Add Dialog.fullscreen and example (#112261)

dev/tools/gen_defaults/bin/gen_defaults.dart

@@ -120,6 +120,7 @@ Future<void> main(List<String> args) async {
   ButtonTemplate('md.comp.text-button', 'TextButton', '$materialLib/text_button.dart', tokens).updateFile();
   CardTemplate('Card', '$materialLib/card.dart', tokens).updateFile();
   CheckboxTemplate('Checkbox', '$materialLib/checkbox.dart', tokens).updateFile();
+  DialogFullscreenTemplate('DialogFullscreen', '$materialLib/dialog.dart', tokens).updateFile();
   DialogTemplate('Dialog', '$materialLib/dialog.dart', tokens).updateFile();
   FABTemplate('FAB', '$materialLib/floating_action_button.dart', tokens).updateFile();
   FilterChipTemplate('ChoiceChip', '$materialLib/choice_chip.dart', tokens).updateFile();

dev/tools/gen_defaults/lib/dialog_template.dart

@@ -47,3 +47,19 @@ class _${blockName}DefaultsM3 extends DialogTheme {
 }
 ''';
 }
+
+class DialogFullscreenTemplate extends TokenTemplate {
+  const DialogFullscreenTemplate(super.blockName, super.fileName, super.tokens);
+
+  @override
+  String generate() => '''
+class _${blockName}DefaultsM3 extends DialogTheme {
+  const _${blockName}DefaultsM3(this.context);
+
+  final BuildContext context;
+
+  @override
+  Color? get backgroundColor => ${componentColor("md.comp.full-screen-dialog.container")};
+}
+''';
+}

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

@@ -0,0 +1,86 @@
+// 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 [Dialog].
+
+import 'package:flutter/material.dart';
+
+void main() => runApp(const MyApp());
+
+class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        appBar: AppBar(title: const Text('Dialog Sample')),
+        body: const Center(
+          child: DialogExample(),
+        ),
+      ),
+    );
+  }
+}
+
+class DialogExample extends StatelessWidget {
+  const DialogExample({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      mainAxisAlignment: MainAxisAlignment.center,
+      children: <Widget>[
+        TextButton(
+          onPressed: () => showDialog<String>(
+            context: context,
+            builder: (BuildContext context) => Dialog(
+              child: Padding(
+                padding: const EdgeInsets.all(8.0),
+                child: Column(
+                  mainAxisSize: MainAxisSize.min,
+                  mainAxisAlignment: MainAxisAlignment.center,
+                  children: <Widget>[
+                   const Text('This is a typical dialog.'),
+                    const SizedBox(height: 15),
+                    TextButton(
+                      onPressed: () {
+                        Navigator.pop(context);
+                      },
+                      child: const Text('Close'),
+                    ),
+                  ],
+                ),
+              ),
+            ),
+          ),
+          child: const Text('Show Dialog'),
+        ),
+        const SizedBox(height: 10),
+        TextButton(
+          onPressed: () => showDialog<String>(
+            context: context,
+            builder: (BuildContext context) => Dialog.fullscreen(
+              child: Column(
+                mainAxisSize: MainAxisSize.min,
+                mainAxisAlignment: MainAxisAlignment.center,
+                children: <Widget>[
+                   const Text('This is a fullscreen dialog.'),
+                  const SizedBox(height: 15),
+                  TextButton(
+                    onPressed: () {
+                      Navigator.pop(context);
+                    },
+                    child: const Text('Close'),
+                  ),
+                ],
+              ),
+            ),
+          ),
+          child: const Text('Show Fullscreen Dialog'),
+        ),
+      ],
+    );
+  }
+}

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

@@ -0,0 +1,53 @@
+// 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/dialog/dialog.0.dart' as example;
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('Show Dialog', (WidgetTester tester) async {
+    const String dialogText = 'This is a typical dialog.';
+
+    await tester.pumpWidget(
+      const MaterialApp(
+        home: Scaffold(
+          body: example.MyApp(),
+        ),
+      ),
+    );
+
+    expect(find.text(dialogText), findsNothing);
+
+    await tester.tap(find.text('Show Dialog'));
+    await tester.pumpAndSettle();
+    expect(find.text(dialogText), findsOneWidget);
+
+    await tester.tap(find.text('Close'));
+    await tester.pumpAndSettle();
+    expect(find.text(dialogText), findsNothing);
+  });
+
+  testWidgets('Show Dialog.fullscreen', (WidgetTester tester) async {
+    const String dialogText = 'This is a fullscreen dialog.';
+
+    await tester.pumpWidget(
+      const MaterialApp(
+        home: Scaffold(
+          body: example.MyApp(),
+        ),
+      ),
+    );
+
+    expect(find.text(dialogText), findsNothing);
+
+    await tester.tap(find.text('Show Fullscreen Dialog'));
+    await tester.pumpAndSettle();
+    expect(find.text(dialogText), findsOneWidget);
+
+    await tester.tap(find.text('Close'));
+    await tester.pumpAndSettle();
+    expect(find.text(dialogText), findsNothing);
+  });
+}

