107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
/* -*-c++-*- */
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/* osgEarth - Geospatial SDK for OpenSceneGraph
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* Copyright 2020 Pelican Mapping
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* http://osgearth.org
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*
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* osgEarth is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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#ifndef OSGEARTH_MAP_NODE_OBSERVER_H
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#define OSGEARTH_MAP_NODE_OBSERVER_H 1
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#include <osgEarth/Common>
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#include <osgEarth/MapNode>
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namespace osgEarth
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{
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/**
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* This is a marker class for objects (and nodes) that reference a MapNode.
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*
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* The usage pattern for this class is to include it as a superclass using
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* multiple inheritance (if necessary) and to implement the set/get MapNode
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* methods. If you store a local reference to the MapNode, you should use
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* an osg::observer_ptr<> to do so!
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*
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* You can update as scene graph containing MapNodeObservers by using the
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* MapNodeObserverSetter visitor.
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*/
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class /*header-only*/ MapNodeObserver
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{
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public:
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/**
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* Sets the map node's observer reference
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*/
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virtual void setMapNode( MapNode* mapNode ) =0;
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/**
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* Gets the map node from its observer reference
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*/
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virtual MapNode* getMapNode() =0;
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/**
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* dtor
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*/
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virtual ~MapNodeObserver() { }
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};
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/**
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* Base class for a visitor that operates on MapNodeObserver instances
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* found in a scene graph.
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*/
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class /*header-only*/ MapNodeObserverVisitor : public osg::NodeVisitor
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{
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public:
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MapNodeObserverVisitor(osg::NodeVisitor::TraversalMode mode =osg::NodeVisitor::TRAVERSE_ALL_CHILDREN)
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: osg::NodeVisitor( mode ) { }
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virtual void apply( MapNodeObserver* m ) = 0;
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void tryApply( MapNodeObserver* m )
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{
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if ( m ) apply( m );
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}
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void apply( osg::Node& node )
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{
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tryApply( dynamic_cast<MapNodeObserver*>(&node) );
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tryApply( dynamic_cast<MapNodeObserver*>(node.getEventCallback()) );
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tryApply( dynamic_cast<MapNodeObserver*>(node.getUpdateCallback()) );
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tryApply( dynamic_cast<MapNodeObserver*>(node.getCullCallback()) );
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traverse( node );
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}
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};
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/**
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* Visitor that traverses a graph and calls setMapNode() on each
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* MapNodeObserver found.
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*/
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class /*header-only*/ MapNodeReplacer : public MapNodeObserverVisitor
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{
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public:
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MapNodeReplacer( MapNode* mapNode ) : _mapNode(mapNode) { }
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void apply( MapNodeObserver* m )
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{
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m->setMapNode( _mapNode.get() );
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}
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private:
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osg::observer_ptr<MapNode> _mapNode;
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};
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} // namespace osgEarth
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#endif // OSGEARTH_MAP_NODE_OBSERVER_H
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