Change 'type' prop on badges to 'forceDot' (#12327)

* Change 'type' prop on badges tio 'forceDot'

Which, hopefully, better represents what it actually does. Tidies
up some of the logic.

Split out from https://github.com/matrix-org/matrix-react-sdk/pull/12254

* Missed a file

* More comments

* Oops, there is no count here.

* Back out the logic refactor of StatelessNotificationBadge

because it was also updating the logic for mark as unread badges and
rewriting the ternary to the previous logic would be quite complex.

* Fix doc comment

Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>

* Clarify doc on displaying the count

* Update doc for the forceDot param here too.

---------

Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>

src/components/views/rooms/EventTile.tsx

@@ -1311,7 +1311,7 @@ export class UnwrappedEventTile extends React.Component<EventTileProps, IState>
                             <UnreadNotificationBadge
                                 room={room || undefined}
                                 threadId={this.props.mxEvent.getId()}
-                                type="dot"
+                                forceDot={true}
                             />
                         </div>
                         {isRenderingNotification && room ? (

src/components/views/rooms/NotificationBadge/StatelessNotificationBadge.tsx

@@ -28,7 +28,12 @@ interface Props {
     count: number;
     level: NotificationLevel;
     knocked?: boolean;
-    type?: "badge" | "dot";
+    /**
+     * If true, where we would normally show a badge, we instead show a dot. No numeric count will
+     * be displayed (but may affect whether the the dot is displayed). See class doc
+     * for the difference between the two.
+     */
+    forceDot?: boolean;
 }
 
 interface ClickableProps extends Props {
@@ -39,8 +44,17 @@ interface ClickableProps extends Props {
     tabIndex?: number;
 }
 
+/**
+ * A notification indicator that conveys what activity / notifications the user has in whatever
+ * context it is being used.
+ *
+ * Can either be a 'badge': a small circle with a number in it (the 'count'), or a 'dot': a smaller, empty circle.
+ * The two can be used to convey the same meaning but in different contexts, for example: for unread
+ * notifications in the room list, it may have a green badge with the number of unread notifications,
+ * but somewhere else it may just have a green dot as a more compact representation of the same information.
+ */
 export const StatelessNotificationBadge = forwardRef<HTMLDivElement, XOR<Props, ClickableProps>>(
-    ({ symbol, count, level, knocked, type = "badge", ...props }, ref) => {
+    ({ symbol, count, level, knocked, forceDot = false, ...props }, ref) => {
         const hideBold = useSettingValue("feature_hidebold");
 
         // Don't show a badge if we don't need to
@@ -61,10 +75,12 @@ export const StatelessNotificationBadge = forwardRef<HTMLDivElement, XOR<Props,
             mx_NotificationBadge_visible: isEmptyBadge || knocked ? true : hasUnreadCount,
             mx_NotificationBadge_level_notification: level == NotificationLevel.Notification,
             mx_NotificationBadge_level_highlight: level >= NotificationLevel.Highlight,
-            mx_NotificationBadge_dot: (isEmptyBadge && !knocked) || type === "dot",
             mx_NotificationBadge_knocked: knocked,
-            mx_NotificationBadge_2char: type === "badge" && symbol && symbol.length > 0 && symbol.length < 3,
-            mx_NotificationBadge_3char: type === "badge" && symbol && symbol.length > 2,
+
+            // At most one of mx_NotificationBadge_dot, mx_NotificationBadge_2char, mx_NotificationBadge_3char
+            mx_NotificationBadge_dot: (isEmptyBadge && !knocked) || forceDot,
+            mx_NotificationBadge_2char: !forceDot && symbol && symbol.length > 0 && symbol.length < 3,
+            mx_NotificationBadge_3char: !forceDot && symbol && symbol.length > 2,
         });
 
         if (props.onClick) {

src/components/views/rooms/NotificationBadge/UnreadNotificationBadge.tsx

@@ -23,11 +23,15 @@ import { StatelessNotificationBadge } from "./StatelessNotificationBadge";
 interface Props {
     room?: Room;
     threadId?: string;
-    type?: "badge" | "dot";
+    /**
+     * If true, where we would normally show a badge, we instead show a dot. No numeric count will
+     * be displayed.
+     */
+    forceDot?: boolean;
 }
 
-export function UnreadNotificationBadge({ room, threadId, type }: Props): JSX.Element {
+export function UnreadNotificationBadge({ room, threadId, forceDot }: Props): JSX.Element {
     const { symbol, count, level } = useUnreadNotifications(room, threadId);
 
-    return <StatelessNotificationBadge symbol={symbol} count={count} level={level} type={type} />;
+    return <StatelessNotificationBadge symbol={symbol} count={count} level={level} forceDot={forceDot} />;
 }

src/components/views/spaces/threads-activity-centre/ThreadsActivityCentre.tsx

@@ -147,7 +147,7 @@ function ThreadsActivityCentreRow({ room, onClick, notificationLevel }: ThreadsA
             label={room.name}
             Icon={<DecoratedRoomAvatar room={room} size="32px" />}
         >
-            <StatelessNotificationBadge level={notificationLevel} count={0} symbol={null} type="dot" />
+            <StatelessNotificationBadge level={notificationLevel} count={0} symbol={null} forceDot={true} />
         </MenuItem>
     );
 }

test/components/views/rooms/NotificationBadge/StatelessNotificationBadge-test.tsx

@@ -35,4 +35,23 @@ describe("StatelessNotificationBadge", () => {
         expect(container.querySelector(".mx_NotificationBadge_dot")).not.toBeInTheDocument();
         expect(container.querySelector(".mx_NotificationBadge_knocked")).toBeInTheDocument();
     });
+
+    it("has badge style for notification", () => {
+        const { container } = render(
+            <StatelessNotificationBadge symbol={null} count={3} level={NotificationLevel.Notification} />,
+        );
+        expect(container.querySelector(".mx_NotificationBadge_dot")).not.toBeInTheDocument();
+    });
+
+    it("has dot style for notification when forced", () => {
+        const { container } = render(
+            <StatelessNotificationBadge
+                symbol={null}
+                count={3}
+                level={NotificationLevel.Notification}
+                forceDot={true}
+            />,
+        );
+        expect(container.querySelector(".mx_NotificationBadge_dot")).toBeInTheDocument();
+    });
 });