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September 25, 2020 04:07
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Long Polling Stream and Need to Cancel Timer
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| // The focus on/off methods fire. I am not sure how to change the providers so that I can either force dispose or just start/stop the timer? | |
| final MyRequestProvider = | |
| StreamProvider.autoDispose<List<MyRequest>>((ref) { | |
| StreamController<List<MyRequest>> controller = | |
| StreamController<List<MyRequest>>(); | |
| ClientResolver clientResolver = ClientResolver(); | |
| IServiceClient client = clientResolver.getClient(AppParameters.getBaseUrl()); | |
| PendingMy apiRequest = PendingMy(); | |
| Timer timer = Timer.periodic(Duration(seconds: 10), (t) { | |
| client.get(apiRequest).then((data) { | |
| controller.add(data.results); | |
| }); | |
| }); | |
| ref.onDispose(() { | |
| if (timer != null && timer.isActive) { | |
| timer.cancel(); | |
| } | |
| controller.close(); | |
| }); | |
| return controller.stream; | |
| }); | |
| // using the https://pub.dev/packages/focus_detector to detect screen on / off | |
| // how do i control the timer and polling in this case? | |
| // somewhere in a build tree: | |
| FocusDetector( | |
| key: _focusDetectorKey, | |
| onFocusGained: () { | |
| }, | |
| onFocusLost: () { | |
| debugPrint('CharacterListPage lost focus'); | |
| var d = context.read(curbsideRequestProvider); | |
| // d.dispose()? | |
| }_ | |
| ) |
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