fix tests

- Create RoomListStoreV3Event as to not conflict with loading event definition in Create RoomListStoreEvent.
- Add a loaded event
- Use it to determine loaded state in useFilteredRooms rather than the update event which gets fired in other cases.

res/css/_components.pcss

@@ -280,6 +280,7 @@
 @import "./views/rooms/RoomListPanel/_RoomListPrimaryFilters.pcss";
 @import "./views/rooms/RoomListPanel/_RoomListSearch.pcss";
 @import "./views/rooms/RoomListPanel/_RoomListSecondaryFilters.pcss";
+@import "./views/rooms/RoomListPanel/_RoomListSkeleton.pcss";
 @import "./views/rooms/_AppsDrawer.pcss";
 @import "./views/rooms/_Autocomplete.pcss";
 @import "./views/rooms/_AuxPanel.pcss";

res/css/views/rooms/RoomListPanel/_RoomListSkeleton.pcss

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+.mx_RoomListSkeleton {
+    position: relative;
+    margin-left: 4px;
+    height: 100%;
+
+    &::before {
+        background-color: var(--cpd-color-bg-subtle-secondary);
+        width: 100%;
+        height: 100%;
+
+        content: "";
+        position: absolute;
+        mask-repeat: repeat-y;
+        mask-size: auto 96px;
+        mask-image: url("$(res)/img/element-icons/roomlist/room-list-item-skeleton.svg");
+    }
+}

res/css/views/rooms/_RoomSublist.pcss

@@ -404,8 +404,7 @@ Please see LICENSE files in the repository root for full details.
     height: 240px;
 
     &::before {
-        background: $roomsublist-skeleton-ui-bg;
-
+        background-color: var(--cpd-color-bg-subtle-secondary);
         width: 100%;
         height: 100%;
 

src/components/viewmodels/roomlist/RoomListViewModel.tsx

@@ -22,6 +22,11 @@ import { useStickyRoomList } from "./useStickyRoomList";
 import { useRoomListNavigation } from "./useRoomListNavigation";
 
 export interface RoomListViewState {
+    /**
+     * Whether the list of rooms is being loaded.
+     */
+    isLoadingRooms: boolean;
+
     /**
      * A list of rooms to be displayed in the left panel.
      */
@@ -99,6 +104,7 @@ export interface RoomListViewState {
 export function useRoomListViewModel(): RoomListViewState {
     const matrixClient = useMatrixClientContext();
     const {
+        isLoadingRooms,
         primaryFilters,
         activePrimaryFilter,
         rooms: filteredRooms,
@@ -123,6 +129,7 @@ export function useRoomListViewModel(): RoomListViewState {
     const createRoom = useCallback(() => createRoomFunc(currentSpace), [currentSpace]);
 
     return {
+        isLoadingRooms,
         rooms,
         canCreateRoom,
         createRoom,

src/components/viewmodels/roomlist/useFilteredRooms.tsx

@@ -10,8 +10,7 @@ import { useCallback, useMemo, useState } from "react";
 import type { Room } from "matrix-js-sdk/src/matrix";
 import { FilterKey } from "../../../stores/room-list-v3/skip-list/filters";
 import { _t, _td, type TranslationKey } from "../../../languageHandler";
-import RoomListStoreV3 from "../../../stores/room-list-v3/RoomListStoreV3";
-import { LISTS_UPDATE_EVENT } from "../../../stores/room-list/RoomListStore";
+import RoomListStoreV3, { LISTS_LOADED_EVENT, LISTS_UPDATE_EVENT } from "../../../stores/room-list-v3/RoomListStoreV3";
 import { useEventEmitter } from "../../../hooks/useEventEmitter";
 import SpaceStore from "../../../stores/spaces/SpaceStore";
 import { UPDATE_SELECTED_SPACE } from "../../../stores/spaces";
@@ -35,6 +34,7 @@ export interface PrimaryFilter {
 
 interface FilteredRooms {
     primaryFilters: PrimaryFilter[];
+    isLoadingRooms: boolean;
     rooms: Room[];
     activateSecondaryFilter: (filter: SecondaryFilters) => void;
     activeSecondaryFilter: SecondaryFilters;
@@ -115,6 +115,7 @@ export function useFilteredRooms(): FilteredRooms {
     );
 
     const [rooms, setRooms] = useState(() => RoomListStoreV3.instance.getSortedRoomsInActiveSpace());
+    const [isLoadingRooms, setIsLoadingRooms] = useState(() => RoomListStoreV3.instance.isLoadingRooms);
 
     const updateRoomsFromStore = useCallback((filters: FilterKey[] = []): void => {
         const newRooms = RoomListStoreV3.instance.getSortedRoomsInActiveSpace(filters);
@@ -139,6 +140,10 @@ export function useFilteredRooms(): FilteredRooms {
         updateRoomsFromStore(filters);
     });
 