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

@@ -31,6 +31,12 @@ const EdgeInsets _defaultInsetPadding = EdgeInsets.symmetric(horizontal: 40.0, v
 /// or [SimpleDialog], which implement specific kinds of Material Design
 /// dialogs.
 ///
+/// {@tool dartpad}
+/// This sample shows the creation of [Dialog] and [Dialog.fullscreen] widgets.
+///
+/// ** See code in examples/api/lib/material/dialog/dialog.0.dart **
+/// {@end-tool}
+///
 /// See also:
 ///
 ///  * [AlertDialog], for dialogs that have a message and some buttons.
@@ -55,7 +61,26 @@ class Dialog extends StatelessWidget {
     this.alignment,
     this.child,
   }) : assert(clipBehavior != null),
-       assert(elevation == null || elevation >= 0.0);
+       assert(elevation == null || elevation >= 0.0),
+       _fullscreen = false;
+
+  /// Creates a fullscreen dialog.
+  ///
+  /// Typically used in conjunction with [showDialog].
+  const Dialog.fullscreen({
+    super.key,
+    this.backgroundColor,
+    this.insetAnimationDuration = Duration.zero,
+    this.insetAnimationCurve = Curves.decelerate,
+    this.child,
+  }) : elevation = 0,
+       shadowColor = null,
+       surfaceTintColor = null,
+       insetPadding = EdgeInsets.zero,
+       clipBehavior = Clip.none,
+       shape = null,
+       alignment = null,
+       _fullscreen = true;
 
   /// {@template flutter.material.dialog.backgroundColor}
   /// The background color of the surface of this [Dialog].
@@ -130,7 +155,8 @@ class Dialog extends StatelessWidget {
   /// The duration of the animation to show when the system keyboard intrudes
   /// into the space that the dialog is placed in.
   ///
-  /// Defaults to 100 milliseconds.
+  /// Defaults to 100 milliseconds when [Dialog] is used, and [Duration.zero]
+  /// when [Dialog.fullscreen] is used.
   /// {@endtemplate}
   final Duration insetAnimationDuration;
 
@@ -184,13 +210,44 @@ class Dialog extends StatelessWidget {
   /// {@macro flutter.widgets.ProxyWidget.child}
   final Widget? child;
 
