Remove long-deprecated TwoLevelList (#26238)

examples/flutter_gallery/lib/demo/material/expansion_tile_list_demo.dart

@@ -6,8 +6,8 @@ import 'package:flutter/material.dart';
 
 import '../../gallery/demo.dart';
 
-class TwoLevelListDemo extends StatelessWidget {
+class ExpansionTileListDemo extends StatelessWidget {
-  static const String routeName = '/material/two-level-list';
+  static const String routeName = '/material/expansion-tile-list';
 
   @override
   Widget build(BuildContext context) {

examples/flutter_gallery/lib/demo/material/material.dart

@@ -14,6 +14,7 @@ export 'dialog_demo.dart';
 export 'drawer_demo.dart';
 export 'elevation_demo.dart';
 export 'expansion_panels_demo.dart';
+export 'expansion_tile_list_demo.dart';
 export 'grid_list_demo.dart';
 export 'icons_demo.dart';
 export 'leave_behind_demo.dart';
@@ -34,4 +35,3 @@ export 'tabs_demo.dart';
 export 'tabs_fab_demo.dart';
 export 'text_form_field_demo.dart';
 export 'tooltip_demo.dart';
-export 'two_level_list_demo.dart';

examples/flutter_gallery/lib/gallery/demos.dart

@@ -243,9 +243,9 @@ List<GalleryDemo> _buildGalleryDemos() {
       subtitle: 'A list with one sub-list level',
       icon: GalleryIcons.expand_all,
       category: _kMaterialComponents,
-      routeName: TwoLevelListDemo.routeName,
+      routeName: ExpansionTileListDemo.routeName,
       documentationUrl: 'https://docs.flutter.io/flutter/material/ExpansionTile-class.html',
-      buildRoute: (BuildContext context) => TwoLevelListDemo(),
+      buildRoute: (BuildContext context) => ExpansionTileListDemo(),
     ),
     GalleryDemo(
       title: 'Expansion panels',

examples/flutter_gallery/test/accessibility_test.dart

@@ -229,9 +229,9 @@ void main() {
       handle.dispose();
     });
 
-    testWidgets('two_level_list_demo', (WidgetTester tester) async {
+    testWidgets('expansion_tile_list_demo', (WidgetTester tester) async {
       final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: TwoLevelListDemo()));
+      await tester.pumpWidget(MaterialApp(home: ExpansionTileListDemo()));
       await expectLater(tester, meetsGuideline(androidTapTargetGuideline));
       handle.dispose();
     });
@@ -462,9 +462,9 @@ void main() {
       handle.dispose();
     });
 
-    testWidgets('two_level_list_demo', (WidgetTester tester) async {
+    testWidgets('expansion_tile_list_demo', (WidgetTester tester) async {
       final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: TwoLevelListDemo()));
+      await tester.pumpWidget(MaterialApp(home: ExpansionTileListDemo()));
       await expectLater(tester, meetsGuideline(labeledTapTargetGuideline));
       handle.dispose();
     });
@@ -775,11 +775,11 @@ void main() {
         handle.dispose();
       });
 
-      testWidgets('two_level_list_demo $themeName', (WidgetTester tester) async {
+      testWidgets('expansion_tile_list_demo $themeName', (WidgetTester tester) async {
         final AutomatedTestWidgetsFlutterBinding binding = tester.binding;
         binding.addTime(const Duration(seconds: 3));
         final SemanticsHandle handle = tester.ensureSemantics();
-        await tester.pumpWidget(MaterialApp(theme: theme, home: TwoLevelListDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: ExpansionTileListDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });

packages/flutter/lib/material.dart

@@ -105,7 +105,6 @@ export 'src/material/time.dart';
 export 'src/material/time_picker.dart';
 export 'src/material/toggleable.dart';
 export 'src/material/tooltip.dart';
-export 'src/material/two_level_list.dart';
 export 'src/material/typography.dart';
 export 'src/material/user_accounts_drawer_header.dart';
 export 'widgets.dart';

