Changes you see? To many to name them. And a splash screen for flutter web of course.

lib/api/websocket_message.dart

@@ -2,6 +2,7 @@ import 'package:mchess/api/move.dart';
 
 enum MessageType {
   move,
+  invalidMove,
   colorDetermined;
 
   String toJson() => name;
@@ -20,9 +21,13 @@ class ApiWebsocketMessage {
   final MessageType type;
   final ApiMove? move;
   final ApiColor? color;
+  final String? reason;
 
   ApiWebsocketMessage(
-      {required this.type, required this.move, required this.color});
+      {required this.type,
+      required this.move,
+      required this.color,
+      required this.reason});
 
   factory ApiWebsocketMessage.fromJson(Map<String, dynamic> json) {
     final type = MessageType.fromJson(json['messageType']);
@@ -30,11 +35,25 @@ class ApiWebsocketMessage {
     switch (type) {
       case MessageType.colorDetermined:
         ret = ApiWebsocketMessage(
-            type: type, move: null, color: ApiColor.fromJson(json['color']));
+            type: type,
+            move: null,
+            color: ApiColor.fromJson(json['color']),
+            reason: null);
         break;
       case MessageType.move:
         ret = ApiWebsocketMessage(
-            type: type, move: ApiMove.fromJson(json['move']), color: null);
+            type: type,
+            move: ApiMove.fromJson(json['move']),
+            color: null,
+            reason: null);
+        break;
+      case MessageType.invalidMove:
+        ret = ApiWebsocketMessage(
+          type: type,
+          move: ApiMove.fromJson(json['move']),
+          color: null,
+          reason: json['reason'],
+        );
     }
     return ret;
   }

lib/chess/chess_app.dart

@@ -18,7 +18,7 @@ class ChessApp extends StatelessWidget {
             useMaterial3: true,
           ),
           routerConfig: ChessAppRouter.getInstance().router,
-          title: 'mChess v0.1.1337',
+          title: 'mChess',
         ),
       ),
     );

lib/chess_bloc/chess_bloc.dart

@@ -21,8 +21,9 @@ class ChessBloc extends Bloc<ChessEvent, ChessBoardState> {
   ChessBloc._internal() : super(ChessBoardState.init()) {
     on<InitBoard>(initBoard);
     on<ColorDetermined>(flipBoard);
-    on<OpponentPieceMoved>(opponentMoveHandler);
+    on<ReceivedMove>(moveHandler);
     on<OwnPieceMoved>(ownMoveHandler);
+    on<InvalidMovePlayed>(invalidMoveHandler);
   }
 
   factory ChessBloc.getInstance() {
@@ -45,8 +46,7 @@ class ChessBloc extends Bloc<ChessEvent, ChessBoardState> {
     emit(ChessBoardState(event.myColor, state.newTurnColor, state.position));
   }
 
-  void opponentMoveHandler(
-      OpponentPieceMoved event, Emitter<ChessBoardState> emit) {
+  void moveHandler(ReceivedMove event, Emitter<ChessBoardState> emit) {
     log('opponentMoveHandler()');
     ChessPosition.getInstance().recordMove(event.startSquare, event.endSquare);
     var newPosition = ChessPosition.getInstance().currentPosition;
@@ -66,32 +66,37 @@ class ChessBloc extends Bloc<ChessEvent, ChessBoardState> {
 
   void ownMoveHandler(OwnPieceMoved event, Emitter<ChessBoardState> emit) {
     log('ownMoveHandler()');
-    ChessPosition.getInstance().recordMove(event.startSquare, event.endSquare);
 
     var start = ApiCoordinate(
         col: event.startSquare.column, row: event.startSquare.row);
     var end =
         ApiCoordinate(col: event.endSquare.column, row: event.endSquare.row);
-    var move = ApiMove(startSquare: start, endSquare: end);
-    var message =
-        ApiWebsocketMessage(type: MessageType.move, move: move, color: null);
+    var apiMove = ApiMove(startSquare: start, endSquare: end);
+    var apiMessage = ApiWebsocketMessage(
+        type: MessageType.move, move: apiMove, color: null, reason: null);
 
-    ServerConnection.getInstance().send(jsonEncode(message));
+    ServerConnection.getInstance().send(jsonEncode(apiMessage));
 
