Some software (notably Gimp and Inkscape) allows horizontal scrolling
with the vertical wheel when the shift key is pressed. Implement this
behaviour for easier navigation with single wheel mice.
---
pv/views/trace/viewport.cpp | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/pv/views/trace/viewport.cpp b/pv/views/trace/viewport.cpp
index a2d0b99a..67ee623c 100644
--- a/pv/views/trace/viewport.cpp
+++ b/pv/views/trace/viewport.cpp
@@ -231,6 +231,12 @@ void Viewport::wheelEvent(QWheelEvent *event)
// is intrepretted as vertical scrolling
view_.set_v_offset(-view_.owner_visual_v_offset() -
(event->delta() * height()) / (8 * 120));
+ } else if (event->modifiers() & Qt::ShiftModifier) {
+ // Vertical scrolling with the shift key pressed
+ // acts as horizontal scrolling like in Gimp
+ // and Inkscape.
+ view_.set_scale_offset(view_.scale(),
+ -event->delta() * view_.scale() +
view_.offset());
} else {
// Vertical scrolling is interpreted as zooming in/out
view_.zoom(event->delta() / 120.0, event->x());
--
2.20.1
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