rename package folders
This commit is contained in:
Salvatore Giordano
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import 'package:flutter/material.dart';
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import 'package:stream_chat/stream_chat.dart';
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Future<void> main() async {
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/// Create a new instance of [StreamChatClient] passing the apikey obtained from your
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/// project dashboard.
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final client = StreamChatClient('b67pax5b2wdq');
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/// Set the current user. In a production scenario, this should be done using
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/// a backend to generate a user token using our server SDK.
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/// Please see the following for more information:
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/// https://getstream.io/chat/docs/ios_user_setup_and_tokens/
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await client.setUser(
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User(
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id: 'cool-shadow-7',
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extraData: {
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'image':
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'https://getstream.io/random_png/?id=cool-shadow-7&name=Cool+shadow',
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},
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),
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'eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjoiY29vbC1zaGFkb3ctNyJ9.gkOlCRb1qgy4joHPaxFwPOdXcGvSPvp6QY0S4mpRkVo',
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);
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/// Creates a channel using the type `messaging` and `godevs`.
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/// Channels are containers for holding messages between different members. To
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/// learn more about channels and some of our predefined types, checkout our
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/// our channel docs: https://getstream.io/chat/docs/initialize_channel/?language=dart
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final channel = client.channel('messaging', id: 'godevs');
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/// `.watch()` is used to create and listen to the channel for updates. If the
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/// channel already exists, it will simply listen for new events.
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await channel.watch();
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runApp(
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StreamExample(
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client: client,
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channel: channel,
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),
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);
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}
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/// Example using Stream's Low Level Dart client.
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class StreamExample extends StatelessWidget {
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/// To initialize this example, an instance of [client] and [channel] is required.
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const StreamExample({
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Key key,
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@required this.client,
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@required this.channel,
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}) : super(key: key);
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/// Instance of [StreamChatClient] we created earlier. This contains information about
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/// our application and connection state.
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final StreamChatClient client;
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/// The channel we'd like to observe and participate.
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final Channel channel;
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: 'Stream Chat Dart Example',
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home: HomeScreen(channel: channel),
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);
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}
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}
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/// Main screen of our application. The layout is comprised of an [AppBar]
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/// containing the channel name and a [MessageView] displaying recent messages.
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class HomeScreen extends StatelessWidget {
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/// [HomeScreen] is constructed using the [Channel] we defined earlier.
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const HomeScreen({Key key, @required this.channel}) : super(key: key);
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/// Channel object containing the [Channel.id] we'd like to observe.
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final Channel channel;
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@override
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Widget build(BuildContext context) {
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final messages = channel.state.channelStateStream;
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return Scaffold(
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appBar: AppBar(
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title: Text('Channel: ${channel.id}'),
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),
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body: SafeArea(
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child: StreamBuilder<ChannelState>(
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stream: messages,
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builder: (
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BuildContext context,
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AsyncSnapshot<ChannelState> snapshot,
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) {
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if (snapshot.hasData && snapshot.data != null) {
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return MessageView(
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messages: snapshot.data.messages.reversed.toList(),
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channel: channel,
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);
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} else if (snapshot.hasError) {
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return const Center(
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child: Text(
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'There was an error loading messages. Please see logs.',
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),
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);
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}
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return const Center(
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child: SizedBox(
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width: 100.0,
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height: 100.0,
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child: CircularProgressIndicator(),
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),
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);
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},
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),
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),
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);
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}
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}
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/// UI used to display a list of recent messages and a [TextField] for sending
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/// new messages.
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class MessageView extends StatefulWidget {
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/// Message takes the latest list of messages and the current channel.
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const MessageView({
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Key key,
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@required this.messages,
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@required this.channel,
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}) : super(key: key);
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/// List of messages sent in the given channel.
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final List<Message> messages;
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/// Current channel being observed.
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final Channel channel;
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@override
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_MessageViewState createState() => _MessageViewState();
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}
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class _MessageViewState extends State<MessageView> {
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TextEditingController _controller;
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ScrollController _scrollController;
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List<Message> get _messages => widget.messages;
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@override
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void initState() {
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super.initState();
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_controller = TextEditingController();
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_scrollController = ScrollController();
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}
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@override
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void dispose() {
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_controller.dispose();
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_scrollController.dispose();
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super.dispose();
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}
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/// Convenience method for scrolling the list view when a new message is sent.
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void _updateList() {
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_scrollController.animateTo(
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0,
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duration: const Duration(milliseconds: 200),
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curve: Curves.easeOut,
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);
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}
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@override
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Widget build(BuildContext context) {
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return Column(
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children: [
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Expanded(
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child: ListView.builder(
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controller: _scrollController,
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itemCount: _messages.length,
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reverse: true,
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itemBuilder: (BuildContext context, int index) {
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final item = _messages[index];
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if (item.user.id == widget.channel.client.uid) {
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return Align(
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alignment: Alignment.centerRight,
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child: Padding(
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padding: const EdgeInsets.all(8.0),
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child: Text(item.text),
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),
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);
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} else {
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return Align(
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alignment: Alignment.centerLeft,
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child: Padding(
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padding: const EdgeInsets.all(8.0),
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child: Text(item.text),
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),
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);
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}
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},
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),
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),
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Padding(
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padding: const EdgeInsets.all(8.0),
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child: Row(
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children: [
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Expanded(
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child: TextField(
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controller: _controller,
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decoration: const InputDecoration(
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hintText: 'Enter your message',
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),
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),
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),
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Material(
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type: MaterialType.circle,
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color: Colors.blue,
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clipBehavior: Clip.hardEdge,
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child: InkWell(
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onTap: () async {
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// We can send a new message by calling `sendMessage` on
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// the current channel. After sending a message, the
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// TextField is cleared and the list view is scrolled
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// to show the new item.
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if (_controller.value.text.isNotEmpty) {
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await widget.channel.sendMessage(
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Message(text: _controller.value.text),
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);
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_controller.clear();
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_updateList();
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}
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},
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child: const Padding(
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padding: EdgeInsets.all(8.0),
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child: Center(
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child: Icon(
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Icons.send,
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color: Colors.white,
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),
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),
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),
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),
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)
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],
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),
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)
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],
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);
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}
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}
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/// Helper extension for quickly retrieving the current user id from a [StreamChatClient].
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extension on StreamChatClient {
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String get uid => state.user.id;
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}
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