Updated references to the old button classes to the new ones in comments and...

Updated references to the old button classes to the new ones in comments and documentation for classes in the widgets, services and rendering libraries. (#62099)

packages/flutter/lib/src/rendering/proxy_box.dart

@@ -2980,7 +2980,7 @@ class RenderRepaintBoundary extends RenderProxyBox {
   ///     return RepaintBoundary(
   ///       key: globalKey,
   ///       child: Center(
-  ///         child: FlatButton(
+  ///         child: TextButton(
   ///           child: Text('Hello World', textDirection: TextDirection.ltr),
   ///           onPressed: _capturePng,
   ///         ),

packages/flutter/lib/src/services/system_chrome.dart

@@ -375,7 +375,7 @@ class SystemChrome {
   ///   return AnnotatedRegion(
   ///     value: _currentStyle,
   ///     child: Center(
-  ///       child: RaisedButton(
+  ///       child: ElevatedButton(
   ///         child: const Text('Change Color'),
   ///         onPressed: _changeColor,
   ///        ),

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

@@ -863,7 +863,7 @@ class _ActionsMarker extends InheritedWidget {
 ///         children: <Widget>[
 ///           Padding(
 ///             padding: const EdgeInsets.all(8.0),
-///             child: FlatButton(onPressed: () {}, child: Text('Press Me')),
+///             child: TextButton(onPressed: () {}, child: Text('Press Me')),
 ///           ),
 ///           Padding(
 ///             padding: const EdgeInsets.all(8.0),

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

@@ -120,7 +120,7 @@ typedef AnimatedSwitcherLayoutBuilder = Widget Function(Widget currentChild, Lis
 ///             style: Theme.of(context).textTheme.headline4,
 ///           ),
 ///         ),
-///         RaisedButton(
+///         ElevatedButton(
 ///           child: const Text('Increment'),
 ///           onPressed: () {
 ///             setState(() {

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

@@ -6204,7 +6204,7 @@ class MouseRegion extends StatefulWidget {
   ///   Widget build(BuildContext context) {
   ///     return Column(
   ///       children: <Widget>[
-  ///         RaisedButton(
+  ///         ElevatedButton(
   ///           onPressed: () {
   ///             setState(() { key = UniqueKey(); });
   ///           },

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

@@ -926,7 +926,7 @@ class EditableText extends StatefulWidget {
   ///                   title: const Text('Thats correct!'),
   ///                   content: Text ('13 is the right answer.'),
   ///                   actions: <Widget>[
-  ///                     FlatButton(
+  ///                     TextButton(
   ///                       onPressed: () { Navigator.pop(context); },
   ///                       child: const Text('OK'),
   ///                     ),

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

@@ -823,7 +823,7 @@ class FocusNode with DiagnosticableTreeMixin, ChangeNotifier {
   ///                   ],
   ///                 );
   ///               }),
-  ///               OutlineButton(
+  ///               OutlinedButton(
   ///                 child: const Text('UNFOCUS'),
   ///                 onPressed: () {
   ///                   setState(() {

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

@@ -801,7 +801,7 @@ class _FocusState extends State<Focus> {
 ///               children: <Widget>[
 ///                 // This button would be not visible, but still focusable from
 ///                 // the foreground pane without the FocusScope.
-///                 RaisedButton(
+///                 ElevatedButton(
 ///                   onPressed: () => print('You pressed the other button!'),
 ///                   child: Text('ANOTHER BUTTON TO FOCUS'),
 ///                 ),

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

@@ -20,7 +20,7 @@ import 'will_pop_scope.dart';
 ///
 /// {@tool dartpad --template=stateful_widget_scaffold}
 /// This example shows a [Form] with one [TextFormField] to enter an email
-/// address and a [RaisedButton] to submit the form. A [GlobalKey] is used here
+/// address and an [ElevatedButton] to submit the form. A [GlobalKey] is used here
 /// to identify the [Form] and validate input.
 ///
 /// ![](https://flutter.github.io/assets-for-api-docs/assets/widgets/form.png)
@@ -48,7 +48,7 @@ import 'will_pop_scope.dart';
 ///         ),
 ///         Padding(
 ///           padding: const EdgeInsets.symmetric(vertical: 16.0),
-///           child: RaisedButton(
+///           child: ElevatedButton(
 ///             onPressed: () {
 ///               // Validate will return true if the form is valid, or false if
 ///               // the form is invalid.

