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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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 OSGVIEWER_CompositeViewer
#define OSGVIEWER_CompositeViewer 1

#include <osg/ArgumentParser>
#include <osgUtil/UpdateVisitor>
#include <osgViewer/GraphicsWindow>
#include <osgViewer/View>

namespace osgViewer {

/** CompositeViewer holds one or more views to one or more scenes.*/
class OSGVIEWER_EXPORT CompositeViewer : public ViewerBase
{
    public:

        CompositeViewer();

        CompositeViewer(const CompositeViewer&,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);

        CompositeViewer(osg::ArgumentParser& arguments);

        META_Object(osgViewer,CompositeViewer);

        virtual ~CompositeViewer();

        /** Read the viewer configuration from a configuration file.*/
        bool readConfiguration(const std::string& filename);


        /** Set the Stats object used for collect various frame related timing and scene graph stats.*/
        virtual void setViewerStats(osg::Stats* stats) { _stats = stats; }

        /** Get the Viewers Stats object.*/
        virtual osg::Stats* getViewerStats() { return _stats.get(); }

        /** Get the Viewers Stats object.*/
        virtual const osg::Stats* getViewerStats() const { return _stats.get(); }


        void addView(osgViewer::View* view);
        void removeView(osgViewer::View* view);

        osgViewer::View* getView(unsigned i) { return _views[i].get(); }
        const osgViewer::View* getView(unsigned i) const { return _views[i].get(); }

        unsigned int getNumViews() const { return _views.size(); }


        /** Get whether at least of one of this viewer's windows are realized.*/
        virtual bool isRealized() const;

        /** Set up windows and associated threads.*/
        virtual void realize();

        virtual void setStartTick(osg::Timer_t tick);

        void setReferenceTime(double time=0.0);

        osg::FrameStamp* getFrameStamp() { return _frameStamp.get(); }
        const osg::FrameStamp* getFrameStamp() const { return _frameStamp.get(); }

        virtual double elapsedTime();

        virtual osg::FrameStamp* getViewerFrameStamp() { return getFrameStamp(); }


        /** Execute a main frame loop.
          * Equivalent to while (!viewer.done()) viewer.frame();
          * Also calls realize() if the viewer is not already realized,
          * and installs trackball manipulator if one is not already assigned.
          */
        virtual int run();

        /** Check to see if the new frame is required, called by run() when FrameScheme is set to ON_DEMAND.*/
        virtual bool checkNeedToDoFrame();

        /** check to see if events have been received, return true if events are now available.*/
        virtual bool checkEvents();

        virtual void advance(double simulationTime=USE_REFERENCE_TIME);

        virtual void eventTraversal();

        virtual void updateTraversal();


        void setCameraWithFocus(osg::Camera* camera);
        osg::Camera* getCameraWithFocus() { return _cameraWithFocus.get(); }
        const osg::Camera* getCameraWithFocus() const { return _cameraWithFocus.get(); }

        osgViewer::View* getViewWithFocus() { return _viewWithFocus.get(); }
        const osgViewer::View* getViewWithFocus() const { return _viewWithFocus.get(); }

        virtual void getCameras(Cameras& cameras, bool onlyActive=true);

        virtual void getContexts(Contexts& contexts, bool onlyValid=true);

        virtual void getAllThreads(Threads& threads, bool onlyActive=true);

        virtual void getOperationThreads(OperationThreads& threads, bool onlyActive=true);

        virtual void getScenes(Scenes& scenes, bool onlyValid=true);

        virtual void getViews(Views& views, bool onlyValid=true);


        /** Get the keyboard and mouse usage of this viewer.*/
        virtual void getUsage(osg::ApplicationUsage& usage) const;

    protected:

        void constructorInit();

        virtual void viewerInit();

        void generateSlavePointerData(osg::Camera* camera, osgGA::GUIEventAdapter& event);
        void generatePointerData(osgGA::GUIEventAdapter& event);
        void reprojectPointerData(osgGA::GUIEventAdapter& source_event, osgGA::GUIEventAdapter& dest_event);

        typedef std::vector< osg::ref_ptr<osgViewer::View> > RefViews;
        RefViews _views;

        bool _firstFrame;

        osg::ref_ptr<osg::Stats>            _stats;

        osg::Timer_t                        _startTick;
        osg::ref_ptr<osg::FrameStamp>       _frameStamp;

        osg::observer_ptr<osg::Camera>      _cameraWithFocus;
        osg::observer_ptr<osgViewer::View>  _viewWithFocus;
        
        osg::ref_ptr<osgGA::GUIEventAdapter> _previousEvent;

};


}

#endif