[Room] Dynamic name generation

lib/src/Room.dart

@@ -43,6 +43,9 @@ class Room {
   /// The name of the room if set by a participant.
   String name;
 
+  /// Whether this room has a name or the name is generated by member names.
+  bool hasName = false;
+
   /// The topic of the room if set by a participant.
   String topic;
 
@@ -104,6 +107,7 @@ class Room {
     this.id,
     this.membership,
     this.name,
+    this.hasName,
     this.topic,
     this.avatar,
     this.notificationCount,
@@ -375,11 +379,14 @@ class Room {
   /// Returns a Room from a json String which comes normally from the store.
   static Future<Room> getRoomFromTableRow(
       Map<String, dynamic> row, Client matrix) async {
+    bool newHasName = false;
     String name = row["topic"];
     if (name == "" && !row["canonical_alias"].isEmpty)
       name = row["canonical_alias"];
     else if (name == "")
       name = await matrix.store?.getChatNameFromMemberNames(row["id"]) ?? "";
+    else
+      newHasName = true;
 
     String avatarUrl = row["avatar_url"];
     if (avatarUrl == "")
@@ -388,6 +395,7 @@ class Room {
     return Room(
       id: row["id"],
       name: name,
+      hasName: newHasName,
       membership: Membership.values
           .firstWhere((e) => e.toString() == 'Membership.' + row["membership"]),
       topic: row["description"],

lib/src/RoomList.dart

@@ -124,19 +124,7 @@ class RoomList {
       if (rooms[j].id == eventUpdate.roomID) break;
     }
     final bool found = (j < rooms.length && rooms[j].id == eventUpdate.roomID);
-    if (!found) {
-      rooms.insert(
-          0,
-          Room(
-              id: eventUpdate.roomID,
-              membership: Membership.join,
-              name: "",
-              prev_batch: "",
-              highlightCount: 0,
-              notificationCount: 0));
-      if (onInsert != null) onInsert(0);
-      j = 0;
-    }
+    if (!found) return;
 
     // Is this an old timeline event? Then stop here...
     /*if (eventUpdate.type == "timeline" &&
@@ -162,6 +150,8 @@ class RoomList {
       // Update the room avatar
       rooms[j].avatar = MxContent(eventUpdate.content["content"]["url"]);
     }
+    if (eventUpdate.eventType == "m.room.member" && !rooms[j].hasName)
+      updateMemberName(j);
     sortAndUpdate();
   }
 
@@ -170,6 +160,11 @@ class RoomList {
         b.timeCreated.toTimeStamp().compareTo(a.timeCreated.toTimeStamp()));
     if (onUpdate != null) onUpdate();
   }
+
+  void updateMemberName(int position) async {
+    rooms[position].name =
+        await client.store.getChatNameFromMemberNames(rooms[position].id);
+  }
 }
 
 typedef onRoomListUpdateCallback = void Function();