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

@@ -1,288 +0,0 @@
-// Copyright 2016 The Chromium 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/widgets.dart';
-
-import 'colors.dart';
-import 'icons.dart';
-import 'list_tile.dart';
-import 'theme.dart';
-import 'theme_data.dart';
-
-/// This enum is deprecated. Please use [ListTileTheme] instead.
-enum MaterialListType {
-  /// A list tile that contains a single line of text.
-  oneLine,
-
-  /// A list tile that contains a [CircleAvatar] followed by a single line of text.
-  oneLineWithAvatar,
-
-  /// A list tile that contains two lines of text.
-  twoLine,
-
-  /// A list tile that contains three lines of text.
-  threeLine,
-}
-
-/// This constant is deprecated. The [ListTile] class sizes itself based on
-/// its content and [ListTileTheme].
-@deprecated
-Map<MaterialListType, double> kListTileExtent = const <MaterialListType, double>{
-  MaterialListType.oneLine: 48.0,
-  MaterialListType.oneLineWithAvatar: 56.0,
-  MaterialListType.twoLine: 72.0,
-  MaterialListType.threeLine: 88.0,
-};
-
-const Duration _kExpand = Duration(milliseconds: 200);
-
-/// This class is deprecated. Please use [ListTile] instead.
-@deprecated
-class TwoLevelListItem extends StatelessWidget {
-  /// Creates an item in a two-level list.
-  const TwoLevelListItem({
-    Key key,
-    this.leading,
-    @required this.title,
-    this.trailing,
-    this.enabled = true,
-    this.onTap,
-    this.onLongPress
-  }) : assert(title != null),
-       super(key: key);
-
-  /// A widget to display before the title.
-  ///
-  /// Typically a [CircleAvatar] widget.
-  final Widget leading;
-
-  /// The primary content of the list item.
-  ///
-  /// Typically a [Text] widget.
-  final Widget title;
-
-  /// A widget to display after the title.
-  ///
-  /// Typically an [Icon] widget.
-  final Widget trailing;
-
-  /// Whether this list item is interactive.
-  ///
-  /// If false, this list item is styled with the disabled color from the
-  /// current [Theme] and the [onTap] and [onLongPress] callbacks are
-  /// inoperative.
-  final bool enabled;
-
-  /// Called when the user taps this list item.
-  ///
-  /// Inoperative if [enabled] is false.
-  final GestureTapCallback onTap;
-
-  /// Called when the user long-presses on this list item.
-  ///
-  /// Inoperative if [enabled] is false.
-  final GestureLongPressCallback onLongPress;
-
-  @override
-  Widget build(BuildContext context) {
-    final TwoLevelList parentList = context.ancestorWidgetOfExactType(TwoLevelList);
-    assert(parentList != null);
-
-    return SizedBox(
-      height: kListTileExtent[parentList.type],
-      child: ListTile(
-        leading: leading,
-        title: title,
-        trailing: trailing,
-        enabled: enabled,
-        onTap: onTap,
-        onLongPress: onLongPress
-      )
-    );
-  }
-}
-
-/// This class is deprecated. Please use [ExpansionTile] instead.
-@deprecated
-class TwoLevelSublist extends StatefulWidget {
-  /// Creates an item in a two-level list that can expand and collapse.
-  const TwoLevelSublist({
-    Key key,
-    this.leading,
-    @required this.title,
-    this.backgroundColor,
-    this.onOpenChanged,
-    this.children = const <Widget>[],
-  }) : super(key: key);
-
-  /// A widget to display before the title.
-  ///
-  /// Typically a [CircleAvatar] widget.
-  final Widget leading;
-
-  /// The primary content of the list item.
-  ///
-  /// Typically a [Text] widget.
-  final Widget title;
-
-  /// Called when the sublist expands or collapses.
-  ///
-  /// When the sublist starts expanding, this function is called with the value
-  /// true. When the sublist starts collapsing, this function is called with
-  /// the value false.
-  final ValueChanged<bool> onOpenChanged;
-
-  /// The widgets that are displayed when the sublist expands.
-  ///
-  /// Typically [TwoLevelListItem] widgets.
-  final List<Widget> children;
-
-  /// The color to display behind the sublist when expanded.
-  final Color backgroundColor;
-
-  @override
-  _TwoLevelSublistState createState() => _TwoLevelSublistState();
-}
-
-@deprecated
-class _TwoLevelSublistState extends State<TwoLevelSublist> with SingleTickerProviderStateMixin {
