Show joined rooms, delete left rooms

To make the models update correctly in QML:
- ListModel and _QtModel merged
- Return a ListModelMap QObject from properties instead of
  a DefaultDict → QVariantMap

harmonyqml/backend/signal_manager.py

@@ -5,29 +5,54 @@ from PyQt5.QtCore import QObject
 
 from .backend import Backend
 from .client import Client
-from .model.items import User
+from .model.items import User, Room
 
 
 class SignalManager(QObject):
     def __init__(self, backend: Backend) -> None:
         super().__init__()
         self.backend = backend
-        self.connectAll()
 
-
-    def connectAll(self) -> None:
-        be = self.backend
-        be.clientManager.clientAdded.connect(self.onClientAdded)
-        be.clientManager.clientDeleted.connect(self.onClientDeleted)
+        cm = self.backend.clientManager
+        cm.clientAdded.connect(self.onClientAdded)
+        cm.clientDeleted.connect(self.onClientDeleted)
 
 
     def onClientAdded(self, client: Client) -> None:
+        self.connectClient(client)
         self.backend.models.accounts.append(User(
-            user_id      = client.nio.user_id,
-            display_name = client.nio.user_id.lstrip("@").split(":")[0],
+            user_id      = client.userID,
+            display_name = client.userID.lstrip("@").split(":")[0],
         ))
 
 
     def onClientDeleted(self, user_id: str) -> None:
         accs = self.backend.models.accounts
         del accs[accs.indexWhere("user_id", user_id)]
+
+
+    def connectClient(self, client: Client) -> None:
+        for sig_name in ("roomInvited", "roomJoined", "roomLeft"):
+            sig    = getattr(client, sig_name)
+            on_sig = getattr(self, f"on{sig_name[0].upper()}{sig_name[1:]}")
+            sig.connect(lambda room_id, o=on_sig, c=client: o(c, room_id))
+
+
+    def onRoomInvited(self, client: Client, room_id: str) -> None:
+        pass  # TODO
+
+
+    def onRoomJoined(self, client: Client, room_id: str) -> None:
+        room = client.nio.rooms[room_id]
+        name = room.name or room.canonical_alias or room.group_name()
+
+        self.backend.models.rooms[client.userID].append(Room(
+            room_id      = room_id,
+            display_name = name,
+            description  = getattr(room, "topic", ""),  # FIXME: outside init
+        ))
+
+
+    def onRoomLeft(self, client: Client, room_id: str) -> None:
+        rooms = self.backend.models.rooms[client.userID]
+        del rooms[rooms.indexWhere("room_id", room_id)]