+    useEventEmitter(RoomListStoreV3.instance, LISTS_LOADED_EVENT, () => {
+        setIsLoadingRooms(false);
+    });
+
     /**
      * Secondary filters are activated using this function.
      * This is different to how primary filters work because the secondary
@@ -194,5 +199,12 @@ export function useFilteredRooms(): FilteredRooms {
 
     const activePrimaryFilter = useMemo(() => primaryFilters.find((filter) => filter.active), [primaryFilters]);
 
-    return { primaryFilters, activePrimaryFilter, rooms, activateSecondaryFilter, activeSecondaryFilter };
+    return {
+        isLoadingRooms,
+        primaryFilters,
+        activePrimaryFilter,
+        rooms,
+        activateSecondaryFilter,
+        activeSecondaryFilter,
+    };
 }

src/components/views/rooms/RoomListPanel/RoomListView.tsx

@@ -19,12 +19,19 @@ import { RoomListSecondaryFilters } from "./RoomListSecondaryFilters";
 export function RoomListView(): JSX.Element {
     const vm = useRoomListViewModel();
     const isRoomListEmpty = vm.rooms.length === 0;
-
+    let listBody;
+    if (vm.isLoadingRooms) {
+        listBody = <div className="mx_RoomListSkeleton" />;
+    } else if (isRoomListEmpty) {
+        listBody = <EmptyRoomList vm={vm} />;
+    } else {
+        listBody = <RoomList vm={vm} />;
+    }
     return (
         <>
             <RoomListPrimaryFilters vm={vm} />
             <RoomListSecondaryFilters vm={vm} />
-            {isRoomListEmpty ? <EmptyRoomList vm={vm} /> : <RoomList vm={vm} />}
+            {listBody}
         </>
     );
 }

src/stores/room-list-v3/RoomListStoreV3.ts

@@ -16,7 +16,6 @@ import { AsyncStoreWithClient } from "../AsyncStoreWithClient";
 import SettingsStore from "../../settings/SettingsStore";
 import { VisibilityProvider } from "../room-list/filters/VisibilityProvider";
 import defaultDispatcher from "../../dispatcher/dispatcher";
-import { LISTS_UPDATE_EVENT } from "../room-list/RoomListStore";
 import { RoomSkipList } from "./skip-list/RoomSkipList";
 import { RecencySorter } from "./skip-list/sorters/RecencySorter";
 import { AlphabeticSorter } from "./skip-list/sorters/AlphabeticSorter";
@@ -49,6 +48,15 @@ const FILTERS = [
     new LowPriorityFilter(),
 ];
 
+export enum RoomListStoreV3Event {
+    // The event/channel which is called when the room lists have been changed.
+    ListsUpdate = "lists_update",
+    // The event which is called when the room list is loaded.
+    ListsLoaded = "lists_loaded",
+}
+
+export const LISTS_UPDATE_EVENT = RoomListStoreV3Event.ListsUpdate;
+export const LISTS_LOADED_EVENT = RoomListStoreV3Event.ListsLoaded;
 /**
  * This store allows for fast retrieval of the room list in a sorted and filtered manner.
  * This is the third such implementation hence the "V3".
@@ -76,6 +84,13 @@ export class RoomListStoreV3Class extends AsyncStoreWithClient<EmptyObject> {
         return rooms;
     }
 
+    /**
+     * Check whether the initial list of rooms has loaded.
+     */
+    public get isLoadingRooms(): boolean {
+        return !this.roomSkipList?.initialized;
+    }
+
     /**
      * Get a list of sorted rooms.
      */
@@ -127,6 +142,7 @@ export class RoomListStoreV3Class extends AsyncStoreWithClient<EmptyObject> {
         await SpaceStore.instance.storeReadyPromise;
         const rooms = this.getRooms();
         this.roomSkipList.seed(rooms);
+        this.emit(LISTS_LOADED_EVENT);
         this.emit(LISTS_UPDATE_EVENT);
     }
 

test/unit-tests/components/viewmodels/roomlist/RoomListViewModel-test.tsx

@@ -9,9 +9,8 @@ import { range } from "lodash";
 import { act, renderHook, waitFor } from "jest-matrix-react";
 import { mocked } from "jest-mock";
 
