rsflutterapp

commit d691d8f73f27ee8d8d20fe46c65f911a09512869
parent 31c13956455a68e1df6f8fadba3b4c40bf891ec9
Author: Marcel <mtrnord1@gmail.com>
Date:   Sun, 23 Feb 2020 20:35:32 +0100

Prevent reloading on each tab switch

Took 10 minutes

Diffstat:
M
lib/views/HomePage.dart
 | 
2
+-
M
lib/views/tabs/RankingsTab.dart
 | 
23
++++++++++++++++++++---
M
lib/views/tabs/StationsTab.dart
 | 
24
++++++++++++++++++++----

3 files changed, 41 insertions(+), 8 deletions(-)
diff --git a/lib/views/HomePage.dart b/lib/views/HomePage.dart
@@ -23,7 +23,7 @@ class HomePage extends StatelessWidget {
 
     return DefaultTabController(
       length: 4,
-      initialIndex: 3,
+      initialIndex: 2,
       child: Scaffold(
         bottomNavigationBar: Container(
           color: Theme.of(context).primaryColor,
diff --git a/lib/views/tabs/RankingsTab.dart b/lib/views/tabs/RankingsTab.dart
@@ -1,20 +1,34 @@
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_svg/flutter_svg.dart';
+
 import '../../repos/repositories.dart';
 
-class RankingsTab extends StatelessWidget {
+class RankingsTab extends StatefulWidget {
   final RailwayStationsRepository railwayStationsRepository;
 
   RankingsTab({@required this.railwayStationsRepository})
       : assert(railwayStationsRepository != null);
 
-  Future<List<List<String>>> getScores() {
-    return this.railwayStationsRepository.getScores();
+  @override
+  RankingsTabState createState() => RankingsTabState();
+}
+
+class RankingsTabState extends State<RankingsTab>
+    with AutomaticKeepAliveClientMixin<RankingsTab> {
+  List<List<String>> scores;
+
+  Future<List<List<String>>> getScores() async {
+    if (scores == null) {
+      scores = await widget.railwayStationsRepository.getScores();
+    }
+    return scores;
   }
 
   @override
   Widget build(BuildContext context) {
+    super.build(context);
+
     return FutureBuilder(
       future: getScores(),
       builder:
@@ -98,4 +112,7 @@ class RankingsTab extends StatelessWidget {
       },
     );
   }
+
+  @override
+  bool get wantKeepAlive => true;
 }
diff --git a/lib/views/tabs/StationsTab.dart b/lib/views/tabs/StationsTab.dart
@@ -5,18 +5,31 @@ import '../../models/models.dart';
 import '../../repos/repositories.dart';
 import '../DetailsPage.dart';
 
-class StationsTab extends StatelessWidget {
+class StationsTab extends StatefulWidget {
   final RailwayStationsRepository railwayStationsRepository;
 
   StationsTab({@required this.railwayStationsRepository})
       : assert(railwayStationsRepository != null);
 
-  Future<List<Station>> getStations() {
-    return this.railwayStationsRepository.getStations();
+  @override
+  StationsTabState createState() => StationsTabState();
+}
+
+class StationsTabState extends State<StationsTab>
+    with AutomaticKeepAliveClientMixin<StationsTab> {
+  List<Station> stations;
+
+  Future<List<Station>> getStations() async {
+    if (stations == null) {
+      stations = await widget.railwayStationsRepository.getStations();
+    }
+    return stations;
   }
 
   @override
   Widget build(BuildContext context) {
+    super.build(context);
+
     return FutureBuilder(
       future: getStations(),
       builder: (BuildContext context, AsyncSnapshot<List<Station>> snapshot) {
@@ -49,7 +62,7 @@ class StationsTab extends StatelessWidget {
                           builder: (BuildContext context) => DetailsPage(
                             station: stations[index],
                             railwayStationsRepository:
-                                railwayStationsRepository,
+                                widget.railwayStationsRepository,
                           ),
                         ),
                       );
@@ -68,4 +81,7 @@ class StationsTab extends StatelessWidget {
       },
     );
   }
+
+  @override
+  bool get wantKeepAlive => true;
 }