OpenWalnut  1.4.0
WGENodeMaskCallback.cpp
00001 //---------------------------------------------------------------------------
00002 //
00003 // Project: OpenWalnut ( http://www.openwalnut.org )
00004 //
00005 // Copyright 2009 OpenWalnut Community, BSV@Uni-Leipzig and CNCF@MPI-CBS
00006 // For more information see http://www.openwalnut.org/copying
00007 //
00008 // This file is part of OpenWalnut.
00009 //
00010 // OpenWalnut is free software: you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as published by
00012 // the Free Software Foundation, either version 3 of the License, or
00013 // (at your option) any later version.
00014 //
00015 // OpenWalnut is distributed in the hope that it will be useful,
00016 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00018 // GNU Lesser General Public License for more details.
00019 //
00020 // You should have received a copy of the GNU Lesser General Public License
00021 // along with OpenWalnut. If not, see <http://www.gnu.org/licenses/>.
00022 //
00023 //---------------------------------------------------------------------------
00024 
00025 #include "WGENodeMaskCallback.h"
00026 
00027 WGENodeMaskCallback::WGENodeMaskCallback( boost::shared_ptr< WBoolFlag > flag ):
00028     osg::NodeCallback(),
00029     m_flag( flag )
00030 {
00031     // get change signal
00032     m_connection = m_flag->getValueChangeCondition()->subscribeSignal(
00033             boost::bind( &WGENodeMaskCallback::activate, this )
00034     );
00035 }
00036 
00037 WGENodeMaskCallback::~WGENodeMaskCallback()
00038 {
00039     // cleanup
00040     m_connection.disconnect();
00041 }
00042 
00043 void WGENodeMaskCallback::activate()
00044 {
00045     if( m_flag->get() ) // only handle activation here
00046     {
00047         m_reactivateSignal();
00048     }
00049 }
00050 
00051 void WGENodeMaskCallback::operator()( osg::Node* node, osg::NodeVisitor* nv )
00052 {
00053     // Deactivate the node
00054     if( !m_flag->get() ) // only handle deactivation here
00055     {
00056         node->setNodeMask( 0x0 );
00057 
00058         // NOTE: this also deactivates the callback. So reactivating the node is done in a separate method
00059         // connect the flag's callback to the signal, only this way, we can ensure the reactivation of a node without saving a pointer to it.
00060         m_reactivateConnection = m_reactivateSignal.connect( boost::bind( &osg::Node::setNodeMask, node, 0xFFFFFFFF ) );
00061     }
00062 
00063     traverse( node, nv );
00064 }
00065