From f179b2bc9a0e9ae78325f69917a3b906c42d8bdb Mon Sep 17 00:00:00 2001
From: ldrv565 <40745264+ldrv565@users.noreply.github.com>
Date: Fri, 24 Nov 2023 15:13:34 +0300
Subject: [PATCH] feat: add AsideFallback

---
 README.md                                     | 27 +++++++++----
 rollup.config.js                              |  1 +
 src/components/AsideHeader/AsideHeader.scss   |  4 --
 src/components/AsideHeader/AsideHeader.tsx    | 15 -------
 .../__stories__/AsideHeader.stories.tsx       | 37 ++++++++++++++++-
 .../components/PageLayout/AsideFallback.tsx   | 40 +++++++++++++++++++
 .../components/PageLayout/PageLayout.tsx      | 21 ++++++----
 src/components/AsideHeader/types.tsx          |  1 -
 src/components/index.ts                       |  1 +
 9 files changed, 110 insertions(+), 37 deletions(-)
 create mode 100644 src/components/AsideHeader/components/PageLayout/AsideFallback.tsx

diff --git a/README.md b/README.md
index 3e6f8ac..3d7bf6e 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,7 @@ npm install --dev @gravity-ui/uikit@^3.0.2 @bem-react/classname@1.6.0 react@^16.
 - DrawerItem
 - PageLayout
 - PageLayoutAside
+- AsideFallback
 
 ## Optimization
 
@@ -33,23 +34,35 @@ If your app content needs to be rendered faster than by passing it throw `AsideH
 you may need to switch usage of `AsideHeader` to advanced style with `PageLayout` like this:
 
 ```diff
--import {AsideHeader} from '@gravity-ui/navigation';
-+import {PageLayout} from '@gravity-ui/navigation';
-+
-+const PageLayoutAside = React.lazy(() =>
-+    import('@gravity-ui/navigation').then((module) => ({default: module.PageLayoutAside})),
+--- Main.tsx
++++ Main.tsx
+-import {AsideHeader} from './AsideHeader'
++import {PageLayout, AsideFallback} from '@gravity-ui/navigation';
++const Aside = React.lazy(() =>
++    import('./Aside').then(({Aside}) => ({ default: Aside }))
 +);
 
 -    <AsideHeader renderContent={renderContent} {...restProps} />
 +    <PageLayout>
-+        <Suspense fallback={null}>
-+            <PageLayoutAside {...restProps} />
++        <Suspense fallback={<AsideFallback />}>
++           <Aside />
 +        </Suspense>
 +
 +        <PageLayout.Content>
 +            <ContentExample />
 +        </PageLayout.Content>
 +    </PageLayout>
+--- Aside.tsx
++++ Aside.tsx
+-import {AsideHeader} from '@gravity-ui/navigation';
++import {PageLayoutAside} from '@gravity-ui/navigation';
+
+export const Aside: FC = () => {
+    return (
+-        <AsideHeader {...props}>
++        <PageLayoutAside {...props}/>
+    );
+};
 ```
 
 ## Imports
diff --git a/rollup.config.js b/rollup.config.js
index 05d1c97..ce3ef55 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -21,6 +21,7 @@ const input = [
     'src/components/FooterItem/FooterItem.tsx',
     'src/components/AsideHeader/components/PageLayout/PageLayout.tsx',
     'src/components/AsideHeader/components/PageLayout/PageLayoutAside.tsx',
+    'src/components/AsideHeader/components/PageLayout/AsideFallback.tsx',
 ];
 
 const getPlugins = (outDir) => {
diff --git a/src/components/AsideHeader/AsideHeader.scss b/src/components/AsideHeader/AsideHeader.scss
index 21577ec..fc932b5 100644
--- a/src/components/AsideHeader/AsideHeader.scss
+++ b/src/components/AsideHeader/AsideHeader.scss
@@ -223,10 +223,6 @@ $block: '.#{variables.$ns}aside-header';
         }
     }
 
-    &_reverse #{$block}__pane-container {
-        flex-direction: row-reverse;
-    }
-
     &__content {
         width: calc(100% - var(--gn-aside-header-size));
         z-index: 95;
diff --git a/src/components/AsideHeader/AsideHeader.tsx b/src/components/AsideHeader/AsideHeader.tsx
index 9f45eef..0e284dc 100644
--- a/src/components/AsideHeader/AsideHeader.tsx
+++ b/src/components/AsideHeader/AsideHeader.tsx
@@ -4,21 +4,6 @@ import {AsideHeaderProps} from './types';
 import {PageLayout} from './components/PageLayout/PageLayout';
 import {PageLayoutAside} from './components/PageLayout/PageLayoutAside';
 
