Add a few more UIComponent flags, and ensure they are used in existing code

src/SlashCommands.tsx

@@ -22,14 +22,14 @@ import { User } from "matrix-js-sdk/src/models/user";
 import { Direction } from 'matrix-js-sdk/src/models/event-timeline';
 import { EventType } from "matrix-js-sdk/src/@types/event";
 import * as ContentHelpers from 'matrix-js-sdk/src/content-helpers';
-import { parseFragment as parseHtml, Element as ChildElement } from "parse5";
+import { Element as ChildElement, parseFragment as parseHtml } from "parse5";
 import { logger } from "matrix-js-sdk/src/logger";
 import { IContent } from 'matrix-js-sdk/src/models/event';
 import { SlashCommand as SlashCommandEvent } from "matrix-analytics-events/types/typescript/SlashCommand";
 
 import { MatrixClientPeg } from './MatrixClientPeg';
 import dis from './dispatcher/dispatcher';
-import { _t, _td, newTranslatableError, ITranslatableError } from './languageHandler';
+import { _t, _td, ITranslatableError, newTranslatableError } from './languageHandler';
 import Modal from './Modal';
 import MultiInviter from './utils/MultiInviter';
 import { linkifyAndSanitizeHtml } from './HtmlUtils';
@@ -933,7 +933,7 @@ export const Commands = [
         command: 'addwidget',
         args: '<url | embed code | Jitsi url>',
         description: _td('Adds a custom widget by URL to the room'),
-        isEnabled: () => SettingsStore.getValue(UIFeature.Widgets),
+        isEnabled: () => SettingsStore.getValue(UIFeature.Widgets) && shouldShowComponent(UIComponent.AddIntegrations),
         runFn: function(roomId, widgetUrl) {
             if (!widgetUrl) {
                 return reject(newTranslatableError("Please supply a widget URL or embed code"));

src/components/structures/LeftPanel.tsx

@@ -44,6 +44,8 @@ import RoomBreadcrumbs from "../views/rooms/RoomBreadcrumbs";
 import SettingsStore from "../../settings/SettingsStore";
 import UserMenu from "./UserMenu";
 import { KeyBindingAction } from "../../accessibility/KeyboardShortcuts";
+import { shouldShowComponent } from "../../customisations/helpers/UIComponents";
+import { UIComponent } from "../../settings/UIFeature";
 
 interface IProps {
     isMinimized: boolean;
@@ -368,7 +370,7 @@ export default class LeftPanel extends React.Component<IProps, IState> {
         let rightButton: JSX.Element;
         if (this.state.showBreadcrumbs === BreadcrumbsMode.Labs) {
             rightButton = <RecentlyViewedButton />;
-        } else if (this.state.activeSpace === MetaSpace.Home) {
+        } else if (this.state.activeSpace === MetaSpace.Home && shouldShowComponent(UIComponent.ExploreRooms)) {
             rightButton = <AccessibleTooltipButton
                 className="mx_LeftPanel_exploreButton"
                 onClick={this.onExplore}

src/components/views/right_panel/RoomSummaryCard.tsx

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import React, { useCallback, useState, useEffect, useContext } from "react";
+import React, { useCallback, useContext, useEffect, useState } from "react";
 import classNames from "classnames";
 import { Room } from "matrix-js-sdk/src/models/room";
 
@@ -38,7 +38,7 @@ import AccessibleTooltipButton from "../elements/AccessibleTooltipButton";
 import WidgetStore, { IApp } from "../../../stores/WidgetStore";
 import { E2EStatus } from "../../../utils/ShieldUtils";
 import RoomContext from "../../../contexts/RoomContext";
-import { UIFeature } from "../../../settings/UIFeature";
+import { UIComponent, UIFeature } from "../../../settings/UIFeature";
 import { ChevronFace, ContextMenuTooltipButton, useContextMenu } from "../../structures/ContextMenu";
 import WidgetContextMenu from "../context_menus/WidgetContextMenu";
 import { useRoomMemberCount } from "../../../hooks/useRoomMembers";
@@ -50,6 +50,7 @@ import UIStore from "../../../stores/UIStore";
 import ExportDialog from "../dialogs/ExportDialog";
 import RightPanelStore from "../../../stores/right-panel/RightPanelStore";
 import PosthogTrackers from "../../../PosthogTrackers";
+import { shouldShowComponent } from "../../../customisations/helpers/UIComponents";
 
 interface IProps {
     room: Room;
@@ -327,7 +328,11 @@ const RoomSummaryCard: React.FC<IProps> = ({ room, onClose }) => {
             </Button>
         </Group>
 
