Can respond to friendship requests from memberships bar

lib/lists/memberships_list.dart

@@ -30,4 +30,8 @@ class MembershipList extends AbstractList<Membership> {
   Set<int> get groupsId => where((f) => f.type == MembershipType.GROUP)
       .map((f) => f.groupID)
       .toSet();
+
+  /// Remove a friend membership from the list
+  void removeFriend(int friendID) => remove(firstWhere(
+      (f) => f.type == MembershipType.FRIEND && f.friend.id == friendID));
 }

lib/models/friend.dart

@@ -8,12 +8,12 @@ import 'package:meta/meta.dart';
 /// @author Pierre HUBERT
 
 class Friend extends CacheModel implements Comparable<Friend> {
-  final bool accepted;
+  bool accepted;
   final int lastActive;
   final bool following;
   final bool canPostTexts;
 
-  const Friend({
+  Friend({
     @required int id,
     @required this.accepted,
     @required this.lastActive,
@@ -22,6 +22,8 @@ class Friend extends CacheModel implements Comparable<Friend> {
   })  : assert(id != null),
         assert(accepted != null),
         assert(lastActive != null),
+        assert(following != null),
+        assert(canPostTexts != null),
         super(id: id);
 
   /// Check out whether friend is connected or not

lib/ui/widgets/tablet_mode/memberships_panel.dart

@@ -1,10 +1,12 @@
 import 'package:comunic/helpers/conversations_helper.dart';
+import 'package:comunic/helpers/friends_helper.dart';
 import 'package:comunic/helpers/groups_helper.dart';
 import 'package:comunic/helpers/users_helper.dart';
 import 'package:comunic/helpers/webapp_helper.dart';
 import 'package:comunic/lists/groups_list.dart';
 import 'package:comunic/lists/memberships_list.dart';
 import 'package:comunic/lists/users_list.dart';
+import 'package:comunic/models/friend.dart';
 import 'package:comunic/models/membership.dart';
 import 'package:comunic/ui/widgets/account_image_widget.dart';
 import 'package:comunic/ui/widgets/group_icon_widget.dart';
@@ -92,13 +94,40 @@ class _MembershipsPanelState extends SafeState<MembershipsPanel> {
   Widget _buildFriendMembership(Membership membership) {
     final user = _usersList.getUser(membership.friend.id);
     final connected = membership.friend.isConnected;
+
+    Widget subtitle;
+
+    if (!membership.friend.accepted) {
+      subtitle = RichText(
+          text: TextSpan(children: [
+        WidgetSpan(
+            child: _RespondFriendshipRequestButton(
+          friend: membership.friend,
+          accept: true,
+          text: tr("Accept"),
+          color: Colors.green,
+          onTap: _respondFriendshipRequest,
+        )),
+        TextSpan(text: "   "),
+        WidgetSpan(
+            child: _RespondFriendshipRequestButton(
+          friend: membership.friend,
+          accept: false,
+          text: tr("Reject"),
+          color: Colors.red,
+          onTap: _respondFriendshipRequest,
+        )),
+      ]));
+    } else
+      subtitle = Text(
+        connected ? tr("Online") : diffTimeFromNowToStr(membership.lastActive),
+        style: TextStyle(color: connected ? Colors.green : null),
+      );
+
     return ListTile(
       leading: AccountImageWidget(user: user, width: _MembershipIconsWidth),
       title: Text(user.displayName),
-      subtitle: Text(
+      subtitle: subtitle,
-        connected ? tr("Online") : diffTimeFromNowToStr(membership.lastActive),
-        style: TextStyle(color: connected ? Colors.green : null),
-      ),
     );
   }
 
@@ -124,4 +153,55 @@ class _MembershipsPanelState extends SafeState<MembershipsPanel> {
       subtitle: Text(diffTimeFromNowToStr(membership.lastActive)),
     );
   }
+
+  /// Respond to a friendship request
+  Future<void> _respondFriendshipRequest(Friend f, bool accept) async {
+    try {
+      if (!accept &&
+          !await showConfirmDialog(
+              context: Scaffold.of(context)
+                  .context, // Without this the text appears in white
+              message:
+                  tr("Do you really want to reject this friendship request?")))
+        return;
+
+      await FriendsHelper().respondRequest(f.id, accept);
+
+      setState(() {
+        if (accept)
+          f.accepted = true;
+        else
+          _membershipList.removeFriend(f.id);
+      });
+      _refreshKey.currentState.show();
+    } catch (e, s) {
+      print("Could not respond to friendship request! $e\n$s");
+      showSimpleSnack(context, tr("Could not respond to friendship request!"));
+    }
+  }
+}
+
+class _RespondFriendshipRequestButton extends StatelessWidget {
+  final Friend friend;
+  final bool accept;
+  final String text;
+  final Color color;
+  final void Function(Friend, bool) onTap;
+
+  const _RespondFriendshipRequestButton({
+    Key key,
+    @required this.friend,
+    @required this.accept,
+    @required this.text,
+    @required this.color,
+    @required this.onTap,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return InkWell(
+      onTap: () => onTap(friend, accept),
+      child: Text(text, style: TextStyle(color: color)),
+    );
+  }
 }