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/*  -*-c++-*- 
 *  Copyright (C) 2009 Cedric Pinson <cedric.pinson@plopbyte.net>
 *
 * 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 OSGANIMATION_ACTIONVISITOR_H
#define OSGANIMATION_ACTIONVISITOR_H

#include <vector>
#include <osgAnimation/Export>
#include <osg/Referenced>
#include <osgAnimation/FrameAction>

namespace osgAnimation
{

    class Timeline;
    class Action;
    class ActionBlendIn;
    class ActionBlendOut;
    class ActionAnimation;
    class ActionStripAnimation;

#define META_ActionVisitor(library,name) \
        virtual const char* libraryName() const { return #library; }\
        virtual const char* className() const { return #name; }


    class OSGANIMATION_EXPORT ActionVisitor : public osg::Referenced
    {
    public:
        META_ActionVisitor(osgAnimation, ActionVisitor);
        ActionVisitor();
        void traverse(Action& visitor);

        void pushFrameActionOnStack(const FrameAction& fa);
        void popFrameAction();

        void pushTimelineOnStack(Timeline* tm);
        void popTimeline();

        Timeline* getCurrentTimeline();
        void setCurrentLayer(int layer) { _currentLayer = layer;}
        int getCurrentLayer() const { return _currentLayer; }

        const std::vector<FrameAction>& getStackedFrameAction() const { return _stackFrameAction; }

        virtual void apply(Action& action);
        virtual void apply(Timeline& tm);
        virtual void apply(ActionBlendIn& action);
        virtual void apply(ActionBlendOut& action);
        virtual void apply(ActionAnimation& action);
        virtual void apply(ActionStripAnimation& action);

    protected:
        std::vector<FrameAction> _stackFrameAction;
        std::vector<Timeline*> _stackTimeline;
        int _currentLayer;
    };


    class OSGANIMATION_EXPORT UpdateActionVisitor : public osgAnimation::ActionVisitor
    {
    protected:
        unsigned int _frame;
        unsigned int _currentAnimationPriority;
    public:
        META_ActionVisitor(osgAnimation, UpdateActionVisitor);
        UpdateActionVisitor();
        void setFrame(unsigned int frame) { _frame = frame;}

        bool isActive(Action& action) const;
        unsigned int getLocalFrame() const;

        void apply(Timeline& action);
        void apply(Action& action);
        void apply(ActionBlendIn& action);
        void apply(ActionBlendOut& action);
        void apply(ActionAnimation& action);
        void apply(ActionStripAnimation& action);

    };


    class OSGANIMATION_EXPORT ClearActionVisitor : public osgAnimation::ActionVisitor
    {
    public:
        enum ClearType {
            BEFORE_FRAME,
            AFTER_FRAME
        };

        META_ActionVisitor(osgAnimation, ClearActionVisitor);
        ClearActionVisitor(ClearType type = BEFORE_FRAME);
        void setFrame(unsigned int frame) { _frame = frame;}

        void apply(Timeline& action);
        void apply(Action& action);

    protected:
        unsigned int _frame;
        std::vector<osg::ref_ptr<Action> > _remove;
        ClearType _clearType;
    };

}

#endif