SimpleDialogOption: support custom padding (#50035)

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

@@ -540,6 +540,7 @@ class SimpleDialogOption extends StatelessWidget {
   const SimpleDialogOption({
     Key key,
     this.onPressed,
+    this.padding,
     this.child,
   }) : super(key: key);
 
@@ -556,12 +557,17 @@ class SimpleDialogOption extends StatelessWidget {
   /// Typically a [Text] widget.
   final Widget child;
 
+  /// The amount of space to surround the [child] with.
+  ///
+  /// Defaults to EdgeInsets.symmetric(vertical: 8.0, horizontal: 24.0).
+  final EdgeInsets padding;
+
   @override
   Widget build(BuildContext context) {
     return InkWell(
       onTap: onPressed,
       child: Padding(
-        padding: const EdgeInsets.symmetric(vertical: 8.0, horizontal: 24.0),
+        padding: padding ?? const EdgeInsets.symmetric(vertical: 8.0, horizontal: 24.0),
         child: child,
       ),
     );

packages/flutter/test/material/dialog_test.dart

@@ -11,7 +11,7 @@ import 'package:matcher/matcher.dart';
 
 import '../widgets/semantics_tester.dart';
 
-MaterialApp _appWithAlertDialog(WidgetTester tester, AlertDialog dialog, { ThemeData theme }) {
+MaterialApp _buildAppWithDialog(Widget dialog, { ThemeData theme }) {
   return MaterialApp(
     theme: theme,
     home: Material(
@@ -64,7 +64,7 @@ void main() {
         ),
       ],
     );
-    await tester.pumpWidget(_appWithAlertDialog(tester, dialog));
+    await tester.pumpWidget(_buildAppWithDialog(dialog));
 
     await tester.tap(find.text('X'));
     await tester.pumpAndSettle();
@@ -80,7 +80,7 @@ void main() {
       backgroundColor: customColor,
       actions: <Widget>[ ],
     );
-    await tester.pumpWidget(_appWithAlertDialog(tester, dialog, theme: ThemeData(brightness: Brightness.dark)));
+    await tester.pumpWidget(_buildAppWithDialog(dialog, theme: ThemeData(brightness: Brightness.dark)));
 
     await tester.tap(find.text('X'));
     await tester.pumpAndSettle();
@@ -95,7 +95,7 @@ void main() {
       content: Text('Y'),
       actions: <Widget>[ ],
     );
-    await tester.pumpWidget(_appWithAlertDialog(tester, dialog, theme: ThemeData(brightness: Brightness.dark)));
+    await tester.pumpWidget(_buildAppWithDialog(dialog, theme: ThemeData(brightness: Brightness.dark)));
 
     await tester.tap(find.text('X'));
     await tester.pumpAndSettle();
@@ -112,7 +112,7 @@ void main() {
       actions: <Widget>[ ],
       elevation: customElevation,
     );
-    await tester.pumpWidget(_appWithAlertDialog(tester, dialog));
+    await tester.pumpWidget(_buildAppWithDialog(dialog));
 
     await tester.tap(find.text('X'));
     await tester.pumpAndSettle();
@@ -129,7 +129,7 @@ void main() {
       titleTextStyle: titleTextStyle,
       actions: <Widget>[ ],
     );
-    await tester.pumpWidget(_appWithAlertDialog(tester, dialog));
+    await tester.pumpWidget(_buildAppWithDialog(dialog));
 
     await tester.tap(find.text('X'));
     await tester.pumpAndSettle();
@@ -146,7 +146,7 @@ void main() {
       contentTextStyle: contentTextStyle,
       actions: <Widget>[ ],
     );
-    await tester.pumpWidget(_appWithAlertDialog(tester, dialog));
+    await tester.pumpWidget(_buildAppWithDialog(dialog));
 
     await tester.tap(find.text('X'));
     await tester.pumpAndSettle();
@@ -162,7 +162,7 @@ void main() {
       actions: <Widget>[ ],
       shape: customBorder,
     );
-    await tester.pumpWidget(_appWithAlertDialog(tester, dialog));
+    await tester.pumpWidget(_buildAppWithDialog(dialog));
 