-        { SettingsStore.getValue(UIFeature.Widgets) && <AppsSection room={room} /> }
+        {
+            SettingsStore.getValue(UIFeature.Widgets)
+            && shouldShowComponent(UIComponent.AddIntegrations)
+            && <AppsSection room={room} />
+        }
     </BaseCard>;
 };
 

src/components/views/rooms/NewRoomIntro.tsx

@@ -135,7 +135,7 @@ const NewRoomIntro = () => {
         }
 
         let buttons;
-        if (parentSpace) {
+        if (parentSpace && shouldShowComponent(UIComponent.InviteUsers)) {
             buttons = <div className="mx_NewRoomIntro_buttons">
                 <AccessibleButton
                     className="mx_NewRoomIntro_inviteButton"

src/components/views/rooms/RoomListHeader.tsx

@@ -63,6 +63,8 @@ import { BetaPill } from "../beta/BetaCard";
 import PosthogTrackers from "../../../PosthogTrackers";
 import { ViewRoomPayload } from "../../../dispatcher/payloads/ViewRoomPayload";
 import { useWebSearchMetrics } from "../dialogs/SpotlightDialog";
+import { shouldShowComponent } from "../../../customisations/helpers/UIComponents";
+import { UIComponent } from "../../../settings/UIFeature";
 
 const contextMenuBelow = (elementRect: DOMRect) => {
     // align the context menu's icons with the icon which opened the context menu
@@ -210,6 +212,14 @@ const RoomListHeader = ({ spacePanelDisabled, onVisibilityChange }: IProps) => {
     const communityId = CommunityPrototypeStore.instance.getSelectedCommunityId();
     const canAddRooms = activeSpace?.currentState?.maySendStateEvent(EventType.SpaceChild, cli.getUserId());
 
+    const canCreateRooms = shouldShowComponent(UIComponent.CreateRooms);
+    const canExploreRooms = shouldShowComponent(UIComponent.ExploreRooms);
+
+    // If the user can't do anything on the plus menu, don't show it. This aims to target the
+    // plus menu shown on the Home tab primarily: the user has options to use the menu for
+    // communities and spaces, but is at risk of no options on the Home tab.
+    const canShowPlusMenu = canCreateRooms || canExploreRooms || activeSpace || communityId;
+
     let contextMenu: JSX.Element;
     if (mainMenuDisplayed) {
         let ContextMenuComponent;
@@ -320,12 +330,12 @@ const RoomListHeader = ({ spacePanelDisabled, onVisibilityChange }: IProps) => {
             </IconizedContextMenuOptionList>
         </IconizedContextMenu>;
     } else if (plusMenuDisplayed) {
-        contextMenu = <IconizedContextMenu
-            {...contextMenuBelow(plusMenuHandle.current.getBoundingClientRect())}
-            onFinished={closePlusMenu}
-            compact
-        >
-            <IconizedContextMenuOptionList first>
+        let startChatOpt: JSX.Element;
+        let createRoomOpt: JSX.Element;
+        let joinRoomOpt: JSX.Element;
+
+        if (canCreateRooms) {
+            startChatOpt = (
                 <IconizedContextMenuOption
                     label={_t("Start new chat")}
                     iconClassName="mx_RoomListHeader_iconStartChat"
@@ -336,6 +346,8 @@ const RoomListHeader = ({ spacePanelDisabled, onVisibilityChange }: IProps) => {
                         closePlusMenu();
                     }}
                 />
+            );
+            createRoomOpt = (
                 <IconizedContextMenuOption
                     label={_t("Create new room")}
                     iconClassName="mx_RoomListHeader_iconCreateRoom"
@@ -347,6 +359,10 @@ const RoomListHeader = ({ spacePanelDisabled, onVisibilityChange }: IProps) => {
                         closePlusMenu();
                     }}
                 />
+            );
+        }
+        if (canExploreRooms) {
+            joinRoomOpt = (
                 <IconizedContextMenuOption
                     label={_t("Join public room")}
                     iconClassName="mx_RoomListHeader_iconExplore"
@@ -357,6 +373,18 @@ const RoomListHeader = ({ spacePanelDisabled, onVisibilityChange }: IProps) => {
                         closePlusMenu();
                     }}
                 />
+            );
+        }
+
+        contextMenu = <IconizedContextMenu
+            {...contextMenuBelow(plusMenuHandle.current.getBoundingClientRect())}
+            onFinished={closePlusMenu}
+            compact
+        >
+            <IconizedContextMenuOptionList first>
+                { startChatOpt }
+                { createRoomOpt }
+                { joinRoomOpt }
             </IconizedContextMenuOptionList>
         </IconizedContextMenu>;
     }
@@ -397,13 +425,13 @@ const RoomListHeader = ({ spacePanelDisabled, onVisibilityChange }: IProps) => {
     return <div className="mx_RoomListHeader">
         { contextMenuButton }
         { pendingRoomJoinSpinner }
-        <ContextMenuTooltipButton
+        { canShowPlusMenu && <ContextMenuTooltipButton
             inputRef={plusMenuHandle}
             onClick={openPlusMenu}
             isExpanded={plusMenuDisplayed}
             className="mx_RoomListHeader_plusButton"
             title={_t("Add")}
-        />
+        /> }
 