-  AnimationController _controller;
-  CurvedAnimation _easeOutAnimation;
-  CurvedAnimation _easeInAnimation;
-  ColorTween _borderColor;
-  ColorTween _headerColor;
-  ColorTween _iconColor;
-  ColorTween _backgroundColor;
-  Animation<double> _iconTurns;
-
-  bool _isExpanded = false;
-
-  @override
-  void initState() {
-    super.initState();
-    _controller = AnimationController(duration: _kExpand, vsync: this);
-    _easeOutAnimation = CurvedAnimation(parent: _controller, curve: Curves.easeOut);
-    _easeInAnimation = CurvedAnimation(parent: _controller, curve: Curves.easeIn);
-    _borderColor = ColorTween(begin: Colors.transparent);
-    _headerColor = ColorTween();
-    _iconColor = ColorTween();
-    _iconTurns = Tween<double>(begin: 0.0, end: 0.5).animate(_easeInAnimation);
-    _backgroundColor = ColorTween();
-
-    _isExpanded = PageStorage.of(context)?.readState(context) ?? false;
-    if (_isExpanded)
-      _controller.value = 1.0;
-  }
-
-  @override
-  void dispose() {
-    _controller.dispose();
-    super.dispose();
-  }
-
-  void _handleOnTap() {
-    setState(() {
-      _isExpanded = !_isExpanded;
-      if (_isExpanded)
-        _controller.forward();
-      else
-        _controller.reverse();
-      PageStorage.of(context)?.writeState(context, _isExpanded);
-    });
-    if (widget.onOpenChanged != null)
-      widget.onOpenChanged(_isExpanded);
-  }
-
-  Widget buildList(BuildContext context, Widget child) {
-    return Container(
-      decoration: BoxDecoration(
-        color: _backgroundColor.evaluate(_easeOutAnimation),
-        border: Border(
-          top: BorderSide(color: _borderColor.evaluate(_easeOutAnimation)),
-          bottom: BorderSide(color: _borderColor.evaluate(_easeOutAnimation))
-        )
-      ),
-      child: Column(
-        children: <Widget>[
-          IconTheme.merge(
-            data: IconThemeData(color: _iconColor.evaluate(_easeInAnimation)),
-            child: TwoLevelListItem(
-              onTap: _handleOnTap,
-              leading: widget.leading,
-              title: DefaultTextStyle(
-                style: Theme.of(context).textTheme.subhead.copyWith(color: _headerColor.evaluate(_easeInAnimation)),
-                child: widget.title
-              ),
-              trailing: RotationTransition(
-                turns: _iconTurns,
-                child: const Icon(Icons.expand_more)
-              )
-            )
-          ),
-          ClipRect(
-            child: Align(
-              heightFactor: _easeInAnimation.value,
-              child: Column(children: widget.children)
-            )
-          )
-        ]
-      )
-    );
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    final ThemeData theme = Theme.of(context);
-    _borderColor.end = theme.dividerColor;
-    _headerColor
-      ..begin = theme.textTheme.subhead.color
-      ..end = theme.accentColor;
-    _iconColor
-      ..begin = theme.unselectedWidgetColor
-      ..end = theme.accentColor;
-    _backgroundColor
-      ..begin = Colors.transparent
-      ..end = widget.backgroundColor ?? Colors.transparent;
-
-    return AnimatedBuilder(
-      animation: _controller.view,
-      builder: buildList
-    );
-  }
-}
-
-/// This class is deprecated. Please use [ListView] and [ListTileTheme] instead.
-@deprecated
-class TwoLevelList extends StatelessWidget {
-  /// Creates a scrollable list of items that can expand and collapse.
-  ///
-  /// The [type] argument must not be null.
-  const TwoLevelList({
-    Key key,
-    this.children = const <Widget>[],
-    this.type = MaterialListType.twoLine,
-    this.padding,
-  }) : assert(type != null),
-       super(key: key);
-
-  /// The widgets to display in this list.
-  ///
-  /// Typically [TwoLevelListItem] or [TwoLevelSublist] widgets.
-  final List<Widget> children;
-
-  /// The kind of [ListTile] contained in this list.
-  final MaterialListType type;
-
-  /// The amount of space by which to inset the children inside the viewport.
-  final EdgeInsetsGeometry padding;
-
-  @override
-  Widget build(BuildContext context) {
-    return ListView(
-      padding: padding,
-      shrinkWrap: true,
-      children: KeyedSubtree.ensureUniqueKeysForList(children),
-    );
-  }
-}

