Show spaces beta prompt when viewing a space without the beta

res/css/structures/_SpaceRoomView.scss

@@ -123,6 +123,28 @@ $SpaceRoomViewInnerWidth: 428px;
         box-sizing: border-box;
         box-shadow: 2px 15px 30px $dialog-shadow-color;
         border-radius: 8px;
+        position: relative;
+
+        // XXX remove this when spaces leaves Beta
+        .mx_BetaCard_betaPill {
+            position: absolute;
+            right: 24px;
+            top: 32px;
+        }
+        // XXX remove this when spaces leaves Beta
+        .mx_SpaceRoomView_preview_spaceBetaPrompt {
+            font-size: $font-15px;
+            line-height: $font-24px;
+            color: $secondary-fg-color;
+            margin-top: 14px;
+
+            .mx_AccessibleButton_kind_link {
+                display: inline;
+                padding: 0;
+                font-size: inherit;
+                line-height: inherit;
+            }
+        }
 
         .mx_SpaceRoomView_preview_inviter {
             display: flex;

res/css/views/beta/_BetaCard.scss

@@ -69,6 +69,10 @@ limitations under the License.
     color: #FFFFFF;
     display: inline-block;
     vertical-align: text-bottom;
+
+    &.mx_BetaCard_betaPill_clickable {
+        cursor: pointer;
+    }
 }
 
 $pulse-color: $accent-color-alt;

src/components/structures/RoomView.tsx

@@ -1910,7 +1910,7 @@ export default class RoomView extends React.Component<IProps, IState> {
             );
         }
 
-        if (SettingsStore.getValue("feature_spaces") && this.state.room?.isSpaceRoom()) {
+        if (this.state.room?.isSpaceRoom()) {
             return <SpaceRoomView
                 space={this.state.room}
                 justCreatedOpts={this.props.justCreatedOpts}

src/components/structures/SpaceRoomView.tsx

@@ -51,6 +51,10 @@ import MemberAvatar from "../views/avatars/MemberAvatar";
 import {useStateToggle} from "../../hooks/useStateToggle";
 import SpaceStore from "../../stores/SpaceStore";
 import FacePile from "../views/elements/FacePile";
+import {BetaPill} from "../views/beta/BetaCard";
+import {USER_LABS_TAB} from "../views/dialogs/UserSettingsDialog";
+import SettingsStore from "../../settings/SettingsStore";
+import dis from "../../dispatcher/dispatcher";
 
 interface IProps {
     space: Room;
@@ -127,15 +131,40 @@ const SpaceInfo = ({ space }) => {
     </div>
 };
 
+const onBetaClick = () => {
+    defaultDispatcher.dispatch({
+        action: Action.ViewUserSettings,
+        initialTabId: USER_LABS_TAB,
+    });
+};
+
 const SpacePreview = ({ space, onJoinButtonClicked, onRejectButtonClicked }) => {
     const cli = useContext(MatrixClientContext);
     const myMembership = useMyRoomMembership(space);
 
     const [busy, setBusy] = useState(false);
 
+    const spacesEnabled = SettingsStore.getValue("feature_spaces");
+
     let inviterSection;
     let joinButtons;
-    if (myMembership === "invite") {
+    if (myMembership === "join") {
+        // XXX remove this when spaces leaves Beta
+        joinButtons = (
+            <AccessibleButton
+                kind="danger"
+                onClick={() => {
+                    setBusy(true);
+                    dis.dispatch({
+                        action: "leave_room",
+                        room_id: space.roomId,
+                    });
+                }}
+            >
+                { _t("Leave") }
+            </AccessibleButton>
+        );
+    } else if (myMembership === "invite") {
         const inviteSender = space.getMember(cli.getUserId())?.events.member?.getSender();
         const inviter = inviteSender && space.getMember(inviteSender);
 
