/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 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 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 insertChild( unsigned int index, Node *child );

        virtual bool insertChild( unsigned int index, Node *child, bool value );

        virtual bool removeChild( Node *child );

        void setValue(unsigned int pos,bool value);

        bool getValue(unsigned int pos) const;

        void setChildValue(const Node* child,bool value);
        
        bool getChildValue(const Node* child) const;

        /** Set all the children off (false), and set the new default child value to off (false).*/
        bool setAllChildrenOff();
        
        /** Set all the children on (true), and set the new default child value to on (true).*/
        bool setAllChildrenOn();
        
        /** Set a single child to be on, switch off all other children.*/
        bool setSingleChildOn(unsigned int pos);
        
#ifdef USE_DEPRECATED_API
	/**
	 * 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;
        
#endif        

        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