qgsrenderedfeaturehandlerinterface.h

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/***************************************************************************
  qgsrenderedfeaturehandlerinterface.h
  --------------------------------------
  Date                 : August 2019
  Copyright            : (C) 2019 by Nyall Dawson
  Email                : nyall dot dawson at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSRENDEREDFEATUREHANDLERINTERFACE_H
#define QGSRENDEREDFEATUREHANDLERINTERFACE_H
 
#include "qgis_core.h"
#include "qgis_sip.h"
 
#include <QSet>
#include <QString>
 
class QgsFeature;
class QgsGeometry;
class QgsRenderContext;
class QgsVectorLayer;

class CORE_EXPORT QgsRenderedFeatureHandlerInterface
{
  public:
    virtual ~QgsRenderedFeatureHandlerInterface() = default;
 
    struct CORE_EXPORT RenderedFeatureContext
    {
        RenderedFeatureContext( const QgsRenderContext &renderContext )
          : renderContext( renderContext )
        {}

        const QgsRenderContext &renderContext;
 
      private:
#ifdef SIP_RUN
        RenderedFeatureContext &operator=( const RenderedFeatureContext & );
#endif
    };

    virtual void handleRenderedFeature( const QgsFeature &feature, const QgsGeometry &renderedBounds, const QgsRenderedFeatureHandlerInterface::RenderedFeatureContext &context ) = 0;

    virtual QSet<QString> usedAttributes( QgsVectorLayer *layer, const QgsRenderContext &context ) const
    {
      Q_UNUSED( layer );
      Q_UNUSED( context );
      return QSet< QString >();
    }
};
 
#endif // QGSRENDEREDFEATUREHANDLERINTERFACE_H