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Pause polling when screens are off-route or app is backgrounded

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PolledValue gains pause()/resume() methods. ScannersStatusCard and
NotificationsList now implement RouteAware (didPushNext/didPopNext)
and WidgetsBindingObserver to stop API calls and tick timers when
the widget is not visible, resuming with an immediate fetch on return.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
rzuasti
2026-05-31 17:34:19 -04:00
co-authored by Claude Sonnet 4.6
parent 838b292456
commit f75d1ce313
3 changed files with 94 additions and 6 deletions
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frontend/lib/widgets/scanners_status_card.dart
+49 -1
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@@ -5,6 +5,7 @@ import 'package:go_router/go_router.dart';
import '../model/arp_scanner_status.dart';
import '../model/mdns_scanner_status.dart';
import '../navigation.dart';
import '../utils/duration_formatter.dart';
import '../utils/oott_api.dart';
import '../utils/polled_value.dart';
@@ -17,7 +18,8 @@ class ScannersStatusCard extends StatefulWidget {
State<ScannersStatusCard> createState() => _ScannersStatusCardState();
}
class _ScannersStatusCardState extends State<ScannersStatusCard> {
class _ScannersStatusCardState extends State<ScannersStatusCard>
with RouteAware, WidgetsBindingObserver {
late final PolledValue<ArpScannerStatus> _arp;
late final PolledValue<MdnsScannerStatus> _mdns;
Timer? _tickTimer;
@@ -25,6 +27,7 @@ class _ScannersStatusCardState extends State<ScannersStatusCard> {
@override
void initState() {
super.initState();
WidgetsBinding.instance.addObserver(this);
_arp = PolledValue<ArpScannerStatus>(
fetch: ({cancelToken}) =>
BackendAPI.instance.getArpScannerStatus(cancelToken: cancelToken),
@@ -42,8 +45,53 @@ class _ScannersStatusCardState extends State<ScannersStatusCard> {
});
}
@override
void didChangeDependencies() {
super.didChangeDependencies();
final route = ModalRoute.of(context);
if (route is ModalRoute<void>) {
routeObserver.subscribe(this, route);
}
}
@override
void didPushNext() {
_pausePolling();
}
@override
void didPopNext() {
_resumePolling();
}
@override
void didChangeAppLifecycleState(AppLifecycleState state) {
if (state == AppLifecycleState.paused) {
_pausePolling();
} else if (state == AppLifecycleState.resumed) {
_resumePolling();
}
}
void _pausePolling() {
_arp.pause();
_mdns.pause();
_tickTimer?.cancel();
_tickTimer = null;
}
void _resumePolling() {
_arp.resume();
_mdns.resume();
_tickTimer ??= Timer.periodic(const Duration(seconds: 1), (_) {
if (mounted) setState(() {});
});
}
@override
void dispose() {
WidgetsBinding.instance.removeObserver(this);
routeObserver.unsubscribe(this);
_tickTimer?.cancel();
_arp.dispose();
_mdns.dispose();