Implement CheckmarkableChipAttributes on ChoiceChip (#124743)

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

@@ -275,6 +275,8 @@ abstract interface class DeletableChipAttributes {
 ///  * [InputChip], a chip that represents a complex piece of information, such
 ///    as an entity (person, place, or thing) or conversational text, in a
 ///    compact form.
+///  * [ChoiceChip], allows a single selection from a set of options. Choice
+///    chips contain related descriptive text or categories.
 ///  * [FilterChip], uses tags or descriptive words as a way to filter content.
 ///  * <https://material.io/design/components/chips.html>
 abstract interface class CheckmarkableChipAttributes {

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

@@ -52,6 +52,7 @@ class ChoiceChip extends StatelessWidget
     implements
         ChipAttributes,
         SelectableChipAttributes,
+        CheckmarkableChipAttributes,
         DisabledChipAttributes {
   /// Create a chip that acts like a radio button.
   ///
@@ -84,6 +85,8 @@ class ChoiceChip extends StatelessWidget
     this.surfaceTintColor,
     this.iconTheme,
     this.selectedShadowColor,
+    this.showCheckmark,
+    this.checkmarkColor,
     this.avatarBorder = const CircleBorder(),
   }) : assert(pressElevation == null || pressElevation >= 0.0),
        assert(elevation == null || elevation >= 0.0);
@@ -135,6 +138,10 @@ class ChoiceChip extends StatelessWidget
   @override
   final Color? selectedShadowColor;
   @override
+  final bool? showCheckmark;
+  @override
+  final Color? checkmarkColor;
+  @override
   final ShapeBorder avatarBorder;
   @override
   final IconThemeData? iconTheme;
@@ -158,7 +165,8 @@ class ChoiceChip extends StatelessWidget
       onSelected: onSelected,
       pressElevation: pressElevation,
       selected: selected,
-      showCheckmark: Theme.of(context).useMaterial3,
+      showCheckmark: showCheckmark ?? chipTheme.showCheckmark ?? Theme.of(context).useMaterial3,
+      checkmarkColor: checkmarkColor,
       tooltip: tooltip,
       side: side,
       shape: shape,

packages/flutter/test/material/choice_chip_test.dart

@@ -132,4 +132,35 @@ void main() {
     final RawChip rawChip = tester.widget(find.byType(RawChip));
     expect(rawChip.iconTheme, iconTheme);
   });
+
+  testWidgets('ChoiceChip passes showCheckmark from ChipTheme to RawChip', (WidgetTester tester) async {
+    const bool showCheckmark = false;
+    await tester.pumpWidget(wrapForChip(
+        child: const ChipTheme(
+          data: ChipThemeData(
+            showCheckmark: showCheckmark,
+          ),
+          child: ChoiceChip(
+            label: Text('Test'),
+            selected: true,
+          ),
+        )));
+    final RawChip rawChip = tester.widget(find.byType(RawChip));
+    expect(rawChip.showCheckmark, showCheckmark);
+  });
+
+  testWidgets('ChoiceChip passes checkmark properties to RawChip', (WidgetTester tester) async {
+    const bool showCheckmark = false;
+    const Color checkmarkColor = Color(0xff0000ff);
+    await tester.pumpWidget(wrapForChip(
+      child: const ChoiceChip(
+        label: Text('Test'),
+        selected: true,
+        showCheckmark: showCheckmark,
+        checkmarkColor: checkmarkColor,
+    )));
+    final RawChip rawChip = tester.widget(find.byType(RawChip));
+    expect(rawChip.showCheckmark, showCheckmark);
+    expect(rawChip.checkmarkColor, checkmarkColor);
+  });
 }