diff --git a/harmonyqml/backend/client.py b/harmonyqml/backend/client.py
index a85ce5d9..b9dbc936 100644
--- a/harmonyqml/backend/client.py
+++ b/harmonyqml/backend/client.py
@@ -6,7 +6,7 @@ from concurrent.futures import Future, ThreadPoolExecutor
 from threading import Event
 from typing import Callable, DefaultDict, Dict
 
-from PyQt5.QtCore import QObject, pyqtSlot
+from PyQt5.QtCore import QObject, pyqtProperty, pyqtSignal, pyqtSlot
 
 import nio
 import nio.responses as nr
@@ -27,6 +27,11 @@ def futurize(func: Callable) -> Callable:
 
 
 class Client(QObject):
+    roomInvited = pyqtSignal(str)
+    roomJoined  = pyqtSignal(str)
+    roomLeft    = pyqtSignal(str)
+
+
     def __init__(self, hostname: str, username: str, device_id: str = ""
                 ) -> None:
         super().__init__()
@@ -48,7 +53,12 @@ class Client(QObject):
 
     def __repr__(self) -> str:
         return "%s(host=%r, port=%r, user_id=%r)" % \
-            (type(self).__name__, self.host, self.port, self.nio.user_id)
+            (type(self).__name__, self.host, self.port, self.userID)
+
+
+    @pyqtProperty(str, constant=True)
+    def userID(self) -> str:
+        return self.nio.user_id
 
 
     @pyqtSlot(str)
@@ -81,13 +91,24 @@ class Client(QObject):
     @futurize
     def startSyncing(self) -> None:
         while True:
-            self.net.talk(self.nio.sync, timeout=10)
+            self._on_sync(self.net.talk(self.nio.sync, timeout=10))
 
             if self._stop_sync.is_set():
                 self._stop_sync.clear()
                 break
 
 
+    def _on_sync(self, response: nr.SyncResponse) -> None:
+        for room_id in response.rooms.invite:
+            self.roomInvited.emit(room_id)
+
+        for room_id in response.rooms.join:
+            self.roomJoined.emit(room_id)
+
+        for room_id in response.rooms.left:
+            self.roomLeft.emit(room_id)
+
+
     @pyqtSlot(str, str, result="QVariantMap")
     def getUser(self, room_id: str, user_id: str) -> Dict[str, str]:
         try:
diff --git a/harmonyqml/backend/client_manager.py b/harmonyqml/backend/client_manager.py
index a5f8fc26..a6a546b5 100644
--- a/harmonyqml/backend/client_manager.py
+++ b/harmonyqml/backend/client_manager.py
@@ -61,7 +61,7 @@ class ClientManager(QObject):
 
 
     def _on_connected(self, client: Client) -> None:
-        self.clients[client.nio.user_id] = client
+        self.clients[client.userID] = client
         self.clientAdded.emit(client)
 
 
@@ -127,7 +127,7 @@ class ClientManager(QObject):
     def configAdd(self, client: Client) -> None:
         self._write_config({
             **self.configAccounts(),
-            **{client.nio.user_id: {
+            **{client.userID: {
                 "hostname": client.nio.host,
                 "token": client.nio.access_token,
                 "device_id": client.nio.device_id,
diff --git a/harmonyqml/backend/model/__init__.py b/harmonyqml/backend/model/__init__.py
index 93ad0d1e..5ed4936a 100644
--- a/harmonyqml/backend/model/__init__.py
+++ b/harmonyqml/backend/model/__init__.py
@@ -1,6 +1,7 @@
 # Copyright 2019 miruka
 # This file is part of harmonyqml, licensed under GPLv3.
 
-from .list_model import ListModel, _QtListModel
+from .list_model import ListModel
+from .list_model_map import ListModelMap
 from .qml_models import QMLModels
 from . import enums, items
diff --git a/harmonyqml/backend/model/list_model.py b/harmonyqml/backend/model/list_model.py
index 48f7d404..f967a303 100644
--- a/harmonyqml/backend/model/list_model.py
+++ b/harmonyqml/backend/model/list_model.py
@@ -1,6 +1,7 @@
 import logging
-from collections.abc import MutableSequence
-from typing import Any, Dict, List, Mapping, Optional, Sequence, Tuple, Union
+from typing import (
+    Any, Dict, Iterable, List, Mapping, Optional, Sequence, Tuple, Union
+)
 
 from namedlist import namedlist
 from PyQt5.QtCore import (
@@ -10,13 +11,39 @@ from PyQt5.QtCore import (
 NewValue = Union[Mapping[str, Any], Sequence]
 
