Add focus ring to toggle switch

Signed-off-by: Phillip Rak <rak.phillip@gmail.com>

pkg/rancher-components/src/components/Form/ToggleSwitch/ToggleSwitch.vue

@@ -1,5 +1,5 @@
 <script lang="ts">
-import { defineComponent } from 'vue';
+import { defineComponent, onMounted, onBeforeUnmount, useTemplateRef } from 'vue';
 
 type StateType = boolean | 'true' | 'false' | undefined;
 
@@ -33,6 +33,29 @@ export default defineComponent({
 
   emits: ['update:value'],
 
+  setup() {
+    const switchChrome = useTemplateRef<HTMLElement>('switchChrome');
+    const focus = () => {
+      switchChrome.value?.classList.add('focus');
+    };
+
+    const blur = () => {
+      switchChrome.value?.classList.remove('focus');
+    };
+
+    const switchInput = useTemplateRef<HTMLInputElement>('switchInput');
+
+    onMounted(() => {
+      switchInput.value?.addEventListener('focus', focus);
+      switchInput.value?.addEventListener('blur', blur);
+    });
+
+    onBeforeUnmount(() => {
+      switchInput.value?.removeEventListener('focus', focus);
+      switchInput.value?.removeEventListener('blur', blur);
+    });
+  },
+
   data() {
     return { state: false as StateType };
   },
@@ -64,6 +87,7 @@ export default defineComponent({
     >{{ offLabel }}</span>
     <label class="switch hand">
       <input
+        ref="switchInput"
         type="checkbox"
         role="switch"
         :checked="state"
@@ -71,7 +95,10 @@ export default defineComponent({
         @input="toggle(null)"
         @keydown.enter="toggle(null)"
       >
-      <span class="slider round" />
+      <span
+        ref="switchChrome"
+        class="slider round"
+      />
     </label>
     <span
       class="label no-select hand"
@@ -121,6 +148,13 @@ $toggle-height: 16px;
   background-color: var(--checkbox-disabled-bg);
   -webkit-transition: .4s;
   transition: .4s;
+
+  &.focus {
+    @include focus-outline;
+    outline-offset: 2px;
+    -webkit-transition: 0s;
+    transition: 0s;
+  }
 }
 
 .slider:before {