[material_ui] Migrate M3 BottomAppBar template to use new gen_defaults

packages/material_ui/lib/src/bottom_app_bar.dart

@@ -20,6 +20,8 @@ import 'material.dart';
 import 'scaffold.dart';
 import 'theme.dart';
 
+part 'generated/bottom_app_bar_defaults_m3.g.dart';
+
 // Examples can assume:
 // late Widget bottomAppBarContents;
 
@@ -303,35 +305,3 @@ class _BottomAppBarDefaultsM2 extends BottomAppBarThemeData {
   @override
   Color get shadowColor => const Color(0xFF000000);
 }
-
-// BEGIN GENERATED TOKEN PROPERTIES - BottomAppBar
-
-// Do not edit by hand. The code between the "BEGIN GENERATED" and
-// "END GENERATED" comments are generated from data in the Material
-// Design token database by the script:
-//   dev/tools/gen_defaults/bin/gen_defaults.dart.
-
-// dart format off
-class _BottomAppBarDefaultsM3 extends BottomAppBarThemeData {
-  _BottomAppBarDefaultsM3(this.context)
-    : super(
-      elevation: 3.0,
-      height: 80.0,
-      shape: const AutomaticNotchedShape(RoundedRectangleBorder()),
-    );
-
-  final BuildContext context;
-  late final ColorScheme _colors = Theme.of(context).colorScheme;
-
-  @override
-  Color? get color => _colors.surfaceContainer;
-
-  @override
-  Color? get surfaceTintColor => Colors.transparent;
-
-  @override
-  Color? get shadowColor => Colors.transparent;
-}
-// dart format on
-
-// END GENERATED TOKEN PROPERTIES - BottomAppBar

packages/material_ui/tool/gen_defaults/temporarily_excluded/generated/bottom_app_bar_defaults.g.dart → packages/material_ui/lib/src/generated/bottom_app_bar_defaults_m3.g.dart

@@ -2,6 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// Do not edit by hand. The code is generated from data in the Material
+// Design token database by the script:
+//   packages/material_ui/tool/gen_defaults/bin/gen_defaults.dart.
+part of '../bottom_app_bar.dart';
+
 class _BottomAppBarDefaultsM3 extends BottomAppBarThemeData {
   _BottomAppBarDefaultsM3(this.context)
     : super(

packages/material_ui/tool/gen_defaults/bin/gen_defaults.dart

@@ -13,6 +13,7 @@
 import 'package:args/args.dart';
 
 import '../templates/app_bar_template.dart';
+import '../templates/bottom_app_bar_template.dart';
 
 Future<void> main(List<String> args) async {
   // Parse arguments
@@ -22,4 +23,5 @@ Future<void> main(List<String> args) async {
   // TODO(elliette): Add token logger when verbose flag is used.
   final verbose = argResults['verbose'] as bool;
   const AppBarTemplateM3().generateFile(verbose: verbose);
+  const BottomAppBarTemplateM3().generateFile(verbose: verbose);
 }

packages/material_ui/tool/gen_defaults/templates/bottom_app_bar_template.dart

@@ -0,0 +1,40 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import '../data/bottom_app_bar.dart';
+import 'template.dart';
+
+class BottomAppBarTemplateM3 extends TokenTemplateM3 {
+  const BottomAppBarTemplateM3();
+
+  @override
+  String get name => 'Bottom App Bar';
+
+  @override
+  String get parentFilePath => 'bottom_app_bar.dart';
+
+  @override
+  String generateContents(String className) => '''
+class $className extends BottomAppBarThemeData {
+  $className(this.context)
+    : super(
+      elevation: ${number(TokenBottomAppBar.containerElevation)},
+      height: ${number(TokenBottomAppBar.containerHeight)},
+      shape: const AutomaticNotchedShape(${shape(TokenBottomAppBar.containerShape, '')}),
+    );
+
+  final BuildContext context;
+  late final ColorScheme _colors = Theme.of(context).colorScheme;
+
+  @override
+  Color? get color => ${color(TokenBottomAppBar.containerColor, '_colors')};
+
+  @override
+  Color? get surfaceTintColor => Colors.transparent;
+
+  @override
+  Color? get shadowColor => Colors.transparent;
+}
+''';
+}

packages/material_ui/tool/gen_defaults/test/gen_defaults_test.dart

@@ -8,6 +8,7 @@ import 'package:test/test.dart';
 import '../data/color_role.dart';
 import '../data/shape_struct.dart';
 import '../templates/app_bar_template.dart';
+import '../templates/bottom_app_bar_template.dart';
 import '../templates/template.dart';
 import 'test_fixtures/test_templates.dart';
 
@@ -159,6 +160,19 @@ void main() {
       expect(contents, contains('static const double expandedHeight = 112.0'));
       expect(contents, contains('static const double expandedHeight = 152.0'));
     });
+
+    test('BottomAppBarTemplateM3 emits M3 BottomAppBar defaults from bottom app bar tokens', () {
+      final String contents = const BottomAppBarTemplateM3().generateContents(
+        '_BottomAppBarDefaultsM3',
+      );
+      expect(contents, contains('class _BottomAppBarDefaultsM3 extends BottomAppBarThemeData'));
+      expect(contents, contains('elevation: 3.0'));
+      expect(contents, contains('height: 80.0'));
+      expect(contents, contains('shape: const AutomaticNotchedShape(RoundedRectangleBorder())'));
+      expect(contents, contains('Color? get color => _colors.surfaceContainer'));
+      expect(contents, contains('Color? get surfaceTintColor => Colors.transparent'));
+    });
+
     test('will run dart format over the generated file', () {
       final template = UnformattedTemplate(testPath());
       template.generateFile();