[Stocks App] NNBD migration, refresh gen-l10n (#79460)

dev/benchmarks/test_apps/stocks/l10n.yaml

@@ -16,3 +16,7 @@ output-localization-file: stock_strings.dart
 ## generating Flutter's localization files.
 synthetic-package: false
 template-arb-file: stocks_en.arb
+## setting `nullable-getter` to false generates a non-nullable
+## StockStrings getter. This removes the need for adding null checks
+## in the Flutter application itself.
+nullable-getter: false

dev/benchmarks/test_apps/stocks/lib/i18n/header.txt

 // Copyright 2014 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
+
+// THE FOLLLOWING FILES WERE GENERATED BY `flutter gen-l10n`.

dev/benchmarks/test_apps/stocks/lib/i18n/stock_strings.dart

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// THE FOLLLOWING FILES WERE GENERATED BY `flutter gen-l10n`.
+
 import 'dart:async';
 
 import 'package:flutter/foundation.dart';
@@ -39,7 +41,7 @@ import 'stock_strings_es.dart';
 ///   # Internationalization support.
 ///   flutter_localizations:
 ///     sdk: flutter
-///   intl: 0.16.1
+///   intl: any # Use the pinned version from flutter_localizations
 ///
 ///   # rest of dependencies
 /// ```
@@ -64,12 +66,12 @@ import 'stock_strings_es.dart';
 /// be consistent with the languages listed in the StockStrings.supportedLocales
 /// property.
 abstract class StockStrings {
-  StockStrings(String locale) : assert(locale != null), localeName = intl.Intl.canonicalizedLocale(locale.toString());
+  StockStrings(String locale) : localeName = intl.Intl.canonicalizedLocale(locale.toString());
 
   final String localeName;
 
   static StockStrings of(BuildContext context) {
-    return Localizations.of<StockStrings>(context, StockStrings);
+    return Localizations.of<StockStrings>(context, StockStrings)!;
   }
 
   static const LocalizationsDelegate<StockStrings> delegate = _StockStringsDelegate();
@@ -98,13 +100,22 @@ abstract class StockStrings {
     Locale('es')
   ];
 
-  // Title for the Stocks application
+  /// Title for the Stocks application
+  ///
+  /// In en, this message translates to:
+  /// **'Stocks'**
   String get title;
 
-  // Label for the Market tab
+  /// Label for the Market tab
+  ///
+  /// In en, this message translates to:
+  /// **'MARKET'**
   String get market;
 
-  // Label for the Portfolio tab
+  /// Label for the Portfolio tab
+  ///
+  /// In en, this message translates to:
+  /// **'PORTFOLIO'**
   String get portfolio;
 }
 
@@ -126,22 +137,27 @@ class _StockStringsDelegate extends LocalizationsDelegate<StockStrings> {
 StockStrings _lookupStockStrings(Locale locale) {
 
 
-  // Lookup logic when language+country codes are specified.
-  switch (locale.languageCode) {
-    case 'en': {
-      switch (locale.countryCode) {
-        case 'US': return StockStringsEnUs();
-      }
-      break;
-    }
+// Lookup logic when language+country codes are specified.
+switch (locale.languageCode) {
+  case 'en': {
+  switch (locale.countryCode) {
+    case 'US': return StockStringsEnUs();
   }
+  break;
+}
+}
 
-  // Lookup logic when only language code is specified.
-  switch (locale.languageCode) {
-    case 'en': return StockStringsEn();
+// Lookup logic when only language code is specified.
+switch (locale.languageCode) {
+  case 'en': return StockStringsEn();
     case 'es': return StockStringsEs();
-  }
+}
+
 
-  assert(false, 'StockStrings.delegate failed to load unsupported locale "$locale"');
-  return null;
+  throw FlutterError(
+    'StockStrings.delegate failed to load unsupported locale "$locale". This is likely '
+    'an issue with the localizations generation tool. Please file an issue '
+    'on GitHub with a reproducible sample app and the gen-l10n configuration '
+    'that was used.'
+  );
 }

dev/benchmarks/test_apps/stocks/lib/i18n/stock_strings_en.dart

@@ -2,6 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// THE FOLLLOWING FILES WERE GENERATED BY `flutter gen-l10n`.
+
+
+
 import 'stock_strings.dart';
 
 /// The translations for English (`en`).

dev/benchmarks/test_apps/stocks/lib/i18n/stock_strings_es.dart

@@ -2,6 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// THE FOLLLOWING FILES WERE GENERATED BY `flutter gen-l10n`.
+
+
+
 import 'stock_strings.dart';
 
