From e69cdfb88dd6dbacb9cf95bedd2dc765347a0cb0 Mon Sep 17 00:00:00 2001
From: Jacopo De Simoi <jacopods@gmail.com>
Date: Tue, 18 Oct 2016 12:49:39 -0400
Subject: [PATCH] Use pixel events for smooth zooming

---
 ui/pageview.cpp | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/ui/pageview.cpp b/ui/pageview.cpp
index 61dd1cec0..9ef2e0b33 100644
--- a/ui/pageview.cpp
+++ b/ui/pageview.cpp
@@ -3300,17 +3300,11 @@ void PageView::wheelEvent( QWheelEvent *e )
         vScroll = verticalScrollBar()->value();
     e->accept();
     if ( (e->modifiers() & Qt::ControlModifier) == Qt::ControlModifier ) {
-        d->controlWheelAccumulatedDelta += delta;
-        if ( d->controlWheelAccumulatedDelta <= -QWheelEvent::DefaultDeltasPerStep )
-        {
-            slotZoomOut();
-            d->controlWheelAccumulatedDelta = 0;
-        }
-        else if ( d->controlWheelAccumulatedDelta >= QWheelEvent::DefaultDeltasPerStep )
-        {
-            slotZoomIn();
-            d->controlWheelAccumulatedDelta = 0;
-        }
+        d->zoomFactor *= exp( (double)delta / 120.0 );
+        d->blockPixmapsRequest = true;
+        updateZoom( ZoomRefreshCurrent );
+        d->blockPixmapsRequest = false;
+        viewport()->repaint();
     }
     else
     {