Update code style

2024-12-21 21:47:29 +01:00 · 2021-12-01 23:09:53 +01:00 · 2021-12-01 23:09:53 +01:00 · 8811cef864
commit 8811cef864
parent 9d8c7b8ebb
58 changed files with 955 additions and 700 deletions
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@ -0,0 +1,169 @@
+analyzer:
+  exclude:
+    - "lib/objectbox.g.dart"
+
+linter:
+  rules:
+    # these rules are documented on and in the same order as
+    # the Dart Lint rules page to make maintenance easier
+    # https://github.com/dart-lang/linter/blob/master/example/all.yaml
+    - always_declare_return_types
+    # - always_put_control_body_on_new_line # Allow return statements on same line as ifs
+    # - always_put_required_named_parameters_first # we prefer having parameters in the same order as fields https://github.com/flutter/flutter/issues/10219
+    - always_require_non_null_named_parameters
+    # - always_specify_types
+    # - always_use_package_imports # we do this commonly
+    - annotate_overrides
+    - avoid_bool_literals_in_conditional_expressions
+    - avoid_classes_with_only_static_members
+    - avoid_double_and_int_checks
+    - avoid_dynamic_calls
+    - avoid_empty_else
+    - avoid_equals_and_hash_code_on_mutable_classes
+    - avoid_escaping_inner_quotes
+    - avoid_field_initializers_in_const_classes
+    - avoid_function_literals_in_foreach_calls
+    - avoid_implementing_value_types
+    - avoid_init_to_null
+    - avoid_js_rounded_ints
+    - avoid_multiple_declarations_per_line
+    - avoid_null_checks_in_equality_operators
+    - avoid_positional_boolean_parameters
+    - avoid_print
+    # - avoid_private_typedef_functions # we prefer having typedef (discussion in https://github.com/flutter/flutter/pull/16356)
+    - avoid_redundant_argument_values
+    - avoid_relative_lib_imports
+    - avoid_renaming_method_parameters
+    - avoid_return_types_on_setters
+    - avoid_returning_null
+    - avoid_returning_null_for_future
+    - avoid_returning_null_for_void
+    - avoid_setters_without_getters
+    - avoid_shadowing_type_parameters
+    - avoid_single_cascade_in_expression_statements
+    - avoid_slow_async_io
+    - avoid_type_to_string
+    - avoid_types_as_parameter_names
+    - avoid_types_on_closure_parameters
+    - avoid_unnecessary_containers
+    - avoid_unused_constructor_parameters
+    - avoid_void_async
+    - await_only_futures
+    - camel_case_extensions
+    - camel_case_types
+    - cancel_subscriptions
+    - cast_nullable_to_non_nullable
+    - control_flow_in_finally
+    # - curly_braces_in_flow_control_structures
+    - depend_on_referenced_packages
+    - deprecated_consistency
+    - directives_ordering
+    - do_not_use_environment
+    - empty_catches
+    - empty_constructor_bodies
+    - empty_statements
+    - eol_at_end_of_file
+    - exhaustive_cases
+    - file_names
+    # - flutter_style_todos # This is mostly a single person project for the time being
+    - hash_and_equals
+    - implementation_imports
+    - iterable_contains_unrelated_type
+    - join_return_with_assignment
+    - leading_newlines_in_multiline_strings
+    - library_names
+    - library_prefixes
+    - library_private_types_in_public_api
+    # - lines_longer_than_80_chars
+    - list_remove_unrelated_type
+    - missing_whitespace_between_adjacent_strings
+    - no_adjacent_strings_in_list
+    - no_default_cases
+    - no_duplicate_case_values
+    - no_logic_in_create_state
+    # - non_constant_identifier_names # use API names for several variables
+    - noop_primitive_operations
+    - null_check_on_nullable_type_parameter
+    - null_closures
+    - only_throw_errors
+    - overridden_fields
+    - package_api_docs
+    - package_names
+    - package_prefixed_library_names
+    - prefer_adjacent_string_concatenation
+    - prefer_asserts_in_initializer_lists
+    - prefer_collection_literals
+    - prefer_conditional_assignment
+    - prefer_const_constructors
+    - prefer_const_constructors_in_immutables
+    - prefer_const_declarations
+    - prefer_const_literals_to_create_immutables
+    - prefer_contains
+    - prefer_equal_for_default_values
+    - prefer_final_fields
+    - prefer_final_in_for_each
+    - prefer_final_locals
+    # - prefer_final_parameters
+    - prefer_for_elements_to_map_fromIterable
+    - prefer_foreach
+    - prefer_function_declarations_over_variables
+    - prefer_generic_function_type_aliases
+    # - prefer_if_elements_to_conditional_expressions
+    - prefer_if_null_operators
+    - prefer_initializing_formals
+    - prefer_inlined_adds
+    - prefer_interpolation_to_compose_strings
+    - prefer_is_empty
+    - prefer_is_not_empty
+    - prefer_is_not_operator
+    - prefer_iterable_whereType
+    - prefer_null_aware_operators
+    - prefer_relative_imports
+    - prefer_single_quotes
+    - prefer_spread_collections
+    - prefer_typing_uninitialized_variables
+    - prefer_void_to_null
+    - provide_deprecation_message
+    - recursive_getters
+    - require_trailing_commas
+    - sized_box_for_whitespace
+    - slash_for_doc_comments
+    - sort_child_properties_last
+    # - sort_constructors_first
+    - sort_unnamed_constructors_first
+    - test_types_in_equals
+    - throw_in_finally
+    - tighten_type_of_initializing_formals
+    - type_init_formals
+    - unnecessary_await_in_return
+    - unnecessary_brace_in_string_interps
+    - unnecessary_const
+    - unnecessary_constructor_name
+    - unnecessary_getters_setters
+    - unnecessary_new
+    - unnecessary_null_aware_assignments
+    - unnecessary_null_checks
+    - unnecessary_null_in_if_null_operators
+    - unnecessary_nullable_for_final_variable_declarations
+    - unnecessary_overrides
+    - unnecessary_parenthesis
+    - unnecessary_statements
+    - unnecessary_string_escapes
+    - unnecessary_string_interpolations
+    - unnecessary_this
+    - unrelated_type_equality_checks
+    - unsafe_html
+    - use_build_context_synchronously
+    - use_full_hex_values_for_flutter_colors
+    - use_function_type_syntax_for_parameters
+    - use_is_even_rather_than_modulo
+    - use_key_in_widget_constructors
+    - use_late_for_private_fields_and_variables
+    - use_named_constants
+    - use_raw_strings
+    - use_rethrow_when_possible
+    - use_setters_to_change_properties
+    - use_test_throws_matchers
+    - valid_regexps
+    - void_checks
+    
--- a/lib/bloc/database/database_bloc.dart
+++ b/lib/bloc/database/database_bloc.dart
@ -1,5 +1,5 @@

-import 'package:bloc/bloc.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';

 import './database_event.dart';
 import './database_state.dart';
@ -7,12 +7,12 @@ import './database_state.dart';
 export 'package:flutter_bloc/flutter_bloc.dart';

 export './database_event.dart';
-export './database_state.dart';
 export './database_not_connected_exception.dart';
+export './database_state.dart';

 class DatabaseBloc extends Bloc<DatabaseEvent, DatabaseState> {

-  DatabaseBloc() : super(DatabaseDisconnected());
+  DatabaseBloc() : super(const DatabaseDisconnected());

  @override
  Stream<DatabaseState> mapEventToState(DatabaseEvent event)
@ -20,7 +20,7 @@ class DatabaseBloc extends Bloc<DatabaseEvent, DatabaseState> {
    if (event is ConnectedToDatabase) {
      yield DatabaseConnected(event.database);
    } else {
-      yield DatabaseDisconnected();
+      yield const DatabaseDisconnected();
    }
  }

--- a/lib/bloc/database/database_state.dart
+++ b/lib/bloc/database/database_state.dart
@ -1,4 +1,3 @@
-
 import 'package:objectbox/objectbox.dart';

 abstract class DatabaseState {
--- a/lib/bloc/theme/theme_bloc.dart
+++ b/lib/bloc/theme/theme_bloc.dart
@ -1,10 +1,11 @@
 import 'dart:async';

-import 'package:bloc/bloc.dart';
-import 'package:jisho_study_tool/models/themes/theme.dart';
-import 'package:meta/meta.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:shared_preferences/shared_preferences.dart';

+import '../../models/themes/theme.dart';
+
 export 'package:flutter_bloc/flutter_bloc.dart';
 export 'package:jisho_study_tool/models/themes/theme.dart';

@ -14,10 +15,10 @@ part 'theme_state.dart';
 class ThemeBloc extends Bloc<ThemeEvent, ThemeState> {
  bool prefsAreLoaded = false;

-  ThemeBloc() : super(LightThemeState()) {
+  ThemeBloc() : super(const LightThemeState()) {
    SharedPreferences.getInstance().then((prefs) {
-      this.prefsAreLoaded = true;
-      this.add(
+      prefsAreLoaded = true;
+      add(
        SetTheme(
          themeIsDark: prefs.getBool('darkThemeEnabled') ?? false,
        ),
--- a/lib/bloc/theme/theme_state.dart
+++ b/lib/bloc/theme/theme_state.dart
@ -14,6 +14,7 @@ class LightThemeState extends ThemeState {

  const LightThemeState({this.prefsAreLoaded = false}) : super(prefsAreLoaded);

+  @override
  AppTheme get theme => LightTheme();
 }

@ -22,5 +23,6 @@ class DarkThemeState extends ThemeState {

  const DarkThemeState({this.prefsAreLoaded = false}) : super(prefsAreLoaded);

+  @override
  AppTheme get theme => DarkTheme();
 }
--- a/lib/main.dart
+++ b/lib/main.dart
@ -1,27 +1,26 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/bloc/theme/theme_bloc.dart';
-import 'package:jisho_study_tool/router.dart';
-import 'package:jisho_study_tool/view/components/common/splash.dart';
 import 'package:mdi/mdi.dart';
-import 'package:path_provider/path_provider.dart';
 import 'package:path/path.dart';
+import 'package:path_provider/path_provider.dart';

-import 'package:jisho_study_tool/objectbox.g.dart';
-
-import 'package:jisho_study_tool/bloc/database/database_bloc.dart';
-
-import 'package:jisho_study_tool/view/screens/search/kanji_view.dart';
-import 'package:jisho_study_tool/view/screens/history.dart';
-import 'package:jisho_study_tool/view/screens/search/search_view.dart';
-import 'package:jisho_study_tool/view/screens/settings.dart';
-
+import 'bloc/database/database_bloc.dart';
+import 'bloc/theme/theme_bloc.dart';
 import 'models/themes/theme.dart';
+import 'objectbox.g.dart';
+import 'router.dart';
+import 'view/components/common/splash.dart';
+import 'view/screens/history.dart';
+import 'view/screens/search/kanji_view.dart';
+import 'view/screens/search/search_view.dart';
+import 'view/screens/settings.dart';

-void main() => runApp(MyApp());
+void main() => runApp(const MyApp());

 DatabaseBloc _databaseBloc = DatabaseBloc();

 class MyApp extends StatefulWidget {
+  const MyApp({Key? key}) : super(key: key);
+
  @override
  _MyAppState createState() => _MyAppState();
 }
@ -50,7 +49,7 @@ class _MyAppState extends State<MyApp> {
  @override
  void dispose() {
    _store.close();
-    _databaseBloc.add(DisconnectedFromDatabase());
+    _databaseBloc.add(const DisconnectedFromDatabase());
    super.dispose();
  }