-    turnColor = state.newTurnColor == ChessColor.white
-        ? ChessColor.black
-        : ChessColor.white;
-
-    var newPosition = ChessPosition.getInstance().currentPosition;
+    //Temporary chess position until server responds with acknoledgement
+    var move = ChessMove.fromApiMove(apiMove);
+    var tempPosition = ChessPosition.getInstance().copyOfCurrentPosition;
+    tempPosition[move.to] = tempPosition[move.from] ?? const ChessPiece.none();
+    tempPosition[move.from] = const ChessPiece.none();
 
     emit(
       ChessBoardState(
         state.bottomColor,
         turnColor,
-        newPosition,
+        tempPosition,
       ),
     );
   }
+
+  void invalidMoveHandler(
+      InvalidMovePlayed event, Emitter<ChessBoardState> emit) {
+    emit(ChessBoardState(state.bottomColor, turnColor,
+        ChessPosition.getInstance().currentPosition));
+  }
 }
 
 class ChessBoardState {

lib/chess_bloc/chess_events.dart

@@ -2,11 +2,11 @@ import 'package:mchess/utils/chess_utils.dart';
 
 abstract class ChessEvent {}
 
-class OpponentPieceMoved extends ChessEvent {
+class ReceivedMove extends ChessEvent {
   final ChessCoordinate startSquare;
   final ChessCoordinate endSquare;
 
-  OpponentPieceMoved({required this.startSquare, required this.endSquare});
+  ReceivedMove({required this.startSquare, required this.endSquare});
 }
 
 class OwnPieceMoved extends ChessEvent {
@@ -25,3 +25,9 @@ class ColorDetermined extends ChessEvent {
 
   ColorDetermined({required this.myColor});
 }
+
+class InvalidMovePlayed extends ChessEvent {
+  final ChessMove move;
+
+  InvalidMovePlayed({required this.move});
+}

lib/chess_bloc/chess_position.dart

@@ -20,6 +20,7 @@ class ChessPosition {
   }
 
   ChessPositionType get currentPosition => position;
+  ChessPositionType get copyOfCurrentPosition => Map.from(position);
   ChessMove? get lastMove {
     if (history.isEmpty) return null;
     return history.last;
@@ -103,7 +104,7 @@ class ChessPosition {
       logString = '$logString\n';
     }
 
-    log(logString);
+    print(logString);
   }
 
   void logHistory(ChessMoveHistory hist) {

lib/connection/ws_connection.dart

@@ -69,6 +69,9 @@ class ServerConnection {
       case MessageType.move:
         handleIncomingMoveMessage(apiMessage);
         break;
+
+      case MessageType.invalidMove:
+        handleInvalidMoveMessage(apiMessage);
     }
   }
 
@@ -79,11 +82,13 @@ class ServerConnection {
 
   void handleIncomingMoveMessage(ApiWebsocketMessage apiMessage) {
     var move = ChessMove.fromApiMove(apiMessage.move!);
-    if (move == ChessPosition.getInstance().lastMove) {
-      //This is our own move that got resent by the server. Do not process.
-    } else {
-      ChessBloc.getInstance()
-          .add(OpponentPieceMoved(startSquare: move.from, endSquare: move.to));
-    }
+    ChessBloc.getInstance()
+        .add(ReceivedMove(startSquare: move.from, endSquare: move.to));
+  }
+
+  void handleInvalidMoveMessage(ApiWebsocketMessage apiMessage) {
+    log("invalid move message received, with move: ${apiMessage.move.toString()}");
+    ChessBloc.getInstance()
+        .add(InvalidMovePlayed(move: ChessMove.fromApiMove(apiMessage.move!)));
   }
 }

pubspec.lock

@@ -144,14 +144,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.0.2"
-  js:
-    dependency: transitive
-    description:
-      name: js
-      sha256: f2c445dce49627136094980615a031419f7f3eb393237e4ecd97ac15dea343f3
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.6.7"
   lints:
     dependency: transitive
     description:
@@ -341,6 +333,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.4"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: dc8ccd225a2005c1be616fe02951e2e342092edf968cf0844220383757ef8f10
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.4-beta"
   web_socket_channel:
     dependency: "direct main"
     description:
@@ -358,5 +358,5 @@ packages:
     source: hosted
     version: "6.3.0"
 sdks:
-  dart: ">=3.0.0 <4.0.0"
+  dart: ">=3.1.0-185.0.dev <4.0.0"
   flutter: ">=3.7.0-0"

