A11y : Fix option panes not accessible when collapsed (#46405)

* Turned div into text button to make it accessible

* Only icon as button to avoid embedded buttons with overrides delete button

* use icon in Button directly

* Removed unused import

* moving id for labelledBy to h6 elem instead of icon

* Tweaking style, bigger caret

* Fixed aria-expanded

* Modifying and using CollapseToggle from unified alerting

* Added restOfProps to CollapseToggle

public/app/features/alerting/unified/components/CollapseToggle.tsx

@@ -1,43 +1,45 @@
 import React, { FC, HTMLAttributes } from 'react';
 import { css, cx } from '@emotion/css';
-import { IconSize, useStyles, Icon } from '@grafana/ui';
+import { GrafanaTheme2 } from '@grafana/data';
+import { IconSize, useStyles2, Button } from '@grafana/ui';
 
 interface Props extends HTMLAttributes<HTMLButtonElement> {
   isCollapsed: boolean;
   onToggle: (isCollapsed: boolean) => void;
+  // Todo: this should be made compulsory for a11y purposes
+  idControlled?: string;
   size?: IconSize;
   className?: string;
   text?: string;
 }
 
-export const CollapseToggle: FC<Props> = ({ isCollapsed, onToggle, className, text, size = 'xl', ...restOfProps }) => {
-  const styles = useStyles(getStyles);
+export const CollapseToggle: FC<Props> = ({
+  isCollapsed,
+  onToggle,
+  idControlled,
+  className,
+  text,
+  size = 'xl',
+  ...restOfProps
+}) => {
+  const styles = useStyles2(getStyles);
 
   return (
-    <button
-      aria-label={`${isCollapsed ? 'Expand' : 'Collapse'} alert group`}
+    <Button
+      fill="text"
+      aria-expanded={!isCollapsed}
+      aria-controls={idControlled}
       className={cx(styles.expandButton, className)}
+      icon={isCollapsed ? 'angle-right' : 'angle-down'}
       onClick={() => onToggle(!isCollapsed)}
       {...restOfProps}
-    >
-      <Icon size={size} name={isCollapsed ? 'angle-right' : 'angle-down'} />
-      {text}
-    </button>
+    />
   );
 };
 
-export const getStyles = () => ({
+export const getStyles = (theme: GrafanaTheme2) => ({
   expandButton: css`
-    background: none;
-    border: none;
-
-    outline: none !important;
-
-    display: inline-flex;
-    align-items: center;
-
-    svg {
-      margin-bottom: 0;
-    }
+    color: ${theme.colors.text.secondary};
+    margin-right: ${theme.spacing(1)};
   `,
 });

public/app/features/dashboard/components/PanelEditor/OptionsPaneCategory.tsx

@@ -1,11 +1,12 @@
 import React, { FC, ReactNode, useCallback, useEffect, useState, useRef } from 'react';
 import { css, cx } from '@emotion/css';
 import { GrafanaTheme2 } from '@grafana/data';
-import { Counter, Icon, useStyles2 } from '@grafana/ui';
+import { Counter, useStyles2 } from '@grafana/ui';
 import { PANEL_EDITOR_UI_STATE_STORAGE_KEY } from './state/reducers';
 import { useLocalStorage } from 'react-use';
 import { selectors } from '@grafana/e2e-selectors';
 import { useQueryParams } from 'app/core/hooks/useQueryParams';
+import { CollapseToggle } from 'app/features/alerting/unified/components/CollapseToggle';
 
 export interface OptionsPaneCategoryProps {
   id: string;
@@ -101,12 +102,16 @@ export const OptionsPaneCategory: FC<OptionsPaneCategoryProps> = React.memo(
         ref={ref}
       >
         <div className={headerStyles} onClick={onToggle} aria-label={selectors.components.OptionsGroup.toggle(id)}>
-          <div className={cx(styles.toggle, 'editor-options-group-toggle')}>
-            <Icon name={isExpanded ? 'angle-down' : 'angle-right'} />
-          </div>
-          <h6 className={styles.title}>{renderTitle(isExpanded)}</h6>
+          <CollapseToggle isCollapsed={!isExpanded} idControlled={id} onToggle={onToggle} />
+          <h6 id={`button-${id}`} className={styles.title}>
+            {renderTitle(isExpanded)}
+          </h6>
         </div>
-        {isExpanded && <div className={bodyStyles}>{children}</div>}
+        {isExpanded && (
+          <div className={bodyStyles} id={id} aria-labelledby={`button-${id}`}>
+            {children}
+          </div>
+        )}
       </div>
     );
   }
@@ -122,10 +127,6 @@ const getStyles = (theme: GrafanaTheme2) => {
     boxNestedExpanded: css`
       margin-bottom: ${theme.spacing(2)};
     `,
-    toggle: css`
-      color: ${theme.colors.text.secondary};
-      margin-right: ${theme.spacing(1)};
-    `,
     title: css`
       flex-grow: 1;
       overflow: hidden;
@@ -138,7 +139,7 @@ const getStyles = (theme: GrafanaTheme2) => {
       display: flex;
       cursor: pointer;
       align-items: baseline;
-      padding: ${theme.spacing(1)};
+      padding: ${theme.spacing(0.5)};
       color: ${theme.colors.text.primary};
       font-weight: ${theme.typography.fontWeightMedium};