KazukyAkayashi/m3_lightmeter
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added MeteringBloc

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This commit is contained in:
Vadim 2022-10-29 21:02:45 +03:00
parent 888a9a6a76
commit b6e377959f
9 changed files with 199 additions and 84 deletions
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18
lib/main.dart
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@ -1,6 +1,9 @@
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'models/photography_value.dart';
import 'res/theme.dart';
import 'screens/metering/metering_bloc.dart';
import 'screens/metering/metering_screen.dart';
void main() {
@ -12,13 +15,16 @@ class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
useMaterial3: true,
colorScheme: lightColorScheme,
return BlocProvider(
create: (context) => MeteringBloc(Stop.third),
child: MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
useMaterial3: true,
colorScheme: lightColorScheme,
),
home: const MeteringScreen(),
),
home: const MeteringScreen(),
);
}
}

8
lib/models/exposure_pair.dart Normal file
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@ -0,0 +1,8 @@
import 'photography_value.dart';
class ExposurePair {
final ApertureValue aperture;
final ShutterSpeedValue shutterSpeed;
const ExposurePair(this.aperture, this.shutterSpeed);
}

57
lib/screens/metering/components/exposure_pairs_list/exposure_pairs_list.dart
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@ -1,56 +1,12 @@
import 'dart:math';
import 'package:flutter/material.dart';
import 'package:lightmeter/models/photography_value.dart';
import 'package:lightmeter/models/exposure_pair.dart';
import 'package:lightmeter/res/dimens.dart';
import 'package:lightmeter/screens/metering/components/exposure_pairs_list/components/exposure_pair_item.dart';
class ExposurePairsList extends StatelessWidget {
final double ev;
final Stop stopType;
final List<ApertureValue> _apertureValuesList;
final List<ShutterSpeedValue> _shutterSpeedValuesList;
late final int _apertureOffset;
late final int _shutterSpeedOffset;
late final int _itemsCount;
final List<ExposurePair> exposurePairs;
ExposurePairsList({
required this.ev,
required this.stopType,
super.key,
}) : _apertureValuesList = apertureValues.whereStopType(stopType),
_shutterSpeedValuesList = shutterSpeedValues.whereStopType(stopType) {
late final int evSteps;
switch (stopType) {
case Stop.full:
evSteps = ev.floor();
break;
case Stop.half:
evSteps = (ev / 0.5).floor();
break;
case Stop.third:
evSteps = (ev / 0.3).floor();
break;
}
final evOffset = _shutterSpeedValuesList.indexOf(const ShutterSpeedValue(1, false, Stop.full)) - evSteps;
if (evOffset >= 0) {
_apertureOffset = 0;
_shutterSpeedOffset = evOffset;
} else {
_apertureOffset = -evOffset;
_shutterSpeedOffset = 0;
}
_itemsCount = min(
_apertureValuesList.length + _shutterSpeedOffset,
_shutterSpeedValuesList.length + _apertureOffset,
) -
max(
_apertureOffset,
_shutterSpeedOffset,
);
}
const ExposurePairsList(this.exposurePairs, {super.key});
@override
Widget build(BuildContext context) {
@ -59,7 +15,8 @@ class ExposurePairsList extends StatelessWidget {
children: [
Positioned.fill(
child: ListView.builder(
itemCount: _itemsCount,
key: ValueKey(exposurePairs.hashCode),
itemCount: exposurePairs.length,
itemBuilder: (_, index) => Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
@ -67,7 +24,7 @@ class ExposurePairsList extends StatelessWidget {
child: Align(
alignment: Alignment.centerLeft,
child: ExposurePaitListItem(
_apertureValuesList[index + _apertureOffset],
exposurePairs[index].aperture,
tickOnTheLeft: false,
),
),
@ -77,7 +34,7 @@ class ExposurePairsList extends StatelessWidget {
child: Align(
alignment: Alignment.centerLeft,
child: ExposurePaitListItem(
_shutterSpeedValuesList[index + _shutterSpeedOffset],
exposurePairs[index].shutterSpeed,
tickOnTheLeft: true,
),
),

