Granfana ui/tag components (#22964)

* Add Tag component

* Add Tag story

* Add TagList

* Group Tab and TabList

* Fix typechecks

* Remove Meta

* Use forwardRef for the Tag

* Add actions instead of console.log

* Add previews

packages/grafana-ui/src/components/Tags/Tag.mdx

+import { Story, Preview, Props } from '@storybook/addon-docs/blocks';
+import { Tag } from './Tag';
+
+# Tag
+
+Used for displaying metadata, for example to add more details to search results. Background and border colors are generated from the tag name.
+
+<Preview>
+  <div>
+    <Tag name='Tag' onClick={(name) => console.log(name)} />
+  </div>
+</Preview>
+
+### Usage
+
+```jsx
+import { Tag } from '@grafana/ui';
+
+<Tag name='Tag' onClick={(name) => console.log(name)} />
+```
+
+### Props
+<Props of={Tag} />

packages/grafana-ui/src/components/Tags/Tag.story.tsx

+import React from 'react';
+import { action } from '@storybook/addon-actions';
+import { Tag } from './Tag';
+import { withCenteredStory } from '../../utils/storybook/withCenteredStory';
+import mdx from './Tag.mdx';
+
+export default {
+  title: 'General/Tags/Tag',
+  component: Tag,
+  decorators: [withCenteredStory],
+  parameters: {
+    docs: {
+      page: mdx,
+    },
+  },
+};
+
+export const single = () => {
+  return <Tag name="Tag" onClick={action('Tag clicked')} />;
+};

packages/grafana-ui/src/components/Tags/Tag.tsx

+import React, { forwardRef, HTMLAttributes } from 'react';
+import { cx, css } from 'emotion';
+import { GrafanaTheme } from '@grafana/data';
+import { useTheme } from '../../themes';
+import { getTagColorsFromName } from '../../utils';
+
+export interface Props extends Omit<HTMLAttributes<HTMLElement>, 'onClick'> {
+  /** Name of the tag to display */
+  name: string;
+  onClick?: (name: string) => any;
+}
+
+export const Tag = forwardRef<HTMLElement, Props>(({ name, onClick, className, ...rest }, ref) => {
+  const theme = useTheme();
+  const styles = getTagStyles(theme, name);
+
+  const onTagClick = () => {
+    if (onClick) {
+      onClick(name);
+    }
+  };
+
+  return (
+    <span key={name} ref={ref} onClick={onTagClick} className={cx(styles.wrapper, className)} {...rest}>
+      {name}
+    </span>
+  );
+});
+
+const getTagStyles = (theme: GrafanaTheme, name: string) => {
+  const { borderColor, color } = getTagColorsFromName(name);
+  return {
+    wrapper: css`
+      font-weight: ${theme.typography.weight.semibold};
+      font-size: ${theme.typography.size.sm};
+      line-height: ${theme.typography.lineHeight.xs};
+      vertical-align: baseline;
+      background-color: ${color};
+      color: ${theme.colors.white};
+      white-space: nowrap;
+      text-shadow: none;
+      padding: 3px 6px;
+      border: 1px solid ${borderColor};
+      border-radius: ${theme.border.radius.md};
+
+      :hover {
+        opacity: 0.85;
+        cursor: pointer;
+      }
+    `,
+  };
+};

packages/grafana-ui/src/components/Tags/TagList.mdx

+import { Story, Preview, Props } from '@storybook/addon-docs/blocks';
+import { TagList } from './TagList';
+
+# TagList
+
+List of tags with predefined margins and positioning.
+
+<Preview>
+  <TagList tags={['datasource-test', 'gdev', 'mysql', 'mssql']} />
+</Preview>
+
+### Usage
+
+```jsx
+import { TagList } from '@grafana/ui';
+const tags = ['datasource-test', 'gdev', 'mysql', 'mssql'];
+
+<TagList tags={tags} onClick={tag => console.log(tag)} />
+```
+
+### Props
+<Props of={TagList} />

packages/grafana-ui/src/components/Tags/TagList.story.tsx

+import React from 'react';
+import { action } from '@storybook/addon-actions';
+import { TagList } from './TagList';
+import { withCenteredStory } from '../../utils/storybook/withCenteredStory';
+import mdx from './TagList.mdx';
+
+export default {
+  title: 'General/Tags/TagList',
+  component: TagList,
+  decorators: [withCenteredStory],
+  parameters: {
+    docs: {
+      page: mdx,
+    },
+  },
+};
+
+const tags = ['datasource-test', 'gdev', 'mysql', 'mssql'];
+
+export const list = () => {
+  return (
+    <div style={{ width: 300 }}>
+      <TagList tags={tags} onClick={action('Tag clicked')} />
+    </div>
+  );
+};

packages/grafana-ui/src/components/Tags/TagList.tsx

+import React, { FC } from 'react';
+import { cx, css } from 'emotion';
+import { Tag } from './Tag';
+
+export interface Props {
+  tags: string[];
+  onClick?: (name: string) => any;
+  /** Custom styles for the wrapper component */
+  className?: string;
+}
+
+export const TagList: FC<Props> = ({ tags, onClick, className }) => {
+  const styles = getStyles();
+
+  return (
+    <span className={cx(styles.wrapper, className)}>
+      {tags.map(tag => (
+        <Tag key={tag} name={tag} onClick={onClick} className={styles.tag} />
+      ))}
+    </span>
+  );
+};
+
+const getStyles = () => {
+  return {
+    wrapper: css`
+      display: flex;
+      flex: 1 1 auto;
+      flex-wrap: wrap;
+      padding: 10px;
+    `,
+    tag: css`
+      margin-left: 6px;
+      font-size: 11px;
+      padding: 2px 6px;
+    `,
+  };
+};

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

@@ -41,6 +41,8 @@ export { TimeOfDayPicker } from './TimePicker/TimeOfDayPicker';
 export { List } from './List/List';
 export { TagsInput } from './TagsInput/TagsInput';
 export { Pagination } from './Pagination/Pagination';
+export { Tag } from './Tags/Tag';
+export { TagList } from './Tags/TagList';
 
 export { ConfirmModal } from './ConfirmModal/ConfirmModal';
 export { QueryField } from './QueryField/QueryField';