Revert "Re-land 'Default Keyboard ScrollActions with PrimaryScrollController' (#70401)" (#70675)

This reverts commit 9b56241e.

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

@@ -12,12 +12,6 @@ import 'theme.dart';
 /// The scaffold lays out the navigation bar on top and the content between or
 /// behind the navigation bar.
 ///
-/// When tapping a status bar at the top of the CupertinoPageScaffold, an
-/// animation will complete for the current primary [ScrollView], scrolling to
-/// the beginning. This is done using the [PrimaryScrollController] that
-/// encloses the [ScrollView]. The [ScrollView.primary] flag is used to connect
-/// a [ScrollView] to the enclosing [PrimaryScrollController].
-///
 /// See also:
 ///
 ///  * [CupertinoTabScaffold], a similar widget for tabbed applications.
@@ -81,11 +75,11 @@ class CupertinoPageScaffold extends StatefulWidget {
 }
 
 class _CupertinoPageScaffoldState extends State<CupertinoPageScaffold> {
+  final ScrollController _primaryScrollController = ScrollController();
 
   void _handleStatusBarTap() {
-    final ScrollController? _primaryScrollController = PrimaryScrollController.of(context);
     // Only act on the scroll controller if it has any attached scroll positions.
-    if (_primaryScrollController != null && _primaryScrollController.hasClients) {
+    if (_primaryScrollController.hasClients) {
       _primaryScrollController.animateTo(
         0.0,
         // Eyeballed from iOS.
@@ -169,7 +163,10 @@ class _CupertinoPageScaffoldState extends State<CupertinoPageScaffold> {
       child: Stack(
         children: <Widget>[
           // The main content being at the bottom is added to the stack first.
-          paddedContent,
+          PrimaryScrollController(
+            controller: _primaryScrollController,
+            child: paddedContent,
+          ),
           if (widget.navigationBar != null)
             Positioned(
               top: 0.0,

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

@@ -2670,11 +2670,13 @@ class ScaffoldState extends State<Scaffold> with TickerProviderStateMixin {
   // iOS FEATURES - status bar tap, back gesture
 
   // On iOS, tapping the status bar scrolls the app's primary scrollable to the
-  // top. We implement this by looking up the  primary scroll controller and
+  // top. We implement this by providing a primary scroll controller and
   // scrolling it to the top when tapped.
+
+  final ScrollController _primaryScrollController = ScrollController();
+
   void _handleStatusBarTap() {
-    final ScrollController? _primaryScrollController = PrimaryScrollController.of(context);
-    if (_primaryScrollController != null && _primaryScrollController.hasClients) {
+    if (_primaryScrollController.hasClients) {
       _primaryScrollController.animateTo(
         0.0,
         duration: const Duration(milliseconds: 300),
@@ -3158,27 +3160,30 @@ class ScaffoldState extends State<Scaffold> with TickerProviderStateMixin {
     return _ScaffoldScope(
       hasDrawer: hasDrawer,
       geometryNotifier: _geometryNotifier,
-      child: Material(
-        color: widget.backgroundColor ?? themeData.scaffoldBackgroundColor,
-        child: AnimatedBuilder(animation: _floatingActionButtonMoveController, builder: (BuildContext context, Widget? child) {
-          return CustomMultiChildLayout(
-            children: children,
-            delegate: _ScaffoldLayout(
-              extendBody: _extendBody,
-              extendBodyBehindAppBar: widget.extendBodyBehindAppBar,
-              minInsets: minInsets,
-              minViewPadding: minViewPadding,
-              currentFloatingActionButtonLocation: _floatingActionButtonLocation!,
-              floatingActionButtonMoveAnimationProgress: _floatingActionButtonMoveController.value,
-              floatingActionButtonMotionAnimator: _floatingActionButtonAnimator,
-              geometryNotifier: _geometryNotifier,
-              previousFloatingActionButtonLocation: _previousFloatingActionButtonLocation!,
-              textDirection: textDirection,
-              isSnackBarFloating: isSnackBarFloating,
-              snackBarWidth: snackBarWidth,
-            ),
-          );
-        }),
+      child: PrimaryScrollController(
+        controller: _primaryScrollController,
+        child: Material(
+          color: widget.backgroundColor ?? themeData.scaffoldBackgroundColor,
+          child: AnimatedBuilder(animation: _floatingActionButtonMoveController, builder: (BuildContext context, Widget? child) {
+            return CustomMultiChildLayout(
+              children: children,
+              delegate: _ScaffoldLayout(
+                extendBody: _extendBody,
+                extendBodyBehindAppBar: widget.extendBodyBehindAppBar,
+                minInsets: minInsets,
+                minViewPadding: minViewPadding,
+                currentFloatingActionButtonLocation: _floatingActionButtonLocation!,
+                floatingActionButtonMoveAnimationProgress: _floatingActionButtonMoveController.value,
+                floatingActionButtonMotionAnimator: _floatingActionButtonAnimator,
+                geometryNotifier: _geometryNotifier,
+                previousFloatingActionButtonLocation: _previousFloatingActionButtonLocation!,
+                textDirection: textDirection,
+                isSnackBarFloating: isSnackBarFloating,
+                snackBarWidth: snackBarWidth,
+              ),
+            );
+          }),
+        ),
       ),
     );
   }

