Method onMenuZoomOut

YUViewLib/src/ui/Mainwindow.h:103–108

      v->zoomIn(checked);
  }
  void onMenuZoomOut(bool checked)
  {
    const auto v = this->getCurrentActiveView();
    if (v)
      v->zoomOut(checked);
  }
  void onMenuZoomTo50(bool checked)
  {
    const auto v = this->getCurrentActiveView();