PanelChrome: adding support for displaying error messages. (#32748)

* adding support to display panel error.

* adding error indicator.

* renaming back to left.

* fixing docs error issues.

* adding release tag.

packages/grafana-ui/src/components/PanelChrome/ErrorIndicator.tsx

@@ -0,0 +1,47 @@
+import React from 'react';
+import { css, cx } from '@emotion/css';
+import { Icon } from '../Icon/Icon';
+import { Tooltip } from '../Tooltip/Tooltip';
+import { useStyles } from '../../themes';
+import { GrafanaTheme } from '@grafana/data';
+
+/**
+ * @internal
+ */
+export type ErrorIndicatorProps = {
+  error?: string;
+  onClick?: () => void;
+};
+
+/**
+ * @internal
+ */
+export const ErrorIndicator: React.FC<ErrorIndicatorProps> = ({ error, onClick }) => {
+  const styles = useStyles(getStyles);
+
+  if (!error) {
+    return null;
+  }
+
+  return (
+    <Tooltip theme="error" content={error}>
+      <Icon
+        onClick={onClick}
+        className={cx(styles.icon, { [styles.clickable]: !!onClick })}
+        size="sm"
+        name="exclamation-triangle"
+      />
+    </Tooltip>
+  );
+};
+
+const getStyles = (theme: GrafanaTheme) => {
+  return {
+    clickable: css`
+      cursor: pointer;
+    `,
+    icon: css`
+      color: ${theme.palette.red88};
+    `,
+  };
+};

packages/grafana-ui/src/components/PanelChrome/LoadingIndicator.tsx

@@ -1,9 +1,14 @@
 import React from 'react';
+import { css, cx } from '@emotion/css';
 import { selectors } from '@grafana/e2e-selectors';
 import { Icon } from '../Icon/Icon';
 import { Tooltip } from '../Tooltip/Tooltip';
+import { useStyles } from '../../themes';
 
-type LoadingIndicatorProps = {
+/**
+ * @internal
+ */
+export type LoadingIndicatorProps = {
   loading: boolean;
   onCancel: () => void;
 };
@@ -12,6 +17,8 @@ type LoadingIndicatorProps = {
  * @internal
  */
 export const LoadingIndicator: React.FC<LoadingIndicatorProps> = ({ onCancel, loading }) => {
+  const styles = useStyles(getStyles);
+
   if (!loading) {
     return null;
   }
@@ -19,7 +26,7 @@ export const LoadingIndicator: React.FC<LoadingIndicatorProps> = ({ onCancel, lo
   return (
     <Tooltip content="Cancel query">
       <Icon
-        className="spin-clockwise"
+        className={cx('spin-clockwise', { [styles.clickable]: !!onCancel })}
         name="sync"
         size="sm"
         onClick={onCancel}
@@ -28,3 +35,11 @@ export const LoadingIndicator: React.FC<LoadingIndicatorProps> = ({ onCancel, lo
     </Tooltip>
   );
 };
+
+const getStyles = () => {
+  return {
+    clickable: css`
+      cursor: pointer;
+    `,
+  };
+};

packages/grafana-ui/src/components/PanelChrome/PanelChrome.story.tsx

@@ -1,22 +1,23 @@
 import React, { useState } from 'react';
-import { withCenteredStory } from '../../utils/storybook/withCenteredStory';
+import { withCenteredStory, withHorizontallyCenteredStory } from '../../utils/storybook/withCenteredStory';
 import { useInterval } from 'react-use';
 import { PanelChrome, PanelPadding } from './PanelChrome';
 import { LoadingIndicator } from './LoadingIndicator';
+import { ErrorIndicator } from './ErrorIndicator';
 import { useTheme } from '../../themes/ThemeContext';
 
 export default {
   title: 'Visualizations/PanelChrome',
   component: PanelChrome,
-  decorators: [withCenteredStory],
+  decorators: [withCenteredStory, withHorizontallyCenteredStory],
   parameters: {
     docs: {},
   },
   argTypes: {
     leftItems: {
       control: {
-        type: 'select',
+        type: 'multi-select',
-        options: ['none', 'loading'],
+        options: ['none', 'loading', 'error'],
       },
     },
     width: {
@@ -33,18 +34,18 @@ export default {
 };
 