         { contextMenu }
     </div>;

src/settings/UIFeature.ts

@@ -36,7 +36,33 @@ export enum UIFeature {
 }
 
 export enum UIComponent {
+    /**
+     * Components that lead to a user being invited.
+     */
     InviteUsers = "UIComponent.sendInvites",
+
+    /**
+     * Components that lead to a room being created that aren't already
+     * guarded by some other condition (ie: "only if you can edit this
+     * space" is *not* guarded by this component, but "start DM" is).
+     */
     CreateRooms = "UIComponent.roomCreation",
+
+    /**
+     * Components that lead to a Space being created that aren't already
+     * guarded by some other condition (ie: "only if you can add subspaces"
+     * is *not* guarded by this component, but "create new space" is).
+     */
     CreateSpaces = "UIComponent.spaceCreation",
+
+    /**
+     * Components that lead to the public room directory.
+     */
+    ExploreRooms = "UIComponent.exploreRooms",
+
+    /**
+     * Components that lead to the user being able to easily add widgets
+     * and integrations to the room, such as from the room information card.
+     */
+    AddIntegrations = "UIComponent.addIntegrations",
 }

src/utils/space.tsx

@@ -44,6 +44,8 @@ import SpacePreferencesDialog, { SpacePreferenceTab } from "../components/views/
 import PosthogTrackers from "../PosthogTrackers";
 import { ButtonEvent } from "../components/views/elements/AccessibleButton";
 import { AfterLeaveRoomPayload } from "../dispatcher/payloads/AfterLeaveRoomPayload";
+import { shouldShowComponent } from "../customisations/helpers/UIComponents";
+import { UIComponent } from "../settings/UIFeature";
 
 export const shouldShowSpaceSettings = (space: Room) => {
     const userId = space.client.getUserId();
@@ -110,8 +112,10 @@ export const showCreateNewRoom = async (space: Room): Promise<boolean> => {
 };
 
 export const shouldShowSpaceInvite = (space: Room) =>
-    (space?.getMyMembership() === "join" && space.canInvite(space.client.getUserId())) ||
-    space.getJoinRule() === JoinRule.Public;
+    (
+        (space?.getMyMembership() === "join" && space.canInvite(space.client.getUserId())) ||
+        space.getJoinRule() === JoinRule.Public
+    ) && shouldShowComponent(UIComponent.InviteUsers);
 
 export const showSpaceInvite = (space: Room, initialText = ""): void => {
     if (space.getJoinRule() === "public") {