From a7ebcaf6646b894b8007bab3821e1abb614b2a3f Mon Sep 17 00:00:00 2001
From: Alexander Zinchuk <alx.zinchuk@gmail.com>
Date: Tue, 6 Dec 2022 13:29:44 +0100
Subject: [PATCH] Composer: Support animated emojis in input (#2143)

---
 src/components/common/CustomEmoji.tsx         |   2 -
 src/components/common/hooks/useCustomEmoji.ts |  22 +-
 src/components/middle/MessageList.tsx         |  23 +-
 .../middle/composer/AttachMenu.scss           |   4 +-
 .../middle/composer/AttachmentModal.scss      |   1 +
 src/components/middle/composer/Composer.scss  | 103 +++++----
 src/components/middle/composer/Composer.tsx   |   2 +-
 .../middle/composer/MessageInput.tsx          | 128 ++++++-----
 .../middle/composer/StickerSetCover.tsx       |  15 +-
 .../middle/composer/SymbolMenuFooter.tsx      |   2 +-
 .../middle/composer/TextFormatter.scss        |   1 +
 .../middle/composer/helpers/customEmoji.ts    |  21 +-
 .../middle/composer/hooks/useEditing.ts       |   4 +-
 .../composer/hooks/useInputCustomEmojis.ts    | 198 ++++++++++++++++++
 src/components/ui/Spinner.tsx                 |   7 +-
 src/hooks/useBoundsInSharedCanvas.ts          |  26 +--
 src/hooks/useEnsureCustomEmoji.ts             |   5 +-
 src/hooks/useResizeObserver.ts                |  32 +++
 src/lib/rlottie/RLottie.ts                    |  10 +-
 src/styles/index.scss                         |   2 +-
 src/util/AbsoluteVideo.ts                     |  71 +++++++
 src/util/customEmojiManager.ts                | 111 ++++++++--
 22 files changed, 604 insertions(+), 186 deletions(-)
 create mode 100644 src/components/middle/composer/hooks/useInputCustomEmojis.ts
 create mode 100644 src/hooks/useResizeObserver.ts
 create mode 100644 src/util/AbsoluteVideo.ts

diff --git a/src/components/common/CustomEmoji.tsx b/src/components/common/CustomEmoji.tsx
index b7c76e18d..d604b2344 100644
--- a/src/components/common/CustomEmoji.tsx
+++ b/src/components/common/CustomEmoji.tsx
@@ -13,7 +13,6 @@ import buildClassName from '../../util/buildClassName';
 import safePlay from '../../util/safePlay';
 import { selectIsAlwaysHighPriorityEmoji, selectIsDefaultEmojiStatusPack } from '../../global/selectors';
 
-import useEnsureCustomEmoji from '../../hooks/useEnsureCustomEmoji';
 import useCustomEmoji from './hooks/useCustomEmoji';
 
 import StickerView from './StickerView';
@@ -72,7 +71,6 @@ const CustomEmoji: FC<OwnProps> = ({
 
   // An alternative to `withGlobal` to avoid adding numerous global containers
   const customEmoji = useCustomEmoji(documentId);
-  useEnsureCustomEmoji(documentId);
 
   const loopCountRef = useRef(0);
   const [shouldLoop, setShouldLoop] = useState(true);
diff --git a/src/components/common/hooks/useCustomEmoji.ts b/src/components/common/hooks/useCustomEmoji.ts
index 971c81cba..2fb47018d 100644
--- a/src/components/common/hooks/useCustomEmoji.ts
+++ b/src/components/common/hooks/useCustomEmoji.ts
@@ -1,27 +1,17 @@
 import { useCallback, useEffect, useState } from '../../../lib/teact/teact';
-import { addCallback } from '../../../lib/teact/teactn';
 import { getGlobal } from '../../../global';
 
-import type { GlobalState } from '../../../global/types';
 import type { ApiSticker } from '../../../api/types';
 
-const handlers = new Set<AnyToVoidFunction>();
+import { addCustomEmojiCallback, removeCustomEmojiCallback } from '../../../util/customEmojiManager';
 
-let prevGlobal: GlobalState | undefined;
-
-addCallback((global: GlobalState) => {
-  if (global.customEmojis.byId !== prevGlobal?.customEmojis.byId) {
-    for (const handler of handlers) {
-      handler();
-    }
-  }
-
-  prevGlobal = global;
-});
+import useEnsureCustomEmoji from '../../../hooks/useEnsureCustomEmoji';
 
 export default function useCustomEmoji(documentId: string) {
   const [customEmoji, setCustomEmoji] = useState<ApiSticker | undefined>(getGlobal().customEmojis.byId[documentId]);
 
+  useEnsureCustomEmoji(documentId);
+
   const handleGlobalChange = useCallback(() => {
     setCustomEmoji(getGlobal().customEmojis.byId[documentId]);
   }, [documentId]);
@@ -31,10 +21,10 @@ export default function useCustomEmoji(documentId: string) {
   useEffect(() => {
     if (customEmoji) return undefined;
 
-    handlers.add(handleGlobalChange);
+    addCustomEmojiCallback(handleGlobalChange, documentId);
 
     return () => {
-      handlers.delete(handleGlobalChange);
+      removeCustomEmojiCallback(handleGlobalChange);
     };
   }, [customEmoji, documentId, handleGlobalChange]);
 
diff --git a/src/components/middle/MessageList.tsx b/src/components/middle/MessageList.tsx
index f0dd07442..a1dfdee45 100644
--- a/src/components/middle/MessageList.tsx
+++ b/src/components/middle/MessageList.tsx
@@ -58,6 +58,7 @@ import useNativeCopySelectedMessages from '../../hooks/useNativeCopySelectedMess
 import useMedia from '../../hooks/useMedia';
 import useLayoutEffectWithPrevDeps from '../../hooks/useLayoutEffectWithPrevDeps';
 import useEffectWithPrevDeps from '../../hooks/useEffectWithPrevDeps';
+import { useResizeObserver } from '../../hooks/useResizeObserver';
 
 import Loading from '../ui/Loading';
 import MessageListContent from './MessageListContent';
@@ -297,26 +298,10 @@ const MessageList: FC<OwnProps & StateProps> = ({
   }, [updateStickyDates, hasTools, type, setScrollOffset, chatId, threadId]);
 
