Refactor new_dropdown/index to receive isOpen prop

**Why?**

Previously it managed this as an internal data property, but there
was extra complexity involved because the component doesn't have
all the information it needs (i.e. the `mouseOver` prop).

This is a good opportunity to colocate the data prop with the component
that has the information to change it (i.e. `file_row`) and let
`new_dropdown/index` receive this value as a prop.

app/assets/javascripts/ide/components/file_row_extra.vue

@@ -23,7 +23,7 @@ export default {
       type: Object,
       required: true,
     },
-    mouseOver: {
+    dropdownOpen: {
       type: Boolean,
       required: true,
     },
@@ -92,8 +92,9 @@ export default {
     <new-dropdown
       :type="file.type"
       :path="file.path"
-      :mouse-over="mouseOver"
+      :is-open="dropdownOpen"
       class="prepend-left-8"
+      v-on="$listeners"
     />
   </div>
 </template>

app/assets/javascripts/ide/components/new_dropdown/index.vue

@@ -21,38 +21,29 @@ export default {
       required: false,
       default: '',
     },
-    mouseOver: {
+    isOpen: {
       type: Boolean,
-      required: true,
-    },
+      required: false,
+      default: false,
     },
-  data() {
-    return {
-      dropdownOpen: false,
-    };
   },
   watch: {
-    dropdownOpen() {
+    isOpen() {
       this.$nextTick(() => {
         this.$refs.dropdownMenu.scrollIntoView({
           block: 'nearest',
         });
       });
     },
-    mouseOver() {
-      if (!this.mouseOver) {
-        this.dropdownOpen = false;
-      }
-    },
   },
   methods: {
     ...mapActions(['createTempEntry', 'openNewEntryModal', 'deleteEntry']),
     createNewItem(type) {
       this.openNewEntryModal({ type, path: this.path });
-      this.dropdownOpen = false;
+      this.$emit('toggle', false);
     },
     openDropdown() {
-      this.dropdownOpen = !this.dropdownOpen;
+      this.$emit('toggle', !this.isOpen);
     },
   },
   modalTypes,
@@ -63,7 +54,7 @@ export default {
   <div class="ide-new-btn">
     <div
       :class="{
-        show: dropdownOpen,
+        show: isOpen,
       }"
       class="dropdown d-flex"
     >

app/assets/javascripts/vue_shared/components/file_row.vue

@@ -39,7 +39,7 @@ export default {
   },
   data() {
     return {
-      mouseOver: false,
+      dropdownOpen: false,
     };
   },
   computed: {
@@ -123,8 +123,8 @@ export default {
 
       return this.$router.currentRoute.path === `/project${this.file.url}`;
     },
-    toggleHover(over) {
-      this.mouseOver = over;
+    toggleDropdown(val) {
+      this.dropdownOpen = val;
     },
   },
 };
@@ -140,8 +140,7 @@ export default {
       class="file-row"
       role="button"
       @click="clickFile"
-      @mouseover="toggleHover(true)"
-      @mouseleave="toggleHover(false)"
+      @mouseleave="toggleDropdown(false)"
     >
       <div class="file-row-name-container">
         <span ref="textOutput" :style="levelIndentation" class="file-row-name str-truncated">
@@ -160,7 +159,8 @@ export default {
           :is="extraComponent"
           v-if="extraComponent && !(hideExtraOnTree && file.type === 'tree')"
           :file="file"
-          :mouse-over="mouseOver"
+          :dropdown-open="dropdownOpen"
+          @toggle="toggleDropdown($event)"
         />
       </div>
     </div>

spec/javascripts/ide/components/file_row_extra_spec.js

@@ -20,7 +20,7 @@ describe('IDE extra file row component', () => {
       file: {
         ...file('test'),
       },
-      mouseOver: false,
+      dropdownOpen: false,
     });
 
     spyOnProperty(vm, 'getUnstagedFilesCountForPath').and.returnValue(() => unstagedFilesCount);

spec/javascripts/ide/components/new_dropdown/index_spec.js

@@ -56,11 +56,11 @@ describe('new dropdown component', () => {
     });
   });
 
-  describe('dropdownOpen', () => {
+  describe('isOpen', () => {
     it('scrolls dropdown into view', done => {
       spyOn(vm.$refs.dropdownMenu, 'scrollIntoView');
 
-      vm.dropdownOpen = true;
+      vm.isOpen = true;
 
       setTimeout(() => {
         expect(vm.$refs.dropdownMenu.scrollIntoView).toHaveBeenCalledWith({

spec/javascripts/vue_shared/components/file_row_spec.js

 import Vue from 'vue';
 import FileRow from '~/vue_shared/components/file_row.vue';
+import FileRowExtra from '~/ide/components/file_row_extra.vue';
 import { file } from 'spec/ide/helpers';
 import mountComponent from '../../helpers/vue_mount_component_helper';
 
@@ -16,6 +17,10 @@ describe('File row component', () => {
     vm.$destroy();
   });
 
+  const findNewDropdown = () => vm.$el.querySelector('.ide-new-btn .dropdown');
+  const findNewDropdownButton = () => vm.$el.querySelector('.ide-new-btn .dropdown button');
+  const findFileRow = () => vm.$el.querySelector('.file-row');
+
   it('renders name', () => {
     createComponent({
       file: file('t4'),
@@ -84,4 +89,59 @@ describe('File row component', () => {
 
     expect(vm.$el.querySelector('.js-file-row-header')).not.toBe(null);
   });
+
+  describe('new dropdown', () => {
+    beforeEach(() => {
+      createComponent({
+        file: file('t5'),
+        level: 1,
+        extraComponent: FileRowExtra,
+      });
+    });
+
+    it('renders in extra component', () => {
+      expect(findNewDropdown()).not.toBe(null);
+    });
+
+    it('is hidden at start', () => {
+      expect(findNewDropdown()).not.toHaveClass('show');
+    });
+
+    it('is opened when button is clicked', done => {
+      expect(vm.dropdownOpen).toBe(false);
+      findNewDropdownButton().dispatchEvent(new Event('click'));
+
+      vm.$nextTick()
+        .then(() => {
+          expect(vm.dropdownOpen).toBe(true);
+          expect(findNewDropdown()).toHaveClass('show');
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+
+    describe('when opened', () => {
+      beforeEach(() => {
+        vm.dropdownOpen = true;
+      });
+
+      it('stays open when button triggers mouseout', () => {
+        findNewDropdownButton().dispatchEvent(new Event('mouseout'));
+
+        expect(vm.dropdownOpen).toBe(true);
+      });
+
+      it('stays open when button triggers mouseleave', () => {
+        findNewDropdownButton().dispatchEvent(new Event('mouseleave'));
+
+        expect(vm.dropdownOpen).toBe(true);
+      });
+
+      it('closes when row triggers mouseleave', () => {
+        findFileRow().dispatchEvent(new Event('mouseleave'));
+
+        expect(vm.dropdownOpen).toBe(false);
+      });
+    });
+  });
 });