virtual scroll of chat room is implemented

projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts

@@ -7,7 +7,8 @@ import {
   Output,
   EventEmitter,
   Inject,
-  ChangeDetectorRef
+  ChangeDetectorRef,
+  ChangeDetectionStrategy
 } from '@angular/core';
 import {
   ucapAnimations,
@@ -133,7 +134,8 @@ import { FileProtocolService } from '@ucap-webmessenger/protocol-file';
   selector: 'app-layout-messenger-messages',
   templateUrl: './messages.component.html',
   styleUrls: ['./messages.component.scss'],
-  animations: ucapAnimations
+  animations: ucapAnimations,
+  changeDetection: ChangeDetectionStrategy.OnPush
 })
 export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
   @Output()
@@ -391,15 +393,15 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
         }
       });
 
-    this.interval = setInterval(() => {
     if (
       !!this.roomInfoSubject.value &&
       !!this.roomInfoSubject.value.isTimeRoom
     ) {
+      this.interval = setInterval(() => {
         this.store.dispatch(EventStore.infoIntervalClear({}));
-      }
       }, 1000);
     }
+  }
 
   ngOnDestroy(): void {
     if (!!this.loginResSubscription) {
@@ -424,8 +426,10 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
       this.searchEventListProcessingSubscription.unsubscribe();
     }
 
+    if (!!this.interval) {
       clearInterval(this.interval);
     }
+  }
 
   ngAfterViewInit(): void {
     // this.readyToReply();
@@ -1847,7 +1851,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
       this.eventRemainedSubject.value
     ) {
       this.moreSearchProcessing = true;
-      this.chatMessages.storeScrollHeight();
+      this.chatMessages.storeScrollPosition();
 
       // Case :: retrieve event infos step by step until include searchtext in event..
       this.store.dispatch(

projects/ucap-webmessenger-ui-chat/src/lib/components/message-box.component.ts

@@ -111,14 +111,14 @@ export class MessageBoxComponent implements OnInit, AfterViewInit {
   }
 
   ngAfterViewInit(): void {
-    this.logger.debug(
+    // this.logger.debug(
-      'offsetHeight' + this.message.seq,
+    //   'offsetHeight' + this.message.seq,
-      this.mbContainer.nativeElement.offsetHeight
+    //   this.mbContainer.nativeElement.offsetHeight
-    );
+    // );
-    this.elementRef.nativeElement.style.height = `${this.mbContainer
+    // this.elementRef.nativeElement.style.height = `${this.mbContainer
-      .nativeElement.offsetHeight + 20}px`;
+    //   .nativeElement.offsetHeight + 20}px`;
-    this.elementRef.nativeElement.style.maxHeight = `${this.mbContainer
+    // this.elementRef.nativeElement.style.maxHeight = `${this.mbContainer
-      .nativeElement.offsetHeight + 20}px`;
+    //   .nativeElement.offsetHeight + 20}px`;
     this.mbContainer.nativeElement.classList.remove('hide');
   }
 

projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.html

@@ -9,8 +9,14 @@
   (psYReachStart)="onYReachStart($event)"
   (psYReachEnd)="onYReachEnd($event)"
   [enableUnequalChildrenSizes]="true"
+  [modifyOverflowStyleOfParentScroll]="false"
+  (vsChange)="onVsChange($event)"
 >
-  <div class="chat-messages" [style.opacity]="fixScreen ? 0 : 1">
+  <div
+    #chatMessagesContainer
+    class="chat-messages hide"
+    [style.opacity]="fixScreen ? 0 : 1"
+  >
     <div
       *ngIf="eventRemained && eventList.length > 0"
       class="message-row view-previous"
@@ -51,17 +57,15 @@
     <!-- MESSAGE -->
     <div #container>
       <ucap-chat-message-box
-        *ngFor="
+        *ngFor="let message of scroll.viewPortItems; trackBy: trackByEvent"
-          let message of scroll.viewPortItems;
-          trackBy: trackByEvent;
-          let i = index
-        "
         [id]="message.seq"
         [message]="message"
         [mine]="message.senderSeq === loginRes.userSeq"
         [highlight]="isHighlightedEvent(message.seq)"
-        [existReadToHere]="getReadHere(i) && existReadHere && !clearReadHere"
+        [existReadToHere]="
-        [dateChanged]="getDateSplitter(i)"
+          getReadHere(message) && existReadHere && !clearReadHere
+        "
+        [dateChanged]="getDateSplitter(message)"
         [senderName]="getUserName(message.senderSeq)"
         [profileImageRoot]="profileImageRoot"
         [profileImage]="getUserProfile(message.senderSeq)"

projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.scss

@@ -185,3 +185,7 @@ $meBox-bg: #ffffff;
     }
   }
 }
+
+.hide {
+  opacity: 0 !important;
+}

projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.ts

@@ -6,8 +6,8 @@ import {
   Output,
   ViewChild,
   OnDestroy,
-  ElementRef,
+  ChangeDetectionStrategy,
-  Self
+  ElementRef
 } from '@angular/core';
 
 import {
@@ -28,12 +28,13 @@ import { FileDownloadItem } from '@ucap-webmessenger/api';
 import { TranslateService } from '@ngx-translate/core';
 import { PerfectScrollbarDirective } from 'ngx-perfect-scrollbar';
 import { Observable, Subscription } from 'rxjs';
-import { VirtualScrollerComponent } from 'ngx-virtual-scroller';
+import { VirtualScrollerComponent, IPageInfo } from 'ngx-virtual-scroller';
 
 @Component({
   selector: 'ucap-chat-messages',
   templateUrl: './messages.component.html',
-  styleUrls: ['./messages.component.scss']
+  styleUrls: ['./messages.component.scss'],
+  changeDetection: ChangeDetectionStrategy.OnPush
 })
 export class MessagesComponent implements OnInit, OnDestroy {
   @Input()
@@ -103,13 +104,16 @@ export class MessagesComponent implements OnInit, OnDestroy {
   @Output()
   existNewMessage = new EventEmitter<Info<EventJson>>();
 
+  @ViewChild('chatMessagesContainer', { static: false })
+  chatMessagesContainer: ElementRef<HTMLElement>;
+
   @ViewChild(PerfectScrollbarDirective, { static: false })
   psChatContent: PerfectScrollbarDirective;
 
   @ViewChild(VirtualScrollerComponent, { static: false })
   private virtualScroller: VirtualScrollerComponent;
 
-  storedScrollHeight = 0; // 이전대화를 불러올 경우 현재 스크롤 포지션 유지를 위한 값. 0 이면 초기로딩.
+  storedScrollItem: Info<EventJson>; // 이전대화를 불러올 경우 현재 스크롤 포지션 유지를 위한 값. 0 이면 초기로딩.
   scrollUpInitalized = false; // ps 에서 초기 로딩시 scroll reach start 이벤트 발생 버그를 우회하기 위한 init 값으로 scrollUp 에 의해 true 로 된다.
   firstCheckReadHere = true;
   initRoomLastEventSeq: number;
@@ -175,6 +179,8 @@ export class MessagesComponent implements OnInit, OnDestroy {
         this.firstCheckReadHere = false;
       }
 
+      this.eventList = eventList;
+
       if (this.searchingMode) {
         const baseseq = this.baseEventSeq;
         // setTimeout(() => {
@@ -187,8 +193,6 @@ export class MessagesComponent implements OnInit, OnDestroy {
           this.ready();
         }
       }
-
-      this.eventList = eventList;
     });
     this.newEventListSubscription = this.newEventList$.subscribe(
       newEventList => {
@@ -310,7 +314,9 @@ export class MessagesComponent implements OnInit, OnDestroy {
   }
 
   /** Date Splitter show check */
-  getDateSplitter(curIndex: number): boolean {
+  getDateSplitter(message: Info<EventJson>): boolean {
+    const curIndex = this.eventList.findIndex(v => v.seq === message.seq);
+
     if (curIndex === 0) {
       return true;
     }
@@ -318,21 +324,15 @@ export class MessagesComponent implements OnInit, OnDestroy {
       if (!this.eventList[curIndex]) {
         return false;
       }
-      return (
+      return !moment(this.eventList[curIndex].sendDate).isSame(
-        this.datePipe.transform(
+        moment(this.eventList[curIndex - 1].sendDate),
-          moment(this.eventList[curIndex].sendDate).toDate(),
+        'day'
-          'yyyyMMdd'
-        ) !==
-        this.datePipe.transform(
-          moment(this.eventList[curIndex - 1].sendDate).toDate(),
-          'yyyyMMdd'
-        )
       );
     }
     return false;
   }
 
-  getReadHere(messageIndex: number): boolean {
+  getReadHere(message: Info<EventJson>): boolean {
     if (
       !!this.roomInfo &&
       !!this.roomInfo.lastReadEventSeq &&
@@ -344,6 +344,10 @@ export class MessagesComponent implements OnInit, OnDestroy {
         this.roomInfo.roomType === RoomType.Multi
       ) {
         if (!this.roomInfo.isTimeRoom) {
+          const messageIndex = this.eventList.findIndex(
+            v => v.seq === message.seq
+          );
+
           if (
             this.eventList[messageIndex].seq ===
             this.roomInfo.lastReadEventSeq + 1
@@ -365,20 +369,39 @@ export class MessagesComponent implements OnInit, OnDestroy {
     return rtnStr;
   }
 
