From d1959f141a777397bd5eeb5d40bcfe7195538557 Mon Sep 17 00:00:00 2001
From: bobzel <zzzman@gmail.com>
Date: Mon, 12 Oct 2020 10:23:29 -0400
Subject: fixed computedFn()'s to be used correctly in several places. fixed
 major memory leak in PDFs

---
 src/client/views/nodes/PDFBox.tsx | 31 ++++++++++++++++++-------------
 1 file changed, 18 insertions(+), 13 deletions(-)

(limited to 'src/client/views/nodes/PDFBox.tsx')

diff --git a/src/client/views/nodes/PDFBox.tsx b/src/client/views/nodes/PDFBox.tsx
index 74b431bea..79e00eed7 100644
--- a/src/client/views/nodes/PDFBox.tsx
+++ b/src/client/views/nodes/PDFBox.tsx
@@ -35,7 +35,7 @@ export class PDFBox extends ViewBoxAnnotatableComponent<FieldViewProps, PdfDocum
     private _scriptValue: string = "";
     private _searchString: string = "";
     private _initialScale: number = 0;  // the initial scale of the PDF when first rendered which determines whether the document will be live on startup or not.  Getting bigger after startup won't make it automatically be live.
-    private _everActive = false; // has this box ever had its contents activated -- if so, stop drawing the overlay title
+    private _displayPdfLive = false; // has this box ever had its contents activated -- if so, stop drawing the overlay title
     private _pdfViewer: PDFViewer | undefined;
     private _searchRef = React.createRef<HTMLInputElement>();
     private _keyRef = React.createRef<HTMLInputElement>();
@@ -44,7 +44,6 @@ export class PDFBox extends ViewBoxAnnotatableComponent<FieldViewProps, PdfDocum
     private _selectReactionDisposer: IReactionDisposer | undefined;
 
     @observable private _searching: boolean = false;
-    @observable private _flyout: boolean = false;
     @observable private _pdf: Opt<Pdfjs.PDFDocumentProxy>;
     @observable private _pageControls = false;
 
@@ -54,6 +53,11 @@ export class PDFBox extends ViewBoxAnnotatableComponent<FieldViewProps, PdfDocum
         const nw = this.Document._nativeWidth = NumCast(this.dataDoc[this.props.fieldKey + "-nativeWidth"], NumCast(this.Document._nativeWidth, 927));
         const nh = this.Document._nativeHeight = NumCast(this.dataDoc[this.props.fieldKey + "-nativeHeight"], NumCast(this.Document._nativeHeight, 1200));
         !this.Document._fitWidth && (this.Document._height = this.Document[WidthSym]() * (nh / nw));
+        const pdfUrl = Cast(this.dataDoc[this.props.fieldKey], PdfField);
+        if (pdfUrl) {
+            if (PDFBox.pdfcache.get(pdfUrl.url.href)) runInAction(() => this._pdf = PDFBox.pdfcache.get(pdfUrl.url.href));
+            else if (PDFBox.pdfpromise.get(pdfUrl.url.href)) PDFBox.pdfpromise.get(pdfUrl.url.href)?.then(action(pdf => this._pdf = pdf));
+        }
 
         const backup = "oldPath";
         const { Document } = this.props;
@@ -265,22 +269,23 @@ export class PDFBox extends ViewBoxAnnotatableComponent<FieldViewProps, PdfDocum
         </div>;
     }
 
-    _pdfjsRequested = false;
+    static pdfcache = new Map<string, Pdfjs.PDFDocumentProxy>();
+    static pdfpromise = new Map<string, Pdfjs.PDFPromise<Pdfjs.PDFDocumentProxy>>();
     render() {
         TraceMobx();
-        const pdfUrl = Cast(this.dataDoc[this.props.fieldKey], PdfField, null);
         if (true) {//this.props.isSelected() || (this.props.active() && this.props.renderDepth === 0) || this.props.Document._scrollY !== undefined) {
-            this._everActive = true;
+            this._displayPdfLive = true;
         }
-        if (pdfUrl && this._everActive) {
-            if (pdfUrl instanceof PdfField && this._pdf) {
-                return this.renderPdfView;
-            }
-            if (!this._pdfjsRequested) {
-                this._pdfjsRequested = true;
-                const promise = Pdfjs.getDocument(pdfUrl.url.href).promise;
-                promise.then(action(pdf => this._pdf = pdf));
+        if (this._displayPdfLive) {
+            if (this._pdf) return this.renderPdfView;
 
+            const href = Cast(this.dataDoc[this.props.fieldKey], PdfField, null)?.url.href;
+            if (href) {
+                if (PDFBox.pdfcache.get(href)) setTimeout(action(() => this._pdf = PDFBox.pdfcache.get(href)));
+                else {
+                    if (!PDFBox.pdfpromise.get(href)) PDFBox.pdfpromise.set(href, Pdfjs.getDocument(href).promise);
+                    PDFBox.pdfpromise.get(href)?.then(action(pdf => PDFBox.pdfcache.set(href, this._pdf = pdf)));
+                }
             }
         }
         return this.renderTitleBox;
-- 
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