Groundwork for move history

lib/chess_bloc/chess_position.dart

@@ -23,6 +23,7 @@ class ChessPositionManager {
     if (history.isEmpty) return null;
     return history.last;
   }
+  ChessMoveHistory get allMoves => history;
 
   ChessPosition fromPGNString(String pgn) {
     ChessPosition pos = {};

lib/pages/chess_game.dart

@@ -6,6 +6,7 @@ import 'package:mchess/chess_bloc/chess_bloc.dart';
 import 'package:mchess/chess/chess_board.dart';
 import 'package:mchess/chess_bloc/promotion_bloc.dart';
 import 'package:mchess/utils/chess_utils.dart';
+import 'package:mchess/utils/widgets/move_history_widget.dart';
 import 'package:mchess/utils/widgets/promotion_dialog.dart';
 import 'package:uuid/uuid.dart';
 
@@ -43,8 +44,23 @@ class _ChessGameState extends State<ChessGame> {
             },
             child: BlocBuilder<ChessBloc, ChessBoardState>(
               builder: (context, state) {
-                return ChessBoard(
-                  boardState: state,
+                return Row(
+                  children: [
+                    Expanded(
+                      flex: 1,
+                      child: Container(),
+                    ),
+                    Expanded(
+                      flex: 3,
+                      child: ChessBoard(boardState: state),
+                    ),
+                    const Expanded(
+                      flex: 1,
+                      child: Align(
+                          alignment: Alignment.centerLeft,
+                          child: MoveHistory()),
+                    ),
+                  ],
                 );
               },
             ),

lib/utils/chess_utils.dart

@@ -115,30 +115,54 @@ Map<ChessPieceAssetKey, String> chessPiecesShortName = {
 };
 
 Map<ChessPieceAssetKey, String> pieceCharacter = {
-  ChessPieceAssetKey(pieceClass: ChessPieceClass.pawn, color: ChessColor.white):
-      "♙",
-  ChessPieceAssetKey(pieceClass: ChessPieceClass.rook, color: ChessColor.white):
-      "♖",
   ChessPieceAssetKey(
-      pieceClass: ChessPieceClass.knight, color: ChessColor.white): "♘",
+    pieceClass: ChessPieceClass.pawn,
+    color: ChessColor.white,
+  ): "♙",
   ChessPieceAssetKey(
-      pieceClass: ChessPieceClass.bishop, color: ChessColor.white): "♗",
-  ChessPieceAssetKey(pieceClass: ChessPieceClass.king, color: ChessColor.white):
-      "♔",
+    pieceClass: ChessPieceClass.rook,
+    color: ChessColor.white,
+  ): "♖",
   ChessPieceAssetKey(
-      pieceClass: ChessPieceClass.queen, color: ChessColor.white): "♕",
-  ChessPieceAssetKey(pieceClass: ChessPieceClass.pawn, color: ChessColor.black):
-      "♟︎",
-  ChessPieceAssetKey(pieceClass: ChessPieceClass.rook, color: ChessColor.black):
-      "♜",
+    pieceClass: ChessPieceClass.knight,
+    color: ChessColor.white,
+  ): "♘",
   ChessPieceAssetKey(
-      pieceClass: ChessPieceClass.knight, color: ChessColor.black): "♞",
+    pieceClass: ChessPieceClass.bishop,
+    color: ChessColor.white,
+  ): "♗",
   ChessPieceAssetKey(
-      pieceClass: ChessPieceClass.bishop, color: ChessColor.black): "♝",
-  ChessPieceAssetKey(pieceClass: ChessPieceClass.king, color: ChessColor.black):
-      "♚",
+    pieceClass: ChessPieceClass.king,
+    color: ChessColor.white,
+  ): "♔",
   ChessPieceAssetKey(
-      pieceClass: ChessPieceClass.queen, color: ChessColor.black): "♛",
+    pieceClass: ChessPieceClass.queen,
+    color: ChessColor.white,
+  ): "♕",
+  ChessPieceAssetKey(
+    pieceClass: ChessPieceClass.pawn,
+    color: ChessColor.black,
+  ): "♟︎",
+  ChessPieceAssetKey(
+    pieceClass: ChessPieceClass.rook,
+    color: ChessColor.black,
+  ): "♜",
+  ChessPieceAssetKey(
+    pieceClass: ChessPieceClass.knight,
+    color: ChessColor.black,
+  ): "♞",
+  ChessPieceAssetKey(
+    pieceClass: ChessPieceClass.bishop,
+    color: ChessColor.black,
+  ): "♝",
+  ChessPieceAssetKey(
+    pieceClass: ChessPieceClass.king,
+    color: ChessColor.black,
+  ): "♚",
+  ChessPieceAssetKey(
+    pieceClass: ChessPieceClass.queen,
+    color: ChessColor.black,
+  ): "♛",
 };
 
