Message / Emoji, Emoji Button: Fade-in animation (#1802)

src/components/common/helpers/renderText.tsx

@@ -3,7 +3,9 @@ import EMOJI_REGEX, { removeVS16s } from '../../../lib/twemojiRegex';
 
 import { RE_LINK_TEMPLATE, RE_MENTION_TEMPLATE } from '../../../config';
 import { IS_EMOJI_SUPPORTED } from '../../../util/environment';
-import { fixNonStandardEmoji, nativeToUnified } from '../../../util/emoji';
+import {
+  fixNonStandardEmoji, handleEmojiLoad, LOADED_EMOJIS, nativeToUnified,
+} from '../../../util/emoji';
 import buildClassName from '../../../util/buildClassName';
 import { compact } from '../../../util/iteratees';
 
@@ -14,7 +16,7 @@ type TextPart = string | Element;
 export type TextFilter = (
   'escape_html' | 'hq_emoji' | 'emoji' | 'emoji_html' | 'br' | 'br_html' | 'highlight' | 'links' |
   'simple_markdown' | 'simple_markdown_html'
-);
+  );
 
 const RE_LETTER_OR_DIGIT = /^[\d\wа-яё]$/i;
 const SIMPLE_MARKDOWN_REGEX = /(\*\*|__).+?\1/g;
@@ -102,16 +104,22 @@ function replaceEmojis(textParts: TextPart[], size: 'big' | 'small', type: 'jsx'
     return emojis.reduce((emojiResult: TextPart[], emoji, i) => {
       const code = nativeToUnified(removeVS16s(emoji));
       if (!code) return emojiResult;
+      const src = `./img-apple-${size === 'big' ? '160' : '64'}/${code}.png`;
       const className = buildClassName(
         'emoji',
         size === 'small' && 'emoji-small',
       );
+
       if (type === 'jsx') {
+        const isLoaded = LOADED_EMOJIS.has(src);
+
         emojiResult.push(
           <img
-            className={className}
-            src={`./img-apple-${size === 'big' ? '160' : '64'}/${code}.png`}
+            src={src}
+            className={`${className}${!isLoaded ? ' opacity-transition slow shown' : ''}`}
             alt={emoji}
+            data-path={src}
+            onLoad={!isLoaded ? handleEmojiLoad : undefined}
           />,
         );
       }

src/components/middle/composer/EmojiButton.scss

@@ -9,6 +9,7 @@
   cursor: pointer;
   font-size: 1.75rem;
   line-height: 2.5rem;
+
   background-color: transparent;
   transition: background-color 0.15s ease;
 

src/components/middle/composer/EmojiButton.tsx

@@ -1,6 +1,10 @@
-import React, { FC, memo, useCallback } from '../../../lib/teact/teact';
+import React, {
+  FC, memo, useCallback,
+} from '../../../lib/teact/teact';
 
 import { IS_EMOJI_SUPPORTED } from '../../../util/environment';
+import { handleEmojiLoad, LOADED_EMOJIS } from '../../../util/emoji';
+import buildClassName from '../../../util/buildClassName';
 
 import './EmojiButton.scss';
 
@@ -18,15 +22,30 @@ const EmojiButton: FC<OwnProps> = ({ emoji, focus, onClick }) => {
     onClick(emoji.native, emoji.id);
   }, [emoji, onClick]);
 
+  const className = buildClassName(
+    'EmojiButton',
+    focus && 'focus',
+  );
+
+  const src = `./img-apple-64/${emoji.image}.png`;
+  const isLoaded = LOADED_EMOJIS.has(src);
+
   return (
     <div
-      className={`EmojiButton ${focus ? 'focus' : ''}`}
+      className={className}
       onMouseDown={handleClick}
       title={`:${emoji.names[0]}:`}
     >
-      {IS_EMOJI_SUPPORTED
-        ? emoji.native
-        : <img src={`./img-apple-64/${emoji.image}.png`} alt={emoji.native} loading="lazy" />}
+      {IS_EMOJI_SUPPORTED ? emoji.native : (
+        <img
+          src={src}
+          className={!isLoaded ? 'opacity-transition shown' : undefined}
+          alt={emoji.native}
+          loading="lazy"
+          data-path={src}
+          onLoad={!isLoaded ? handleEmojiLoad : undefined}
+        />
+      )}
     </div>
   );
 };

src/components/middle/composer/EmojiPicker.tsx

@@ -219,7 +219,7 @@ const EmojiPicker: FC<OwnProps & StateProps> = ({
 
 async function ensureEmojiData() {
   if (!emojiDataPromise) {
-    emojiDataPromise = import('emoji-data-ios/emoji-data.json') as unknown as Promise<EmojiModule>;
+    emojiDataPromise = import('emoji-data-ios/emoji-data.json');
     emojiRawData = (await emojiDataPromise).default;
 
     emojiData = uncompressEmoji(emojiRawData);

src/styles/index.scss

@@ -64,6 +64,7 @@ body.cursor-ew-resize {
 
 #root {
   height: 100%;
+
   @media (max-width: 600px) {
     height: calc(var(--vh, 1vh) * 100);
   }
@@ -265,10 +266,12 @@ div[role="button"] {
     transform: scale(0.5);
     opacity: 0.8;
   }
+
   50% {
     transform: scale(1.1);
     opacity: 1;
   }
+
   100% {
     transform: scale(1);
   }
@@ -279,6 +282,7 @@ div[role="button"] {
     transform: scale(1);
     opacity: 0.4;
   }
+
   to {
     transform: scale(0.5);
     opacity: 0;

src/util/emoji.ts

@@ -28,6 +28,13 @@ function unifiedToNative(unified: string) {
   return String.fromCodePoint(...codePoints);
 }
 
+export const LOADED_EMOJIS = new Set<string>();
+
+export function handleEmojiLoad(event: React.SyntheticEvent<HTMLImageElement>) {
+  event.currentTarget.classList.add('open');
+  LOADED_EMOJIS.add(event.currentTarget.dataset.path!);
+}
+
 export function fixNonStandardEmoji(text: string) {
   // Non-standard sequences typically parsed as separate emojis, so no need to fix text without any
   if (!text.match(EMOJI_REGEX)) return text;
@@ -51,7 +58,7 @@ export function nativeToUnified(emoji: string) {
         if (emoji.charCodeAt(i + 1) >= 0xdc00 && emoji.charCodeAt(i + 1) <= 0xdfff) {
           pairs.push(
             (emoji.charCodeAt(i) - 0xd800) * 0x400
-              + (emoji.charCodeAt(i + 1) - 0xdc00) + 0x10000,
+            + (emoji.charCodeAt(i + 1) - 0xdc00) + 0x10000,
           );
         }
       } else if (emoji.charCodeAt(i) < 0xd800 || emoji.charCodeAt(i) > 0xdfff) {