 /// The translations for Spanish Castilian (`es`).

dev/benchmarks/test_apps/stocks/lib/main.dart

@@ -20,14 +20,14 @@ import 'stock_symbol_viewer.dart';
 import 'stock_types.dart';
 
 class StocksApp extends StatefulWidget {
-  const StocksApp({Key key}) : super(key: key);
+  const StocksApp({Key? key}) : super(key: key);
 
   @override
   StocksAppState createState() => StocksAppState();
 }
 
 class StocksAppState extends State<StocksApp> {
-  StockData stocks;
+  late StockData stocks = StockData();
 
   StockConfiguration _configuration = StockConfiguration(
     stockMode: StockMode.optimistic,
@@ -42,12 +42,6 @@ class StocksAppState extends State<StocksApp> {
     showSemanticsDebugger: false,
   );
 
-  @override
-  void initState() {
-    super.initState();
-    stocks = StockData();
-  }
-
   void configurationUpdater(StockConfiguration value) {
     setState(() {
       _configuration = value;
@@ -67,16 +61,14 @@ class StocksAppState extends State<StocksApp> {
           primarySwatch: Colors.purple,
         );
     }
-    assert(_configuration.stockMode != null);
-    return null;
   }
 
-  Route<dynamic> _getRoute(RouteSettings settings) {
+  Route<dynamic>? _getRoute(RouteSettings settings) {
     if (settings.name == '/stock') {
-      final String symbol = settings.arguments as String;
+      final String? symbol = settings.arguments as String?;
       return MaterialPageRoute<void>(
         settings: settings,
-        builder: (BuildContext context) => StockSymbolPage(symbol: symbol, stocks: stocks),
+        builder: (BuildContext context) => StockSymbolPage(symbol: symbol!, stocks: stocks),
       );
     }
     // The other paths we support are in the routes table.

dev/benchmarks/test_apps/stocks/lib/stock_arrow.dart

@@ -7,7 +7,10 @@ import 'dart:math' as math;
 import 'package:flutter/material.dart';
 
 class StockArrowPainter extends CustomPainter {
-  StockArrowPainter({ this.color, this.percentChange });
+  StockArrowPainter({
+    required this.color,
+    required this.percentChange,
+  });
 
   final Color color;
   final double percentChange;
@@ -53,7 +56,7 @@ class StockArrowPainter extends CustomPainter {
 }
 
 class StockArrow extends StatelessWidget {
-  const StockArrow({ Key key, this.percentChange }) : super(key: key);
+  const StockArrow({ Key? key, required this.percentChange }) : super(key: key);
 
   final double percentChange;
 
@@ -65,8 +68,8 @@ class StockArrow extends StatelessWidget {
 
   Color _colorForPercentChange(double percentChange) {
     if (percentChange > 0)
-      return Colors.green[_colorIndexForPercentChange(percentChange)];
-    return Colors.red[_colorIndexForPercentChange(percentChange)];
+      return Colors.green[_colorIndexForPercentChange(percentChange)]!;
+    return Colors.red[_colorIndexForPercentChange(percentChange)]!;
   }
 
   @override

dev/benchmarks/test_apps/stocks/lib/stock_data.dart

@@ -31,11 +31,11 @@ class Stock {
     percentChange = (_rng.nextDouble() * 20) - 10;
   }
 
-  String symbol;
-  String name;
-  double lastSale;
-  String marketCap;
-  double percentChange;
+  late String symbol;
+  late String name;
+  late double lastSale;
+  late String marketCap;
+  late double percentChange;
 }
 
 class StockData extends ChangeNotifier {
@@ -51,7 +51,7 @@ class StockData extends ChangeNotifier {
 
   List<String> get allSymbols => _symbols;
 
-  Stock operator [](String symbol) => _stocks[symbol];
+  Stock? operator [](String symbol) => _stocks[symbol];
 
   bool get loading => _httpClient != null;
 
@@ -71,12 +71,12 @@ class StockData extends ChangeNotifier {
   Uri _urlToFetch(int chunk) => Uri.https(
       'domokit.github.io', 'examples/stocks/data/stock_data_$chunk.json');
 