@ -64,13 +63,13 @@ class _MyAppState extends State<MyApp> {
      child: BlocBuilder<ThemeBloc, ThemeState>(
        builder: (context, themeState) {
          if (!(dbConnected && themeState.prefsAreLoaded))
-            return SplashScreen();
+            return const SplashScreen();

          return MaterialApp(
            title: 'Jisho Study Tool',
            theme: themeState.theme.getMaterialTheme(),
            initialRoute: '/',
-            onGenerateRoute: PageRouter.generateRoute,
+            onGenerateRoute: generateRoute,
          );
        },
      ),
@ -79,6 +78,8 @@ class _MyAppState extends State<MyApp> {
 }

 class Home extends StatefulWidget {
+  const Home({Key? key}) : super(key: key);
+
  @override
  State<StatefulWidget> createState() => _HomeState();
 }
@ -100,11 +101,12 @@ class _HomeState extends State<Home> {
          body: Stack(
            children: [
              Positioned(
-                child: Image.asset(
-                    'assets/images/denshi_jisho_background_overlay.png'),
                right: 30,
                left: 100,
                bottom: 30,
+                child: Image.asset(
+                  'assets/images/denshi_jisho_background_overlay.png',
+                ),
              ),
              pages[pageNum].content,
            ],
@ -112,8 +114,8 @@ class _HomeState extends State<Home> {
          bottomNavigationBar: BottomNavigationBar(
            fixedColor: AppTheme.jishoGreen.background,
            currentIndex: pageNum,
-            onTap: (int index) => setState(() {
-              this.pageNum = index;
+            onTap: (index) => setState(() {
+              pageNum = index;
            }),
            items: pages.map((p) => p.item).toList(),
            showSelectedLabels: false,
@ -139,7 +141,7 @@ class _Page {
 }

 final List<_Page> pages = [
-  _Page(
+  const _Page(
    content: SearchView(),
    titleBar: Text('Search'),
    item: BottomNavigationBarItem(
@ -147,15 +149,17 @@ final List<_Page> pages = [
      icon: Icon(Icons.search),
    ),
  ),
-  _Page(
+  const _Page(
    content: KanjiView(),
    titleBar: Text('Kanji'),
    item: BottomNavigationBarItem(
-        label: 'Kanji', icon: Icon(Mdi.ideogramCjk, size: 30)),
+      label: 'Kanji',
+      icon: Icon(Mdi.ideogramCjk, size: 30),
    ),
-  _Page(
+  ),
+  const _Page(
    content: HistoryView(),
-    titleBar: Text("History"),
+    titleBar: Text('History'),
    item: BottomNavigationBarItem(
      label: 'History',
      icon: Icon(Icons.history),
@ -163,15 +167,15 @@ final List<_Page> pages = [
  ),
  _Page(
    content: Container(),
-    titleBar: Text("Saved"),
-    item: BottomNavigationBarItem(
+    titleBar: const Text('Saved'),
+    item: const BottomNavigationBarItem(
      label: 'Saved',
      icon: Icon(Icons.bookmark),
    ),
  ),
-  _Page(
+  const _Page(
    content: SettingsView(),
-    titleBar: Text("Settings"),
+    titleBar: Text('Settings'),
    item: BottomNavigationBarItem(
      label: 'Settings',
      icon: Icon(Icons.settings),
--- a/lib/models/history/search.dart
+++ b/lib/models/history/search.dart
@ -16,15 +16,15 @@ class Search {

  Search({
    this.id = 0,
-    required this.timestamp
-  }); // {
+    required this.timestamp,
+  });

  bool isKanji() {  
  //   // TODO: better error message
-    if (this.wordQuery.target == null && this.kanjiQuery.target == null)
+    if (wordQuery.target == null && kanjiQuery.target == null)
      throw Exception();
    
-    return this.wordQuery.target == null;
+    return wordQuery.target == null;
  }

 }
--- a/lib/models/history/word_result.dart
+++ b/lib/models/history/word_result.dart
@ -1,6 +1,6 @@
 import 'package:objectbox/objectbox.dart';

-import 'package:jisho_study_tool/models/history/word_query.dart';
+import 'word_query.dart';

@Entity()
 class WordResult {
--- a/lib/models/themes/dark.dart
+++ b/lib/models/themes/dark.dart
@ -1,34 +1,42 @@
 part of './theme.dart';

 class DarkTheme extends AppTheme {
+  @override
  ColorSet get kanjiResultColor => const ColorSet(
        foreground: Colors.white,
        background: Colors.green,
      );

+  @override
  ColorSet get onyomiColor => const ColorSet(
        foreground: Colors.white,
        background: Colors.orange,
      );

+  @override
  ColorSet get kunyomiColor => const ColorSet(
        foreground: Colors.white,
        background: Colors.lightBlue,
      );

+  @override
  Color get foreground => Colors.black;
+  @override
  Color get background => Colors.white;

+  @override
  ColorSet get menuGreyLight => ColorSet(
        foreground: Colors.white,
        background: Colors.grey.shade700,
      );

-  ColorSet get menuGreyNormal => ColorSet(
+  @override
+  ColorSet get menuGreyNormal => const ColorSet(
        foreground: Colors.white,
        background: Colors.grey,
      );

+  @override
  ColorSet get menuGreyDark => ColorSet(
        foreground: Colors.black,
        background: Colors.grey.shade300,
--- a/lib/models/themes/light.dart
+++ b/lib/models/themes/light.dart
@ -1,33 +1,41 @@
 part of './theme.dart';

 class LightTheme extends AppTheme {
+  @override
  ColorSet get kanjiResultColor => const ColorSet(
        foreground: Colors.white,
        background: Colors.blue,
      );

+  @override
  ColorSet get onyomiColor => const ColorSet(
        foreground: Colors.white,
        background: Colors.orange,
      );

+  @override
  ColorSet get kunyomiColor => const ColorSet(
        foreground: Colors.white,
        background: Colors.lightBlue,
      );

+  @override
  Color get foreground => Colors.black;
+  @override
  Color get background => Colors.white;

+  @override
  ColorSet get menuGreyLight => ColorSet(
        foreground: Colors.black,
        background: Colors.grey.shade300,
      );
-  ColorSet get menuGreyNormal => ColorSet(
+  @override
+  ColorSet get menuGreyNormal => const ColorSet(
        foreground: Colors.white,
        background: Colors.grey,
      );

+  @override
  ColorSet get menuGreyDark => ColorSet(
        foreground: Colors.white,
        background: Colors.grey.shade700,
--- a/lib/models/themes/theme.dart
+++ b/lib/models/themes/theme.dart
@ -4,7 +4,6 @@ part 'light.dart';
 part 'dark.dart';

 abstract class AppTheme {
-
  static const ColorSet jishoGreen = ColorSet(
    foreground: Colors.white,
    background: Color(0xFF3EDD00),
@ -49,14 +48,15 @@ class ColorSet {

 /// Source: https://blog.usejournal.com/creating-a-custom-color-swatch-in-flutter-554bcdcb27f3
 MaterialColor createMaterialColor(Color color) {
-  List strengths = <double>[.05];
+  final List<double> strengths = [.05];
  final swatch = <int, Color>{};
  final int r = color.red, g = color.green, b = color.blue;

  for (int i = 1; i < 10; i++) {
    strengths.add(0.1 * i);
  }
-  strengths.forEach((strength) {
+
+  for (final strength in strengths) {
    final double ds = 0.5 - strength;
    swatch[(strength * 1000).round()] = Color.fromRGBO(
      r + ((ds < 0 ? r : (255 - r)) * ds).round(),
@ -64,6 +64,6 @@ MaterialColor createMaterialColor(Color color) {
      b + ((ds < 0 ? b : (255 - b)) * ds).round(),
      1,
    );
-  });
+  }
  return MaterialColor(color.value, swatch);
 }
--- a/lib/router.dart
+++ b/lib/router.dart
@ -1,27 +1,31 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/view/screens/search/kanji_result_page.dart';
-import 'package:jisho_study_tool/view/screens/search/search_results_page.dart';

 import 'main.dart';
+import 'view/screens/search/kanji_result_page.dart';
+import 'view/screens/search/search_results_page.dart';

-class PageRouter {
-  static Route<dynamic> generateRoute(RouteSettings settings) {
+Route<dynamic> generateRoute(RouteSettings settings) {
  final args = settings.arguments;

  switch (settings.name) {
    case '/':
-        return MaterialPageRoute(builder: (_) => Home());
+      return MaterialPageRoute(builder: (_) => const Home());

    case '/search':
      final searchTerm = args as String;
-        return MaterialPageRoute(builder: (_) => SearchResultsPage(searchTerm: searchTerm));
+      return MaterialPageRoute(
+        builder: (_) => SearchResultsPage(searchTerm: searchTerm),
+      );

    case '/kanjiSearch':
      final searchTerm = args as String;
-        return MaterialPageRoute(builder: (_) => KanjiResultPage(kanjiSearchTerm: searchTerm));
+      return MaterialPageRoute(
+        builder: (_) => KanjiResultPage(kanjiSearchTerm: searchTerm),
+      );

    default:
-        return MaterialPageRoute(builder: (_) => Text("ERROR: this route does not exist"));
-    }
+      return MaterialPageRoute(
+        builder: (_) => const Text('ERROR: this route does not exist'),
+      );
  }
 }
--- a/lib/services/jisho_api/jisho_search.dart
+++ b/lib/services/jisho_api/jisho_search.dart
@ -2,5 +2,5 @@ import 'package:unofficial_jisho_api/api.dart' as jisho;
 export 'package:unofficial_jisho_api/api.dart' show JishoAPIResult; 

 Future<jisho.JishoAPIResult> fetchJishoResults(searchTerm) async {
-  return await jisho.searchForPhrase(searchTerm);
+  return jisho.searchForPhrase(searchTerm);
 }
--- a/lib/services/jisho_api/kanji_search.dart
+++ b/lib/services/jisho_api/kanji_search.dart
@ -1,18 +1,19 @@
+import 'package:flutter/material.dart';
 import 'package:unofficial_jisho_api/api.dart' as jisho;
 export 'package:unofficial_jisho_api/api.dart' show KanjiResult;

 String? _convertGrade(String grade) {
  const conversionTable = {
-    "grade 1": "小1",
-    "grade 2": "小2",
-    "grade 3": "小3",
-    "grade 4": "小4",
-    "grade 5": "小5",
-    "grade 6": "小6",
-    "junior high": "中"
+    'grade 1': '小1',
+    'grade 2': '小2',
+    'grade 3': '小3',
+    'grade 4': '小4',
+    'grade 5': '小5',
+    'grade 6': '小6',
+    'junior high': '中'
  };