packages/flutter/lib/src/widgets/primary_scroll_controller.dart

@@ -16,19 +16,6 @@ import 'scroll_controller.dart';
 /// This mechanism can be used to provide default behavior for scroll views in a
 /// subtree. For example, the [Scaffold] uses this mechanism to implement the
 /// scroll-to-top gesture on iOS.
-///
-/// Another default behavior handled by the PrimaryScrollController is default
-/// [ScrollAction]s. If a ScrollAction is not handled by an otherwise focused
-/// part of the application, the ScrollAction will be evaluated using the scroll
-/// view associated with a PrimaryScrollController, for example, when executing
-/// [Shortcuts] key events like page up and down.
-///
-/// See also:
-///   * [ScrollAction], an [Action] that scrolls the [Scrollable] that encloses
-///     the current [primaryFocus] or is attached to the PrimaryScrollController.
-///   * [Shortcuts], a widget that establishes a [ShortcutManager] to be used
-///     by its descendants when invoking an [Action] via a keyboard key
-///     combination that maps to an [Intent].
 class PrimaryScrollController extends InheritedWidget {
   /// Creates a widget that associates a [ScrollController] with a subtree.
   const PrimaryScrollController({

packages/flutter/lib/src/widgets/routes.dart

@@ -18,9 +18,7 @@ import 'modal_barrier.dart';
 import 'navigator.dart';
 import 'overlay.dart';
 import 'page_storage.dart';
-import 'primary_scroll_controller.dart';
 import 'restoration.dart';
-import 'scroll_controller.dart';
 import 'transitions.dart';
 
 // Examples can assume:
@@ -724,7 +722,6 @@ class _ModalScopeState<T> extends State<_ModalScope<T>> {
 
   /// The node this scope will use for its root [FocusScope] widget.
   final FocusScopeNode focusScopeNode = FocusScopeNode(debugLabel: '$_ModalScopeState Focus Scope');
-  final ScrollController primaryScrollController = ScrollController();
 
