rsflutterapp

Bahnhofsfoto-App for Android and iOS using Flutter
git clone git://archive.git.mtrnord.blog/MTRNord/rsflutterapp.git
Log | Files | Refs | README

StationsTab.dart (3883B)

      1 import 'package:flutter/cupertino.dart';
      2 import 'package:flutter/material.dart';
      3 import 'package:rs_flutter_app/components/SearchBar.dart';
      4 
      5 import '../../models/models.dart';
      6 import '../../repos/repositories.dart';
      7 import '../DetailsPage.dart';
      8 
      9 class StationsTab extends StatefulWidget {
     10   final RailwayStationsRepository railwayStationsRepository;
     11 
     12   StationsTab({@required this.railwayStationsRepository})
     13       : assert(railwayStationsRepository != null);
     14 
     15   @override
     16   StationsTabState createState() => StationsTabState();
     17 }
     18 
     19 class StationsTabState extends State<StationsTab>
     20     with AutomaticKeepAliveClientMixin<StationsTab> {
     21   final filterTextController = TextEditingController();
     22   List<Station> stations;
     23   String filterText;
     24 
     25   List<Station> filter() {
     26     var stationsL = stations;
     27     if (filterText != null && filterText != "") {
     28       stationsL = stations
     29           .where(
     30             (station) => (filterText != null &&
     31                 filterText != "" &&
     32                 station.title
     33                     .toLowerCase()
     34                     .startsWith(filterText.toLowerCase())),
     35           )
     36           .toList(growable: false);
     37     }
     38     return stationsL;
     39   }
     40 
     41   void handleFilter() {
     42     setState(() {
     43       filterText = filterTextController.text;
     44     });
     45   }
     46 
     47   @override
     48   initState() {
     49     super.initState();
     50     filterTextController.addListener(handleFilter);
     51   }
     52 
     53   @override
     54   void dispose() {
     55     filterTextController.removeListener(handleFilter);
     56     super.dispose();
     57   }
     58 
     59   Future<List<Station>> getStations() async {
     60     if (stations == null) {
     61       List<Station> stationsL =
     62           await widget.railwayStationsRepository.getStations();
     63       stationsL.sort(
     64         (a, b) => (a.title).compareTo(b.title),
     65       );
     66       stations = stationsL;
     67     }
     68     return stations;
     69   }
     70 
     71   @override
     72   Widget build(BuildContext context) {
     73     super.build(context);
     74 
     75     return Scaffold(
     76       appBar: AppBar(
     77         title: Text("Bahnhöfe"),
     78         bottom: PreferredSize(
     79           preferredSize: Size.fromHeight(56),
     80           child: Padding(
     81             padding: EdgeInsets.all(8),
     82             child: SearchBar(
     83               filterTextController: filterTextController,
     84             ),
     85           ),
     86         ),
     87       ),
     88       body: FutureBuilder<List<Station>>(
     89         future: getStations(),
     90         builder: (BuildContext context, AsyncSnapshot<List<Station>> snapshot) {
     91           if (snapshot.hasError) {
     92             // TODO handle error
     93             debugPrint(snapshot.error.toString());
     94           }
     95           if (!snapshot.hasData) {
     96             return Center(
     97               child: CircularProgressIndicator(),
     98             );
     99           }
    100           var filtered = filter();
    101 
    102           if (filtered == null || filtered.isEmpty) {
    103             return Container();
    104           }
    105 
    106           if (stations.isEmpty) {
    107             return Container();
    108           }
    109 
    110           return ListView.separated(
    111             itemCount: filtered.length,
    112             separatorBuilder: (BuildContext context, int index) {
    113               return Divider();
    114             },
    115             itemBuilder: (BuildContext context, int index) {
    116               return ListTile(
    117                 trailing:
    118                     filtered[index].photoUrl != "" ? Icon(Icons.image) : null,
    119                 title: Text(filtered[index].title),
    120                 onTap: () {
    121                   Navigator.of(context).push(
    122                     MaterialPageRoute(
    123                       builder: (BuildContext context) => DetailsPage(
    124                         station: filtered[index],
    125                         railwayStationsRepository:
    126                             widget.railwayStationsRepository,
    127                       ),
    128                     ),
    129                   );
    130                 },
    131               );
    132             },
    133           );
    134         },
    135       ),
    136     );
    137   }
    138 
    139   @override
    140   bool get wantKeepAlive => true;
    141 }