Remove deprecated OutlineButton (#98546)

packages/flutter/lib/material.dart

@@ -104,7 +104,6 @@ export 'src/material/navigation_bar_theme.dart';
 export 'src/material/navigation_rail.dart';
 export 'src/material/navigation_rail_theme.dart';
 export 'src/material/no_splash.dart';
-export 'src/material/outline_button.dart';
 export 'src/material/outlined_button.dart';
 export 'src/material/outlined_button_theme.dart';
 export 'src/material/page.dart';

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

@@ -26,10 +26,10 @@ import 'theme_data.dart';
 /// [ButtonStyle] of a [TextButton], [ElevatedButton] or an
 /// [OutlinedButton].
 ///
-/// FlatButton, RaisedButton, and OutlineButton have been replaced by
-/// TextButton, ElevatedButton, and OutlinedButton respectively.
-/// ButtonTheme has been replaced by TextButtonTheme,
-/// ElevatedButtonTheme, and OutlinedButtonTheme. The original classes
+/// FlatButton and RaisedButton have been replaced by
+/// TextButton and ElevatedButton respectively.
+/// ButtonTheme has been replaced by TextButtonTheme and
+/// ElevatedButtonTheme. The original classes
 /// have been deprecated, please migrate code that uses them.
 /// There's a detailed migration guide for the new button and button
 /// theme classes in

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

@@ -11,7 +11,6 @@ import 'constants.dart';
 import 'flat_button.dart';
 import 'material_button.dart';
 import 'material_state.dart';
-import 'outline_button.dart';
 import 'raised_button.dart';
 import 'theme.dart';
 import 'theme_data.dart' show MaterialTapTargetSize;
@@ -22,7 +21,7 @@ import 'theme_data.dart' show MaterialTapTargetSize;
 ///
 /// See also:
 ///
-///  * [RaisedButton], [FlatButton], [OutlineButton], which are configured
+///  * [RaisedButton] and [FlatButton] which are configured
 ///    based on the ambient [ButtonTheme].
 enum ButtonTextTheme {
   /// Button text is black or white depending on [ThemeData.brightness].
@@ -69,7 +68,7 @@ enum ButtonBarLayoutBehavior {
 ///
 /// See also:
 ///
-///  * [FlatButton] [RaisedButton], and [OutlineButton], which are styled
+///  * [FlatButton] and [RaisedButton] which are styled
 ///    based on the ambient button theme.
 ///  * [RawMaterialButton], which can be used to configure a button that doesn't
 ///    depend on any inherited themes.
@@ -175,10 +174,10 @@ class ButtonTheme extends InheritedTheme {
 ///  * [ElevatedButton], [ElevatedButtonTheme], [ElevatedButtonThemeData],
 ///  * [OutlinedButton], [OutlinedButtonTheme], [OutlinedButtonThemeData]
 ///
-/// FlatButton, RaisedButton, and OutlineButton have been replaced by
-/// TextButton, ElevatedButton, and OutlinedButton respectively.
-/// ButtonTheme has been replaced by TextButtonTheme,
-/// ElevatedButtonTheme, and OutlinedButtonTheme. The original classes
+/// FlatButton and RaisedButton have been replaced by
+/// TextButton and ElevatedButton respectively.
+/// ButtonTheme has been replaced by TextButtonTheme and
+/// ElevatedButtonTheme. The original classes
 /// have been deprecated, please migrate code that uses them.
 /// There's a detailed migration guide for the new button and button
 /// theme classes in
@@ -197,8 +196,8 @@ class ButtonThemeData with Diagnosticable {
   /// [height] parameters must greater than or equal to zero.
   ///
   /// The ButtonTheme's methods that have a [MaterialButton] parameter and
-  /// have a name with a `get` prefix are used by [RaisedButton],
-  /// [OutlineButton], and [FlatButton] to configure a [RawMaterialButton].
+  /// have a name with a `get` prefix are used by [RaisedButton]
+  /// and [FlatButton] to configure a [RawMaterialButton].
   const ButtonThemeData({
     this.textTheme = ButtonTextTheme.normal,
     this.minWidth = 88.0,
@@ -279,8 +278,7 @@ class ButtonThemeData with Diagnosticable {
   ///
   /// See also:
   ///
-  ///  * [getPadding], which is used by [RaisedButton], [OutlineButton]
-  ///    and [FlatButton].
+  ///  * [getPadding], which is used by [RaisedButton] and [FlatButton].
   EdgeInsetsGeometry get padding {
     if (_padding != null)
       return _padding!;
@@ -306,8 +304,7 @@ class ButtonThemeData with Diagnosticable {
   ///
   /// See also:
   ///
-  ///  * [getShape], which is used by [RaisedButton], [OutlineButton]
-  ///    and [FlatButton].
+  ///  * [getShape], which is used by [RaisedButton] and [FlatButton].
   ShapeBorder get shape {
     if (_shape != null)
       return _shape!;
@@ -369,8 +366,7 @@ class ButtonThemeData with Diagnosticable {
   ///
   /// See also:
   ///
-  ///  * [getFocusColor], which is used by [RaisedButton], [OutlineButton]
-  ///    and [FlatButton].
+  ///  * [getFocusColor], which is used by [RaisedButton] and [FlatButton].
   final Color? _focusColor;
 
