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A firebase & ListTile implementation that disables the tile within onTap during a transaction
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import 'package:baby_names/my_list_tile.dart'; | |
import 'package:flutter/material.dart'; | |
import 'package:cloud_firestore/cloud_firestore.dart'; | |
void main() => runApp(MyApp()); | |
class MyApp extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
return MaterialApp( | |
title: 'Baby Names', | |
theme: ThemeData( | |
primarySwatch: Colors.blue, | |
), | |
home: MyHomePage(title: 'Baby Names Codelabs'), | |
); | |
} | |
} | |
class MyHomePage extends StatefulWidget { | |
MyHomePage({Key key, this.title}) : super(key: key); | |
final String title; | |
@override | |
_MyHomePageState createState() => _MyHomePageState(); | |
} | |
class _MyHomePageState extends State<MyHomePage> { | |
List<Record> _items = new List<Record>(); | |
Map<String, bool> eState = new Map<String, bool>(); | |
_MyHomePageState() { | |
Firestore.instance.collection('baby').snapshots().listen((data) { | |
_items.removeRange(0, _items.length); | |
setState(() { | |
data.documents.forEach((doc) => _items.add(Record.fromSnapshot(doc))); | |
}); | |
}); | |
} | |
@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
appBar: AppBar( | |
title: Text(widget.title), | |
), | |
body: ListView.builder( | |
padding: const EdgeInsets.only(top: 20.0), | |
itemCount: _items.length, | |
itemBuilder: (context, index) => _buildListItem(context, index))); | |
} | |
Widget _buildListItem(BuildContext context, int index) { | |
var record = _items[index]; | |
var e = eState[record.name] == null ? true : eState[record.name]; | |
return Padding( | |
key: ValueKey(record.name), | |
padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8.0), | |
child: Container( | |
decoration: BoxDecoration( | |
border: Border.all(color: Colors.grey), | |
borderRadius: BorderRadius.circular(5.0), | |
), | |
child: ListTile( | |
title: Text(record.name), | |
trailing: Text(record.votes.toString()), | |
enabled: e, | |
onTap: () => | |
Firestore.instance.runTransaction((transaction) async { | |
setState(() { | |
eState[record.name] = false; | |
}); | |
final freshSnapshot = | |
await transaction.get(record.reference); | |
final fresh = Record.fromSnapshot(freshSnapshot); | |
await transaction | |
.update(record.reference, {'votes': fresh.votes + 1}); | |
setState(() { | |
eState[record.name] = true; | |
}); | |
})), | |
)); | |
} | |
} | |
class Record { | |
final String name; | |
final int votes; | |
final DocumentReference reference; | |
Record.fromMap(Map<String, dynamic> map, {this.reference}) | |
: assert(map['name'] != null), | |
assert(map['votes'] != null), | |
name = map['name'], | |
votes = map['votes']; | |
Record.fromSnapshot(DocumentSnapshot snapshot) | |
: this.fromMap(snapshot.data, reference: snapshot.reference); | |
@override | |
String toString() => "Record<$name:$votes>"; | |
} |
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A tiny improvement on the firebase flutter codelab
https://codelabs.developers.google.com/codelabs/flutter-firebase/#0