From 314a4474f6475435cfac7e5e02862015a9455660 Mon Sep 17 00:00:00 2001
From: tusooa <tusooa@kazv.moe>
Date: Mon, 2 Jan 2023 12:40:03 -0500
Subject: [PATCH] Fix header indicator

---
 src/components/emoji_picker/emoji_picker.js  | 28 +++++++++++++++++---
 src/components/emoji_picker/emoji_picker.vue |  2 ++
 2 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/src/components/emoji_picker/emoji_picker.js b/src/components/emoji_picker/emoji_picker.js
index c87dea7e21..9c97e16ccd 100644
--- a/src/components/emoji_picker/emoji_picker.js
+++ b/src/components/emoji_picker/emoji_picker.js
@@ -81,6 +81,13 @@ const filterByKeyword = (list, keyword = '', languages, nameLocalizer) => {
   return orderedEmojiList.flat()
 }
 
+const getOffset = (elem) => {
+  const style = elem.style.transform
+  const res = /translateY\((\d+)px\)/.exec(style)
+  if (!res) { return 0 }
+  return res[1]
+}
+
 const EmojiPicker = {
   props: {
     enableStickerPicker: {
@@ -144,12 +151,25 @@ const EmojiPicker = {
       this.$emit('emoji', { insertion: value, keepOpen: this.keepOpen })
     },
     onScroll (startIndex, endIndex, visibleStartIndex, visibleEndIndex) {
+      console.log('onScroll', startIndex, endIndex, visibleStartIndex, visibleEndIndex)
       const current = this.filteredEmojiGroups[visibleStartIndex].id
-      this.scrolledGroup(current)
+      const target = this.$refs['emoji-groups'].$el
+      this.scrolledGroup(target, current, visibleStartIndex, visibleEndIndex)
     },
-    scrolledGroup (groupId) {
-      this.activeGroup = groupId
-      this.scrollHeader()
+    scrolledGroup (target, groupId, start, end) {
+      const top = target.scrollTop + 5
+      this.$nextTick(() => {
+        this.filteredEmojiGroups.slice(start, end + 1).forEach(group => {
+          const ref = this.groupRefs['group-' + group.id]
+          if (!ref) { return }
+          const elem = ref.$el.parentElement
+          if (!elem) { return }
+          if (elem && getOffset(elem) <= top) {
+            this.activeGroup = group.id
+          }
+        })
+        this.scrollHeader()
+      })
     },
     scrollHeader () {
       // Scroll the active tab's header into view
diff --git a/src/components/emoji_picker/emoji_picker.vue b/src/components/emoji_picker/emoji_picker.vue
index 15cdb7041f..78da48083e 100644
--- a/src/components/emoji_picker/emoji_picker.vue
+++ b/src/components/emoji_picker/emoji_picker.vue
@@ -80,10 +80,12 @@
             :class="groupsScrolledClass"
             :min-item-size="minItemSize"
             :items="filteredEmojiGroups"
+            :emit-update="true"
             @update="onScroll"
           >
             <template #default="{ item: group, index, active }">
               <DynamicScrollerItem
+                :ref="setGroupRef('group-' + group.id)"
                 :item="group"
                 :active="active"
                 :data-index="index"