81 lines
2.2 KiB
Plaintext
81 lines
2.2 KiB
Plaintext
//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
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//Distributed under the terms of the GNU Library General Public License (LGPL)
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//as published by the Free Software Foundation.
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#ifndef OSG_NODECALLBACK
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#define OSG_NODECALLBACK 1
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#include <osg/Referenced>
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namespace osg {
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class Node;
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class NodeVisitor;
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class SG_EXPORT NodeCallback : public Referenced {
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public :
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NodeCallback(){}
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virtual ~NodeCallback() {}
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/** Callback method call 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 repsonsible for scenegraph traversal so
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// should always include call the 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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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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NodeCallback* nested_nc = _nestedCallback->getNestedCallback();
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if (nested_nc) _nestedCallback = nc;
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else _nestedCallback = 0;
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}
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else
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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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};
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} // namespace
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#endif
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