add length picker

lib/pages/widgets/local_radio_buttons.dart

@@ -0,0 +1,41 @@
+import 'package:fcs/helpers/theme.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+class LocalRadioButtons<T> extends StatelessWidget {
+  final Function(T) callback;
+  final IconData iconData;
+  final T selectedValue;
+  final List<T> values;
+
+  const LocalRadioButtons(
+      {Key key, this.callback, this.iconData, this.selectedValue, this.values})
+      : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(children: getChildren());
+  }
+
+  List<Widget> getChildren() {
+    return values
+        .toList()
+        .map((e) => SizedBox(
+            height: 30,
+            child: InkWell(
+              onTap: () => callback(e),
+              child: Row(children: <Widget>[
+                Radio<T>(
+                  activeColor: primaryColor,
+                  groupValue: selectedValue,
+                  value: e,
+                  onChanged: (T value) {
+                    callback(value);
+                  },
+                ),
+                Text(e.toString()),
+              ]),
+            )))
+        .toList();
+  }
+}