Get latest posts from server

lib/ui/screens/newest_posts.dart

@@ -1,3 +1,10 @@
+import 'package:comunic/helpers/posts_helper.dart';
+import 'package:comunic/helpers/users_helper.dart';
+import 'package:comunic/lists/posts_list.dart';
+import 'package:comunic/lists/users_list.dart';
+import 'package:comunic/ui/screens/conversation_screen.dart';
+import 'package:comunic/ui/tiles/post_tile.dart';
+import 'package:comunic/utils/intl_utils.dart';
 import 'package:comunic/utils/ui_utils.dart';
 import 'package:flutter/material.dart';
 
@@ -11,10 +18,59 @@ class NewestPostsScreen extends StatefulWidget {
 }
 
 class _NewestPostsScreenState extends State<NewestPostsScreen> {
+  // Helpers
+  final PostsHelper _postsHelper = PostsHelper();
+  final UsersHelper _usersHelper = UsersHelper();
+
+  // Class members
+  PostsList _list;
+  UsersList _users;
+  ErrorLevel _error = ErrorLevel.NONE;
+
+  set error(ErrorLevel err) => setState(() => _error = err);
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    _loadPostsList();
+  }
+
+  void _loadError() =>
+      error = _list == null ? ErrorLevel.MAJOR : ErrorLevel.MINOR;
+
+  Future<void> _loadPostsList() async {
+    final list = await _postsHelper.getLatest();
+
+    if (list == null) return _loadError();
+
+    final users = await _usersHelper.getList(list.usersID);
+
+    if (users == null) return _loadError();
+
+    setState(() {
+      _list = list;
+      _users = users;
+    });
+  }
+
+  Widget _buildErrorCard() {
+    return buildErrorCard(tr("Could not get the list of posts !"));
+  }
+
+  Widget _buildListView() {
+    return ListView.builder(
+      itemCount: _list.length,
+      itemBuilder: (c, i) => PostTile(
+            post: _list[i],
+            usersInfo: _users,
+          ),
+    );
+  }
 
   @override
   Widget build(BuildContext context) {
-    return buildCenteredProgressBar();
+    if (_error == ErrorLevel.MAJOR) return _buildErrorCard();
+    if (_list == null) return buildCenteredProgressBar();
+    return _buildListView();
   }
-
-}
+}

lib/ui/tiles/post_tile.dart

@@ -0,0 +1,27 @@
+import 'package:comunic/lists/users_list.dart';
+import 'package:comunic/models/post.dart';
+import 'package:flutter/material.dart';
+
+/// Single posts tile
+///
+/// @author Pierre HUBERT
+
+class PostTile extends StatelessWidget {
+  final Post post;
+  final UsersList usersInfo;
+
+  const PostTile({
+    Key key,
+    @required this.post,
+    @required this.usersInfo,
+  })  : assert(post != null),
+        assert(usersInfo != null),
+        super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return ListTile(
+      leading: Text("a post"),
+    );
+  }
+}