PickingHandler.h

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/******************************************************************************
 *
 *  Copyright (C) 2008 Boris Iven, Max Hermann
 *
 *  This file is part of the "CEDRIC Event Display" application.
 *
 *****************************************************************************/

#ifndef PICKINGHANDLER_H
#define PICKINGHANDLER_H

#include <osgGA/GUIEventHandler>
#include <osg/ref_ptr>
#include <osgViewer/Viewer>
#include <osgText/Text>


class PickingHandler : public osgGA::GUIEventHandler
{
public:
        class Pickable
        {
                friend class PickingHandler;

        public:
                Pickable() {}
                virtual ~Pickable() {}
                
                virtual void onMouseOver( const osgGA::GUIEventAdapter* ea, osg::Node* )  = 0;
                virtual void onMouseEnter( const osgGA::GUIEventAdapter* ea, osg::Node* ) = 0;
                virtual void onMouseLeave( const osgGA::GUIEventAdapter* ea )             = 0;
        
                virtual bool isPickable( osg::Node* /*node*/ ) { return true; }
                
        protected:
                void setToolTip( std::string text )                  { if( _toolTipNode.valid() ) _toolTipNode->setText(text); }
                void setToolTipPosition( float x, float y, float z ) { if( _toolTipNode.valid() ) _toolTipNode->setPosition( osg::Vec3(x,y,z) ); }
        
        private:
                osg::ref_ptr<osgText::Text> _toolTipNode;

                void setToolTipNode( osgText::Text* node ) { _toolTipNode = node; }
        };
        
        PickingHandler(): m_lastPicked(0), m_enabled(true) { _ea=0; }

        virtual bool handle( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa );

        void setEnabled( bool enable ) { m_enabled = enable; }
        bool isEnabled() const { return m_enabled; }
        
        void setToolTipNode( osgText::Text* node ) { _toolTipNode = node; }
        osgText::Text* getToolTipNode() { return _toolTipNode.get(); }

        void pick( osgViewer::Viewer* viewer, const osgGA::GUIEventAdapter& ea );
        
        void setRoot( osg::Node* root ) { _root = root; }
        
private:        
        bool pickPickable( const osg::NodePath& path );

        Pickable* m_lastPicked;
        bool      m_enabled;

        osg::ref_ptr<const osgGA::GUIEventAdapter> _ea;

        osg::ref_ptr<osgText::Text> _toolTipNode;

        osg::ref_ptr<osg::Node> _root; 
};

#endif