   // Container resize observer (caused by Composer reply/webpage panels)
-  useEffect(() => {
-    if (!('ResizeObserver' in window) || process.env.APP_ENV === 'perf') {
-      return undefined;
-    }
-
-    const observer = new ResizeObserver(([entry]) => {
-      // During animation
-      if (!(entry.target as HTMLDivElement).offsetParent) {
-        return;
-      }
-
-      setContainerHeight(entry.contentRect.height);
-    });
-
-    observer.observe(containerRef.current!);
-
-    return () => {
-      observer.disconnect();
-    };
+  const handleResize = useCallback((entry: ResizeObserverEntry) => {
+    setContainerHeight(entry.contentRect.height);
   }, []);
+  useResizeObserver(containerRef, handleResize);
 
   // Memorize height for scroll animation
   const { height: windowHeight } = useWindowSize();
diff --git a/src/components/middle/composer/AttachMenu.scss b/src/components/middle/composer/AttachMenu.scss
index d099e371b..70627b9d5 100644
--- a/src/components/middle/composer/AttachMenu.scss
+++ b/src/components/middle/composer/AttachMenu.scss
@@ -1,5 +1,7 @@
 .AttachMenu {
-  align-self: flex-end;
+  position: absolute;
+  right: 0;
+  bottom: 0;
 
   &--button {
     &:focus {
diff --git a/src/components/middle/composer/AttachmentModal.scss b/src/components/middle/composer/AttachmentModal.scss
index d8f3e4c3b..7dbd4643e 100644
--- a/src/components/middle/composer/AttachmentModal.scss
+++ b/src/components/middle/composer/AttachmentModal.scss
@@ -77,6 +77,7 @@
 
   .drop-target {
     position: relative;
+    overflow: hidden;
 
     &::before,
     &::after {
diff --git a/src/components/middle/composer/Composer.scss b/src/components/middle/composer/Composer.scss
index 17de952af..18ce772c6 100644
--- a/src/components/middle/composer/Composer.scss
+++ b/src/components/middle/composer/Composer.scss
@@ -249,12 +249,21 @@
 .message-input-wrapper {
   display: flex;
 
+  .input-scroller {
+    margin-right: 0.5rem;
+    padding-right: 2.5rem;
+  }
+
   > .Spinner {
     align-self: center;
     --spinner-size: 1.5rem;
     margin-right: -0.5rem;
   }
 
+  .inline-bot-spinner {
+    margin-right: 3rem;
+  }
+
   > .AttachMenu > .Button,
   > .Button {
     flex-shrink: 0;
@@ -402,6 +411,45 @@
   }
 }
 
+.input-scroller {
+  min-height: 3.5rem;
+  max-height: 26rem;
+  overflow: hidden;
+
+  &.overflown {
+    overflow-y: auto;
+  }
+
+  @media (max-width: 600px) {
+    min-height: 2.875rem;
+    max-height: 16rem;
+  }
+
+  & > .input-scroller-content {
+    position: relative;
+  }
+
+  /* stylelint-disable-next-line plugin/no-low-performance-animation-properties */
+  transition: height 100ms ease;
+
+  body.animation-level-0 & {
+    transition: none !important;
+  }
+
+  .emoji {
+    width: 1.25rem;
+    height: 1.25rem;
+    margin: 0 1px -5px;
+    vertical-align: 0;
+    pointer-events: none;
+  }
+
+  .custom-emoji {
+    margin: 0;
+    vertical-align: text-top;
+  }
+}
+
 #message-input-text,
 #caption-input-text {
   position: relative;
@@ -410,16 +458,18 @@
     padding: calc((3.25rem - var(--composer-text-size, 1rem) * 1.375) / 2 - var(--border-width, 0) * 2)
       calc(0.9rem - var(--border-width));
     overflow: hidden;
+    height: auto;
     line-height: 1.375;
     font-family: var(--font-family);
     unicode-bidi: plaintext;
     text-align: initial;
     font-size: var(--composer-text-size, 1rem);
 
-    &.overflown {
-      overflow-y: auto;
-      overflow-x: hidden;
-    }
+    background: transparent !important;
+    border: none !important;
+    border-radius: 0 !important;
+    box-shadow: none !important;
+    caret-color: var(--color-text);
 
     &.touched,
     &:focus {
@@ -496,6 +546,7 @@
     position: absolute;
     top: 0;
     left: 0;
+    right: 0;
     opacity: 0;
     pointer-events: none;
     z-index: -10;
@@ -509,30 +560,13 @@
 
   .form-control {
     margin-bottom: 0;
-    background: transparent !important;
-    border: none !important;
-    border-radius: 0 !important;
-    box-shadow: none !important;
-    caret-color: var(--color-text);
-    min-height: 3.5rem;
-    max-height: 26rem;
     line-height: 1.3125;
     padding: calc((3.5rem - var(--composer-text-size, 1rem) * 1.3125) / 2) 0;
     white-space: pre-wrap;
+    height: auto;
 
     @media (max-width: 600px) {
-      height: 2.875rem;
-      min-height: 2.875rem;
-      max-height: 16rem;
       padding: calc((2.875rem - var(--composer-text-size, 1rem) * 1.3125) / 2) 0;
-      overflow: auto;
-    }
-
-    /* stylelint-disable-next-line plugin/no-low-performance-animation-properties */
-    transition: height 100ms ease;
-
-    body.animation-level-0 & {
-      transition: none !important;
     }
   }
 
@@ -562,25 +596,22 @@
       margin-top: 0.75rem;
     }
   }
-
-  .emoji {
-    width: 1.25rem;
-    height: 1.25rem;
-    margin: 0 1px -5px;
-    vertical-align: 0;
-    pointer-events: none;
-  }
-
-  .custom-emoji {
-    vertical-align: text-top;
-  }
 }
 
 #caption-input-text {
-  .form-control {
-    height: 3.25rem;
+  border: 1px solid var(--color-borders-input);
+  border-radius: var(--border-radius-default);
+  margin-bottom: 0.5rem;
+
+  .input-scroller {
     min-height: 3.25rem;
     max-height: 15rem;
+
+    margin-right: 0.5rem;
+
+    &:has(.form-control:focus) {
+      border-color: var(--color-primary);
+    }
   }
 
