Page: Use bouncing logo instead of loading spinner for fallback (#79028)

* use bouncing logo instead of loading spinner for page loader

* translate loading text

* update unit test

* extract bouncing logo out into component

public/app/core/components/BouncingLoader/BouncingLoader.tsx

@@ -0,0 +1,95 @@
+import { css, keyframes } from '@emotion/css';
+import React from 'react';
+
+import { GrafanaTheme2 } from '@grafana/data';
+import { useStyles2 } from '@grafana/ui';
+
+import { t } from '../../internationalization';
+
+export function BouncingLoader() {
+  const styles = useStyles2(getStyles);
+
+  return (
+    <div
+      className={styles.container}
+      aria-live="polite"
+      role="status"
+      aria-label={t('bouncing-loader.label', 'Loading')}
+    >
+      <div className={styles.bounce}>
+        <img alt="" src="public/img/grafana_icon.svg" className={styles.logo} />
+      </div>
+    </div>
+  );
+}
+
+const fadeIn = keyframes({
+  '0%': {
+    opacity: 0,
+    animationTimingFunction: 'cubic-bezier(0, 0, 0.5, 1)',
+  },
+  '100%': {
+    opacity: 1,
+  },
+});
+
+const bounce = keyframes({
+  'from, to': {
+    transform: 'translateY(0px)',
+    animationTimingFunction: 'cubic-bezier(0.3, 0, 0.1, 1)',
+  },
+  '50%': {
+    transform: 'translateY(-50px)',
+    animationTimingFunction: 'cubic-bezier(0.9, 0, 0.7, 1)',
+  },
+});
+
+const squash = keyframes({
+  '0%': {
+    transform: 'scaleX(1.3) scaleY(0.8)',
+    animationTimingFunction: 'cubic-bezier(0.3, 0, 0.1, 1)',
+  },
+  '15%': {
+    transform: 'scaleX(0.75) scaleY(1.25)',
+    animationTimingFunction: 'cubic-bezier(0, 0, 0.7, 0.75)',
+  },
+  '55%': {
+    transform: 'scaleX(1.05) scaleY(0.95)',
+    animationTimingFunction: 'cubic-bezier(0.9, 0, 1, 1)',
+  },
+  '95%': {
+    transform: 'scaleX(0.75) scaleY(1.25)',
+    animationTimingFunction: 'cubic-bezier(0, 0, 0, 1)',
+  },
+  '100%': {
+    transform: 'scaleX(1.3) scaleY(0.8)',
+    animationTimingFunction: 'cubic-bezier(0, 0, 0.7, 1)',
+  },
+});
+
+const getStyles = (theme: GrafanaTheme2) => ({
+  container: css({
+    opacity: 0,
+    animationName: fadeIn,
+    animationIterationCount: 1,
+    animationDuration: '0.9s',
+    animationDelay: '0.5s',
+    animationFillMode: 'forwards',
+  }),
+
+  bounce: css({
+    textAlign: 'center',
+    animationName: bounce,
+    animationDuration: '0.9s',
+    animationIterationCount: 'infinite',
+  }),
+
+  logo: css({
+    display: 'inline-block',
+    animationName: squash,
+    animationDuration: '0.9s',
+    animationIterationCount: 'infinite',
+    width: '60px',
+    height: '60px',
+  }),
+});

public/app/core/navigation/GrafanaRoute.test.tsx

@@ -53,7 +53,7 @@ describe('GrafanaRoute', () => {
 
     setup({ route: { component: PageComponent, path: '' } });
 
-    expect(await screen.findByText('Loading...')).toBeInTheDocument();
+    expect(await screen.findByLabelText('Loading')).toBeInTheDocument();
   });
 
   it('Shows error on page error', async () => {

public/app/core/navigation/GrafanaRouteLoading.tsx

@@ -1,19 +1,27 @@
-import { css } from '@emotion/css';
+import { css, cx } from '@emotion/css';
 import React from 'react';
 
