Use virtual scrolling for emoji picker

package.json

@@ -45,6 +45,7 @@
     "vue-i18n": "9.2.2",
     "vue-router": "4.1.6",
     "vue-template-compiler": "2.7.14",
+    "vue-virtual-scroller": "^2.0.0-beta.7",
     "vuex": "4.1.0"
   },
   "devDependencies": {

src/boot/after_store.js

@@ -1,6 +1,8 @@
 import { createApp } from 'vue'
 import { createRouter, createWebHistory } from 'vue-router'
 import vClickOutside from 'click-outside-vue3'
+import VueVirtualScroller from 'vue-virtual-scroller'
+import 'vue-virtual-scroller/dist/vue-virtual-scroller.css'
 
 import { FontAwesomeIcon, FontAwesomeLayers } from '@fortawesome/vue-fontawesome'
 
@@ -397,6 +399,7 @@ const afterStoreSetup = async ({ store, i18n }) => {
 
   app.use(vClickOutside)
   app.use(VBodyScrollLock)
+  app.use(VueVirtualScroller)
 
   app.component('FAIcon', FontAwesomeIcon)
   app.component('FALayers', FontAwesomeLayers)

src/components/emoji_picker/emoji_picker.js

@@ -143,22 +143,13 @@ const EmojiPicker = {
       }
       this.$emit('emoji', { insertion: value, keepOpen: this.keepOpen })
     },
-    onScroll (e) {
-      const target = (e && e.target) || this.$refs['emoji-groups']
-      this.updateScrolledClass(target)
-      this.scrolledGroup(target)
+    onScroll (startIndex, endIndex, visibleStartIndex, visibleEndIndex) {
+      const current = this.filteredEmojiGroups[visibleStartIndex].id
+      this.scrolledGroup(current)
     },
-    scrolledGroup (target) {
-      const top = target.scrollTop + 5
-      this.$nextTick(() => {
-        this.allEmojiGroups.forEach(group => {
-          const ref = this.groupRefs['group-' + group.id]
-          if (ref && ref.offsetTop <= top) {
-            this.activeGroup = group.id
-          }
-        })
-        this.scrollHeader()
-      })
+    scrolledGroup (groupId) {
+      this.activeGroup = groupId
+      this.scrollHeader()
     },
     scrollHeader () {
       // Scroll the active tab's header into view
@@ -177,14 +168,9 @@ const EmojiPicker = {
         setScroll(right + margin - headerCont.clientWidth)
       }
     },
-    highlight (key) {
-      const ref = this.groupRefs['group-' + key]
-      const top = ref.offsetTop
+    highlight (index) {
       this.setShowStickers(false)
-      this.activeGroup = key
-      this.$nextTick(() => {
-        this.$refs['emoji-groups'].scrollTop = top + 1
-      })
+      this.$refs['emoji-groups'].scrollToItem(index)
     },
     updateScrolledClass (target) {
       if (target.scrollTop <= 5) {
@@ -238,6 +224,9 @@ const EmojiPicker = {
     }
   },
   computed: {
+    minItemSize () {
+      return 32
+    },
     activeGroupView () {
       return this.showingStickers ? '' : this.activeGroup
     },