   .placeholder-text {
diff --git a/src/components/middle/composer/Composer.tsx b/src/components/middle/composer/Composer.tsx
index 1515c5cb7..002ace436 100644
--- a/src/components/middle/composer/Composer.tsx
+++ b/src/components/middle/composer/Composer.tsx
@@ -1261,7 +1261,7 @@ const Composer: FC<OwnProps & StateProps> = ({
             onSuppressedFocus={closeSymbolMenu}
           />
           {isInlineBotLoading && Boolean(inlineBotId) && (
-            <Spinner color="gray" />
+            <Spinner color="gray" className="inline-bot-spinner" />
           )}
           {withScheduledButton && (
             <Button
diff --git a/src/components/middle/composer/MessageInput.tsx b/src/components/middle/composer/MessageInput.tsx
index 51cf29c3c..87d56c0e9 100644
--- a/src/components/middle/composer/MessageInput.tsx
+++ b/src/components/middle/composer/MessageInput.tsx
@@ -17,13 +17,15 @@ import {
 } from '../../../util/environment';
 import captureKeyboardListeners from '../../../util/captureKeyboardListeners';
 import { getIsDirectTextInputDisabled } from '../../../util/directInputManager';
+import parseEmojiOnlyString from '../../../util/parseEmojiOnlyString';
+import { isSelectionInsideInput } from './helpers/selection';
+import renderText from '../../common/helpers/renderText';
+
 import useLayoutEffectWithPrevDeps from '../../../hooks/useLayoutEffectWithPrevDeps';
 import useFlag from '../../../hooks/useFlag';
 import { isHeavyAnimating } from '../../../hooks/useHeavyAnimationCheck';
 import useLang from '../../../hooks/useLang';
-import parseEmojiOnlyString from '../../../util/parseEmojiOnlyString';
-import { isSelectionInsideInput } from './helpers/selection';
-import renderText from '../../common/helpers/renderText';
+import useInputCustomEmojis from './hooks/useInputCustomEmojis';
 
 import TextFormatter from './TextFormatter';
 
@@ -32,6 +34,8 @@ const CONTEXT_MENU_CLOSE_DELAY_MS = 100;
 const FOCUS_DELAY_MS = 350;
 const TRANSITION_DURATION_FACTOR = 50;
 
+const SCROLLER_CLASS = 'input-scroller';
+
 type OwnProps = {
   id: string;
   chatId: string;
@@ -58,6 +62,7 @@ type StateProps = {
 };
 
 const MAX_INPUT_HEIGHT = IS_SINGLE_COLUMN_LAYOUT ? 256 : 416;
+const MAX_ATTACHMENT_MODAL_INPUT_HEIGHT = 240;
 const TAB_INDEX_PRIORITY_TIMEOUT = 2000;
 // Heuristics allowing the user to make a triple click
 const SELECTION_RECALCULATE_DELAY_MS = 260;
@@ -112,6 +117,14 @@ const MessageInput: FC<OwnProps & StateProps> = ({
   const selectionTimeoutRef = useRef<number>(null);
   // eslint-disable-next-line no-null/no-null
   const cloneRef = useRef<HTMLDivElement>(null);
+  // eslint-disable-next-line no-null/no-null
+  const scrollerCloneRef = useRef<HTMLDivElement>(null);
+  // eslint-disable-next-line no-null/no-null
+  const sharedCanvasRef = useRef<HTMLCanvasElement>(null);
+  // eslint-disable-next-line no-null/no-null
+  const sharedCanvasHqRef = useRef<HTMLCanvasElement>(null);
+  // eslint-disable-next-line no-null/no-null
+  const absoluteContainerRef = useRef<HTMLDivElement>(null);
 
   const lang = useLang();
   const isContextMenuOpenRef = useRef(false);
@@ -120,10 +133,40 @@ const MessageInput: FC<OwnProps & StateProps> = ({
   const [selectedRange, setSelectedRange] = useState<Range>();
   const [isTextFormatterDisabled, setIsTextFormatterDisabled] = useState<boolean>(false);
 
+  useInputCustomEmojis(html, inputRef, sharedCanvasRef, sharedCanvasHqRef, absoluteContainerRef);
+
+  const updateInputHeight = useCallback((willSend = false) => {
+    const scroller = inputRef.current!.closest<HTMLDivElement>(`.${SCROLLER_CLASS}`)!;
+    const clone = scrollerCloneRef.current!;
+    const currentHeight = Number(scroller.style.height.replace('px', ''));
+    const maxHeight = isAttachmentModalInput ? MAX_ATTACHMENT_MODAL_INPUT_HEIGHT : MAX_INPUT_HEIGHT;
+    const newHeight = Math.min(clone.scrollHeight, maxHeight);
+    if (newHeight === currentHeight) {
+      return;
+    }
+
+    const transitionDuration = Math.round(
+      TRANSITION_DURATION_FACTOR * Math.log(Math.abs(newHeight - currentHeight)),
+    );
+
+    const exec = () => {
+      scroller.style.height = `${newHeight}px`;
+      scroller.style.transitionDuration = `${transitionDuration}ms`;
+      scroller.classList.toggle('overflown', clone.scrollHeight > maxHeight);
+    };
+
+    if (willSend) {
+      // Sync with sending animation
+      requestAnimationFrame(exec);
+    } else {
+      exec();
+    }
+  }, [isAttachmentModalInput]);
+
   useEffect(() => {
     if (!isAttachmentModalInput) return;
     updateInputHeight(false);
-  }, [isAttachmentModalInput]);
+  }, [isAttachmentModalInput, updateInputHeight]);
 
   useLayoutEffectWithPrevDeps(([prevHtml]) => {
     if (html !== inputRef.current!.innerHTML) {
@@ -331,33 +374,6 @@ const MessageInput: FC<OwnProps & StateProps> = ({
     }
   }
 
-  function updateInputHeight(willSend = false) {
-    const input = inputRef.current!;
-    const clone = cloneRef.current!;
-    const currentHeight = Number(input.style.height.replace('px', ''));
-    const newHeight = Math.min(clone.scrollHeight, MAX_INPUT_HEIGHT);
-    if (newHeight === currentHeight) {
-      return;
-    }
-
-    const transitionDuration = Math.round(
-      TRANSITION_DURATION_FACTOR * Math.log(Math.abs(newHeight - currentHeight)),
-    );
-
-    const exec = () => {
-      input.style.height = `${newHeight}px`;
-      input.style.transitionDuration = `${transitionDuration}ms`;
-      input.classList.toggle('overflown', clone.scrollHeight > MAX_INPUT_HEIGHT);
-    };
-
-    if (willSend) {
-      // Sync with sending animation
-      requestAnimationFrame(exec);
-    } else {
-      exec();
-    }
-  }
-
   useEffect(() => {
     if (IS_TOUCH_ENV) {
       return;
@@ -450,37 +466,47 @@ const MessageInput: FC<OwnProps & StateProps> = ({
   }, [shouldSuppressFocus]);
 
   const className = buildClassName(
-    'form-control custom-scroll',
+    'form-control',
     html.length > 0 && 'touched',
     shouldSuppressFocus && 'focus-disabled',
   );
 
