MessageListCore
A Widget For Building A List Of Messages
Find the pub.dev documentation here
#
BackgroundThe UI SDK of Stream Chat supplies a MessageListView
class that builds a list of channels fetching
according to the filters and sort order given. However, in some cases, implementing novel UI is necessary
that cannot be done using the customization approaches given in the widget.
To do this, we extracted the logic required for fetching channels into a 'Core' widget - a widget that fetches channels in the expected way via the usual params but does not supply any UI and instead exposes builders to build the UI in situations such as loading, empty data, errors, and on data received.
#
Basic ExampleMessageListCore
is a simplified class that allows fetching a list of
messages while exposing UI builders.
This allows you to construct your own UI while not having to worry about the specific logic of fetching messages in a channel.
A MessageListController
is used to paginate data.
class ChannelPage extends StatelessWidget {
const ChannelPage({
Key key,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
children: <Widget>[
Expanded(
child: MessageListCore(
emptyBuilder: (context) {
return Center(
child: Text('Nothing here...'),
);
},
loadingBuilder: (context) {
return Center(
child: CircularProgressIndicator(),
);
},
messageListBuilder: (context, list) {
return MessagesPage(list);
},
errorWidgetBuilder: (context, err) {
return Center(
child: Text('Error'),
);
},
),
),
],
),
);
}
}
Make sure to have a StreamChannel
ancestor in order to provide the
information about the channels.