-/**
- * Simply usage of AsideHeader:
- * @example
- * <AsideHeader renderContent={renderContent} {...props} />
- *
- * Advanced usage of AsideHeader:
- * @example
- * <PageLayout reverse >
- *  <PageLayout.Content>
- *      <Content />
- *  </PageLayout.Content>
- *
- *  <PageLayoutAside {...props} />
- * </PageLayout>
- */
 export const AsideHeader = React.forwardRef<HTMLDivElement, AsideHeaderProps>(
     ({compact, className, topAlert, ...props}, ref) => {
         return (
diff --git a/src/components/AsideHeader/__stories__/AsideHeader.stories.tsx b/src/components/AsideHeader/__stories__/AsideHeader.stories.tsx
index 2ccd1a2..e3f61c3 100644
--- a/src/components/AsideHeader/__stories__/AsideHeader.stories.tsx
+++ b/src/components/AsideHeader/__stories__/AsideHeader.stories.tsx
@@ -8,6 +8,8 @@ import {PageLayout} from '../components/PageLayout/PageLayout';
 import {PageLayoutAside} from '../components/PageLayout/PageLayoutAside';
 import logoIcon from '../../../../.storybook/assets/logo.svg';
 import {menuItemsShowcase} from './moc';
+import {AsideFallback} from '../components/PageLayout/AsideFallback';
+import {Button} from '@gravity-ui/uikit';
 
 export default {
     title: 'components/AsideHeader',
@@ -34,8 +36,7 @@ const AdvancedUsageTemplate: StoryFn = (args) => {
     const [compact, setCompact] = React.useState(args.initialCompact);
 
     return (
-        <PageLayout reverse compact={compact}>
-            <PageLayout.Content>PageContent</PageLayout.Content>
+        <PageLayout compact={compact}>
             <PageLayoutAside
                 headerDecoration
                 menuItems={menuItemsShowcase}
@@ -48,6 +49,8 @@ const AdvancedUsageTemplate: StoryFn = (args) => {
                 onChangeCompact={setCompact}
                 {...args}
             />
+
+            <PageLayout.Content>PageContent</PageLayout.Content>
         </PageLayout>
     );
 };
@@ -80,3 +83,33 @@ HeaderAlertCentered.args = {
         dense: true,
     },
 };
+
+const fallbackArgs = {
+    headerDecoration: true,
+    subheaderItemsCount: 2,
+};
+
+const FallbackTemplate: StoryFn<typeof fallbackArgs> = ({
+    headerDecoration,
+    subheaderItemsCount,
+}) => {
+    const [compact, setCompact] = React.useState(false);
+
+    return (
+        <PageLayout compact={compact}>
+            <AsideFallback
+                headerDecoration={headerDecoration}
+                subheaderItemsCount={subheaderItemsCount}
+            />
+
+            <PageLayout.Content>
+                <div style={{padding: 16}}>
+                    <Button onClick={() => setCompact((prev) => !prev)}>Toggle compact</Button>
+                </div>
+            </PageLayout.Content>
+        </PageLayout>
+    );
+};
+
+export const Fallback = FallbackTemplate.bind({});
+Fallback.args = fallbackArgs;
diff --git a/src/components/AsideHeader/components/PageLayout/AsideFallback.tsx b/src/components/AsideHeader/components/PageLayout/AsideFallback.tsx
new file mode 100644
index 0000000..90e82d1
--- /dev/null
+++ b/src/components/AsideHeader/components/PageLayout/AsideFallback.tsx
@@ -0,0 +1,40 @@
+import React from 'react';
+import {useAsideHeaderContext} from '../../AsideHeaderContext';
+import headerDividerCollapsedIcon from '../../../../../assets/icons/divider-collapsed.svg';
+import {b} from '../../utils';
+import {Icon} from '@gravity-ui/uikit';
+import {ASIDE_HEADER_COMPACT_WIDTH} from '../../../constants';
+
+export interface Props {
+    headerDecoration?: boolean;
+    subheaderItemsCount?: number;
+}
+
+const ITEM_HEIGHT = 40;
+
+export const AsideFallback: React.FC<Props> = ({headerDecoration, subheaderItemsCount = 0}) => {
+    const {compact} = useAsideHeaderContext();
+
+    const widthVar = compact ? '--gn-aside-header-min-width' : '--gn-aside-header-size';
+
+    const subheaderHeight = (1 + subheaderItemsCount) * ITEM_HEIGHT;
+
+    return (
+        <div className={b('aside')} style={{width: `var(${widthVar})`}}>
+            <div className={b('aside-content', {'with-decoration': headerDecoration})}>
+                <div className={b('header', {'with-decoration': headerDecoration})}>
+                    <div style={{height: subheaderHeight}} />
+                    {compact ? (
+                        <Icon
+                            data={headerDividerCollapsedIcon}
+                            className={b('header-divider')}
+                            width={ASIDE_HEADER_COMPACT_WIDTH}
+                            height="29"
+                        />
+                    ) : null}
+                </div>
+                <div style={{flex: 1}} />
+            </div>
+        </div>
+    );
+};
diff --git a/src/components/AsideHeader/components/PageLayout/PageLayout.tsx b/src/components/AsideHeader/components/PageLayout/PageLayout.tsx
index b0acd78..691a55c 100644
--- a/src/components/AsideHeader/components/PageLayout/PageLayout.tsx
+++ b/src/components/AsideHeader/components/PageLayout/PageLayout.tsx
@@ -1,30 +1,35 @@
-import React, {PropsWithChildren, useMemo} from 'react';
+import React, {PropsWithChildren, Suspense, useMemo} from 'react';
 import {AsideHeaderContextProvider, useAsideHeaderContext} from '../../AsideHeaderContext';
 import {Content, ContentProps} from '../../../Content';
-import {TopPanel} from '..';
 import {ASIDE_HEADER_COMPACT_WIDTH, ASIDE_HEADER_EXPANDED_WIDTH} from '../../../constants';
 import {LayoutProps} from '../../types';
 import {b} from '../../utils';
 
