chore(deps): upgrade flutter & dart and apply dart fix

example/lib/main.dart

@@ -119,14 +119,14 @@ class VerticalSpinBoxPage extends StatelessWidget {
                   textStyle: TextStyle(fontSize: 48),
                   incrementIcon: Icon(Icons.keyboard_arrow_up, size: 64),
                   decrementIcon: Icon(Icons.keyboard_arrow_down, size: 64),
-                  iconColor: MaterialStateProperty.resolveWith((states) {
-                    if (states.contains(MaterialState.disabled)) {
+                  iconColor: WidgetStateProperty.resolveWith((states) {
+                    if (states.contains(WidgetState.disabled)) {
                       return Colors.grey;
                     }
-                    if (states.contains(MaterialState.error)) {
+                    if (states.contains(WidgetState.error)) {
                       return Colors.red;
                     }
-                    if (states.contains(MaterialState.focused)) {
+                    if (states.contains(WidgetState.focused)) {
                       return Colors.blue;
                     }
                     return Colors.black;

lib/flutter_spinbox.dart

@@ -44,7 +44,7 @@
 ///
 /// SpinBox for Flutter comes in two variants. It provides implementations for
 /// both designs in Flutter, Material and Cupertino (iOS).
-library flutter_spinbox;
+library;
 
 export 'cupertino.dart';
 export 'material.dart';

lib/src/base_spin_box.dart

@@ -28,7 +28,7 @@ import 'spin_formatter.dart';
 // ignore_for_file: public_member_api_docs
 
 abstract class BaseSpinBox extends StatefulWidget {
-  const BaseSpinBox({Key? key}) : super(key: key);
+  const BaseSpinBox({super.key});
 
   double get min;
   double get max;

lib/src/cupertino/spin_box.dart

@@ -48,7 +48,7 @@ part 'third_party/default_rounded_border.dart';
 class CupertinoSpinBox extends BaseSpinBox {
   /// Creates a spinbox.
   CupertinoSpinBox({
-    Key? key,
+    super.key,
     this.min = 0,
     this.max = 100,
     this.step = 1,
@@ -96,8 +96,7 @@ class CupertinoSpinBox extends BaseSpinBox {
         incrementIcon =
             incrementIcon ?? const Icon(CupertinoIcons.plus_circled),
         decrementIcon =
-            decrementIcon ?? const Icon(CupertinoIcons.minus_circled),
-        super(key: key);
+            decrementIcon ?? const Icon(CupertinoIcons.minus_circled);
 
   /// The minimum value the user can enter.
   ///

lib/src/cupertino/spin_button.dart

@@ -30,15 +30,15 @@ const double kSpinPadding = 16;
 
 class CupertinoSpinButton extends StatelessWidget {
   const CupertinoSpinButton({
-    Key? key,
+    super.key,
     required this.icon,
     this.color,
     this.enabled = true,
     required this.step,
     this.acceleration,
     required this.interval,
     required this.onStep,
-  }) : super(key: key);
+  });
 
   final Icon icon;
   final Color? color;

lib/src/material/spin_box.dart

@@ -49,7 +49,7 @@ import 'spin_button.dart';
 class SpinBox extends BaseSpinBox {
   /// Creates a spinbox.
   SpinBox({
-    Key? key,
+    super.key,
     this.min = 0,
     this.max = 100,
     this.step = 1,
@@ -95,8 +95,7 @@ class SpinBox extends BaseSpinBox {
             ),
         enabled = (enabled ?? true) && min < max,
         incrementIcon = incrementIcon ?? const Icon(Icons.add),
-        decrementIcon = decrementIcon ?? const Icon(Icons.remove),
-        super(key: key);
+        decrementIcon = decrementIcon ?? const Icon(Icons.remove);
 
   /// The minimum value the user can enter.
   ///
@@ -194,7 +193,7 @@ class SpinBox extends BaseSpinBox {
   ///
   /// If `null`, then the value of [SpinBoxThemeData.iconColor] is used. If
   /// that is also `null`, then pre-defined defaults are used.
-  final MaterialStateProperty<Color?>? iconColor;
+  final WidgetStateProperty<Color?>? iconColor;
 
