CupertinoAlertDialog: Update sample (#98357)

examples/api/lib/cupertino/dialog/cupertino_alert_dialog.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 CupertinoAlertDialog
+
+import 'package:flutter/cupertino.dart';
+
+void main() => runApp(const MyApp());
+
+class MyApp extends StatelessWidget {
+  const MyApp({Key? key}) : super(key: key);
+
+  static const String _title = 'CupertinoAlertDialog Sample';
+
+  @override
+  Widget build(BuildContext context) {
+    return const CupertinoApp(
+      title: _title,
+      home: ActionSheetSample(title: _title),
+    );
+  }
+}
+
+class ActionSheetSample extends StatelessWidget {
+  const ActionSheetSample({Key? key, required this.title}) : super(key: key);
+
+  final String title;
+
+  // This shows a CupertinoModalPopup which hosts a CupertinoAlertDialog.
+  void _showAlertDialog(BuildContext context) {
+    showCupertinoModalPopup<void>(
+      context: context,
+      builder: (BuildContext context) => CupertinoAlertDialog(
+        title: const Text('Alert'),
+        content: const Text('Proceed with destructive action?'),
+        actions: <CupertinoDialogAction>[
+          CupertinoDialogAction(
+            /// This parameter indicates this action is the default,
+            /// and turns the action's text to bold text.
+            isDefaultAction: true,
+            onPressed: () {
+              Navigator.pop(context);
+            },
+            child: const Text('No'),
+          ),
+          CupertinoDialogAction(
+            /// This parameter indicates the action would perform
+            /// a destructive action such as deletion, and turns
+            /// the action's text color to red.
+            isDestructiveAction: true,
+            onPressed: () {
+              Navigator.pop(context);
+            },
+            child: const Text('Yes'),
+          )
+        ],
+      ),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return CupertinoPageScaffold(
+      navigationBar: CupertinoNavigationBar(
+        middle: Text(title),
+      ),
+      child: Center(
+        child: CupertinoButton(
+          onPressed: () => _showAlertDialog(context),
+          child: const Text('CupertinoAlertDialog'),
+        ),
+      ),
+    );
+  }
+}

examples/api/test/cupertino/dialog/cupertino_alert_dialog.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/cupertino.dart';
+import 'package:flutter_api_samples/cupertino/dialog/cupertino_alert_dialog.0.dart' as example;
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('Perform an action on CupertinoAlertDialog', (WidgetTester tester) async {
+    const String actionText = 'Yes';
+    await tester.pumpWidget(
+      const example.MyApp(),
+    );
+
+    // Launch the CupertinoAlertDialog.
+    await tester.tap(find.byType(CupertinoButton));
+    await tester.pump();
+    await tester.pumpAndSettle();
+    expect(find.text(actionText), findsOneWidget);
+
+    // Tap on an action to close the CupertinoAlertDialog.
+    await tester.tap(find.text(actionText));
+    await tester.pumpAndSettle();
+    expect(find.text(actionText), findsNothing);
+  });
+}

packages/flutter/lib/src/cupertino/dialog.dart

@@ -173,56 +173,12 @@ bool _isInAccessibilityMode(BuildContext context) {
 /// Typically passed as the child widget to [showDialog], which displays the
 /// dialog.
 ///
-/// {@tool snippet}
+/// {@tool dartpad}
 /// This sample shows how to use a [CupertinoAlertDialog].
 ///	The [CupertinoAlertDialog] shows an alert with a set of two choices
 /// when [CupertinoButton] is pressed.
 ///
-/// ```dart
-/// class MyStatefulWidget extends StatefulWidget {
-///   const MyStatefulWidget({Key? key}) : super(key: key);
-///
-///   @override
-///   State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
-/// }
-///
-/// class _MyStatefulWidgetState extends State<MyStatefulWidget> {
-///   @override
-///   Widget build(BuildContext context) {
-///     return CupertinoPageScaffold(
-///       child: Center(
-///         child: CupertinoButton(
-///           onPressed: () {
-///             showCupertinoDialog<void>(
-///               context: context,
-///               builder: (BuildContext context) => CupertinoAlertDialog(
-///                 title: const Text('Alert'),
-///                 content: const Text('Proceed with destructive action?'),
-///                 actions: <CupertinoDialogAction>[
-///                   CupertinoDialogAction(
-///                     child: const Text('No'),
-///                     onPressed: () {
-///                       Navigator.pop(context);
-///                     },
-///                   ),
-///                   CupertinoDialogAction(
-///                     child: const Text('Yes'),
-///                     isDestructiveAction: true,
-///                     onPressed: () {
-///                       // Do something destructive.
-///                     },
-///                   )
-///                 ],
-///               ),
-///             );
-///           },
-///           child: const Text('CupertinoAlertDialog'),
-///         ),
-///       ),
-///     );
-///   }
-/// }
-/// ```
+/// ** See code in examples/api/lib/cupertino/dialog/cupertino_alert_dialog.0.dart **
 /// {@end-tool}
 ///
 /// See also: