X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=pv%2Fview%2Fviewport.cpp;h=90f2b4b2a5a922d63a7931e47d9482c621f4d088;hb=238404062db14998f3b0ca93ae03a47543d219b8;hp=03b07fdf13351d3ceab1e8720af701f503046335;hpb=3868e5fa3081573891ff2ae5b9dd67eb4a6afa4b;p=pulseview.git

diff --git a/pv/view/viewport.cpp b/pv/view/viewport.cpp
index 03b07fdf..90f2b4b2 100644
--- a/pv/view/viewport.cpp
+++ b/pv/view/viewport.cpp
@@ -98,7 +98,7 @@ void Viewport::mouseMoveEvent(QMouseEvent *event)
 {
 	assert(event);
 
-	if(event->buttons() & Qt::LeftButton)
+	if (event->buttons() & Qt::LeftButton)
 	{
 		_view.set_scale_offset(_view.scale(),
 			_mouse_down_offset +
@@ -115,12 +115,21 @@ void Viewport::mouseReleaseEvent(QMouseEvent *event)
 void Viewport::wheelEvent(QWheelEvent *event)
 {
 	assert(event);
-	_view.zoom(event->delta() / 120, event->x());
+
+	if (event->orientation() == Qt::Vertical) {
+		// Vertical scrolling is interpreted as zooming in/out
+		_view.zoom(event->delta() / 120, event->x());
+	} else if (event->orientation() == Qt::Horizontal) {
+		// Horizontal scrolling is interpreted as moving left/right
+		_view.set_scale_offset(_view.scale(),
+				       event->delta() * _view.scale()
+				       + _view.offset());
+	}
 }
 
 void Viewport::draw_cursors_background(QPainter &p)
 {
-	if(!_view.cursors_shown())
+	if (!_view.cursors_shown())
 		return;
 
 	p.setPen(Qt::NoPen);
@@ -137,7 +146,7 @@ void Viewport::draw_cursors_background(QPainter &p)
 
 void Viewport::draw_cursors_foreground(QPainter &p)
 {
-	if(!_view.cursors_shown())
+	if (!_view.cursors_shown())
 		return;
 
 	const QRect r = rect();