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samples/experimental/veggieseasons/lib/screens/search.dart

122 lines
3.4 KiB

// 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/services.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/widgets/search_bar.dart';
import 'package:veggieseasons/widgets/veggie_headline.dart';
class SearchScreen extends StatefulWidget {
SearchScreen({this.restorationId, Key key}) : super(key: key);
final String restorationId;
@override
_SearchScreenState createState() => _SearchScreenState();
}
class _SearchScreenState extends State<SearchScreen> with RestorationMixin {
final controller = RestorableTextEditingController();
final focusNode = FocusNode();
String terms;
@override
String get restorationId => widget.restorationId;
@override
void restoreState(RestorationBucket oldBucket, bool initialRestore) {
registerForRestoration(controller, 'text');
controller.addListener(_onTextChanged);
terms = controller.value.text;
}
@override
void dispose() {
focusNode.dispose();
controller.dispose();
super.dispose();
}
void _onTextChanged() {
setState(() => terms = controller.value.text);
}
Widget _createSearchBox() {
return Padding(
padding: const EdgeInsets.all(8),
child: SearchBar(
controller: controller.value,
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: CupertinoTheme.of(context).textTheme.textStyle,
),
),
);
}
return ListView.builder(
restorationId: 'list',
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 UnmanagedRestorationScope(
child: CupertinoTabView(
builder: (context) {
return AnnotatedRegion<SystemUiOverlayStyle>(
value: SystemUiOverlayStyle(
statusBarBrightness:
MediaQuery.platformBrightnessOf(context)),
child: SafeArea(
bottom: false,
child: Stack(
children: [
_buildSearchResults(model.searchVeggies(terms)),
_createSearchBox(),
],
),
));
},
),
);
}
}