[EuiContextMenu] Support new renderItem custom content in items a…

…rrays (#7510)

changelogs/upcoming/7510.md

@@ -0,0 +1 @@
+- Updated `EuiContextMenu` with a new `panels.items.renderItem` property, which allows rendering completely custom items next to standard `EuiContextMenuItem` objects

src-docs/src/views/context_menu/context_menu_example.js

@@ -9,6 +9,7 @@ import {
   EuiContextMenu,
   EuiContextMenuItem,
   EuiContextMenuPanel,
+  EuiTitle,
 } from '../../../../src/components';
 import { EuiContextMenuPanelDescriptor } from '!!prop-loader!../../../../src/components/context_menu/context_menu';
 
@@ -173,6 +174,9 @@ export const ContextMenuExample = {
       ],
       text: (
         <>
+          <EuiTitle>
+            <h3>Custom panels</h3>
+          </EuiTitle>
           <p>
             Context menu panels can be passed React elements through the{' '}
             <EuiCode>content</EuiCode> prop instead of <EuiCode>items</EuiCode>.
@@ -184,16 +188,24 @@ export const ContextMenuExample = {
             <EuiCode language="ts">width: [number of pixels]</EuiCode> to the
             panel tree.
           </p>
+          <EuiTitle>
+            <h3>Custom items</h3>
+          </EuiTitle>
           <p>
             You can add separator lines in the <EuiCode>items</EuiCode> prop if
             you define an item as{' '}
             <EuiCode language="ts">{'{isSeparator: true}'}</EuiCode>. This will
-            pass the rest of its fields as props to a{' '}
+            pass the rest of the object properties to an{' '}
             <Link to="/layout/horizontal-rule">
               <strong>EuiHorizontalRule</strong>
             </Link>{' '}
             component.
           </p>
+          <p>
+            For completely custom rendered items, you can use the{' '}
+            <EuiCode>{'{renderItem}'}</EuiCode> property to pass a component or
+            any function that returns a JSX node.
+          </p>
         </>
       ),
       demo: <ContextMenuWithContent />,

src-docs/src/views/context_menu/context_menu_with_content.js

@@ -5,6 +5,7 @@ import {
   EuiContextMenu,
   EuiIcon,
   EuiPopover,
+  EuiPopoverFooter,
   EuiSpacer,
   EuiText,
 } from '../../../../src/components';
@@ -64,10 +65,6 @@ export default () => {
           icon: <EuiIcon type="search" size="m" />,
           onClick: closePopover,
         },
-        {
-          isSeparator: true,
-          key: 'sep',
-        },
         {
           name: 'See more',
           icon: 'plusInCircle',
@@ -78,6 +75,19 @@ export default () => {
             content: <Content />,
           },
         },
+        {
+          isSeparator: true,
+          key: 'sep',
+        },
+        {
+          renderItem: () => (
+            <EuiPopoverFooter paddingSize="s">
+              <EuiButton size="s" style={{ marginInlineStart: 'auto' }}>
+                I'm a custom item!
+              </EuiButton>
+            </EuiPopoverFooter>
+          ),
+        },
       ],
     });
   };
@@ -116,7 +126,7 @@ export default () => {
   );
 
   return (
-    <React.Fragment>
+    <>
       <EuiPopover
         id={normalContextMenuPopoverId}
         button={button}
@@ -140,6 +150,6 @@ export default () => {
       >
         <EuiContextMenu initialPanelId={0} panels={dynamicPanels} />
       </EuiPopover>
-    </React.Fragment>
+    </>
   );
 };

src/components/context_menu/context_menu.stories.tsx

@@ -12,6 +12,7 @@ import type { Meta, StoryObj } from '@storybook/react';
 import { EuiPopover } from '../popover';
 import { EuiButton } from '../button';
 import { EuiIcon } from '../icon';
+import { EuiTitle } from '../title';
 
 import { EuiContextMenu, EuiContextMenuProps } from './context_menu';
 
@@ -95,6 +96,23 @@ const panels: EuiContextMenuProps['panels'] = [
         icon: 'user',
         panel: 2,
       },
+      {
+        isSeparator: true,
+      },
+      {
+        renderItem: () => (
+          <EuiTitle
+            size="xxs"
+            css={({ euiTheme }) => ({
+              marginInline: euiTheme.size.s,
+              marginBlockStart: euiTheme.size.m,
+              marginBlockEnd: euiTheme.size.xs,
+            })}
+          >
+            <h3>Custom rendered subtitle</h3>
+          </EuiTitle>
+        ),
+      },
       {
         name: 'Permalinks',
         icon: 'user',

src/components/context_menu/context_menu.test.tsx

@@ -126,6 +126,42 @@ describe('EuiContextMenu', () => {
     expect(container.firstChild).toMatchSnapshot();
   });
 
+  it('allows wildcard content via the `renderItem` prop', () => {
+    const CustomComponent = () => (
+      <div data-test-subj="custom">Hello world</div>
+    );
+
+    const { container, getByTestSubject } = render(
+      <EuiContextMenu
+        panels={[
+          {
+            id: 1,
+            title: 'Testing renderItem',
+            items: [
+              {
+                name: 'Renders an EuiContextMenuItem',
+                panel: 2,
+              },
+              {
+                renderItem: () => <h3 data-test-subj="subtitle">Subtitle</h3>,
+              },
+              {
+                key: 'custom',
+                renderItem: CustomComponent,
+              },
+              ...panel3.items,
+            ],
+          },
+        ]}
+        initialPanelId={1}
+      />
+    );
+
+    expect(container.querySelectorAll('.euiContextMenuItem')).toHaveLength(3);
+    expect(getByTestSubject('subtitle')).toHaveTextContent('Subtitle');
+    expect(getByTestSubject('custom')).toHaveTextContent('Hello world');
+  });
+
   describe('props', () => {
     describe('panels and initialPanelId', () => {
       it('renders the referenced panel', () => {

src/components/context_menu/context_menu.tsx

@@ -12,6 +12,7 @@ import React, {
   CSSProperties,
   ReactElement,
   ReactNode,
+  Fragment,
 } from 'react';
 import classNames from 'classnames';
 
@@ -47,9 +48,21 @@ export interface EuiContextMenuPanelItemSeparator
   key?: string;
 }
 
+export type EuiContextMenuPanelItemRenderCustom = {
+  /**
+   * Allows rendering any custom content alongside your array of context menu items.
+   * Accepts either a component or an inline function component that returns any JSX.
+   */
+  renderItem: (() => ReactNode) | Function;
+  key?: string;
+};
+
 export type EuiContextMenuPanelItemDescriptor = ExclusiveUnion<
-  EuiContextMenuPanelItemDescriptorEntry,
-  EuiContextMenuPanelItemSeparator
+  ExclusiveUnion<
+    EuiContextMenuPanelItemDescriptorEntry,
+    EuiContextMenuPanelItemSeparator
+  >,
+  EuiContextMenuPanelItemRenderCustom
 >;
 
 export interface EuiContextMenuPanelDescriptor {
@@ -313,6 +326,10 @@ export class EuiContextMenuClass extends Component<
 
   renderItems(items: EuiContextMenuPanelItemDescriptor[] = []) {
     return items.map((item, index) => {
+      if (item.renderItem) {
+        return <Fragment key={item.key ?? index}>{item.renderItem()}</Fragment>;
+      }
+
       if (isItemSeparator(item)) {
         const { isSeparator: omit, key = index, ...rest } = item;
         return <EuiHorizontalRule key={key} margin="none" {...rest} />;