Add `AnimatedIcons` previews and examples (#113700)

examples/api/lib/material/animated_icon/animated_icon.0.dart

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/// Flutter code sample for [AnimatedIcon].
+
+import 'package:flutter/material.dart';
+
+void main() {
+  runApp(const AnimatedIconApp());
+}
+
+class AnimatedIconApp extends StatelessWidget {
+  const AnimatedIconApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      theme: ThemeData(
+        colorSchemeSeed: const Color(0xff6750a4),
+        useMaterial3: true,
+      ),
+      home: const Scaffold(
+        body: AnimatedIconExample(),
+      ),
+    );
+  }
+}
+
+class AnimatedIconExample extends StatefulWidget {
+  const AnimatedIconExample({super.key});
+
+  @override
+  State<AnimatedIconExample> createState() => _AnimatedIconExampleState();
+}
+
+class _AnimatedIconExampleState extends State<AnimatedIconExample> with SingleTickerProviderStateMixin {
+  late AnimationController controller;
+  late Animation<double> animation;
+
+  @override
+  void initState() {
+    super.initState();
+    controller = AnimationController(
+      vsync: this,
+      duration: const Duration(seconds: 2),
+    )..forward()
+     ..repeat(reverse: true);
+    animation = Tween<double>(begin: 0.0, end: 1.0).animate(controller);
+  }
+
+  @override
+  void dispose() {
+    controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Center(
+        child: AnimatedIcon(
+          icon: AnimatedIcons.menu_arrow,
+          progress: animation,
+          size: 72.0,
+          semanticLabel: 'Show menu',
+        ),
+      ),
+    );
+  }
+}

examples/api/lib/material/animated_icon/animated_icon.1.dart

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/// Flutter code sample for [AnimatedIcon].
+
+import 'package:flutter/material.dart';
+
+final Map<String, AnimatedIconData> iconsList = <String, AnimatedIconData>{
+  'add_event': AnimatedIcons.add_event,
+  'arrow_menu': AnimatedIcons.arrow_menu,
+  'close_menu': AnimatedIcons.close_menu,
+  'ellipsis_search': AnimatedIcons.ellipsis_search,
+  'event_add': AnimatedIcons.event_add,
+  'home_menu': AnimatedIcons.home_menu,
+  'list_view': AnimatedIcons.list_view,
+  'menu_arrow': AnimatedIcons.menu_arrow,
+  'menu_close': AnimatedIcons.menu_close,
+  'menu_home': AnimatedIcons.menu_home,
+  'pause_play': AnimatedIcons.pause_play,
+  'play_pause': AnimatedIcons.play_pause,
+  'search_ellipsis': AnimatedIcons.search_ellipsis,
+  'view_list': AnimatedIcons.view_list,
+};
+
+void main() {
+  runApp(const AnimatedIconApp());
+}
+
+class AnimatedIconApp extends StatelessWidget {
+  const AnimatedIconApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      theme: ThemeData(
+        colorSchemeSeed: const Color(0xff6750a4),
+        useMaterial3: true,
+      ),
+      home: const Scaffold(
+        body: AnimatedIconExample(),
+      ),
+    );
+  }
+}
+
+class AnimatedIconExample extends StatefulWidget {
+  const AnimatedIconExample({super.key});
+
+  @override
+  State<AnimatedIconExample> createState() => _AnimatedIconExampleState();
+}
+
+class _AnimatedIconExampleState extends State<AnimatedIconExample> with SingleTickerProviderStateMixin {
+  late AnimationController controller;
+  late Animation<double> animation;
+
+  @override
+  void initState() {
+    super.initState();
+    controller = AnimationController(
+      vsync: this,
+      duration: const Duration(seconds: 2),
+    )..forward()
+     ..repeat(reverse: true);
+    animation = Tween<double>(begin: 0.0, end: 1.0).animate(controller);
+  }
+
+  @override
+  void dispose() {
+    controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: GridView(
+        gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
+          crossAxisCount: 4,
+        ),
+        children: iconsList.entries.map((MapEntry<String, AnimatedIconData> entry) {
+          return Card(
+            child: Center(
+              child: Column(
+                mainAxisAlignment: MainAxisAlignment.center,
+                children: <Widget>[
+                  AnimatedIcon(
+                    icon: entry.value,
+                    progress: animation,
+                    size: 72.0,
+                    semanticLabel: entry.key,
+                  ),
+                  const SizedBox(height: 8.0),
+                  Text(entry.key),
+                ],
+              ),
+            ),
+          );
+        }).toList(),
+      ),
+    );
+  }
+}