   /// The fill color of the button when a pointer is hovering over it.
@@ -382,8 +378,7 @@ class ButtonThemeData with Diagnosticable {
   ///
   /// See also:
   ///
-  ///  * [getHoverColor], which is used by [RaisedButton], [OutlineButton]
-  ///    and [FlatButton].
+  ///  * [getHoverColor], which is used by [RaisedButton] and [FlatButton].
   final Color? _hoverColor;
 
   /// The color of the overlay that appears when a button is pressed.
@@ -392,8 +387,7 @@ class ButtonThemeData with Diagnosticable {
   ///
   /// See also:
   ///
-  ///  * [getHighlightColor], which is used by [RaisedButton], [OutlineButton]
-  ///    and [FlatButton].
+  ///  * [getHighlightColor], which is used by [RaisedButton] and [FlatButton].
   final Color? _highlightColor;
 
   /// The color of the ink "splash" overlay that appears when a button is tapped.
@@ -402,8 +396,7 @@ class ButtonThemeData with Diagnosticable {
   ///
   /// See also:
   ///
-  ///  * [getSplashColor], which is used by [RaisedButton], [OutlineButton]
-  ///    and [FlatButton].
+  ///  * [getSplashColor], which is used by [RaisedButton] and [FlatButton].
   final Color? _splashColor;
 
   /// A set of thirteen colors that can be used to derive the button theme's
@@ -424,8 +417,7 @@ class ButtonThemeData with Diagnosticable {
   //
   // See also:
   //
-  //  * [getMaterialTargetTapSize], which is used by [RaisedButton],
-  //    [OutlineButton] and [FlatButton].
+  //  * [getMaterialTargetTapSize], which is used by [RaisedButton] and [FlatButton].
   final MaterialTapTargetSize? _materialTapTargetSize;
 
   /// The [button]'s overall brightness.
@@ -489,7 +481,7 @@ class ButtonThemeData with Diagnosticable {
   /// Otherwise, returns [MaterialButton.disabledColor] if it is non-null and
   /// the button is disabled.
   ///
-  /// Otherwise, if button is a [FlatButton] or an [OutlineButton] then null is
+  /// Otherwise, if button is a [FlatButton] then null is
   /// returned.
   ///
   /// Otherwise, if button is a [RaisedButton], returns the `buttonColor`
@@ -510,7 +502,7 @@ class ButtonThemeData with Diagnosticable {
     if (fillColor != null)
       return fillColor;
 
-    if (button is FlatButton || button is OutlineButton || button.runtimeType == MaterialButton)
+    if (button is FlatButton || button.runtimeType == MaterialButton)
       return null;
 
