Automatically refresh the list of memberships

lib/ui/widgets/safe_state.dart

@@ -9,6 +9,7 @@ import 'package:flutter/material.dart';
 
 abstract class SafeState<T extends StatefulWidget> extends State<T> {
   final _subscriptions = List<StreamSubscription>();
+  final _timers = List<Timer>();
 
   bool _unmounted = false;
 
@@ -19,6 +20,9 @@ abstract class SafeState<T extends StatefulWidget> extends State<T> {
     // Close subscriptions
     _subscriptions.forEach((f) => f.cancel());
 
+    // Stop intervals
+    _timers.forEach((f) => f.cancel());
+
     super.dispose();
   }
 
@@ -52,4 +56,10 @@ abstract class SafeState<T extends StatefulWidget> extends State<T> {
       if (!_unmounted) cb();
     });
   }
+
+  /// Safely mimic the setInterval javascript function
+  void setInterval(int secs, void Function(Timer) cb) {
+    final timer = Timer.periodic(Duration(seconds: secs), cb);
+    _timers.add(timer);
+  }
 }

lib/ui/widgets/tablet_mode/memberships_panel.dart

@@ -28,7 +28,6 @@ class MembershipsPanel extends StatefulWidget {
 
 const _MembershipIconsWidth = 30.0;
 
-/// TODO : add auto-refresh
 class _MembershipsPanelState extends SafeState<MembershipsPanel> {
   final _refreshKey = GlobalKey<RefreshIndicatorState>();
   MembershipList _membershipList;
@@ -48,13 +47,13 @@ class _MembershipsPanelState extends SafeState<MembershipsPanel> {
       });
     } catch (e, s) {
       print("Could not load the list of memberships! $e\n$s");
-      setTimeout(5, _refresh);
     }
   }
 
   @override
   void initState() {
     super.initState();
+    setInterval(20, (t) => _refresh());
     _refresh();
   }