examples/api/test/material/animated_icon/animated_icon.0_test.dart

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_api_samples/material/animated_icon/animated_icon.0.dart'
+    as example;
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('AnimatedIcon animates', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const example.AnimatedIconApp(),
+    );
+
+    // Test the AnimatedIcon size.
+    final Size iconSize = tester.getSize(find.byType(AnimatedIcon));
+    expect(iconSize.width, 72.0);
+    expect(iconSize.height, 72.0);
+
+    // Check if AnimatedIcon is animating.
+    await tester.pump(const Duration(milliseconds: 500));
+    AnimatedIcon animatedIcon = tester.widget(find.byType(AnimatedIcon));
+    expect(animatedIcon.progress.value, 0.25);
+
+    // Check if animation is completed.
+    await tester.pump(const Duration(milliseconds: 1500));
+    animatedIcon = tester.widget(find.byType(AnimatedIcon));
+    expect(animatedIcon.progress.value, 1.0);
+  });
+}

examples/api/test/material/animated_icon/animated_icon.1_test.dart

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_api_samples/material/animated_icon/animated_icon.1.dart'
+    as example;
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('Show all the animated icons', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const example.AnimatedIconApp(),
+    );
+
+    // Check if the total number of AnimatedIcons matches the icons list.
+    expect(find.byType(AnimatedIcon, skipOffstage: false), findsNWidgets(example.iconsList.length));
+
+    // Test the AnimatedIcon size.
+    final Size iconSize = tester.getSize(find.byType(AnimatedIcon).first);
+    expect(iconSize.width, 72.0);
+    expect(iconSize.height, 72.0);
+
+    // Check if AnimatedIcon is animating.
+    await tester.pump(const Duration(milliseconds: 500));
+    AnimatedIcon animatedIcon = tester.widget(find.byType(AnimatedIcon).first);
+    expect(animatedIcon.progress.value, 0.25);
+
+    // Check if animation is completed.
+    await tester.pump(const Duration(milliseconds: 1500));
+    animatedIcon = tester.widget(find.byType(AnimatedIcon).first);
+    expect(animatedIcon.progress.value, 1.0);
+  });
+}

packages/flutter/lib/src/material/animated_icons/animated_icons.dart

@@ -9,26 +9,29 @@ part of material_animated_icons;
 // See: https://github.com/flutter/flutter/issues/1831 for details regarding
 // generic vector graphics support in Flutter.
 
-// Examples can assume:
-// late AnimationController controller;
-
 /// Shows an animated icon at a given animation [progress].
 ///
 /// The available icons are specified in [AnimatedIcons].
 ///
 /// {@youtube 560 315 https://www.youtube.com/watch?v=pJcbh8pbvJs}
 ///
-/// {@tool snippet}
+/// {@tool dartpad}
+/// This example shows how to create an animated icon. The icon is animated
+/// forward and reverse in a loop.
 ///
-/// ```dart
-/// AnimatedIcon(
-///   icon: AnimatedIcons.menu_arrow,
-///   progress: controller,
-///   semanticLabel: 'Show menu',
-/// )
-/// ```
+/// ** See code in examples/api/lib/material/animated_icon/animated_icon.0.dart **
 /// {@end-tool}
 ///
+/// {@tool dartpad}
+/// This example showcases all the available [AnimatedIcons] in a [GridView].
+/// The icons are animated forward and reverse in a loop.
+///
+/// ** See code in examples/api/lib/material/animated_icon/animated_icon.1.dart **
+/// {@end-tool}
+///
+/// See also:
+///
+///  * [Icons], for the list of available static Material Icons.
 class AnimatedIcon extends StatelessWidget {
   /// Creates an AnimatedIcon.
   ///

packages/flutter/lib/src/material/animated_icons/animated_icons_data.dart

@@ -16,45 +16,73 @@ part of material_animated_icons;
 abstract class AnimatedIcons {
 