     if (button.enabled && button is RaisedButton && _buttonColor != null)
@@ -542,7 +534,7 @@ class ButtonThemeData with Diagnosticable {
   ///    [getBrightness] resolves to [Brightness.light].
   ///  * [ButtonTextTheme.accent]: [ColorScheme.secondary] of [colorScheme].
   ///  * [ButtonTextTheme.primary]: If [getFillColor] is dark then [Colors.white],
-  ///    otherwise if [button] is a [FlatButton] or an [OutlineButton] then
+  ///    otherwise if [button] is a [FlatButton] then
   ///    [ColorScheme.primary] of [colorScheme], otherwise [Colors.black].
   Color getTextColor(MaterialButton button) {
     if (!button.enabled)
@@ -565,7 +557,7 @@ class ButtonThemeData with Diagnosticable {
           : getBrightness(button) == Brightness.dark;
         if (fillIsDark)
           return Colors.white;
-        if (button is FlatButton || button is OutlineButton)
+        if (button is FlatButton)
           return colorScheme!.primary;
         return Colors.black;
     }
@@ -577,7 +569,7 @@ class ButtonThemeData with Diagnosticable {
   /// Returns the button's [MaterialButton.splashColor] if it is non-null.
   ///
   /// Otherwise, returns the value of the `splashColor` constructor parameter
-  /// it is non-null and [button] is a [RaisedButton] or an [OutlineButton].
+  /// it is non-null and [button] is a [RaisedButton].
   ///
   /// Otherwise, returns the value of the `splashColor` constructor parameter
   /// if it is non-null and [button] is a [FlatButton] and
@@ -588,7 +580,7 @@ class ButtonThemeData with Diagnosticable {
     if (button.splashColor != null)
       return button.splashColor!;
 
-    if (_splashColor != null && (button is RaisedButton || button is OutlineButton))
+    if (_splashColor != null && button is RaisedButton)
       return _splashColor!;
 
     if (_splashColor != null && button is FlatButton) {
@@ -669,15 +661,13 @@ class ButtonThemeData with Diagnosticable {
   ///
   /// Returns the button's [MaterialButton.focusElevation] if it is non-null.
   ///
-  /// If button is a [FlatButton] or an [OutlineButton] then the focus
+  /// If button is a [FlatButton] then the focus
   /// elevation is 0.0, otherwise the highlight elevation is 4.0.
   double getFocusElevation(MaterialButton button) {
     if (button.focusElevation != null)
       return button.focusElevation!;
     if (button is FlatButton)
       return 0.0;
-    if (button is OutlineButton)
-      return 0.0;
     return 4.0;
   }
 
@@ -685,15 +675,13 @@ class ButtonThemeData with Diagnosticable {
   ///
   /// Returns the button's [MaterialButton.hoverElevation] if it is non-null.
   ///
-  /// If button is a [FlatButton] or an [OutlineButton] then the hover
+  /// If button is a [FlatButton] then the hover
   /// elevation is 0.0, otherwise the highlight elevation is 4.0.
   double getHoverElevation(MaterialButton button) {
     if (button.hoverElevation != null)
       return button.hoverElevation!;
     if (button is FlatButton)
       return 0.0;
-    if (button is OutlineButton)
-      return 0.0;
     return 4.0;
   }
 
@@ -701,15 +689,13 @@ class ButtonThemeData with Diagnosticable {
   ///
   /// Returns the button's [MaterialButton.highlightElevation] if it is non-null.
   ///
-  /// If button is a [FlatButton] or an [OutlineButton] then the highlight
+  /// If button is a [FlatButton] then the highlight
   /// elevation is 0.0, otherwise the highlight elevation is 8.0.
   double getHighlightElevation(MaterialButton button) {
     if (button.highlightElevation != null)
       return button.highlightElevation!;
     if (button is FlatButton)
       return 0.0;
-    if (button is OutlineButton)
-      return 0.0;
     return 8.0;
   }
 
@@ -730,7 +716,7 @@ class ButtonThemeData with Diagnosticable {
   /// Returns the button's [MaterialButton.padding] if it is non-null.
   ///
   /// If this is a button constructed with [RaisedButton.icon] or
-  /// [FlatButton.icon] or [OutlineButton.icon] then the padding is:
+  /// [FlatButton.icon] then the padding is:
   /// `EdgeInsetsDirectional.only(start: 12.0, end: 16.0)`.
   ///
   /// Otherwise, returns [padding] if it is non-null.

