feat: add resive observer of Notification and content with ref to wra…

src/components/Notification/Notification.scss

@@ -182,8 +182,7 @@ $notificationSideActionsOffset: $notificationSideActionsWidth + 8px;
     }
 
     #{$block}:hover &__actions_side-actions,
-    #{$block}:focus-within &__actions_side-actions,
-    &__actions_side-actions:focus-within {
+    #{$block}:has(:focus-visible) &__actions_side-actions {
         opacity: 1;
     }
 

src/components/Notification/Notification.tsx

@@ -11,7 +11,10 @@ import './Notification.scss';
 
 const b = block('notification');
 
-type Props = {notification: NotificationProps};
+type Props = {
+    wrapperRef?: React.RefObject<HTMLDivElement>;
+    notification: NotificationProps;
+};
 
 interface ClickableElementProps {
     notification: NotificationProps;
@@ -20,9 +23,10 @@ interface ClickableElementProps {
 }
 
 export const Notification = React.memo(function Notification(props: Props) {
+    const ref = React.useRef<HTMLDivElement>(null);
     const {t} = i18n.useTranslation();
     const mobile = useMobile();
-    const {notification} = props;
+    const {wrapperRef, notification} = props;
     const {
         title,
         content,
@@ -58,11 +62,20 @@ export const Notification = React.memo(function Notification(props: Props) {
         <div className={b('actions', {'bottom-actions': true})}>{notification.bottomActions}</div>
     ) : null;
 
-    const renderedContent = (
-        <div className={b('content-wrapper')}>
-            <div className={b('content')}>{content}</div>
-        </div>
-    );
+    let renderedContent;
+    if (typeof content === 'function') {
+        renderedContent = (
+            <div className={b('content-wrapper')}>
+                <div className={b('content')}>{content({wrapperRef})}</div>
+            </div>
+        );
+    } else {
+        renderedContent = (
+            <div className={b('content-wrapper')}>
+                <div className={b('content')}>{content}</div>
+            </div>
+        );
+    }
 
     const renderedSourceText =
         source?.title || formattedDate ? (
@@ -121,6 +134,7 @@ export const Notification = React.memo(function Notification(props: Props) {
 
     return (
         <div
+            ref={ref}
             className={b(layoutModifiers, notification.className)}
             onMouseEnter={notification.onMouseEnter}
             onMouseLeave={notification.onMouseLeave}

src/components/Notification/NotificationWithSwipe.tsx

@@ -14,7 +14,11 @@ const b = block('notification');
 const notificationWrapperCls = b('notification-wrapper');
 const swipeActionContainerCls = b('swipe-action-container');
 
-type Props = {notification: NotificationProps; swipeThreshold?: number};
+type Props = {
+    notification: NotificationProps;
+    swipeThreshold?: number;
+    wrapperRef?: React.RefObject<HTMLDivElement>;
+};
 
 export const NotificationWithSwipe = React.memo(function NotificationWithSwipe(props: Props) {
     const swipeThreshold = props.swipeThreshold ?? 0.4;
@@ -24,7 +28,7 @@ export const NotificationWithSwipe = React.memo(function NotificationWithSwipe(p
     }
 
     const ref = React.useRef<HTMLDivElement>(null);
-    const notification = props.notification;
+    const {notification, wrapperRef} = props;
     const swipeActions = notification.swipeActions;
     const leftAction = swipeActions && 'left' in swipeActions ? swipeActions.left : undefined;
     const rightAction = swipeActions && 'right' in swipeActions ? swipeActions.right : undefined;
@@ -132,7 +136,7 @@ export const NotificationWithSwipe = React.memo(function NotificationWithSwipe(p
             >
                 {leftAction ? renderAction(leftAction) : null}
                 <div className={notificationWrapperCls}>
-                    <Notification {...props} />
+                    <Notification notification={notification} wrapperRef={wrapperRef} />
                 </div>
                 {rightAction ? renderAction(rightAction) : null}
             </div>

src/components/Notification/definitions.ts

@@ -24,7 +24,9 @@ export type NotificationSwipeActionsProps =
 
 export type NotificationProps = {
     id: string;
-    content: React.ReactNode;
+    content:
+        | React.ReactNode
+        | ((props: {wrapperRef?: React.RefObject<HTMLDivElement>}) => React.ReactNode);
 
     title?: React.ReactNode;
     formattedDate?: React.ReactNode;

src/components/Notifications/NotificationWrapper.tsx

@@ -19,11 +19,12 @@ export const NotificationWrapper = (props: {
 
     const {notification, swipeThreshold} = props;
     const mobile = useMobile();
-    const [wrapperMaxHeight, setWrapperMaxHeight] = React.useState<number | undefined>(undefined);
     const [isRemoved, setIsRemoved] = React.useState(false);
 
