From 9579f92b6923f72375d98c4b95ccd3bbcc85ba75 Mon Sep 17 00:00:00 2001
From: Damien Zammit <damien@zamaudio.com>
Date: Thu, 31 Dec 2020 12:37:27 +1100
Subject: [PATCH] Make mousewheel delta independent of window size, fixes #95

---
 dgl/src/ImageWidgets.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dgl/src/ImageWidgets.cpp b/dgl/src/ImageWidgets.cpp
index de94ca02..94bf58a1 100644
--- a/dgl/src/ImageWidgets.cpp
+++ b/dgl/src/ImageWidgets.cpp
@@ -612,8 +612,9 @@ bool ImageKnob::onScroll(const ScrollEvent& ev)
     if (! contains(ev.pos))
         return false;
 
+    const float dir   = (ev.delta.getY() > 0.f) ? 1.f : -1.f;
     const float d     = (ev.mod & kModifierControl) ? 2000.0f : 200.0f;
-    float       value = (fUsingLog ? _invlogscale(fValueTmp) : fValueTmp) + (float(fMaximum - fMinimum) / d * 10.f * ev.delta.getY());
+    float       value = (fUsingLog ? _invlogscale(fValueTmp) : fValueTmp) + (float(fMaximum - fMinimum) / d * 10.f * dir);
 
     if (fUsingLog)
         value = _logscale(value);