feat: extract provider, add android news screen

lib/widgets/event_item.dart

@@ -68,6 +68,10 @@ class EventItem extends StatelessWidget {
       case 'ForkEvent':
         return TextSpan(children: [
           TextSpan(text: ' forked '),
+          createRepoLinkSpan(context, event.payload['forkee']['owner']['login'],
+              event.payload['forkee']['name']),
+          TextSpan(text: ' from '),
+          _buildRepo(context),
         ]);
       default:
         return TextSpan(
@@ -116,7 +120,7 @@ class EventItem extends StatelessWidget {
   TextSpan _buildRepo(BuildContext context) {
     String name = event.repo.name;
     var arr = name.split('/');
-    return _buildLink(context, name, () => RepoScreen(arr[0], arr[1]));
+    return createRepoLinkSpan(context, arr[0], arr[1]);
   }
 
   TextSpan _buildIssue(BuildContext context) {

lib/widgets/news_provider.dart

@@ -0,0 +1,66 @@
+import 'package:flutter/cupertino.dart';
+import 'package:git_flux/utils/utils.dart';
+
+typedef Future<void> Refresh();
+typedef Widget BuildWithContent(
+    {List<Event> events, ScrollController controller, Refresh refresh});
+
+class NewsProvider extends StatefulWidget {
+  final BuildWithContent build;
+
+  NewsProvider(this.build);
+
+  @override
+  NewsProviderState createState() => NewsProviderState();
+}
+
+class NewsProviderState extends State<NewsProvider> {
+  int page = 1;
+  bool loading = false;
+  List<Event> _events = [];
+  ScrollController _controller = ScrollController();
+
+  @override
+  void initState() {
+    super.initState();
+    _refresh();
+    _controller.addListener(() {
+      if (_controller.offset + 100 > _controller.position.maxScrollExtent &&
+          !_controller.position.outOfRange &&
+          !loading) {
+        _loadMore();
+      }
+    });
+  }
+
+  Future<void> _refresh() async {
+    setState(() {
+      loading = true;
+    });
+    page = 1;
+    var items = await fetchEvents(page);
+    setState(() {
+      loading = false;
+      _events = items;
+    });
+  }
+
+  _loadMore() async {
+    print('more');
+    setState(() {
+      loading = true;
+    });
+    page = page + 1;
+    var items = await fetchEvents(page);
+    setState(() {
+      loading = false;
+      _events.addAll(items);
+    });
+  }
+
+  @override
+  Widget build(context) {
+    return widget.build(
+        events: _events, controller: _controller, refresh: _refresh);
+  }
+}

lib/widgets/widgets.dart

@@ -1,5 +1,4 @@
 export 'avatar.dart';
-export 'event_item.dart';
 export 'user_name.dart';
 export 'timeline_item.dart';
 export 'comment_item.dart';