fluffychat/lib/widgets/unread_badge_back_button.dart

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import 'package:matrix/matrix.dart';
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import 'package:flutter/material.dart';
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import '../config/app_config.dart';
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import 'matrix.dart';
class UnreadBadgeBackButton extends StatelessWidget {
final String roomId;
const UnreadBadgeBackButton({
Key key,
@required this.roomId,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return Stack(
children: [
Center(child: BackButton()),
StreamBuilder(
stream: Matrix.of(context).client.onSync.stream,
builder: (context, _) {
final unreadCount = Matrix.of(context)
.client
.rooms
.where((r) =>
r.id != roomId &&
(r.isUnread || r.membership == Membership.invite))
.length;
return unreadCount > 0
? Align(
alignment: Alignment.bottomRight,
child: Container(
padding: EdgeInsets.all(4),
margin: EdgeInsets.only(bottom: 4, right: 8),
decoration: BoxDecoration(
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color: Theme.of(context).primaryColor,
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borderRadius:
BorderRadius.circular(AppConfig.borderRadius),
),
child: Text(
'$unreadCount',
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style: TextStyle(
fontSize: 12,
color: Colors.white,
),
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),
),
)
: Container();
}),
],
);
}
}