 import '../../AsideHeader.scss';
 
-export interface PageLayoutProps extends PropsWithChildren<LayoutProps> {
-    reverse?: boolean;
-}
+const TopPanel = React.lazy(() =>
+    import('../TopPanel').then((module) => ({default: module.TopPanel})),
+);
 
-const Layout = ({compact, reverse, className, children, topAlert}: PageLayoutProps) => {
+export interface PageLayoutProps extends PropsWithChildren<LayoutProps> {}
+
+const Layout = ({compact, className, children, topAlert}: PageLayoutProps) => {
     const size = compact ? ASIDE_HEADER_COMPACT_WIDTH : ASIDE_HEADER_EXPANDED_WIDTH;
     const asideHeaderContextValue = useMemo(() => ({size, compact}), [compact, size]);
 
     return (
         <AsideHeaderContextProvider value={asideHeaderContextValue}>
             <div
-                className={b({compact, reverse}, className)}
+                className={b({compact}, className)}
                 style={{
                     ...({'--gn-aside-header-size': `${size}px`} as React.CSSProperties),
                 }}
             >
-                {topAlert && <TopPanel topAlert={topAlert} />}
+                {topAlert && (
+                    <Suspense fallback={null}>
+                        <TopPanel topAlert={topAlert} />
+                    </Suspense>
+                )}
                 <div className={b('pane-container')}>{children}</div>
             </div>
         </AsideHeaderContextProvider>
diff --git a/src/components/AsideHeader/types.tsx b/src/components/AsideHeader/types.tsx
index c96dff5..0457386 100644
--- a/src/components/AsideHeader/types.tsx
+++ b/src/components/AsideHeader/types.tsx
@@ -18,7 +18,6 @@ export interface LayoutProps {
 export interface AsideHeaderGeneralProps {
     logo: LogoProps;
     multipleTooltip?: boolean;
-    reverse?: boolean;
     className?: string;
     collapseTitle?: string;
     expandTitle?: string;
diff --git a/src/components/index.ts b/src/components/index.ts
index 7774b35..9da241b 100644
--- a/src/components/index.ts
+++ b/src/components/index.ts
@@ -5,6 +5,7 @@ export {Drawer, DrawerProps, DrawerItemProps, DrawerItem} from './Drawer/Drawer'
 export {FooterItem, FooterItemProps} from './FooterItem/FooterItem';
 export {PageLayout, type PageLayoutProps} from './AsideHeader/components/PageLayout/PageLayout';
 export {PageLayoutAside} from './AsideHeader/components/PageLayout/PageLayoutAside';
+export {AsideFallback} from './AsideHeader/components/PageLayout/AsideFallback';
 export * from './ActionBar';
 export * from './Title';
 export * from './HotkeysPanel';