85 lines
2.1 KiB
Dart
85 lines
2.1 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:async/async.dart';
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import 'package:flutter_map/flutter_map.dart';
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import 'package:latlong2/latlong.dart';
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import '../model/flood_station.dart';
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import '../widgets/custom_marker.dart';
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import 'api.dart';
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class FloodStationProvider extends ChangeNotifier {
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FloodStation? selectedStation;
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bool filtered = false;
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List<FloodStation> _allStations = [];
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List<FloodStation> _filteredStations = [];
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List<FloodStation> get allStations => _allStations;
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List<FloodStation> get filteredStations => _filteredStations;
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List<Marker> get stationsAsMarkers {
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return allStations
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.map<Marker>(
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(e) => Marker(
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alignment: Alignment.center,
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point: LatLng(e.lat, e.long),
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child: CustomMarker(),
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),
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)
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.toList();
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}
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CancelableOperation? _filteredStationsFuture;
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CancelableOperation? get filteredStationsFuture => _filteredStationsFuture;
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Future loadAllStationsInBatches({silent = false}) {
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int offset = 0;
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return Future.doWhile(() async {
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final stations = await Api.fetchStationsByRange(500, offset);
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if (stations.isNotEmpty) {
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_allStations.addAll(stations);
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if (!silent) {
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notifyListeners();
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}
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offset += 500;
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return true;
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} else {
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return false;
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}
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});
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}
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Future loadAllStations({silent = false}) {
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return Api.fetchAllStations().then(
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(value) {
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_allStations = value;
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if (!silent) {
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notifyListeners();
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}
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},
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);
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}
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Future loadFilteredStations(String filter, {silent = false}) {
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if (_filteredStationsFuture != null) {
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_filteredStationsFuture!.cancel();
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}
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final future = Api.fetchFilteredStations(filter);
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_filteredStationsFuture = CancelableOperation.fromFuture(future).then(
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(value) {
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_filteredStations = value;
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if (!silent) {
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notifyListeners();
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}
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},
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);
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return future;
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}
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void cancelFilterLoading() {
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if (_filteredStationsFuture != null) {
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_filteredStationsFuture!.cancel();
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}
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}
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}
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