   return (
     <div id={id} onClick={shouldSuppressFocus ? onSuppressedFocus : undefined} dir={lang.isRtl ? 'rtl' : undefined}>
-      <div
-        ref={inputRef}
-        id={editableInputId || EDITABLE_INPUT_ID}
-        className={className}
-        contentEditable
-        role="textbox"
-        dir="auto"
-        tabIndex={0}
-        onClick={focusInput}
-        onChange={handleChange}
-        onKeyDown={handleKeyDown}
-        onMouseDown={handleMouseDown}
-        onContextMenu={IS_ANDROID ? handleAndroidContextMenu : undefined}
-        onTouchCancel={IS_ANDROID ? processSelectionWithTimeout : undefined}
-        aria-label={placeholder}
-      />
+      <div className={buildClassName('custom-scroll', SCROLLER_CLASS)}>
+        <div className="input-scroller-content">
+          <div
+            ref={inputRef}
+            id={editableInputId || EDITABLE_INPUT_ID}
+            className={className}
+            contentEditable
+            role="textbox"
+            dir="auto"
+            tabIndex={0}
+            onClick={focusInput}
+            onChange={handleChange}
+            onKeyDown={handleKeyDown}
+            onMouseDown={handleMouseDown}
+            onContextMenu={IS_ANDROID ? handleAndroidContextMenu : undefined}
+            onTouchCancel={IS_ANDROID ? processSelectionWithTimeout : undefined}
+            aria-label={placeholder}
+          />
+          {!forcedPlaceholder && <span className="placeholder-text" dir="auto">{placeholder}</span>}
+          <canvas ref={sharedCanvasRef} className="shared-canvas" />
+          <canvas ref={sharedCanvasHqRef} className="shared-canvas" />
+          <div ref={absoluteContainerRef} className="absolute-video-container" />
+        </div>
+      </div>
+      <div ref={scrollerCloneRef} className={buildClassName('custom-scroll', SCROLLER_CLASS, 'clone')}>
+        <div className="input-scroller-content">
+          <div ref={cloneRef} className={buildClassName(className, 'clone')} dir="auto" />
+        </div>
+      </div>
       {captionLimit && (
         <div className="max-length-indicator" dir="auto">
           {captionLimit}
         </div>
       )}
-
-      <div ref={cloneRef} className={buildClassName(className, 'clone')} dir="auto" />
-      {!forcedPlaceholder && <span className="placeholder-text" dir="auto">{placeholder}</span>}
       <TextFormatter
         isOpen={isTextFormatterOpen}
         anchorPosition={textFormatterAnchorPosition}
diff --git a/src/components/middle/composer/StickerSetCover.tsx b/src/components/middle/composer/StickerSetCover.tsx
index 667e77104..c850bafb1 100644
--- a/src/components/middle/composer/StickerSetCover.tsx
+++ b/src/components/middle/composer/StickerSetCover.tsx
@@ -10,6 +10,8 @@ import { selectIsAlwaysHighPriorityEmoji } from '../../../global/selectors';
 import { IS_WEBM_SUPPORTED } from '../../../util/environment';
 import { getFirstLetters } from '../../../util/textFormat';
 import buildClassName from '../../../util/buildClassName';
+import { getStickerPreviewHash } from '../../../global/helpers';
+
 import { useIsIntersecting } from '../../../hooks/useIntersectionObserver';
 import useMedia from '../../../hooks/useMedia';
 import useMediaTransition from '../../../hooks/useMediaTransition';
@@ -42,8 +44,13 @@ const StickerSetCover: FC<OwnProps> = ({
 
   const isIntersecting = useIsIntersecting(containerRef, observeIntersection);
 
-  const mediaData = useMedia((hasThumbnail || isLottie) && `stickerSet${stickerSet.id}`, !isIntersecting);
-  const isReady = mediaData && (!isVideo || IS_WEBM_SUPPORTED);
+  const shouldFallbackToStatic = stickerSet.stickers && isVideo && !IS_WEBM_SUPPORTED;
+  const staticHash = shouldFallbackToStatic && getStickerPreviewHash(stickerSet.stickers![0].id);
+  const staticMediaData = useMedia(staticHash, !isIntersecting);
+
+  const mediaHash = ((hasThumbnail && !shouldFallbackToStatic) || isLottie) && `stickerSet${stickerSet.id}`;
+  const mediaData = useMedia(mediaHash, !isIntersecting);
+  const isReady = mediaData || staticMediaData;
   const transitionClassNames = useMediaTransition(isReady);
 
   const bounds = useBoundsInSharedCanvas(containerRef, sharedCanvasRef);
@@ -61,7 +68,7 @@ const StickerSetCover: FC<OwnProps> = ({
             sharedCanvas={sharedCanvasRef?.current || undefined}
             sharedCanvasCoords={bounds.coords}
           />
-        ) : isVideo ? (
+        ) : (isVideo && !shouldFallbackToStatic) ? (
           <OptimizedVideo
             className={buildClassName(styles.video, transitionClassNames)}
             src={mediaData}
@@ -71,7 +78,7 @@ const StickerSetCover: FC<OwnProps> = ({
           />
         ) : (
           <img
-            src={mediaData}
+            src={mediaData || staticMediaData}
             className={transitionClassNames}
             alt=""
           />
diff --git a/src/components/middle/composer/SymbolMenuFooter.tsx b/src/components/middle/composer/SymbolMenuFooter.tsx
index ad157f937..abb683f61 100644
--- a/src/components/middle/composer/SymbolMenuFooter.tsx
+++ b/src/components/middle/composer/SymbolMenuFooter.tsx
@@ -82,7 +82,7 @@ const SymbolMenuFooter: FC<OwnProps> = ({
       {renderTabButton(SymbolMenuTabs.Stickers)}
       {renderTabButton(SymbolMenuTabs.GIFs)}
 
-      {activeTab === SymbolMenuTabs.Emoji && (
+      {(activeTab === SymbolMenuTabs.Emoji || activeTab === SymbolMenuTabs.CustomEmoji) && (
         <Button
           className="symbol-delete-button"
           onClick={onRemoveSymbol}
diff --git a/src/components/middle/composer/TextFormatter.scss b/src/components/middle/composer/TextFormatter.scss
index 0b2b7c3db..addc47a6e 100644
--- a/src/components/middle/composer/TextFormatter.scss
+++ b/src/components/middle/composer/TextFormatter.scss
@@ -1,5 +1,6 @@
 .TextFormatter {
   transform: translate(-50%, -3.25rem);
+  z-index: 1;
 
