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changeset 878:241688360929

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Discard wildly excessive wheel events
author Chris Cannam
date Mon, 10 Nov 2014 09:54:09 +0000
parents d854c72dcaa1
children 899c4d7e7e63 33157c3f0e80
files view/Pane.cpp
diffstat 1 files changed, 7 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/view/Pane.cpp	Fri Oct 03 15:27:02 2014 +0100
+++ b/view/Pane.cpp	Mon Nov 10 09:54:09 2014 +0000
@@ -2286,6 +2286,13 @@
         // Coarse wheel information (or vertical zoom, which is
         // necessarily coarse itself)
 
+        // Sometimes on Linux we're seeing absurdly extreme angles on
+        // the first wheel event -- discard those entirely
+        if (abs(m_pendingWheelAngle) > 1000) {
+            m_pendingWheelAngle = 0;
+            return;
+        }
+        
         while (abs(m_pendingWheelAngle) >= 120) {
 
             int sign = (m_pendingWheelAngle < 0 ? -1 : 1);