-  print('conversion run: $grade -> ${conversionTable[grade]}');
+  debugPrint('conversion run: $grade -> ${conversionTable[grade]}');

  return conversionTable[grade];
 }
--- a/lib/view/components/common/loading.dart
+++ b/lib/view/components/common/loading.dart
@ -1,12 +1,12 @@
 import 'package:flutter/material.dart';

 class LoadingScreen extends StatelessWidget {
+  const LoadingScreen({Key? key}) : super(key: key);
+
  @override
  Widget build(BuildContext context) {
-    return Container(
-      child: Center(
+    return const Center(
      child: CircularProgressIndicator(),
-      ),
    );
  }
 }
--- a/lib/view/components/common/splash.dart
+++ b/lib/view/components/common/splash.dart
@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/models/themes/theme.dart';
+
+import '../../../models/themes/theme.dart';

 class SplashScreen extends StatelessWidget {
  const SplashScreen({Key? key}) : super(key: key);
@ -8,8 +9,10 @@ class SplashScreen extends StatelessWidget {
  Widget build(BuildContext context) {
    return Container(
      decoration: BoxDecoration(color: AppTheme.jishoGreen.background),
-      child: Center(
-        child: Image(image: AssetImage('assets/images/logo/logo_icon_transparent.png'),)
+      child: const Center(
+        child: Image(
+          image: AssetImage('assets/images/logo/logo_icon_transparent.png'),
+        ),
      ),
    );
  }
--- a/lib/view/components/history/date_divider.dart
+++ b/lib/view/components/history/date_divider.dart
@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/bloc/theme/theme_bloc.dart';
-import 'package:jisho_study_tool/models/themes/theme.dart';
+
+import '../../../bloc/theme/theme_bloc.dart';
+import '../../../models/themes/theme.dart';

 class DateDivider extends StatelessWidget {
  final String? text;
@ -33,31 +34,31 @@ class DateDivider extends StatelessWidget {
    final int day = date.day;
    final String month = monthTable[date.month]!;
    final int year = date.year;
-    return "$day. $month $year";
+    return '$day. $month $year';
  }

  @override
  Widget build(BuildContext context) {
-    final Widget header = (this.text != null)
-        ? Text(this.text!)
-        : (this.date != null)
-            ? Text(getHumanReadableDate(this.date!))
-            : SizedBox.shrink();
+    final Widget header = (text != null)
+        ? Text(text!)
+        : (date != null)
+            ? Text(getHumanReadableDate(date!))
+            : const SizedBox.shrink();

    final ColorSet _menuColors =
        BlocProvider.of<ThemeBloc>(context).state.theme.menuGreyNormal;

    return Container(
+      decoration: BoxDecoration(color: _menuColors.background),
+      padding: const EdgeInsets.symmetric(
+        vertical: 5,
+        horizontal: 10,
+      ),
+      margin: margin,
      child: DefaultTextStyle.merge(
        child: header,
        style: TextStyle(color: _menuColors.foreground),
      ),
-      decoration: BoxDecoration(color: _menuColors.background),
-      padding: EdgeInsets.symmetric(
-        vertical: 5,
-        horizontal: 10,
-      ),
-      margin: this.margin,
    );
  }
 }
--- a/lib/view/components/history/kanji_search_item.dart
+++ b/lib/view/components/history/kanji_search_item.dart
@ -1,10 +1,10 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_slidable/flutter_slidable.dart';
-import 'package:jisho_study_tool/bloc/theme/theme_bloc.dart';
-import 'package:jisho_study_tool/models/history/kanji_query.dart';
-import 'package:jisho_study_tool/models/themes/theme.dart';

 import './search_item.dart';
+import '../../../bloc/theme/theme_bloc.dart';
+import '../../../models/history/kanji_query.dart';
+import '../../../models/themes/theme.dart';

 class _KanjiBox extends StatelessWidget {
  final String kanji;
@ -19,7 +19,7 @@ class _KanjiBox extends StatelessWidget {
      child: AspectRatio(
        aspectRatio: 1,
        child: Container(
-          padding: EdgeInsets.all(5),
+          padding: const EdgeInsets.all(5),
          decoration: BoxDecoration(
            color: _menuColors.background,
            borderRadius: BorderRadius.circular(10.0),
--- a/lib/view/components/history/phrase_search_item.dart
+++ b/lib/view/components/history/phrase_search_item.dart
@ -1,8 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_slidable/flutter_slidable.dart';
-import 'package:jisho_study_tool/models/history/word_query.dart';

 import './search_item.dart';
+import '../../../models/history/word_query.dart';

 class PhraseSearchItem extends StatelessWidget {
  final WordQuery search;
@ -17,15 +17,20 @@ class PhraseSearchItem extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Slidable(
-      actionPane: SlidableScrollActionPane(),
-      secondaryActions: [
+      actionPane: const SlidableScrollActionPane(),
+      secondaryActions: const [
        IconSlideAction(
-            caption: "Delete", color: Colors.red, icon: Icons.delete)
+          caption: 'Delete',
+          color: Colors.red,
+          icon: Icons.delete,
+        ),
      ],
      child: SearchItem(
-        onTap: () {
-          Navigator.pushNamed(context, '/search', arguments: this.search.query);
-        },
+        onTap: () => Navigator.pushNamed(
+          context,
+          '/search',
+          arguments: search.query,
+        ),
        time: timestamp,
        search: Text(search.query),
      ),
--- a/lib/view/components/history/search_item.dart
+++ b/lib/view/components/history/search_item.dart
@ -13,27 +13,25 @@ class SearchItem extends StatelessWidget {
  }) : super(key: key);

  String getTime() {
-    final hours = this.time.hour.toString().padLeft(2, '0');
-    final mins = this.time.minute.toString().padLeft(2, '0');
-    return "$hours:$mins";
+    final hours = time.hour.toString().padLeft(2, '0');
+    final mins = time.minute.toString().padLeft(2, '0');
+    return '$hours:$mins';
  }

  @override
  Widget build(BuildContext context) {
-    return Container(
-      child: ListTile(
+    return ListTile(
      onTap: onTap,
      contentPadding: EdgeInsets.zero,
      title: Row(
        children: [
          Padding(
-              padding: EdgeInsets.symmetric(horizontal: 20),
+            padding: const EdgeInsets.symmetric(horizontal: 20),
            child: Text(getTime()),
          ),
          search,
        ],
      ),
-      ),
    );
  }
 }
--- a/lib/view/components/kanji/kanji_result_body.dart
+++ b/lib/view/components/kanji/kanji_result_body.dart
@ -14,13 +14,12 @@ class KanjiResultBody extends StatelessWidget {
  late final String query;
  late final jisho.KanjiResultData resultData;

-  KanjiResultBody({required jisho.KanjiResult result}) {
-
+  KanjiResultBody({required jisho.KanjiResult result, Key? key})
+      : super(key: key) {
    query = result.query;

    // TODO: Handle this kind of exception before widget is initialized
-    if (result.data == null)
-      throw Exception();
+    if (result.data == null) throw Exception();

    resultData = result.data!;
  }
@ -30,68 +29,72 @@ class KanjiResultBody extends StatelessWidget {
    return ListView(
      children: [
        Container(
-          margin: EdgeInsets.fromLTRB(20.0, 20.0, 20.0, 30.0),
+          margin: const EdgeInsets.fromLTRB(20.0, 20.0, 20.0, 30.0),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
            children: [
-              Flexible(
-                flex: 1,
+              const Flexible(
                fit: FlexFit.tight,
                child: Center(child: SizedBox()),
              ),
              Flexible(
-                flex: 1,
                fit: FlexFit.tight,
-                child: Center(child: Header(query)),
+                child: Center(child: Header(kanji: query)),
              ),
              Flexible(
-                flex: 1,
                fit: FlexFit.tight,
                child: Center(
-                  child: (resultData.radical != null) ? Radical(resultData.radical!) : SizedBox(),
+                  child: (resultData.radical != null)
+                      ? Radical(radical: resultData.radical!)
+                      : const SizedBox(),
                ),
              ),
            ],
          ),
        ),
-        YomiChips(resultData.meaning.split(', '), YomiType.meaning),
-        resultData.onyomi.length != 0 ? YomiChips(resultData.onyomi, YomiType.onyomi) : SizedBox.shrink(),
-        resultData.kunyomi.length != 0 ? YomiChips(resultData.kunyomi, YomiType.kunyomi) : SizedBox.shrink(),
+        YomiChips(yomi: resultData.meaning.split(', '), type: YomiType.meaning),
+        (resultData.onyomi.isNotEmpty)
+            ? YomiChips(yomi: resultData.onyomi, type: YomiType.onyomi)
+            : const SizedBox.shrink(),
+        (resultData.kunyomi.isNotEmpty)
+            ? YomiChips(yomi: resultData.kunyomi, type: YomiType.kunyomi)
+            : const SizedBox.shrink(),
        IntrinsicHeight(
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
            children: [
-              StrokeOrderGif(resultData.strokeOrderGifUri),
-              Container(
-                child: Column(
+              StrokeOrderGif(uri: resultData.strokeOrderGifUri),
+              Column(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Row(
                    children: [
-                        Text("JLPT: ", style: TextStyle(fontSize: 20.0)),
-                        JlptLevel(resultData.jlptLevel ?? "⨉"),
+                      const Text('JLPT: ', style: TextStyle(fontSize: 20.0)),
+                      JlptLevel(jlptLevel: resultData.jlptLevel ?? '⨉'),
                    ],
                  ),
                  Row(
                    children: [
-                        Text("Grade: ", style: TextStyle(fontSize: 20.0)),
-                        Grade(resultData.taughtIn ?? "⨉"),
+                      const Text('Grade: ', style: TextStyle(fontSize: 20.0)),
+                      Grade(grade: resultData.taughtIn ?? '⨉'),
                    ],
                  ),
                  Row(
                    children: [
-                        Text("Rank: ", style: TextStyle(fontSize: 20.0)),
-                        Rank(resultData.newspaperFrequencyRank ?? -1),
+                      const Text('Rank: ', style: TextStyle(fontSize: 20.0)),
+                      Rank(rank: resultData.newspaperFrequencyRank ?? -1),
+                    ],
+                  ),
                ],
              ),
            ],
          ),
        ),
-            ],
+        Examples(
+          onyomi: resultData.onyomiExamples,
+          kunyomi: resultData.kunyomiExamples,
        ),
-        ),
-        Examples(resultData.onyomiExamples, resultData.kunyomiExamples),
      ],
    );
  }
--- a/lib/view/components/kanji/kanji_result_body/examples.dart
+++ b/lib/view/components/kanji/kanji_result_body/examples.dart
@ -1,15 +1,17 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/bloc/theme/theme_bloc.dart';
 import 'package:unofficial_jisho_api/api.dart';

-class Examples extends StatelessWidget {
-  final List<YomiExample> onyomiExamples;
-  final List<YomiExample> kunyomiExamples;
+import '../../../../bloc/theme/theme_bloc.dart';