-  http.Client _httpClient;
+  http.Client? _httpClient;
 
   static bool actuallyFetchData = true;
 
   void _fetchNextChunk() {
-    _httpClient.get(_urlToFetch(_nextChunk++)).then<void>((http.Response response) {
+    _httpClient!.get(_urlToFetch(_nextChunk++)).then<void>((http.Response response) {
       final String json = response.body;
       if (json == null) {
         debugPrint('Failed to load stock data chunk ${_nextChunk - 1}');
@@ -94,7 +94,7 @@ class StockData extends ChangeNotifier {
   }
 
   void _end() {
-    _httpClient?.close();
+    _httpClient!.close();
     _httpClient = null;
   }
 }

dev/benchmarks/test_apps/stocks/lib/stock_home.dart

@@ -52,7 +52,7 @@ class _NotImplementedDialog extends StatelessWidget {
 }
 
 class StockHome extends StatefulWidget {
-  const StockHome(this.stocks, this.configuration, this.updater, {Key key}) : super(key: key);
+  const StockHome(this.stocks, this.configuration, this.updater, {Key? key}) : super(key: key);
 
   final StockData stocks;
   final StockConfiguration configuration;
@@ -69,7 +69,7 @@ class StockHomeState extends State<StockHome> {
   bool _autorefresh = false;
 
   void _handleSearchBegin() {
-    ModalRoute.of(context).addLocalHistoryEntry(LocalHistoryEntry(
+    ModalRoute.of(context)!.addLocalHistoryEntry(LocalHistoryEntry(
       onRemove: () {
         setState(() {
           _isSearching = false;
@@ -82,7 +82,7 @@ class StockHomeState extends State<StockHome> {
     });
   }
 
-  void _handleStockModeChange(StockMode value) {
+  void _handleStockModeChange(StockMode? value) {
     if (widget.updater != null)
       widget.updater(widget.configuration.copyWith(stockMode: value));
   }
@@ -231,8 +231,9 @@ class StockHomeState extends State<StockHome> {
   }
 
   static Iterable<Stock> _getStockList(StockData stocks, Iterable<String> symbols) {
-    return symbols.map<Stock>((String symbol) => stocks[symbol])
-        .where((Stock stock) => stock != null);
+    return symbols.map<Stock?>((String symbol) => stocks[symbol])
+      .where((Stock? stock) => stock != null)
+      .cast<Stock>();
   }
 
   Iterable<Stock> _filterBySearchQuery(Iterable<Stock> stocks) {
@@ -266,7 +267,7 @@ class StockHomeState extends State<StockHome> {
         Navigator.pushNamed(context, '/stock', arguments: stock.symbol);
       },
       onShow: (Stock stock) {
-        _scaffoldKey.currentState.showBottomSheet<void>((BuildContext context) => StockSymbolBottomSheet(stock: stock));
+        _scaffoldKey.currentState!.showBottomSheet<void>((BuildContext context) => StockSymbolBottomSheet(stock: stock));
       },
     );
   }
@@ -275,7 +276,7 @@ class StockHomeState extends State<StockHome> {
     return AnimatedBuilder(
       key: ValueKey<StockHomeTab>(tab),
       animation: Listenable.merge(<Listenable>[_searchQuery, widget.stocks]),
-      builder: (BuildContext context, Widget child) {
+      builder: (BuildContext context, Widget? child) {
         return _buildStockList(context, _filterBySearchQuery(_getStockList(widget.stocks, stockSymbols)).toList(), tab);
       },
     );

dev/benchmarks/test_apps/stocks/lib/stock_list.dart

@@ -8,7 +8,13 @@ import 'stock_data.dart';
 import 'stock_row.dart';
 
 class StockList extends StatelessWidget {
-  const StockList({ Key key, this.stocks, this.onOpen, this.onShow, this.onAction }) : super(key: key);
+  const StockList({
+    Key? key,
+    required this.stocks,
+    required this.onOpen,
+    required this.onShow,
+    required this.onAction,
+  }) : super(key: key);
 
   final List<Stock> stocks;
   final StockRowActionCallback onOpen;

dev/benchmarks/test_apps/stocks/lib/stock_row.dart

@@ -11,20 +11,20 @@ typedef StockRowActionCallback = void Function(Stock stock);
 
 class StockRow extends StatelessWidget {
   StockRow({
-    this.stock,
+    required this.stock,
     this.onPressed,
     this.onDoubleTap,
     this.onLongPressed,
   }) : super(key: ObjectKey(stock));
 
   final Stock stock;
-  final StockRowActionCallback onPressed;
-  final StockRowActionCallback onDoubleTap;
-  final StockRowActionCallback onLongPressed;
+  final StockRowActionCallback? onPressed;
+  final StockRowActionCallback? onDoubleTap;
+  final StockRowActionCallback? onLongPressed;
 
   static const double kHeight = 79.0;
 