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

@@ -2041,7 +2041,7 @@ typedef ElementVisitor = void Function(Element element);
 ///       appBar: AppBar(title: Text('Demo')),
 ///       body: Builder(
 ///         builder: (BuildContext context) {
-///           return FlatButton(
+///           return TextButton(
 ///             child: Text('BUTTON'),
 ///             onPressed: () {
 ///               // here, Scaffold.of(context) returns the locally created Scaffold

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

@@ -1305,7 +1305,7 @@ class _AnimatedPositionedDirectionalState extends AnimatedWidgetBaseState<Animat
 ///           duration: Duration(seconds: 3),
 ///           child: FlutterLogo(),
 ///         ),
-///         RaisedButton(
+///         ElevatedButton(
 ///           child: Text('Fade Logo'),
 ///           onPressed: _changeOpacity,
 ///         ),

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

@@ -1085,7 +1085,7 @@ class DefaultTransitionDelegate<T> extends TransitionDelegate<T> {
 ///     return Scaffold(
 ///       appBar: AppBar(title: Text('My Page')),
 ///       body: Center(
-///         child: FlatButton(
+///         child: TextButton(
 ///           child: Text('POP'),
 ///           onPressed: () {
 ///             Navigator.pop(context);

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

@@ -44,7 +44,7 @@ import 'viewport.dart';
 /// {@tool snippet}
 ///
 /// This widget introduces a [MaterialApp], [Scaffold] and [PageView] with two pages
-/// using the default constructor. Both pages contain a [RaisedButton] allowing you
+/// using the default constructor. Both pages contain an [ElevatedButton] allowing you
 /// to animate the [PageView] using a [PageController].
 ///
 /// ```dart
@@ -79,8 +79,7 @@ import 'viewport.dart';
 ///             Container(
 ///               color: Colors.red,
 ///               child: Center(
-///                 child: RaisedButton(
-///                   color: Colors.white,
+///                 child: ElevatedButton(
 ///                   onPressed: () {
 ///                     if (_pageController.hasClients) {
 ///                       _pageController.animateToPage(
@@ -97,8 +96,7 @@ import 'viewport.dart';
 ///             Container(
 ///               color: Colors.blue,
 ///               child: Center(
-///                 child: RaisedButton(
-///                   color: Colors.white,
+///                 child: ElevatedButton(
 ///                   onPressed: () {
 ///                     if (_pageController.hasClients) {
 ///                       _pageController.animateToPage(
@@ -660,7 +658,7 @@ class PageView extends StatefulWidget {
   ///         child: Row(
   ///           mainAxisAlignment: MainAxisAlignment.center,
   ///           children: <Widget>[
-  ///             FlatButton(
+  ///             TextButton(
   ///               onPressed: () => _reverse(),
   ///               child: Text('Reverse items'),
   ///             ),

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

@@ -523,7 +523,7 @@ mixin LocalHistoryRoute<T> on Route<T> {
   ///           children: <Widget>[
   ///             Text('HomePage'),
   ///             // Press this button to open the SecondPage.
-  ///             RaisedButton(
+  ///             ElevatedButton(
   ///               child: Text('Second Page >'),
   ///               onPressed: () {
   ///                 Navigator.pushNamed(context, '/second_page');
@@ -568,7 +568,7 @@ mixin LocalHistoryRoute<T> on Route<T> {
   ///           height: 100.0,
   ///           color: Colors.red,
   ///         )
-  ///       : RaisedButton(
+  ///       : ElevatedButton(
   ///           child: Text('Show Rectangle'),
   ///           onPressed: _navigateLocallyToShowRectangle,
   ///         );
@@ -579,7 +579,7 @@ mixin LocalHistoryRoute<T> on Route<T> {
   ///           mainAxisAlignment: MainAxisAlignment.center,
   ///           children: <Widget>[
   ///             localNavContent,
-  ///             RaisedButton(
+  ///             ElevatedButton(
   ///               child: Text('< Back'),
   ///               onPressed: () {
   ///                 // Pop a route. If this is pressed while the red rectangle is

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

@@ -1278,7 +1278,7 @@ class ListView extends BoxScrollView {
   ///         child: Row(
   ///           mainAxisAlignment: MainAxisAlignment.center,
   ///           children: <Widget>[
-  ///             FlatButton(
+  ///             TextButton(
   ///               onPressed: () => _reverse(),
   ///               child: Text('Reverse items'),
   ///             ),

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

@@ -373,7 +373,7 @@ class _RenderSliverFractionalPadding extends RenderSliverEdgeInsetsPadding {
 ///             alignment: Alignment.bottomCenter,
 ///             child: Padding(
 ///               padding: const EdgeInsets.all(16.0),
-///               child: RaisedButton(
+///               child: ElevatedButton(
 ///                 onPressed: () {
 ///                   /* Place your onPressed code here! */
 ///                 },

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

@@ -322,7 +322,7 @@ class DefaultTextHeightBehavior extends InheritedTheme {
 /// To make [Text] react to touch events, wrap it in a [GestureDetector] widget
 /// with a [GestureDetector.onTap] handler.
 ///
-/// In a material design application, consider using a [FlatButton] instead, or
+/// In a material design application, consider using a [TextButton] instead, or
 /// if that isn't appropriate, at least using an [InkWell] instead of
 /// [GestureDetector].
 ///