bug fixed

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

@@ -425,7 +425,6 @@ export class MessagesComponent implements OnInit, OnDestroy {
     useSwap: boolean,
     addtionalOffset?: number
   ) {
-    if (!!to) {
     this.preSwapScroll(useHide, useSwap);
     if (!!preCallback) {
       preCallback();
@@ -449,15 +448,6 @@ export class MessagesComponent implements OnInit, OnDestroy {
         });
       }
     );
-    } else {
-      if (!!preCallback) {
-        preCallback();
-      }
-
-      if (!!postCallback) {
-        postCallback();
-      }
-    }
   }
 
   preSwapScroll(useHide: boolean, useSwap: boolean) {
@@ -540,6 +530,12 @@ export class MessagesComponent implements OnInit, OnDestroy {
           return;
         }
 
+        if (!!this.gotoEventSeq) {
+          this.gotoPosition(this.gotoEventSeq);
+          this.gotoEventSeq = undefined;
+          return;
+        }
+
         const lastEvent =
           !!this.eventList && 0 < this.eventList.length
             ? this.eventList[this.eventList.length - 1]
@@ -550,20 +546,14 @@ export class MessagesComponent implements OnInit, OnDestroy {
         }
         const isInViewPortItems = this.isInViewPortItems(lastEvent.seq);
         this.swapScrollTo(
-          !!this.gotoEventSeq
-            ? undefined
-            : this.eventList[this.eventList.length - 1],
+          this.eventList[this.eventList.length - 1],
           () => {},
           () => {
             this.initalized = true;
-            if (!!this.gotoEventSeq) {
-              this.gotoPosition(this.gotoEventSeq);
-              this.gotoEventSeq = undefined;
-            }
           },
           -1 === this.virtualScroller.viewPortInfo.endIndex ||
             !isInViewPortItems,
-          !isInViewPortItems || !!this.gotoEventSeq
+          !isInViewPortItems
         );
       }
     }