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Unverified Commit f4a0511e authored by Kate Lovett's avatar Kate Lovett Committed by GitHub
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Re-land 'Default Keyboard ScrollActions with PrimaryScrollController' (#70893)

parent a76289bb
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Showing with 262 additions and 142 deletions
dev/benchmarks/microbenchmarks/lib/foundation/all_elements_bench.dart
View file @ f4a0511e
......@@ -50,7 +50,7 @@ Future<void> main() async {
print('flutter_test allElements benchmark... (${WidgetsBinding.instance.renderViewElement})');
// Make sure we get enough elements to process for consistent benchmark runs
int elementCount = collectAllElementsFrom(WidgetsBinding.instance.renderViewElement, skipOffstage: false).length;
while (elementCount < 2482) {
while (elementCount < 2458) {
await Future<void>.delayed(Duration.zero);
elementCount = collectAllElementsFrom(WidgetsBinding.instance.renderViewElement, skipOffstage: false).length;
}
......
packages/flutter/lib/src/cupertino/page_scaffold.dart
View file @ f4a0511e
......@@ -12,6 +12,12 @@ 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.
......@@ -75,11 +81,11 @@ 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.hasClients) {
if (_primaryScrollController != null && _primaryScrollController.hasClients) {
_primaryScrollController.animateTo(
0.0,
// Eyeballed from iOS.
......@@ -163,10 +169,7 @@ class _CupertinoPageScaffoldState extends State<CupertinoPageScaffold> {
child: Stack(
children: <Widget>[
// The main content being at the bottom is added to the stack first.
PrimaryScrollController(
controller: _primaryScrollController,
child: paddedContent,
),
paddedContent,
if (widget.navigationBar != null)
Positioned(
top: 0.0,
......
packages/flutter/lib/src/material/scaffold.dart
View file @ f4a0511e
......@@ -2670,13 +2670,11 @@ 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 providing a primary scroll controller and
// top. We implement this by looking up the primary scroll controller and
// scrolling it to the top when tapped.
final ScrollController _primaryScrollController = ScrollController();
void _handleStatusBarTap() {
if (_primaryScrollController.hasClients) {
final ScrollController? _primaryScrollController = PrimaryScrollController.of(context);
if (_primaryScrollController != null && _primaryScrollController.hasClients) {
_primaryScrollController.animateTo(
0.0,
duration: const Duration(milliseconds: 300),
......@@ -3160,30 +3158,27 @@ class ScaffoldState extends State<Scaffold> with TickerProviderStateMixin {
return _ScaffoldScope(
hasDrawer: hasDrawer,
geometryNotifier: _geometryNotifier,
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,
),
);
}),
),
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
View file @ f4a0511e
......@@ -16,6 +16,19 @@ 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
View file @ f4a0511e
......@@ -18,7 +18,9 @@ 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:
......@@ -722,6 +724,7 @@ 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() {
......@@ -802,44 +805,47 @@ class _ModalScopeState<T> extends State<_ModalScope<T>> {
actions: <Type, Action<Intent>>{
DismissIntent: _DismissModalAction(context),
},
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: 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: 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
View file @ f4a0511e
......@@ -149,6 +149,11 @@ 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
View file @ f4a0511e
......@@ -17,6 +17,7 @@ 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';
......@@ -959,6 +960,10 @@ 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
......@@ -967,7 +972,21 @@ class ScrollAction extends Action<ScrollIntent> {
@override
bool isEnabled(ScrollIntent intent) {
final FocusNode? focus = primaryFocus;
return focus != null && focus.context != null && Scrollable.of(focus.context!) != null;
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;
}
// Returns the scroll increment for a single scroll request, for use when
......@@ -1051,7 +1070,11 @@ class ScrollAction extends Action<ScrollIntent> {
@override
void invoke(ScrollIntent intent) {
final ScrollableState? state = Scrollable.of(primaryFocus!.context!);
ScrollableState? state = Scrollable.of(primaryFocus!.context!);
if (state == null) {
final ScrollController? primaryScrollController = PrimaryScrollController.of(primaryFocus!.context!);
state = Scrollable.of(primaryScrollController!.position.context.notificationContext!);
}
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
View file @ f4a0511e
......@@ -382,7 +382,7 @@ class ShortcutManager extends ChangeNotifier with Diagnosticable {
}
}
/// A widget that establishes an [ShortcutManager] to be used by its descendants
/// 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].
///
......
packages/flutter/lib/src/widgets/single_child_scroll_view.dart
View file @ f4a0511e
......@@ -270,6 +270,11 @@ 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
View file @ f4a0511e
......@@ -19,43 +19,32 @@ Widget buildSliverAppBarApp({
bool snap = false,
double toolbarHeight = kToolbarHeight,
}) {
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],
),
),
],
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],
),
),
],
),
),
),
......
packages/flutter/test/material/debug_test.dart
View file @ f4a0511e
......@@ -135,6 +135,7 @@ void main() {
' _FocusMarker\n'
' Semantics\n'
' FocusScope\n'
' PrimaryScrollController\n'
' _ActionsMarker\n'
' Actions\n'
' Builder\n'
......
packages/flutter/test/material/scaffold_test.dart
View file @ f4a0511e
......@@ -2128,12 +2128,11 @@ void main() {
' AnimatedBuilder\n'
' DefaultTextStyle\n'
' AnimatedDefaultTextStyle\n'
' _InkFeatures-[GlobalKey#342d0 ink renderer]\n'
' _InkFeatures-[GlobalKey#00000 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
View file @ f4a0511e
......@@ -2,6 +2,7 @@
// 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;
......@@ -1259,4 +1260,48 @@ 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)),
);
});
}
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