fix(a11y): multiple a11y fixes

- SR & Live Region
	- add new componet to handle SR annoucements with delay, as focus imput interrupts the annoucements
	- screen reader announcement no longer announces individual emojis, but rather the count of emojis found OR no emoji found message if none are found
	- add aria-atomic for the aria-live region to ensure the SR reads the whole message

- Navigation
	- disabled top navigation buttons while search input is focused

- Search
	- changed the outer div to a form with role search to improve semantics
	- add aria-hidden on the loupe icon in the search bar
	- add aria-label to the search input

- Search Result & Default Categories
	- render no result message in the preview section, when preview section is not rendered. previously the no result was only shown in the preview, but since the picker already supports hiding it, we don't want to loose the visual cue of "no emojis found"
	- add aria-label to the outer div around the all the moji categories
	- add aria-labelledby for each group of emojis pointing to the section header, and add role = group

packages/emoji-mart-data/i18n/en.json

@@ -2,6 +2,10 @@
   "search": "Search",
   "search_no_results_1": "Oh no!",
   "search_no_results_2": "That emoji couldn’t be found",
+  "emojis_found_plural": "emojis found",
+  "emoji_found_singular": "emoji found",
+  "search_input_aria_label": "Search emojis",
+  "available_emojis": "Available emojis",
   "pick": "Pick an emoji…",
   "add_custom": "Add custom emoji",
   "categories": {

packages/emoji-mart/src/components/Navigation/Navigation.tsx

@@ -111,6 +111,7 @@ export default class Navigation extends PureComponent {
                 type="button"
                 class="flex flex-grow flex-center"
                 role="tab"
+                disabled={this.props.disabled}
                 tabIndex={selected ? 0 : -1}
                 onMouseDown={(e) => e.preventDefault()}
                 onClick={() => {

packages/emoji-mart/src/components/Picker/Picker.tsx

@@ -10,6 +10,7 @@ import type { Category } from '@slidoapp/emoji-mart-data'
 import { Emoji } from '../Emoji'
 import { PureInlineComponent } from '../HOCs'
 import { Navigation } from '../Navigation'
+import ScreenReaderAnnouncement from '../ScreenReaderAnnouncement'
 
 const Performance = {
   rowsPerRender: 10,
@@ -707,6 +708,7 @@ export default class Picker extends Component {
         theme={this.state.theme}
         dir={this.dir}
         unfocused={!!this.state.searchResults}
+        disabled={!!this.state.searchResults}
         position={this.props.navPosition}
         onClick={this.handleCategoryClick}
       />
@@ -856,6 +858,20 @@ export default class Picker extends Component {
     )
   }
 
+  getResultMessage() {
+    const { searchResults } = this.state
+    if (searchResults === undefined || searchResults === null) return ''
+
+    if (searchResults.length <= 0) {
+      return I18n.search_no_results_2
+    } else {
+      let count = searchResults.flat().length
+      let translation =
+        count === 1 ? I18n.emoji_found_singular : I18n.emojis_found_plural
+      return [count, translation].join(' ')
+    }
+  }
+
   renderSearch() {
     const renderSkinTone =
       this.props.previewPosition == 'none' ||
@@ -865,17 +881,20 @@ export default class Picker extends Component {
       <div>
         <div class="spacer"></div>
         <div class="flex flex-middle">
-          <div class="search relative flex-grow">
+          <div class="search relative flex-grow" role="presentation">
             <input
               type="search"
               ref={this.refs.searchInput}
               placeholder={I18n.search}
               onClick={this.handleSearchClick}
               onInput={this.handleSearchInput}
               onKeyDown={this.handleEmojisKeyDown}
-              autoComplete="off"
-            ></input>
-            <span class="icon loupe flex">{Icons.search.loupe}</span>
+              aria-label={I18n.search_input_aria_label}
+              autocomplete="off"
+            />
+            <span aria-hidden="true" class="icon loupe flex">
+              {Icons.search.loupe}
+            </span>
             {this.state.searchResults && (
               <button
                 title="Clear"
@@ -889,7 +908,6 @@ export default class Picker extends Component {
               </button>
             )}
           </div>
-
           {renderSkinTone && this.renderSkinToneButton()}
         </div>
       </div>
@@ -913,6 +931,11 @@ export default class Picker extends Component {
         <div>
           {!searchResults.length ? (
             <div class={`padding-small align-${this.dir[0]}`}>
+              {this.props.previewPosition === 'none' && (
+                <p>
+                  {I18n.search_no_results_1} {I18n.search_no_results_2}
+                </p>
+              )}
               {this.props.onAddCustomEmoji && (
                 <a onClick={this.props.onAddCustomEmoji}>{I18n.add_custom}</a>
               )}
@@ -951,6 +974,7 @@ export default class Picker extends Component {
         }}
         role="listbox"
         onKeyDown={this.handleEmojisKeyDown}
+        aria-label={I18n.available_emojis}
       >
         {categories.map((category) => {
           const { root, rows } = this.refs.categories.get(category.id)
@@ -960,12 +984,15 @@ export default class Picker extends Component {
             <div
               data-id={category.target ? category.target.id : category.id}
               class="category"
+              role="group"
+              aria-labelledby={`${category.id}-heading`}
               ref={root}
             >
               <div
                 aria-label={categoryName + ' emojis'}
                 aria-level="5"
                 role="heading"
+                id={`${category.id}-heading`}
                 class={`sticky padding-small align-${this.dir[0]}`}
               >
                 {categoryName}
@@ -1067,20 +1094,15 @@ export default class Picker extends Component {
     )
   }
 