-  const Examples(
-    this.onyomiExamples,
-    this.kunyomiExamples,
-  );
+class Examples extends StatelessWidget {
+  final List<YomiExample> onyomi;
+  final List<YomiExample> kunyomi;
+
+  const Examples({
+    required this.onyomi,
+    required this.kunyomi,
+    Key? key,
+  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
@ -17,20 +19,21 @@ class Examples extends StatelessWidget {
      children: [
        [
          Container(
-            margin: EdgeInsets.symmetric(horizontal: 10),
+            margin: const EdgeInsets.symmetric(horizontal: 10),
            alignment: Alignment.centerLeft,
-            child: Text(
+            child: const Text(
              'Examples:',
              style: TextStyle(fontSize: 20),
            ),
          )
        ],
-        onyomiExamples
+        onyomi
            .map((onyomiExample) => _Example(onyomiExample, _KanaType.onyomi))
            .toList(),
-        kunyomiExamples
+        kunyomi
            .map(
-                (kunyomiExample) => _Example(kunyomiExample, _KanaType.kunyomi))
+              (kunyomiExample) => _Example(kunyomiExample, _KanaType.kunyomi),
+            )
            .toList(),
      ].expand((list) => list).toList(),
    );
@ -48,69 +51,67 @@ class _Example extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final _themeData = BlocProvider.of<ThemeBloc>(context).state.theme;
-    final _kanaColors = kanaType == _KanaType.kunyomi ? _themeData.kunyomiColor : _themeData.onyomiColor;
+    final _kanaColors = kanaType == _KanaType.kunyomi
+        ? _themeData.kunyomiColor
+        : _themeData.onyomiColor;
    final _menuColors = _themeData.menuGreyNormal;

    return Container(
-      margin: EdgeInsets.symmetric(
+      margin: const EdgeInsets.symmetric(
        vertical: 5.0,
        horizontal: 10.0,
      ),
      decoration: BoxDecoration(
-          color: _menuColors.background, borderRadius: BorderRadius.circular(10.0)),
+        color: _menuColors.background,
+        borderRadius: BorderRadius.circular(10.0),
+      ),
      child: Row(
        children: [
          Container(
-            padding: EdgeInsets.symmetric(
+            padding: const EdgeInsets.symmetric(
              vertical: 10.0,
              horizontal: 10.0,
            ),
            decoration: BoxDecoration(
              color: _kanaColors.background,
-              borderRadius: BorderRadius.only(
+              borderRadius: const BorderRadius.only(
                topLeft: Radius.circular(10.0),
                bottomLeft: Radius.circular(10.0),
              ),
            ),
            child: Column(
              children: [
-                Container(
-                  child: Text(
+                Text(
                  yomiExample.reading,
                  style: TextStyle(
                    color: _kanaColors.foreground,
                    fontSize: 15.0,
                  ),
                ),
-                ),
-                SizedBox(
+                const SizedBox(
                  height: 5.0,
                ),
-                Container(
-                  child: Text(
+                Text(
                  yomiExample.example,
                  style: TextStyle(
                    color: _kanaColors.foreground,
                    fontSize: 20.0,
                  ),
                ),
-                ),
              ],
            ),
          ),
-          SizedBox(
+          const SizedBox(
            width: 15.0,
          ),
          Expanded(
            child: Wrap(
              children: [
-                Container(
-                  child: Text(
+                Text(
                  yomiExample.meaning,
                  style: TextStyle(
                    color: _menuColors.foreground,
                  ),
-                  ),
                )
              ],
            ),
--- a/lib/view/components/kanji/kanji_result_body/grade.dart
+++ b/lib/view/components/kanji/kanji_result_body/grade.dart
@ -1,17 +1,22 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/bloc/theme/theme_bloc.dart';
+
+import '../../../../bloc/theme/theme_bloc.dart';

 class Grade extends StatelessWidget {
  final String grade;

-  const Grade(this.grade);
+  const Grade({required this.grade, Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final _kanjiColors = BlocProvider.of<ThemeBloc>(context).state.theme.kanjiResultColor;

    return Container(
-      padding: EdgeInsets.all(10.0),
+      padding: const EdgeInsets.all(10.0),
+      decoration: BoxDecoration(
+        color: _kanjiColors.background,
+        shape: BoxShape.circle,
+      ),
      child: Text(
        grade,
        style: TextStyle(
@ -19,10 +24,6 @@ class Grade extends StatelessWidget {
          fontSize: 20.0,
        ),
      ),
-      decoration: BoxDecoration(
-        color: _kanjiColors.background,
-        shape: BoxShape.circle,
-      ),
    );
  }
 }
--- a/lib/view/components/kanji/kanji_result_body/header.dart
+++ b/lib/view/components/kanji/kanji_result_body/header.dart
@ -1,14 +1,19 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/bloc/theme/theme_bloc.dart';
+
+import '../../../../bloc/theme/theme_bloc.dart';

 class Header extends StatelessWidget {
  final String kanji;

-  const Header(this.kanji);
+  const Header({
+    required this.kanji,
+    Key? key,
+  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
-    final _kanjiColors = BlocProvider.of<ThemeBloc>(context).state.theme.kanjiResultColor;
+    final _kanjiColors =
+        BlocProvider.of<ThemeBloc>(context).state.theme.kanjiResultColor;

    return AspectRatio(
      aspectRatio: 1,
--- a/lib/view/components/kanji/kanji_result_body/jlpt_level.dart
+++ b/lib/view/components/kanji/kanji_result_body/jlpt_level.dart
@ -1,18 +1,26 @@
-
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/bloc/theme/theme_bloc.dart';
+
+import '../../../../bloc/theme/theme_bloc.dart';

 class JlptLevel extends StatelessWidget {
  final String jlptLevel;

-  const JlptLevel(this.jlptLevel);
+  const JlptLevel({
+    required this.jlptLevel,
+    Key? key,
+  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
-    final _kanjiColors = BlocProvider.of<ThemeBloc>(context).state.theme.kanjiResultColor;
+    final _kanjiColors =
+        BlocProvider.of<ThemeBloc>(context).state.theme.kanjiResultColor;

    return Container(
-      padding: EdgeInsets.all(10.0),
+      padding: const EdgeInsets.all(10.0),
+      decoration: BoxDecoration(
+        shape: BoxShape.circle,
+        color: _kanjiColors.background,
+      ),
      child: Text(
        jlptLevel,
        style: TextStyle(
@ -20,10 +28,6 @@ class JlptLevel extends StatelessWidget {
          fontSize: 20.0,
        ),
      ),
-      decoration: BoxDecoration(
-        shape: BoxShape.circle,
-        color: _kanjiColors.background,
-      ),
    );
  }
 }
--- a/lib/view/components/kanji/kanji_result_body/radical.dart
+++ b/lib/view/components/kanji/kanji_result_body/radical.dart
@ -1,18 +1,24 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/bloc/theme/theme_bloc.dart';
 import 'package:unofficial_jisho_api/api.dart' as jisho;

+import '../../../../bloc/theme/theme_bloc.dart';
+
 class Radical extends StatelessWidget {
  final jisho.Radical radical;

-  const Radical(this.radical);
+  const Radical({required this.radical, Key? key,}) : super(key: key);
+

  @override
  Widget build(BuildContext context) {
    final _kanjiColors = BlocProvider.of<ThemeBloc>(context).state.theme.kanjiResultColor;

    return Container(
-      padding: EdgeInsets.all(10.0),
+      padding: const EdgeInsets.all(10.0),
+      decoration: BoxDecoration(
+        shape: BoxShape.circle,
+        color: _kanjiColors.background,
+      ),
      child: Text(
        radical.symbol,
        style: TextStyle(
@ -20,10 +26,6 @@ class Radical extends StatelessWidget {
          fontSize: 40.0,
        ),
      ),
-      decoration: BoxDecoration(
-        shape: BoxShape.circle,
-        color: _kanjiColors.background,
-      ),
    );
  }
 }
--- a/lib/view/components/kanji/kanji_result_body/rank.dart
+++ b/lib/view/components/kanji/kanji_result_body/rank.dart
@ -1,18 +1,23 @@
-
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/bloc/theme/theme_bloc.dart';
+
+import '../../../../bloc/theme/theme_bloc.dart';

 class Rank extends StatelessWidget {
  final int rank;

-  const Rank(this.rank);
+  const Rank({required this.rank, Key? key,}) : super(key: key);
+

  @override
  Widget build(BuildContext context) {
    final _kanjiColors = BlocProvider.of<ThemeBloc>(context).state.theme.kanjiResultColor;

    return Container(
-      padding: EdgeInsets.all(10.0),
+      padding: const EdgeInsets.all(10.0),
+      decoration: BoxDecoration(
+        borderRadius: BorderRadius.circular(10.0),
+        color: _kanjiColors.background,
+      ),
      child: Text(
        '${rank.toString()} / 2500',
        style: TextStyle(
@ -20,10 +25,6 @@ class Rank extends StatelessWidget {
          fontSize: 20.0,
        ),
      ),
-      decoration: BoxDecoration(
-        borderRadius: BorderRadius.circular(10.0),
-        color: _kanjiColors.background,
-      ),
    );
  }
 }
--- a/lib/view/components/kanji/kanji_result_body/stroke_order_gif.dart
+++ b/lib/view/components/kanji/kanji_result_body/stroke_order_gif.dart
@ -1,26 +1,28 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/bloc/theme/theme_bloc.dart';
+
+import '../../../../bloc/theme/theme_bloc.dart';

 class StrokeOrderGif extends StatelessWidget {
  final String uri;

-  const StrokeOrderGif(this.uri);
+  const StrokeOrderGif({required this.uri, Key? key,}) : super(key: key);
+

  @override
  Widget build(BuildContext context) {
    final _kanjiColors = BlocProvider.of<ThemeBloc>(context).state.theme.kanjiResultColor;

    return Container(
-      margin: EdgeInsets.symmetric(vertical: 20.0),
-      padding: EdgeInsets.all(5.0),
-      child: ClipRRect(
-        child: Image.network(uri),
-        borderRadius: BorderRadius.circular(10.0),
-      ),
+      margin: const EdgeInsets.symmetric(vertical: 20.0),
+      padding: const EdgeInsets.all(5.0),
      decoration: BoxDecoration(
        color: _kanjiColors.background,
        borderRadius: BorderRadius.circular(15.0),
      ),
+      child: ClipRRect(
+        borderRadius: BorderRadius.circular(10.0),
+        child: Image.network(uri),
+      ),
    );
  }
 }
--- a/lib/view/components/kanji/kanji_result_body/yomi_chips.dart
+++ b/lib/view/components/kanji/kanji_result_body/yomi_chips.dart
@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/bloc/theme/theme_bloc.dart';
+
+import '../../../../bloc/theme/theme_bloc.dart';

 enum YomiType {
  onyomi,
@ -37,86 +38,88 @@ class YomiChips extends StatelessWidget {
  final List<String> yomi;
  final YomiType type;

-  const YomiChips(this.yomi, this.type);
+  const YomiChips({
+    required this.yomi,
+    required this.type,
+    Key? key,
+  }) : super(key: key);

-  @override
-  Widget build(BuildContext context) {
-    return Container(
-      margin: EdgeInsets.symmetric(
+  bool get isExpandable => yomi.length > 6;
+
+  Widget yomiCard({
+    required BuildContext context,
+    required String yomi,
+    required ColorSet colors,
+  }) =>
+      Container(
+        margin: const EdgeInsets.symmetric(horizontal: 10.0),
+        padding: const EdgeInsets.symmetric(
+          vertical: 10.0,
          horizontal: 10.0,
-        vertical: 5.0,
        ),
-      alignment: Alignment.centerLeft,
-      child: _yomiWrapper(context),
+        decoration: BoxDecoration(
+          color: type.getColors(context).background,
+          borderRadius: BorderRadius.circular(10.0),
+        ),
+        child: Text(
+          yomi,
+          style: TextStyle(
+            fontSize: 20.0,
+            color: colors.foreground,
+          ),
+        ),
      );
-  }

-  bool isExpandable() => yomi.length > 6;
-
-  Widget _yomiWrapper(BuildContext context) {
-    final yomiCards = this
-        .yomi
-        .map((yomi) => _YomiCard(
-              yomi: yomi,
-              colors: this.type.getColors(context),
-            ))
+  Widget yomiWrapper(BuildContext context) {
+    final yomiCards = yomi
+        .map(
+          (y) => yomiCard(
+            context: context,
+            yomi: y,
+            colors: type.getColors(context),
+          ),
+        )
        .toList();