 type PanelChromeStoryProps = {
-  leftItems: string;
+  leftItems: string[];
   title: string | undefined;
   padding: PanelPadding;
 };
 
 export const StandardPanel = (props: PanelChromeStoryProps) => {
   const theme = useTheme();
-  const { title, padding } = props;
   const leftItems = mapToItems(props.leftItems);
 
   return (
-    <PanelChrome width={400} height={230} leftItems={leftItems} title={title} padding={padding}>
+    <div style={{ display: 'flex', height: '500px', alignItems: 'center' }}>
+      <PanelChrome {...props} width={400} height={230} leftItems={leftItems}>
         {(innerWidth, innerHeight) => {
           return (
             <div
@@ -62,11 +63,12 @@ export const StandardPanel = (props: PanelChromeStoryProps) => {
           );
         }}
       </PanelChrome>
+    </div>
   );
 };
 
 StandardPanel.args = {
-  leftItems: 'none',
+  leftItems: ['none'],
   title: 'Very long title that should get ellipsis when there is no more space',
 };
 
@@ -77,11 +79,15 @@ const LoadingItem = () => {
   return <LoadingIndicator loading={loading} onCancel={() => setLoading(false)} />;
 };
 
-const mapToItems = (selected: string): React.ReactNode[] | undefined => {
+const mapToItems = (selected: string[]): React.ReactNode[] => {
-  switch (selected) {
+  return selected.map((s) => {
+    switch (s) {
       case 'loading':
-      return [<LoadingItem key="loading" />];
+        return <LoadingItem key="loading" />;
+      case 'error':
+        return <ErrorIndicator error="Could not find datasource with id: 12345" onClick={() => {}} />;
       default:
-      return;
+        return null;
     }
+  });
 };

packages/grafana-ui/src/components/PanelChrome/PanelChrome.tsx

@@ -1,6 +1,6 @@
 import React, { CSSProperties, ReactNode } from 'react';
 import { css } from '@emotion/css';
-import { useStyles, useTheme } from '../../themes';
+import { useTheme, useStyles } from '../../themes';
 import { GrafanaTheme } from '@grafana/data';
 
 /**
@@ -11,7 +11,7 @@ export interface PanelChromeProps {
   height: number;
   title?: string;
   padding?: PanelPadding;
-  leftItems?: React.ReactNode[];
+  leftItems?: React.ReactNode[]; // rightItems will be added later (actions links etc.)
   children: (innerWidth: number, innerHeight: number) => React.ReactNode;
 }
 
@@ -57,6 +57,31 @@ export const PanelChrome: React.FC<PanelChromeProps> = ({
   );
 };
 
+const itemsRenderer = (items: ReactNode[], renderer: (items: ReactNode[]) => ReactNode): ReactNode => {
+  const toRender = React.Children.toArray(items).filter(Boolean);
+  return toRender.length > 0 ? renderer(toRender) : null;
+};
+
+const getHeaderHeight = (theme: GrafanaTheme, title: string, items: ReactNode[]) => {
+  if (title.length > 0 || items.length > 0) {
+    return theme.panelHeaderHeight;
+  }
+  return 0;
+};
+
+const getContentStyle = (padding: string, theme: GrafanaTheme, width: number, headerHeight: number, height: number) => {
+  const chromePadding = padding === 'md' ? theme.panelPadding : 0;
+  const panelBorder = 1 * 2;
+  const innerWidth = width - chromePadding * 2 - panelBorder;
+  const innerHeight = height - headerHeight - chromePadding * 2 - panelBorder;
+
+  const contentStyle: CSSProperties = {
+    padding: chromePadding,
+  };
+
+  return { contentStyle, innerWidth, innerHeight };
+};
+
 const getStyles = (theme: GrafanaTheme) => {
   return {
     container: css`
@@ -89,32 +114,8 @@ const getStyles = (theme: GrafanaTheme) => {
       flex-grow: 1;
     `,
     leftItems: css`
+      display: flex;
       padding-right: ${theme.panelPadding}px;
     `,
   };
 };
-
-const itemsRenderer = (items: ReactNode[], renderer: (items: ReactNode[]) => ReactNode): ReactNode => {
-  const toRender = React.Children.toArray(items).filter(Boolean);
-  return toRender.length > 0 ? renderer(toRender) : null;
-};
-
-const getHeaderHeight = (theme: GrafanaTheme, title: string, items: ReactNode[]) => {
-  if (title.length > 0 || items.length > 0) {
-    return theme.panelHeaderHeight;
-  }
-  return 0;
-};
-
-const getContentStyle = (padding: string, theme: GrafanaTheme, width: number, headerHeight: number, height: number) => {
-  const chromePadding = padding === 'md' ? theme.panelPadding : 0;
-  const panelBorder = 1 * 2;
-  const innerWidth = width - chromePadding * 2 - panelBorder;
-  const innerHeight = height - headerHeight - chromePadding * 2 - panelBorder;
-
-  const contentStyle: CSSProperties = {
-    padding: chromePadding,
-  };
-
-  return { contentStyle, innerWidth, innerHeight };
-};

