qgscategorizedsymbolrendererwidget.h

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/***************************************************************************
    qgscategorizedsymbolrendererwidget.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 QGSCATEGORIZEDSYMBOLRENDERERWIDGET_H
#define QGSCATEGORIZEDSYMBOLRENDERERWIDGET_H

#include "qgscategorizedsymbolrenderer.h"
#include "qgis_sip.h"
#include "qgsrendererwidget.h"
#include "qgsproxystyle.h"
#include <QStandardItem>


class QgsCategorizedSymbolRenderer;
class QgsRendererCategory;

#include "ui_qgscategorizedsymbolrendererwidget.h"
#include "qgis_gui.h"


#ifndef SIP_RUN

class GUI_EXPORT QgsCategorizedSymbolRendererModel : public QAbstractItemModel
{
    Q_OBJECT
  public:
    QgsCategorizedSymbolRendererModel( QObject *parent = nullptr );
    Qt::ItemFlags flags( const QModelIndex &index ) const override;
    Qt::DropActions supportedDropActions() const override;
    QVariant data( const QModelIndex &index, int role ) const override;
    bool setData( const QModelIndex &index, const QVariant &value, int role ) override;
    QVariant headerData( int section, Qt::Orientation orientation, int role ) const override;
    int rowCount( const QModelIndex &parent = QModelIndex() ) const override;
    int columnCount( const QModelIndex & = QModelIndex() ) const override;
    QModelIndex index( int row, int column, const QModelIndex &parent = QModelIndex() ) const override;
    QModelIndex parent( const QModelIndex &index ) const override;
    QStringList mimeTypes() const override;
    QMimeData *mimeData( const QModelIndexList &indexes ) const override;
    bool dropMimeData( const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent ) override;

    void setRenderer( QgsCategorizedSymbolRenderer *renderer );

    void addCategory( const QgsRendererCategory &cat );
    QgsRendererCategory category( const QModelIndex &index );
    void deleteRows( QList<int> rows );
    void removeAllRows();
    void sort( int column, Qt::SortOrder order = Qt::AscendingOrder ) override;
    void updateSymbology();

  signals:
    void rowsMoved();

  private:
    QgsCategorizedSymbolRenderer *mRenderer = nullptr;
    QString mMimeFormat;
};

class QgsCategorizedSymbolRendererViewStyle: public QgsProxyStyle
{
    Q_OBJECT

  public:
    explicit QgsCategorizedSymbolRendererViewStyle( QWidget *parent );

    void drawPrimitive( PrimitiveElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget = nullptr ) const override;
};


#endif

class GUI_EXPORT QgsCategorizedSymbolRendererWidget : public QgsRendererWidget, private Ui::QgsCategorizedSymbolRendererWidget, private QgsExpressionContextGenerator
{
    Q_OBJECT
  public:
    static QgsRendererWidget *create( QgsVectorLayer *layer, QgsStyle *style, QgsFeatureRenderer *renderer ) SIP_FACTORY;

    QgsCategorizedSymbolRendererWidget( QgsVectorLayer *layer, QgsStyle *style, QgsFeatureRenderer *renderer );
    ~QgsCategorizedSymbolRendererWidget() override;

    QgsFeatureRenderer *renderer() override;

    int matchToSymbols( QgsStyle *style );

  public slots:
    void changeCategorizedSymbol();
    void categoryColumnChanged( const QString &field );
    void categoriesDoubleClicked( const QModelIndex &idx );
    void addCategory();
    void addCategories();

    void applyColorRamp();

    void deleteCategories();
    void deleteAllCategories();

    void showSymbolLevels();

    void rowsMoved();

    void matchToSymbolsFromLibrary();

    void matchToSymbolsFromXml();

  private slots:

    void cleanUpSymbolSelector( QgsPanelWidget *container );
    void updateSymbolsFromWidget();
    void dataDefinedSizeLegend();

    void mergeSelectedCategories();

    void unmergeSelectedCategories();

    void showContextMenu( QPoint p );

  protected:

    void updateUiFromRenderer();

    void updateCategorizedSymbolIcon();

    // Called by virtual refreshSymbolView()
    void populateCategories();

    int currentCategoryRow();

    QList<int> selectedCategories();

    void changeSelectedSymbols();

    void changeCategorySymbol();
    void applyChangeToSymbol();

    QList<QgsSymbol *> selectedSymbols() override;
    QgsCategoryList selectedCategoryList();
    void refreshSymbolView() override;
    void keyPressEvent( QKeyEvent *event ) override;

  protected:
    std::unique_ptr< QgsCategorizedSymbolRenderer > mRenderer;

    std::unique_ptr< QgsSymbol > mCategorizedSymbol;

    QgsCategorizedSymbolRendererModel *mModel = nullptr;

  private:
    QString mOldClassificationAttribute;
    QgsCategoryList mCopyBuffer;
    QMenu *mContextMenu = nullptr;
    QAction *mMergeCategoriesAction = nullptr;
    QAction *mUnmergeCategoriesAction = nullptr;

    QgsExpressionContext createExpressionContext() const override;

    friend class TestQgsCategorizedRendererWidget;
};

#endif // QGSCATEGORIZEDSYMBOLRENDERERWIDGET_H