Merge pull request #91 from crupest/scroll

Fix #90 .

1 files changed, 32 insertions, 1 deletions

diff --git a/Timeline/ClientApp/src/timeline/TimelinePageTemplateUI.tsx b/Timeline/ClientApp/src/timeline/TimelinePageTemplateUI.tsx
index 6d834832..1cd772c2 100644
--- a/Timeline/ClientApp/src/timeline/TimelinePageTemplateUI.tsx
+++ b/Timeline/ClientApp/src/timeline/TimelinePageTemplateUI.tsx
@@ -1,6 +1,7 @@
 import React from 'react';

 import { Spinner } from 'reactstrap';

 import { useTranslation } from 'react-i18next';

+import { Subject, fromEvent } from 'rxjs';

 

 import { getAlertHost } from '../common/alert-service';

 

@@ -67,6 +68,32 @@ export default function TimelinePageTemplateUI<
     }

   }, []);

 

+  const resizeSubject = React.useMemo(() => new Subject(), []);

+  const triggerResizeEvent = React.useCallback(() => {

+    resizeSubject.next(null);

+  }, [resizeSubject]);

+

+  React.useEffect(() => {

+    let scrollToBottom = true;

+    const disableScrollToBottom = (): void => {

+      scrollToBottom = false;

+    };

+

+    const subscriptions = [

+      fromEvent(window, 'wheel').subscribe(disableScrollToBottom),

+      fromEvent(window, 'pointerdown').subscribe(disableScrollToBottom),

+      resizeSubject.subscribe(() => {

+        if (scrollToBottom) {

+          window.scrollTo(0, document.body.scrollHeight);

+        }

+      }),

+    ];

+

+    return () => {

+      subscriptions.forEach((s) => s.unsubscribe());

+    };

+  }, [resizeSubject, timeline, props.posts]);

+

   const [cardHeight, setCardHeight] = React.useState<number>(0);

 

   const onCardHeightChange = React.useCallback((height: number) => {

@@ -104,7 +131,11 @@ export default function TimelinePageTemplateUI<
           );

         } else {

           timelineBody = (

-            <Timeline posts={props.posts} onDelete={props.onDelete} />

+            <Timeline

+              posts={props.posts}

+              onDelete={props.onDelete}

+              onResize={triggerResizeEvent}

+            />

           );

           if (props.onPost != null) {

             timelineBody = (