-import RoomListStoreV3 from "../../../../../src/stores/room-list-v3/RoomListStoreV3";
+import RoomListStoreV3, { LISTS_UPDATE_EVENT } from "../../../../../src/stores/room-list-v3/RoomListStoreV3";
 import { mkStubRoom } from "../../../../test-utils";
-import { LISTS_UPDATE_EVENT } from "../../../../../src/stores/room-list/RoomListStore";
 import { useRoomListViewModel } from "../../../../../src/components/viewmodels/roomlist/RoomListViewModel";
 import { FilterKey } from "../../../../../src/stores/room-list-v3/skip-list/filters";
 import { SecondaryFilters } from "../../../../../src/components/viewmodels/roomlist/useFilteredRooms";

test/unit-tests/components/views/rooms/RoomListPanel/EmptyRoomList-test.tsx

@@ -20,6 +20,7 @@ describe("<EmptyRoomList />", () => {
 
     beforeEach(() => {
         vm = {
+            isLoadingRooms: false,
             rooms: [],
             primaryFilters: [],
             activateSecondaryFilter: jest.fn().mockReturnValue({}),

test/unit-tests/components/views/rooms/RoomListPanel/RoomList-test.tsx

@@ -29,6 +29,7 @@ describe("<RoomList />", () => {
         matrixClient = stubClient();
         const rooms = Array.from({ length: 10 }, (_, i) => mkRoom(matrixClient, `room${i}`));
         vm = {
+            isLoadingRooms: false,
             rooms,
             primaryFilters: [],
             activateSecondaryFilter: () => {},

test/unit-tests/components/views/rooms/RoomListPanel/RoomListFilterMenu-test.tsx

@@ -26,6 +26,7 @@ describe("<RoomListFilterMenu />", () => {
 
     beforeEach(() => {
         vm = {
+            isLoadingRooms: false,
             rooms: [],
             canCreateRoom: true,
             createRoom: jest.fn(),

test/unit-tests/components/views/rooms/RoomListPanel/RoomListPrimaryFilters-test.tsx

@@ -20,6 +20,7 @@ describe("<RoomListPrimaryFilters />", () => {
 
     beforeEach(() => {
         vm = {
+            isLoadingRooms: false,
             rooms: [],
             canCreateRoom: true,
             createRoom: jest.fn(),

test/unit-tests/components/views/rooms/RoomListPanel/RoomListSecondaryFilters-test.tsx

@@ -18,6 +18,7 @@ describe("<RoomListSecondaryFilters />", () => {
 
     beforeEach(() => {
         vm = {
+            isLoadingRooms: false,
             rooms: [],
             canCreateRoom: true,
             createRoom: jest.fn(),

test/unit-tests/components/views/rooms/RoomListPanel/RoomListView-test.tsx

@@ -24,6 +24,7 @@ jest.mock("../../../../../../src/components/viewmodels/roomlist/RoomListViewMode
 
 describe("<RoomListView />", () => {
     const defaultValue: RoomListViewState = {
+        isLoadingRooms: false,
         rooms: [],
         primaryFilters: [],
         activateSecondaryFilter: jest.fn().mockReturnValue({}),
@@ -43,6 +44,16 @@ describe("<RoomListView />", () => {
         jest.resetAllMocks();
     });
 
+    it("should render the loading room list", () => {
+        mocked(useRoomListViewModel).mockReturnValue({
+            ...defaultValue,
+            isLoadingRooms: true,
+        });
+
+        const roomList = render(<RoomListView />);
+        expect(roomList.container.querySelector(".mx_RoomListSkeleton")).not.toBeNull();
+    });
+
     it("should render an empty room list", () => {
         mocked(useRoomListViewModel).mockReturnValue(defaultValue);
 

test/unit-tests/components/views/rooms/RoomListPanel/__snapshots__/RoomListPanel-test.tsx.snap