 
-class _QtListModel(QAbstractListModel):
-    def __init__(self) -> None:
+class ListModel(QAbstractListModel):
+    def __init__(self, initial_data: Optional[List[NewValue]] = None) -> None:
         super().__init__()
         self._ref_namedlist          = None
         self._roles: Tuple[str, ...] = ()
         self._list:  list            = []
 
+        self._update_count: int = 0
+
+        if initial_data:
+            self.extend(initial_data)
+
+
+    def __repr__(self) -> str:
+        return "%s[%s]" % (type(self).__name__,
+                           ", ".join((repr(i) for i in self)))
+
+    def __getitem__(self, index):
+        return self._list[index]
+
+
+    def __setitem__(self, index, value) -> None:
+        self.set(index, value)
+
+
+    def __delitem__(self, index) -> None:
+        self.remove(index)
+
+
+    def __len__(self) -> int:
+        return self.rowCount()
+
+
     def roleNames(self) -> Dict[int, bytes]:
         return {Qt.UserRole + i: bytes(f, "utf-8")
                 for i, f in enumerate(self._roles, 1)}
@@ -60,6 +87,11 @@ class _QtListModel(QAbstractListModel):
         raise TypeError("Value must be a mapping or sequence.")
 
 
+    @pyqtProperty(int, constant=True)
+    def count(self) -> int:  # pylint: disable=arguments-differ
+        return self.rowCount()
+
+
     @pyqtSlot(int, result="QVariantMap")
     def get(self, index: int) -> Dict[str, Any]:
         return self._list[index]._asdict()
@@ -81,11 +113,7 @@ class _QtListModel(QAbstractListModel):
         self.beginInsertRows(QModelIndex(), index, index)
         self._list.insert(index, value)
         self.endInsertRows()
-
-
-    @pyqtProperty(int)
-    def count(self) -> int:
-        return self.rowCount()
+        self._update_count += 1
 
 
     @pyqtSlot(list)
@@ -93,19 +121,27 @@ class _QtListModel(QAbstractListModel):
         self.insert(self.rowCount(), value)
 
 
+    @pyqtSlot(list)
+    def extend(self, values: Iterable[NewValue]) -> None:
+        for val in values:
+            self.append(val)
+
+
     @pyqtSlot(int, list)
     def set(self, index: int, value: NewValue) -> None:
-        qidx              = self.index(index, 0)
+        qidx              = QAbstractListModel.index(index, 0)
         value             = self._convert_new_value(value)
         self._list[index] = value
         self.dataChanged.emit(qidx, qidx, self.roleNames())
+        self._update_count += 1
 
 
     @pyqtSlot(int, str, "QVariant")
     def setProperty(self, index: int, prop: str, value: Any) -> None:
         self._list[index][self._roles.index(prop)] = value
-        qidx = self.index(index, 0)
+        qidx = QAbstractListModel.index(index, 0)
         self.dataChanged.emit(qidx, qidx, self.roleNames())
+        self._update_count += 1
 
 
     # pylint: disable=invalid-name
@@ -135,13 +171,15 @@ class _QtListModel(QAbstractListModel):
         self._list[to:to] = cut
 
         self.endMoveRows()
+        self._update_count += 1
 
 
     @pyqtSlot(int)
-    def remove(self, index: int) -> None:
+    def remove(self, index: int) -> None:  # pylint: disable=arguments-differ
         self.beginRemoveRows(QModelIndex(), index, index)
         del self._list[index]
         self.endRemoveRows()
+        self._update_count += 1
 
 
     @pyqtSlot()
@@ -150,56 +188,9 @@ class _QtListModel(QAbstractListModel):
         self.beginRemoveRows(QModelIndex(), 0, self.rowCount())
         self._list.clear()
         self.endRemoveRows()
+        self._update_count += 1
 
