News: Add loading skeleton (#79009)

* convert to emotion object syntax

* add news skeleton

.betterer.results

@@ -6339,18 +6339,6 @@ exports[`better eslint`] = {
     "public/app/plugins/panel/logs/LogsPanel.tsx:5381": [
       [0, 0, 0, "Do not use any type assertions.", "0"]
     ],
-    "public/app/plugins/panel/news/component/News.tsx:5381": [
-      [0, 0, 0, "Styles should be written using objects.", "0"],
-      [0, 0, 0, "Styles should be written using objects.", "1"],
-      [0, 0, 0, "Styles should be written using objects.", "2"],
-      [0, 0, 0, "Styles should be written using objects.", "3"],
-      [0, 0, 0, "Styles should be written using objects.", "4"],
-      [0, 0, 0, "Styles should be written using objects.", "5"],
-      [0, 0, 0, "Styles should be written using objects.", "6"],
-      [0, 0, 0, "Styles should be written using objects.", "7"],
-      [0, 0, 0, "Styles should be written using objects.", "8"],
-      [0, 0, 0, "Styles should be written using objects.", "9"]
-    ],
     "public/app/plugins/panel/nodeGraph/Edge.tsx:5381": [
       [0, 0, 0, "Do not use any type assertions.", "0"]
     ],

public/app/core/components/AppChrome/News/NewsWrapper.tsx

@@ -3,7 +3,7 @@ import React, { useEffect } from 'react';
 import { useMeasure } from 'react-use';
 
 import { GrafanaTheme2 } from '@grafana/data';
-import { LoadingPlaceholder, useStyles2 } from '@grafana/ui';
+import { useStyles2 } from '@grafana/ui';
 import { News } from 'app/plugins/panel/news/component/News';
 import { useNewsFeed } from 'app/plugins/panel/news/useNewsFeed';
 
@@ -19,25 +19,28 @@ export function NewsWrapper({ feedUrl }: NewsWrapperProps) {
     getNews();
   }, [getNews]);
 
-  if (state.loading || state.error) {
-    return (
-      <div className={styles.innerWrapper}>
-        {state.loading && <LoadingPlaceholder text="Loading..." />}
-        {state.error && state.error.message}
-      </div>
-    );
-  }
-
-  if (!state.value) {
-    return null;
+  if (state.error) {
+    return <div className={styles.innerWrapper}>{state.error && state.error.message}</div>;
   }
 
   return (
     <div ref={widthRef}>
-      {widthMeasure.width > 0 &&
-        state.value.map((_, index) => (
-          <News key={index} index={index} showImage width={widthMeasure.width} data={state.value} />
-        ))}
+      {state.loading ? (
+        <>
+          <News.Skeleton showImage width={widthMeasure.width} />
+          <News.Skeleton showImage width={widthMeasure.width} />
+          <News.Skeleton showImage width={widthMeasure.width} />
+          <News.Skeleton showImage width={widthMeasure.width} />
+          <News.Skeleton showImage width={widthMeasure.width} />
+        </>
+      ) : (
+        <>
+          {widthMeasure.width > 0 &&
+            state.value?.map((_, index) => (
+              <News key={index} index={index} showImage width={widthMeasure.width} data={state.value} />
+            ))}
+        </>
+      )}
       <div className={styles.grot}>
         <a href="https://grafana.com/blog/" target="_blank" rel="noreferrer" title="Go to Grafana labs blog">
           <img src="public/img/grot-news.svg" alt="Grot reading news" />

public/app/plugins/panel/news/component/News.tsx

@@ -1,5 +1,6 @@
 import { css, cx } from '@emotion/css';
 import React from 'react';
+import Skeleton from 'react-loading-skeleton';
 
 import { DataFrameView, GrafanaTheme2, textUtil, dateTimeFormat } from '@grafana/data';
 import { useStyles2 } from '@grafana/ui';
@@ -45,68 +46,93 @@ export function News({ width, showImage, data, index }: NewsItemProps) {
   );
 }
 
