FocusPolicy.hpp

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/******************************************************************************\
* FocusPolicy.hpp                                                              *
* Interface for policies used to change the focus from one node to another.    *
*                                                                              *
* Copyright (C) 2006-2010 by Leandro Motta Barros.                             *
*                                                                              *
* This program is distributed under the OpenSceneGraph Public License. You     *
* should have received a copy of it with the source distribution, in a file    *
* named 'COPYING.txt'.                                                         *
\******************************************************************************/

#ifndef _OSGUISH_FOCUS_POLICY_HPP_
#define _OSGUISH_FOCUS_POLICY_HPP_

#include <boost/shared_ptr.hpp>
#include <osgGA/GUIEventAdapter>
#include <OSGUIsh/Types.hpp>


namespace OSGUIsh
{
   class FocusPolicy
   {
      public:
         FocusPolicy(NodePtr& focusedNode);

         virtual void updateFocus(const osgGA::GUIEventAdapter& ea,
                                  const NodePtr nodeUnderMouse) = 0;

      protected:
         void setFocusedNode(NodePtr focusedNode)
         { focusedNode_ = focusedNode; }

      private:
         NodePtr& focusedNode_;
   };



   typedef boost::shared_ptr<FocusPolicy> FocusPolicyPtr;



   class FocusPolicyFactory
   {
      public:
         virtual FocusPolicyPtr create(NodePtr& focusedNode) const = 0;
   };



   template <class T>
   class FocusPolicyFactoryMason: public FocusPolicyFactory
   {
      public:
         // (inherits docs)
         virtual FocusPolicyPtr create(NodePtr& focusedNode) const
         {
            return FocusPolicyPtr(new T(focusedNode));
         }
   };

} // namespace OSGUIsh

#endif // _OSGUISH_FOCUS_POLICY_HPP_