qgsvectorlayerlabeling.h

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/***************************************************************************
    qgsvectorlayerlabeling.h
    ---------------------
    begin                : September 2015
    copyright            : (C) 2015 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 QGSVECTORLAYERLABELING_H
#define QGSVECTORLAYERLABELING_H
 
#include <memory>
 
#include <QString>
#include <QStringList>
#include <QDomNode>
 
#include "qgis.h"
 
class QDomDocument;
class QDomElement;
 
class QgsPalLayerSettings;
class QgsReadWriteContext;
class QgsVectorLayer;
class QgsVectorLayerLabelProvider;
class QgsStyleEntityVisitorInterface;
 
class CORE_EXPORT QgsAbstractVectorLayerLabeling
{
 
#ifdef SIP_RUN
    SIP_CONVERT_TO_SUBCLASS_CODE
    if ( sipCpp->type() == "simple" )
      sipType = sipType_QgsVectorLayerSimpleLabeling;
    else if ( sipCpp->type() == "rule-based" )
      sipType = sipType_QgsRuleBasedLabeling;
    else
      sipType = 0;
    SIP_END
#endif
 
  public:
 
    QgsAbstractVectorLayerLabeling() = default;
    virtual ~QgsAbstractVectorLayerLabeling() = default;
 
    virtual QString type() const = 0;
 
    virtual QgsAbstractVectorLayerLabeling *clone() const = 0 SIP_FACTORY;
 
    virtual QgsVectorLayerLabelProvider *provider( QgsVectorLayer *layer ) const SIP_SKIP { Q_UNUSED( layer ) return nullptr; }
 
    virtual QDomElement save( QDomDocument &doc, const QgsReadWriteContext &context ) const = 0;
 
    virtual QStringList subProviders() const { return QStringList( QString() ); }
 
    virtual QgsPalLayerSettings settings( const QString &providerId = QString() ) const = 0;
 
    virtual void setSettings( QgsPalLayerSettings *settings SIP_TRANSFER, const QString &providerId = QString() ) = 0;
 
    virtual bool requiresAdvancedEffects() const = 0;
 
    virtual void multiplyOpacity( double opacityFactor ) { Q_UNUSED( opacityFactor ); };
 
 
    // static stuff
 
    static QgsAbstractVectorLayerLabeling *create( const QDomElement &element, const QgsReadWriteContext &context ) SIP_FACTORY;
 
    virtual void toSld( QDomNode &parent, const QVariantMap &props ) const
    {
      Q_UNUSED( parent )
      Q_UNUSED( props )
      QDomDocument doc = parent.ownerDocument();
      parent.appendChild( doc.createComment( QStringLiteral( "SE Export for %1 not implemented yet" ).arg( type() ) ) );
    }
 
    virtual bool accept( QgsStyleEntityVisitorInterface *visitor ) const;
 
    static QgsPalLayerSettings defaultSettingsForLayer( const QgsVectorLayer *layer );
 
  protected:
 
    virtual void writeTextSymbolizer( QDomNode &parent, QgsPalLayerSettings &settings, const QVariantMap &props ) const;
 
  private:
    Q_DISABLE_COPY( QgsAbstractVectorLayerLabeling )
 
#ifdef SIP_RUN
    QgsAbstractVectorLayerLabeling( const QgsAbstractVectorLayerLabeling &rhs );
#endif
 
};
 
class CORE_EXPORT QgsVectorLayerSimpleLabeling : public QgsAbstractVectorLayerLabeling
{
  public:
    explicit QgsVectorLayerSimpleLabeling( const QgsPalLayerSettings &settings );
 
    QString type() const override;
    QgsAbstractVectorLayerLabeling *clone() const override SIP_FACTORY;
    QgsVectorLayerLabelProvider *provider( QgsVectorLayer *layer ) const override SIP_SKIP;
    QDomElement save( QDomDocument &doc, const QgsReadWriteContext &context ) const override;
    QgsPalLayerSettings settings( const QString &providerId = QString() ) const override;
    bool accept( QgsStyleEntityVisitorInterface *visitor ) const override;
 
    void setSettings( QgsPalLayerSettings *settings SIP_TRANSFER, const QString &providerId = QString() ) override;
 
    bool requiresAdvancedEffects() const override;
    void toSld( QDomNode &parent, const QVariantMap &props ) const override;
    void multiplyOpacity( double opacityFactor ) override;
    static QgsVectorLayerSimpleLabeling *create( const QDomElement &element, const QgsReadWriteContext &context );
 
  private:
    std::unique_ptr<QgsPalLayerSettings> mSettings;
};
 
#endif // QGSVECTORLAYERLABELING_H