add "scroll to top" button to timelines and notifications

src/components/notifications/notifications.js

@@ -10,10 +10,11 @@ import {
 } from '../../services/notification_utils/notification_utils.js'
 import FaviconService from '../../services/favicon_service/favicon_service.js'
 import { library } from '@fortawesome/fontawesome-svg-core'
-import { faCircleNotch } from '@fortawesome/free-solid-svg-icons'
+import { faCircleNotch, faCircleUp } from '@fortawesome/free-solid-svg-icons'
 
 library.add(
-  faCircleNotch
+  faCircleNotch,
+  faCircleUp
 )
 
 const DEFAULT_SEEN_TO_DISPLAY_COUNT = 30
@@ -34,6 +35,7 @@ const Notifications = {
   },
   data () {
     return {
+      showScrollTop: false,
       bottomedOut: false,
       // How many seen notifications to display in the list. The more there are,
       // the heavier the page becomes. This count is increased when loading
@@ -90,8 +92,16 @@ const Notifications = {
     notificationsToDisplay () {
       return this.filteredNotifications.slice(0, this.unseenCount + this.seenToDisplayCount)
     },
+    noSticky () { return this.$store.getters.mergedConfig.disableStickyHeaders },
     ...mapGetters(['unreadChatCount'])
   },
+  mounted () {
+    this.scrollerRef = this.$refs.root.closest('.column.-scrollable')
+    this.scrollerRef.addEventListener('scroll', this.updateScrollPosition)
+  },
+  unmounted () {
+    this.scrollerRef.removeEventListener('scroll', this.updateScrollPosition)
+  },
   watch: {
     unseenCountTitle (count) {
       if (count > 0) {
@@ -104,6 +114,14 @@ const Notifications = {
     }
   },
   methods: {
+    scrollToTop () {
+      const scrollable = this.scrollerRef
+      scrollable.scrollTo({ top: this.$refs.root.offsetTop })
+      // this.$refs.root.scrollIntoView({ behavior: 'smooth', block: 'start' })
+    },
+    updateScrollPosition () {
+      this.showScrollTop = this.$refs.root.offsetTop < this.scrollerRef.scrollTop
+    },
     markAsSeen () {
       this.$store.dispatch('markNotificationsAsSeen')
       this.seenToDisplayCount = DEFAULT_SEEN_TO_DISPLAY_COUNT

src/components/notifications/notifications.vue

@@ -6,6 +6,7 @@
     <div
       :class="{ minimal: minimalMode }"
       class="Notifications"
+      ref="root"
     >
       <div :class="mainClass">
         <div
@@ -19,12 +20,21 @@
               class="badge badge-notification unseen-count"
             >{{ unseenCount }}</span>
           </div>
+          <button
+            v-if="showScrollTop"
+            class="button-unstyled scroll-to-top-button"
+            type="button"
+            @click="scrollToTop"
+          >
+            <FAIcon icon="circle-up" />
+          </button>
           <button
             v-if="unseenCount"
             class="button-default read-button"
+            type="button"
             @click.prevent="markAsSeen"
           >
-            {{ $t('notifications.read') }}
+        <FAIcon icon="filter" />
           </button>
           <NotificationFilters />
         </div>

src/components/timeline/timeline.js

@@ -29,6 +29,7 @@ const Timeline = {
   ],
   data () {
     return {
+      showScrollTop: false,
       paused: false,
       unfocused: false,
       bottomedOut: false,
@@ -123,6 +124,9 @@ const Timeline = {
     this.$store.commit('setLoading', { timeline: this.timelineName, value: false })
   },
   methods: {
+    scrollToTop () {
+      window.scrollTo({ top: this.$el.offsetTop })
+    },
     stopBlockingClicks: debounce(function () {
       this.blockingClicks = false
     }, 1000),
@@ -222,6 +226,7 @@ const Timeline = {
       }
     },
     handleScroll: throttle(function (e) {
+      this.showScrollTop = this.$el.offsetTop < window.scrollY
       this.determineVisibleStatuses()
       this.scrollLoad(e)
     }, 200),

src/components/timeline/timeline.vue

@@ -2,6 +2,14 @@
   <div :class="['Timeline', classes.root]">
     <div :class="classes.header">
       <TimelineMenu v-if="!embedded" />
+      <button
+        v-if="showScrollTop"
+        class="button-unstyled scroll-to-top-button"
+        type="button"
+        @click="scrollToTop"
+      >
+        <FAIcon icon="circle-up" />
+      </button>
       <button
         v-if="showLoadButton"
         class="button-default loadmore-button"