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ML-72 buildPreview() was called on a disposed CameraController (#73)

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* added `DeinitializeEvent`

* typo
This commit is contained in:
Vadim 2023-05-19 11:12:10 +02:00 committed by GitHub
parent 00b2728453
commit 8b74c4e1a4
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2 changed files with 24 additions and 21 deletions
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41
lib/screens/metering/components/camera_container/bloc_container_camera.dart
View file

@ -23,8 +23,7 @@ import 'package:lightmeter/utils/log_2.dart';
class CameraContainerBloc extends EvSourceBlocBase<CameraContainerEvent, CameraContainerState> { class CameraContainerBloc extends EvSourceBlocBase<CameraContainerEvent, CameraContainerState> {
final MeteringInteractor _meteringInteractor; final MeteringInteractor _meteringInteractor;
late final _WidgetsBindingObserver _observer; late final _WidgetsBindingObserver _observer;
CameraController? _cameraController; late CameraController _cameraController;
CameraController? get cameraController => _cameraController;
static const _maxZoom = 7.0; static const _maxZoom = 7.0;
RangeValues? _zoomRange; RangeValues? _zoomRange;
@ -50,6 +49,7 @@ class CameraContainerBloc extends EvSourceBlocBase<CameraContainerEvent, CameraC
on<RequestPermissionEvent>(_onRequestPermission); on<RequestPermissionEvent>(_onRequestPermission);
on<OpenAppSettingsEvent>(_onOpenAppSettings); on<OpenAppSettingsEvent>(_onOpenAppSettings);
on<InitializeEvent>(_onInitialize); on<InitializeEvent>(_onInitialize);
on<DeinitializeEvent>(_onDeinitialize);
on<ZoomChangedEvent>(_onZoomChanged); on<ZoomChangedEvent>(_onZoomChanged);
on<ExposureOffsetChangedEvent>(_onExposureOffsetChanged); on<ExposureOffsetChangedEvent>(_onExposureOffsetChanged);
on<ExposureOffsetResetEvent>(_onExposureOffsetResetEvent); on<ExposureOffsetResetEvent>(_onExposureOffsetResetEvent);
@ -60,7 +60,7 @@ class CameraContainerBloc extends EvSourceBlocBase<CameraContainerEvent, CameraC
@override @override
Future<void> close() async { Future<void> close() async {
WidgetsBinding.instance.removeObserver(_observer); WidgetsBinding.instance.removeObserver(_observer);
unawaited(_cameraController?.dispose()); unawaited(_cameraController.dispose());
communicationBloc.add(communication_event.MeteringEndedEvent(_ev100)); communicationBloc.add(communication_event.MeteringEndedEvent(_ev100));
return super.close(); return super.close();
} }
@ -118,30 +118,30 @@ class CameraContainerBloc extends EvSourceBlocBase<CameraContainerEvent, CameraC
enableAudio: false, enableAudio: false,
); );
await _cameraController!.initialize(); await _cameraController.initialize();
await _cameraController!.setFlashMode(FlashMode.off); await _cameraController.setFlashMode(FlashMode.off);
_zoomRange = await Future.wait<double>([ _zoomRange = await Future.wait<double>([
_cameraController!.getMinZoomLevel(), _cameraController.getMinZoomLevel(),
_cameraController!.getMaxZoomLevel(), _cameraController.getMaxZoomLevel(),
]).then((levels) => RangeValues(levels[0], math.min(_maxZoom, levels[1]))); ]).then((levels) => RangeValues(levels[0], math.min(_maxZoom, levels[1])));
_currentZoom = _zoomRange!.start; _currentZoom = _zoomRange!.start;
_exposureOffsetRange = await Future.wait<double>([ _exposureOffsetRange = await Future.wait<double>([
_cameraController!.getMinExposureOffset(), _cameraController.getMinExposureOffset(),
_cameraController!.getMaxExposureOffset(), _cameraController.getMaxExposureOffset(),
]).then( ]).then(
(levels) => RangeValues( (levels) => RangeValues(
math.max(_exposureMaxRange.start, levels[0]), math.max(_exposureMaxRange.start, levels[0]),
math.min(_exposureMaxRange.end, levels[1]), math.min(_exposureMaxRange.end, levels[1]),
), ),
); );
await _cameraController!.getExposureOffsetStepSize().then((value) { await _cameraController.getExposureOffsetStepSize().then((value) {
_exposureStep = value == 0 ? 0.1 : value; _exposureStep = value == 0 ? 0.1 : value;
}); });
_currentExposureOffset = 0.0; _currentExposureOffset = 0.0;
emit(CameraInitializedState(_cameraController!)); emit(CameraInitializedState(_cameraController));
_emitActiveState(emit); _emitActiveState(emit);
} catch (e) { } catch (e) {
@ -149,14 +149,19 @@ class CameraContainerBloc extends EvSourceBlocBase<CameraContainerEvent, CameraC
} }
} }
Future<void> _onDeinitialize(DeinitializeEvent _, Emitter emit) async {
emit(const CameraLoadingState());
unawaited(_cameraController.dispose());
}
Future<void> _onZoomChanged(ZoomChangedEvent event, Emitter emit) async { Future<void> _onZoomChanged(ZoomChangedEvent event, Emitter emit) async {
_cameraController!.setZoomLevel(event.value); _cameraController.setZoomLevel(event.value);
_currentZoom = event.value; _currentZoom = event.value;
_emitActiveState(emit); _emitActiveState(emit);
} }
Future<void> _onExposureOffsetChanged(ExposureOffsetChangedEvent event, Emitter emit) async { Future<void> _onExposureOffsetChanged(ExposureOffsetChangedEvent event, Emitter emit) async {
_cameraController!.setExposureOffset(event.value); _cameraController.setExposureOffset(event.value);
_currentExposureOffset = event.value; _currentExposureOffset = event.value;
_emitActiveState(emit); _emitActiveState(emit);
} }
@ -178,13 +183,12 @@ class CameraContainerBloc extends EvSourceBlocBase<CameraContainerEvent, CameraC
); );
} }
bool get _canTakePhoto => !(_cameraController == null || bool get _canTakePhoto =>
!_cameraController!.value.isInitialized || !(!_cameraController.value.isInitialized || _cameraController.value.isTakingPicture);
_cameraController!.value.isTakingPicture);
Future<double?> _takePhoto() async { Future<double?> _takePhoto() async {
try { try {
final file = await _cameraController!.takePicture(); final file = await _cameraController.takePicture();
final Uint8List bytes = await file.readAsBytes(); final Uint8List bytes = await file.readAsBytes();
Directory(file.path).deleteSync(recursive: true); Directory(file.path).deleteSync(recursive: true);
@ -213,8 +217,7 @@ class CameraContainerBloc extends EvSourceBlocBase<CameraContainerEvent, CameraC
add(const InitializeEvent()); add(const InitializeEvent());
case AppLifecycleState.paused: case AppLifecycleState.paused:
case AppLifecycleState.detached: case AppLifecycleState.detached:
_cameraController?.dispose(); add(const DeinitializeEvent());
_cameraController = null;
default: default:
} }
} }

4
lib/screens/metering/components/camera_container/event_container_camera.dart
View file

@ -14,8 +14,8 @@ class InitializeEvent extends CameraContainerEvent {
const InitializeEvent(); const InitializeEvent();
} }
class ReinitializeEvent extends CameraContainerEvent { class DeinitializeEvent extends CameraContainerEvent {
const ReinitializeEvent(); const DeinitializeEvent();
} }
class ZoomChangedEvent extends CameraContainerEvent { class ZoomChangedEvent extends CameraContainerEvent {