StateSetManipulator

/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSGGA_STATESET_MANIPULATOR
#define OSGGA_STATESET_MANIPULATOR 1

#include <osgGA/Export>
#include <osgGA/GUIEventAdapter>
#include <osgGA/GUIActionAdapter>
#include <osgGA/GUIEventHandler>

#include <osg/StateSet>
#include <osg/PolygonMode>


namespace osgGA {

/**
Experimental class, not been looked at for a while, but which will
be returned to at some point :-\
*/
class OSGGA_EXPORT StateSetManipulator : public GUIEventHandler
{
public:

        StateSetManipulator(osg::StateSet* stateset=0);

        virtual const char* className() const { return "StateSetManipulator"; }

        /** attach a StateSet to the manipulator to be used for specifying view.*/
        virtual void setStateSet(osg::StateSet*);

        /** get the attached a StateSet.*/
        virtual osg::StateSet * getStateSet();

        /** get the attached a StateSet.*/
        virtual const osg::StateSet * getStateSet() const;
        

        /** Handle events, return true if handled, false otherwise.*/
        virtual bool handle(const GUIEventAdapter& ea,GUIActionAdapter& us);        

        /** Get the keyboard and mouse usage of this manipulator.*/
        virtual void getUsage(osg::ApplicationUsage& usage) const;
        
        void setMaximumNumOfTextureUnits(unsigned int i) { _maxNumOfTextureUnits = i; }
        unsigned int getMaximumNumOfTextureUnits() const { return _maxNumOfTextureUnits; }
        
        void setBackfaceEnabled(bool newbackface);
        bool getBackfaceEnabled() const {return _backface;};

        void setLightingEnabled(bool newlighting);
        bool getLightingEnabled() const {return _lighting;};

        void setTextureEnabled(bool newtexture);
        bool getTextureEnabled() const {return _texture;};

        void setPolygonMode(osg::PolygonMode::Mode newpolygonmode);
        osg::PolygonMode::Mode getPolygonMode() const;
        
        void cyclePolygonMode();


        void setKeyEventToggleBackfaceCulling(int key) { _keyEventToggleBackfaceCulling = key; }
        int getKeyEventToggleBackfaceCulling() const { return _keyEventToggleBackfaceCulling; }

        void setKeyEventToggleLighting(int key) { _keyEventToggleLighting = key; }
        int getKeyEventToggleLighting() const { return _keyEventToggleLighting; }

        void setKeyEventToggleTexturing(int key) { _keyEventToggleTexturing = key; }
        int getKeyEventToggleTexturing() const { return _keyEventToggleTexturing; }

        void setKeyEventCyclePolygonMode(int key) { _keyEventCyclePolygonMode = key; }
        int getKeyEventCyclePolygonMode() const { return _keyEventCyclePolygonMode; }

protected:

        virtual ~StateSetManipulator();

        void clone();

        osg::ref_ptr<osg::StateSet> _stateset;

        bool _initialized;
        bool _backface;
        bool _lighting;
        bool _texture;
        unsigned int _maxNumOfTextureUnits;
        
        int _keyEventToggleBackfaceCulling;
        int _keyEventToggleLighting;
        int _keyEventToggleTexturing;
        int _keyEventCyclePolygonMode;

        osg::PolygonMode* getOrCreatePolygonMode();
};

}

#endif