web/index.html

@@ -24,7 +24,7 @@
   <meta name="apple-mobile-web-app-capable" content="yes">
   <meta name="apple-mobile-web-app-status-bar-style" content="black">
   <meta name="apple-mobile-web-app-title" content="mchess">
-  <link rel="apple-touch-icon" href="icons/Icon-192.png">
+  <link rel="apple-touch-icon" href="web_icons/Icon-192.png">
 
   <!-- Favicon -->
   <link rel="icon" type="image/png" href="favicon.png"/>
@@ -40,20 +40,85 @@
   <script src="flutter.js" defer></script>
 </head>
 <body>
-  <script>
-    window.addEventListener('load', function(ev) {
-      // Download main.dart.js
-      _flutter.loader.loadEntrypoint({
-        serviceWorker: {
-          serviceWorkerVersion: serviceWorkerVersion,
-        },
-        onEntrypointLoaded: function(engineInitializer) {
-          engineInitializer.initializeEngine().then(function(appRunner) {
-            appRunner.runApp();
-          });
-        }
-      });
-    });
-  </script>
+</script>
+
+<!-- Loading indicator -->
+<div id="loading">
+  <style>
+	body {
+	  inset: 0;
+	  overflow: hidden;
+	  margin: 0;
+	  padding: 0;
+	  position: fixed;
+	}
+
+	#loading {
+	  align-items: center;
+	  display: flex;
+	  height: 100%;
+	  justify-content: center;
+	  width: 100%;
+	}
+
+	#loading img {
+	  animation: 1s ease-in-out 0s infinite alternate breathe;
+	  opacity: .66;
+	  transition: opacity .4s;
+	}
+
+	#loading.main_done img {
+	  opacity: 1;
+	}
+
+	#loading.init_done img {
+	  animation: .33s ease-in-out 0s 1 forwards zooooom;
+	  opacity: .05;
+	}
+
+	@keyframes breathe {
+	  from {
+		transform: scale(1)
+	  }
+
+	  to {
+		transform: scale(0.95)
+	  }
+	}
+
+	@keyframes zooooom {
+	  from {
+		transform: scale(1)
+	  }
+
+	  to {
+		transform: scale(10)
+	  }
+	}
+  </style>
+  <img src="web_icons/Icon-192.png" alt="Loading indicator..." />
+</div>
+<script>
+  window.addEventListener('load', function () {
+	var loading = document.querySelector('#loading');
+	_flutter.loader.loadEntrypoint({
+	  serviceWorker: {
+		serviceWorkerVersion: serviceWorkerVersion,
+	  }
+	}).then(function (engineInitializer) {
+	  loading.classList.add('main_done');
+	  return engineInitializer.initializeEngine();
+	}).then(function (appRunner) {
+	  loading.classList.add('init_done');
+	  return appRunner.runApp();
+	}).then(function (app) {
+	  // Wait a few milliseconds so users can see the "zoooom" animation
+	  // before getting rid of the "loading" div.
+	  window.setTimeout(function () {
+		loading.remove();
+	  }, 200);
+	});
+  });
+</script>
 </body>
 </html>

web/manifest.json

@@ -10,23 +10,23 @@
     "prefer_related_applications": false,
     "icons": [
         {
-            "src": "icons/Icon-192.png",
+            "src": "web_icons/Icon-192.png",
             "sizes": "192x192",
             "type": "image/png"
         },
         {
-            "src": "icons/Icon-512.png",
+            "src": "web_icons/Icon-512.png",
             "sizes": "512x512",
             "type": "image/png"
         },
         {
-            "src": "icons/Icon-maskable-192.png",
+            "src": "web_icons/Icon-maskable-192.png",
             "sizes": "192x192",
             "type": "image/png",
             "purpose": "maskable"
         },
         {
-            "src": "icons/Icon-maskable-512.png",
+            "src": "web_icons/Icon-maskable-512.png",
             "sizes": "512x512",
             "type": "image/png",
             "purpose": "maskable"