lib/control/scanner_controller_impl.dart


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import 'dart:async';
import 'package:uvok_epaper_badge/control/scanner_controller.dart';
import 'package:meta/meta.dart';
import 'package:uvok_epaper_badge/model/device/device.dart';

/// Helper class which provides the setStatus method.
abstract class ScannerControllerImpl extends ScannerController {
  final StreamController<ScanStatus> _scanStatusController =
      StreamController<ScanStatus>.broadcast();
  final StreamController<List<Device>> _deviceContoller =
      StreamController<List<Device>>.broadcast();
  final StreamController<ScanAvailability> _availabilityStreamController =
      StreamController<ScanAvailability>.broadcast();

  ScanAvailability? _latestAvailability;

  @override
  Stream<ScanStatus> get statusStream => _scanStatusController.stream;

  @override
  Stream<List<Device>> get scanResultsStream => _deviceContoller.stream;

  @override
  Stream<ScanAvailability> get availabilityStream =>
      _availabilityStreamController.stream;

  ScannerControllerImpl() {
    // fucking broadcast streams not even caching one value...
    _availabilityStreamController.onListen = () {
      if (_latestAvailability != null) {
        _availabilityStreamController.add(_latestAvailability!);
      }
    };
  }

  @protected
  void setStatus(ScanStatus newStatus) {
    if (_scanStatusController.isClosed) return;

    _scanStatusController.add(newStatus);
  }

  @protected
  void setDevices(List<Device> devices) {
    if (_deviceContoller.isClosed) return;

    _deviceContoller.add(devices);
  }

  @protected
  void setAvailability(ScanAvailability available) {
    _availabilityStreamController.add(available);
    _latestAvailability = available;
  }

  @override
  void dispose() {
    _scanStatusController.close();
    _deviceContoller.close();
    _availabilityStreamController.close();
  }
}