src/components/emoji_picker/emoji_picker.scss

@@ -74,6 +74,7 @@ $emoji-picker-emoji-size: 32px;
   }
 
   .emoji-groups {
+    height: 100%;
     min-height: 200px;
   }
 

src/components/emoji_picker/emoji_picker.vue

@@ -13,7 +13,7 @@
           class="emoji-tabs"
         >
           <span
-            v-for="group in filteredEmojiGroups"
+            v-for="(group, index) in filteredEmojiGroups"
             :ref="setGroupRef('group-header-' + group.id)"
             :key="group.id"
             class="emoji-tabs-item"
@@ -21,7 +21,7 @@
               active: activeGroupView === group.id
             }"
             :title="group.text"
-            @click.prevent="highlight(group.id)"
+            @click.prevent="highlight(index)"
           >
             <span
               v-if="group.image"
@@ -74,45 +74,52 @@
               @input="$event.target.composing = false"
             >
           </div>
-          <div
+          <DynamicScroller
             ref="emoji-groups"
             class="emoji-groups"
             :class="groupsScrolledClass"
-            @scroll="onScroll"
+            :min-item-size="minItemSize"
+            :items="filteredEmojiGroups"
+            @update="onScroll"
           >
-            <div
-              v-for="group in filteredEmojiGroups"
-              :key="group.id"
-              class="emoji-group"
-            >
-              <h6
-                :ref="setGroupRef('group-' + group.id)"
-                class="emoji-group-title"
-              >
-                {{ group.text }}
-              </h6>
-              <span
-                v-for="emoji in group.emojis"
-                :key="group.id + emoji.displayText"
-                :title="maybeLocalizedEmojiName(emoji)"
-                class="emoji-item"
-                @click.stop.prevent="onEmoji(emoji)"
+            <template #default="{ item: group, index, active }">
+              <DynamicScrollerItem
+                :item="group"
+                :active="active"
+                :data-index="index"
+                :size-dependencies="[group.emojis.length]"
               >
-                <span
-                  v-if="!emoji.imageUrl"
-                  class="emoji-picker-emoji -unicode"
-                >{{ emoji.replacement }}</span>
-                <still-image
-                  v-else
-                  class="emoji-picker-emoji -custom"
-                  loading="lazy"
-                  :src="emoji.imageUrl"
-                  :data-emoji-name="group.id + emoji.displayText"
-                />
-              </span>
-              <span :ref="setGroupRef('group-end-' + group.id)" />
-            </div>
-          </div>
+                <div
+                  class="emoji-group"
+                >
+                  <h6
+                    class="emoji-group-title"
+                  >
+                    {{ group.text }}
+                  </h6>
+                  <span
+                    v-for="emoji in group.emojis"
+                    :key="group.id + emoji.displayText"
+                    :title="maybeLocalizedEmojiName(emoji)"
+                    class="emoji-item"
+                    @click.stop.prevent="onEmoji(emoji)"
+                  >
+                    <span
+                      v-if="!emoji.imageUrl"
+                      class="emoji-picker-emoji -unicode"
+                    >{{ emoji.replacement }}</span>
+                    <still-image
+                      v-else
+                      class="emoji-picker-emoji -custom"
+                      loading="lazy"
+                      :src="emoji.imageUrl"
+                      :data-emoji-name="group.id + emoji.displayText"
+                    />
+                  </span>
+                </div>
+              </DynamicScrollerItem>
+            </template>
+          </DynamicScroller>
           <div class="keep-open">
             <Checkbox v-model="keepOpen">
               {{ $t('emoji.keep_open') }}

yarn.lock

@@ -6370,6 +6370,11 @@ minimist@^1.2.5:
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.5.tgz#67d66014b66a6a8aaa0c083c5fd58df4e4e97602"
   integrity sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==
 
+mitt@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/mitt/-/mitt-2.1.0.tgz#f740577c23176c6205b121b2973514eade1b2230"
+  integrity sha512-ILj2TpLiysu2wkBbWjAmww7TkZb65aiQO+DkVdUTBpBXq+MHYiETENkKFMtsJZX1Lf4pe4QOrTSjIfUwN5lRdg==
+
 mkdirp@^0.5.1:
   version "0.5.1"
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
@@ -8805,6 +8810,16 @@ vue-loader@17.0.1:
     hash-sum "^2.0.0"
     loader-utils "^2.0.0"
 
+vue-observe-visibility@^2.0.0-alpha.1:
+  version "2.0.0-alpha.1"
+  resolved "https://registry.yarnpkg.com/vue-observe-visibility/-/vue-observe-visibility-2.0.0-alpha.1.tgz#1e4eda7b12562161d58984b7e0dea676d83bdb13"
+  integrity sha512-flFbp/gs9pZniXR6fans8smv1kDScJ8RS7rEpMjhVabiKeq7Qz3D9+eGsypncjfIyyU84saU88XZ0zjbD6Gq/g==
+
+vue-resize@^2.0.0-alpha.1:
+  version "2.0.0-alpha.1"
+  resolved "https://registry.yarnpkg.com/vue-resize/-/vue-resize-2.0.0-alpha.1.tgz#43eeb79e74febe932b9b20c5c57e0ebc14e2df3a"
+  integrity sha512-7+iqOueLU7uc9NrMfrzbG8hwMqchfVfSzpVlCMeJQe4pyibqyoifDNbKTZvwxZKDvGkB+PdFeKvnGZMoEb8esg==
+
 vue-router@4.1.6:
   version "4.1.6"
   resolved "https://registry.yarnpkg.com/vue-router/-/vue-router-4.1.6.tgz#b70303737e12b4814578d21d68d21618469375a1"
@@ -8828,6 +8843,15 @@ vue-template-compiler@2.7.14:
     de-indent "^1.0.2"
     he "^1.2.0"
 
+vue-virtual-scroller@^2.0.0-beta.7:
+  version "2.0.0-beta.7"
+  resolved "https://registry.yarnpkg.com/vue-virtual-scroller/-/vue-virtual-scroller-2.0.0-beta.7.tgz#4ea8158638c84b2033b001a8b26c5fcb6896b271"
+  integrity sha512-OrouVj1i2939jaLjVfu8f5fsDlbzhAb4bOsYZYrAkpcVLylAmMoGtIL7eT3hJrdTiaKbwQpRdnv7DKf9Fn+tHg==
+  dependencies:
+    mitt "^2.1.0"
+    vue-observe-visibility "^2.0.0-alpha.1"
+    vue-resize "^2.0.0-alpha.1"
+
 vue@3.2.45:
   version "3.2.45"
   resolved "https://registry.yarnpkg.com/vue/-/vue-3.2.45.tgz#94a116784447eb7dbd892167784619fef379b3c8"