   @override
   void initState() {
@@ -805,47 +802,44 @@ class _ModalScopeState<T> extends State<_ModalScope<T>> {
                   actions: <Type, Action<Intent>>{
                     DismissIntent: _DismissModalAction(context),
                   },
-                  child: PrimaryScrollController(
-                    controller: primaryScrollController,
-                    child: FocusScope(
-                      node: focusScopeNode, // immutable
-                      child: RepaintBoundary(
-                        child: AnimatedBuilder(
-                          animation: _listenable, // immutable
-                          builder: (BuildContext context, Widget? child) {
-                            return widget.route.buildTransitions(
-                              context,
-                              widget.route.animation!,
-                              widget.route.secondaryAnimation!,
-                              // This additional AnimatedBuilder is include because if the
-                              // value of the userGestureInProgressNotifier changes, it's
-                              // only necessary to rebuild the IgnorePointer widget and set
-                              // the focus node's ability to focus.
-                              AnimatedBuilder(
-                                animation: widget.route.navigator?.userGestureInProgressNotifier ?? ValueNotifier<bool>(false),
-                                builder: (BuildContext context, Widget? child) {
-                                  final bool ignoreEvents = _shouldIgnoreFocusRequest;
-                                  focusScopeNode.canRequestFocus = !ignoreEvents;
-                                  return IgnorePointer(
-                                    ignoring: ignoreEvents,
-                                    child: child,
-                                  );
-                                },
-                                child: child,
-                              ),
-                            );
-                          },
-                          child: _page ??= RepaintBoundary(
-                            key: widget.route._subtreeKey, // immutable
-                            child: Builder(
-                              builder: (BuildContext context) {
-                                return widget.route.buildPage(
-                                  context,
-                                  widget.route.animation!,
-                                  widget.route.secondaryAnimation!,
+                  child: FocusScope(
+                    node: focusScopeNode, // immutable
+                    child: RepaintBoundary(
+                      child: AnimatedBuilder(
+                        animation: _listenable, // immutable
+                        builder: (BuildContext context, Widget? child) {
+                          return widget.route.buildTransitions(
+                            context,
+                            widget.route.animation!,
+                            widget.route.secondaryAnimation!,
+                            // This additional AnimatedBuilder is include because if the
+                            // value of the userGestureInProgressNotifier changes, it's
+                            // only necessary to rebuild the IgnorePointer widget and set
+                            // the focus node's ability to focus.
+                            AnimatedBuilder(
+                              animation: widget.route.navigator?.userGestureInProgressNotifier ?? ValueNotifier<bool>(false),
+                              builder: (BuildContext context, Widget? child) {
+                                final bool ignoreEvents = _shouldIgnoreFocusRequest;
+                                focusScopeNode.canRequestFocus = !ignoreEvents;
+                                return IgnorePointer(
+                                  ignoring: ignoreEvents,
+                                  child: child,
                                 );
                               },
+                              child: child,
                             ),
+                          );
+                        },
+                        child: _page ??= RepaintBoundary(
+                          key: widget.route._subtreeKey, // immutable
+                          child: Builder(
+                            builder: (BuildContext context) {
+                              return widget.route.buildPage(
+                                context,
+                                widget.route.animation!,
+                                widget.route.secondaryAnimation!,
+                              );
+                            },
                           ),
                         ),
                       ),

packages/flutter/lib/src/widgets/scroll_view.dart

@@ -149,11 +149,6 @@ abstract class ScrollView extends StatelessWidget {
   /// sufficient content to actually scroll. Otherwise, by default the user can
   /// only scroll the view if it has sufficient content. See [physics].
   ///
-  /// Also when true, the scroll view is used for default [ScrollAction]s. If a
-  /// ScrollAction is not handled by an otherwise focused part of the application,
-  /// the ScrollAction will be evaluated using this scroll view, for example,
-  /// when executing [Shortcuts] key events like page up and down.
-  ///
   /// On iOS, this also identifies the scroll view that will scroll to top in
   /// response to a tap in the status bar.
   ///

