qgslegendrenderer.h

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/***************************************************************************
  qgslegendrenderer.h
  --------------------------------------
  Date                 : July 2014
  Copyright            : (C) 2014 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 QGSLEGENDRENDERER_H
#define QGSLEGENDRENDERER_H

#include "qgis_core.h"
#include <QPointF>

class QRectF;
class QStandardItem;

class QgsLayerTreeGroup;
class QgsLayerTreeLayer;
class QgsLayerTreeModel;
class QgsLayerTreeModelLegendNode;
class QgsLayerTreeNode;
class QgsSymbol;
class QgsRenderContext;

#include "qgslegendsettings.h"

class CORE_EXPORT QgsLegendRenderer
{
  public:

    QgsLegendRenderer( QgsLayerTreeModel *legendModel, const QgsLegendSettings &settings );

    QSizeF minimumSize( QgsRenderContext *renderContext = nullptr );

    void setLegendSize( QSizeF s ) { mLegendSize = s; }

    QSizeF legendSize() const { return mLegendSize; }

    void drawLegend( QPainter *painter );

    void drawLegend( QgsRenderContext &context );

    static void setNodeLegendStyle( QgsLayerTreeNode *node, QgsLegendStyle::Style style );

    static QgsLegendStyle::Style nodeLegendStyle( QgsLayerTreeNode *node, QgsLayerTreeModel *model );

  private:

#ifndef SIP_RUN

    class Nucleon
    {
      public:
        Nucleon() = default;

        QObject *item = nullptr;

        QSizeF symbolSize;

        QSizeF labelSize;

        QSizeF size;

        double labelXOffset = 0.0;
    };

    class Atom
    {
      public:

        QList<Nucleon> nucleons;

        QSizeF size = QSizeF( 0, 0 );

        int column = 0;
    };

    QSizeF paintAndDetermineSize( QPainter *painter = nullptr );

    QList<Atom> createAtomList( QgsLayerTreeGroup *parentGroup, bool splitLayer );

    void setColumns( QList<Atom> &atomList );

    QSizeF drawTitle( QPainter *painter = nullptr, QPointF point = QPointF(), Qt::AlignmentFlag halignment = Qt::AlignLeft, double legendWidth = 0 );

    double spaceAboveAtom( const Atom &atom );

    QSizeF drawAtom( const Atom &atom, QPainter *painter = nullptr, QPointF point = QPointF() );

    Nucleon drawSymbolItem( QgsLayerTreeModelLegendNode *symbolItem, QPainter *painter = nullptr, QPointF point = QPointF(), double labelXOffset = 0 );

    QSizeF drawLayerTitle( QgsLayerTreeLayer *nodeLayer, QPainter *painter = nullptr, QPointF point = QPointF() );

    QSizeF drawGroupTitle( QgsLayerTreeGroup *nodeGroup, QPainter *painter = nullptr, QPointF point = QPointF() );

    QSizeF paintAndDetermineSize( QgsRenderContext *context );

    QSizeF drawTitle( QgsRenderContext *context, QPointF point = QPointF(), Qt::AlignmentFlag halignment = Qt::AlignLeft, double legendWidth = 0 );

    QSizeF drawAtom( const Atom &atom, QgsRenderContext *rendercontext, QPointF point = QPointF() );

    Nucleon drawSymbolItem( QgsLayerTreeModelLegendNode *symbolItem, QgsRenderContext *context, QPointF point = QPointF(), double labelXOffset = 0 );

    QSizeF drawLayerTitle( QgsLayerTreeLayer *nodeLayer, QgsRenderContext *context, QPointF point = QPointF() );

    QSizeF drawGroupTitle( QgsLayerTreeGroup *nodeGroup, QgsRenderContext *context, QPointF point = QPointF() );

    QgsLegendStyle::Style nodeLegendStyle( QgsLayerTreeNode *node );

  private:
    QgsLayerTreeModel *mLegendModel = nullptr;

    QgsLegendSettings mSettings;

    QSizeF mLegendSize;

#endif
    QSizeF drawTitleInternal( QgsRenderContext *context, QPainter *painter, QPointF point, Qt::AlignmentFlag halignment, double legendWidth );
    QSizeF drawAtomInternal( const Atom &atom, QgsRenderContext *context, QPainter *painter, QPointF point );
    QgsLegendRenderer::Nucleon drawSymbolItemInternal( QgsLayerTreeModelLegendNode *symbolItem, QgsRenderContext *context, QPainter *painter, QPointF point, double labelXOffset );
    QSizeF drawLayerTitleInternal( QgsLayerTreeLayer *nodeLayer, QgsRenderContext *context, QPainter *painter, QPointF point );
    QSizeF drawGroupTitleInternal( QgsLayerTreeGroup *nodeGroup, QgsRenderContext *context, QPainter *painter, QPointF point );
    QSizeF paintAndDetermineSizeInternal( QgsRenderContext *context, QPainter *painter );
};

#endif // QGSLEGENDRENDERER_H