   &,
   &-link-control {
diff --git a/src/components/middle/composer/helpers/customEmoji.ts b/src/components/middle/composer/helpers/customEmoji.ts
index 38126530d..919adfe84 100644
--- a/src/components/middle/composer/helpers/customEmoji.ts
+++ b/src/components/middle/composer/helpers/customEmoji.ts
@@ -1,37 +1,38 @@
 import type { ApiMessageEntityCustomEmoji, ApiSticker } from '../../../../api/types';
 import { ApiMessageEntityTypes } from '../../../../api/types';
 
+import { getGlobal } from '../../../../global';
 import { EMOJI_SIZES } from '../../../../config';
 import { REM } from '../../../common/helpers/mediaDimensions';
-import { getCustomEmojiPreviewMediaData } from '../../../../util/customEmojiManager';
-
-import placeholderSrc from '../../../../assets/square.svg';
+import { getInputCustomEmojiParams } from '../../../../util/customEmojiManager';
 
 export const INPUT_CUSTOM_EMOJI_SELECTOR = 'img[data-document-id]';
 
 export function buildCustomEmojiHtml(emoji: ApiSticker) {
-  const mediaData = getCustomEmojiPreviewMediaData(emoji.id);
+  const [isPlaceholder, src, uniqueId] = getInputCustomEmojiParams(emoji);
 
   return `<img
-    class="custom-emoji emoji emoji-small${!mediaData ? ' placeholder' : ''}"
+    class="custom-emoji emoji emoji-small ${isPlaceholder ? 'placeholder' : ''}"
     draggable="false"
     alt="${emoji.emoji}"
     data-document-id="${emoji.id}"
+    ${uniqueId ? `data-unique-id="${uniqueId}"` : ''}
     data-entity-type="${ApiMessageEntityTypes.CustomEmoji}"
-    src="${mediaData || placeholderSrc}"
+    src="${src}"
   />`;
 }
 
 export function buildCustomEmojiHtmlFromEntity(rawText: string, entity: ApiMessageEntityCustomEmoji) {
-  const mediaData = getCustomEmojiPreviewMediaData(entity.documentId);
-
+  const customEmoji = getGlobal().customEmojis.byId[entity.documentId];
+  const [isPlaceholder, src, uniqueId] = getInputCustomEmojiParams(customEmoji);
   return `<img
-    class="custom-emoji emoji emoji-small${!mediaData ? ' placeholder' : ''}"
+    class="custom-emoji emoji emoji-small ${isPlaceholder ? 'placeholder' : ''}"
     draggable="false"
     alt="${rawText}"
     data-document-id="${entity.documentId}"
+    ${uniqueId ? `data-unique-id="${uniqueId}"` : ''}
     data-entity-type="${ApiMessageEntityTypes.CustomEmoji}"
-    src="${mediaData || placeholderSrc}"
+    src="${src}"
   />`;
 }
 
