refactor: fix CR issues

Author: bartoszherba

.eslintrc.js

@@ -32,6 +32,13 @@ module.exports = {
   ],
   rules: {
     "@typescript-eslint/no-floating-promises": "off",
-    "jest/expect-expect": "off"
+    "jest/expect-expect": [
+      "error",
+      {
+        "assertFunctionNames": ["expect", "getByRole", "getByTestId"],
+      }
+    ],
+    "no-plusplus": "off",
   }
 }
+

packages/theme/components/Header/Navigation/HeaderNavigation.vue

@@ -1,29 +1,41 @@
 <template>
   <div
     class="header-navigation"
+    @mouseleave="setCurrentCategory(null)"
   >
     <div class="header-navigation__main">
       <HeaderNavigationItem
         v-for="(category, index) in categoryTree"
         :key="index"
+        ref="lvl0CatRefs"
         :data-testid="category.uid"
-        class="nav-item"
         :label="category.name"
         :link="localePath(getCatLink(category))"
-        @mouseenter.native="setCurrentCategory(category)"
-        @keyup.tab.native="setCurrentCategory(category)"
+        tabindex="0"
+        aria-haspopup="true"
+        class="nav-item"
+        :data-index="index"
+        :has-children="hasChildren(category)"
+        @mouseenter.native.prevent="onMouseEnter(category)"
+        @keydown.down.native.prevent="setCurrentCategory(category)"
+        @keydown.up.native.prevent="setCurrentCategory(null)"
+        @keyup.tab.native.prevent="setFocus($event)"
+        @keydown.right.native.prevent="navRight()"
+        @keydown.left.native.prevent="navLeft()"
+        @keydown.enter.native.prevent="goToCategory(localePath(getCatLink(category)))"
       />
     </div>
     <HeaderNavigationSubcategories
       v-if="hasChildren(currentCategory)"
       :current-category="currentCategory"
-      @hideSubcategories="setCurrentCategory(null)"
+      :has-focus="hasFocus"
+      @hideSubcategories="focusRootElementAndHideSubcategories"
     />
   </div>
 </template>
 <script lang="ts">
 import {
-  defineComponent, PropType, ref,
+  defineComponent, PropType, ref, useRouter,
 } from '@nuxtjs/composition-api';
 import HeaderNavigationItem from './HeaderNavigationItem.vue';
 
@@ -44,19 +56,74 @@ export default defineComponent({
   },
   setup() {
     const { getCatLink } = useUiHelpers();
+    const router = useRouter();
+
     const currentCategory = ref<CategoryTree>(null);
+    const lvl0CatRefs = ref([]);
+    const hasFocus = ref(false);
+    let lvl0CatFocusIdx = 0;
+    let focusedElement = null;
 
     const setCurrentCategory = (category: CategoryTree | null) => {
       currentCategory.value = category;
     };
 
     const hasChildren = (category: CategoryTree) => Boolean(category?.children);
 
+    const setFocus = (event) => {
+      focusedElement = event.target;
+      lvl0CatFocusIdx = Number(event.target.dataset.index);
+      hasFocus.value = true;
+    };
+
+    const focusRootElementAndHideSubcategories = () => {
+      setCurrentCategory(null);
+      if (focusedElement !== null) focusedElement.focus();
+    };
+
+    const navRight = () => {
+      lvl0CatFocusIdx++;
+      if (lvl0CatRefs.value[lvl0CatFocusIdx]) {
+        lvl0CatRefs.value[lvl0CatFocusIdx].$el.focus();
+        focusedElement = lvl0CatRefs.value[lvl0CatFocusIdx].$el;
+      } else {
+        lvl0CatFocusIdx--;
+      }
+    };
+
+    const navLeft = () => {
+      lvl0CatFocusIdx--;
+      if (lvl0CatRefs.value[lvl0CatFocusIdx]) {
+        lvl0CatRefs.value[lvl0CatFocusIdx].$el.focus();
+        focusedElement = lvl0CatRefs.value[lvl0CatFocusIdx].$el;
+      } else {
+        lvl0CatFocusIdx++;
+      }
+    };
+
+    const onMouseEnter = (category: CategoryTree) => {
+      currentCategory.value = category;
+      focusedElement = null;
+      hasFocus.value = false;
+    };
+
+    const goToCategory = (path: string) => {
+      router.push(path);
+    };
+
     return {
       getCatLink,
       setCurrentCategory,
       currentCategory,
       hasChildren,
+      setFocus,
+      focusRootElementAndHideSubcategories,
+      lvl0CatRefs,
+      navRight,
+      navLeft,
+      hasFocus,
+      onMouseEnter,
+      goToCategory,
     };
   },
 });

packages/theme/components/Header/Navigation/HeaderNavigationItem.vue

@@ -1,24 +1,32 @@
 <template>
-  <div class="sf-header-navigation-item">
-    <div class="sf-header-navigation-item__item sf-header-navigation-item__item--desktop">
-      <SfLink
-        class="sf-header-navigation-item__link"
-        :link="link"
-      >
-        {{
-          label
-        }}
-      </SfLink>
-    </div>
+  <div class="sf-header-navigation-item__item sf-header-navigation-item__item--desktop">
+    <SfLink
+      class="sf-header-navigation-item__link"
+      :link="link"
+      tabindex="-1"
+    >
+      {{
+        label
+      }}
+      <SfIcon
+        v-if="hasChildren"
+        icon="chevron_down"
+        size="xxs"
+        color="green-primary"
+        viewBox="0 0 24 24"
+        :coverage="1"
+      />
+    </SfLink>
   </div>
 </template>
 <script lang="ts">
-import { SfLink } from '@storefront-ui/vue';
+import { SfLink, SfIcon } from '@storefront-ui/vue';
 
 export default {
   name: 'HeaderNavigationItem',
   components: {
     SfLink,
+    SfIcon,
   },
   props: {
     label: {
@@ -29,6 +37,19 @@ export default {
       type: [String, Object],
       default: '',
     },
+    hasChildren: {
+      type: Boolean,
+      default: false,
+    },
   },
 };
 </script>
+<style lang="scss">
+.sf-header-navigation-item__link {
+  display: flex;
+  .sf-icon {
+    display: inline-flex;
+    margin: 0 var(--spacer-xs);
+  }
+}
+</style>