qgslabelingenginesettings.h

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/***************************************************************************
    qgslabelingenginesettings.h
    ---------------------
    begin                : April 2017
    copyright            : (C) 2017 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 QGSLABELINGENGINESETTINGS_H
#define QGSLABELINGENGINESETTINGS_H

#include "qgis_core.h"
#include "qgsrendercontext.h"
#include <QFlags>

class QgsProject;

class CORE_EXPORT QgsLabelingEngineSettings
{
  public:
    enum Flag
    {
      UseAllLabels          = 1 << 1,  
      UsePartialCandidates  = 1 << 2,  
      // TODO QGIS 4.0: remove
      RenderOutlineLabels   = 1 << 3,  
      DrawLabelRectOnly     = 1 << 4,  
      DrawCandidates        = 1 << 5,  
    };
    Q_DECLARE_FLAGS( Flags, Flag )

    
    enum Search
    {
      Chain,
      Popmusic_Tabu,
      Popmusic_Chain,
      Popmusic_Tabu_Chain,
      Falp
    };

    QgsLabelingEngineSettings();

    void clear();

    void setFlags( Flags flags ) { mFlags = flags; }
    Flags flags() const { return mFlags; }
    bool testFlag( Flag f ) const { return mFlags.testFlag( f ); }
    void setFlag( Flag f, bool enabled = true ) { if ( enabled ) mFlags |= f; else mFlags &= ~f; }

    void numCandidatePositions( int &candPoint, int &candLine, int &candPolygon ) const { candPoint = mCandPoint; candLine = mCandLine; candPolygon = mCandPolygon; }
    void setNumCandidatePositions( int candPoint, int candLine, int candPolygon ) { mCandPoint = candPoint; mCandLine = candLine; mCandPolygon = candPolygon; }

    void setSearchMethod( Search s ) { mSearchMethod = s; }
    Search searchMethod() const { return mSearchMethod; }

    void readSettingsFromProject( QgsProject *project );
    void writeSettingsToProject( QgsProject *project );

    // TODO QGIS 4.0: In reality the text render format settings don't only apply to labels, but also
    // ANY text rendered using QgsTextRenderer (including some non-label text items in layouts).
    // These methods should possibly be moved out of here and into the general QgsProject settings.

    QgsRenderContext::TextRenderFormat defaultTextRenderFormat() const
    {
      return mDefaultTextRenderFormat;
    }

    void setDefaultTextRenderFormat( QgsRenderContext::TextRenderFormat format )
    {
      mDefaultTextRenderFormat = format;
    }

  private:
    Flags mFlags;
    Search mSearchMethod = Chain;
    int mCandPoint = 16, mCandLine = 50, mCandPolygon = 30;

    QgsRenderContext::TextRenderFormat mDefaultTextRenderFormat = QgsRenderContext::TextFormatAlwaysOutlines;

};

Q_DECLARE_OPERATORS_FOR_FLAGS( QgsLabelingEngineSettings::Flags )

#endif // QGSLABELINGENGINESETTINGS_H