//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

#ifndef OSG_SWITCH
#define OSG_SWITCH 1

#include <osg/Group>

namespace osg {

/** Switch is a Group node which allows switching between children.
    Typical uses would be for objects which might need to be rendered
    differently at different times, for instance a switch could be used 
    to represent the different states of a traffic light.
*/
class SG_EXPORT Switch : public Group
{
    public :
        

        Switch();

        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
        Switch(const Switch&,const CopyOp& copyop=CopyOp::SHALLOW_COPY);

        META_Node(osg, Switch);

        virtual void traverse(NodeVisitor& nv);
        
        void setNewChildDefaultValue(bool value) { _newChildDefaultValue = value; }
        
        bool getNewChildDefaultValue() const { return _newChildDefaultValue; }

        virtual bool addChild( Node *child );

        virtual bool addChild( Node *child, bool value );

        virtual bool removeChild( Node *child );

        void setValue(unsigned int pos,bool value);

        void setValue(const Node* child,bool value);
        
        bool getValue(unsigned int pos) const;

        bool getValue(const Node* child) const;

	/**
	 * Special values for the Switch. Use these if you want to
	 * turn on/off all child nodes.
	 */
        enum Values {
                /** All children turned on. */
		ALL_CHILDREN_ON=-1,
                /** All children off. */
		ALL_CHILDREN_OFF=-2,
                /** Multiple children turned on.*/
                MULTIPLE_CHILDREN_ON=-3
        };

	/**
	 * Selects the active child Node or enables a special
	 * SwitchType mode. 
         * @param value the number of the active child
	 * (first child == number 0) or SwitchType. Invalid values
	 * will be ignored.
	 */
        void setValue(int value);

        int getValue() const;

        typedef std::vector<bool>   ValueList;
        
        const ValueList& getValueList() const { return _values; }

    protected :
    
        virtual ~Switch() {}

        // this is effectively a bit mask.
        bool        _newChildDefaultValue;
        ValueList   _values;
};

}

#endif