example.md
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example/example.md
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example/example.md
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Example reused from [stockfish_chess_engine](https://github.com/loloof64/StockfishChessEngineFlutter).
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```dart
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import 'dart:async';
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import 'package:clipboard/clipboard.dart';
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import 'package:flutter/material.dart';
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import 'package:material_design_icons_flutter/material_design_icons_flutter.dart';
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import 'package:chess/chess.dart' as chess_lib;
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import 'package:window_manager/window_manager.dart';
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import 'package:flutter_stockfish_plugin/stockfish.dart';
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import 'package:flutter_stockfish_plugin/stockfish_state.dart';
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void main() {
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runApp(const MaterialApp(
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home: MyApp(),
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));
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}
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class MyApp extends StatefulWidget {
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const MyApp({Key? key}) : super(key: key);
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@override
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MyAppState createState() => MyAppState();
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}
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class MyAppState extends State<MyApp> with WindowListener {
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late Stockfish _stockfish;
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final _fenController = TextEditingController(
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text: 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1');
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late StreamSubscription _stockfishOutputSubsciption;
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var _timeMs = 1000.0;
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var _nextMove = '';
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var _stockfishOutputText = '';
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@override
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void initState() {
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windowManager.addListener(this);
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_overrideDefaultCloseHandler();
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_doStartStockfish();
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super.initState();
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}
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Future<void> _overrideDefaultCloseHandler() async {
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await windowManager.setPreventClose(true);
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setState(() {});
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}
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@override
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void dispose() {
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_stopStockfish();
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super.dispose();
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}
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@override
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void onWindowClose() async {
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_stopStockfish();
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await Future.delayed(const Duration(milliseconds: 200));
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await windowManager.destroy();
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}
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void _readStockfishOutput(String output) {
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// At least now, stockfish is ready : update UI.
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setState(() {
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_stockfishOutputText += "$output\n";
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});
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if (output.startsWith('bestmove')) {
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final parts = output.split(' ');
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setState(() {
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_nextMove = parts[1];
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});
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}
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}
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void _pasteFen() {
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FlutterClipboard.paste().then((value) {
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setState(() {
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_fenController.text = value;
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});
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});
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}
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void _updateThinkingTime(double newValue) {
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setState(() {
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_timeMs = newValue;
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});
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}
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bool _validPosition() {
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final chess = chess_lib.Chess();
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return chess.load(_fenController.text.trim());
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}
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void _computeNextMove() {
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if (!_validPosition()) {
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final message = "Illegal position: '${_fenController.text.trim()}' !\n";
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setState(() {
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_stockfishOutputText = message;
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});
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return;
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}
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setState(() {
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_stockfishOutputText = '';
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});
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_stockfish.stdin = 'position fen ${_fenController.text.trim()}';
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_stockfish.stdin = 'go movetime ${_timeMs.toInt()}';
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}
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void _stopStockfish() async {
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if (_stockfish.state.value == StockfishState.disposed ||
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_stockfish.state.value == StockfishState.error) {
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return;
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}
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_stockfishOutputSubsciption.cancel();
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_stockfish.stdin = 'quit';
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await Future.delayed(const Duration(milliseconds: 200));
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setState(() {});
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}
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void _doStartStockfish() async {
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_stockfish = Stockfish();
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_stockfishOutputSubsciption =
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_stockfish.stdout.listen(_readStockfishOutput);
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setState(() {
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_stockfishOutputText = '';
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});
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await Future.delayed(const Duration(milliseconds: 1100));
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_stockfish.stdin = 'uci';
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await Future.delayed(const Duration(milliseconds: 3000));
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_stockfish.stdin = 'isready';
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}
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void _startStockfishIfNecessary() {
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setState(() {
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if (_stockfish.state.value == StockfishState.ready ||
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_stockfish.state.value == StockfishState.starting) {
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return;
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}
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_doStartStockfish();
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});
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}
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Icon _getStockfishStatusIcon() {
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Color color;
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switch (_stockfish.state.value) {
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case StockfishState.ready:
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color = Colors.green;
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break;
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case StockfishState.disposed:
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case StockfishState.error:
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color = Colors.red;
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break;
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case StockfishState.starting:
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color = Colors.orange;
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}
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return Icon(MdiIcons.circle, color: color);
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(
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title: const Text("Stockfish Chess Engine example"),
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),
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body: SingleChildScrollView(
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child: Padding(
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padding: const EdgeInsets.all(8.0),
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child: Column(
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mainAxisAlignment: MainAxisAlignment.spaceEvenly,
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crossAxisAlignment: CrossAxisAlignment.center,
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children: [
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TextField(
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controller: _fenController,
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decoration: const InputDecoration(
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hintText: 'Position FEN value',
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border: OutlineInputBorder(),
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),
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),
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ElevatedButton(
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onPressed: _pasteFen,
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child: const Text('Coller FEN'),
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),
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Slider(
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value: _timeMs,
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onChanged: _updateThinkingTime,
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min: 500,
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max: 3000,
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),
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Text('Thinking time : ${_timeMs.toInt()} millis'),
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ElevatedButton(
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onPressed: _computeNextMove,
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child: const Text('Search next move'),
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),
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Text('Best move: $_nextMove'),
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Row(
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mainAxisAlignment: MainAxisAlignment.spaceEvenly,
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children: [
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_getStockfishStatusIcon(),
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ElevatedButton(
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onPressed: _startStockfishIfNecessary,
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child: const Text('Start Stockfish'),
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),
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ElevatedButton(
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onPressed: _stopStockfish,
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child: const Text('Stop Stockfish'),
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),
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],
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),
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Padding(
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padding: const EdgeInsets.all(8.0),
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child: Container(
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width: 850.0,
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height: 300.0,
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decoration: BoxDecoration(
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border: Border.all(
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width: 2.0,
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),
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borderRadius: const BorderRadius.all(
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Radius.circular(8.0),
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),
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),
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child: SingleChildScrollView(
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child: Text(
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_stockfishOutputText,
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),
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),
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),
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),
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],
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),
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),
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),
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);
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}
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}
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```
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