 Map<String, ChessPiece> pieceFromShortname = {

lib/utils/widgets/move_history_widget.dart

@@ -12,42 +12,78 @@ class MoveHistory extends StatefulWidget {
 }
 
 class _MoveHistoryState extends State<MoveHistory> {
-  late List<String> entries;
+  ChessMoveHistory allMoves = [];
+  List<HistoryEntry> entries = [];
 
   @override
   void initState() {
-    entries = [];
     super.initState();
   }
 
   @override
   Widget build(BuildContext context) {
-    return BlocListener<ChessBloc, ChessBoardState>(
-      listener: (context, state) {
-        List<String> newEntries = [];
-        var positionManager = ChessPositionManager.getInstance();
-        var allMoves = positionManager.allMoves;
+    return BlocBuilder<ChessBloc, ChessBoardState>(builder: (context, state) {
+      //We do not use the state, we just use the ChessBloc as a trigger
+      var positionManager = ChessPositionManager.getInstance();
+      if (positionManager.lastMove == null) return Container();
+      var pieceMoved = positionManager.getPieceAt(positionManager.lastMove!.to);
+      var pieceChar = pieceCharacter[ChessPieceAssetKey(
+          //we take the opposite color because we use dark theme. White pieces appear black and vice versa.
+          pieceClass: pieceMoved!.pieceClass,
+          color: pieceMoved.color.getOpposite())];
 
-        for (ChessMove move in allMoves) {
-          var movedPiece = positionManager.getPieceAt(move.to);
-          var char = pieceCharacter[ChessPieceAssetKey(
-              pieceClass: movedPiece!.pieceClass,
-              color: movedPiece.color.getOpposite())];
+      if (pieceMoved.color == ChessColor.white) {
+        var entry = HistoryEntry();
+        entry.setWhite(
+            pieceChar!, positionManager.lastMove!.to.toAlphabetical());
+        entries.add(entry);
+      } else {
+        var entry = entries.last;
+        entry.setBlack(
+            pieceChar!, positionManager.lastMove!.to.toAlphabetical());
+      }
 
-          if (movedPiece.color == ChessColor.white) {
-            newEntries.add("$char ${move.to.toAlphabetical()}");
-          } else {
-            newEntries.last =
-                "${newEntries.last}\t\t$char${move.to.toAlphabetical()}";
-          }
-        }
-        setState(() {
-          entries = newEntries;
-        });
-      },
-      child: ListView(children: [
-        for (var entry in entries) Text(entry),
-      ]),
-    );
+      return ListView.builder(
+        itemCount: entries.length,
+        itemBuilder: (context, index) {
+          return Text(
+            entries[index].toString(),
+            style: const TextStyle(fontSize: 20),
+          );
+        },
+      );
+    });
+  }
+}
+
+class HistoryEntry {
+  String? wChar;
+  String? wTo;
+  String? bChar;
+  String? bTo;
+
+  HistoryEntry();
+
+  void setWhite(String char, to) {
+    wChar = char;
+    wTo = to;
+  }
+
+  void setBlack(String char, to) {
+    bChar = char;
+    bTo = to;
+  }
+
+  @override
+  String toString() {
+    String entry = "";
+    if (wChar != null) {
+      entry = "$entry$wChar$wTo";
+    }
+    if (bChar != null) {
+      entry = "$entry\t\t$bChar$bTo";
+    }
+
+    return entry;
   }
 }