From: Sylvain Munaut <redacted>
Date: Sun, 28 May 2017 14:53:27 +0000 (+0200)
Subject: viewport: Allow smoother zoom using vertical scroll events
X-Git-Tag: pulseview-0.4.0~66
X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=commitdiff_plain;h=3592f4053b1b9d96869ccfb88a09a1d493ee253f

viewport: Allow smoother zoom using vertical scroll events

The zoom supports 'double' as input type but since delta() and 120 are
integer, this wasn't used and any event with a delta lower than 120 was
ignored.

With this mod, the zoom level changes are _much_ smoother on trackpads

Signed-off-by: Sylvain Munaut <redacted>
---

diff --git a/pv/view/viewport.cpp b/pv/view/viewport.cpp
index a179cef1..70282d29 100644
--- a/pv/view/viewport.cpp
+++ b/pv/view/viewport.cpp
@@ -210,7 +210,7 @@ void Viewport::wheelEvent(QWheelEvent *event)
 				(event->delta() * height()) / (8 * 120));
 		} else {
 			// Vertical scrolling is interpreted as zooming in/out
-			view_.zoom(event->delta() / 120, event->x());
+			view_.zoom(event->delta() / 120.0, event->x());
 		}
 	} else if (event->orientation() == Qt::Horizontal) {
 		// Horizontal scrolling is interpreted as moving left/right