diff --git a/src/components/middle/composer/hooks/useEditing.ts b/src/components/middle/composer/hooks/useEditing.ts
index aa59aa5cb..bf3fe3204 100644
--- a/src/components/middle/composer/hooks/useEditing.ts
+++ b/src/components/middle/composer/hooks/useEditing.ts
@@ -35,8 +35,8 @@ const useEditing = (
     if (prevEditedMessage?.id === editedMessage.id) {
       return;
     }
-
-    const html = getTextWithEntitiesAsHtml(editingDraft?.text.length ? editingDraft : editedMessage.content.text);
+    const text = !prevEditedMessage && editingDraft?.text.length ? editingDraft : editedMessage.content.text;
+    const html = getTextWithEntitiesAsHtml(text);
     setHtml(html);
     // `fastRaf` would execute syncronously in this case
     requestAnimationFrame(() => {
diff --git a/src/components/middle/composer/hooks/useInputCustomEmojis.ts b/src/components/middle/composer/hooks/useInputCustomEmojis.ts
new file mode 100644
index 000000000..519f8338f
--- /dev/null
+++ b/src/components/middle/composer/hooks/useInputCustomEmojis.ts
@@ -0,0 +1,198 @@
+import {
+  useCallback, useEffect, useRef,
+} from '../../../../lib/teact/teact';
+import RLottie from '../../../../lib/rlottie/RLottie';
+
+import type { ApiSticker } from '../../../../api/types';
+
+import { getGlobal } from '../../../../global';
+import { selectIsAlwaysHighPriorityEmoji } from '../../../../global/selectors';
+import generateIdFor from '../../../../util/generateIdFor';
+import {
+  addCustomEmojiInputRenderCallback,
+  getCustomEmojiMediaDataForInput,
+  removeCustomEmojiInputRenderCallback,
+} from '../../../../util/customEmojiManager';
+import { round } from '../../../../util/math';
+import { fastRaf } from '../../../../util/schedulers';
+import AbsoluteVideo from '../../../../util/AbsoluteVideo';
+
+import { useResizeObserver } from '../../../../hooks/useResizeObserver';
+import useBackgroundMode from '../../../../hooks/useBackgroundMode';
+
+const ID_STORE = {};
+const SIZE = 20;
+
+type Player = {
+  play: () => void;
+  pause: () => void;
+  destroy: () => void;
+  updatePosition: (x: number, y: number) => void;
+};
+
+export default function useInputCustomEmojis(
+  html: string,
+  inputRef: React.RefObject<HTMLDivElement>,
+  sharedCanvasRef: React.RefObject<HTMLCanvasElement>,
+  sharedCanvasHqRef: React.RefObject<HTMLCanvasElement>,
+  absoluteContainerRef: React.RefObject<HTMLElement>,
+) {
+  const mapRef = useRef<Map<string, Player>>(new Map());
+
+  const removeContainers = useCallback((ids: string[]) => {
+    ids.forEach((id) => {
+      const player = mapRef.current.get(id);
+      if (player) {
+        player.destroy();
+        mapRef.current.delete(id);
+      }
+    });
+  }, []);
+
+  const synchronizeElements = useCallback(() => {
+    if (!inputRef.current || !sharedCanvasRef.current || !sharedCanvasHqRef.current) return;
+    const global = getGlobal();
+    const removedContainers = new Set(mapRef.current.keys());
+    const customEmojies = Array.from(inputRef.current.querySelectorAll<HTMLElement>('.custom-emoji'));
+
+    customEmojies.forEach((element) => {
+      const id = element.dataset.uniqueId!;
+      const documentId = element.dataset.documentId!;
+      if (!id) {
+        return;
+      }
+      removedContainers.delete(id);
+
+      const mediaUrl = getCustomEmojiMediaDataForInput(documentId);
+      if (!mediaUrl) {
+        return;
+      }
+
+      const canvasBounds = sharedCanvasRef.current!.getBoundingClientRect();
+      const elementBounds = element.getBoundingClientRect();
+      const x = round((elementBounds.left - canvasBounds.left) / canvasBounds.width, 4);
+      const y = round((elementBounds.top - canvasBounds.top) / canvasBounds.height, 4);
+
+      if (mapRef.current.has(id)) {
+        const player = mapRef.current.get(id)!;
+        player.updatePosition(x, y);
+        return;
+      }
+
+      const customEmoji = global.customEmojis.byId[documentId];
+      if (!customEmoji) {
+        return;
+      }
+      const isHq = customEmoji?.stickerSetInfo && selectIsAlwaysHighPriorityEmoji(global, customEmoji.stickerSetInfo);
+
+      const animation = createPlayer({
+        customEmoji,
+        sharedCanvasRef,
+        sharedCanvasHqRef,
+        absoluteContainerRef,
+        uniqueId: id,
+        mediaUrl,
+        isHq,
+        position: { x, y },
+      });
+      animation.play();
+
+      mapRef.current.set(id, animation);
+    });
+
+    removeContainers(Array.from(removedContainers));
+  }, [absoluteContainerRef, inputRef, removeContainers, sharedCanvasHqRef, sharedCanvasRef]);
+
+  useEffect(() => {
+    addCustomEmojiInputRenderCallback(synchronizeElements);
+
+    return () => {
+      removeCustomEmojiInputRenderCallback(synchronizeElements);
+    };
+  }, [synchronizeElements]);
+
+  useEffect(() => {
+    if (!html || !inputRef.current || !sharedCanvasRef.current) {
+      removeContainers(Array.from(mapRef.current.keys()));
+      return;
+    }
+
+    synchronizeElements();
+  }, [html, inputRef, removeContainers, sharedCanvasRef, synchronizeElements]);
+
+  useResizeObserver(sharedCanvasRef, synchronizeElements, true);
+
+  const freezeAnimation = useCallback(() => {
+    mapRef.current.forEach((player) => {
+      player.pause();
+    });
+  }, []);
+
+  const unfreezeAnimation = useCallback(() => {
+    mapRef.current.forEach((player) => {
+      player.play();
+    });
+  }, []);
+
+  const unfreezeAnimationOnRaf = useCallback(() => {
+    fastRaf(unfreezeAnimation);
+  }, [unfreezeAnimation]);
+
+  // Pausing frame may not happen in background,
+  // so we need to make sure it happens right after focusing,
+  // then we can play again.
+  useBackgroundMode(freezeAnimation, unfreezeAnimationOnRaf);
+}
+
+function createPlayer({
+  customEmoji,
+  sharedCanvasRef,
+  sharedCanvasHqRef,
+  absoluteContainerRef,
+  uniqueId,
+  mediaUrl,
+  position,
+  isHq,
+} : {
+  customEmoji: ApiSticker;
+  sharedCanvasRef: React.RefObject<HTMLCanvasElement>;
+  sharedCanvasHqRef: React.RefObject<HTMLCanvasElement>;
+  absoluteContainerRef: React.RefObject<HTMLElement>;
+  uniqueId: string;
+  mediaUrl: string;
+  position: { x: number; y: number };
+  isHq?: boolean;
+}): Player {
+  if (customEmoji.isLottie) {
+    const lottie = RLottie.init(
+      uniqueId,
+      isHq ? sharedCanvasHqRef.current! : sharedCanvasRef.current!,
+      undefined,
+      generateIdFor(ID_STORE, true),
+      mediaUrl,
+      {
+        size: SIZE,
+        coords: position,
+        isLowPriority: !isHq,
+      },
+    );
+    return {
+      play: () => lottie.play(),
+      pause: () => lottie.pause(),
+      destroy: () => lottie.removeContainer(uniqueId),
+      updatePosition: (x: number, y: number) => lottie.setSharedCanvasCoords(uniqueId, { x, y }),
+    };
+  }
+
+  if (customEmoji.isVideo) {
+    const absoluteVideo = new AbsoluteVideo(mediaUrl, absoluteContainerRef.current!, { size: SIZE, position });
+    return {
+      play: () => absoluteVideo.play(),
+      pause: () => absoluteVideo.pause(),
+      destroy: () => absoluteVideo.destroy(),
+      updatePosition: (x: number, y: number) => absoluteVideo.updatePosition({ x, y }),
+    };
+  }
+
+  throw new Error('Unsupported custom emoji type');
+}
diff --git a/src/components/ui/Spinner.tsx b/src/components/ui/Spinner.tsx
index cfd2cb13b..24ad38828 100644
--- a/src/components/ui/Spinner.tsx
+++ b/src/components/ui/Spinner.tsx
@@ -8,12 +8,17 @@ import './Spinner.scss';
 const Spinner: FC<{
   color?: 'blue' | 'white' | 'black' | 'green' | 'gray' | 'yellow';
   backgroundColor?: 'light' | 'dark';
+  className?: string;
 }> = ({
   color = 'blue',
   backgroundColor,
+  className,
 }) => {
   return (
-    <div className={buildClassName('Spinner', color, backgroundColor && 'with-background', `bg-${backgroundColor}`)}>
+    <div className={buildClassName(
+      'Spinner', className, color, backgroundColor && 'with-background', `bg-${backgroundColor}`,
+    )}
+    >
       <div />
     </div>
   );
diff --git a/src/hooks/useBoundsInSharedCanvas.ts b/src/hooks/useBoundsInSharedCanvas.ts
index e1f3c0723..65b2a2b85 100644
--- a/src/hooks/useBoundsInSharedCanvas.ts
+++ b/src/hooks/useBoundsInSharedCanvas.ts
@@ -1,10 +1,11 @@
 import {
-  useCallback, useEffect, useLayoutEffect, useMemo, useState,
+  useCallback, useLayoutEffect, useMemo, useState,
 } from '../lib/teact/teact';
 
-import { throttle } from '../util/schedulers';
 import { round } from '../util/math';
 
+import { useResizeObserver } from './useResizeObserver';
+
 export default function useBoundsInSharedCanvas(
   containerRef: React.RefObject<HTMLDivElement>,
   sharedCanvasRef?: React.RefObject<HTMLCanvasElement>,
@@ -32,26 +33,7 @@ export default function useBoundsInSharedCanvas(
 
   useLayoutEffect(recalculate, [recalculate]);
 
