Add `useSafeArea` parameter to `showModalBottomSheet` (#107140)

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

@@ -470,6 +470,7 @@ class _ModalBottomSheetRoute<T> extends PopupRoute<T> {
     super.settings,
     this.transitionAnimationController,
     this.anchorPoint,
+    this.useSafeArea = false,
   }) : assert(isScrollControlled != null),
        assert(isDismissible != null),
        assert(enableDrag != null);
@@ -487,6 +488,7 @@ class _ModalBottomSheetRoute<T> extends PopupRoute<T> {
   final bool enableDrag;
   final AnimationController? transitionAnimationController;
   final Offset? anchorPoint;
+  final bool useSafeArea;
 
   @override
   Duration get transitionDuration => _bottomSheetEnterDuration;
@@ -519,12 +521,7 @@ class _ModalBottomSheetRoute<T> extends PopupRoute<T> {
 
   @override
   Widget buildPage(BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation) {
-    // By definition, the bottom sheet is aligned to the bottom of the page
-    // and isn't exposed to the top padding of the MediaQuery.
-    final Widget bottomSheet = MediaQuery.removePadding(
-      context: context,
-      removeTop: true,
-      child: DisplayFeatureSubScreen(
+    final Widget content = DisplayFeatureSubScreen(
       anchorPoint: anchorPoint,
       child: Builder(
         builder: (BuildContext context) {
@@ -541,8 +538,19 @@ class _ModalBottomSheetRoute<T> extends PopupRoute<T> {
           );
         },
       ),
-      ),
     );
+
+    // If useSafeArea is true, a SafeArea is inserted.
+    // If useSafeArea is false, the bottom sheet is aligned to the bottom of the page
+    // and isn't exposed to the top padding of the MediaQuery.
+    final Widget bottomSheet = useSafeArea
+      ? SafeArea(child: content)
+      : MediaQuery.removePadding(
+          context: context,
+          removeTop: true,
+          child: content,
+        );
+
     return capturedThemes.wrap(bottomSheet);
   }
 }
@@ -638,6 +646,9 @@ class _BottomSheetSuspendedCurve extends ParametricCurve<double> {
 /// The [enableDrag] parameter specifies whether the bottom sheet can be
 /// dragged up and down and dismissed by swiping downwards.
 ///
+/// The [useSafeArea] parameter specifies whether a SafeArea is inserted. Defaults to false.
+/// If false, no SafeArea is added and the top padding is consumed using MediaQuery.removePadding.
+///
 /// The optional [backgroundColor], [elevation], [shape], [clipBehavior],
 /// [constraints] and [transitionAnimationController]
 /// parameters can be passed in to customize the appearance and behavior of
@@ -690,6 +701,7 @@ Future<T?> showModalBottomSheet<T>({
   bool useRootNavigator = false,
   bool isDismissible = true,
   bool enableDrag = true,
+  bool useSafeArea = false,
   RouteSettings? routeSettings,
   AnimationController? transitionAnimationController,
   Offset? anchorPoint,
@@ -720,6 +732,7 @@ Future<T?> showModalBottomSheet<T>({
     settings: routeSettings,
     transitionAnimationController: transitionAnimationController,
     anchorPoint: anchorPoint,
+    useSafeArea: useSafeArea,
   ));
 }
 

packages/flutter/test/material/bottom_sheet_test.dart

@@ -681,6 +681,69 @@ void main() {
     );
   });
 
+  testWidgets('modal BottomSheet can insert a SafeArea', (WidgetTester tester) async {
+    late BuildContext outerContext;
+    late BuildContext innerContext;
+
+    await tester.pumpWidget(Localizations(
+      locale: const Locale('en', 'US'),
+      delegates: const <LocalizationsDelegate<dynamic>>[
+        DefaultWidgetsLocalizations.delegate,
+        DefaultMaterialLocalizations.delegate,
+      ],
+      child: Directionality(
+        textDirection: TextDirection.ltr,
+        child: MediaQuery(
+          data: const MediaQueryData(
+            padding: EdgeInsets.all(50.0),
+            size: Size(400.0, 600.0),
+          ),
+          child: Navigator(
+            onGenerateRoute: (_) {
+              return PageRouteBuilder<void>(
+                pageBuilder: (BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation) {
+                  outerContext = context;
+                  return Container();
+                },
+              );
+            },
+          ),
+        ),
+      ),
+    ));
+
+    // Without a SafeArea (useSafeArea is false by default)
+    showModalBottomSheet<void>(
+      context: outerContext,
+      builder: (BuildContext context) {
+        innerContext = context;
+        return Container();
+      },
+    );
+    await tester.pump();
+    await tester.pump(const Duration(seconds: 1));
+
+    // Top padding is consumed and there is no SafeArea
+    expect(MediaQuery.of(innerContext).padding.top, 0);
+    expect(find.byType(SafeArea), findsNothing);
+
+    // With a SafeArea
+    showModalBottomSheet<void>(
+      context: outerContext,
+      useSafeArea: true,
+      builder: (BuildContext context) {
+        innerContext = context;
+        return Container();
+      },
+    );
+    await tester.pump();
+    await tester.pump(const Duration(seconds: 1));
+
+    // Top padding is consumed and there is a SafeArea
+    expect(MediaQuery.of(innerContext).padding.top, 0);
+    expect(find.byType(SafeArea), findsOneWidget);
+  });
+
   testWidgets('modal BottomSheet has semantics', (WidgetTester tester) async {
     final SemanticsTester semantics = SemanticsTester(tester);
     final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();