22
lib/screens/metering/components/topbar/topbar.dart
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@ -1,17 +1,21 @@
import 'package:flutter/material.dart';
import 'package:lightmeter/models/exposure_pair.dart';
import 'package:lightmeter/res/dimens.dart';
import 'package:lightmeter/screens/metering/components/topbar/components/reading_container.dart';
import 'package:lightmeter/screens/metering/components/topbar/topbar_shape.dart';
import 'package:lightmeter/utils/text_line_height.dart';
import 'components/reading_container.dart';
class MeteringTopBar extends StatelessWidget {
static const _columnsCount = 3;
final ExposurePair? fastest;
final ExposurePair? slowest;
final double ev;
final int iso;
final double nd;
const MeteringTopBar({
required this.fastest,
required this.slowest,
required this.ev,
required this.iso,
required this.nd,
@ -43,14 +47,18 @@ class MeteringTopBar extends StatelessWidget {
SizedBox(
height: columnWidth / 3 * 4,
child: ReadingContainer(
values: const [
values: [
ReadingValue(
label: 'Fastest',
value: 'f/5.6 - 1/2000',
value: fastest != null
? '${fastest!.aperture.toString()} - ${fastest!.shutterSpeed.toString()}'
: 'N/A',
),
ReadingValue(
label: 'Slowest',
value: 'f/45 - 1/30',
value: fastest != null
? '${slowest!.aperture.toString()} - ${slowest!.shutterSpeed.toString()}'
: 'N/A',
),
],
),
@ -63,7 +71,7 @@ class MeteringTopBar extends StatelessWidget {
child: ReadingContainer.singleValue(
value: ReadingValue(
label: 'EV',
value: ev.toString(),
value: ev.toStringAsFixed(1),
),
),
),

90
lib/screens/metering/metering_bloc.dart Normal file
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@ -0,0 +1,90 @@
import 'dart:math';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:lightmeter/models/exposure_pair.dart';
import 'package:lightmeter/models/photography_value.dart';
import 'metering_event.dart';
import 'metering_state.dart';
class MeteringBloc extends Bloc<MeteringEvent, MeteringState> {
final Stop stopType;
late final _apertureValues = apertureValues.whereStopType(stopType);
late final _shutterSpeedValues = shutterSpeedValues.whereStopType(stopType);
late final _isoValues = isoValues.whereStopType(stopType);
final _random = Random();
MeteringBloc(this.stopType)
: super(
const MeteringState(
iso: 100,
ev: 21.3,
evCompensation: 0.0,
nd: 0.0,
exposurePairs: [],
),
) {
on<MeasureEvent>(_onMeasure);
add(const MeasureEvent());
}
/// https://stackoverflow.com/questions/5401738/how-to-convert-between-lux-and-exposure-value
void _onMeasure(_, Emitter emit) {
double log2(double x) => log(x) / log(2);
final aperture = _apertureValues[_random.nextInt(_apertureValues.length)];
final shutterSpeed = _shutterSpeedValues[_random.nextInt(_shutterSpeedValues.thirdStops().length)];
final iso = _isoValues[_random.nextInt(_isoValues.thirdStops().length)];
final evAtSystemIso = log2(pow(aperture.value, 2).toDouble()) - log2(shutterSpeed.value);
final ev = evAtSystemIso - log2(iso.value / state.iso);
final exposurePairs = _buildExposureValues(ev);
emit(MeteringState(
iso: state.iso,
ev: ev,
evCompensation: state.evCompensation,
nd: state.nd,
exposurePairs: exposurePairs,
));
}
List<ExposurePair> _buildExposureValues(double ev) {
late final int evSteps;
switch (stopType) {
case Stop.full:
evSteps = ev.floor();
break;
case Stop.half:
evSteps = (ev / 0.5).floor();
break;
case Stop.third:
evSteps = (ev / 0.3).floor();
break;
}
final evOffset = _shutterSpeedValues.indexOf(const ShutterSpeedValue(1, false, Stop.full)) - evSteps;
late final int apertureOffset;
late final int shutterSpeedOffset;
if (evOffset >= 0) {
apertureOffset = 0;
shutterSpeedOffset = evOffset;
} else {
apertureOffset = -evOffset;
shutterSpeedOffset = 0;
}
int itemsCount = min(_apertureValues.length + shutterSpeedOffset, _shutterSpeedValues.length + apertureOffset) -
max(apertureOffset, shutterSpeedOffset);
return List.generate(
itemsCount,
(index) => ExposurePair(
_apertureValues[index + apertureOffset],
_shutterSpeedValues[index + shutterSpeedOffset],
),
growable: false,
);
}
}