-  GestureTapCallback _getHandler(StockRowActionCallback callback) {
+  GestureTapCallback? _getHandler(StockRowActionCallback? callback) {
     return callback == null ? null : () => callback(stock);
   }
 

dev/benchmarks/test_apps/stocks/lib/stock_settings.dart

@@ -7,7 +7,7 @@ import 'package:flutter/material.dart';
 import 'stock_types.dart';
 
 class StockSettings extends StatefulWidget {
-  const StockSettings(this.configuration, this.updater, {Key key}) : super(key: key);
+  const StockSettings(this.configuration, this.updater, {Key? key}) : super(key: key);
 
   final StockConfiguration configuration;
   final ValueChanged<StockConfiguration> updater;
@@ -17,7 +17,7 @@ class StockSettings extends StatefulWidget {
 }
 
 class StockSettingsState extends State<StockSettings> {
-  void _handleOptimismChanged(bool value) {
+  void _handleOptimismChanged(bool? value) {
     value ??= false;
     sendUpdates(widget.configuration.copyWith(stockMode: value ? StockMode.optimistic : StockMode.pessimistic));
   }
@@ -111,7 +111,7 @@ class StockSettingsState extends State<StockSettings> {
         onTap: _confirmOptimismChange,
         trailing: Checkbox(
           value: widget.configuration.stockMode == StockMode.optimistic,
-          onChanged: (bool value) => _confirmOptimismChange(),
+          onChanged: (bool? value) => _confirmOptimismChange(),
         ),
       ),
       ListTile(

dev/benchmarks/test_apps/stocks/lib/stock_symbol_viewer.dart

@@ -8,7 +8,10 @@ import 'stock_arrow.dart';
 import 'stock_data.dart';
 
 class _StockSymbolView extends StatelessWidget {
-  const _StockSymbolView({ this.stock, this.arrow });
+  const _StockSymbolView({
+    required this.stock,
+    required this.arrow,
+  });
 
   final Stock stock;
   final Widget arrow;
@@ -21,7 +24,7 @@ class _StockSymbolView extends StatelessWidget {
     if (stock.percentChange > 0)
       changeInPrice = '+' + changeInPrice;
 
-    final TextStyle headings = Theme.of(context).textTheme.bodyText1;
+    final TextStyle headings = Theme.of(context).textTheme.bodyText1!;
     return Container(
       padding: const EdgeInsets.all(20.0),
       child: Column(
@@ -65,7 +68,11 @@ class _StockSymbolView extends StatelessWidget {
 }
 
 class StockSymbolPage extends StatelessWidget {
-  const StockSymbolPage({ Key key, this.symbol, this.stocks }) : super(key: key);
+  const StockSymbolPage({
+    Key? key,
+    required this.symbol,
+    required this.stocks,
+  }) : super(key: key);
 
   final String symbol;
   final StockData stocks;
@@ -74,8 +81,8 @@ class StockSymbolPage extends StatelessWidget {
   Widget build(BuildContext context) {
     return AnimatedBuilder(
       animation: stocks,
-      builder: (BuildContext context, Widget child) {
-        final Stock stock = stocks[symbol];
+      builder: (BuildContext context, Widget? child) {
+        final Stock? stock = stocks[symbol];
         return Scaffold(
           appBar: AppBar(
             title: Text(stock?.name ?? symbol),
@@ -113,7 +120,10 @@ class StockSymbolPage extends StatelessWidget {
 }
 
 class StockSymbolBottomSheet extends StatelessWidget {
-  const StockSymbolBottomSheet({ Key key, this.stock }) : super(key: key);
+  const StockSymbolBottomSheet({
+    Key? key,
+    required this.stock,
+  }) : super(key: key);
 
   final Stock stock;
 

dev/benchmarks/test_apps/stocks/lib/stock_types.dart

@@ -2,23 +2,21 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/foundation.dart';
-
 enum StockMode { optimistic, pessimistic }
 enum BackupMode { enabled, disabled }
 
 class StockConfiguration {
   StockConfiguration({
-    @required this.stockMode,
-    @required this.backupMode,
-    @required this.debugShowGrid,
-    @required this.debugShowSizes,
-    @required this.debugShowBaselines,
-    @required this.debugShowLayers,
-    @required this.debugShowPointers,
-    @required this.debugShowRainbow,
-    @required this.showPerformanceOverlay,
-    @required this.showSemanticsDebugger,
+    required this.stockMode,
+    required this.backupMode,
+    required this.debugShowGrid,
+    required this.debugShowSizes,
+    required this.debugShowBaselines,
+    required this.debugShowLayers,
+    required this.debugShowPointers,
+    required this.debugShowRainbow,
+    required this.showPerformanceOverlay,
+    required this.showSemanticsDebugger,
   }) : assert(stockMode != null),
        assert(backupMode != null),
        assert(debugShowGrid != null),
@@ -42,16 +40,16 @@ class StockConfiguration {
   final bool showSemanticsDebugger;
 