-  useEffect(() => {
-    if (!('ResizeObserver' in window) || !sharedCanvasRef?.current) {
-      return undefined;
-    }
-
-    const observer = new ResizeObserver(throttle(([entry]) => {
-      // During animation
-      if (!(entry.target as HTMLCanvasElement).offsetParent) {
-        return;
-      }
-
-      recalculate();
-    }, 300, false));
-
-    observer.observe(sharedCanvasRef.current);
-
-    return () => {
-      observer.disconnect();
-    };
-  }, [recalculate, sharedCanvasRef]);
+  useResizeObserver(sharedCanvasRef, recalculate, true);
 
   const coords = useMemo(() => (x !== undefined && y !== undefined ? { x, y } : undefined), [x, y]);
 
diff --git a/src/hooks/useEnsureCustomEmoji.ts b/src/hooks/useEnsureCustomEmoji.ts
index 43711f9a7..90f3d0fb8 100644
--- a/src/hooks/useEnsureCustomEmoji.ts
+++ b/src/hooks/useEnsureCustomEmoji.ts
@@ -1,4 +1,5 @@
 import { getActions, getGlobal } from '../global';
+import { addCustomEmojiInputRenderCallback } from '../util/customEmojiManager';
 
 import { throttle } from '../util/schedulers';
 
@@ -24,11 +25,13 @@ const updateLastRendered = throttle(() => {
   RENDER_HISTORY.clear();
 }, THROTTLE, false);
 
-export function notifyCustomEmojiRender(emojiId: string) {
+function notifyCustomEmojiRender(emojiId: string) {
   RENDER_HISTORY.add(emojiId);
   updateLastRendered();
 }
 
+addCustomEmojiInputRenderCallback(notifyCustomEmojiRender);
+
 export default function useEnsureCustomEmoji(id: string) {
   const lastSyncTime = useLastSyncTime();
   notifyCustomEmojiRender(id);
diff --git a/src/hooks/useResizeObserver.ts b/src/hooks/useResizeObserver.ts
new file mode 100644
index 000000000..505db5063
--- /dev/null
+++ b/src/hooks/useResizeObserver.ts
@@ -0,0 +1,32 @@
+import { useEffect } from '../lib/teact/teact';
+import { throttle } from '../util/schedulers';
+
+const THROTTLE = 300;
+
+export function useResizeObserver(
+  ref: React.RefObject<HTMLElement> | undefined,
+  onResize: (entry: ResizeObserverEntry) => void,
+  withThrottle = false,
+) {
+  useEffect(() => {
+    if (!('ResizeObserver' in window) || !ref?.current) {
+      return undefined;
+    }
+
+    const callback: ResizeObserverCallback = ([entry]) => {
+      // During animation
+      if (!(entry.target as HTMLElement).offsetParent) {
+        return;
+      }
+
+      onResize(entry);
+    };
+    const observer = new ResizeObserver(withThrottle ? throttle(callback, THROTTLE, false) : callback);
+
+    observer.observe(ref.current);
+
+    return () => {
+      observer.disconnect();
+    };
+  }, [onResize, ref, withThrottle]);
+}
diff --git a/src/lib/rlottie/RLottie.ts b/src/lib/rlottie/RLottie.ts
index 279bc0bf2..47ad1f5f5 100644
--- a/src/lib/rlottie/RLottie.ts
+++ b/src/lib/rlottie/RLottie.ts
@@ -206,7 +206,7 @@ class RLottie {
   setSharedCanvasCoords(containerId: string, newCoords: Params['coords']) {
     const containerInfo = this.containers.get(containerId)!;
     const {
-      canvas, ctx, isPaused, coords,
+      canvas, ctx,
     } = containerInfo;
 
     if (!canvas.dataset.isJustCleaned || canvas.dataset.isJustCleaned === 'false') {
@@ -224,12 +224,10 @@ class RLottie {
       y: Math.round((newCoords?.y || 0) * canvas.height),
     };
 
-    if (isPaused || !this.isPlaying()) {
-      const frame = this.getFrame(this.prevFrameIndex) || this.getFrame(Math.round(this.approxFrameIndex));
+    const frame = this.getFrame(this.prevFrameIndex) || this.getFrame(Math.round(this.approxFrameIndex));
 
-      if (frame && frame !== WAITING) {
-        ctx.drawImage(frame, coords!.x, coords!.y);
-      }
+    if (frame && frame !== WAITING) {
+      ctx.drawImage(frame, containerInfo.coords.x, containerInfo.coords.y);
     }
   }
 
diff --git a/src/styles/index.scss b/src/styles/index.scss
index 87cda912b..9d05d5024 100644
--- a/src/styles/index.scss
+++ b/src/styles/index.scss
@@ -290,7 +290,7 @@ div[role="button"] {
   position: relative;
 }
 
-.shared-canvas {
+.shared-canvas, .absolute-video-container {
   position: absolute;
   top: 0;
   left: 0;
diff --git a/src/util/AbsoluteVideo.ts b/src/util/AbsoluteVideo.ts
new file mode 100644
index 000000000..cabbfd528
--- /dev/null
+++ b/src/util/AbsoluteVideo.ts
@@ -0,0 +1,71 @@
+import safePlay from './safePlay';
+
+type AbsoluteVideoOptions = {
+  position: { x: number; y: number };
+  noLoop?: boolean;
+  size: number;
+};
+
+export default class AbsoluteVideo {
+  private video?: HTMLVideoElement;
+
+  private isPlaying = false;
+
+  constructor(
+    videoUrl: string,
+    private container: HTMLElement,
+    private options: AbsoluteVideoOptions,
+  ) {
+    this.video = document.createElement('video');
+    this.video.src = videoUrl;
+    this.video.disablePictureInPicture = true;
+    this.video.muted = true;
+    this.video.style.position = 'absolute';
+    this.video.load();
+
+    if (!this.options.noLoop) {
+      this.video.loop = true;
+    }
+
+    this.container.appendChild(this.video);
+    this.recalculatePositionAndSize();
+  }
+
+  public play() {
+    if (this.isPlaying || !this.video) return;
+    this.recalculatePositionAndSize();
+    if (this.video.paused) {
+      safePlay(this.video);
+    }
+    this.isPlaying = true;
+  }
+
+  public pause() {
+    if (!this.isPlaying || !this.video) return;
+    if (!this.video.paused) {
+      this.video.pause();
+    }
+    this.isPlaying = false;
+  }
+
+  public destroy() {
+    this.pause();
+    this.video?.remove();
+    this.video = undefined;
+  }
+
+  public updatePosition(position: AbsoluteVideoOptions['position']) {
+    this.options.position = position;
+    this.recalculatePositionAndSize();
+  }
+
+  private recalculatePositionAndSize() {
+    if (!this.video) return;
+    const { size, position: { x, y } } = this.options;
+    const { width, height } = this.container.getBoundingClientRect();
+    this.video.style.left = `${Math.round(x * width)}px`;
+    this.video.style.top = `${Math.round(y * height)}px`;
+    this.video.style.width = `${size}px`;
+    this.video.style.height = `${size}px`;
+  }
+}
diff --git a/src/util/customEmojiManager.ts b/src/util/customEmojiManager.ts
index 5b962724f..46f9fc2e4 100644
--- a/src/util/customEmojiManager.ts
+++ b/src/util/customEmojiManager.ts
@@ -1,37 +1,124 @@
+import { addCallback } from '../lib/teact/teactn';
+import { getGlobal } from '../global';
+
 import { ApiMediaFormat } from '../api/types';
+import type { ApiSticker } from '../api/types';
+import type { GlobalState } from '../global/types';
 
