cxViewCache.h

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/*=========================================================================
This file is part of CustusX, an Image Guided Therapy Application.

Copyright (c) 2008-2014, SINTEF Department of Medical Technology
All rights reserved.

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   this list of conditions and the following disclaimer.

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   may be used to endorse or promote products derived from this software 
   without specific prior written permission.

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#ifndef CXVIEWCACHE_H_
#define CXVIEWCACHE_H_

#include "cxResourceVisualizationExport.h"

#include <QWidget>
#include <QLayout>
#include <vector>
#include "cxTypeConversions.h"
#include "cxOSXHelper.h"
#include "cxViewWidget.h"
#include "cxRenderWindowFactory.h"

namespace cx
{
template<class VIEW_TYPE>
class cxResourceVisualization_EXPORT ViewCache
{
public:
        ViewCache(RenderWindowFactoryPtr factory, QWidget* widget, QString typeText) :
                mRenderWindowFactory(factory),
                mCentralWidget(widget),
                mNameGenerator(0),
                mTypeText(typeText)
        {
        }
        VIEW_TYPE* retrieveView()
        {
                if (mCached.empty())
                {
                        QString uid = QString("%1-%2-%3")
                                        .arg(mTypeText)
                                        .arg(mNameGenerator++)
                                        .arg(reinterpret_cast<long>(this));
                        VIEW_TYPE* view = new VIEW_TYPE(mRenderWindowFactory, uid, uid, mCentralWidget);
                        mCached.push_back(view);
                }

                VIEW_TYPE* retval = mCached.back();
                mCached.pop_back();
                mUsed.push_back(retval);
                return retval;
        }
        void clearUsedViews()
        {
                std::copy(mUsed.begin(), mUsed.end(), back_inserter(mCached));
                mUsed.clear();
        }
        void clearCache()
        {
                mCached.clear();
                mUsed.clear();
        }

private:
        QWidget* mCentralWidget;
        int mNameGenerator;
        QString mTypeText;
        std::vector<VIEW_TYPE*> mCached;
        std::vector<VIEW_TYPE*> mUsed;
        RenderWindowFactoryPtr mRenderWindowFactory;
};


} // namespace cx

#endif /* CXVIEWCACHE_H_ */