From e601519157beb9ef50f2a755f15ceebb02e2545b Mon Sep 17 00:00:00 2001
From: Matthew Petroff <matthew@mpetroff.net>
Date: Sat, 13 Feb 2021 11:14:59 -0500
Subject: [PATCH] Disable `ctrl` / `shift` zoom when `ctrl` is required for
 mouse wheel zoom.

---
 doc/json-config-parameters.md | 3 ++-
 src/js/pannellum.js           | 4 ++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/doc/json-config-parameters.md b/doc/json-config-parameters.md
index 4e887a1..b4e1c58 100644
--- a/doc/json-config-parameters.md
+++ b/doc/json-config-parameters.md
@@ -101,7 +101,8 @@ If set to `false`, zooming with mouse wheel will be disabled. Defaults to `true`
 Can also be set to `fullscreenonly`, in which case it is only enabled when the
 viewer is fullscreen. Can also be set to `ctrl`, in which case the `ctrl` key
 must be held down to zoom with the mouse wheel (except while the viewer is
-fullscreen).
+fullscreen); when the `ctrl` key is required for mouse wheel zooming, the use
+of `ctrl` / `shift` for zoom control is disabled.
 
 
 ### `doubleClickZoom` (boolean)
diff --git a/src/js/pannellum.js b/src/js/pannellum.js
index b2c2060..92da510 100644
--- a/src/js/pannellum.js
+++ b/src/js/pannellum.js
@@ -1177,6 +1177,10 @@ function onDocumentKeyPress(event) {
     // Override default action for keys that are used
     if (config.capturedKeyNumbers.indexOf(keynumber) < 0)
         return;
+    if (!fullscreenActive && (keynumber == 16 || keynumber == 17) && config.mouseZoom == 'ctrl')
+        // Disable ctrl / shift zoom when holding the ctrl key is required for
+        // scroll wheel zooming
+        return;
     event.preventDefault();
     
     // If escape key is pressed