Fix language selector design

lib/view/components/search/LanguageSelector.dart

@@ -2,19 +2,14 @@
 import 'package:flutter/material.dart';
 
 class LanguageSelector extends StatefulWidget {
-  final List<String> _languages;
 
-  LanguageSelector(this._languages);
 
   @override
-  LanguageSelectorState createState() => new LanguageSelectorState(this._languages);
+  LanguageSelectorState createState() => new LanguageSelectorState();
 }
 
 class LanguageSelectorState extends State<LanguageSelector> {
-  final List<String> _languages;
-  List<bool> isSelected = [true, false, false];
-
-  LanguageSelectorState(this._languages);
+  List<bool> isSelected;
 
   @override
   void initState() {
@@ -25,12 +20,20 @@ class LanguageSelectorState extends State<LanguageSelector> {
   @override
   Widget build(BuildContext context) {
     return ToggleButtons(
-      children: <Widget>[
+      isSelected: isSelected,
+      children: <Widget> [
         LanguageOption("Auto"),
         LanguageOption("Japanese"),
         LanguageOption("English")
       ],
-      isSelected: isSelected
+      selectedColor: Colors.blue,
+      onPressed: (int buttonIndex) {
+        setState(() {
+          for (var i in Iterable.generate(isSelected.length)) {
+            isSelected[i] = i == buttonIndex;
+          }
+        });
+      },
     );
   }
 
@@ -45,14 +48,8 @@ class LanguageOption extends StatelessWidget {
   Widget build(BuildContext context) {
     return Expanded(
       child: Container(
-        padding: EdgeInsets.symmetric(vertical: 10.0),
+        padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 20.0),
         child: Center(child: Text(_language)),
-        decoration: BoxDecoration(
-            border: Border.all(
-              color: Colors.black,
-              width: 1.0,
-            ),
-            color: Colors.white),
       ),
     );
   }

lib/view/screens/search.dart

@@ -68,7 +68,7 @@ class SearchBar extends StatelessWidget {
           SizedBox(
             height: 10.0,
           ),
-          LanguageSelector(["Auto", "Japanese", "English"])
+          LanguageSelector()
         ],
       ),
     );