@@ -171,6 +200,7 @@ const SpacePreview = ({ space, onJoinButtonClicked, onRejectButtonClicked }) =>
                     setBusy(true);
                     onJoinButtonClicked();
                 }}
+                disabled={!spacesEnabled}
             >
                 { _t("Accept") }
             </AccessibleButton>
@@ -183,10 +213,11 @@ const SpacePreview = ({ space, onJoinButtonClicked, onRejectButtonClicked }) =>
                     setBusy(true);
                     onJoinButtonClicked();
                 }}
+                disabled={!spacesEnabled}
             >
                 { _t("Join") }
             </AccessibleButton>
-        )
+        );
     }
 
     if (busy) {
@@ -194,6 +225,7 @@ const SpacePreview = ({ space, onJoinButtonClicked, onRejectButtonClicked }) =>
     }
 
     return <div className="mx_SpaceRoomView_preview">
+        <BetaPill onClick={onBetaClick} />
         { inviterSection }
         <RoomAvatar room={space} height={80} width={80} viewAvatarOnClick={true} />
         <h1 className="mx_SpaceRoomView_preview_name">
@@ -211,6 +243,20 @@ const SpacePreview = ({ space, onJoinButtonClicked, onRejectButtonClicked }) =>
         <div className="mx_SpaceRoomView_preview_joinButtons">
             { joinButtons }
         </div>
+        { !spacesEnabled && <div className="mx_SpaceRoomView_preview_spaceBetaPrompt">
+            { myMembership === "join"
+                ? _t("To view %(spaceName)s, turn on the <a>Spaces beta</a>", {
+                    spaceName: space.name,
+                }, {
+                    a: sub => <AccessibleButton onClick={onBetaClick} kind="link">{ sub }</AccessibleButton>,
+                })
+                : _t("To join %(spaceName)s, turn on the <a>Spaces beta</a>", {
+                    spaceName: space.name,
+                }, {
+                    a: sub => <AccessibleButton onClick={onBetaClick} kind="link">{ sub }</AccessibleButton>,
+                })
+            }
+        </div> }
     </div>;
 };
 
@@ -631,7 +677,7 @@ export default class SpaceRoomView extends React.PureComponent<IProps, IState> {
     private renderBody() {
         switch (this.state.phase) {
             case Phase.Landing:
-                if (this.state.myMembership === "join") {
+                if (this.state.myMembership === "join" && SettingsStore.getValue("feature_spaces")) {
                     return <SpaceLanding space={this.props.space} />;
                 } else {
                     return <SpacePreview

src/components/views/beta/BetaCard.tsx

@@ -15,6 +15,7 @@ limitations under the License.
 */
 
 import React from "react";
+import classNames from "classnames";
 
 import {_t} from "../../../languageHandler";
 import AccessibleButton from "../elements/AccessibleButton";
@@ -27,7 +28,12 @@ interface IProps {
 }
 
 export const BetaPill = ({ onClick }: { onClick?: () => void }) => {
-    return <span className="mx_BetaCard_betaPill" onClick={onClick}>
+    return <span
+        className={classNames("mx_BetaCard_betaPill", {
+            mx_BetaCard_betaPill_clickable: !!onClick,
+        })}
+        onClick={onClick}
+    >
         { _t("Beta") }
     </span>;
 };

src/i18n/strings/en_EN.json

@@ -2660,6 +2660,8 @@
     "Public space": "Public space",
     "Private space": "Private space",
     "<inviter/> invites you": "<inviter/> invites you",
+    "To view %(spaceName)s, turn on the <a>Spaces beta</a>": "To view %(spaceName)s, turn on the <a>Spaces beta</a>",
+    "To join %(spaceName)s, turn on the <a>Spaces beta</a>": "To join %(spaceName)s, turn on the <a>Spaces beta</a>",
     "Add existing rooms & spaces": "Add existing rooms & spaces",
     "Welcome to <name/>": "Welcome to <name/>",
     "Random": "Random",