packages/flutter/test/material/two_level_list_test.dart

@@ -1,135 +0,0 @@
-// Copyright 2016 The Chromium 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_test/flutter_test.dart';
-import 'package:flutter/widgets.dart';
-import 'package:flutter/material.dart';
-
-void main() {
-  testWidgets('TwoLevelList basics', (WidgetTester tester) async {
-    final Key topKey = UniqueKey();
-    final Key sublistKey = UniqueKey();
-    final Key bottomKey = UniqueKey();
-
-    final Map<String, WidgetBuilder> routes = <String, WidgetBuilder>{
-      '/': (_) {
-        return Material(
-          child: SingleChildScrollView(
-            child: Column(
-              children: <Widget>[
-                ListTile(title: const Text('Top'), key: topKey),
-                ExpansionTile(
-                  key: sublistKey,
-                  title: const Text('Sublist'),
-                  children: const <Widget>[
-                    ListTile(title: Text('0')),
-                    ListTile(title: Text('1'))
-                  ]
-                ),
-                ListTile(title: const Text('Bottom'), key: bottomKey)
-              ]
-            )
-          )
-        );
-      }
-    };
-
-    await tester.pumpWidget(MaterialApp(routes: routes));
-
-    expect(find.text('Top'), findsOneWidget);
-    expect(find.text('Sublist'), findsOneWidget);
-    expect(find.text('Bottom'), findsOneWidget);
-
-    double getY(Key key) => tester.getTopLeft(find.byKey(key)).dy;
-    double getHeight(Key key) => tester.getSize(find.byKey(key)).height;
-
-    expect(getY(topKey), lessThan(getY(sublistKey)));
-    expect(getY(sublistKey), lessThan(getY(bottomKey)));
-
-    // The sublist has a one pixel border above and below.
-    expect(getHeight(topKey), equals(getHeight(sublistKey) - 2.0));
-    expect(getHeight(bottomKey), equals(getHeight(sublistKey) - 2.0));
-
-    await tester.tap(find.text('Sublist'));
-    await tester.pump(const Duration(seconds: 1));
-    await tester.pump(const Duration(seconds: 1));
-
-    expect(find.text('Top'), findsOneWidget);
-    expect(find.text('Sublist'), findsOneWidget);
-    expect(find.text('0'), findsOneWidget);
-    expect(find.text('1'), findsOneWidget);
-    expect(find.text('Bottom'), findsOneWidget);
-
-    expect(getY(topKey), lessThan(getY(sublistKey)));
-    expect(getY(sublistKey), lessThan(getY(bottomKey)));
-    expect(getY(bottomKey) - getY(sublistKey), greaterThan(getHeight(topKey)));
-    expect(getY(bottomKey) - getY(sublistKey), greaterThan(getHeight(bottomKey)));
-  });
-
-  testWidgets('onExpansionChanged callback', (WidgetTester tester) async {
-    bool didChangeOpen;
-
-    final Map<String, WidgetBuilder> routes = <String, WidgetBuilder>{
-      '/': (_) {
-        return Material(
-          child: SingleChildScrollView(
-            child: Column(
-              children: <Widget>[
-                ExpansionTile(
-                  title: const Text('Sublist'),
-                  onExpansionChanged: (bool opened) {
-                    didChangeOpen = opened;
-                  },
-                  children: const <Widget>[
-                    ListTile(title: Text('0')),
-                    ListTile(title: Text('1'))
-                  ]
-                ),
-              ]
-            )
-          )
-        );
-      }
-    };
-
-    await tester.pumpWidget(MaterialApp(routes: routes));
-
-    expect(didChangeOpen, isNull);
-    await tester.tap(find.text('Sublist'));
-    expect(didChangeOpen, isTrue);
-    await tester.pump();
-    await tester.pump(const Duration(seconds: 1));
-    await tester.tap(find.text('Sublist'));
-    expect(didChangeOpen, isFalse);
-  });
-
-  testWidgets('trailing override', (WidgetTester tester) async {
-    final Map<String, WidgetBuilder> routes = <String, WidgetBuilder>{
-      '/': (_) {
-        return Material(
-          child: SingleChildScrollView(
-            child: Column(
-              children: const <Widget>[
-                ListTile(title: Text('Top')),
-                ExpansionTile(
-                  title: Text('Sublist'),
-                  children: <Widget>[
-                    ListTile(title: Text('0')),
-                    ListTile(title: Text('1'))
-                  ],
-                  trailing: Icon(Icons.inbox),
-                ),
-                ListTile(title: Text('Bottom'))
-              ]
-            )
-          )
-        );
-      }
-    };
-
-    await tester.pumpWidget(MaterialApp(routes: routes));
-    expect(find.byIcon(Icons.inbox), findsOneWidget);
-    expect(find.byIcon(Icons.expand_more), findsNothing);
-  });
-}