qgsinvertedpolygonrenderer.h

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/***************************************************************************
    qgsinvertedpolygonrenderer.h
    ---------------------
    begin                : April 2014
    copyright            : (C) 2014 Hugo Mercier / Oslandia
    email                : hugo dot mercier at oslandia 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 QGSINVERTEDPOLYGONRENDERER_H
#define QGSINVERTEDPOLYGONRENDERER_H

#include "qgis_core.h"
#include "qgis_sip.h"
#include "qgis.h"
#include "qgsrenderer.h"
#include "qgsexpression.h"
#include "qgsfeature.h"
#include "qgsgeometry.h"

class CORE_EXPORT QgsInvertedPolygonRenderer : public QgsFeatureRenderer
{
  public:

    QgsInvertedPolygonRenderer( QgsFeatureRenderer *embeddedRenderer SIP_TRANSFER = nullptr );

    QgsInvertedPolygonRenderer( const QgsInvertedPolygonRenderer & ) = delete;
    QgsInvertedPolygonRenderer &operator=( const QgsInvertedPolygonRenderer & ) = delete;

    QgsInvertedPolygonRenderer *clone() const override SIP_FACTORY;
    void startRender( QgsRenderContext &context, const QgsFields &fields ) override;

    bool renderFeature( const QgsFeature &feature, QgsRenderContext &context, int layer = -1, bool selected = false, bool drawVertexMarker = false ) override SIP_THROW( QgsCsException );

    void stopRender( QgsRenderContext &context ) override;

    QString dump() const override;
    QSet<QString> usedAttributes( const QgsRenderContext &context ) const override;
    bool filterNeedsGeometry() const override;
    QgsFeatureRenderer::Capabilities capabilities() override;
    QgsSymbolList symbols( QgsRenderContext &context ) const override;
    QgsSymbol *symbolForFeature( const QgsFeature &feature, QgsRenderContext &context ) const override;
    QgsSymbol *originalSymbolForFeature( const QgsFeature &feature, QgsRenderContext &context ) const override;
    QgsSymbolList symbolsForFeature( const QgsFeature &feature, QgsRenderContext &context ) const override;
    QgsSymbolList originalSymbolsForFeature( const QgsFeature &feature, QgsRenderContext &context ) const override;
    QSet< QString > legendKeysForFeature( const QgsFeature &feature, QgsRenderContext &context ) const override;
    QgsLegendSymbolList legendSymbolItems() const override;
    bool willRenderFeature( const QgsFeature &feature, QgsRenderContext &context ) const override;

    static QgsFeatureRenderer *create( QDomElement &element, const QgsReadWriteContext &context ) SIP_FACTORY;

    QDomElement save( QDomDocument &doc, const QgsReadWriteContext &context ) override;

    void setEmbeddedRenderer( QgsFeatureRenderer *subRenderer SIP_TRANSFER ) override;
    const QgsFeatureRenderer *embeddedRenderer() const override;

    void setLegendSymbolItem( const QString &key, QgsSymbol *symbol ) override;

    bool legendSymbolItemsCheckable() const override;
    bool legendSymbolItemChecked( const QString &key ) override;
    void checkLegendSymbolItem( const QString &key, bool state = true ) override;
    bool accept( QgsStyleEntityVisitorInterface *visitor ) const override;

    bool preprocessingEnabled() const { return mPreprocessingEnabled; }

    void setPreprocessingEnabled( bool enabled ) { mPreprocessingEnabled = enabled; }

    static QgsInvertedPolygonRenderer *convertFromRenderer( const QgsFeatureRenderer *renderer ) SIP_FACTORY;

  private:

    std::unique_ptr<QgsFeatureRenderer> mSubRenderer;

    struct CombinedFeature
    {
      QVector<QgsGeometry> geometries; //< list of geometries
      QgsFeature feature;             //< one feature (for attriute-based rendering)
    };
    typedef QVector<CombinedFeature> FeatureCategoryVector;
    FeatureCategoryVector mFeaturesCategories;

    QMap<QByteArray, int> mSymbolCategories;

    QgsPolygonXY mExtentPolygon;

    QgsRenderContext mContext;

    QgsFields mFields;

    struct FeatureDecoration
    {
      QgsFeature feature;
      bool selected;
      bool drawMarkers;
      int layer;
      FeatureDecoration( const QgsFeature &a_feature, bool a_selected, bool a_drawMarkers, int a_layer )
        : feature( a_feature )
        , selected( a_selected )
        , drawMarkers( a_drawMarkers )
        , layer( a_layer )
      {}
    };
    QList<FeatureDecoration> mFeatureDecorations;

    bool mPreprocessingEnabled = false;
};


#endif // QGSINVERTEDPOLYGONRENDERER_H