+  // This is a hidden live region that announces the number of emojis found only
   renderLiveRegion() {
-    const emoji = this.getEmojiByPos(this.state.pos)
-    const noSearchResults =
-      this.state.searchResults == null || this.state.searchResults.length === 0
-
-    const contents = emoji
-      ? emoji.name
-      : noSearchResults
-      ? I18n.search_no_results_2
-      : ''
-
     return (
-      <div aria-live="polite" class="sr-only">
-        {contents}
+      <div
+        aria-live="polite"
+        class="sr-only"
+        aria-atomic="true"
+      >
+        {this.getResultMessage()}
       </div>
     )
   }
@@ -1166,8 +1188,9 @@ export default class Picker extends Component {
     const lineWidth = this.props.perLine * this.props.emojiButtonSize
 
     return (
-      <section
+      <form
         id="root"
+        role="search"
         class="flex flex-column"
         dir={this.dir}
         style={{
@@ -1191,7 +1214,7 @@ export default class Picker extends Component {
               width: this.props.dynamicWidth ? '100%' : lineWidth,
               height: '100%',
             }}
-            aria-label={I18n.a11y?.available_emojis ?? 'Available emojis'}
+            role="presentation"
           >
             {this.props.searchPosition == 'static' && this.renderSearch()}
             {this.renderSearchResults()}
@@ -1202,8 +1225,12 @@ export default class Picker extends Component {
         {this.props.navPosition == 'bottom' && this.renderNav()}
         {this.props.previewPosition == 'bottom' && this.renderPreview()}
         {this.state.showSkins && this.renderSkins()}
-        {this.renderLiveRegion()}
-      </section>
+        <ScreenReaderAnnouncement
+          level="polite"
+          identity="emoji-picker"
+          text={this.getResultMessage()}
+        />
+      </form>
     )
   }
 }

packages/emoji-mart/src/components/Picker/PickerStyles.scss

@@ -127,12 +127,15 @@
 }
 
 .sr-only {
-  position: absolute;
-  left: -10000px;
-  top: auto;
-  width: 1px;
+  border: 0;
+  clip: rect(0, 0, 0, 0);
   height: 1px;
+  margin: -1px;
   overflow: hidden;
+  padding: 0;
+  position: absolute;
+  white-space: nowrap;
+  width: 1px;
 }
 
 a {
@@ -293,6 +296,11 @@ button {
     &:hover { color: var(--color-a) }
   }
 
+  button:disabled {
+    color: var(--color-c);
+    cursor: not-allowed;
+  }
+
   svg, img {
     width: var(--category-icon-size);
     height: var(--category-icon-size);

packages/emoji-mart/src/components/ScreenReaderAnnouncement/index.tsx

@@ -0,0 +1,44 @@
+import { useEffect, useState } from 'preact/hooks'
+
+type Level = 'assertive' | 'polite'
+
+type AnnouncementProps = {
+  text: string
+  level: Level
+  delay: number
+  timeout: number
+}
+
+/**
+ * Component which will cause a screen reader to announce a message when required.
+ */
+const ScreenReaderAnnouncement = ({
+  delay = 1500,
+  level,
+  text,
+  timeout = 2000,
+}: AnnouncementProps) => {
+  const [message, setMessage] = useState('')
+
+  useEffect(() => {
+    let timer = setTimeout(() => {
+      setMessage(text)
+
+      timer = setTimeout(() => {
+        setMessage('')
+      }, timeout)
+    }, delay)
+
+    return () => {
+      clearTimeout(timer)
+    }
+  }, [delay, text, timeout])
+
+  return (
+    <div aria-live={level} className="sr-only" aria-atomic="true">
+      {message}
+    </div>
+  )
+}
+
+export default ScreenReaderAnnouncement