@@ -183,47 +183,8 @@ exports[`<RoomListPanel /> should not render the RoomListSearch component when U
       </button>
     </div>
     <div
-      class="mx_Flex mx_EmptyRoomList_GenericPlaceholder"
-      data-testid="empty-room-list"
-      style="--mx-flex-display: flex; --mx-flex-direction: column; --mx-flex-align: stretch; --mx-flex-justify: center; --mx-flex-gap: var(--cpd-space-2x); --mx-flex-wrap: nowrap;"
-    >
-      <span
-        class="mx_EmptyRoomList_GenericPlaceholder_title"
-      >
-        No chats yet
-      </span>
-      <span
-        class="mx_EmptyRoomList_GenericPlaceholder_description"
-      >
-        Get started by messaging someone
-      </span>
-      <div
-        class="mx_Flex mx_EmptyRoomList_DefaultPlaceholder"
-        style="--mx-flex-display: flex; --mx-flex-direction: column; --mx-flex-align: center; --mx-flex-justify: center; --mx-flex-gap: var(--cpd-space-4x); --mx-flex-wrap: nowrap;"
-      >
-        <button
-          class="_button_vczzf_8 _has-icon_vczzf_57"
-          data-kind="secondary"
-          data-size="sm"
-          role="button"
-          tabindex="0"
-        >
-          <svg
-            aria-hidden="true"
-            fill="currentColor"
-            height="20"
-            viewBox="0 0 24 24"
-            width="20"
-            xmlns="http://www.w3.org/2000/svg"
-          >
-            <path
-              d="M10 12q-1.65 0-2.825-1.175T6 8t1.175-2.825T10 4t2.825 1.175T14 8t-1.175 2.825T10 12m-8 6v-.8q0-.85.438-1.562.437-.713 1.162-1.088a14.8 14.8 0 0 1 3.15-1.163A13.8 13.8 0 0 1 10 13q1.65 0 3.25.387 1.6.388 3.15 1.163.724.375 1.163 1.087Q18 16.35 18 17.2v.8q0 .824-.587 1.413A1.93 1.93 0 0 1 16 20H4q-.824 0-1.412-.587A1.93 1.93 0 0 1 2 18m2 0h12v-.8a.97.97 0 0 0-.5-.85q-1.35-.675-2.725-1.012a11.6 11.6 0 0 0-5.55 0Q5.85 15.675 4.5 16.35a.97.97 0 0 0-.5.85zm6-8q.825 0 1.412-.588Q12 8.826 12 8q0-.824-.588-1.412A1.93 1.93 0 0 0 10 6q-.825 0-1.412.588A1.93 1.93 0 0 0 8 8q0 .825.588 1.412Q9.175 10 10 10m7 1h2v2q0 .424.288.713.287.287.712.287.424 0 .712-.287A.97.97 0 0 0 21 13v-2h2q.424 0 .712-.287A.97.97 0 0 0 24 10a.97.97 0 0 0-.288-.713A.97.97 0 0 0 23 9h-2V7a.97.97 0 0 0-.288-.713A.97.97 0 0 0 20 6a.97.97 0 0 0-.712.287A.97.97 0 0 0 19 7v2h-2a.97.97 0 0 0-.712.287A.97.97 0 0 0 16 10q0 .424.288.713.287.287.712.287"
-            />
-          </svg>
-          New message
-        </button>
-      </div>
-    </div>
+      class="mx_RoomListSkeleton"
+    />
   </section>
 </DocumentFragment>
 `;
@@ -473,68 +434,8 @@ exports[`<RoomListPanel /> should render the RoomListSearch component when UICom
       </button>
     </div>
     <div
-      class="mx_Flex mx_EmptyRoomList_GenericPlaceholder"
-      data-testid="empty-room-list"
-      style="--mx-flex-display: flex; --mx-flex-direction: column; --mx-flex-align: stretch; --mx-flex-justify: center; --mx-flex-gap: var(--cpd-space-2x); --mx-flex-wrap: nowrap;"
-    >
-      <span
-        class="mx_EmptyRoomList_GenericPlaceholder_title"
-      >
-        No chats yet
-      </span>
-      <span
-        class="mx_EmptyRoomList_GenericPlaceholder_description"
-      >
-        Get started by messaging someone or by creating a room
-      </span>
-      <div
-        class="mx_Flex mx_EmptyRoomList_DefaultPlaceholder"
-        style="--mx-flex-display: flex; --mx-flex-direction: column; --mx-flex-align: center; --mx-flex-justify: center; --mx-flex-gap: var(--cpd-space-4x); --mx-flex-wrap: nowrap;"
-      >
-        <button
-          class="_button_vczzf_8 _has-icon_vczzf_57"
-          data-kind="secondary"
-          data-size="sm"
-          role="button"
-          tabindex="0"
-        >
-          <svg
-            aria-hidden="true"
-            fill="currentColor"
-            height="20"
-            viewBox="0 0 24 24"
-            width="20"
-            xmlns="http://www.w3.org/2000/svg"
-          >
-            <path
-              d="M10 12q-1.65 0-2.825-1.175T6 8t1.175-2.825T10 4t2.825 1.175T14 8t-1.175 2.825T10 12m-8 6v-.8q0-.85.438-1.562.437-.713 1.162-1.088a14.8 14.8 0 0 1 3.15-1.163A13.8 13.8 0 0 1 10 13q1.65 0 3.25.387 1.6.388 3.15 1.163.724.375 1.163 1.087Q18 16.35 18 17.2v.8q0 .824-.587 1.413A1.93 1.93 0 0 1 16 20H4q-.824 0-1.412-.587A1.93 1.93 0 0 1 2 18m2 0h12v-.8a.97.97 0 0 0-.5-.85q-1.35-.675-2.725-1.012a11.6 11.6 0 0 0-5.55 0Q5.85 15.675 4.5 16.35a.97.97 0 0 0-.5.85zm6-8q.825 0 1.412-.588Q12 8.826 12 8q0-.824-.588-1.412A1.93 1.93 0 0 0 10 6q-.825 0-1.412.588A1.93 1.93 0 0 0 8 8q0 .825.588 1.412Q9.175 10 10 10m7 1h2v2q0 .424.288.713.287.287.712.287.424 0 .712-.287A.97.97 0 0 0 21 13v-2h2q.424 0 .712-.287A.97.97 0 0 0 24 10a.97.97 0 0 0-.288-.713A.97.97 0 0 0 23 9h-2V7a.97.97 0 0 0-.288-.713A.97.97 0 0 0 20 6a.97.97 0 0 0-.712.287A.97.97 0 0 0 19 7v2h-2a.97.97 0 0 0-.712.287A.97.97 0 0 0 16 10q0 .424.288.713.287.287.712.287"
-            />
-          </svg>
-          New message
-        </button>
-        <button
-          class="_button_vczzf_8 _has-icon_vczzf_57"
-          data-kind="secondary"
-          data-size="sm"
-          role="button"
-          tabindex="0"
-        >
-          <svg
-            aria-hidden="true"
-            fill="currentColor"
-            height="20"
-            viewBox="0 0 24 24"
-            width="20"
-            xmlns="http://www.w3.org/2000/svg"
-          >
-            <path
-              d="m8.566 17-.944 4.094q-.086.406-.372.656t-.687.25q-.543 0-.887-.469a1.18 1.18 0 0 1-.2-1.031l.801-3.5H3.158q-.572 0-.916-.484a1.27 1.27 0 0 1-.2-1.078 1.12 1.12 0 0 1 1.116-.938H6.85l1.145-5h-3.12q-.57 0-.915-.484a1.27 1.27 0 0 1-.2-1.078A1.12 1.12 0 0 1 4.875 7h3.691l.945-4.094q.085-.406.372-.656.286-.25.686-.25.544 0 .887.469.345.468.2 1.031l-.8 3.5h4.578l.944-4.094q.085-.406.372-.656.286-.25.687-.25.543 0 .887.469t.2 1.031L17.723 7h3.119q.573 0 .916.484.343.485.2 1.079a1.12 1.12 0 0 1-1.116.937H17.15l-1.145 5h3.12q.57 0 .915.484.343.485.2 1.079a1.12 1.12 0 0 1-1.116.937h-3.691l-.944 4.094q-.087.406-.373.656t-.686.25q-.544 0-.887-.469a1.18 1.18 0 0 1-.2-1.031l.8-3.5zm.573-2.5h4.578l1.144-5h-4.578z"
-            />
-          </svg>
-          New room
-        </button>
-      </div>
-    </div>
+      class="mx_RoomListSkeleton"
+    />
   </section>
 </DocumentFragment>
 `;