-  storeScrollHeight() {
+  storeScrollPosition() {
-    this.storedScrollHeight = this.psChatContent.elementRef.nativeElement.scrollHeight;
+    this.storedScrollItem = this.eventList[
+      this.virtualScroller.viewPortInfo.startIndex
+    ];
+  }
+
+  scrollToStoredItem() {
+    if (!this.scrollUpInitalized) {
+      this.chatMessagesContainer.nativeElement.classList.remove('hide');
+    }
+
+    this.virtualScroller.scrollInto(this.storedScrollItem, true, 0, 0, () => {
+      this.storedScrollItem = undefined;
+    });
   }
 
   ready(): void {
+    if (!this.scrollUpInitalized) {
+      this.chatMessagesContainer.nativeElement.classList.add('hide');
+    }
+
     setTimeout(() => {
       this.scrollToBottom();
+      // setTimeout(() => {
+      //   this.chatMessagesContainer.nativeElement.classList.remove('hide');
+      // }, 100);
     });
   }
 
   scrollToBottom(speed?: number): void {
-    if (this.storedScrollHeight > 0) {
+    if (!!this.storedScrollItem) {
-      if (this.psChatContent) {
+      // if (this.psChatContent) {
-        this.psChatContent.update();
+      //   this.psChatContent.update();
 
       const element = document.getElementById('message-box-readhere');
       if (!!element && this.firstCheckReadHere) {
@@ -388,17 +411,9 @@ export class MessagesComponent implements OnInit, OnDestroy {
 
         this.firstCheckReadHere = false;
       } else {
-          setTimeout(() => {
+        this.scrollToStoredItem();
-            this.psChatContent.scrollToTop(
-              this.psChatContent.elementRef.nativeElement.scrollHeight -
-                this.storedScrollHeight,
-              speed
-            );
-
-            this.storedScrollHeight = 0;
-          });
-        }
       }
+      // }
     } else if (this.scrollUpInitalized) {
       if (!!this.newEventList && this.newEventList.length > 0) {
         this.existNewMessage.emit(
@@ -418,9 +433,23 @@ export class MessagesComponent implements OnInit, OnDestroy {
 
           this.firstCheckReadHere = false;
         } else {
-          setTimeout(() => {
+          this.virtualScroller.scrollInto(
-            this.psChatContent.scrollToBottom(0, speed);
+            this.eventList[this.eventList.length - 1],
-          });
+            true,
+            0,
+            0,
+            () => {
+              if (!this.scrollUpInitalized) {
+                this.chatMessagesContainer.nativeElement.classList.remove(
+                  'hide'
+                );
+              }
+            }
+          );
+
+          // setTimeout(() => {
+          //   this.psChatContent.scrollToBottom(0, speed);
+          // });
         }
       }
     }
@@ -429,7 +458,7 @@ export class MessagesComponent implements OnInit, OnDestroy {
   initEventMore() {
     // 방정보가 바뀌면 이전대화 보기 관련 값들을 초기화 한다.
     this.scrollUpInitalized = false;
-    this.storedScrollHeight = 0;
+    this.storedScrollItem = undefined;
   }
 
   clear() {}
@@ -464,9 +493,12 @@ export class MessagesComponent implements OnInit, OnDestroy {
     event.stopPropagation();
 
     if (this.scrollUpInitalized && this.eventRemained) {
-      this.storedScrollHeight = this.psChatContent.elementRef.nativeElement.scrollHeight;
+      // this.storedScrollItem = this.psChatContent.elementRef.nativeElement.scrollHeight;
+      this.storeScrollPosition();
 
       this.moreEvent.emit(this.eventList[0].seq);
+
+      this.virtualScroller.invalidateCachedMeasurementAtIndex(0);
     }
   }
 
@@ -506,6 +538,9 @@ export class MessagesComponent implements OnInit, OnDestroy {
   }
 
   onScrollup(event: any) {
+    if (!this.eventList || 0 === this.eventList.length) {
+      return;
+    }
     this.scrollUpInitalized = true;
     this.scrollUp.emit(event);
   }
@@ -516,6 +551,17 @@ export class MessagesComponent implements OnInit, OnDestroy {
     this.yReachEnd.emit(event);
   }
 
+  onVsChange(event: IPageInfo) {
+    if (
+      -1 === event.startIndex ||
+      -1 === event.endIndex ||
+      (0 === event.startIndex && 0 === event.endIndex)
+    ) {
+      return;
+    }
+    this.logger.debug('onVsChange', event);
+  }
+
   trackByEvent(index: number, info: Info<EventJson>): number {
     return info.seq;
   }