-    if (!this.isExpandable())
+    if (!isExpandable)
      return Wrap(
        runSpacing: 10.0,
        children: yomiCards,
      );
-
+    else
      return ExpansionTile(
-      initiallyExpanded: false,
+        // initiallyExpanded: false,
        title: Center(
-        child: _YomiCard(
-          yomi: this.type.title,
-          colors: this.type.getColors(context),
+          child: yomiCard(
+            context: context,
+            yomi: type.title,
+            colors: type.getColors(context),
          ),
        ),
        children: [
-        SizedBox(
+          const SizedBox(
            height: 20.0,
          ),
          Wrap(
            runSpacing: 10.0,
            children: yomiCards,
          ),
-        SizedBox(
+          const SizedBox(
            height: 25.0,
          ),
        ],
      );
  }
-}
-
-class _YomiCard extends StatelessWidget {
-  final String yomi;
-  final ColorSet colors;
-
-  const _YomiCard({required this.yomi, required this.colors});

  @override
  Widget build(BuildContext context) {
    return Container(
-      margin: EdgeInsets.symmetric(horizontal: 10.0),
-      padding: EdgeInsets.symmetric(
-        vertical: 10.0,
+      margin: const EdgeInsets.symmetric(
        horizontal: 10.0,
+        vertical: 5.0,
      ),
-      child: Text(
-        this.yomi,
-        style: TextStyle(
-          fontSize: 20.0,
-          color: colors.foreground,
-        ),
-      ),
-      decoration: BoxDecoration(
-        color: colors.background,
-        borderRadius: BorderRadius.circular(10.0),
-      ),
+      alignment: Alignment.centerLeft,
+      child: yomiWrapper(context),
    );
  }
 }
--- a/lib/view/components/kanji/kanji_search_body.dart
+++ b/lib/view/components/kanji/kanji_search_body.dart
@ -1,13 +1,13 @@
-import 'package:flutter/material.dart';
 import 'package:animated_size_and_fade/animated_size_and_fade.dart';
-import 'package:jisho_study_tool/services/kanji_suggestions.dart';
+import 'package:flutter/material.dart';

-import 'package:jisho_study_tool/view/components/kanji/kanji_search_body/kanji_grid.dart';
-import 'package:jisho_study_tool/view/components/kanji/kanji_search_body/kanji_search_bar.dart';
-import 'package:jisho_study_tool/view/components/kanji/kanji_search_body/kanji_search_options_bar.dart';
+import '../../../services/kanji_suggestions.dart';
+import 'kanji_search_body/kanji_grid.dart';
+import 'kanji_search_body/kanji_search_bar.dart';
+import 'kanji_search_body/kanji_search_options_bar.dart';

 class KanjiSearchBody extends StatefulWidget {
-  KanjiSearchBody({Key? key}) : super(key: key);
+  const KanjiSearchBody({Key? key}) : super(key: key);

  @override
  _KanjiSearchBodyState createState() => _KanjiSearchBodyState();
@ -28,16 +28,18 @@ class _KanjiSearchBodyState extends State<KanjiSearchBody>

    _controller = AnimationController(
      vsync: this,
-      duration: Duration(milliseconds: 200),
+      duration: const Duration(milliseconds: 200),
    );

    _searchbarMovementAnimation = AlignmentTween(
      begin: Alignment.center,
      end: Alignment.topCenter,
-    ).animate(CurvedAnimation(
+    ).animate(
+      CurvedAnimation(
        parent: _controller,
        curve: Curves.easeInOut,
-    ));
+      ),
+    );
  }

  @override
@ -60,15 +62,15 @@ class _KanjiSearchBodyState extends State<KanjiSearchBody>
      child: GestureDetector(
        onTap: () => FocusScope.of(context).unfocus(),
        child: Container(
-          decoration: BoxDecoration(),
+          decoration: const BoxDecoration(),
          alignment: Alignment.center,
-          padding: EdgeInsets.symmetric(horizontal: 20),
+          padding: const EdgeInsets.symmetric(horizontal: 20),
          child: AnimatedBuilder(
            animation: _searchbarMovementAnimation,
-            builder: (BuildContext context, _) {
+            builder: (context, _) {
              return Container(
                alignment: _searchbarMovementAnimation.value,
-                padding: EdgeInsets.symmetric(vertical: 10.0),
+                padding: const EdgeInsets.symmetric(vertical: 10.0),
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
@ -83,17 +85,17 @@ class _KanjiSearchBodyState extends State<KanjiSearchBody>
                      child: KanjiSearchBar(
                        key: _kanjiSearchBarState,
                        onChanged: (text) => setState(() {
-                          this.suggestions = kanjiSuggestions(text);
+                          suggestions = kanjiSuggestions(text);
                        }),
                      ),
                    ),
                    AnimatedSizeAndFade(
                      vsync: this,
-                      child: _controller.value == 1
-                          ? KanjiGrid(this.suggestions)
-                          : KanjiSearchOptionsBar(),
                      fadeDuration: const Duration(milliseconds: 200),
                      sizeDuration: const Duration(milliseconds: 300),
+                      child: _controller.value == 1
+                          ? KanjiGrid(suggestions: suggestions)
+                          : const KanjiSearchOptionsBar(),
                    ),
                  ],
                ),
--- a/lib/view/components/kanji/kanji_search_body/kanji_grid.dart
+++ b/lib/view/components/kanji/kanji_search_body/kanji_grid.dart
@ -1,15 +1,16 @@
 import 'package:flutter/material.dart';

-import 'package:jisho_study_tool/bloc/theme/theme_bloc.dart';
+import '../../../../bloc/theme/theme_bloc.dart';

 class KanjiGrid extends StatelessWidget {
  final List<String> suggestions;
-  const KanjiGrid(this.suggestions);
+
+  const KanjiGrid({required this.suggestions, Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
-      padding: EdgeInsets.symmetric(
+      padding: const EdgeInsets.symmetric(
        vertical: 20.0,
        horizontal: 40.0,
      ),
@ -43,7 +44,7 @@ class _GridItem extends StatelessWidget {
              borderRadius: BorderRadius.circular(20.0),
            ),
            child: Container(
-              margin: EdgeInsets.all(10.0),
+              margin: const EdgeInsets.all(10.0),
              child: FittedBox(
                child: Text(
                  kanji,
--- a/lib/view/components/kanji/kanji_search_body/kanji_search_bar.dart
+++ b/lib/view/components/kanji/kanji_search_body/kanji_search_bar.dart
@ -4,16 +4,16 @@ import 'package:flutter/services.dart';
 class KanjiSearchBar extends StatefulWidget {
  final Function(String)? onChanged;

-  KanjiSearchBar({this.onChanged, Key? key}) : super(key: key);
+  const KanjiSearchBar({this.onChanged, Key? key}) : super(key: key);

  @override
-  KanjiSearchBarState createState() => new KanjiSearchBarState(this.onChanged);
+  KanjiSearchBarState createState() => KanjiSearchBarState(this.onChanged);
 }

 enum TextFieldButton { clear, paste }

 class KanjiSearchBarState extends State<KanjiSearchBar> {
-  final TextEditingController textController = new TextEditingController();
+  final TextEditingController textController = TextEditingController();
  TextFieldButton button = TextFieldButton.paste;
  final Function(String)? onChanged;

@ -33,8 +33,8 @@ class KanjiSearchBarState extends State<KanjiSearchBar> {
    runOnChanged();
  }

-  void pasteText() async {
-    ClipboardData? clipboardData = await Clipboard.getData('text/plain');
+  Future<void> pasteText() async {
+    final ClipboardData? clipboardData = await Clipboard.getData('text/plain');
    if (clipboardData != null && clipboardData.text != null) {
      textController.text = clipboardData.text!;
      runOnChanged();
@ -43,24 +43,24 @@ class KanjiSearchBarState extends State<KanjiSearchBar> {

  @override
  Widget build(BuildContext context) {
-    IconButton clearButton = IconButton(
-      icon: Icon(Icons.clear),
+    final IconButton clearButton = IconButton(
+      icon: const Icon(Icons.clear),
      onPressed: () => clearText(),
    );

-    IconButton pasteButton = IconButton(
-      icon: Icon(Icons.content_paste),
+    final IconButton pasteButton = IconButton(
+      icon: const Icon(Icons.content_paste),
      onPressed: () => pasteText(),
    );

    return TextField(
      controller: textController,
      onChanged: (text) {
-        if (this.onChanged != null) this.onChanged!(text);
+        if (onChanged != null) onChanged!(text);
      },
      onSubmitted: (_) => {},
-      decoration: new InputDecoration(
-        prefixIcon: Icon(Icons.search),
+      decoration: InputDecoration(
+        prefixIcon: const Icon(Icons.search),
        hintText: 'Search',
        // fillColor: Colors.white,
        // filled: true,
--- a/lib/view/components/kanji/kanji_search_body/kanji_search_options_bar.dart
+++ b/lib/view/components/kanji/kanji_search_body/kanji_search_options_bar.dart
@ -12,22 +12,22 @@ class KanjiSearchOptionsBar extends StatelessWidget {
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          _IconButton(
-            icon: Text(
-              "部",
+            icon: const Text(
+              '部',
              style: TextStyle(
                fontWeight: FontWeight.w700,
                fontSize: 18,
              ),
            ),
-            onPressed: () {}
+            onPressed: () {},
          ),
          _IconButton(
-            icon: Icon(Icons.category),
-            onPressed: () {}
+            icon: const Icon(Icons.category),
+            onPressed: () {},
          ),
          _IconButton(
-            icon: Icon(Icons.mode),
-            onPressed: () {}
+            icon: const Icon(Icons.mode),
+            onPressed: () {},
          ),
        ],
      ),
--- a/lib/view/components/opaque_box.dart
+++ b/lib/view/components/opaque_box.dart
@ -9,7 +9,7 @@ class OpaqueBox extends StatelessWidget {
  Widget build(BuildContext context) {
    return Container(
      decoration: BoxDecoration(color: Theme.of(context).scaffoldBackgroundColor),
-      child: this.child,
+      child: child,
    );
  }
 }
--- a/lib/view/components/search/language_selector.dart
+++ b/lib/view/components/search/language_selector.dart
@ -1,12 +1,13 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/models/themes/theme.dart';
 import 'package:shared_preferences/shared_preferences.dart';

+import '../../../models/themes/theme.dart';
+
 class LanguageSelector extends StatefulWidget {
-  const LanguageSelector();
+  const LanguageSelector({Key? key}) : super(key: key);

  @override
-  _LanguageSelectorState createState() => new _LanguageSelectorState();
+  _LanguageSelectorState createState() => _LanguageSelectorState();
 }

 class _LanguageSelectorState extends State<LanguageSelector> {
@ -18,8 +19,7 @@ class _LanguageSelectorState extends State<LanguageSelector> {
    super.initState();
    isSelected = [false, false, false];

-    SharedPreferences.getInstance()
-      .then((prefs) {
+    SharedPreferences.getInstance().then((prefs) {
      this.prefs = prefs;
      setState(() {
        isSelected = _getSelectedStatus() ?? isSelected;
@ -27,11 +27,11 @@ class _LanguageSelectorState extends State<LanguageSelector> {
    });
  }