     React.useEffect(() => {
-        if (!ref.current) {
+        const element = ref.current;
+
+        if (!element) {
             if (!notification.archived && isRemoved) {
                 setIsRemoved(false);
             }
@@ -34,36 +35,34 @@ export const NotificationWrapper = (props: {
             const listener = (event: TransitionEvent) => {
                 if (event.propertyName === 'max-height') {
                     setIsRemoved(true);
-                    ref.current?.removeEventListener('transitionend', listener);
+                    element.removeEventListener('transitionend', listener);
                 }
             };
 
-            ref.current.addEventListener('transitionend', listener);
+            element.addEventListener('transitionend', listener);
+
+            element.style.maxHeight = `${element.scrollHeight}px`;
+            element.style.transition = 'max-height 0.3s';
 
-            ref.current.style.transition = 'max-height 0.3s';
-            setWrapperMaxHeight(0);
+            // Firefox batches style changes made within a single frame, so setting maxHeight
+            // to scrollHeight and then to 0px in the same frame skips the transition entirely.
+            // Two nested requestAnimationFrame calls guarantee the browser commits the initial
+            // maxHeight in one frame before applying 0px in the next, so the animation runs.
+            requestAnimationFrame(() => {
+                requestAnimationFrame(() => {
+                    element.style.maxHeight = '0px';
+                });
+            });
 
             return () => {
-                ref.current?.removeEventListener('transitionend', listener);
+                element.removeEventListener('transitionend', listener);
             };
-        } else {
-            setIsRemoved(false);
-
-            setTimeout(() => {
-                if (!ref.current) return;
-
-                ref.current.style.transition = 'none';
-                ref.current.style.maxHeight = 'none';
-
-                const maxHeight = ref.current?.getBoundingClientRect().height ?? 0;
-                setWrapperMaxHeight(maxHeight);
-            }, 0);
-
-            return () => {};
         }
-    }, [ref, notification.archived, isRemoved]);
 
-    const style = wrapperMaxHeight === undefined ? {} : {maxHeight: `${wrapperMaxHeight}px`};
+        setIsRemoved(false);
+
+        return () => {};
+    }, [notification.archived, isRemoved]);
 
     if (isRemoved) {
         return null;
@@ -78,15 +77,15 @@ export const NotificationWrapper = (props: {
                     active: Boolean(notification.onClick),
                 })}
                 ref={ref}
-                style={style}
             >
                 {mobile && notification.swipeActions ? (
                     <NotificationWithSwipe
                         notification={notification}
                         swipeThreshold={swipeThreshold}
+                        wrapperRef={ref}
                     />
                 ) : (
-                    <Notification notification={notification} />
+                    <Notification notification={notification} wrapperRef={ref} />
                 )}
             </div>
         </li>

src/components/Notifications/__stories__/mockData.tsx

@@ -1,7 +1,7 @@
 import * as React from 'react';
 
 import {Archive, ArrowRotateLeft, CircleCheck, Funnel, TrashBin} from '@gravity-ui/icons';
-import {DropdownMenu, Icon, Link} from '@gravity-ui/uikit';
+import {Disclosure, DropdownMenu, Flex, Icon, Link} from '@gravity-ui/uikit';
 
 import {NotificationAction} from '../../Notification/NotificationAction';
 import {NotificationSwipeAction} from '../../Notification/NotificationSwipeAction';
@@ -89,6 +89,28 @@ export const notificationBottomActions: JSX.Element = (
     </React.Fragment>
 );
 
+export const LongNotificationContent = (props: {wrapperRef?: React.RefObject<HTMLDivElement>}) => {
+    const {wrapperRef} = props;
+
+    const handleUpdate = (expanded: boolean) => {
+        if (!expanded) {
+            requestAnimationFrame(() => {
+                wrapperRef?.current?.scrollIntoView({block: 'nearest', behavior: 'smooth'});
+            });
+        }
+    };
+
+    return (
+        <Disclosure summary="Collapsed content" onUpdate={handleUpdate}>
+            <Flex direction="column" gap={1}>
+                {Array.from({length: 20}, (_, index) => (
+                    <i key={index}>{'Long expanded content. '}</i>
+                ))}
+            </Flex>
+        </Disclosure>
+    );
+};
+
 export const mockNotifications: NotificationProps[] = [
     {
         id: 'tracker',
@@ -153,6 +175,12 @@ export const mockNotifications: NotificationProps[] = [
         swipeActions: notificationsMockSwipeActions,
         href: 'https://ya.ru',
     },
+    {
+        id: 'looooong-content',
+        content: (contentProps) => <LongNotificationContent {...contentProps} />,
+        formattedDate: '29 seconds ago',
+        swipeActions: notificationsMockSwipeActions,
+    },
     {
         id: 'yandex',
         content: (