Display the list of members of a group

lib/helpers/groups_helper.dart

@@ -1,9 +1,11 @@
 import 'dart:typed_data';
 
+import 'package:comunic/lists/group_members_list.dart';
 import 'package:comunic/lists/groups_list.dart';
 import 'package:comunic/models/advanced_group_info.dart';
 import 'package:comunic/models/api_request.dart';
 import 'package:comunic/models/group.dart';
+import 'package:comunic/models/group_membership.dart';
 import 'package:comunic/utils/api_utils.dart';
 import 'package:comunic/utils/map_utils.dart';
 
@@ -254,6 +256,18 @@ class GroupsHelper {
           .addString("password", password)
           .execWithThrow();
 
+  /// Get the list of members of the group
+  ///
+  /// Throws in case of failure
+  static Future<GroupMembersList> getMembersList(int groupID) async =>
+      GroupMembersList()
+        ..addAll((await APIRequest(uri: "groups/get_members", needLogin: true)
+                .addInt("id", groupID)
+                .execWithThrow())
+            .getArray()
+            .map((f) => _apiToGroupMembership(f))
+            .toList());
+
   /// Turn an API entry into a group object
   Group _getGroupFromAPI(Map<String, dynamic> map) {
     return Group(
@@ -290,4 +304,13 @@ class GroupsHelper {
         likes: map["number_likes"],
         userLike: map["is_liking"],
       );
+
+  /// Create [GroupMembership] object from API entry
+  static GroupMembership _apiToGroupMembership(Map<String, dynamic> row) =>
+      GroupMembership(
+        userID: row["user_id"],
+        groupID: row["group_id"],
+        timeCreate: row["time_create"],
+        level: _APIGroupsMembershipLevelsMap[row["level"]],
+      );
 }

lib/lists/group_members_list.dart

@@ -0,0 +1,11 @@
+import 'package:comunic/lists/abstract_list.dart';
+import 'package:comunic/models/group_membership.dart';
+
+/// Group members list
+///
+/// @author Pierre Hubert
+
+class GroupMembersList extends AbstractList<GroupMembership> {
+  /// Get the list of users in this set
+  Set<int> get usersID => map((f) => f.userID).toSet();
+}

lib/models/group_membership.dart

@@ -0,0 +1,23 @@
+import 'package:comunic/models/group.dart';
+import 'package:flutter/material.dart';
+
+/// Group membership information
+///
+/// @author Pierre Hubert
+
+class GroupMembership {
+  final int userID;
+  final int groupID;
+  final int timeCreate;
+  final GroupMembershipLevel level;
+
+  const GroupMembership({
+    @required this.userID,
+    @required this.groupID,
+    @required this.timeCreate,
+    @required this.level,
+  })  : assert(userID != null),
+        assert(groupID != null),
+        assert(timeCreate != null),
+        assert(level != null);
+}

lib/ui/screens/group_members_screen.dart

@@ -1,3 +1,10 @@
+import 'package:comunic/helpers/groups_helper.dart';
+import 'package:comunic/helpers/users_helper.dart';
+import 'package:comunic/lists/group_members_list.dart';
+import 'package:comunic/lists/users_list.dart';
+import 'package:comunic/models/group_membership.dart';
+import 'package:comunic/ui/widgets/account_image_widget.dart';
+import 'package:comunic/ui/widgets/async_screen_widget.dart';
 import 'package:comunic/ui/widgets/comunic_back_button_widget.dart';
 import 'package:comunic/utils/intl_utils.dart';
 import 'package:flutter/material.dart';
@@ -18,6 +25,17 @@ class GroupMembersScreen extends StatefulWidget {
 }
 
 class _GroupMembersScreenState extends State<GroupMembersScreen> {
+  GroupMembersList _members;
+  UsersList _users;
+
+  Future<void> _refresh() async {
+    final members = await GroupsHelper.getMembersList(widget.groupID);
+    final users = await UsersHelper().getListWithThrow(members.usersID);
+
+    _members = members;
+    _users = users;
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -25,6 +43,30 @@ class _GroupMembersScreenState extends State<GroupMembersScreen> {
         leading: ComunicBackButton(),
         title: Text(tr("Group members")),
       ),
+      body: _buildBody(),
+    );
+  }
+
+  Widget _buildBody() => AsyncScreenWidget(
+        onReload: _refresh,
+        onBuild: _buildBodyContent,
+        errorMessage: tr("Could not load the list of members of this group!"),
+      );
+
+  Widget _buildBodyContent() {
+    return ListView(
+      children: _members.map(_buildGroupMemberTile).toList(),
+    );
+  }
+
+  ListTile _buildGroupMemberTile(GroupMembership membership) {
+    final user = _users.getUser(membership.userID);
+
+    return ListTile(
+      leading: AccountImageWidget(
+        user: user,
+      ),
+      title: Text(user.displayName),
     );
   }
 }