OSG addEventHandler W键 L键 F键

// add the state manipulator
    viewer->addEventHandler( new osgGA::StateSetManipulator(viewer->getCamera()->getOrCreateStateSet()) );
 // add the thread model handler
    viewer->addEventHandler(new osgViewer::ThreadingHandler);
 // add the window size toggle handler
    viewer->addEventHandler(new osgViewer::WindowSizeHandler);
 // add the stats handler
    viewer->addEventHandler(new osgViewer::StatsHandler);
 // add the record camera path handler
    viewer->addEventHandler(new osgViewer::RecordCameraPathHandler);
 // add the LOD Scale handler
    viewer->addEventHandler(new osgViewer::LODScaleHandler);
 // add the screen capture handler
    viewer->addEventHandler(new osgViewer::ScreenCaptureHandler);