-  void _updateSelectedStatus() async {
-    await prefs.setStringList('languageSelectorStatus',
-      isSelected
-        .map((b) => b ? '1' : '0')
-        .toList());
+  void _updateSelectedStatus() {
+    prefs.setStringList(
+      'languageSelectorStatus',
+      isSelected.map((b) => b ? '1' : '0').toList(),
+    );
  }

  List<bool>? _getSelectedStatus() {
@ -46,14 +46,14 @@ class _LanguageSelectorState extends State<LanguageSelector> {
    return ToggleButtons(
      selectedColor: AppTheme.jishoGreen.background,
      isSelected: isSelected,
-      children: <Widget> [
-        _LanguageOption("Auto"),
-        _LanguageOption("日本語"),
-        _LanguageOption("English")
+      children: const <Widget>[
+        _LanguageOption('Auto'),
+        _LanguageOption('日本語'),
+        _LanguageOption('English')
      ],
-      onPressed: (int buttonIndex) {
+      onPressed: (buttonIndex) {
        setState(() {
-          for (var i in Iterable.generate(isSelected.length)) {
+          for (final int i in Iterable.generate(isSelected.length)) {
            isSelected[i] = i == buttonIndex;
          }
          _updateSelectedStatus();
@ -61,7 +61,6 @@ class _LanguageSelectorState extends State<LanguageSelector> {
      },
    );
  }
-
 }

 class _LanguageOption extends StatelessWidget {
@ -72,7 +71,7 @@ class _LanguageOption extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
-      padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 20.0),
+      padding: const EdgeInsets.symmetric(vertical: 10.0, horizontal: 20.0),
      child: Center(child: Text(language)),
    );
  }
--- a/lib/view/components/search/search_bar.dart
+++ b/lib/view/components/search/search_bar.dart
@ -1,13 +1,14 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/view/components/search/language_selector.dart';
+
+import 'language_selector.dart';

 class SearchBar extends StatelessWidget {
-  const SearchBar();
+  const SearchBar({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
-      padding: EdgeInsets.symmetric(horizontal: 20.0),
+      padding: const EdgeInsets.symmetric(horizontal: 20.0),
      child: Column(
        children: [
          TextField(
@ -21,10 +22,10 @@ class SearchBar extends StatelessWidget {
              ),
            ),
          ),
-          SizedBox(
+          const SizedBox(
            height: 10.0,
          ),
-          LanguageSelector()
+          const LanguageSelector()
        ],
      ),
    );
--- a/lib/view/components/search/search_result_body.dart
+++ b/lib/view/components/search/search_result_body.dart
@ -1,7 +1,8 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/view/components/search/search_results_body/search_card.dart';
 import 'package:unofficial_jisho_api/api.dart';

+import 'search_results_body/search_card.dart';
+
 class SearchResultsBody extends StatelessWidget {
  final List<JishoResult> results;

@ -13,7 +14,7 @@ class SearchResultsBody extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ListView(
-      children: results.map((result) => SearchResultCard(result)).toList(),
+      children: results.map((result) => SearchResultCard(result: result)).toList(),
    );
  }
 }
--- a/lib/view/components/search/search_results_body/parts/badge.dart
+++ b/lib/view/components/search/search_results_body/parts/badge.dart
@ -1,27 +1,27 @@
 import 'package:flutter/material.dart';

 class Badge extends StatelessWidget {
-  final Widget child;
+  final Widget? child;
  final Color color;

-  const Badge(this.child, this.color);
+  const Badge({this.child, required this.color, Key? key,}) : super(key: key);
+

  @override
  Widget build(BuildContext context) {
    return Container(
-      child: FittedBox(
-        child: Center(
-          child: this.child
-        ),
-      ),
-      padding: EdgeInsets.all(5),
+      padding: const EdgeInsets.all(5),
      width: 30,
      height: 30,
-      margin: EdgeInsets.symmetric(horizontal: 2),
+      margin: const EdgeInsets.symmetric(horizontal: 2),
      decoration: BoxDecoration(
        shape: BoxShape.circle,
-        color: color
+        color: color,
+      ),
+      child: FittedBox(
+        child: Center(
+          child: child,
+        ),
      ),
    );  }
-
 }
--- a/lib/view/components/search/search_results_body/parts/common_badge.dart
+++ b/lib/view/components/search/search_results_body/parts/common_badge.dart
@ -4,16 +4,21 @@ import './badge.dart';
 class CommonBadge extends StatelessWidget {
  final bool isCommon;

-  const CommonBadge(this.isCommon);
+  const CommonBadge({
+    required this.isCommon,
+    Key? key,
+  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Badge(
-      Text(
-        "C",
-        style: TextStyle(color: this.isCommon ? Colors.white : Colors.transparent)
+      color: isCommon ? Colors.green : Colors.transparent,
+      child: Text(
+        'C',
+        style: TextStyle(
+          color: isCommon ? Colors.white : Colors.transparent,
+        ),
      ),
-      this.isCommon ? Colors.green : Colors.transparent
    );
  }
 }
--- a/lib/view/components/search/search_results_body/parts/header.dart
+++ b/lib/view/components/search/search_results_body/parts/header.dart
@ -4,20 +4,23 @@ import 'package:unofficial_jisho_api/api.dart';
 class JapaneseHeader extends StatelessWidget {
  final JishoJapaneseWord word;

-  const JapaneseHeader(this.word);
+  const JapaneseHeader({
+    required this.word,
+    Key? key,
+  }) : super(key: key);
+
+  bool get hasFurigana => word.word != null && word.reading != null;

  @override
  Widget build(BuildContext context) {
-    final hasFurigana = (word.word != null && word.reading != null);
-
    return Container(
      alignment: Alignment.centerLeft,
-      padding: EdgeInsets.only(left: 10.0),
+      padding: const EdgeInsets.only(left: 10.0),
      child: Column(
        children: [
          // TODO: take a look at this logic
-          (hasFurigana) ? Text(word.reading!) : Text(''),
-          (hasFurigana) ? Text(word.word!) : Text(word.reading ?? word.word!),
+          hasFurigana ? Text(word.reading!) : const Text(''),
+          hasFurigana ? Text(word.word!) : Text(word.reading ?? word.word!),
        ],
      ),
    );
--- a/lib/view/components/search/search_results_body/parts/jlpt_badge.dart
+++ b/lib/view/components/search/search_results_body/parts/jlpt_badge.dart
@ -4,22 +4,22 @@ import './badge.dart';
 class JLPTBadge extends StatelessWidget {
  final String jlptLevel;

-  const JLPTBadge(this.jlptLevel);
+  const JLPTBadge({
+    required this.jlptLevel,
+    Key? key,
+  }) : super(key: key);

-  String _extractJlptLevel(String jlptRaw) {
-    return jlptRaw.isNotEmpty ? jlptRaw.substring(5).toUpperCase() : '';
-  }
+  String get formattedJlptLevel =>
+      jlptLevel.isNotEmpty ? jlptLevel.substring(5).toUpperCase() : '';

  @override
  Widget build(BuildContext context) {
    return Badge(
-      Text(
-        _extractJlptLevel(this.jlptLevel),
-        style: TextStyle(
-          color: Colors.white
+      color: jlptLevel.isNotEmpty ? Colors.blue : Colors.transparent,
+      child: Text(
+        formattedJlptLevel,
+        style: const TextStyle(color: Colors.white),
      ),
-      ),
-      this.jlptLevel.isNotEmpty ? Colors.blue : Colors.transparent
    );
  }
 }
--- a/lib/view/components/search/search_results_body/parts/other_forms.dart
+++ b/lib/view/components/search/search_results_body/parts/other_forms.dart
@ -1,28 +1,27 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/bloc/theme/theme_bloc.dart';
 import 'package:unofficial_jisho_api/api.dart';

-class OtherForms extends StatelessWidget {
-  final List<JishoJapaneseWord> otherForms;
+import '../../../../../bloc/theme/theme_bloc.dart';

-  const OtherForms(this.otherForms);
+class OtherForms extends StatelessWidget {
+  final List<JishoJapaneseWord> forms;
+
+  const OtherForms({required this.forms, Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
-    return Container(
-      child: Column(
-        children: this.otherForms.isNotEmpty
+    return Column(
+      children: forms.isNotEmpty
          ? [
-                Text(
+              const Text(
                'Other Forms',
                style: TextStyle(fontWeight: FontWeight.bold),
              ),
              Row(
-                  children: otherForms.map((form) => _KanaBox(form)).toList(),
+                children: forms.map((form) => _KanaBox(form)).toList(),
              ),
            ]
          : [],
-      ),
    );
  }
 }
@ -32,28 +31,19 @@ class _KanaBox extends StatelessWidget {

  const _KanaBox(this.word);

+  bool get hasFurigana => word.word != null;
+
  @override
  Widget build(BuildContext context) {
-    final hasFurigana = (word.word != null);
    final _menuColors =
        BlocProvider.of<ThemeBloc>(context).state.theme.menuGreyLight;

    return Container(
-      child: DefaultTextStyle.merge(
-        child: Column(
-          children: [
-            // TODO: take a look at this logic
-            (hasFurigana) ? Text(word.reading ?? '') : Text(''),
-            (hasFurigana) ? Text(word.word!) : Text(word.reading ?? ''),
-          ],
-        ),
-        style: TextStyle(color: _menuColors.foreground),
-      ),
-      margin: EdgeInsets.symmetric(
+      margin: const EdgeInsets.symmetric(
        horizontal: 5.0,
        vertical: 5.0,
      ),
-      padding: EdgeInsets.all(5.0),
+      padding: const EdgeInsets.all(5.0),
      decoration: BoxDecoration(
        color: _menuColors.background,
        boxShadow: [
@ -61,10 +51,20 @@ class _KanaBox extends StatelessWidget {
            color: Colors.grey.withOpacity(0.5),
            spreadRadius: 1,
            blurRadius: 0.5,
-            offset: Offset(1, 1),
+            offset: const Offset(1, 1),
          ),
        ],
      ),
+      child: DefaultTextStyle.merge(
+        child: Column(
+          children: [
+            // TODO: take a look at this logic
+            hasFurigana ? Text(word.reading ?? '') : const Text(''),
+            hasFurigana ? Text(word.word!) : Text(word.reading ?? ''),
+          ],
+        ),
+        style: TextStyle(color: _menuColors.foreground),
+      ),
    );
  }
 }
--- a/lib/view/components/search/search_results_body/parts/senses.dart
+++ b/lib/view/components/search/search_results_body/parts/senses.dart
@ -4,17 +4,19 @@ import 'package:unofficial_jisho_api/parser.dart';
 class Senses extends StatelessWidget {
  final List<JishoWordSense> senses;

-  const Senses(this.senses);
+  const Senses({
+    required this.senses,
+    Key? key,
+  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final List<Widget> senseWidgets =
        senses.asMap().entries.map((e) => _Sense(e.key, e.value)).toList();

-    return Container(
-        child: Column(
+    return Column(
      children: senseWidgets,
-    ));
+    );
  }
 }

