Get overlay working, refactor

- use arrow function for error watch property, remove let that = this

webapp/components/Upload/index.vue

@@ -1,21 +1,31 @@
 <template>
-  <vue-dropzone
-    id="customdropzone"
-    :key="user.avatar"
-    ref="el"
-    :use-custom-slot="true"
-    :options="dropzoneOptions"
-    @vdropzone-error="verror"
-  >
-    <div class="dz-message">
-      <hc-avatar :user="user" class="profile-avatar" size="x-large"/>
-    </div>
-  </vue-dropzone>
+  <div :key="error">
+    <vue-dropzone
+      id="customdropzone"
+      :key="user.avatar"
+      ref="el"
+      :use-custom-slot="true"
+      :options="dropzoneOptions"
+      @vdropzone-error="verror"
+    >
+      <div class="dz-message" @mouseover="hover = true" @mouseleave="hover = false">
+        <hc-avatar :user="user" class="profile-avatar" size="x-large"></hc-avatar>
+        <div class="hc-attachments-upload-area">
+          <div class="hc-drag-marker">
+            <ds-icon v-if="hover" name="image" size="xxx-large"/>
+          </div>
+        </div>
+      </div>
+      <div class="dz-preview dz-error dz-complete dz-image-preview">
+        <span></span>
+      </div>
+    </vue-dropzone>
+  </div>
 </template>
 <script>
 import vueDropzone from 'nuxt-dropzone'
-import HcAvatar from '~/components/Avatar/Avatar.vue'
 import gql from 'graphql-tag'
+import HcAvatar from '~/components/Avatar/Avatar.vue'
 
 export default {
   components: {
@@ -30,16 +40,15 @@ export default {
       dropzoneOptions: {
         url: this.vddrop,
         maxFilesize: 5.0,
-        dictDefaultMessage: '',
       },
       error: false,
+      hover: false,
     }
   },
   watch: {
-    error() {
-      let that = this
+    error: () => {
       setTimeout(function() {
-        that.error = false
+        this.error = false
       }, 2000)
     },
   },
@@ -76,10 +85,6 @@ export default {
 }
 </script>
 <style lang="scss">
-#customdropzone:hover {
-  cursor: pointer;
-}
-
 #customdropzone .dz-preview {
   transition: all 0.2s ease-out;
   width: 160px;
@@ -104,9 +109,59 @@ export default {
   width: 100%;
 }
 
-#customdropzone .dz-preview .dz-details {
-  color: white;
-  transition: opacity 0.2s linear;
-  text-align: center;
+.hc-attachments-upload-area {
+  position: relative;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  cursor: pointer;
+}
+
+.hc-attachments-upload-button {
+  pointer-events: none;
+}
+
+.hc-drag-marker {
+  position: relative;
+  width: 122px;
+  height: 122px;
+  border-radius: 100%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  color: hsl(0, 0%, 25%);
+  transition: all 0.2s ease-out;
+  font-size: 60px;
+  margin: -120px auto 5px;
+
+  background-color: rgba(255, 255, 255, 0.3);
+  opacity: 0.1;
+
+  &:before {
+    position: absolute;
+    content: '';
+    top: 0;
+    left: 0;
+    bottom: 0;
+    right: 0;
+    border-radius: 100%;
+    border: 20px solid rgba(255, 255, 255, 0.4);
+    visibility: hidden;
+  }
+
+  &:after {
+    position: absolute;
+    content: '';
+    top: 10px;
+    left: 10px;
+    bottom: 10px;
+    right: 10px;
+    border-radius: 100%;
+    border: 1px dashed hsl(0, 0%, 25%);
+  }
+
+  .hc-attachments-upload-area:hover & {
+    opacity: 1;
+  }
 }
 </style>