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

@@ -14,10 +14,10 @@ import 'theme_data.dart';
 ///
 /// ### This class is deprecated, please use [TextButton] instead.
 ///
-/// FlatButton, RaisedButton, and OutlineButton have been replaced by
-/// [TextButton], [ElevatedButton], and [OutlinedButton] respectively.
-/// ButtonTheme has been replaced by [TextButtonTheme],
-/// [ElevatedButtonTheme], and [OutlinedButtonTheme]. The original classes
+/// FlatButton and RaisedButton have been replaced by
+/// [TextButton] and [ElevatedButton] respectively.
+/// ButtonTheme has been replaced by [TextButtonTheme] and
+/// [ElevatedButtonTheme]. The original classes
 /// will eventually be removed, please migrate code that uses them.
 /// There's a detailed migration guide for the new button and button
 /// theme classes in

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

@@ -21,10 +21,10 @@ import 'theme_data.dart';
 ///
 /// ### This class is obsolete.
 ///
-/// FlatButton, RaisedButton, and OutlineButton have been replaced by
-/// TextButton, ElevatedButton, and OutlinedButton respectively.
-/// ButtonTheme has been replaced by TextButtonTheme,
-/// ElevatedButtonTheme, and OutlinedButtonTheme. The appearance of the
+/// FlatButton and RaisedButton have been replaced by
+/// TextButton and ElevatedButton respectively.
+/// ButtonTheme has been replaced by TextButtonTheme and
+/// ElevatedButtonTheme. The appearance of the
 /// new widgets can be customized by specifying a [ButtonStyle]
 /// or by creating a one-off style using a `styleFrom` method like
 /// [TextButton.styleFrom]. The original button classes
@@ -38,8 +38,8 @@ import 'theme_data.dart';
 /// MaterialButtons whose [onPressed] and [onLongPress] callbacks are null will be disabled. To have
 /// an enabled button, make sure to pass a non-null value for [onPressed] or [onLongPress].
 ///
-/// Rather than using this class directly, consider using [FlatButton],
-/// [OutlineButton], or [RaisedButton], which configure this class with
+/// Rather than using this class directly, consider using [FlatButton]
+/// or [RaisedButton], which configure this class with
 /// appropriate defaults that match the material design specification.
 ///
 /// To create a button directly, without inheriting theme defaults, use
@@ -457,8 +457,8 @@ class MaterialButton extends StatelessWidget {
   }
 }
 
-/// The type of [MaterialButton]s created with RaisedButton.icon, FlatButton.icon,
-/// and OutlineButton.icon.
+/// The type of [MaterialButton]s created with RaisedButton.icon] and
+/// FlatButton.icon.
 ///
 /// This mixin only exists to give the "label and icon" button widgets a distinct
 /// type for the sake of [ButtonTheme].

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

@@ -16,10 +16,10 @@ import 'theme_data.dart';
 ///
 /// ### This class is deprecated, please use [ElevatedButton] instead.
 ///
-/// FlatButton, RaisedButton, and OutlineButton have been replaced by
-/// [TextButton], [ElevatedButton], and [OutlinedButton] respectively.
-/// ButtonTheme has been replaced by [TextButtonTheme],
-/// [ElevatedButtonTheme], and [OutlinedButtonTheme]. The original classes
+/// FlatButton and RaisedButton have been replaced by
+/// [TextButton] and [ElevatedButton] respectively.
+/// ButtonTheme has been replaced by [TextButtonTheme] and
+/// [ElevatedButtonTheme]. The original classes
 /// will eventually be removed, please migrate code that uses them.
 /// There's a detailed migration guide for the new button and button
 /// theme classes in

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

@@ -81,7 +81,6 @@ const Color _kDarkThemeSplashColor = Color(0x40CCCCCC);
 ///   * [OutlinedButton]
 ///   * [TextButton]
 ///   * [ElevatedButton]
-///   * [OutlineButton]
 ///   * [FlatButton]
 ///   * [RaisedButton]
 ///   * The time picker widget ([showTimePicker])
@@ -2469,7 +2468,6 @@ class _FifoCache<K, V> {
 ///  * [InputDecorator] (which gives density support to [TextField], etc.)
 ///  * [ListTile]
 ///  * [MaterialButton]
-///  * [OutlineButton]
 ///  * [OutlinedButton]
 ///  * [Radio]
 ///  * [RawMaterialButton]

packages/flutter/test/material/theme_defaults_test.dart

@@ -127,93 +127,6 @@ void main() {
     });
   });
 
