diff --git a/packages/firebase_database/example/lib/main.dart b/packages/firebase_database/example/lib/main.dart index ebadd96..23846fa 100644 --- a/packages/firebase_database/example/lib/main.dart +++ b/packages/firebase_database/example/lib/main.dart @@ -1,140 +1,240 @@ -// Copyright 2022, the Chromium project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. +// Copyright 2021 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +import 'dart:async'; -import 'dart:io'; import 'package:firebase_core/firebase_core.dart'; -import 'package:flutter/foundation.dart'; +import 'package:firebase_database/firebase_database.dart'; +import 'package:firebase_database/ui/firebase_animated_list.dart'; +import 'package:flutter/foundation.dart' show defaultTargetPlatform, kIsWeb; import 'package:flutter/material.dart'; + import 'firebase_options.dart'; +// Change to false to use live database instance. +const USE_DATABASE_EMULATOR = true; +// The port we've set the Firebase Database emulator to run on via the +// `firebase.json` configuration file. +const emulatorPort = 9000; +// Android device emulators consider localhost of the host machine as 10.0.2.2 +// so let's use that if running on Android. +final emulatorHost = + (!kIsWeb && defaultTargetPlatform == TargetPlatform.android) + ? '10.0.2.2' + : 'localhost'; + Future main() async { WidgetsFlutterBinding.ensureInitialized(); await Firebase.initializeApp( options: DefaultFirebaseOptions.currentPlatform, ); - runApp(const MyApp()); + + if (USE_DATABASE_EMULATOR) { + FirebaseDatabase.instance.useDatabaseEmulator(emulatorHost, emulatorPort); + } + + runApp( + const MaterialApp( + title: 'Flutter Database Example', + home: MyHomePage(), + ), + ); } -class MyApp extends StatelessWidget { - const MyApp({Key? key}) : super(key: key); +class MyHomePage extends StatefulWidget { + const MyHomePage({Key? key}) : super(key: key); - // This widget is the root of your application. @override - Widget build(BuildContext context) { - return MaterialApp( - title: 'Flutter Demo', - theme: ThemeData( - // This is the theme of your application. - // - // Try running your application with "flutter run". You'll see the - // application has a blue toolbar. Then, without quitting the app, try - // changing the primarySwatch below to Colors.green and then invoke - // "hot reload" (press "r" in the console where you ran "flutter run", - // or simply save your changes to "hot reload" in a Flutter IDE). - // Notice that the counter didn't reset back to zero; the application - // is not restarted. - primarySwatch: Colors.blue, - ), - home: const MyHomePage(title: 'Flutter Demo Home Page'), - ); - } + _MyHomePageState createState() => _MyHomePageState(); } -class MyHomePage extends StatefulWidget { - const MyHomePage({Key? key, required this.title}) : super(key: key); +class _MyHomePageState extends State { + int _counter = 0; + late DatabaseReference _counterRef; + late DatabaseReference _messagesRef; + late StreamSubscription _counterSubscription; + late StreamSubscription _messagesSubscription; + bool _anchorToBottom = false; + + String _kTestKey = 'Hello'; + String _kTestValue = 'world!'; + FirebaseException? _error; + bool initialized = false; + + @override + void initState() { + init(); + super.initState(); + } - // This widget is the home page of your application. It is stateful, meaning - // that it has a State object (defined below) that contains fields that affect - // how it looks. + Future init() async { + _counterRef = FirebaseDatabase.instance.ref('counter'); - // This class is the configuration for the state. It holds the values (in this - // case the title) provided by the parent (in this case the App widget) and - // used by the build method of the State. Fields in a Widget subclass are - // always marked "final". + final database = FirebaseDatabase.instance; - final String title; + _messagesRef = database.ref('messages'); + + database.setLoggingEnabled(false); + + if (!kIsWeb) { + database.setPersistenceEnabled(true); + database.setPersistenceCacheSizeBytes(10000000); + } + + if (!kIsWeb) { + await _counterRef.keepSynced(true); + } + + setState(() { + initialized = true; + }); + + try { + final counterSnapshot = await _counterRef.get(); + + print( + 'Connected to directly configured database and read ' + '${counterSnapshot.value}', + ); + } catch (err) { + print(err); + } + + _counterSubscription = _counterRef.onValue.listen( + (DatabaseEvent event) { + setState(() { + _error = null; + _counter = (event.snapshot.value ?? 0) as int; + }); + }, + onError: (Object o) { + final error = o as FirebaseException; + setState(() { + _error = error; + }); + }, + ); + + final messagesQuery = _messagesRef.limitToLast(10); + + _messagesSubscription = messagesQuery.onChildAdded.listen( + (DatabaseEvent event) { + print('Child added: ${event.snapshot.value}'); + }, + onError: (Object o) { + final error = o as FirebaseException; + print('Error: ${error.code} ${error.message}'); + }, + ); + } @override - State createState() => _MyHomePageState(); -} + void dispose() { + super.dispose(); + _messagesSubscription.cancel(); + _counterSubscription.cancel(); + } -class _MyHomePageState extends State { - int _counter = 0; + Future _increment() async { + await _counterRef.set(ServerValue.increment(1)); + + await _messagesRef + .push() + .set({_kTestKey: '$_kTestValue $_counter'}); + } + + Future _incrementAsTransaction() async { + try { + final transactionResult = await _counterRef.runTransaction((mutableData) { + return Transaction.success((mutableData as int? ?? 