CupertinoButton: Add clickable cursor on web (#96863)

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

@@ -245,43 +245,46 @@ class _CupertinoButtonState extends State<CupertinoButton> with SingleTickerProv
 
     final TextStyle textStyle = themeData.textTheme.textStyle.copyWith(color: foregroundColor);
 
-    return GestureDetector(
-      behavior: HitTestBehavior.opaque,
-      onTapDown: enabled ? _handleTapDown : null,
-      onTapUp: enabled ? _handleTapUp : null,
-      onTapCancel: enabled ? _handleTapCancel : null,
-      onTap: widget.onPressed,
-      child: Semantics(
-        button: true,
-        child: ConstrainedBox(
-          constraints: widget.minSize == null
-            ? const BoxConstraints()
-            : BoxConstraints(
-                minWidth: widget.minSize!,
-                minHeight: widget.minSize!,
-              ),
-          child: FadeTransition(
-            opacity: _opacityAnimation,
-            child: DecoratedBox(
-              decoration: BoxDecoration(
-                borderRadius: widget.borderRadius,
-                color: backgroundColor != null && !enabled
-                  ? CupertinoDynamicColor.resolve(widget.disabledColor, context)
-                  : backgroundColor,
-              ),
-              child: Padding(
-                padding: widget.padding ?? (backgroundColor != null
-                  ? _kBackgroundButtonPadding
-                  : _kButtonPadding),
-                child: Align(
-                  alignment: widget.alignment,
-                  widthFactor: 1.0,
-                  heightFactor: 1.0,
-                  child: DefaultTextStyle(
-                    style: textStyle,
-                    child: IconTheme(
-                      data: IconThemeData(color: foregroundColor),
-                      child: widget.child,
+    return MouseRegion(
+      cursor: enabled && kIsWeb ? SystemMouseCursors.click : MouseCursor.defer,
+      child: GestureDetector(
+        behavior: HitTestBehavior.opaque,
+        onTapDown: enabled ? _handleTapDown : null,
+        onTapUp: enabled ? _handleTapUp : null,
+        onTapCancel: enabled ? _handleTapCancel : null,
+        onTap: widget.onPressed,
+        child: Semantics(
+          button: true,
+          child: ConstrainedBox(
+            constraints: widget.minSize == null
+              ? const BoxConstraints()
+              : BoxConstraints(
+                  minWidth: widget.minSize!,
+                  minHeight: widget.minSize!,
+                ),
+            child: FadeTransition(
+              opacity: _opacityAnimation,
+              child: DecoratedBox(
+                decoration: BoxDecoration(
+                  borderRadius: widget.borderRadius,
+                  color: backgroundColor != null && !enabled
+                    ? CupertinoDynamicColor.resolve(widget.disabledColor, context)
+                    : backgroundColor,
+                ),
+                child: Padding(
+                  padding: widget.padding ?? (backgroundColor != null
+                    ? _kBackgroundButtonPadding
+                    : _kButtonPadding),
+                  child: Align(
+                    alignment: widget.alignment,
+                    widthFactor: 1.0,
+                    heightFactor: 1.0,
+                    child: DefaultTextStyle(
+                      style: textStyle,
+                      child: IconTheme(
+                        data: IconThemeData(color: foregroundColor),
+                        child: widget.child,
+                      ),
                     ),
                   ),
                 ),

packages/flutter/test/cupertino/button_test.dart

@@ -3,6 +3,8 @@
 // found in the LICENSE file.
 
 import 'package:flutter/cupertino.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/gestures.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -451,6 +453,33 @@ void main() {
     ).decoration as BoxDecoration;
     expect(decoration.color, isSameColorAs(CupertinoColors.systemBlue.darkColor));
   });
+
+  testWidgets('Hovering over Cupertino button updates cursor to clickable on Web', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      CupertinoApp(
+        home: Center(
+          child: CupertinoButton.filled(
+            onPressed: () { },
+            child: const Text('Tap me'),
+          ),
+        ),
+      ),
+    );
+
+    final TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse, pointer: 1);
+    await gesture.addPointer(location: const Offset(10, 10));
+    await tester.pumpAndSettle();
+    expect(RendererBinding.instance.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.basic);
+
+    final Offset button = tester.getCenter(find.byType(CupertinoButton));
+    await gesture.moveTo(button);
+    addTearDown(gesture.removePointer);
+    await tester.pumpAndSettle();
+    expect(
+      RendererBinding.instance.mouseTracker.debugDeviceActiveCursor(1),
+      kIsWeb ? SystemMouseCursors.click : SystemMouseCursors.basic,
+    );
+  });
 }
 
 Widget boilerplate({ required Widget child }) {