   StockConfiguration copyWith({
-    StockMode stockMode,
-    BackupMode backupMode,
-    bool debugShowGrid,
-    bool debugShowSizes,
-    bool debugShowBaselines,
-    bool debugShowLayers,
-    bool debugShowPointers,
-    bool debugShowRainbow,
-    bool showPerformanceOverlay,
-    bool showSemanticsDebugger,
+    StockMode? stockMode,
+    BackupMode? backupMode,
+    bool? debugShowGrid,
+    bool? debugShowSizes,
+    bool? debugShowBaselines,
+    bool? debugShowLayers,
+    bool? debugShowPointers,
+    bool? debugShowRainbow,
+    bool? showPerformanceOverlay,
+    bool? showSemanticsDebugger,
   }) {
     return StockConfiguration(
       stockMode: stockMode ?? this.stockMode,

dev/benchmarks/test_apps/stocks/pubspec.yaml

 name: stocks
 
 environment:
-  sdk: ">=2.0.0-dev.68.0 <3.0.0"
+  sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
   flutter:

dev/benchmarks/test_apps/stocks/test/icon_color_test.dart

@@ -9,7 +9,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:stocks/main.dart' as stocks;
 import 'package:stocks/stock_data.dart' as stock_data;
 
-Element findElementOfExactWidgetTypeGoingDown(Element node, Type targetType) {
+Element? findElementOfExactWidgetTypeGoingDown(Element node, Type targetType) {
   void walker(Element child) {
     if (child.widget.runtimeType == targetType)
       throw child;
@@ -23,12 +23,14 @@ Element findElementOfExactWidgetTypeGoingDown(Element node, Type targetType) {
   return null;
 }
 
-Element findElementOfExactWidgetTypeGoingUp(Element node, Type targetType) {
-  Element result;
+Element? findElementOfExactWidgetTypeGoingUp(Element node, Type targetType) {
+  Element? result;
   bool walker(Element ancestor) {
-    if (ancestor.widget.runtimeType == targetType)
+    if (ancestor.widget.runtimeType == targetType) {
       result = ancestor;
-    return result == null;
+      return false;
+    }
+    return true;
   }
   node.visitAncestorElements(walker);
   return result;
@@ -37,11 +39,10 @@ Element findElementOfExactWidgetTypeGoingUp(Element node, Type targetType) {
 final RegExp materialIconAssetNameColorExtractor = RegExp(r'[^/]+/ic_.+_(white|black)_[0-9]+dp\.png');
 
 void checkIconColor(WidgetTester tester, String label, Color color) {
-  final Element listTile = findElementOfExactWidgetTypeGoingUp(tester.element(find.text(label)), ListTile);
-  expect(listTile, isNotNull);
-  final Element asset = findElementOfExactWidgetTypeGoingDown(listTile, RichText);
+  final Element listTile = findElementOfExactWidgetTypeGoingUp(tester.element(find.text(label)), ListTile)!;
+  final Element asset = findElementOfExactWidgetTypeGoingDown(listTile, RichText)!;
   final RichText richText = asset.widget as RichText;
-  expect(richText.text.style.color, equals(color));
+  expect(richText.text.style!.color, equals(color));
 }
 
 void main() {

dev/benchmarks/test_apps/stocks/test_driver/scroll_perf_test.dart

@@ -9,15 +9,14 @@ import 'package:test/test.dart' hide TypeMatcher, isInstanceOf;
 
 void main() {
   group('scrolling performance test', () {
-    FlutterDriver driver;
+    late FlutterDriver driver;
 
     setUpAll(() async {
       driver = await FlutterDriver.connect();
     });
 
     tearDownAll(() async {
-      if (driver != null)
-        driver.close();
+      driver.close();
     });
 
     test('measure', () async {

dev/benchmarks/test_apps/stocks/test_driver/stock_view_test.dart

@@ -9,16 +9,14 @@ import 'package:test/test.dart' hide TypeMatcher, isInstanceOf;
 
 void main() {
   group('basic stock view test', () {
-    FlutterDriver driver;
+    late FlutterDriver driver;
 
     setUpAll(() async {
       driver = await FlutterDriver.connect();
     });
 
     tearDownAll(() async {
-      if (driver != null) {
-        driver.close();
-      }
+      driver.close();
     });
 
     test('Stock list is shown', () async {