feat: add tooltip for Other in grade distribution (#709)

* feat: add tooltip

* refactor: lint happy

* chore: lint

---------

Co-authored-by: Derek Chen <derex1987@gmail.com>

src/views/components/common/Tooltip.tsx

@@ -0,0 +1,44 @@
+import clsx from 'clsx';
+import type { PropsWithChildren, ReactNode } from 'react';
+import React from 'react';
+
+interface TooltipProps {
+    className?: string;
+    contentClassName?: string;
+    content: ReactNode;
+    offsetX: number;
+    offsetY: number;
+    maxWidth?: number;
+}
+
+/**
+ * Tooltip that displays content on hover
+ */
+export default function Tooltip({
+    className,
+    contentClassName,
+    content,
+    offsetX,
+    offsetY,
+    maxWidth,
+    children,
+}: PropsWithChildren<TooltipProps>): JSX.Element {
+    return (
+        <span className={clsx('relative inline-flex group', className)}>
+            {children}
+            <span
+                className={clsx(
+                    'pointer-events-none absolute rounded-md bg-white px-3 py-2 text-xs invisible opacity-0 transition-opacity group-hover:visible group-hover:opacity-100 whitespace-normal break-words',
+                    contentClassName
+                )}
+                style={{
+                    marginTop: offsetY,
+                    marginLeft: offsetX,
+                    maxWidth,
+                }}
+            >
+                {content}
+            </span>
+        </span>
+    );
+}

src/views/components/injected/CourseCatalogInjectedPopup/GradeDistribution.tsx

@@ -3,6 +3,7 @@ import type { Distribution, LetterGrade } from '@shared/types/Distribution';
 import { extendedColors } from '@shared/types/ThemeColors';
 import Link from '@views/components/common/Link';
 import Text from '@views/components/common/Text/Text';
+import Tooltip from '@views/components/common/Tooltip';
 import {
     NoDataError,
     queryAggregateDistribution,
@@ -12,10 +13,12 @@ import Highcharts from 'highcharts';
 import HighchartsReact from 'highcharts-react-official';
 import type { ChangeEvent } from 'react';
 import React, { useEffect, useMemo, useRef, useState } from 'react';
+import { renderToStaticMarkup } from 'react-dom/server';
 import Skeleton from 'react-loading-skeleton';
 
 const UT_GRADE_DISTRIBUTION_URL = 'https://reports.utexas.edu/spotlight-data/ut-course-grade-distributions';
-
+const TOOLTIP_CONTENT =
+    "The 'Other' grade category includes all non-standard letter grades, including: In Progress, Incomplete, Permanent Incomplete, Oblit, Q-Drop, Withdrawn, Credit, No Credit, Satisfactory, Unsatisfactory, and Registered on CR/F or CR/NC basis.";
 interface GradeDistributionProps {
     course: Course;
 }
@@ -126,6 +129,25 @@ export default function GradeDistribution({ course }: GradeDistributionProps): J
                     lineHeight: 'normal',
                     fontStyle: 'normal',
                 },
+                useHTML: true,
+                formatter() {
+                    // eslint-disable-next-line react/no-this-in-sfc
+                    const val = `${this.value}`;
+
+                    return val === 'Other'
+                        ? renderToStaticMarkup(
+                              <Tooltip
+                                  content={TOOLTIP_CONTENT}
+                                  className='underline'
+                                  offsetX={-425}
+                                  offsetY={-175}
+                                  maxWidth={500}
+                              >
+                                  Other
+                              </Tooltip>
+                          )
+                        : val;
+                },
             },
             title: {
                 text: 'Grades',
@@ -135,6 +157,7 @@ export default function GradeDistribution({ course }: GradeDistributionProps): J
                     fontWeight: '400',
                 },
             },
+
             categories: ['A', 'A-', 'B+', 'B', 'B-', 'C+', 'C', 'C-', 'D+', 'D', 'D-', 'F', 'Other'],
             tickInterval: 1,
             tickWidth: 1,

src/views/components/settings/ContributorCardSkeleton.tsx

@@ -4,10 +4,10 @@ import React from 'react';
  * Lightweight skeleton placeholder for contributor cards while data loads
  */
 export const ContributorCardSkeleton: React.FC = () => (
-    <div className='border border-gray-300 rounded bg-ut-gray/10 p-4 animate-pulse'>
-        <div className='h-4 w-3/4 bg-gray-300 rounded mb-2' />
-        <div className='h-3 w-1/2 bg-gray-300 rounded mb-1' />
-        <div className='h-3 w-1/4 bg-gray-300 rounded' />
+    <div className='animate-pulse border border-gray-300 rounded bg-ut-gray/10 p-4'>
+        <div className='mb-2 h-4 w-3/4 rounded bg-gray-300' />
+        <div className='mb-1 h-3 w-1/2 rounded bg-gray-300' />
+        <div className='h-3 w-1/4 rounded bg-gray-300' />
     </div>
 );