84 lines
2.5 KiB
C++
84 lines
2.5 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_OBSERVERNODEPATH
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#define OSG_OBSERVERNODEPATH 1
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#include <osg/Node>
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#include <osg/Observer>
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#include <osg/ref_ptr>
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#include <list>
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namespace osg {
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typedef std::list< osg::ref_ptr<osg::Node> > RefNodePath;
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/** ObserverNodePath is an observer class for tracking changes to a NodePath,
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* that automatically invalidates it when nodes are deleted.*/
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class OSG_EXPORT ObserverNodePath : public osg::Observer
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{
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public:
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ObserverNodePath();
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ObserverNodePath(const ObserverNodePath& rhs);
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ObserverNodePath(const osg::NodePath& nodePath);
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~ObserverNodePath();
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ObserverNodePath& operator = (const ObserverNodePath& rhs);
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bool valid() const { return _valid; }
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/** get the NodePath from the first parental chain back to root, plus the specified node.*/
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void setNodePathTo(osg::Node* node);
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void setNodePath(const osg::RefNodePath& nodePath);
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void setNodePath(const osg::NodePath& nodePath);
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void clearNodePath();
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/** Get a thread safe RefNodePath, return true if NodePath is valid.*/
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bool getRefNodePath(RefNodePath& refNodePath) const;
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/** Get a lightweight NodePath that isn't thread safe but
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* may be safely used in single threaded applications, or when
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* its known that the NodePath won't be invalidated during usage
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* of the NodePath. return true if NodePath is valid.*/
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bool getNodePath(NodePath& nodePath) const;
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bool empty() const
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{
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if (!_valid) return true;
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OpenThreads::ScopedLock<OpenThreads::Mutex> lock(*getObserverMutex());
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return _nodePath.empty();
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}
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protected:
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void _setNodePath(const osg::NodePath& nodePath);
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void _clearNodePath();
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virtual bool objectUnreferenced(void* ptr);
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osg::NodePath _nodePath;
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bool _valid;
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};
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}
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#endif
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