Batch reactions update

src/components/chat/bubbles.ts

@@ -207,6 +207,8 @@ export default class ChatBubbles {
   private hoverBubble: HTMLElement;
   private hoverReaction: HTMLElement;
 
+  private onUpdateScrollSaver: ScrollSaver;
+
   // private reactions: Map<number, ReactionsElement>;
 
   constructor(
@@ -428,10 +430,8 @@ export default class ChatBubbles {
 
         const updatePosition = this.chat.type === 'scheduled';
         
-        const scrollSaver = new ScrollSaver(this.scrollable, true);
+        this.saveOnUpdateScroll();
-        scrollSaver.save();
         this.safeRenderMessage(mounted.message, true, false, mounted.bubble, updatePosition);
-        scrollSaver.restore();
 
         if(updatePosition) {
           (this.messagesQueuePromise || Promise.resolve()).then(() => {
@@ -465,13 +465,12 @@ export default class ChatBubbles {
           return;
         }
 
-        const scrollSaver = new ScrollSaver(this.scrollable, true);
         const bubble = this.getBubbleByMessage(message);
         if(!bubble) {
           return;
         }
 
-        scrollSaver.save();
+        this.saveOnUpdateScroll();
 
         const key = message.peerId + '_' + message.mid;
         const set = REACTIONS_ELEMENTS.get(key);
@@ -482,8 +481,6 @@ export default class ChatBubbles {
         } else {
           rootScope.dispatchEvent('missed_reactions_element', {message, changedResults});
         }
-
-        scrollSaver.restore();
       });
     }
 
@@ -775,6 +772,7 @@ export default class ChatBubbles {
           let different = false;
           postViewsElements.forEach(postViews => {
             if(different || postViews.innerHTML !== str) {
+              this.saveOnUpdateScroll();
               different = true;
               postViews.innerHTML = str;
             }
@@ -922,6 +920,18 @@ export default class ChatBubbles {
     }
   }
 
+  private saveOnUpdateScroll() {
+    if(!this.onUpdateScrollSaver) {
+      this.onUpdateScrollSaver = new ScrollSaver(this.scrollable, true);
+      setTimeout(() => {
+        this.onUpdateScrollSaver.restore();
+        this.onUpdateScrollSaver = undefined;
+      }, 0);
+
+      this.onUpdateScrollSaver.save();
+    }
+  }
+
   private onBubblesMouseMove = (e: MouseEvent) => {
     const content = findUpClassName(e.target, 'bubble-content');
     if(content && !this.chat.selection.isSelecting) {
@@ -3904,7 +3914,7 @@ export default class ChatBubbles {
     }
 
     if(scrollSaver) {
-      scrollSaver.restore();
+      scrollSaver.restore(history.length === 1 && !reverse ? false : true);
     }
 
     return true;

src/helpers/scrollSaver.ts

@@ -9,6 +9,7 @@ import { IS_SAFARI } from "../environment/userAgent";
 import reflowScrollableElement from "./dom/reflowScrollableElement";
 
 export default class ScrollSaver {
+  private previousScrollHeight: number;
   private previousScrollHeightMinusTop: number/* , previousScrollHeight: number */;
 
   /**
@@ -16,7 +17,10 @@ export default class ScrollSaver {
    * @param scrollable to reset scroll position and direction
    * @param reverse true means top
    */
-  constructor(private scrollable: Scrollable, private reverse: boolean) {
+  constructor(
+    private scrollable: Scrollable, 
+    private reverse: boolean
+  ) {
 
   }
 
@@ -29,6 +33,7 @@ export default class ScrollSaver {
 
     //previousScrollHeight = scrollHeight;
     //previousScrollHeight = scrollHeight + padding;
+    this.previousScrollHeight = scrollHeight;
     this.previousScrollHeightMinusTop = this.reverse ? scrollHeight - scrollTop : scrollTop;
 
     //this.chatInner.style.paddingTop = padding + 'px';
@@ -43,14 +48,19 @@ export default class ScrollSaver {
     } */
   }
 
-  public restore() {
+  public restore(useReflow?: boolean) {
     const {container, previousScrollHeightMinusTop, scrollable} = this;
     if(previousScrollHeightMinusTop !== undefined) {
+      const scrollHeight = container.scrollHeight;
+      if(scrollHeight === this.previousScrollHeight) {
+        return;
+      }
+
       /* const scrollHeight = container.scrollHeight;
       const addedHeight = scrollHeight - previousScrollHeight;
       
       this.chatInner.style.paddingTop = (10000 - addedHeight) + 'px'; */
-      /* const scrollHeight = container.scrollHeight;
+      /* const scrollHeight = scrollHeight;
       const addedHeight = scrollHeight - previousScrollHeight;
       
       this.chatInner.style.paddingTop = (padding - addedHeight) + 'px';
@@ -58,10 +68,10 @@ export default class ScrollSaver {
       //const newScrollTop = reverse ? scrollHeight - previousScrollHeightMinusTop : previousScrollHeightMinusTop;
       const newScrollTop = reverse ? scrollHeight - addedHeight - previousScrollHeightMinusTop : previousScrollHeightMinusTop;
       this.log('performHistoryResult: will set scrollTop', 
-      previousScrollHeightMinusTop, container.scrollHeight, 
+      previousScrollHeightMinusTop, scrollHeight, 
       newScrollTop, container.container.clientHeight); */
       //const newScrollTop = reverse ? scrollHeight - previousScrollHeightMinusTop : previousScrollHeightMinusTop;
-      const newScrollTop = this.reverse ? container.scrollHeight - previousScrollHeightMinusTop : previousScrollHeightMinusTop;
+      const newScrollTop = this.reverse ? scrollHeight - previousScrollHeightMinusTop : previousScrollHeightMinusTop;
       
       /* if(DEBUG) {
         this.log('performHistoryResult: will set up scrollTop:', newScrollTop, this.isHeavyAnimationInProgress);
@@ -70,13 +80,13 @@ export default class ScrollSaver {
       // touchSupport for safari iOS
       //isTouchSupported && isApple && (container.container.style.overflow = 'hidden');
       container.scrollTop = newScrollTop;
-      //container.scrollTop = container.scrollHeight;
+      //container.scrollTop = scrollHeight;
       //isTouchSupported && isApple && (container.container.style.overflow = '');
 
       scrollable.lastScrollPosition = newScrollTop;
       // scrollable.lastScrollDirection = 0;
 
-      if(IS_SAFARI/*  && !isAppleMobile */) { // * fix blinking and jumping
+      if(IS_SAFARI && useReflow/*  && !isAppleMobile */) { // * fix blinking and jumping
         reflowScrollableElement(container);
       }