fluffychat/lib/views/widgets/connection_status_header.dart

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import 'dart:async';
import 'package:flutter/material.dart';
import 'matrix.dart';
class ConnectionStatusHeader extends StatefulWidget {
@override
_ConnectionStatusHeaderState createState() => _ConnectionStatusHeaderState();
}
class _ConnectionStatusHeaderState extends State<ConnectionStatusHeader> {
StreamSubscription _onSyncSub;
StreamSubscription _onSyncErrorSub;
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static bool _connected = true;
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set connected(bool connected) {
if (mounted) {
setState(() => _connected = connected);
}
}
@override
void dispose() {
_onSyncSub?.cancel();
_onSyncErrorSub?.cancel();
super.dispose();
}
@override
Widget build(BuildContext context) {
_onSyncSub ??= Matrix.of(context).client.onSync.stream.listen(
(_) => connected = true,
);
_onSyncErrorSub ??= Matrix.of(context).client.onSyncError.stream.listen(
(_) => connected = false,
);
return AnimatedContainer(
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duration: Duration(milliseconds: 300),
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height: _connected ? 0 : 5,
child: LinearProgressIndicator(),
);
}
}