@ -26,37 +28,35 @@ class _Sense extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
-    return Container(
-      child: Column(
+    return Column(
      children: [
        Row(
          children: [
            Text(
-                (index + 1).toString() + '. ',
-                style: TextStyle(color: Colors.grey),
+              '${index + 1}. ',
+              style: const TextStyle(color: Colors.grey),
            ),
            Text(
              sense.partsOfSpeech.join(', '),
-                style: TextStyle(fontWeight: FontWeight.bold),
+              style: const TextStyle(fontWeight: FontWeight.bold),
              textAlign: TextAlign.left,
            ),
          ],
        ),
        Container(
+          padding: const EdgeInsets.symmetric(horizontal: 20),
+          margin: const EdgeInsets.fromLTRB(0, 5, 0, 15),
          child: Row(
-              children:[
+            children: [
              Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
                children:
                    sense.englishDefinitions.map((def) => Text(def)).toList(),
-                  crossAxisAlignment: CrossAxisAlignment.start,
-                ),
-              ]
-            ),
-            padding: EdgeInsets.symmetric(horizontal: 20),
-            margin: EdgeInsets.fromLTRB(0, 5, 0, 15),
              ),
            ],
          ),
+        ),
+      ],
    );
  }
 }
--- a/lib/view/components/search/search_results_body/parts/wanikani_badge.dart
+++ b/lib/view/components/search/search_results_body/parts/wanikani_badge.dart
@ -14,13 +14,13 @@ class WKBadge extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Badge(
-      Text(
+      child: Text(
        _extractWkLevel(this.wkLevel),
        style: TextStyle(
          color: Colors.white,
        ),
      ),
-      this.wkLevel.isNotEmpty ? Colors.red : Colors.transparent
+      color: this.wkLevel.isNotEmpty ? Colors.red : Colors.transparent
    );
  }
 }
--- a/lib/view/components/search/search_results_body/search_card.dart
+++ b/lib/view/components/search/search_results_body/search_card.dart
@ -13,10 +13,12 @@ class SearchResultCard extends StatelessWidget {
  late final JishoJapaneseWord mainWord;
  late final List<JishoJapaneseWord> otherForms;

-  SearchResultCard(this.result) {
-    this.mainWord = result.japanese[0];
-    this.otherForms = result.japanese.sublist(1);
-  }
+  SearchResultCard({
+    required this.result,
+    Key? key,
+  })  : mainWord = result.japanese[0],
+        otherForms = result.japanese.sublist(1),
+        super(key: key);

  @override
  Widget build(BuildContext context) {
@ -24,34 +26,40 @@ class SearchResultCard extends StatelessWidget {
    return ExpansionTile(
      collapsedBackgroundColor: backgroundColor,
      backgroundColor: backgroundColor,
-      title: 
-      IntrinsicWidth(
+      title: IntrinsicWidth(
        child: Row(
+          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
-            JapaneseHeader(mainWord),
+            JapaneseHeader(word: mainWord),
            Row(
              children: [
-                WKBadge(result.tags.firstWhere((tag) => tag.contains("wanikani"), orElse: () => '')),
-                JLPTBadge(result.jlpt.isNotEmpty ? result.jlpt[0] : ''),
-                CommonBadge(result.isCommon ?? false)
+                WKBadge(
+                  result.tags.firstWhere(
+                    (tag) => tag.contains('wanikani'),
+                    orElse: () => '',
+                  ),
+                ),
+                JLPTBadge(
+                  jlptLevel: result.jlpt.isNotEmpty ? result.jlpt[0] : '',
+                ),
+                CommonBadge(isCommon: result.isCommon ?? false)
              ],
            )
          ],
-          mainAxisAlignment: MainAxisAlignment.spaceBetween,
        ),
      ),
      children: [
        Container(
+          padding: const EdgeInsets.symmetric(horizontal: 30),
          child: Column(
            children: [
-              Senses(result.senses),
-              OtherForms(otherForms),
+              Senses(senses: result.senses),
+              OtherForms(forms: otherForms),
              // Text(result.toJson().toString()),
              // Text(result.attribution.toJson().toString()),
              // Text(result.japanese.map((e) => e.toJson().toString()).toList().toString()),
            ],
          ),
-          padding: EdgeInsets.symmetric(horizontal: 30),
        )
      ],
    );
--- a/lib/view/screens/history.dart
+++ b/lib/view/screens/history.dart
@ -1,75 +1,37 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/bloc/database/database_bloc.dart';
-import 'package:jisho_study_tool/models/history/search.dart';
-import 'package:jisho_study_tool/view/components/history/kanji_search_item.dart';
-import 'package:jisho_study_tool/view/components/history/phrase_search_item.dart';
-import 'package:jisho_study_tool/view/components/history/date_divider.dart';

-import 'package:jisho_study_tool/objectbox.g.dart';
-import 'package:jisho_study_tool/view/components/opaque_box.dart';
+import '../../bloc/database/database_bloc.dart';
+import '../../models/history/search.dart';
+import '../../objectbox.g.dart';
+import '../components/history/date_divider.dart';
+import '../components/history/kanji_search_item.dart';
+import '../components/history/phrase_search_item.dart';
+import '../components/opaque_box.dart';

 class HistoryView extends StatelessWidget {
+  const HistoryView({Key? key}) : super(key: key);
+
  @override
  Widget build(BuildContext context) {
    return BlocBuilder<DatabaseBloc, DatabaseState>(
      builder: (context, state) {
-        if (state is DatabaseDisconnected)
+        if (state is DatabaseDisconnected) {
          throw DatabaseNotConnectedException();
+        }

-        return StreamBuilder(
-          stream: ((state as DatabaseConnected).database.box<Search>().query()
-                ..order(Search_.timestamp, flags: Order.descending))
-              .watch(triggerImmediately: true)
-              .map((query) => query.find()),
-          builder: (BuildContext context, AsyncSnapshot snapshot) {
-            if (!snapshot.hasData) return Container();
+        return StreamBuilder<List<Search>>(
+          stream: getAsyncStream(state),
+          builder: (context, snapshot) {
+            if (!snapshot.hasData) {
+              return Container();
+            }
+
+            final List<Search> data = snapshot.data!;
            return OpaqueBox(
              child: ListView.separated(
-                itemCount: snapshot.data.length + 1,
-                itemBuilder: (context, index) {
-                  if (index == 0) return Container();
-                  Search search = snapshot.data[index - 1];
-                  if (search.isKanji()) {
-                    return KanjiSearchItem(
-                      result: search.kanjiQuery.target!,
-                      timestamp: search.timestamp,
-                    );
-                  }
-                  return PhraseSearchItem(
-                    search: search.wordQuery.target!,
-                    timestamp: search.timestamp,
-                  );
-                },
-                separatorBuilder: (context, index) {
-                  Function roundToDay = (DateTime date) =>
-                      DateTime(date.year, date.month, date.day);
-
-                  Search search = snapshot.data[index];
-                  DateTime searchDate = roundToDay(search.timestamp);
-
-                  bool newDate = true;
-
-                  EdgeInsets? margin;
-                  if (index != 0) {
-                    Search prevSearch = snapshot.data[index - 1];
-
-                    DateTime prevSearchDate = roundToDay(prevSearch.timestamp);
-                    newDate = prevSearchDate != searchDate;
-                    margin = EdgeInsets.only(bottom: 10);
-                  }
-
-                  if (newDate) {
-                    if (searchDate == roundToDay(DateTime.now()))
-                      return DateDivider(text: "Today", margin: margin);
-                    else if (searchDate ==
-                        roundToDay(
-                            DateTime.now().subtract(const Duration(days: 1))))
-                      return DateDivider(text: "Yesterday", margin: margin);
-                    return DateDivider(date: searchDate, margin: margin);
-                  }
-
-                  return Divider();
-                },
+                itemCount: data.length + 1,
+                itemBuilder: historyEntryWithData(data),
+                separatorBuilder: historyEntrySeparatorWithData(data),
              ),
            );
          },
@ -77,4 +39,68 @@ class HistoryView extends StatelessWidget {
      },
    );
  }
+
+  Stream<List<Search>> getAsyncStream(DatabaseState state) =>
+      ((state as DatabaseConnected).database.box<Search>().query()
+            ..order(Search_.timestamp, flags: Order.descending))
+          .watch(triggerImmediately: true)
+          .map((query) => query.find());
+
+  Widget Function(BuildContext, int) historyEntryWithData(List<Search> data) =>
+      (context, index) {
+        if (index == 0) {
+          return Container();
+        }
+
+        final Search search = data[index - 1];
+
+        if (search.isKanji()) {
+          return KanjiSearchItem(
+            result: search.kanjiQuery.target!,
+            timestamp: search.timestamp,
+          );
+        } else {
+          return PhraseSearchItem(
+            search: search.wordQuery.target!,
+            timestamp: search.timestamp,
+          );
+        }
+      };
+
+  DateTime roundToDay(DateTime date) =>
+      DateTime(date.year, date.month, date.day);
+
+  bool dateChangedFromLastSearch(Search prevSearch, DateTime searchDate) {
+    final DateTime prevSearchDate = roundToDay(prevSearch.timestamp);
+    return prevSearchDate != searchDate;
+  }
+
+  DateTime get today => roundToDay(DateTime.now());
+  DateTime get yesterday =>
+      roundToDay(DateTime.now().subtract(const Duration(days: 1)));
+
+  Widget Function(BuildContext, int) historyEntrySeparatorWithData(
+    List<Search> data,
+  ) =>
+      (context, index) {
+        final Search search = data[index];
+        final DateTime searchDate = roundToDay(search.timestamp);
+
+        EdgeInsets? margin;
+        if (index != 0) {
+          margin = const EdgeInsets.only(bottom: 10);
+        }
+
+        if (index == 0 ||
+            dateChangedFromLastSearch(data[index - 1], searchDate)) {
+          if (searchDate == today)
+            return DateDivider(text: 'Today', margin: margin);
+          else if (searchDate == yesterday)
+            return DateDivider(text: 'Yesterday', margin: margin);
+          else
+            return DateDivider(date: searchDate, margin: margin);
+        }
+
+        return const Divider();
+      };
 }
--- a/lib/view/screens/search/kanji_result_page.dart
+++ b/lib/view/screens/search/kanji_result_page.dart
@ -1,40 +1,40 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/bloc/database/database_bloc.dart';
-import 'package:jisho_study_tool/models/history/kanji_query.dart';
-import 'package:jisho_study_tool/models/history/search.dart';
-import 'package:jisho_study_tool/view/components/common/loading.dart';
-import 'package:jisho_study_tool/view/components/kanji/kanji_result_body.dart';
-import 'package:jisho_study_tool/services/jisho_api/kanji_search.dart';
+
+import '../../../bloc/database/database_bloc.dart';
+import '../../../models/history/kanji_query.dart';
+import '../../../models/history/search.dart';
+import '../../../services/jisho_api/kanji_search.dart';
+import '../../components/common/loading.dart';
+import '../../components/kanji/kanji_result_body.dart';

 class KanjiResultPage extends StatelessWidget {
  final String kanjiSearchTerm;
  bool addedToDatabase = false;

-  KanjiResultPage({required this.kanjiSearchTerm, Key? key})
-      : super(key: key);
+  KanjiResultPage({required this.kanjiSearchTerm, Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
-      body: FutureBuilder(
-        future: fetchKanji(this.kanjiSearchTerm),
-        builder: (context, snapshot) {
+      body: FutureBuilder<KanjiResult>(
+        future: fetchKanji(kanjiSearchTerm),
+        builder: ( context, snapshot) {
          if (!snapshot.hasData) return LoadingScreen();
          if (snapshot.hasError) return ErrorWidget(snapshot.error!);

