Lazy-load emoji picker in post form

When clicking the reply button, we used to load the whole emoji picker.
This causes a considerable delay even if the user is not going to use
the emoji picker. Now the content of the emoji picker is loaded only
after the user has explicitly opened the emoji picker.

Ref: grouped-emoji-picker

1 files changed, 19 insertions, 5 deletions

diff --git a/src/components/emoji_picker/emoji_picker.js b/src/components/emoji_picker/emoji_picker.js
index 5b90c31e..8b4f302f 100644
--- a/src/components/emoji_picker/emoji_picker.js
+++ b/src/components/emoji_picker/emoji_picker.js
@@ -39,6 +39,10 @@ const EmojiPicker = {
       required: false,
       type: Boolean,
       default: false
+    },
+    showing: {
+      required: true,
+      type: Boolean
     }
   },
   data () {
@@ -48,7 +52,9 @@ const EmojiPicker = {
       showingStickers: false,
       groupsScrolledClass: 'scrolled-top',
       keepOpen: false,
-      customEmojiTimeout: null
+      customEmojiTimeout: null,
+      // Lazy-load only after the first time `showing` becomes true.
+      contentLoaded: false
     }
   },
   components: {
@@ -115,6 +121,9 @@ const EmojiPicker = {
       this.$lozad = lozad('img', {})
       this.$lozad.observe()
     },
+    waitForDomAndInitializeLazyLoad() {
+      this.$nextTick(() => this.initializeLazyLoad())
+    },
     destroyLazyLoad () {
       if (this.$lozad) {
         if (this.$lozad.observer) {
@@ -129,18 +138,23 @@ const EmojiPicker = {
   watch: {
     keyword () {
       this.onScroll()
-      // Wait for the dom to change
-      this.$nextTick(() => this.initializeLazyLoad())
+      this.waitForDomAndInitializeLazyLoad()
     },
     allCustomGroups () {
-      this.$nextTick(() => this.initializeLazyLoad())
+      this.waitForDomAndInitializeLazyLoad()
+    },
+    showing (val) {
+      if (val) {
+        this.contentLoaded = true
+        this.waitForDomAndInitializeLazyLoad()
+      }
     }
   },
   mounted () {
     if (this.defaultGroup) {
       this.highlight(this.defaultGroup)
     }
-    this.initializeLazyLoad()
+    this.waitForDomAndInitializeLazyLoad()
   },
   destroyed () {
     this.destroyLazyLoad()