   /// Whether the increment and decrement buttons are shown.
   ///
@@ -281,14 +280,10 @@ class SpinBoxState extends State<SpinBox> with SpinBoxMixin {
     if (!widget.enabled) return theme.disabledColor;
     if (hasFocus && errorText == null) return theme.colorScheme.primary;
 
-    switch (theme.brightness) {
-      case Brightness.dark:
-        return Colors.white70;
-      case Brightness.light:
-        return Colors.black45;
-      default:
-        return theme.iconTheme.color;
-    }
+    return switch (theme.brightness) {
+      Brightness.dark => Colors.white70,
+      Brightness.light => Colors.black45,
+    };
   }
 
   double _textHeight(String? text, TextStyle style) {
@@ -318,19 +313,19 @@ class SpinBoxState extends State<SpinBox> with SpinBoxMixin {
 
     final iconColor = widget.iconColor ??
         spinBoxTheme?.iconColor ??
-        MaterialStateProperty.all(_iconColor(theme, errorText));
+        WidgetStateProperty.all(_iconColor(theme, errorText));
 
-    final states = <MaterialState>{
-      if (!widget.enabled) MaterialState.disabled,
-      if (hasFocus) MaterialState.focused,
-      if (errorText != null) MaterialState.error,
+    final states = <WidgetState>{
+      if (!widget.enabled) WidgetState.disabled,
+      if (hasFocus) WidgetState.focused,
+      if (errorText != null) WidgetState.error,
     };
 
-    final decrementStates = Set<MaterialState>.of(states);
-    if (value <= widget.min) decrementStates.add(MaterialState.disabled);
+    final decrementStates = Set<WidgetState>.of(states);
+    if (value <= widget.min) decrementStates.add(WidgetState.disabled);
 
-    final incrementStates = Set<MaterialState>.of(states);
-    if (value >= widget.max) incrementStates.add(MaterialState.disabled);
+    final incrementStates = Set<WidgetState>.of(states);
+    if (value >= widget.max) incrementStates.add(WidgetState.disabled);
 
     var bottom = 0.0;
     final isHorizontal = widget.direction == Axis.horizontal;

lib/src/material/spin_box_theme.dart

@@ -23,12 +23,12 @@ class SpinBoxThemeData with Diagnosticable {
   /// The color to use for [SpinBox.incrementIcon] and [SpinBox.decrementIcon].
   ///
   /// Resolves in the following states:
-  ///  * [MaterialState.focused].
-  ///  * [MaterialState.disabled].
-  ///  * [MaterialState.error].
+  ///  * [WidgetState.focused].
+  ///  * [WidgetState.disabled].
+  ///  * [WidgetState.error].
   ///
   /// If specified, overrides the default value of [SpinBox.iconColor].
-  final MaterialStateProperty<Color?>? iconColor;
+  final WidgetStateProperty<Color?>? iconColor;
 
   /// See [TextField.decoration].
   ///
@@ -39,7 +39,7 @@ class SpinBoxThemeData with Diagnosticable {
   /// new values.
   SpinBoxThemeData copyWith({
     double? iconSize,
-    MaterialStateProperty<Color?>? iconColor,
+    WidgetStateProperty<Color?>? iconColor,
     InputDecoration? decoration,
   }) {
     return SpinBoxThemeData(
@@ -73,7 +73,7 @@ class SpinBoxThemeData with Diagnosticable {
       ),
     );
     properties.add(
-      DiagnosticsProperty<MaterialStateProperty<Color?>>(
+      DiagnosticsProperty<WidgetStateProperty<Color?>>(
         'iconColor',
         iconColor,
         defaultValue: null,
@@ -103,10 +103,10 @@ class SpinBoxTheme extends InheritedWidget {
   /// Constructs a checkbox theme that configures all descendant [SpinBox]
   /// widgets.
   const SpinBoxTheme({
-    Key? key,
+    super.key,
     required this.data,
-    required Widget child,
-  }) : super(key: key, child: child);
+    required super.child,
+  });
 
