Add splashRadius to PopupMenuButton (#91148)

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

@@ -985,6 +985,7 @@ class PopupMenuButton<T> extends StatefulWidget {
     this.elevation,
     this.padding = const EdgeInsets.all(8.0),
     this.child,
+    this.splashRadius,
     this.icon,
     this.iconSize,
     this.offset = Offset.zero,
@@ -1035,6 +1036,11 @@ class PopupMenuButton<T> extends StatefulWidget {
   /// to set the padding to zero.
   final EdgeInsetsGeometry padding;
 
+  /// The splash radius.
+  ///
+  /// If null, default splash radius of [InkWell] or [IconButton] is used.
+  final double? splashRadius;
+
   /// If provided, [child] is the widget used for this button
   /// and the button will utilize an [InkWell] for taps.
   final Widget? child;
@@ -1169,6 +1175,7 @@ class PopupMenuButtonState<T> extends State<PopupMenuButton<T>> {
         child: InkWell(
           onTap: widget.enabled ? showButtonMenu : null,
           canRequestFocus: _canRequestFocus,
+          radius: widget.splashRadius,
           enableFeedback: enableFeedback,
           child: widget.child,
         ),
@@ -1177,6 +1184,7 @@ class PopupMenuButtonState<T> extends State<PopupMenuButton<T>> {
     return IconButton(
       icon: widget.icon ?? Icon(Icons.adaptive.more),
       padding: widget.padding,
+      splashRadius: widget.splashRadius,
       iconSize: widget.iconSize ?? 24.0,
       tooltip: widget.tooltip ?? MaterialLocalizations.of(context).showMenuTooltip,
       onPressed: widget.enabled ? showButtonMenu : null,

packages/flutter/test/material/popup_menu_test.dart

@@ -2479,6 +2479,63 @@ void main() {
     // The 8.0 pixels is [_kMenuScreenPadding].
     expect(popupMenu, const Offset(8.0, 50.0));
   });
+
+  testWidgets('PopupMenuButton custom splash radius', (WidgetTester tester) async {
+    Future<void> buildFrameWithoutChild({double? splashRadius}) {
+      return tester.pumpWidget(
+        MaterialApp(
+          home: Scaffold(
+            body: Center(
+              child: PopupMenuButton<String>(
+                splashRadius: splashRadius,
+                itemBuilder: (_) => <PopupMenuEntry<String>>[
+                  const PopupMenuItem<String>(
+                    value: 'value',
+                    child: Text('child'),
+                  ),
+                ],
+              ),
+            ),
+          ),
+        ),
+      );
+    }
+
+    Future<void> buildFrameWithChild({double? splashRadius}) {
+      return tester.pumpWidget(
+        MaterialApp(
+          home: Scaffold(
+            body: Center(
+              child: PopupMenuButton<String>(
+                splashRadius: splashRadius,
+                child: const Text('An item'),
+                itemBuilder: (_) => <PopupMenuEntry<String>>[
+                  const PopupMenuDivider()
+                ],
+              ),
+            ),
+          ),
+        ),
+      );
+    }
+
+
+    await buildFrameWithoutChild();
+    expect(tester.widget<InkResponse>(find.byType(InkResponse)).radius,
+        Material.defaultSplashRadius);
+    await buildFrameWithChild();
+    expect(tester.widget<InkWell>(find.byType(InkWell)).radius, null);
+
+
+    const double testSplashRadius = 50;
+
+    await buildFrameWithoutChild(splashRadius: testSplashRadius);
+    expect(tester.widget<InkResponse>(find.byType(InkResponse)).radius,
+        testSplashRadius);
+    await buildFrameWithChild(splashRadius: testSplashRadius);
+    expect(tester.widget<InkWell>(find.byType(InkWell)).radius,
+        testSplashRadius);
+  });
 }
 
 class TestApp extends StatefulWidget {