qgsrendererregistry.h

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/***************************************************************************
    qgsrendererregistry.h
    ---------------------
    begin                : November 2009
    copyright            : (C) 2009 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 QGSRENDERERREGISTRY_H
#define QGSRENDERERREGISTRY_H

#include "qgis_core.h"
#include "qgis_sip.h"
#include <QIcon>
#include <QMap>
#include <QStringList>
#include <QDomElement>

// #include "qgis.h"
#include "qgswkbtypes.h"

class QgsFeatureRenderer;
class QgsReadWriteContext;
class QgsVectorLayer;
class QgsStyle;
class QgsRendererWidget SIP_EXTERNAL;

class CORE_EXPORT QgsRendererAbstractMetadata
{
  public:

    enum LayerType
    {
      PointLayer = 1, 
      LineLayer = 2, 
      PolygonLayer = 4, 
      All = PointLayer | LineLayer | PolygonLayer, 
    };
    Q_DECLARE_FLAGS( LayerTypes, LayerType )

    QgsRendererAbstractMetadata( const QString &name, const QString &visibleName, const QIcon &icon = QIcon() )
      : mName( name )
      , mVisibleName( visibleName )
      , mIcon( icon )
    {}
    virtual ~QgsRendererAbstractMetadata() = default;

    QString name() const { return mName; }
    QString visibleName() const { return mVisibleName; }

    QIcon icon() const { return mIcon; }
    void setIcon( const QIcon &icon ) { mIcon = icon; }

    virtual QgsRendererAbstractMetadata::LayerTypes compatibleLayerTypes() const { return All; }

    virtual QgsFeatureRenderer *createRenderer( QDomElement &elem, const QgsReadWriteContext &context ) = 0 SIP_FACTORY;

    virtual QgsRendererWidget *createRendererWidget( QgsVectorLayer *layer, QgsStyle *style, QgsFeatureRenderer *oldRenderer ) SIP_FACTORY
    { Q_UNUSED( layer ) Q_UNUSED( style ); Q_UNUSED( oldRenderer ); return nullptr; }

    virtual QgsFeatureRenderer *createRendererFromSld( QDomElement &elem, QgsWkbTypes::GeometryType geomType ) SIP_FACTORY
    { Q_UNUSED( elem ) Q_UNUSED( geomType ); return nullptr; }

  protected:
    QString mName;
    QString mVisibleName;
    QIcon mIcon;
};


Q_DECLARE_OPERATORS_FOR_FLAGS( QgsRendererAbstractMetadata::LayerTypes )


typedef QgsFeatureRenderer *( *QgsRendererCreateFunc )( QDomElement &, const QgsReadWriteContext & ) SIP_SKIP;
typedef QgsRendererWidget *( *QgsRendererWidgetFunc )( QgsVectorLayer *, QgsStyle *, QgsFeatureRenderer * ) SIP_SKIP;
typedef QgsFeatureRenderer *( *QgsRendererCreateFromSldFunc )( QDomElement &, QgsWkbTypes::GeometryType geomType ) SIP_SKIP;

class CORE_EXPORT QgsRendererMetadata : public QgsRendererAbstractMetadata
{
  public:

    QgsRendererMetadata( const QString &name,
                         const QString &visibleName,
                         QgsRendererCreateFunc pfCreate,
                         const QIcon &icon = QIcon(),
                         QgsRendererWidgetFunc pfWidget = nullptr,
                         QgsRendererAbstractMetadata::LayerTypes layerTypes = QgsRendererAbstractMetadata::All ) SIP_SKIP
  : QgsRendererAbstractMetadata( name, visibleName, icon )
    , mCreateFunc( pfCreate )
    , mWidgetFunc( pfWidget )
    , mCreateFromSldFunc( nullptr )
    , mLayerTypes( layerTypes )
    {}

    QgsRendererMetadata( const QString &name,
                         const QString &visibleName,
                         QgsRendererCreateFunc pfCreate,
                         QgsRendererCreateFromSldFunc pfCreateFromSld,
                         const QIcon &icon = QIcon(),
                         QgsRendererWidgetFunc pfWidget = nullptr,
                         QgsRendererAbstractMetadata::LayerTypes layerTypes = QgsRendererAbstractMetadata::All ) SIP_SKIP
  : QgsRendererAbstractMetadata( name, visibleName, icon )
    , mCreateFunc( pfCreate )
    , mWidgetFunc( pfWidget )
    , mCreateFromSldFunc( pfCreateFromSld )
    , mLayerTypes( layerTypes )
    {}

    QgsFeatureRenderer *createRenderer( QDomElement &elem, const QgsReadWriteContext &context ) override SIP_FACTORY
    { return mCreateFunc ? mCreateFunc( elem, context ) : nullptr; }
    QgsRendererWidget *createRendererWidget( QgsVectorLayer *layer, QgsStyle *style, QgsFeatureRenderer *renderer ) override SIP_FACTORY
    { return mWidgetFunc ? mWidgetFunc( layer, style, renderer ) : nullptr; }
    QgsFeatureRenderer *createRendererFromSld( QDomElement &elem, QgsWkbTypes::GeometryType geomType ) override SIP_FACTORY
    { return mCreateFromSldFunc ? mCreateFromSldFunc( elem, geomType ) : nullptr; }

    QgsRendererCreateFunc createFunction() const { return mCreateFunc; } SIP_SKIP
    QgsRendererWidgetFunc widgetFunction() const { return mWidgetFunc; } SIP_SKIP
    QgsRendererCreateFromSldFunc createFromSldFunction() const { return mCreateFromSldFunc; } SIP_SKIP

    void setWidgetFunction( QgsRendererWidgetFunc f ) { mWidgetFunc = f; } SIP_SKIP

    QgsRendererAbstractMetadata::LayerTypes compatibleLayerTypes() const override { return mLayerTypes; }

  protected:
    QgsRendererCreateFunc mCreateFunc;
    QgsRendererWidgetFunc mWidgetFunc;
    QgsRendererCreateFromSldFunc mCreateFromSldFunc;

  private:
#ifdef SIP_RUN
    QgsRendererMetadata();
#endif

    QgsRendererAbstractMetadata::LayerTypes mLayerTypes;
};


class CORE_EXPORT QgsRendererRegistry
{
  public:

    QgsRendererRegistry();
    ~QgsRendererRegistry();

    QgsRendererRegistry( const QgsRendererRegistry &rh ) = delete;
    QgsRendererRegistry &operator=( const QgsRendererRegistry &rh ) = delete;

    bool addRenderer( QgsRendererAbstractMetadata *metadata SIP_TRANSFER );

    bool removeRenderer( const QString &rendererName );

    QgsRendererAbstractMetadata *rendererMetadata( const QString &rendererName );

    QStringList renderersList( QgsRendererAbstractMetadata::LayerTypes layerTypes = QgsRendererAbstractMetadata::All ) const;

    QStringList renderersList( const QgsVectorLayer *layer ) const;

  private:
#ifdef SIP_RUN
    QgsRendererRegistry( const QgsRendererRegistry &rh );
#endif

    QMap<QString, QgsRendererAbstractMetadata *> mRenderers;

    QStringList mRenderersOrder;
};

#endif // QGSRENDERERREGISTRY_H