7
lib/screens/metering/metering_event.dart Normal file
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@ -0,0 +1,7 @@
abstract class MeteringEvent {
const MeteringEvent();
}
class MeasureEvent extends MeteringEvent {
const MeasureEvent();
}

60
lib/screens/metering/metering_screen.dart
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@ -1,37 +1,55 @@
import 'package:flutter/material.dart';
import 'package:lightmeter/models/photography_value.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:lightmeter/res/dimens.dart';
import 'package:lightmeter/screens/metering/metering_event.dart';
import 'components/bottom_controls/bottom_controls.dart';
import 'components/exposure_pairs_list/exposure_pairs_list.dart';
import 'components/topbar/topbar.dart';
import 'metering_bloc.dart';
import 'metering_state.dart';
class MeteringScreen extends StatelessWidget {
const MeteringScreen({super.key});
@override
Widget build(BuildContext context) {
const ev = 0.3;
return Scaffold(
backgroundColor: Theme.of(context).colorScheme.background,
body: Column(
children: [
const MeteringTopBar(
ev: ev,
iso: 6400,
nd: 0,
),
Expanded(
child: ExposurePairsList(
ev: ev,
stopType: Stop.third,
),
),
MeteringBottomControls(
onSourceChanged: () {},
onMeasure: () {},
onSettings: () {},
),
],
body: BlocBuilder<MeteringBloc, MeteringState>(
builder: (context, state) {
return Column(
children: [
MeteringTopBar(
fastest: state.fastest,
slowest: state.slowest,
ev: state.ev,
iso: state.iso,
nd: state.nd,
),
Expanded(
child: Padding(
padding: const EdgeInsets.symmetric(horizontal: Dimens.paddingM),
child: Row(
children: [
Expanded(
flex: 2,
child: ExposurePairsList(state.exposurePairs),
),
const SizedBox(width: Dimens.grid16),
const Spacer()
],
),
),
),
MeteringBottomControls(
onSourceChanged: () {},
onMeasure: () => context.read<MeteringBloc>().add(const MeasureEvent()),
onSettings: () {},
),
],
);
},
),
);
}

20
lib/screens/metering/metering_state.dart Normal file
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@ -0,0 +1,20 @@
import 'package:lightmeter/models/exposure_pair.dart';
class MeteringState {
final double ev;
final double evCompensation;
final int iso;
final double nd;
final List<ExposurePair> exposurePairs;
const MeteringState({
required this.ev,
required this.evCompensation,
required this.iso,
required this.nd,
required this.exposurePairs,
});
ExposurePair? get fastest => exposurePairs.isEmpty ? null : exposurePairs.first;
ExposurePair? get slowest => exposurePairs.isEmpty ? null : exposurePairs.last;
}

1
pubspec.yaml
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@ -9,6 +9,7 @@ environment:
dependencies:
flutter:
sdk: flutter
flutter_bloc: ^8.1.1
material_color_utilities: ^0.2.0
dev_dependencies: