qgsvectorlayerrenderer.h

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/***************************************************************************
  qgsvectorlayerrenderer.h
  --------------------------------------
  Date                 : December 2013
  Copyright            : (C) 2013 by Martin Dobias
  Email                : wonder dot sk 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 QGSVECTORLAYERRENDERER_H
#define QGSVECTORLAYERRENDERER_H
 
class QgsFeatureRenderer;
class QgsRenderContext;
class QgsVectorLayer;
class QgsVectorLayerFeatureSource;
 
class QgsDiagramRenderer;
class QgsDiagramLayerSettings;
 
class QgsFeatureIterator;
class QgsSingleSymbolRenderer;
class QgsMapClippingRegion;
 
#define SIP_NO_FILE
 
#include <QList>
#include <QPainter>
#include <QElapsedTimer>
 
typedef QList<int> QgsAttributeList;
 
#include "qgis_sip.h"
#include "qgsfields.h"  // QgsFields
#include "qgsfeatureiterator.h"
#include "qgsvectorsimplifymethod.h"
#include "qgsfeedback.h"
#include "qgsfeatureid.h"
 
#include "qgsmaplayerrenderer.h"
 
class QgsVectorLayerLabelProvider;
class QgsVectorLayerDiagramProvider;
 
class QgsVectorLayerRendererInterruptionChecker: public QgsFeedback
{
    Q_OBJECT
 
  public:
    explicit QgsVectorLayerRendererInterruptionChecker( const QgsRenderContext &context );
 
  private:
    const QgsRenderContext &mContext;
    QTimer *mTimer = nullptr;
};
 
class QgsVectorLayerRenderer : public QgsMapLayerRenderer
{
  public:
    QgsVectorLayerRenderer( QgsVectorLayer *layer, QgsRenderContext &context );
    ~QgsVectorLayerRenderer() override;
    QgsFeedback *feedback() const override;
    bool forceRasterRender() const override;
 
    QgsFeatureRenderer *featureRenderer() SIP_SKIP { return mRenderer; }
 
    bool render() override;
 
    void setLayerRenderingTimeHint( int time ) override;
 
  private:
 
    void prepareLabeling( QgsVectorLayer *layer, QSet<QString> &attributeNames );
    void prepareDiagrams( QgsVectorLayer *layer, QSet<QString> &attributeNames );
 
    void drawRenderer( QgsFeatureRenderer *renderer, QgsFeatureIterator &fit );
 
    void drawRendererLevels( QgsFeatureRenderer *renderer, QgsFeatureIterator &fit );
 
    void stopRenderer( QgsFeatureRenderer *renderer, QgsSingleSymbolRenderer *selRenderer );
 
 
    bool renderInternal( QgsFeatureRenderer *renderer );
  protected:
 
    std::unique_ptr< QgsVectorLayerRendererInterruptionChecker > mInterruptionChecker;
 
    QgsVectorLayer *mLayer = nullptr;
 
    QgsFields mFields; // TODO: use fields from mSource
 
    QgsFeatureIds mSelectedFeatureIds;
 
    QString mTemporalFilter;
 
    std::unique_ptr< QgsVectorLayerFeatureSource > mSource;
 
    QgsFeatureRenderer *mRenderer = nullptr;
    std::vector< std::unique_ptr< QgsFeatureRenderer> > mRenderers;
 
    bool mDrawVertexMarkers;
    bool mVertexMarkerOnlyForSelection;
    int mVertexMarkerStyle = 0;
    double mVertexMarkerSize = 2.0;
 
    QgsWkbTypes::GeometryType mGeometryType;
 
    QSet<QString> mAttrNames;
 
    bool mLabeling;
    bool mDiagrams;
 
    QgsVectorLayerLabelProvider *mLabelProvider = nullptr;
 
    QgsVectorLayerDiagramProvider *mDiagramProvider = nullptr;
 
    QPainter::CompositionMode mFeatureBlendMode;
 
    QgsVectorSimplifyMethod mSimplifyMethod;
    bool mSimplifyGeometry;
 
    QList< QgsMapClippingRegion > mClippingRegions;
    QgsGeometry mClipFilterGeom;
    bool mApplyClipFilter = false;
    QgsGeometry mClipFeatureGeom;
    bool mApplyClipGeometries = false;
    QgsGeometry mLabelClipFeatureGeom;
    bool mApplyLabelClipGeometries = false;
    bool mForceRasterRender = false;
 
    int mRenderTimeHint = 0;
    bool mBlockRenderUpdates = false;
    QElapsedTimer mElapsedTimer;
 
};
 
 
#endif // QGSVECTORLAYERRENDERER_H