packages/flutter/lib/src/widgets/scrollable.dart

@@ -17,7 +17,6 @@ import 'focus_manager.dart';
 import 'framework.dart';
 import 'gesture_detector.dart';
 import 'notification_listener.dart';
-import 'primary_scroll_controller.dart';
 import 'restoration.dart';
 import 'restoration_properties.dart';
 import 'scroll_configuration.dart';
@@ -960,10 +959,6 @@ class ScrollIntent extends Intent {
 /// An [Action] that scrolls the [Scrollable] that encloses the current
 /// [primaryFocus] by the amount configured in the [ScrollIntent] given to it.
 ///
-/// If a Scrollable cannot be found above the current [primaryFocus], the
-/// [PrimaryScrollController] will be considered for default handling of
-/// [ScrollAction]s.
-///
 /// If [Scrollable.incrementCalculator] is null for the scrollable, the default
 /// for a [ScrollIntent.type] set to [ScrollIncrementType.page] is 80% of the
 /// size of the scroll window, and for [ScrollIncrementType.line], 50 logical
@@ -972,21 +967,7 @@ class ScrollAction extends Action<ScrollIntent> {
   @override
   bool isEnabled(ScrollIntent intent) {
     final FocusNode? focus = primaryFocus;
-    final bool contextIsValid = focus != null && focus.context != null;
-    if (contextIsValid) {
-      // Check for primary scrollable within the current context
-      if (Scrollable.of(focus!.context!) != null)
-        return true;
-      // Check for fallback scrollable with context from PrimaryScrollController
-      if (PrimaryScrollController.of(focus.context!) != null) {
-        final ScrollController? primaryScrollController = PrimaryScrollController.of(focus.context!);
-        return primaryScrollController != null
-          && primaryScrollController.hasClients
-          && primaryScrollController.position.context.notificationContext != null
-          && Scrollable.of(primaryScrollController.position.context.notificationContext!) != null;
-      }
-    }
-    return false;
+    return focus != null && focus.context != null && Scrollable.of(focus.context!) != null;
   }
 
   // Returns the scroll increment for a single scroll request, for use when
@@ -1070,11 +1051,7 @@ class ScrollAction extends Action<ScrollIntent> {
 
   @override
   void invoke(ScrollIntent intent) {
-    ScrollableState? state = Scrollable.of(primaryFocus!.context!);
-    if (state == null) {
-      final ScrollController? primaryScrollController = PrimaryScrollController.of(primaryFocus!.context!);
-      state = Scrollable.of(primaryScrollController!.position.context.notificationContext!);
-    }
+    final ScrollableState? state = Scrollable.of(primaryFocus!.context!);
     assert(state != null, '$ScrollAction was invoked on a context that has no scrollable parent');
     assert(state!.position.hasPixels, 'Scrollable must be laid out before it can be scrolled via a ScrollAction');
     assert(state!.position.viewportDimension != null);

packages/flutter/lib/src/widgets/shortcuts.dart

@@ -382,7 +382,7 @@ class ShortcutManager extends ChangeNotifier with Diagnosticable {
   }
 }
 
-/// A widget that establishes a [ShortcutManager] to be used by its descendants
+/// A widget that establishes an [ShortcutManager] to be used by its descendants
 /// when invoking an [Action] via a keyboard key combination that maps to an
 /// [Intent].
 ///

packages/flutter/lib/src/widgets/single_child_scroll_view.dart

@@ -270,11 +270,6 @@ class SingleChildScrollView extends StatelessWidget {
   /// Whether this is the primary scroll view associated with the parent
   /// [PrimaryScrollController].
   ///
-  /// When true, the scroll view is used for default [ScrollAction]s. If a
-  /// ScrollAction is not handled by an otherwise focused part of the application,
-  /// the ScrollAction will be evaluated using this scroll view, for example,
-  /// when executing [Shortcuts] key events like page up and down.
-  ///
   /// On iOS, this identifies the scroll view that will scroll to top in
   /// response to a tap in the status bar.
   ///

