GrafanaUI: InputGroup: Fix invalid children borders (#56169)

* GrafanaUI: InputGroup: Fix invalid children borders

* tidy story

* zindex priority stack

* clarify comment

* fix inputgroup children type

packages/grafana-ui/src/components/QueryEditor/InputGroup.story.internal.tsx

@@ -0,0 +1,65 @@
+import { ComponentMeta } from '@storybook/react';
+import React from 'react';
+
+import { Stack } from '..';
+import { withCenteredStory } from '../../utils/storybook/withCenteredStory';
+import { Input } from '../Input/Input';
+import { Select } from '../Select/Select';
+
+import { AccessoryButton } from './AccessoryButton';
+import { InputGroup } from './InputGroup';
+
+const meta: ComponentMeta<typeof InputGroup> = {
+  title: 'Experimental/InputGroup',
+  component: InputGroup,
+  decorators: [withCenteredStory],
+};
+
+export function WithTextInputs() {
+  return (
+    <InputGroup>
+      <Input placeholder="One" />
+      <Input placeholder="Two" />
+    </InputGroup>
+  );
+}
+
+export function WithAccessoryButton() {
+  return (
+    <InputGroup>
+      <Select value={selectOptions[0]} options={selectOptions} onChange={() => {}} />
+      <AccessoryButton aria-label="Remove group by column" icon="times" variant="secondary" />
+    </InputGroup>
+  );
+}
+
+export function WithSelectsAndInput() {
+  return (
+    <Stack direction="column">
+      <InputGroup>
+        <Input invalid placeholder="LHS" />
+        <Select value={comparitorOptions[0]} options={comparitorOptions} onChange={() => {}} />
+        <Input placeholder="RHS" />
+      </InputGroup>
+      <InputGroup>
+        <Input placeholder="LHS" />
+        <Select invalid value={comparitorOptions[0]} options={comparitorOptions} onChange={() => {}} />
+        <Input placeholder="RHS" />
+      </InputGroup>
+      <InputGroup>
+        <Input placeholder="LHS" />
+        <Select value={comparitorOptions[0]} options={comparitorOptions} onChange={() => {}} />
+        <Input invalid placeholder="RHS" />
+      </InputGroup>
+    </Stack>
+  );
+}
+
+const selectOptions = [{ label: 'Prometheus', value: 1 }];
+const comparitorOptions = [
+  { label: '=', value: 1 },
+  { label: '<', value: 2 },
+  { label: '>', value: 3 },
+];
+
+export default meta;

packages/grafana-ui/src/components/QueryEditor/InputGroup.tsx

@@ -1,16 +1,39 @@
-import { css } from '@emotion/css';
-import React from 'react';
+import { css, cx } from '@emotion/css';
+import React, { Children, cloneElement, isValidElement, ReactElement } from 'react';
 
 import { useStyles2 } from '../../themes';
 
-interface InputGroupProps {}
+type Child = string | undefined | ReactElement<{ className?: string; invalid?: unknown }>;
+interface InputGroupProps {
+  // we type the children props so we can test them later on
+  children: Child | Child[];
+}
 
-export const InputGroup: React.FC<InputGroupProps> = ({ children }) => {
+export const InputGroup = ({ children }: InputGroupProps) => {
   const styles = useStyles2(getStyles);
 
-  return <div className={styles.root}>{children}</div>;
+  // Find children with an invalid prop, and set a class name to raise their z-index so all
+  // of the invalid border is visible
+  const modifiedChildren = Children.map(children, (child) => {
+    if (isValidElement(child) && child.props.invalid) {
+      return cloneElement(child, { className: cx(child.props.className, styles.invalidChild) });
+    }
+
+    return child;
+  });
+
+  return <div className={styles.root}>{modifiedChildren}</div>;
 };
 
+// The later in the array the higher the priority for showing that element's border
+const borderPriority = [
+  '' as const, // lowest priority
+  'base' as const,
+  'hovered' as const,
+  'invalid' as const,
+  'focused' as const, // highest priority
+];
+
 const getStyles = () => ({
   root: css({
     display: 'flex',
@@ -38,14 +61,20 @@ const getStyles = () => ({
 
       //
       position: 'relative',
-      zIndex: 1,
+      zIndex: borderPriority.indexOf('base'),
 
+      // Adjacent borders are overlapping, so raise children up when hovering etc
+      // so all that child's borders are visible.
       '&:hover': {
-        zIndex: 2,
+        zIndex: borderPriority.indexOf('hovered'),
       },
       '&:focus-within': {
-        zIndex: 2,
+        zIndex: borderPriority.indexOf('focused'),
       },
     },
   }),
+
+  invalidChild: css({
+    zIndex: borderPriority.indexOf('invalid'),
+  }),
 });