99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library 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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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSG_NODECALLBACK
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#define OSG_NODECALLBACK 1
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#include <osg/Object>
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#include <osg/ref_ptr>
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namespace osg {
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class Node;
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class NodeVisitor;
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class OSG_EXPORT NodeCallback : public virtual Object {
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public :
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NodeCallback(){}
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NodeCallback(const NodeCallback& nc,const CopyOp&):
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_nestedCallback(nc._nestedCallback) {}
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META_Object(osg,NodeCallback);
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/** Callback method called by the NodeVisitor when visiting a node.*/
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virtual void operator()(Node* node, NodeVisitor* nv)
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{
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// note, callback is responsible for scenegraph traversal so
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// should always include call traverse(node,nv) to ensure
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// that the rest of cullbacks and the scene graph are traversed.
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traverse(node,nv);
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}
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/** Call any nested callbacks and then traverse the scene graph. */
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void traverse(Node* node,NodeVisitor* nv);
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void setNestedCallback(NodeCallback* nc) { _nestedCallback = nc; }
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NodeCallback* getNestedCallback() { return _nestedCallback.get(); }
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const NodeCallback* getNestedCallback() const { return _nestedCallback.get(); }
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inline void addNestedCallback(NodeCallback* nc)
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{
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if (nc)
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{
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if (_nestedCallback.valid())
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{
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nc->addNestedCallback(_nestedCallback.get());
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_nestedCallback = nc;
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}
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else
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{
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_nestedCallback = nc;
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}
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}
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}
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inline void removeNestedCallback(NodeCallback* nc)
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{
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if (nc)
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{
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if (_nestedCallback==nc)
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{
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_nestedCallback = _nestedCallback->getNestedCallback();
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}
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else if (_nestedCallback.valid())
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{
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_nestedCallback->removeNestedCallback(nc);
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}
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}
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}
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public:
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ref_ptr<NodeCallback> _nestedCallback;
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protected:
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virtual ~NodeCallback() {}
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};
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} // namespace
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#endif
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