 import { getStickerPreviewHash } from '../global/helpers';
-import { notifyCustomEmojiRender } from '../hooks/useEnsureCustomEmoji';
 import * as mediaLoader from './mediaLoader';
 import { throttle } from './schedulers';
+import generateIdFor from './generateIdFor';
+import { IS_WEBM_SUPPORTED } from './environment';
 
+import placeholderSrc from '../assets/square.svg';
+import blankSrc from '../assets/blank.png';
+
+type CustomEmojiLoadCallback = (customEmojis: GlobalState['customEmojis']) => void;
+type CustomEmojiInputRenderCallback = (emojiId: string) => void;
+
+const ID_STORE = {};
 const DOM_PROCESS_THROTTLE = 500;
 
+const INPUT_WAITING_CUSTOM_EMOJI_IDS: Set<string> = new Set();
+
+const handlers = new Map<CustomEmojiLoadCallback, string>();
+const renderHandlers = new Set<CustomEmojiInputRenderCallback>();
+
+let prevGlobal: GlobalState | undefined;
+
+addCallback((global: GlobalState) => {
+  if (global.customEmojis.byId !== prevGlobal?.customEmojis.byId) {
+    for (const entry of handlers) {
+      const [handler, id] = entry;
+      if (global.customEmojis.byId[id]) {
+        handler(global.customEmojis);
+      }
+    }
+
+    checkInputCustomEmojiLoad(global.customEmojis);
+  }
+
+  prevGlobal = global;
+});
+
+export function addCustomEmojiCallback(handler: CustomEmojiLoadCallback, emojiId: string) {
+  handlers.set(handler, emojiId);
+}
+
+export function removeCustomEmojiCallback(handler: CustomEmojiLoadCallback) {
+  handlers.delete(handler);
+}
+
+export function addCustomEmojiInputRenderCallback(handler: AnyToVoidFunction) {
+  renderHandlers.add(handler);
+}
+
+export function removeCustomEmojiInputRenderCallback(handler: AnyToVoidFunction) {
+  renderHandlers.delete(handler);
+}
+
+const callInputRenderHandlers = throttle((emojiId: string) => {
+  renderHandlers.forEach((handler) => handler(emojiId));
+}, DOM_PROCESS_THROTTLE);
+
 function processDomForCustomEmoji() {
   const emojis = document.querySelectorAll<HTMLImageElement>('.custom-emoji.placeholder');
   emojis.forEach((emoji) => {
-    const emojiId = emoji.dataset.documentId!;
-    const mediaHash = getStickerPreviewHash(emojiId);
-    const mediaData = mediaLoader.getFromMemory(mediaHash);
-    if (mediaData) {
-      emoji.src = mediaData;
-      emoji.classList.remove('placeholder');
+    const customEmoji = getGlobal().customEmojis.byId[emoji.dataset.documentId!];
+    if (!customEmoji) {
+      INPUT_WAITING_CUSTOM_EMOJI_IDS.add(emoji.dataset.documentId!);
+      return;
+    }
+    const [isPlaceholder, src, uniqueId] = getInputCustomEmojiParams(customEmoji);
 
-      notifyCustomEmojiRender(emojiId);
+    if (!isPlaceholder) {
+      emoji.src = src;
+      emoji.classList.remove('placeholder');
+      if (uniqueId) emoji.dataset.uniqueId = uniqueId;
+
+      callInputRenderHandlers(customEmoji.id);
     }
   });
 }
 
 export const processMessageInputForCustomEmoji = throttle(processDomForCustomEmoji, DOM_PROCESS_THROTTLE);
 
-export function getCustomEmojiPreviewMediaData(emojiId: string) {
-  const mediaHash = getStickerPreviewHash(emojiId);
+function checkInputCustomEmojiLoad(customEmojis: GlobalState['customEmojis']) {
+  const loaded = Array.from(INPUT_WAITING_CUSTOM_EMOJI_IDS).filter((id) => Boolean(customEmojis.byId[id]));
+  if (loaded.length) {
+    loaded.forEach((id) => INPUT_WAITING_CUSTOM_EMOJI_IDS.delete(id));
+    processMessageInputForCustomEmoji();
+  }
+}
+
+export function getCustomEmojiMediaDataForInput(emojiId: string, isPreview?: boolean) {
+  const mediaHash = isPreview ? getStickerPreviewHash(emojiId) : `sticker${emojiId}`;
   const data = mediaLoader.getFromMemory(mediaHash);
   if (data) {
-    notifyCustomEmojiRender(emojiId);
     return data;
   }
 
-  mediaLoader.fetch(mediaHash, ApiMediaFormat.BlobUrl).then(() => processMessageInputForCustomEmoji());
+  fetchAndProcess(mediaHash);
   return undefined;
 }
+
+function fetchAndProcess(mediaHash: string) {
+  return mediaLoader.fetch(mediaHash, ApiMediaFormat.BlobUrl).then(() => {
+    processMessageInputForCustomEmoji();
+  });
+}
+
+export function getInputCustomEmojiParams(customEmoji?: ApiSticker) {
+  if (!customEmoji) return [true, placeholderSrc, undefined];
+  const shouldUseStaticFallback = !IS_WEBM_SUPPORTED && customEmoji.isVideo;
+  const isUsingSharedCanvas = customEmoji.isLottie || (customEmoji.isVideo && !shouldUseStaticFallback);
+  if (isUsingSharedCanvas) {
+    fetchAndProcess(`sticker${customEmoji.id}`);
+    return [false, blankSrc, generateIdFor(ID_STORE, true)];
+  }
+
+  const mediaData = getCustomEmojiMediaDataForInput(customEmoji.id, shouldUseStaticFallback);
+
+  return [!mediaData, mediaData || placeholderSrc, undefined];
+}