Gui: [skip ci] avoid that 3D view handles a single wheel scroll event…

… twice
FreeCAD · Apr 2, 2020 · 5324540 · 5324540
1 parent 7d18017
commit 5324540
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/src/Gui/Quarter/QuarterWidget.cpp b/src/Gui/Quarter/QuarterWidget.cpp
@@ -999,7 +999,13 @@ bool QuarterWidget::viewportEvent(QEvent* event)
         QMouseEvent* mouse = static_cast<QMouseEvent*>(event);
         QGraphicsItem *item = itemAt(mouse->pos());
         if (!item) {
-            QGraphicsView::viewportEvent(event);
+            bool ok = QGraphicsView::viewportEvent(event);
+            // Avoid that wheel events are handled twice
+            // https://forum.freecadweb.org/viewtopic.php?f=3&t=44822
+            if (event->type() == QEvent::Wheel) {
+                event->setAccepted(ok);
+                return ok;
+            }
             return false;
         }
     }