115 lines
3.1 KiB
Dart
115 lines
3.1 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:provider/provider.dart';
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import '../model/flood_station.dart';
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import '../services/overlay_service.dart';
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import '../widgets/flood_station_list_view.dart';
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import '../services/flood_station_provider.dart';
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import '../widgets/station_filter.dart';
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import 'flood_station_page.dart';
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class LandingPage extends StatefulWidget {
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const LandingPage({super.key});
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@override
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State<LandingPage> createState() => _LandingPageState();
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}
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// uses mixin OverlayService to show loading overlay
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class _LandingPageState extends State<LandingPage> with OverlayService {
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late FloodStationProvider _floodStationProvider;
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@override
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void dispose() {
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super.dispose();
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removeLoadingNotifier(); // Clean up overlay if needed
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}
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@override
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Widget build(BuildContext context) {
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_floodStationProvider = context.watch<FloodStationProvider>();
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return Column(
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children: [
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StationFilter(
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onChanged: (filterText) => _handleFilterChange(filterText),
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),
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_buildStationList(),
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],
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);
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}
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// if the list of all Stations is empty the method returns a button to load them
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// else returns a list of FloodStations
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Widget _buildStationList() {
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if (!_shouldShowList) {
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return Expanded(
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child: Center(
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child: ElevatedButton(
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onPressed: _handleLoadAllStations,
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child: const Text('Load all Stations'),
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),
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),
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);
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}
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return Expanded(
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child: FloodStationListView(
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stations: _floodStationProvider.filtered
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? _floodStationProvider.filteredStations
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: _floodStationProvider.allStations,
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onItemTapped: _navigateToStationDetail,
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),
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);
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}
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void _handleFilterChange(String filterText) {
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if (filterText.isEmpty) {
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_floodStationProvider.filtered = false;
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setState(() {});
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return;
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}
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showLoadingNotifier(
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context: context,
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message: 'Loading',
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onDismiss: () {
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_floodStationProvider.cancelFilterLoading();
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},
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);
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_floodStationProvider.loadFilteredStations(filterText);
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_floodStationProvider.filteredStationsFuture
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?.then((_) => removeLoadingNotifier());
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_floodStationProvider.filtered = true;
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}
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void _handleLoadAllStations() {
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showLoadingNotifier(
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context: context,
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message: 'Loading',
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onDismiss: () {
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_floodStationProvider.cancelFilterLoading();
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},
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);
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_floodStationProvider
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.loadAllStations()
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.whenComplete(() => removeLoadingNotifier());
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}
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void _navigateToStationDetail(FloodStation station) {
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_floodStationProvider.selectedStation = station;
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Navigator.of(context).pushNamed(FloodStationPage.routeName);
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}
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// returns boolean to decide whether the list of stations should be shown
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// if the list of stations is empty and is not filtered either, the function returns false
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bool get _shouldShowList {
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if (!_floodStationProvider.filtered &&
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_floodStationProvider.allStations.isNotEmpty) {
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return true;
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}
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return _floodStationProvider.filtered;
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}
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}
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