Implement #746

src/calibre/gui2/cover_flow.py

@@ -74,6 +74,14 @@ if pictureflow is not None:
             self.setFocusPolicy(Qt.WheelFocus)
             self.setSizePolicy(QSizePolicy(QSizePolicy.MinimumExpanding, QSizePolicy.Minimum))
             
+        def wheelEvent(self, ev):
+            ev.accept()
+            if ev.delta() > 0:
+                self.showNext()
+            elif ev.delta() < 0:
+                self.showPrevious()
+            
+        
 else:
     CoverFlow = None
     DatabaseImages = None

src/calibre/gui2/pictureflow/pictureflow.cpp

@@ -1347,7 +1347,6 @@ void PictureFlow::mouseReleaseEvent(QMouseEvent* event)
   emit inputReceived();
 }
 
-
 void PictureFlow::paintEvent(QPaintEvent* event)
 {
   Q_UNUSED(event);