Created
March 13, 2023 11:56
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Flame memory leak reproducible code
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import 'package:flame/components.dart'; | |
import 'package:flame/effects.dart'; | |
import 'package:flame/game.dart'; | |
import 'package:flame_bloc/flame_bloc.dart'; | |
import 'package:flutter/material.dart'; | |
import 'package:flutter_bloc/flutter_bloc.dart'; | |
void main() { | |
runApp(const MyApp()); | |
} | |
class MyApp extends StatelessWidget { | |
const MyApp({super.key}); | |
@override | |
Widget build(BuildContext context) { | |
return BlocProvider<MyCubit>( | |
create: (BuildContext context) => MyCubit(), | |
child: const MaterialApp( | |
home: HomePage(), | |
), | |
); | |
} | |
} | |
class HomePage extends StatelessWidget { | |
const HomePage({Key? key}) : super(key: key); | |
@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
body: Center( | |
child: TextButton( | |
onPressed: () { | |
Navigator.of(context).push( | |
MaterialPageRoute(builder: (context) => const GamePage()), | |
); | |
}, | |
child: const Text('Play'), | |
), | |
), | |
appBar: AppBar(title: const Text('HomePage')), | |
); | |
} | |
} | |
class GamePage extends StatefulWidget { | |
const GamePage({Key? key}) : super(key: key); | |
@override | |
State<GamePage> createState() => _GamePageState(); | |
} | |
class _GamePageState extends State<GamePage> { | |
late final MyGame _game; | |
@override | |
void initState() { | |
super.initState(); | |
_game = MyGame(BlocProvider.of<MyCubit>(context)); | |
} | |
@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
body: GameWidget(game: _game), | |
appBar: AppBar(title: const Text('GamePage')), | |
floatingActionButton: FloatingActionButton( | |
onPressed: () { | |
BlocProvider.of<MyCubit>(context).increase(); | |
}, | |
child: const Icon(Icons.add), | |
), | |
); | |
} | |
} | |
class MyCubit extends Cubit<int> { | |
MyCubit() : super(0); | |
void increase() { | |
emit(state + 1); | |
} | |
} | |
class MyGame extends FlameGame { | |
MyGame(this.myCubit); | |
final MyCubit myCubit; | |
@override | |
void onMount() { | |
add( | |
FlameBlocProvider<MyCubit, int>.value( | |
value: myCubit, | |
children: [ | |
LeakingCounterComponent(), | |
], | |
), | |
); | |
super.onMount(); | |
} | |
@override | |
void onRemove() { | |
print('MyGame.onRemove()'); | |
// Uncomment below code to fix the memory leak issue | |
// removeAll(children); | |
// processPendingLifecycleEvents(); | |
super.onRemove(); | |
} | |
} | |
class LeakingCounterComponent extends TextComponent | |
with HasGameRef<FlameGame>, FlameBlocListenable<MyCubit, int> { | |
@override | |
void onMount() { | |
super.onMount(); | |
mounted.then((value) { | |
text = bloc.state.toString(); | |
}); | |
textRenderer = TextPaint( | |
style: const TextStyle( | |
color: Colors.white, | |
fontSize: 80, | |
), | |
); | |
position = game.size / 2; | |
anchor = Anchor.center; | |
add(ScaleEffect.to( | |
Vector2.all(2), | |
EffectController( | |
duration: 0.6, | |
infinite: true, | |
alternate: true, | |
), | |
)); | |
} | |
@override | |
void onNewState(int state) { | |
text = state.toString(); | |
print('LeakingCounterComponent.onNewState($state)'); | |
super.onNewState(state); | |
} | |
@override | |
void onRemove() { | |
print('LeakingCounterComponent.onRemove()'); | |
super.onRemove(); | |
} | |
} |
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