-  group('OutlineButton', () {
-    testWidgets('theme: ThemeData.light(), enabled: true, highlightElevation: 2.0', (WidgetTester tester) async {
-      await tester.pumpWidget(
-        MaterialApp(
-          theme: ThemeData.light(),
-          home: Center(
-            child: OutlineButton(
-              onPressed: () { }, // button.enabled == true
-              // Causes the button to be filled with the theme's canvasColor
-              // instead of Colors.transparent before the button material's
-              // elevation is animated to 2.0.
-              highlightElevation: 2.0,
-              child: const Text('button'),
-            ),
-          ),
-        ),
-      );
-
-      final RawMaterialButton raw = tester.widget<RawMaterialButton>(find.byType(RawMaterialButton));
-      expect(raw.textStyle!.color, const Color(0xdd000000));
-      expect(raw.fillColor, const Color(0x00fafafa));
-      expect(raw.highlightColor, const Color(0x29000000)); // Was Color(0x66bcbcbc)
-      expect(raw.splashColor, const Color(0x1f000000)); // Was Color(0x66c8c8c8)
-      expect(raw.elevation, 0.0);
-      expect(raw.highlightElevation, 0.0);
-      expect(raw.disabledElevation, 0.0);
-      expect(raw.constraints, defaultButtonConstraints);
-      expect(raw.padding, defaultButtonPadding);
-      // animationDuration can't be configured by the theme/constructor
-      expect(raw.materialTapTargetSize, MaterialTapTargetSize.padded);
-    });
-
-    testWidgets('theme: ThemeData.light(), enabled: true', (WidgetTester tester) async {
-      await tester.pumpWidget(
-        MaterialApp(
-          theme: ThemeData.light(),
-          home: Center(
-            child: OutlineButton(
-              onPressed: () { }, // button.enabled == true
-              child: const Text('button'),
-            ),
-          ),
-        ),
-      );
-
-      final RawMaterialButton raw = tester.widget<RawMaterialButton>(find.byType(RawMaterialButton));
-      expect(raw.textStyle!.color, const Color(0xdd000000));
-      expect(raw.fillColor, Colors.transparent);
-      expect(raw.highlightColor, const Color(0x29000000)); // Was Color(0x66bcbcbc)
-      expect(raw.splashColor, const Color(0x1f000000)); // Was Color(0x66c8c8c8)
-      expect(raw.elevation, 0.0);
-      expect(raw.highlightElevation, 0.0);
-      expect(raw.disabledElevation, 0.0);
-      expect(raw.constraints, defaultButtonConstraints);
-      expect(raw.padding, defaultButtonPadding);
-      // animationDuration can't be configured by the theme/constructor
-      expect(raw.materialTapTargetSize, MaterialTapTargetSize.padded);
-    });
-
-    testWidgets('theme: ThemeData.light(), enabled: false', (WidgetTester tester) async {
-      await tester.pumpWidget(
-        MaterialApp(
-          theme: ThemeData.light(),
-          home: const Center(
-            child: OutlineButton(
-              onPressed: null, // button.enabled == false
-              child: Text('button'),
-            ),
-          ),
-        ),
-      );
-
-      final RawMaterialButton raw = tester.widget<RawMaterialButton>(find.byType(RawMaterialButton));
-      expect(raw.textStyle!.color, const Color(0x61000000));
-      expect(raw.fillColor, const Color(0x00000000));
-      // highlightColor, disabled button can't be pressed
-      // splashColor, disabled button doesn't splash
-      expect(raw.elevation, 0.0);
-      expect(raw.highlightElevation, 0.0);
-      expect(raw.disabledElevation, 0.0);
-      expect(raw.constraints, defaultButtonConstraints);
-      expect(raw.padding, defaultButtonPadding);
-      // animationDuration can't be configured by the theme/constructor
-      expect(raw.materialTapTargetSize, MaterialTapTargetSize.padded);
-    });
-  });
-
   group('FloatingActionButton', () {
     const BoxConstraints defaultFABConstraints = BoxConstraints.tightFor(width: 56.0, height: 56.0);
     const ShapeBorder defaultFABShape = CircleBorder();