From 6c56481932872e9a35030cf3e44f1a6f75f88c51 Mon Sep 17 00:00:00 2001
From: bob <bcz@cs.brown.edu>
Date: Thu, 3 Oct 2019 16:43:39 -0400
Subject: fixed docdecoration scrolling with pdfs.

---
 src/client/views/pdf/PDFViewer.tsx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/client/views/pdf/PDFViewer.tsx b/src/client/views/pdf/PDFViewer.tsx
index 9ff3e1bd1..1b76ddbdc 100644
--- a/src/client/views/pdf/PDFViewer.tsx
+++ b/src/client/views/pdf/PDFViewer.tsx
@@ -331,8 +331,10 @@ export class PDFViewer extends React.Component<IViewerProps> {
         }
     }
 
+    @observable scrollTop = 0;
     @action
     onScroll = (e: React.UIEvent<HTMLElement>) => {
+        this.scrollTop = this._mainCont.current!.scrollTop;
         this.pdfViewer && (this.props.Document.curPage = this.pdfViewer.currentPageNumber);
     }
 
@@ -607,7 +609,7 @@ export class PDFViewer extends React.Component<IViewerProps> {
         return true;
     }
     scrollXf = () => {
-        return this._mainCont.current ? this.props.ScreenToLocalTransform().translate(0, this._mainCont.current.scrollTop) : this.props.ScreenToLocalTransform();
+        return this._mainCont.current ? this.props.ScreenToLocalTransform().translate(0, this.scrollTop) : this.props.ScreenToLocalTransform();
     }
     setPreviewCursor = (func?: (x: number, y: number, drag: boolean) => void) => {
         this._setPreviewCursor = func;
-- 
cgit v1.2.3-70-g09d2