From a1f4bff4f38b92df34ede30a5cbb3f54f39ee5ad Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Wed, 15 Oct 2014 22:03:13 +0200
Subject: [PATCH] Disable zooming in Presentation Mode

---
 web/viewer.js | 34 +++++++++++++++++++++++-----------
 1 file changed, 23 insertions(+), 11 deletions(-)

diff --git a/web/viewer.js b/web/viewer.js
index 95614693d..3a86c3dcf 100644
--- a/web/viewer.js
+++ b/web/viewer.js
@@ -1964,11 +1964,12 @@ function handleMouseWheel(evt) {
               evt.wheelDelta / MOUSE_WHEEL_DELTA_FACTOR;
   var direction = (ticks < 0) ? 'zoomOut' : 'zoomIn';
 
-  if (evt.ctrlKey) { // Only zoom the pages, not the entire viewer
+  if (PresentationMode.active) {
+    evt.preventDefault();
+    PDFViewerApplication.mouseScroll(ticks * MOUSE_WHEEL_DELTA_FACTOR);
+  } else if (evt.ctrlKey) { // Only zoom the pages, not the entire viewer
     evt.preventDefault();
     PDFViewerApplication[direction](Math.abs(ticks));
-  } else if (PresentationMode.active) {
-    PDFViewerApplication.mouseScroll(ticks * MOUSE_WHEEL_DELTA_FACTOR);
   }
 }
 
@@ -2003,6 +2004,11 @@ window.addEventListener('keydown', function keydown(evt) {
   // control is selected or not.
   if (cmd === 1 || cmd === 8 || cmd === 5 || cmd === 12) {
     // either CTRL or META key with optional SHIFT.
+    var pdfViewer = PDFViewerApplication.pdfViewer;
+    var inPresentationMode =
+      pdfViewer.presentationModeState === PresentationModeState.CHANGING ||
+      pdfViewer.presentationModeState === PresentationModeState.FULLSCREEN;
+
     switch (evt.keyCode) {
       case 70: // f
         if (!PDFViewerApplication.supportsIntegratedFind) {
@@ -2021,23 +2027,29 @@ window.addEventListener('keydown', function keydown(evt) {
       case 107: // FF '+' and '='
       case 187: // Chrome '+'
       case 171: // FF with German keyboard
-        PDFViewerApplication.zoomIn();
+        if (!inPresentationMode) {
+          PDFViewerApplication.zoomIn();
+        }
         handled = true;
         break;
       case 173: // FF/Mac '-'
       case 109: // FF '-'
       case 189: // Chrome '-'
-        PDFViewerApplication.zoomOut();
+        if (!inPresentationMode) {
+          PDFViewerApplication.zoomOut();
+        }
         handled = true;
         break;
       case 48: // '0'
       case 96: // '0' on Numpad of Swedish keyboard
-        // keeping it unhandled (to restore page zoom to 100%)
-        setTimeout(function () {
-          // ... and resetting the scale after browser adjusts its scale
-          PDFViewerApplication.setScale(DEFAULT_SCALE, true);
-        });
-        handled = false;
+        if (!inPresentationMode) {
+          // keeping it unhandled (to restore page zoom to 100%)
+          setTimeout(function () {
+            // ... and resetting the scale after browser adjusts its scale
+            PDFViewerApplication.setScale(DEFAULT_SCALE, true);
+          });
+          handled = false;
+        }
         break;
     }
   }