+  /// This value is used to determine if this is a fullscreen dialog.
+  final bool _fullscreen;
+
   @override
   Widget build(BuildContext context) {
     final ThemeData theme = Theme.of(context);
     final DialogTheme dialogTheme = DialogTheme.of(context);
-    final DialogTheme defaults = theme.useMaterial3 ? _DialogDefaultsM3(context) : _DialogDefaultsM2(context);
-
     final EdgeInsets effectivePadding = MediaQuery.of(context).viewInsets + (insetPadding ?? EdgeInsets.zero);
+    final DialogTheme defaults = theme.useMaterial3
+      ? (_fullscreen ? _DialogFullscreenDefaultsM3(context) : _DialogDefaultsM3(context))
+      : _DialogDefaultsM2(context);
+
+    Widget dialogChild;
+
+    if (_fullscreen) {
+      dialogChild = Material(
+        color: backgroundColor ?? dialogTheme.backgroundColor ?? defaults.backgroundColor,
+        child: child,
+      );
+    } else {
+      dialogChild = Align(
+        alignment: alignment ?? dialogTheme.alignment ?? defaults.alignment!,
+        child: ConstrainedBox(
+          constraints: const BoxConstraints(minWidth: 280.0),
+          child: Material(
+            color: backgroundColor ?? dialogTheme.backgroundColor ?? Theme.of(context).dialogBackgroundColor,
+            elevation: elevation ?? dialogTheme.elevation ?? defaults.elevation!,
+            shadowColor: shadowColor ?? dialogTheme.shadowColor ?? defaults.shadowColor,
+            surfaceTintColor: surfaceTintColor ?? dialogTheme.surfaceTintColor ?? defaults.surfaceTintColor,
+            shape: shape ?? dialogTheme.shape ?? defaults.shape!,
+            type: MaterialType.card,
+            clipBehavior: clipBehavior,
+            child: child,
+          ),
+        ),
+      );
+    }
+
     return AnimatedPadding(
       padding: effectivePadding,
       duration: insetAnimationDuration,
@@ -201,22 +258,7 @@ class Dialog extends StatelessWidget {
         removeRight: true,
         removeBottom: true,
         context: context,
-        child: Align(
-          alignment: alignment ?? dialogTheme.alignment ?? defaults.alignment!,
-          child: ConstrainedBox(
-            constraints: const BoxConstraints(minWidth: 280.0),
-            child: Material(
-              color: backgroundColor ?? dialogTheme.backgroundColor ?? Theme.of(context).dialogBackgroundColor,
-              elevation: elevation ?? dialogTheme.elevation ?? defaults.elevation!,
-              shadowColor: shadowColor ?? dialogTheme.shadowColor ?? defaults.shadowColor,
-              surfaceTintColor: surfaceTintColor ?? dialogTheme.surfaceTintColor ?? defaults.surfaceTintColor,
-              shape: shape ?? dialogTheme.shape ?? defaults.shape!,
-              type: MaterialType.card,
-              clipBehavior: clipBehavior,
-              child: child,
-            ),
-          ),
-        ),
+        child: dialogChild,
       ),
     );
   }
@@ -1426,3 +1468,23 @@ class _DialogDefaultsM3 extends DialogTheme {
 }
 
 // END GENERATED TOKEN PROPERTIES - Dialog
+
+// BEGIN GENERATED TOKEN PROPERTIES - DialogFullscreen
+
+// 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.
+
+// Token database version: v0_132
+
+class _DialogFullscreenDefaultsM3 extends DialogTheme {
+  const _DialogFullscreenDefaultsM3(this.context);
+
+  final BuildContext context;
+
+  @override
+  Color? get backgroundColor => Theme.of(context).colorScheme.surface;
+}
+
+// END GENERATED TOKEN PROPERTIES - DialogFullscreen

packages/flutter/test/material/dialog_test.dart

@@ -6,6 +6,7 @@ import 'dart:ui';
 
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 import '../widgets/semantics_tester.dart';
@@ -138,6 +139,53 @@ void main() {
     expect(material3Widget.elevation, 6.0);
   });
 
+  testWidgets('Dialog.fullscreen Defaults', (WidgetTester tester) async {
+    const String dialogTextM2 = 'Fullscreen Dialog - M2';
+    const String dialogTextM3 = 'Fullscreen Dialog - M3';
+
+    await tester.pumpWidget(_buildAppWithDialog(
+      theme: material2Theme,
+      const Dialog.fullscreen(
+        child: Text(dialogTextM2),
+      ),
+    ));
+
+    await tester.tap(find.text('X'));
+    await tester.pumpAndSettle();
+
+    expect(find.text(dialogTextM2), findsOneWidget);
+
+    Material materialWidget = _getMaterialFromDialog(tester);
+    expect(materialWidget.color, Colors.grey[800]);
+
+    // Try to dismiss the fullscreen dialog with the escape key.
+    await tester.sendKeyEvent(LogicalKeyboardKey.escape);
+    await tester.pumpAndSettle();
+
+    expect(find.text(dialogTextM2), findsNothing);
+
+    await tester.pumpWidget(_buildAppWithDialog(
+      theme: material3Theme,
+      const Dialog.fullscreen(
+        child: Text(dialogTextM3),
+      ),
+    ));
+
+    await tester.tap(find.text('X'));
+    await tester.pumpAndSettle();
+
+    expect(find.text(dialogTextM3), findsOneWidget);
+
+    materialWidget = _getMaterialFromDialog(tester);
+    expect(materialWidget.color, material3Theme.colorScheme.surface);
+
+    // Try to dismiss the fullscreen dialog with the escape key.
+    await tester.sendKeyEvent(LogicalKeyboardKey.escape);
+    await tester.pumpAndSettle();
+
+    expect(find.text(dialogTextM3), findsNothing);
+  });
+
   testWidgets('Custom dialog elevation', (WidgetTester tester) async {
     const double customElevation = 12.0;
     const Color shadowColor = Color(0xFF000001);