State Restoration support for Veggie Seasons app (#433)

veggieseasons/lib/screens/search.dart

@@ -1,105 +0,0 @@
-// Copyright 2018 The Flutter team. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import 'package:flutter/cupertino.dart';
-import 'package:flutter/widgets.dart';
-import 'package:provider/provider.dart';
-import 'package:veggieseasons/data/app_state.dart';
-import 'package:veggieseasons/data/veggie.dart';
-import 'package:veggieseasons/styles.dart';
-import 'package:veggieseasons/widgets/search_bar.dart';
-import 'package:veggieseasons/widgets/veggie_headline.dart';
-
-class SearchScreen extends StatefulWidget {
-  @override
-  _SearchScreenState createState() => _SearchScreenState();
-}
-
-class _SearchScreenState extends State<SearchScreen> {
-  final controller = TextEditingController();
-  final focusNode = FocusNode();
-  String terms = '';
-
-  @override
-  void initState() {
-    super.initState();
-    controller.addListener(_onTextChanged);
-  }
-
-  @override
-  void dispose() {
-    focusNode.dispose();
-    super.dispose();
-  }
-
-  void _onTextChanged() {
-    setState(() => terms = controller.text);
-  }
-
-  Widget _createSearchBox() {
-    return Padding(
-      padding: const EdgeInsets.all(8),
-      child: SearchBar(
-        controller: controller,
-        focusNode: focusNode,
-      ),
-    );
-  }
-
-  Widget _buildSearchResults(List<Veggie> veggies) {
-    if (veggies.isEmpty) {
-      return Center(
-        child: Padding(
-          padding: const EdgeInsets.symmetric(horizontal: 24),
-          child: Text(
-            'No veggies matching your search terms were found.',
-            style: Styles.headlineDescription(CupertinoTheme.of(context)),
-          ),
-        ),
-      );
-    }
-
-    return ListView.builder(
-      itemCount: veggies.length + 1,
-      itemBuilder: (context, i) {
-        if (i == 0) {
-          return Visibility(
-            // This invisible and otherwise unnecessary search box is used to
-            // pad the list entries downward, so none will be underneath the
-            // real search box when the list is at its top scroll position.
-            child: _createSearchBox(),
-            visible: false,
-            maintainSize: true,
-            maintainAnimation: true,
-            maintainState: true,
-          );
-        } else {
-          return Padding(
-            padding: EdgeInsets.only(left: 16, right: 16, bottom: 24),
-            child: VeggieHeadline(veggies[i - 1]),
-          );
-        }
-      },
-    );
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    final model = Provider.of<AppState>(context);
-
-    return CupertinoTabView(
-      builder: (context) {
-        return SafeArea(
-          bottom: false,
-          child: Stack(
-            children: [
-              _buildSearchResults(model.searchVeggies(terms)),
-              _createSearchBox(),
-            ],
-          ),
-        );
-      },
-    );
-  }
-}