-          if (!this.addedToDatabase) {
+          if (!addedToDatabase) {
            (BlocProvider.of<DatabaseBloc>(context).state as DatabaseConnected)
                .database
                .box<Search>()
                .put(Search(timestamp: DateTime.now())
                  ..kanjiQuery.target = KanjiQuery(
-                    kanji: this.kanjiSearchTerm,
-                  ));
-            this.addedToDatabase = true;
+                    kanji: kanjiSearchTerm,
+                  ),);
+            addedToDatabase = true;
          }

-          return KanjiResultBody(result: (snapshot.data as KanjiResult));
+          return KanjiResultBody(result: snapshot.data!);
        },
      ),
    );
--- a/lib/view/screens/search/kanji_view.dart
+++ b/lib/view/screens/search/kanji_view.dart
@ -1,9 +1,11 @@

 import 'package:flutter/material.dart';

-import 'package:jisho_study_tool/view/components/kanji/kanji_search_body.dart';
+import '../../components/kanji/kanji_search_body.dart';

 class KanjiView extends StatelessWidget {
+  const KanjiView({Key? key}) : super(key: key);
+
  @override
  Widget build(BuildContext context) {
    return KanjiSearchBody();
--- a/lib/view/screens/search/search_mechanisms/grid.dart
+++ b/lib/view/screens/search/search_mechanisms/grid.dart
@ -1,22 +1,24 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/view/components/kanji/kanji_search_body/kanji_grid.dart';
-import 'package:jisho_study_tool/view/components/kanji/kanji_search_body/kanji_search_bar.dart';
+
+import '../../../components/kanji/kanji_search_body/kanji_grid.dart';
+import '../../../components/kanji/kanji_search_body/kanji_search_bar.dart';

 class SearchGrid extends StatelessWidget {
  final List<String> suggestions;
-  const SearchGrid(this.suggestions);
+
+  const SearchGrid({
+    required this.suggestions,
+    Key? key,
+  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
-    return 
-      Column(
+    return Column(
      children: [
-          SizedBox(height: 10),
-          KanjiSearchBar(),
-          SizedBox(height: 10),
-          Expanded(
-            child: KanjiGrid(suggestions)
-          )
+        const SizedBox(height: 10),
+        const KanjiSearchBar(),
+        const SizedBox(height: 10),
+        Expanded(child: KanjiGrid(suggestions: suggestions))
      ],
    );
  }
--- a/lib/view/screens/search/search_results_page.dart
+++ b/lib/view/screens/search/search_results_page.dart
@ -1,10 +1,11 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/bloc/database/database_bloc.dart';
-import 'package:jisho_study_tool/models/history/search.dart';
-import 'package:jisho_study_tool/models/history/word_query.dart';
-import 'package:jisho_study_tool/view/components/common/loading.dart';
-import 'package:jisho_study_tool/view/components/search/search_result_body.dart';
-import 'package:jisho_study_tool/services/jisho_api/jisho_search.dart';
+
+import '../../../bloc/database/database_bloc.dart';
+import '../../../models/history/search.dart';
+import '../../../models/history/word_query.dart';
+import '../../../services/jisho_api/jisho_search.dart';
+import '../../components/common/loading.dart';
+import '../../components/search/search_result_body.dart';

 class SearchResultsPage extends StatelessWidget {
  final String searchTerm;
@ -12,34 +13,35 @@ class SearchResultsPage extends StatelessWidget {
  bool addedToDatabase = false;

  SearchResultsPage({required this.searchTerm, Key? key})
-      : this.results = fetchJishoResults(searchTerm),
+      : results = fetchJishoResults(searchTerm),
        super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
-      body: FutureBuilder(
+      body: FutureBuilder<JishoAPIResult>(
        future: results,
        builder: (context, snapshot) {
          if (!snapshot.hasData) return LoadingScreen();
-          if (snapshot.hasError ||
-              (snapshot.data as JishoAPIResult).data == null)
+          if (snapshot.hasError || snapshot.data!.data == null)
            return ErrorWidget(snapshot.error!);

-          if (!this.addedToDatabase) {
+          if (!addedToDatabase) {
            (BlocProvider.of<DatabaseBloc>(context).state as DatabaseConnected)
                .database
                .box<Search>()
-                .put(Search(timestamp: DateTime.now())
+                .put(
+                  Search(timestamp: DateTime.now())
                    ..wordQuery.target = WordQuery(
-                    query: this.searchTerm,
-                  ));
-            this.addedToDatabase = true;
+                      query: searchTerm,
+                    ),
+                );
+            addedToDatabase = true;
          }

          return SearchResultsBody(
-            results: (snapshot.data as JishoAPIResult).data!,
+            results: snapshot.data!.data!,
          );
        },
      ),
--- a/lib/view/screens/search/search_view.dart
+++ b/lib/view/screens/search/search_view.dart
@ -1,12 +1,14 @@
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/view/components/search/search_bar.dart';
+import '../../components/search/search_bar.dart';

 class SearchView extends StatelessWidget {
+  const SearchView({Key? key}) : super(key: key);
+
  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
-      children: [
+      children: const <Widget>[
        SearchBar(),
      ],
    );
--- a/lib/view/screens/settings.dart
+++ b/lib/view/screens/settings.dart
@ -1,15 +1,16 @@
 import 'package:confirm_dialog/confirm_dialog.dart';
 import 'package:flutter/material.dart';
-import 'package:jisho_study_tool/bloc/database/database_bloc.dart';
-import 'package:jisho_study_tool/bloc/theme/theme_bloc.dart';
-import 'package:jisho_study_tool/models/history/search.dart';
-import 'package:jisho_study_tool/models/themes/theme.dart';
-import 'package:jisho_study_tool/objectbox.g.dart';
 import 'package:settings_ui/settings_ui.dart';
 import 'package:shared_preferences/shared_preferences.dart';

+import '../../bloc/database/database_bloc.dart';
+import '../../bloc/theme/theme_bloc.dart';
+import '../../models/history/search.dart';
+import '../../models/themes/theme.dart';
+import '../../objectbox.g.dart';
+
 class SettingsView extends StatefulWidget {
-  SettingsView({Key? key}) : super(key: key);
+  const SettingsView({Key? key}) : super(key: key);

  @override
  _SettingsViewState createState() => _SettingsViewState();
@ -40,25 +41,27 @@ class _SettingsViewState extends State<SettingsView> {
  }

  /// Update stored preferences with values from setting page state
-  void _updatePrefs() async {
-    await prefs.setBool('darkThemeEnabled', darkThemeEnabled);
-    await prefs.setBool('autoThemeEnabled', autoThemeEnabled);
+  void _updatePrefs() {
+    prefs.setBool('darkThemeEnabled', darkThemeEnabled);
+    prefs.setBool('autoThemeEnabled', autoThemeEnabled);
  }

+  @override
  Widget build(BuildContext context) {
    final TextStyle _titleTextStyle = TextStyle(
      color: BlocProvider.of<ThemeBloc>(context).state is DarkThemeState
          ? AppTheme.jishoGreen.background
-            : null);
+          : null,
+    );

    return SettingsList(
      backgroundColor: Colors.transparent,
-      contentPadding: EdgeInsets.symmetric(vertical: 10),
-      sections: [
+      contentPadding: const EdgeInsets.symmetric(vertical: 10),
+      sections: <SettingsSection>[
        SettingsSection(
          title: 'Theme',
          titleTextStyle: _titleTextStyle,
-          tiles: [
+          tiles: <SettingsTile>[
            SettingsTile.switchTile(
              title: 'Automatically determine theme',
              onToggle: (b) {
@ -74,7 +77,8 @@ class _SettingsViewState extends State<SettingsView> {
            SettingsTile.switchTile(
              title: 'Dark Theme',
              onToggle: (b) {
-                BlocProvider.of<ThemeBloc>(context).add(SetTheme(themeIsDark: b));
+                BlocProvider.of<ThemeBloc>(context)
+                    .add(SetTheme(themeIsDark: b));
                setState(() {
                  darkThemeEnabled = b;
                });
@ -89,7 +93,7 @@ class _SettingsViewState extends State<SettingsView> {
        SettingsSection(
          title: 'Cache',
          titleTextStyle: _titleTextStyle,
-          tiles: [
+          tiles: <SettingsTile>[
            SettingsTile.switchTile(
              title: 'Cache grade 1-7 kanji',
              switchValue: false,
@ -123,13 +127,13 @@ class _SettingsViewState extends State<SettingsView> {
        SettingsSection(
          title: 'Data',
          titleTextStyle: _titleTextStyle,
-          tiles: [
-            SettingsTile(
+          tiles: <SettingsTile>[
+            const SettingsTile(
              leading: Icon(Icons.file_download),
              title: 'Export Data',
              enabled: false,
            ),
-            SettingsTile(
+            const SettingsTile(
              leading: Icon(Icons.delete),
              title: 'Clear History',
              onPressed: _clearHistory,
@ -137,10 +141,10 @@ class _SettingsViewState extends State<SettingsView> {
              enabled: false,
            ),
            SettingsTile(
-              leading: Icon(Icons.delete),
+              leading: const Icon(Icons.delete),
              title: 'Clear Favourites',
              onPressed: (c) {},
-              titleTextStyle: TextStyle(color: Colors.red),
+              titleTextStyle: const TextStyle(color: Colors.red),
              enabled: false,
            )
          ],
@ -150,12 +154,14 @@ class _SettingsViewState extends State<SettingsView> {
  }
 }

-void _clearHistory(context) async {
-  if (await confirm(context)) {
-    Store db =
+void _clearHistory(context) {
+  confirm(context).then((userIsSure) {
+    if (userIsSure) {
+      final Store db =
          (BlocProvider.of<DatabaseBloc>(context).state as DatabaseConnected)
              .database;
      // db.box<Search>().query().build().find()
      db.box<Search>().removeAll();
    }
+  });
 }
--- a/pubspec.lock
+++ b/pubspec.lock
@ -119,7 +119,7 @@ packages:
      name: characters
      url: "https://pub.dartlang.org"
    source: hosted
-    version: "1.1.0"
+    version: "1.2.0"
  charcode:
    dependency: transitive
    description:
--- a/test/widget_test.dart
+++ b/test/widget_test.dart
@ -1,30 +0,0 @@
-// This is a basic Flutter widget test.
-//
-// To perform an interaction with a widget in your test, use the WidgetTester
-// utility that Flutter provides. For example, you can send tap and scroll
-// gestures. You can also use WidgetTester to find child widgets in the widget
-// tree, read text, and verify that the values of widget properties are correct.
-
-import 'package:flutter/material.dart';
-import 'package:flutter_test/flutter_test.dart';
-
-import 'package:jisho_study_tool/main.dart';
-
-void main() {
-  testWidgets('Counter increments smoke test', (WidgetTester tester) async {
-    // Build our app and trigger a frame.
-    await tester.pumpWidget(MyApp());
-
-    // Verify that our counter starts at 0.
-    expect(find.text('0'), findsOneWidget);
-    expect(find.text('1'), findsNothing);
-
-    // Tap the '+' icon and trigger a frame.
-    await tester.tap(find.byIcon(Icons.add));
-    await tester.pump();
-
-    // Verify that our counter has incremented.
-    expect(find.text('0'), findsNothing);
-    expect(find.text('1'), findsOneWidget);
-  });
-}