[8.x] [Security Solution][Notes] - limit visible text from note content on notes management page (#195296)

x-pack/plugins/security_solution/public/notes/components/note_content.test.tsx

@@ -0,0 +1,28 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { render } from '@testing-library/react';
+import React from 'react';
+import { NoteContent } from './note_content';
+import { NOTE_CONTENT_BUTTON_TEST_ID, NOTE_CONTENT_POPOVER_TEST_ID } from './test_ids';
+
+const note = 'note-text';
+
+describe('NoteContent', () => {
+  it('should render a note and the popover', () => {
+    const { getByTestId, getByText } = render(<NoteContent note={note} />);
+
+    const button = getByTestId(NOTE_CONTENT_BUTTON_TEST_ID);
+
+    expect(button).toBeInTheDocument();
+    expect(getByText(note)).toBeInTheDocument();
+
+    button.click();
+
+    expect(getByTestId(NOTE_CONTENT_POPOVER_TEST_ID)).toBeInTheDocument();
+  });
+});

x-pack/plugins/security_solution/public/notes/components/note_content.tsx

@@ -0,0 +1,73 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import React, { memo, useCallback, useMemo, useState } from 'react';
+import { EuiButtonEmpty, EuiMarkdownFormat, EuiPopover, useEuiTheme } from '@elastic/eui';
+import { i18n } from '@kbn/i18n';
+import { css } from '@emotion/react';
+import { NOTE_CONTENT_BUTTON_TEST_ID, NOTE_CONTENT_POPOVER_TEST_ID } from './test_ids';
+
+const OPEN_POPOVER = i18n.translate('xpack.securitySolution.notes.expandRow.buttonLabel', {
+  defaultMessage: 'Expand',
+});
+
+export interface NoteContentProps {
+  /**
+   * The note content to display
+   */
+  note: string;
+}
+
+/**
+ * Renders the note content to be displayed in the notes management table.
+ * The content is truncated with an expand button to show the full content within the row.
+ */
+export const NoteContent = memo(({ note }: NoteContentProps) => {
+  const { euiTheme } = useEuiTheme();
+
+  const [isPopoverOpen, setIsPopoverOpen] = useState(false);
+
+  const togglePopover = useCallback(() => setIsPopoverOpen((value) => !value), []);
+  const closePopover = useCallback(() => setIsPopoverOpen(false), []);
+
+  const button = useMemo(
+    () => (
+      <EuiButtonEmpty
+        title={OPEN_POPOVER}
+        aria-label={OPEN_POPOVER}
+        color="text"
+        flush="left"
+        onClick={togglePopover}
+        data-test-subj={NOTE_CONTENT_BUTTON_TEST_ID}
+        css={css`
+          height: ${euiTheme.size.l};
+          white-space: nowrap;
+          overflow: hidden;
+          text-overflow: ellipsis;
+        `}
+      >
+        {note}
+      </EuiButtonEmpty>
+    ),
+    [euiTheme.size.l, note, togglePopover]
+  );
+
+  return (
+    <EuiPopover
+      button={button}
+      isOpen={isPopoverOpen}
+      closePopover={closePopover}
+      panelStyle={{ maxWidth: '50%', maxHeight: '50%', overflow: 'auto' }}
+    >
+      <EuiMarkdownFormat textSize="s" data-test-subj={NOTE_CONTENT_POPOVER_TEST_ID}>
+        {note}
+      </EuiMarkdownFormat>
+    </EuiPopover>
+  );
+});
+
+NoteContent.displayName = 'NoteContent';

x-pack/plugins/security_solution/public/notes/components/test_ids.ts

@@ -17,3 +17,5 @@ export const DELETE_NOTE_BUTTON_TEST_ID = `${PREFIX}DeleteNotesButton` as const;
 export const OPEN_TIMELINE_BUTTON_TEST_ID = `${PREFIX}OpenTimelineButton` as const;
 export const OPEN_FLYOUT_BUTTON_TEST_ID = `${PREFIX}OpenFlyoutButton` as const;
 export const TIMELINE_DESCRIPTION_COMMENT_TEST_ID = `${PREFIX}TimelineDescriptionComment` as const;
+export const NOTE_CONTENT_BUTTON_TEST_ID = `${PREFIX}NoteContentButton` as const;
+export const NOTE_CONTENT_POPOVER_TEST_ID = `${PREFIX}NoteContentPopover` as const;

x-pack/plugins/security_solution/public/notes/pages/note_management_page.tsx

@@ -44,6 +44,7 @@ import { DeleteConfirmModal } from '../components/delete_confirm_modal';
 import * as i18n from './translations';
 import { OpenFlyoutButtonIcon } from '../components/open_flyout_button';
 import { OpenTimelineButtonIcon } from '../components/open_timeline_button';
+import { NoteContent } from '../components/note_content';
 
 const columns: Array<EuiBasicTableColumn<Note>> = [
   {
@@ -94,6 +95,7 @@ const columns: Array<EuiBasicTableColumn<Note>> = [
   {
     field: 'note',
     name: i18n.NOTE_CONTENT_COLUMN,
+    render: (note: Note['note']) => <>{note && <NoteContent note={note} />}</>,
   },
   {
     field: 'created',