 
-class ListModel(MutableSequence):
-    def __init__(self, initial_data: Optional[List[NewValue]] = None) -> None:
-        super().__init__()
-        self.qt_model = _QtListModel()
-
-        if initial_data:
-            self.extend(initial_data)
-
-
-    def __repr__(self) -> str:
-        return "%s[%s]" % (type(self).__name__,
-                           ", ".join((repr(i) for i in self)))
-
-    def __getitem__(self, index):
-        # pylint: disable=protected-access
-        return self.qt_model._list[index]
-
-
-    def __setitem__(self, index, value) -> None:
-        self.qt_model.set(index, value)
-
-
-    def __delitem__(self, index) -> None:
-        self.qt_model.remove(index)
-
-
-    def __len__(self) -> int:
-        return self.qt_model.rowCount()
-
-
-    def insert(self, index: int, value: NewValue) -> None:
-        self.qt_model.insert(index, value)
-
-
-    def indexWhere(self, prop: str, is_value: Any) -> int:
-        return self.qt_model.indexWhere(prop, is_value)
-
-
-    def setProperty(self, index: int, prop: str, value: Any) -> None:
-        "Set role of the item at *index* to *value*."
-        self.qt_model.setProperty(index, prop, value)
-
-
-    # pylint: disable=invalid-name
-    def move(self, from_: int, to: int, n: int = 1) -> None:
-        "Move *n* items *from_* index *to* another."
-        self.qt_model.move(from_, to, n)
-
-
-    def clear(self) -> None:
-        self.qt_model.clear()
+    @pyqtProperty(int, constant=True)
+    def reloadThis(self):
+        return self._update_count
diff --git a/harmonyqml/backend/model/list_model_map.py b/harmonyqml/backend/model/list_model_map.py
new file mode 100644
index 00000000..4528e3e4
--- /dev/null
+++ b/harmonyqml/backend/model/list_model_map.py
@@ -0,0 +1,36 @@
+from typing import Any, DefaultDict
+
+from PyQt5.QtCore import QObject, pyqtSlot
+
+from .list_model import ListModel
+
+
+class ListModelMap(QObject):
+    def __init__(self) -> None:
+        super().__init__()
+        self.dict: DefaultDict[Any, ListModel] = DefaultDict(ListModel)
+
+
+    @pyqtSlot(str, result="QVariant")
+    def get(self, key) -> ListModel:
+        return self.dict[key]
+
+
+    def __getitem__(self, key) -> ListModel:
+        return self.dict[key]
+
+
+    def __setitem__(self, key, value: ListModel) -> None:
+        self.dict[key] = value
+
+
+    def __detitem__(self, key) -> None:
+        del self.dict[key]
+
+
+    def __iter__(self):
+        return iter(self.dict)
+
+
+    def __len__(self) -> int:
+        return len(self.dict)
diff --git a/harmonyqml/backend/model/qml_models.py b/harmonyqml/backend/model/qml_models.py
index 26be7052..7e4f927b 100644
--- a/harmonyqml/backend/model/qml_models.py
+++ b/harmonyqml/backend/model/qml_models.py
@@ -1,31 +1,33 @@
 # Copyright 2019 miruka
 # This file is part of harmonyqml, licensed under GPLv3.
 
-from typing import DefaultDict, Dict
+from PyQt5.QtCore import QObject, pyqtProperty, pyqtSignal
 
-from PyQt5.QtCore import QObject, pyqtProperty
-
-from .list_model import ListModel, _QtListModel
+from .list_model import ListModel
+from .list_model_map import ListModelMap
 
 
 class QMLModels(QObject):
+    roomsChanged = pyqtSignal()
+
+
     def __init__(self) -> None:
         super().__init__()
-        self._accounts: ListModel                   = ListModel()
-        self._rooms:    DefaultDict[str, ListModel] = DefaultDict(ListModel)
-        self._messages: DefaultDict[str, ListModel] = DefaultDict(ListModel)
+        self._accounts: ListModel    = ListModel()
+        self._rooms:    ListModelMap = ListModelMap()
+        self._messages: ListModelMap = ListModelMap()
 
 
-    @pyqtProperty(_QtListModel, constant=True)
-    def accounts(self) -> _QtListModel:
-        return self._accounts.qt_model
+    @pyqtProperty(ListModel, constant=True)
+    def accounts(self):
+        return self._accounts
 
