Add alignment options to Menu component

components/src/stories/Menu.stories.js

@@ -10,16 +10,22 @@ export const Component = {
     setup() {
       return {args};
     },
-    template: `<ui-menu>
-    <ui-button 
-      slot="trigger" 
-      text="open menu" 
-    />
-    <div style="padding:8px 16px; width:300px; border:1px solid black;" slot="content">
-      <p>item</p>
-    </div>
-  </ui-menu>`
+    template: `
+      <ui-menu v-bind="args">
+        <ui-button 
+          slot="trigger" 
+          text="open menu" 
+        />
+        <div style="padding:8px 16px; width:300px; border:1px solid black;" slot="content">
+          <p>item</p>
+        </div>
+      </ui-menu>
+    `
   }),
+
+  args: {
+    align: 'left',
+  },
 };
 
 export default {
@@ -28,4 +34,13 @@ export default {
   parameters: {
     layout: 'centered',
   },
-};
+
+  argTypes: {
+    align: {
+      options: ['right', 'left'],
+      control: {
+        type: 'select',
+      },
+    },
+  },
+};

components/src/widgets/menu/widget.spec.js

@@ -48,25 +48,70 @@ describe('Menu component', () => {
   describe('onMounted', () => {
     it('adds up event listener on component mount', () => {
       const addEventListenerSpy = jest.spyOn(document, 'addEventListener');
-  
+
       mount(Menu);
 
       expect(addEventListenerSpy).toHaveBeenCalledWith('click', expect.any(Function));
-  
+
       addEventListenerSpy.mockRestore();
     });
   });
 
   describe('onUnmounted', () => {
     it('cleans up event listener on component unmount', async () => {
       const removeEventListenerSpy = jest.spyOn(document, 'removeEventListener');
-  
+
       const wrapper = mount(Menu);
       await wrapper.unmount();
-  
+
       expect(removeEventListenerSpy).toHaveBeenCalledWith('click', expect.any(Function));
-  
+
       removeEventListenerSpy.mockRestore();
     });
-  })
+  });
+
+  describe('alignment class', () => {
+    it('sets the "menu-content_align-right" class if align=right', async () => {
+      const wrapper = mount(Menu, {
+        props: {
+          align: 'right',
+        },
+      });
+
+      // Open menu
+      await wrapper.find('.menu-trigger').trigger('click');
+
+      expect(wrapper.find('.menu-content_align-right').exists()).toEqual(true);
+    });
+
+    it('sets the "menu-content_align-left" class if align=left', async () => {
+      const wrapper = mount(Menu, {
+        props: {
+          align: 'left',
+        },
+      });
+
+      // Open menu
+      await wrapper.find('.menu-trigger').trigger('click');
+
+      expect(wrapper.find('.menu-content_align-left').exists()).toEqual(true);
+    });
+  });
+
+  describe('align prop validator', () => {
+    it.each([
+      // expected, value
+      [true, 'left'],
+      [true, 'right'],
+      [false, 'center'],
+      [false, 'foo'],
+    ])(
+      'returns %s if the prop value is %s',
+      (expected, value) => {
+        const result = Menu.props.align.validator(value);
+
+        expect(result).toEqual(expected);
+      },
+    );
+  });
 });

components/src/widgets/menu/widget.vue

@@ -3,17 +3,18 @@
     ref="menu"
     class="menu"
   >
-    <div 
-      class="menu-trigger" 
+    <div
+      class="menu-trigger"
       @click.stop="toggle"
     >
       <slot name="trigger" />
     </div>
-    
+
     <div class="menu-content-wrapper">
-      <div 
+      <div
         v-if="showMenu"
         class="menu-content"
+        :class="alignmentClass"
         @click.stop
       >
         <slot name="content" />
@@ -23,39 +24,59 @@
 </template>
 
 <script setup>
-  import { onMounted, onUnmounted, ref } from 'vue'
+import { onMounted, onUnmounted, ref, computed } from 'vue'
 
-  const showMenu = ref(false)
-  const menu = ref(null)
+const props = defineProps({
+  align: {
+    type: String,
+    default: 'left',
+    validator(value) {
+      return ['left', 'right'].includes(value);
+    },
+  },
+});
 
-  const toggle = () => {
-    showMenu.value = !showMenu.value;
-  }
+const showMenu = ref(false);
+const menu = ref(null);
+
+const alignmentClass = computed(() => (props.align === 'left'
+  ? 'menu-content_align-left'
+  : 'menu-content_align-right'
+));
 
-  const handleClickOutside = (event) => {
-    if (menu.value && !menu.value.contains(event.target)) {
-      showMenu.value = false;
-    }
+const toggle = () => {
+  showMenu.value = !showMenu.value;
+};
+
+const handleClickOutside = (event) => {
+  if (menu.value && !menu.value.contains(event.target)) {
+    showMenu.value = false;
   }
+};
 
-  onMounted(() => {
-    document.addEventListener("click", handleClickOutside)
-  })
+onMounted(() => {
+  document.addEventListener("click", handleClickOutside);
+});
 
-  onUnmounted(() => {
-    document.removeEventListener("click", handleClickOutside)
-  })
+onUnmounted(() => {
+  document.removeEventListener("click", handleClickOutside);
+});
 </script>
 
 <style lang="stylus" scoped>
+.menu-content-wrapper {
+  position: relative;
+}
 
-  .menu-content-wrapper {
-    position: relative;
-  }
+.menu-content {
+  position: absolute;
+  top: 0;
 
-  .menu-content {
-    position: absolute;
-    top: 0;
+  &_align-right {
+    right: 0;
+  }
+  &_align-left {
     left: 0;
   }
-</style>
+}
+</style>