mchess-client/lib/chess_bloc/promotion_bloc.dart

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import 'package:flutter_bloc/flutter_bloc.dart';
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import 'package:mchess/chess_bloc/chess_bloc.dart';
import 'package:mchess/chess_bloc/chess_events.dart';
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import 'package:mchess/utils/chess_utils.dart';
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class PromotionBloc extends Bloc<PromotionEvent, PromotionState> {
static final PromotionBloc _instance = PromotionBloc._internal();
static late ChessMove move;
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PromotionBloc._internal() : super(PromotionState.init()) {
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on<PawnMovedToPromotionField>(promotionMoveHandler);
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on<PieceChosen>(pieceChosenHandler);
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}
void promotionMoveHandler(
PawnMovedToPromotionField event,
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Emitter<PromotionState> emit,
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) {
switch (event.colorMoved) {
case ChessColor.white:
if (event.move.from.row != 7) return;
break;
case ChessColor.black:
if (event.move.from.row != 2) return;
break;
}
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move = event.move;
emit(PromotionState(
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showPromotionDialog: true, colorMoved: event.colorMoved));
}
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void pieceChosenHandler(
PieceChosen event,
Emitter<PromotionState> emit,
) {
ChessBloc.getInstance()
.add(OwnPromotionPlayed(pieceClass: event.pieceClass, move: move));
emit(PromotionState(showPromotionDialog: false, colorMoved: event.color));
}
factory PromotionBloc.getInstance() {
return PromotionBloc();
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}
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factory PromotionBloc() {
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return _instance;
}
}
abstract class PromotionEvent {}
class PawnMovedToPromotionField extends PromotionEvent {
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final ChessMove move;
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final ChessColor colorMoved;
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PawnMovedToPromotionField({required this.move, required this.colorMoved});
}
class PieceChosen extends PromotionEvent {
final ChessPieceClass pieceClass;
final ChessColor color;
PieceChosen({required this.pieceClass, required this.color});
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}
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class PromotionState {
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final bool showPromotionDialog;
final ChessColor colorMoved;
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PromotionState({required this.showPromotionDialog, required this.colorMoved});
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factory PromotionState.init() {
return PromotionState(
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showPromotionDialog: false, colorMoved: ChessColor.white);
}
}