+const NewsSkeleton = ({ width, showImage }: Pick<NewsItemProps, 'width' | 'showImage'>) => {
+  const styles = useStyles2(getStyles);
+  const useWideLayout = width > 600;
+
+  return (
+    <div className={cx(styles.item, useWideLayout && styles.itemWide)}>
+      {showImage && (
+        <Skeleton
+          containerClassName={cx(styles.socialImage, useWideLayout && styles.socialImageWide)}
+          width={useWideLayout ? '250px' : '100%'}
+          height={useWideLayout ? '150px' : width * 0.5}
+        />
+      )}
+      <div className={styles.body}>
+        <Skeleton containerClassName={styles.date} width={60} />
+        <Skeleton containerClassName={styles.title} width={250} />
+        <Skeleton containerClassName={styles.content} width="100%" count={6} />
+      </div>
+    </div>
+  );
+};
+
+News.Skeleton = NewsSkeleton;
+
 const getStyles = (theme: GrafanaTheme2) => ({
-  container: css`
-    height: 100%;
-  `,
-  item: css`
-    display: flex;
-    padding: ${theme.spacing(1)};
-    position: relative;
-    margin-bottom: 4px;
-    margin-right: ${theme.spacing(1)};
-    border-bottom: 2px solid ${theme.colors.border.weak};
-    background: ${theme.colors.background.primary};
-    flex-direction: column;
-    flex-shrink: 0;
-  `,
-  itemWide: css`
-    flex-direction: row;
-  `,
-  body: css`
-    display: flex;
-    flex-direction: column;
-  `,
-  socialImage: css`
-    display: flex;
-    align-items: center;
-    margin-bottom: ${theme.spacing(1)};
-    > img {
-      width: 100%;
-      border-radius: ${theme.shape.radius.default} ${theme.shape.radius.default} 0 0;
-    }
-  `,
-  socialImageWide: css`
-    margin-right: ${theme.spacing(2)};
-    margin-bottom: 0;
-    > img {
-      width: 250px;
-      border-radius: ${theme.shape.radius.default};
-    }
-  `,
-  link: css`
-    color: ${theme.colors.text.link};
-    display: inline-block;
+  container: css({
+    height: '100%',
+  }),
+  item: css({
+    display: 'flex',
+    padding: theme.spacing(1),
+    position: 'relative',
+    marginBottom: theme.spacing(0.5),
+    marginRight: theme.spacing(1),
+    borderBottom: `2px solid ${theme.colors.border.weak}`,
+    background: theme.colors.background.primary,
+    flexDirection: 'column',
+    flexShrink: 0,
+  }),
+  itemWide: css({
+    flexDirection: 'row',
+  }),
+  body: css({
+    display: 'flex',
+    flexDirection: 'column',
+    flex: 1,
+  }),
+  socialImage: css({
+    display: 'flex',
+    alignItems: 'center',
+    marginBottom: theme.spacing(1),
+    '> img': {
+      width: '100%',
+      borderRadius: `${theme.shape.radius.default} ${theme.shape.radius.default} 0 0`,
+    },
+  }),
+  socialImageWide: css({
+    marginRight: theme.spacing(2),
+    marginBottom: 0,
+    '> img': {
+      width: '250px',
+      borderRadius: theme.shape.radius.default,
+    },
+  }),
+  link: css({
+    color: theme.colors.text.link,
+    display: 'inline-block',
 
-    &:hover {
-      color: ${theme.colors.text.link};
-      text-decoration: underline;
-    }
-  `,
-  title: css`
-    font-size: 16px;
-    margin-bottom: ${theme.spacing(0.5)};
-  `,
-  content: css`
-    p {
-      margin-bottom: 4px;
-      color: ${theme.colors.text};
-    }
-  `,
-  date: css`
-    margin-bottom: ${theme.spacing(0.5)};
-    font-weight: 500;
-    border-radius: 0 0 0 ${theme.shape.radius.default};
-    color: ${theme.colors.text.secondary};
-  `,
+    '&:hover': {
+      color: theme.colors.text.link,
+      textDecoration: 'underline',
+    },
+  }),
+  title: css({
+    fontSize: '16px',
+    marginBottom: theme.spacing(0.5),
+  }),
+  content: css({
+    p: {
+      marginBottom: theme.spacing(0.5),
+      color: theme.colors.text.primary,
+    },
+  }),
+  date: css({
+    marginBottom: theme.spacing(0.5),
+    fontWeight: 500,
+    borderRadius: `0 0 0 ${theme.shape.radius.default}`,
+    color: theme.colors.text.secondary,
+  }),
 });