Make a lot of changes. CAUTION: Board flips on purpose on every move.

lib/chessapp/chess_app.dart

@@ -1,4 +1,6 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:mchess/chess_bloc/chess_bloc.dart';
 
 import 'chess_board.dart';
 
@@ -27,9 +29,15 @@ class ChessApp extends StatelessWidget {
               fit: BoxFit.contain,
               child: Container(
                 margin: const EdgeInsets.all(20),
-                child: const ChessBoard(
+                child: BlocProvider(
-                  flipped: false,
+                    create: (_) => ChessBloc.getInstance(),
-                ),
+                    child: BlocBuilder<ChessBloc, ChessBoardState>(
+                      builder: (context, state) {
+                        return ChessBoard(
+                          bState: state,
+                        );
+                      },
+                    )),
               ),
             ),
           ),

lib/chessapp/chess_board.dart

@@ -1,24 +1,17 @@
 import 'package:flutter/material.dart';
+import 'package:mchess/chess_bloc/chess_bloc.dart';
 
 import 'chess_square.dart';
 import 'chess_utils.dart';
 
-class ChessBoard extends StatefulWidget {
+class ChessBoard extends StatelessWidget {
-  final bool flipped;
+  final ChessBoardState bState;
+  final List<ChessSquare> squares;
 
-  const ChessBoard({required this.flipped, super.key});
+  ChessBoard._({required this.bState, required this.squares});
 
-  @override
+  factory ChessBoard({required ChessBoardState bState}) {
-  State<StatefulWidget> createState() => ChessBoardState();
+    List<ChessSquare> squares = List.empty(growable: true);
-}
-
-class ChessBoardState extends State<ChessBoard> {
-  var squares = <ChessSquare>[];
-
-  ChessColor turnColor = ChessColor.white;
-
-  @override
-  Widget build(BuildContext context) {
     for (int i = 0; i < 64; i++) {
       var column = (i % 8) + 1;
       var row = (i ~/ 8) + 1;
@@ -30,14 +23,22 @@ class ChessBoardState extends State<ChessBoard> {
       );
     }
 
+    return ChessBoard._(bState: bState, squares: squares);
+  }
+
+  @override
+  Widget build(BuildContext context) {
     _placePieces();
 
     return Column(
-      children: _buildBoard(widget.flipped),
+      children: _buildBoard(bState.flipped),
     );
   }
 
-  void _placePieces() {}
+  void _placePieces() {
+    squares[0].containedPiece =
+        ChessPiece(ChessPieceName.blackBishop, ChessColor.black);
+  }
 
   Row _buildChessRow(int rowNo, bool flipped) {
     if (!flipped) {

lib/chessapp/chess_square.dart

@@ -1,14 +1,15 @@
 import 'package:flutter/material.dart';
+import 'package:mchess/chess_bloc/chess_bloc.dart';
 
 import 'chess_utils.dart';
 
 class ChessSquare extends StatefulWidget {
   final ChessCoordinate coordinate;
-  final ChessPiece? containedPiece;
+  late ChessPiece? containedPiece;
   static const double pieceWidth = 200;
   static const double pieceHeight = 200;
 
-  const ChessSquare({required this.coordinate, this.containedPiece, super.key});
+  ChessSquare({required this.coordinate, this.containedPiece, super.key});
 
   @override
   State<StatefulWidget> createState() => _ChessSquareState();
@@ -53,16 +54,19 @@ class _ChessSquareState extends State<ChessSquare> {
             child: widget.containedPiece ?? Container(),
             onDragCompleted: () {
               setState(() {
-                // widget.containedPiece = null;
+                widget.containedPiece = null;
               });
             },
           ),
         );
       },
       onWillAccept: (move) {
-        return false;
+        print('onWillAccept');
+        return true;
+      },
+      onAccept: (move) {
+        ChessBloc().add(PieceMoved());
       },
-      onAccept: (move) {},
     );
   }
 

pubspec.lock

@@ -9,6 +9,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.10.0"
+  bloc:
+    dependency: transitive
+    description:
+      name: bloc
+      sha256: bd4f8027bfa60d96c8046dec5ce74c463b2c918dce1b0d36593575995344534a
+      url: "https://pub.dev"
+    source: hosted
+    version: "8.1.0"
   boolean_selector:
     dependency: transitive
     description:
@@ -62,6 +70,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_bloc:
+    dependency: "direct main"
+    description:
+      name: flutter_bloc
+      sha256: "890c51c8007f0182360e523518a0c732efb89876cb4669307af7efada5b55557"
+      url: "https://pub.dev"
+    source: hosted
+    version: "8.1.1"
   flutter_lints:
     dependency: "direct dev"
     description:
@@ -123,6 +139,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.8.0"
+  nested:
+    dependency: transitive
+    description:
+      name: nested
+      sha256: "03bac4c528c64c95c722ec99280375a6f2fc708eec17c7b3f07253b626cd2a20"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.0"
   path:
     dependency: transitive
     description:
@@ -155,6 +179,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "5.1.0"
+  provider:
+    dependency: transitive
+    description:
+      name: provider
+      sha256: e1e7413d70444ea3096815a60fe5da1b11bda8a9dc4769252cc82c53536f8bcc
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.0.4"
   sky_engine:
     dependency: transitive
     description: flutter

pubspec.yaml

@@ -36,6 +36,7 @@ dependencies:
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.2
+  flutter_bloc: ^8.1.1
 
 dev_dependencies:
   flutter_test:
@@ -60,9 +61,11 @@ flutter:
   uses-material-design: true
 
   # To add assets to your application, add an assets section, like this:
-  # assets:
+  assets:
-  #   - images/a_dot_burr.jpeg
+    - assets/
-  #   - images/a_dot_ham.jpeg
+    - assets/pieces/
+    - assets/pieces/black/
+    - assets/pieces/white/
 
   # An image asset can refer to one or more resolution-specific "variants", see
   # https://flutter.dev/assets-and-images/#resolution-aware