test/unit-tests/stores/room-list-v3/RoomListStoreV3-test.ts

@@ -10,13 +10,12 @@ import { logger } from "matrix-js-sdk/src/logger";
 
 import type { MatrixClient } from "matrix-js-sdk/src/matrix";
 import type { RoomNotificationState } from "../../../../src/stores/notifications/RoomNotificationState";
-import { RoomListStoreV3Class } from "../../../../src/stores/room-list-v3/RoomListStoreV3";
+import { LISTS_UPDATE_EVENT, RoomListStoreV3Class } from "../../../../src/stores/room-list-v3/RoomListStoreV3";
 import { AsyncStoreWithClient } from "../../../../src/stores/AsyncStoreWithClient";
 import { RecencySorter } from "../../../../src/stores/room-list-v3/skip-list/sorters/RecencySorter";
 import { mkEvent, mkMessage, mkSpace, stubClient, upsertRoomStateEvents } from "../../../test-utils";
 import { getMockedRooms } from "./skip-list/getMockedRooms";
 import { AlphabeticSorter } from "../../../../src/stores/room-list-v3/skip-list/sorters/AlphabeticSorter";
-import { LISTS_UPDATE_EVENT } from "../../../../src/stores/room-list/RoomListStore";
 import dispatcher from "../../../../src/dispatcher/dispatcher";
 import SpaceStore from "../../../../src/stores/spaces/SpaceStore";
 import { MetaSpace, UPDATE_SELECTED_SPACE } from "../../../../src/stores/spaces";