packages/grafana-ui/src/components/PanelChrome/index.ts

@@ -1,5 +1,6 @@
 import React from 'react';
 import { LoadingIndicator } from './LoadingIndicator';
+import { ErrorIndicator } from './ErrorIndicator';
 import { PanelChrome as PanelChromeComponent, PanelChromeProps } from './PanelChrome';
 
 /**
@@ -12,6 +13,7 @@ export { PanelChromeProps, PanelPadding } from './PanelChrome';
  */
 export interface PanelChromeType extends React.FC<PanelChromeProps> {
   LoadingIndicator: typeof LoadingIndicator;
+  ErrorIndicator: typeof ErrorIndicator;
 }
 
 /**
@@ -19,3 +21,18 @@ export interface PanelChromeType extends React.FC<PanelChromeProps> {
  */
 export const PanelChrome = PanelChromeComponent as PanelChromeType;
 PanelChrome.LoadingIndicator = LoadingIndicator;
+PanelChrome.ErrorIndicator = ErrorIndicator;
+
+/**
+ * Exporting the components for extensibility and since it is a good practice
+ * according to the api-extractor.
+ */
+export {
+  LoadingIndicator as PanelChromeLoadingIndicator,
+  LoadingIndicatorProps as PanelChromeLoadingIndicatorProps,
+} from './LoadingIndicator';
+
+export {
+  ErrorIndicator as PanelChromeErrorIndicator,
+  ErrorIndicatorProps as PanelChromeErrorIndicatorProps,
+} from './ErrorIndicator';

packages/grafana-ui/src/components/index.ts

@@ -77,7 +77,16 @@ export { BarGauge, BarGaugeDisplayMode } from './BarGauge/BarGauge';
 export { GraphTooltipOptions } from './Graph/GraphTooltip/types';
 export { VizRepeater, VizRepeaterRenderValueProps } from './VizRepeater/VizRepeater';
 export { graphTimeFormat, graphTickFormatter } from './Graph/utils';
-export { PanelChrome, PanelChromeProps, PanelPadding, PanelChromeType } from './PanelChrome';
+export {
+  PanelChrome,
+  PanelChromeProps,
+  PanelPadding,
+  PanelChromeType,
+  PanelChromeLoadingIndicator,
+  PanelChromeLoadingIndicatorProps,
+  PanelChromeErrorIndicator,
+  PanelChromeErrorIndicatorProps,
+} from './PanelChrome';
 export { VizLayout, VizLayoutComponentType, VizLayoutLegendProps, VizLayoutProps } from './VizLayout/VizLayout';
 export { VizLegendItem } from './VizLegend/types';
 export { LegendPlacement, LegendDisplayMode, VizLegendOptions } from './VizLegend/models.gen';

packages/grafana-ui/src/types/icon.ts

@@ -56,6 +56,7 @@ export type IconName =
   | 'envelope'
   | 'exchange-alt'
   | 'exclamation-triangle'
+  | 'exclamation'
   | 'external-link-alt'
   | 'eye-slash'
   | 'eye'