private void handleInZoomMode(final MouseWheelEvent event) {
    zoom(event, event.getUnitsToScroll() > 0, event.isShiftDown());
  }
Listens to mouse wheel events in edit mode.
java/zylib/src/main/java/com/google/security/zynamics/zylib/yfileswrap/gui/zygraph/editmode/ZyEditModeMouseWheelListener.java