   /// The properties used for all descendant [SpinBox] widgets.
   final SpinBoxThemeData data;

lib/src/material/spin_button.dart

@@ -28,7 +28,7 @@ import '../spin_gesture.dart';
 
 class SpinButton extends StatelessWidget {
   const SpinButton({
-    Key? key,
+    super.key,
     required this.icon,
     this.iconSize,
     this.color,
@@ -37,7 +37,7 @@ class SpinButton extends StatelessWidget {
     this.acceleration,
     required this.interval,
     required this.onStep,
-  }) : super(key: key);
+  });
 
   final Icon icon;
   final double? iconSize;

lib/src/spin_gesture.dart

@@ -28,14 +28,14 @@ import 'package:flutter/material.dart';
 
 class SpinGesture extends StatefulWidget {
   const SpinGesture({
-    Key? key,
+    super.key,
     this.enabled = true,
     required this.child,
     required this.step,
     this.acceleration,
     required this.interval,
     required this.onStep,
-  }) : super(key: key);
+  });
 
   final bool enabled;
   final Widget child;

pubspec.yaml

@@ -8,8 +8,8 @@ repository: https://github.com/jpnurmi/flutter_spinbox
 issue_tracker: https://github.com/jpnurmi/flutter_spinbox/issues
 
 environment:
-  sdk: ">=2.14.0 <4.0.0"
-  flutter: ">=3.7.0"
+  sdk: ">=3.6.0 <4.0.0"
+  flutter: ">=3.27.0"
 
 dependencies:
   cupertino_icons: ^1.0.2

test/cupertino_spinbox_test.dart

@@ -4,8 +4,8 @@ import 'package:flutter_spinbox/cupertino.dart';
 import 'test_spinbox.dart';
 
 class TestApp extends CupertinoApp {
-  TestApp({Key? key, required Widget widget})
-      : super(key: key, home: CupertinoPageScaffold(child: widget));
+  TestApp({super.key, required Widget widget})
+      : super(home: CupertinoPageScaffold(child: widget));
 }
 
 void main() {

test/material_spinbox_test.dart

@@ -5,8 +5,8 @@ import 'package:flutter_test/flutter_test.dart';
 import 'test_spinbox.dart';
 
 class TestApp extends MaterialApp {
-  TestApp({Key? key, required Widget widget})
-      : super(key: key, home: Scaffold(body: widget));
+  TestApp({super.key, required Widget widget})
+      : super(home: Scaffold(body: widget));
 }
 
 void main() {
@@ -83,10 +83,10 @@ void main() {
   });
 
   group('icon color', () {
-    final iconColor = MaterialStateProperty.resolveWith((states) {
-      if (states.contains(MaterialState.disabled)) return Colors.yellow;
-      if (states.contains(MaterialState.error)) return Colors.red;
-      if (states.contains(MaterialState.focused)) return Colors.blue;
+    final iconColor = WidgetStateProperty.resolveWith((states) {
+      if (states.contains(WidgetState.disabled)) return Colors.yellow;
+      if (states.contains(WidgetState.error)) return Colors.red;
+      if (states.contains(WidgetState.focused)) return Colors.blue;
       return Colors.green;
     });
 
@@ -198,7 +198,7 @@ void main() {
         TestApp(
           widget: SpinBoxTheme(
             data: SpinBoxThemeData(
-              iconColor: MaterialStateProperty.all(Colors.black),
+              iconColor: WidgetStateProperty.all(Colors.black),
             ),
             child: SpinBox(iconColor: iconColor),
           ),

test/test_spinbox.dart

@@ -335,11 +335,11 @@ void testCallbacks<S>(TestChangeBuilder builder) {
   group('callbacks', () {
     late StreamController<double> controller;
 
-    setUp(() async {
+    setUp(() {
       controller = StreamController<double>();
     });
 
-    tearDown(() async {
+    tearDown(() {
       controller.close();
     });
 
@@ -373,11 +373,11 @@ void testLongPress<S>(TestChangeBuilder builder) {
   group('long press', () {
     late StreamController<double> controller;
 
-    setUp(() async {
+    setUp(() {
       controller = StreamController<double>();
     });
 
-    tearDown(() async {
+    tearDown(() {
       controller.close();
     });