packages/flutter/test/material/app_bar_test.dart

@@ -19,32 +19,43 @@ Widget buildSliverAppBarApp({
   bool snap = false,
   double toolbarHeight = kToolbarHeight,
 }) {
-  return MaterialApp(
-    home: Scaffold(
-      body: DefaultTabController(
-        length: 3,
-        child: CustomScrollView(
-          primary: true,
-          slivers: <Widget>[
-            SliverAppBar(
-              title: const Text('AppBar Title'),
-              floating: floating,
-              pinned: pinned,
-              collapsedHeight: collapsedHeight,
-              expandedHeight: expandedHeight,
-              toolbarHeight: toolbarHeight,
-              snap: snap,
-              bottom: TabBar(
-                tabs: <String>['A','B','C'].map<Widget>((String t) => Tab(text: 'TAB $t')).toList(),
-              ),
-            ),
-            SliverToBoxAdapter(
-              child: Container(
-                height: 1200.0,
-                color: Colors.orange[400],
-              ),
+  return Localizations(
+    locale: const Locale('en', 'US'),
+    delegates: const <LocalizationsDelegate<dynamic>>[
+      DefaultMaterialLocalizations.delegate,
+      DefaultWidgetsLocalizations.delegate,
+    ],
+    child: Directionality(
+      textDirection: TextDirection.ltr,
+      child: MediaQuery(
+        data: const MediaQueryData(),
+        child: Scaffold(
+          body: DefaultTabController(
+            length: 3,
+            child: CustomScrollView(
+              primary: true,
+              slivers: <Widget>[
+                SliverAppBar(
+                  title: const Text('AppBar Title'),
+                  floating: floating,
+                  pinned: pinned,
+                  collapsedHeight: collapsedHeight,
+                  expandedHeight: expandedHeight,
+                  toolbarHeight: toolbarHeight,
+                  snap: snap,
+                  bottom: TabBar(
+                    tabs: <String>['A','B','C'].map<Widget>((String t) => Tab(text: 'TAB $t')).toList(),
+                  ),
+                ),
+                SliverToBoxAdapter(
+                  child: Container(
+                    height: 1200.0,
+                    color: Colors.orange[400],
+                  ),
+                ),
+              ],
             ),
-          ],
+          ),
         ),
       ),
     ),

packages/flutter/test/material/debug_test.dart

@@ -135,7 +135,6 @@ void main() {
       '     _FocusMarker\n'
       '     Semantics\n'
       '     FocusScope\n'
-      '     PrimaryScrollController\n'
       '     _ActionsMarker\n'
       '     Actions\n'
       '     Builder\n'

packages/flutter/test/material/scaffold_test.dart

@@ -2128,11 +2128,12 @@ void main() {
       '     AnimatedBuilder\n'
       '     DefaultTextStyle\n'
       '     AnimatedDefaultTextStyle\n'
-      '     _InkFeatures-[GlobalKey#00000 ink renderer]\n'
+      '     _InkFeatures-[GlobalKey#342d0 ink renderer]\n'
       '     NotificationListener<LayoutChangedNotification>\n'
       '     PhysicalModel\n'
       '     AnimatedPhysicalModel\n'
       '     Material\n'
+      '     PrimaryScrollController\n'
       '     _ScaffoldScope\n'
       '     Scaffold\n'
       '     MediaQuery\n'

packages/flutter/test/widgets/scroll_view_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/services.dart' show LogicalKeyboardKey;
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter/gestures.dart' show DragStartBehavior;
@@ -1260,48 +1259,4 @@ void main() {
       semanticChildCount: 4,
     ), throwsAssertionError);
   });
-
-  testWidgets('PrimaryScrollController provides fallback ScrollActions', (WidgetTester tester)  async {
-    await tester.pumpWidget(
-      MaterialApp(
-        home: CustomScrollView(
-          primary: true,
-          slivers: List<Widget>.generate(
-            20,
-            (int index) {
-              return SliverToBoxAdapter(
-                child: Focus(
-                  autofocus: index == 0,
-                  child: SizedBox(key: ValueKey<String>('Box $index'), height: 50.0),
-                ),
-              );
-            },
-          ),
-        ),
-      ),
-    );
-    final ScrollController controller = PrimaryScrollController.of(
-      tester.element(find.byType(CustomScrollView))
-    )!;
-    await tester.pumpAndSettle();
-    expect(controller.position.pixels, equals(0.0));
-    expect(
-      tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)),
-      equals(const Rect.fromLTRB(0.0, 0.0, 800.0, 50.0)),
-    );
-    await tester.sendKeyEvent(LogicalKeyboardKey.pageDown);
-    await tester.pumpAndSettle();
-    expect(controller.position.pixels, equals(400.0));
-    expect(
-      tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)),
-      equals(const Rect.fromLTRB(0.0, -400.0, 800.0, -350.0)),
-    );
-    await tester.sendKeyEvent(LogicalKeyboardKey.pageUp);
-    await tester.pumpAndSettle();
-    expect(controller.position.pixels, equals(0.0));
-    expect(
-      tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)),
-      equals(const Rect.fromLTRB(0.0, 0.0, 800.0, 50.0)),
-    );
-  });
 }