From 02ed26221e6a87ac1fe534f91e4acbd45ae1e7ad Mon Sep 17 00:00:00 2001
From: David <33458145+davidmcpowell@users.noreply.github.com>
Date: Mon, 13 Jan 2025 13:32:10 +0000
Subject: [PATCH] Merge pull request #22756 from
 overleaf/dp-preload-pdf-presentation

Load full pdf document in background when entering presentation mode

GitOrigin-RevId: 514ef838b155a7f13f3bc12690aef45fd3f2c3fc
---
 .../js/features/pdf-preview/hooks/use-presentation-mode.ts    | 2 ++
 .../frontend/js/features/pdf-preview/util/pdf-js-wrapper.ts   | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/services/web/frontend/js/features/pdf-preview/hooks/use-presentation-mode.ts b/services/web/frontend/js/features/pdf-preview/hooks/use-presentation-mode.ts
index 3b4a9be364..7c76c6b17d 100644
--- a/services/web/frontend/js/features/pdf-preview/hooks/use-presentation-mode.ts
+++ b/services/web/frontend/js/features/pdf-preview/hooks/use-presentation-mode.ts
@@ -133,6 +133,8 @@ export default function usePresentationMode(
       pdfJsWrapper.viewer.scrollMode = 3 // page
       pdfJsWrapper.viewer.spreadMode = 0 // none
 
+      pdfJsWrapper.fetchAllData()
+
       setPresentationMode(true)
     }
   }, [pdfJsWrapper, setScale, scale])
diff --git a/services/web/frontend/js/features/pdf-preview/util/pdf-js-wrapper.ts b/services/web/frontend/js/features/pdf-preview/util/pdf-js-wrapper.ts
index ca1ff2ea0e..7053342e73 100644
--- a/services/web/frontend/js/features/pdf-preview/util/pdf-js-wrapper.ts
+++ b/services/web/frontend/js/features/pdf-preview/util/pdf-js-wrapper.ts
@@ -99,6 +99,10 @@ export default class PDFJSWrapper {
     }
   }
 
+  async fetchAllData() {
+    await this.viewer.pdfDocument?.getData()
+  }
+
   // update the current scale value if the container size changes
   updateOnResize() {
     if (!this.isVisible()) {