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 QJsonObject;
 
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; }
 
    Q_DECL_DEPRECATED void drawLegend( QPainter *painter ) SIP_DEPRECATED;
 
    void drawLegend( QgsRenderContext &context );
 
    QJsonObject exportLegendToJson( const QgsRenderContext &context );
 
    static void setNodeLegendStyle( QgsLayerTreeNode *node, QgsLegendStyle::Style style );
 
    static QgsLegendStyle::Style nodeLegendStyle( QgsLayerTreeNode *node, QgsLayerTreeModel *model );
 
  private:
 
#ifndef SIP_RUN
 
    class LegendComponent
    {
      public:
 
        LegendComponent() = default;
 
        QObject *item = nullptr;
 
        QSizeF symbolSize;
 
        QSizeF labelSize;
 
        QSizeF size;
 
        double labelXOffset = 0.0;
 
        double maxSiblingSymbolWidth = 0.0;
    };
 
    class LegendComponentGroup
    {
      public:
 
        QList<LegendComponent> components;
 
        QSizeF size = QSizeF( 0, 0 );
 
        int column = 0;
 
        bool placeColumnBreakBeforeGroup = false;
 
    };
 
    class ColumnContext
    {
      public:
 
        ColumnContext()
          : left( 0 )
          , right( 0 )
        {}
 
        double left = 0;
        double right = 0;
    };
 
    QList<LegendComponentGroup> createComponentGroupList( QgsLayerTreeGroup *parentGroup, QgsRenderContext &context );
 
    int setColumns( QList<LegendComponentGroup> &groupList );
 
    double spaceAboveGroup( const LegendComponentGroup &group );
 
    QJsonObject exportLegendToJson( const QgsRenderContext &context, QgsLayerTreeGroup *nodeGroup );
 
    QSizeF paintAndDetermineSize( QgsRenderContext &context );
 
    QSizeF drawTitle( QgsRenderContext &context, double top, Qt::AlignmentFlag halignment = Qt::AlignLeft, double legendWidth = 0 );
 
    QSizeF drawGroup( const LegendComponentGroup &group, QgsRenderContext &context, ColumnContext columnContext, double top = 0 );
 
    LegendComponent drawSymbolItem( QgsLayerTreeModelLegendNode *symbolItem, QgsRenderContext &context, ColumnContext columnContext, double top, double maxSiblingSymbolWidth = 0 );
 
    QSizeF drawLayerTitle( QgsLayerTreeLayer *nodeLayer, QgsRenderContext &context, ColumnContext columnContext = ColumnContext(), double top = 0 );
 
    QSizeF drawGroupTitle( QgsLayerTreeGroup *nodeGroup, QgsRenderContext &context, ColumnContext columnContext = ColumnContext(), double top = 0 );
 
    QgsLegendStyle::Style nodeLegendStyle( QgsLayerTreeNode *node );
 
    QgsLayerTreeModel *mLegendModel = nullptr;
 
    QgsLegendSettings mSettings;
 
    QSizeF mLegendSize;
 
#endif
 
    void widthAndOffsetForTitleText( const Qt::AlignmentFlag halignment, double legendWidth, double &width, double &offset );
};
 
#endif // QGSLEGENDRENDERER_H