   /// The Material Design add to event icon animation.
+  ///
+  /// {@animation 72 72 https://flutter.github.io/assets-for-api-docs/assets/widgets/add_event.mp4}
   static const AnimatedIconData add_event = _$add_event;
 
   /// The Material Design arrow to menu icon animation.
+  ///
+  /// {@animation 72 72 https://flutter.github.io/assets-for-api-docs/assets/widgets/arrow_menu.mp4}
   static const AnimatedIconData arrow_menu = _$arrow_menu;
 
   /// The Material Design close to menu icon animation.
+  ///
+  /// {@animation 72 72 https://flutter.github.io/assets-for-api-docs/assets/widgets/close_menu.mp4}
   static const AnimatedIconData close_menu = _$close_menu;
 
   /// The Material Design ellipsis to search icon animation.
+  ///
+  /// {@animation 72 72 https://flutter.github.io/assets-for-api-docs/assets/widgets/ellipsis_search.mp4}
   static const AnimatedIconData ellipsis_search = _$ellipsis_search;
 
   /// The Material Design event to add icon animation.
+  ///
+  /// {@animation 72 72 https://flutter.github.io/assets-for-api-docs/assets/widgets/event_add.mp4}
   static const AnimatedIconData event_add = _$event_add;
 
   /// The Material Design home to menu icon animation.
+  ///
+  /// {@animation 72 72 https://flutter.github.io/assets-for-api-docs/assets/widgets/home_menu.mp4}
   static const AnimatedIconData home_menu = _$home_menu;
 
   /// The Material Design list to view icon animation.
+  ///
+  /// {@animation 72 72 https://flutter.github.io/assets-for-api-docs/assets/widgets/list_view.mp4}
   static const AnimatedIconData list_view = _$list_view;
 
   /// The Material Design menu to arrow icon animation.
+  ///
+  /// {@animation 72 72 https://flutter.github.io/assets-for-api-docs/assets/widgets/menu_arrow.mp4}
   static const AnimatedIconData menu_arrow = _$menu_arrow;
 
   /// The Material Design menu to close icon animation.
+  ///
+  /// {@animation 72 72 https://flutter.github.io/assets-for-api-docs/assets/widgets/menu_close.mp4}
   static const AnimatedIconData menu_close = _$menu_close;
 
   /// The Material Design menu to home icon animation.
+  ///
+  /// {@animation 72 72 https://flutter.github.io/assets-for-api-docs/assets/widgets/menu_home.mp4}
   static const AnimatedIconData menu_home = _$menu_home;
 
   /// The Material Design pause to play icon animation.
+  ///
+  /// {@animation 72 72 https://flutter.github.io/assets-for-api-docs/assets/widgets/pause_play.mp4}
   static const AnimatedIconData pause_play = _$pause_play;
 
   /// The Material Design play to pause icon animation.
+  ///
+  /// {@animation 72 72 https://flutter.github.io/assets-for-api-docs/assets/widgets/play_pause.mp4}
   static const AnimatedIconData play_pause = _$play_pause;
 
   /// The Material Design search to ellipsis icon animation.
+  ///
+  /// {@animation 72 72 https://flutter.github.io/assets-for-api-docs/assets/widgets/search_ellipsis.mp4}
   static const AnimatedIconData search_ellipsis = _$search_ellipsis;
 
   /// The Material Design view to list icon animation.
+  ///
+  /// {@animation 72 72 https://flutter.github.io/assets-for-api-docs/assets/widgets/view_list.mp4}
   static const AnimatedIconData view_list = _$view_list;
 }
 

packages/flutter/lib/src/material/icons.dart

@@ -148,6 +148,7 @@ class PlatformAdaptiveIcons implements Icons {
 ///  * [Icon]
 ///  * [IconButton]
 ///  * <https://material.io/resources/icons>
+///  * [AnimatedIcons], for the list of available animated Material Icons.
 class Icons {
   // This class is not meant to be instantiated or extended; this constructor
   // prevents instantiation and extension.