-import { LoadingPlaceholder, useStyles2 } from '@grafana/ui';
+import { GrafanaTheme2 } from '@grafana/data';
+import { config } from '@grafana/runtime';
+import { useStyles2 } from '@grafana/ui';
+
+import { BouncingLoader } from '../components/BouncingLoader/BouncingLoader';
 
 export function GrafanaRouteLoading() {
   const styles = useStyles2(getStyles);
 
   return (
-    <div className={styles.loadingPage}>
+    <div
-      <LoadingPlaceholder text={'Loading...'} />
+      className={cx(styles.loadingPage, {
+        [styles.loadingPageDockedNav]: config.featureToggles.dockedMegaMenu,
+      })}
+    >
+      <BouncingLoader />
     </div>
   );
 }
 
-const getStyles = () => ({
+const getStyles = (theme: GrafanaTheme2) => ({
   loadingPage: css({
     height: '100%',
     flexDrection: 'column',
@@ -21,4 +29,7 @@ const getStyles = () => ({
     justifyContent: 'center',
     alignItems: 'center',
   }),
+  loadingPageDockedNav: css({
+    backgroundColor: theme.colors.background.primary,
+  }),
 });

public/locales/de-DE/grafana.json

@@ -25,6 +25,9 @@
       "user": "Nutzer"
     }
   },
+  "bouncing-loader": {
+    "label": ""
+  },
   "browse-dashboards": {
     "action": {
       "cancel-button": "Abbrechen",

public/locales/en-US/grafana.json

@@ -25,6 +25,9 @@
       "user": "User"
     }
   },
+  "bouncing-loader": {
+    "label": "Loading"
+  },
   "browse-dashboards": {
     "action": {
       "cancel-button": "Cancel",

public/locales/es-ES/grafana.json

@@ -25,6 +25,9 @@
       "user": "Usuario"
     }
   },
+  "bouncing-loader": {
+    "label": ""
+  },
   "browse-dashboards": {
     "action": {
       "cancel-button": "Cancelar",

public/locales/fr-FR/grafana.json

@@ -25,6 +25,9 @@
       "user": "Utilisateur"
     }
   },
+  "bouncing-loader": {
+    "label": ""
+  },
   "browse-dashboards": {
     "action": {
       "cancel-button": "Annuler",

public/locales/pseudo-LOCALE/grafana.json

@@ -25,6 +25,9 @@
       "user": "Ůşęř"
     }
   },
+  "bouncing-loader": {
+    "label": "Ŀőäđįʼnģ"
+  },
   "browse-dashboards": {
     "action": {
       "cancel-button": "Cäʼnčęľ",

public/locales/zh-Hans/grafana.json

@@ -25,6 +25,9 @@
       "user": "用户"
     }
   },
+  "bouncing-loader": {
+    "label": ""
+  },
   "browse-dashboards": {
     "action": {
       "cancel-button": "取消",

public/views/index.html

@@ -50,7 +50,7 @@
         animation-name: preloader-fade-in;
         animation-iteration-count: 1;
         animation-duration: 0.9s;
-        animation-delay: 1.35s;
+        animation-delay: 0.5s;
         animation-fill-mode: forwards;
       }
 
@@ -81,7 +81,7 @@
         opacity: 0;
         animation-name: preloader-fade-in;
         animation-duration: 0.9s;
-        animation-delay: 1.8s;
+        animation-delay: 0.5s;
         animation-fill-mode: forwards;
       }
 
@@ -172,10 +172,9 @@
     <div class="preloader">
       <div class="preloader__enter">
         <div class="preloader__bounce">
-          <div class="preloader__logo"></div>
+          <div class="preloader__logo" aria-live="polite" role="status" aria-label="Loading Grafana"></div>
         </div>
       </div>
-      <div class="preloader__text">Loading Grafana</div>
       <div class="preloader__text preloader__text--fail">
         <p>
           <strong>If you're seeing this Grafana has failed to load its application files</strong>