jusax23/flutter_stockfish_plugin
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237
example/example.md
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@ -1,237 +0,0 @@
Example reused from [stockfish_chess_engine](https://github.com/loloof64/StockfishChessEngineFlutter).
```dart
import 'dart:async';
import 'package:clipboard/clipboard.dart';
import 'package:flutter/material.dart';
import 'package:material_design_icons_flutter/material_design_icons_flutter.dart';
import 'package:chess/chess.dart' as chess_lib;
import 'package:window_manager/window_manager.dart';
import 'package:flutter_stockfish_plugin/stockfish.dart';
import 'package:flutter_stockfish_plugin/stockfish_state.dart';
void main() {
runApp(const MaterialApp(
home: MyApp(),
));
}
class MyApp extends StatefulWidget {
const MyApp({Key? key}) : super(key: key);
@override
MyAppState createState() => MyAppState();
}
class MyAppState extends State<MyApp> with WindowListener {
late Stockfish _stockfish;
final _fenController = TextEditingController(
text: 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1');
late StreamSubscription _stockfishOutputSubsciption;
var _timeMs = 1000.0;
var _nextMove = '';
var _stockfishOutputText = '';
@override
void initState() {
windowManager.addListener(this);
_overrideDefaultCloseHandler();
_doStartStockfish();
super.initState();
}
Future<void> _overrideDefaultCloseHandler() async {
await windowManager.setPreventClose(true);
setState(() {});
}
@override
void dispose() {
_stopStockfish();
super.dispose();
}
@override
void onWindowClose() async {
_stopStockfish();
await Future.delayed(const Duration(milliseconds: 200));
await windowManager.destroy();
}
void _readStockfishOutput(String output) {
// At least now, stockfish is ready : update UI.
setState(() {
_stockfishOutputText += "$output\n";
});
if (output.startsWith('bestmove')) {
final parts = output.split(' ');
setState(() {
_nextMove = parts[1];
});
}
}
void _pasteFen() {
FlutterClipboard.paste().then((value) {
setState(() {
_fenController.text = value;
});
});
}
void _updateThinkingTime(double newValue) {
setState(() {
_timeMs = newValue;
});
}
bool _validPosition() {
final chess = chess_lib.Chess();
return chess.load(_fenController.text.trim());
}
void _computeNextMove() {
if (!_validPosition()) {
final message = "Illegal position: '${_fenController.text.trim()}' !\n";
setState(() {
_stockfishOutputText = message;
});
return;
}
setState(() {
_stockfishOutputText = '';
});
_stockfish.stdin = 'position fen ${_fenController.text.trim()}';
_stockfish.stdin = 'go movetime ${_timeMs.toInt()}';
}
void _stopStockfish() async {
if (_stockfish.state.value == StockfishState.disposed ||
_stockfish.state.value == StockfishState.error) {
return;
}
_stockfishOutputSubsciption.cancel();
_stockfish.stdin = 'quit';
await Future.delayed(const Duration(milliseconds: 200));
setState(() {});
}
void _doStartStockfish() async {
_stockfish = Stockfish();
_stockfishOutputSubsciption =
_stockfish.stdout.listen(_readStockfishOutput);
setState(() {
_stockfishOutputText = '';
});
await Future.delayed(const Duration(milliseconds: 1100));
_stockfish.stdin = 'uci';
await Future.delayed(const Duration(milliseconds: 3000));
_stockfish.stdin = 'isready';
}
void _startStockfishIfNecessary() {
setState(() {
if (_stockfish.state.value == StockfishState.ready ||
_stockfish.state.value == StockfishState.starting) {
return;
}
_doStartStockfish();
});
}
Icon _getStockfishStatusIcon() {
Color color;
switch (_stockfish.state.value) {
case StockfishState.ready:
color = Colors.green;
break;
case StockfishState.disposed:
case StockfishState.error:
color = Colors.red;
break;
case StockfishState.starting:
color = Colors.orange;
}
return Icon(MdiIcons.circle, color: color);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text("Stockfish Chess Engine example"),
),
body: SingleChildScrollView(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
TextField(
controller: _fenController,
decoration: const InputDecoration(
hintText: 'Position FEN value',
border: OutlineInputBorder(),
),
),
ElevatedButton(
onPressed: _pasteFen,
child: const Text('Coller FEN'),
),
Slider(
value: _timeMs,
onChanged: _updateThinkingTime,
min: 500,
max: 3000,
),
Text('Thinking time : ${_timeMs.toInt()} millis'),
ElevatedButton(
onPressed: _computeNextMove,
child: const Text('Search next move'),
),
Text('Best move: $_nextMove'),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
_getStockfishStatusIcon(),
ElevatedButton(
onPressed: _startStockfishIfNecessary,
child: const Text('Start Stockfish'),
),
ElevatedButton(
onPressed: _stopStockfish,
child: const Text('Stop Stockfish'),
),
],
),
Padding(
padding: const EdgeInsets.all(8.0),
child: Container(
width: 850.0,
height: 300.0,
decoration: BoxDecoration(
border: Border.all(
width: 2.0,
),
borderRadius: const BorderRadius.all(
Radius.circular(8.0),
),
),
child: SingleChildScrollView(
child: Text(
_stockfishOutputText,
),
),
),
),
],
),
),
),
);
}
}
```

2
lib/stockfish.dart
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@ -14,7 +14,7 @@ import 'stockfish_bindings_generated.dart';
import 'stockfish_state.dart'; import 'stockfish_state.dart';
const String _libName = 'flutter_stockfish_plugin'; const String _libName = 'flutter_stockfish_plugin';
//const String _releaseType = kDebugMode ? 'Debug' : 'Release'; const String _releaseType = kDebugMode ? 'Debug' : 'Release';
/// The dynamic library in which the symbols for [StockfishChessEngineBindings] can be found. /// The dynamic library in which the symbols for [StockfishChessEngineBindings] can be found.
final DynamicLibrary _dylib = () { final DynamicLibrary _dylib = () {

4
pubspec.yaml
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@ -1,7 +1,7 @@
name: flutter_stockfish_plugin name: flutter_stockfish_plugin
description: "A Stockfish Plugin for Flutter. Use Stockfish 16 directly in your flutter app." description: "A Stockfish Plugin for Flutter."
version: 1.0.0 version: 1.0.0
homepage: https://github.com/jusax23/flutter_stockfish_plugin repository: https://github.com/jusax23/flutter_stockfish_plugin
environment: environment:
sdk: '>=2.17.1 <4.0.0' sdk: '>=2.17.1 <4.0.0'