0) + 1); + }); + + if (transactionResult.committed) { + final newMessageRef = _messagesRef.push(); + await newMessageRef.set({ + _kTestKey: '$_kTestValue ${transactionResult.snapshot.value}' + }); + } + } on FirebaseException catch (e) { + print(e.message); + } + } + + Future _deleteMessage(DataSnapshot snapshot) async { + final messageRef = _messagesRef.child(snapshot.key!); + await messageRef.remove(); + } + + void _setAnchorToBottom(bool? value) { + if (value == null) { + return; + } - void _incrementCounter() { setState(() { - // This call to setState tells the Flutter framework that something has - // changed in this State, which causes it to rerun the build method below - // so that the display can reflect the updated values. If we changed - // _counter without calling setState(), then the build method would not be - // called again, and so nothing would appear to happen. - _counter++; + _anchorToBottom = value; }); } @override Widget build(BuildContext context) { - // This method is rerun every time setState is called, for instance as done - // by the _incrementCounter method above. - // - // The Flutter framework has been optimized to make rerunning build methods - // fast, so that you can just rebuild anything that needs updating rather - // than having to individually change instances of widgets. + if (!initialized) return Container(); + return Scaffold( appBar: AppBar( - // Here we take the value from the MyHomePage object that was created by - // the App.build method, and use it to set our appbar title. - title: Text(widget.title), + title: const Text('Flutter Database Example'), ), - body: Center( - // Center is a layout widget. It takes a single child and positions it - // in the middle of the parent. - child: Column( - // Column is also a layout widget. It takes a list of children and - // arranges them vertically. By default, it sizes itself to fit its - // children horizontally, and tries to be as tall as its parent. - // - // Invoke "debug painting" (press "p" in the console, choose the - // "Toggle Debug Paint" action from the Flutter Inspector in Android - // Studio, or the "Toggle Debug Paint" command in Visual Studio Code) - // to see the wireframe for each widget. - // - // Column has various properties to control how it sizes itself and - // how it positions its children. Here we use mainAxisAlignment to - // center the children vertically; the main axis here is the vertical - // axis because Columns are vertical (the cross axis would be - // horizontal). - mainAxisAlignment: MainAxisAlignment.center, - children: [ - ElevatedButton( - onPressed: () async { - // Running these APIs manually as they're failing on CI due to required keychain sharing entitlements - // See this issue https://github.com/firebase/flutterfire/issues/9538 - // You will also need to add the keychain sharing entitlements to this test app and sign code with development team for app & tests to successfully run - if (Platform.isMacOS && kDebugMode) { - // ignore_for_file: avoid_print - // Wait a little so we don't get a delete-pending exception - await Future.delayed(const Duration(seconds: 8)); - } - }, - child: const Text('Test macOS tests manually'), + body: Column( + children: [ + Flexible( + child: Center( + child: _error == null + ? Text( + 'Button tapped $_counter time${_counter == 1 ? '' : 's'}.\n\n' + 'This includes all devices, ever.', + ) + : Text( + 'Error retrieving button tap count:\n${_error!.message}', + ), ), - const Text( - 'You have pushed the button this many times:', + ), + ElevatedButton( + onPressed: _incrementAsTransaction, + child: const Text('Increment as transaction'), + ), + ListTile( + leading: Checkbox( + onChanged: _setAnchorToBottom, + value: _anchorToBottom, ), - Text( - '$_counter', - style: Theme.of(context).textTheme.headline4, + title: const Text('Anchor to bottom'), + ), + Flexible( + child: FirebaseAnimatedList( + key: ValueKey(_anchorToBottom), + query: _messagesRef, + reverse: _anchorToBottom, + itemBuilder: (context, snapshot, animation, index) { + return SizeTransition( + sizeFactor: animation, + child: ListTile( + trailing: IconButton( + onPressed: () => _deleteMessage(snapshot), + icon: const Icon(Icons.delete), + ), + title: Text('$index: ${snapshot.value.toString()}'), + ), + ); + }, ), - ], - ), + ), + ], ), floatingActionButton: FloatingActionButton( - onPressed: _incrementCounter, + onPressed: _increment, tooltip: 'Increment', child: const Icon(Icons.add), - ), // This trailing comma makes auto-formatting nicer for build methods. + ), ); } } diff --git a/packages/firebase_database/example/pubspec.yaml b/packages/firebase_database/example/pubspec.yaml index 4186081..5db0b4e 100644 --- a/packages/firebase_database/example/pubspec.yaml +++ b/packages/firebase_database/example/pubspec.yaml @@ -8,15 +8,14 @@ dependencies: firebase_core: 2.4.1 firebase_core_tizen: ^1.0.0 firebase_database: 10.0.9 - firebase_database_tizen: ^0.1.0 + firebase_database_tizen: + path: .. flutter: sdk: flutter dependency_overrides: firebase_core_tizen: path: ../../firebase_core - firebase_database_tizen: - path: .. dev_dependencies: flutter_test: