new: picker & opt. rm -r

lib/view/widget/choice_chip.dart

@@ -0,0 +1,29 @@
+import 'package:choice/selection.dart';
+import 'package:flutter/material.dart';
+
+class ChoiceChipX<T> extends StatelessWidget {
+  const ChoiceChipX({
+    Key? key,
+    required this.label,
+    required this.state,
+    required this.value,
+  }) : super(key: key);
+
+  final String label;
+  final ChoiceController<T> state;
+  final T value;
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.all(3),
+      child: ChoiceChip(
+        label: Text(label),
+        side: BorderSide.none,
+        selected: state.selected(value),
+        selectedColor: Theme.of(context).colorScheme.primary,
+        onSelected: state.onSelected(value),
+      ),
+    );
+  }
+}