import 'package:matrix/matrix.dart'; import 'package:flutter/material.dart'; import '../config/app_config.dart'; 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( color: Theme.of(context).primaryColor, borderRadius: BorderRadius.circular(AppConfig.borderRadius), ), child: Text( '$unreadCount', style: TextStyle( fontSize: 12, color: Colors.white, ), ), ), ) : Container(); }), ], ); } }