp/3p1np1/6B1/2PPP3/2N5/PP2BPPP/R2QK1NR b KQ - 4 6",
"rnbqk2r/ppp1ppbp/3p1np1/8/2PP4/2N2NP1/PP2PP1P/R1BQKB1R b KQkq - 1 5",
"rnbqk2r/ppp1ppbp/3p1np1/8/2PPPP2/2N5/PP4PP/R1BQKBNR b KQkq f3 1 5",
"rnbq1rk1/ppp1ppbp/3p1np1/8/2PPP3/2N2N2/PP2BPPP/R1BQK2R b KQ - 4 6",
"rnbqk2r/ppp1ppbp/3p1np1/8/2PPP3/2N2P2/PP4PP/R1BQKBNR b KQkq - 1 5",
"rnbqk1nr/ppp1ppbp/3p2p1/8/2PP4/2N5/PP2PPPP/R1BQKBNR w KQkq - 1 4",
"rnbqk2r/pppp1ppp/4pn2/8/1bPP4/2N5/PP2PPPP/R1BQKBNR w KQkq - 3 4",
"rnbqk2r/pppp1ppp/4pn2/8/1bPP4/2N5/PPQ1PPPP/R1B1KBNR b KQkq - 4 4",
"rnbqk2r/p1pp1ppp/1p2pn2/8/1bPP4/2N1P3/PP3PPP/R1BQKBNR w KQkq - 0 5",
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];Metadata
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Metadata
Chess board UI developed for lichess.org. It has no chess logic inside so it can be used for chess variants.
Repository (GitHub)
View/report issues
Funding
Consider supporting this project:
lichess.org
License
unknown (license)
Dependencies
android_gesture_exclusion, fast_immutable_collections, flutter