     await tester.tap(find.text('X'));
     await tester.pumpAndSettle();
@@ -176,7 +176,7 @@ void main() {
       actions: <Widget>[ ],
       shape: null,
     );
-    await tester.pumpWidget(_appWithAlertDialog(tester, dialog));
+    await tester.pumpWidget(_buildAppWithDialog(dialog));
 
     await tester.tap(find.text('X'));
     await tester.pumpAndSettle();
@@ -191,7 +191,7 @@ void main() {
       actions: <Widget>[ ],
       shape: customBorder,
     );
-    await tester.pumpWidget(_appWithAlertDialog(tester, dialog));
+    await tester.pumpWidget(_buildAppWithDialog(dialog));
 
     await tester.tap(find.text('X'));
     await tester.pumpAndSettle();
@@ -243,6 +243,32 @@ void main() {
     expect(await result, equals(42));
   });
 
+  testWidgets('Custom padding on SimpleDialogOption', (WidgetTester tester) async {
+    const EdgeInsets customPadding = EdgeInsets.fromLTRB(4, 10, 8, 6);
+    final SimpleDialog dialog = SimpleDialog(
+      title: const Text('Title'),
+      children: <Widget>[
+        SimpleDialogOption(
+          onPressed: () {},
+          child: const Text('First option'),
+          padding: customPadding,
+        ),
+      ],
+    );
+
+    await tester.pumpWidget(_buildAppWithDialog(dialog));
+    await tester.tap(find.text('X'));
+    await tester.pumpAndSettle();
+
+    final Rect dialogRect = tester.getRect(find.byType(SimpleDialogOption));
+    final Rect textRect = tester.getRect(find.text('First option'));
+
+    expect(textRect.left, dialogRect.left + customPadding.left);
+    expect(textRect.top, dialogRect.top + customPadding.top);
+    expect(textRect.right, dialogRect.right - customPadding.right);
+    expect(textRect.bottom, dialogRect.bottom - customPadding.bottom);
+  });
+
   testWidgets('Barrier dismissible', (WidgetTester tester) async {
     await tester.pumpWidget(
       const MaterialApp(
@@ -353,7 +379,7 @@ void main() {
     );
 
     await tester.pumpWidget(
-      _appWithAlertDialog(tester, dialog),
+      _buildAppWithDialog(dialog),
     );
 
     await tester.tap(find.text('X'));
@@ -387,7 +413,7 @@ void main() {
     );
 
     await tester.pumpWidget(
-      _appWithAlertDialog(tester, dialog),
+      _buildAppWithDialog(dialog),
     );
 
     await tester.tap(find.text('X'));
@@ -429,7 +455,7 @@ void main() {
     );
 
     await tester.pumpWidget(
-      _appWithAlertDialog(tester, dialog),
+      _buildAppWithDialog(dialog),
     );
 
     await tester.tap(find.text('X'));
@@ -493,7 +519,7 @@ void main() {
     );
 
     await tester.pumpWidget(
-      _appWithAlertDialog(tester, dialog),
+      _buildAppWithDialog(dialog),
     );
 
     await tester.tap(find.text('X'));
@@ -554,7 +580,7 @@ void main() {
     );
 
     await tester.pumpWidget(
-      _appWithAlertDialog(tester, dialog),
+      _buildAppWithDialog(dialog),
     );
 
     await tester.tap(find.text('X'));
@@ -954,7 +980,7 @@ void main() {
         ),
         scrollable: true,
       );
-      await tester.pumpWidget(_appWithAlertDialog(tester, dialog));
+      await tester.pumpWidget(_buildAppWithDialog(dialog));
       await tester.tap(find.text('X'));
       await tester.pumpAndSettle();
 
@@ -974,7 +1000,7 @@ void main() {
         ),
         scrollable: true,
       );
-      await tester.pumpWidget(_appWithAlertDialog(tester, dialog));
+      await tester.pumpWidget(_buildAppWithDialog(dialog));
       await tester.tap(find.text('X'));
       await tester.pumpAndSettle();
 
@@ -1000,7 +1026,7 @@ void main() {
         ),
         scrollable: true,
       );
-      await tester.pumpWidget(_appWithAlertDialog(tester, dialog));
+      await tester.pumpWidget(_buildAppWithDialog(dialog));
       await tester.tap(find.text('X'));
       await tester.pumpAndSettle();