76 lines
1.9 KiB
Dart
76 lines
1.9 KiB
Dart
// ignore_for_file: avoid_web_libraries_in_flutter
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import 'dart:async';
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import 'dart:js' as js;
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import 'dart:html' as html;
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import 'package:flutter/foundation.dart';
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import 'package:flutter_stockfish_plugin/stockfish_bindings.dart';
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const jsPath = "stockfish/";
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class StockfishChessEngineBindings
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extends StockfishChessEngineAbstractBindings {
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Future<void>? loadJs;
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StockfishChessEngineBindings() {
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loadJs = loadJsFileIfNeeded();
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}
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@override
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void cleanUp(int exitCode) {
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stdoutController.close();
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js.context.callMethod("stop_listening", []);
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}
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@override
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Future<int> stockfishMain(Function active) async {
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if (loadJs != null) {
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await loadJs;
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loadJs = null;
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}
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final completer = Completer<int>();
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js.context.callMethod("start_listening", [
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(line) => stdoutController.sink.add(line),
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(state) {
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cleanUp(state is int ? state : 1);
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completer.complete(state is int ? state : 1);
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}
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]);
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active();
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return completer.future;
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}
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@override
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void write(String line) {
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js.context.callMethod("write", [line]);
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}
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}
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bool _jsloaded = false;
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Future<void> loadJsFileIfNeeded() async {
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if (kIsWeb && !_jsloaded) {
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final stockfishScript = html.document.createElement("script");
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stockfishScript.setAttribute("src", "${jsPath}flutter_stockfish_plugin.js");
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html.document.head?.append(stockfishScript);
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await stockfishScript.onLoad.first;
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final jsBindingsScript = html.document.createElement("script");
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jsBindingsScript.setAttribute("src", "${jsPath}js_bindings.js");
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html.document.head?.append(jsBindingsScript);
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await jsBindingsScript.onLoad.first;
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_jsloaded = true;
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}
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await _stockfishWaitReady();
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}
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Future<dynamic> _stockfishWaitReady() {
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final completer = Completer<dynamic>();
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js.context.callMethod('wait_ready', [
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completer.complete,
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]);
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return completer.future;
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}
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