 
-    @pyqtProperty("QVariantMap", constant=True)
-    def rooms(self) -> Dict[str, _QtListModel]:
-        return {user_id: l.qt_model for user_id, l in self._rooms.items()}
+    @pyqtProperty("QVariant", notify=roomsChanged)
+    def rooms(self):
+        return self._rooms
 
 
-    @pyqtProperty("QVariantMap", constant=True)
-    def messages(self) -> Dict[str, _QtListModel]:
-        return {room_id: l.qt_model for room_id, l in self._messages.items()}
+    @pyqtProperty("QVariant", constant=True)
+    def messages(self):
+        return self._messages
diff --git a/harmonyqml/backend/signal_manager.py b/harmonyqml/backend/signal_manager.py
index 03f833f9..8b8791e5 100644
--- a/harmonyqml/backend/signal_manager.py
+++ b/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)]
diff --git a/harmonyqml/components/chat/MessageList.qml b/harmonyqml/components/chat/MessageList.qml
index 402ed40f..3c33812c 100644
--- a/harmonyqml/components/chat/MessageList.qml
+++ b/harmonyqml/components/chat/MessageList.qml
@@ -13,7 +13,7 @@ Rectangle {
     ListView {
         id: messageListView
         anchors.fill: parent
-        model: Backend.models.messages[chatPage.room.room_id]
+        model: Backend.models.messages.get(chatPage.room.room_id)
         delegate: MessageDelegate {}
         //highlight: Rectangle {color: "lightsteelblue"; radius: 5}
 
diff --git a/harmonyqml/components/side_pane/AccountDelegate.qml b/harmonyqml/components/side_pane/AccountDelegate.qml
index 00d142a2..1d90baf0 100644
--- a/harmonyqml/components/side_pane/AccountDelegate.qml
+++ b/harmonyqml/components/side_pane/AccountDelegate.qml
@@ -71,7 +71,7 @@ ColumnLayout {
 
         Layout.minimumHeight:
             roomList.visible ?
-            roomList.contentHeight + roomList.anchors.margins * 2 :
+            800 :
             0
         Layout.maximumHeight: Layout.minimumHeight
 
diff --git a/harmonyqml/components/side_pane/AccountList.qml b/harmonyqml/components/side_pane/AccountList.qml
index e9f455c5..a589ea05 100644
--- a/harmonyqml/components/side_pane/AccountList.qml
+++ b/harmonyqml/components/side_pane/AccountList.qml
@@ -5,7 +5,7 @@ import QtQuick.Layouts 1.4
 ListView {
     id: "accountList"
     spacing: 8
-    model: Backend.models.accounts
+    model:  Backend.models.accounts
     delegate: AccountDelegate {}
     clip: true
 }
diff --git a/harmonyqml/components/side_pane/RoomDelegate.qml b/harmonyqml/components/side_pane/RoomDelegate.qml
index 5cd072da..d9b497f7 100644
--- a/harmonyqml/components/side_pane/RoomDelegate.qml
+++ b/harmonyqml/components/side_pane/RoomDelegate.qml
@@ -38,8 +38,8 @@ MouseArea {
             }
             Base.HLabel {
                 function get_text() {
-                    var msgs = Backend.models.messages[room_id]
-                    if (msgs.count < 1) { return "" }
+                    var msgs = Backend.models.messages.get(room_id)
+                    if (! msgs || msgs.count < 1) { return "" }
 
                     var msg = msgs.get(-1)
                     var color_ = (msg.sender_id === roomList.user_id ?
@@ -54,7 +54,7 @@ MouseArea {
 
                 id: subtitleLabel
                 visible: text !== ""
-                text: Backend.models.messages[room_id].reloadThis, get_text()
+                text: Backend.models.messages.get(room_id).reloadThis, get_text()
                 textFormat: Text.StyledText
 
                 font.pixelSize: smallSize
diff --git a/harmonyqml/components/side_pane/RoomList.qml b/harmonyqml/components/side_pane/RoomList.qml
index e42842b9..3b3c733e 100644
--- a/harmonyqml/components/side_pane/RoomList.qml
+++ b/harmonyqml/components/side_pane/RoomList.qml
@@ -21,6 +21,6 @@ ListView {
 
     id: "roomList"
     spacing: 8
-    model: Backend.models.rooms[for_user_id]
+    model: Backend.models.rooms.get(for_user_id)
     delegate: RoomDelegate {}
 }