qgsfieldmappingwidget.h

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/***************************************************************************
  qgsfieldmappingwidget.h - QgsFieldMappingWidget
 
 ---------------------
 begin                : 16.3.2020
 copyright            : (C) 2020 by Alessandro Pasotti
 email                : elpaso at itopen dot it
 ***************************************************************************
 *                                                                         *
 *   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 QGSFIELDMAPPINGWIDGET_H
#define QGSFIELDMAPPINGWIDGET_H
 
#include <QWidget>
#include <QAbstractTableModel>
#include <QStyledItemDelegate>
#include <QPointer>
 
#include "qgis_gui.h"
#include "qgsfieldmappingmodel.h"
#include "qgspanelwidget.h"
 
class QTableView;
class QItemSelectionModel;
class QgsVectorLayer;
 
class GUI_EXPORT QgsFieldMappingWidget : public QgsPanelWidget
{
    Q_OBJECT
 
  public:
 
    explicit QgsFieldMappingWidget( QWidget *parent = nullptr,
                                    const QgsFields &sourceFields = QgsFields(),
                                    const QgsFields &destinationFields = QgsFields(),
                                    const QMap<QString, QString> &expressions = QMap<QString, QString>() );
 
    void setDestinationEditable( bool editable );
 
    bool destinationEditable() const;
 
    QgsFieldMappingModel *model() const;
 
    QList<QgsFieldMappingModel::Field> mapping() const;
 
    QMap< QString, QgsProperty > fieldPropertyMap() const;
 
    void setFieldPropertyMap( const QMap< QString, QgsProperty > &map );
 
    QItemSelectionModel *selectionModel();
 
    void setSourceFields( const QgsFields &sourceFields );
 
    void setSourceLayer( QgsVectorLayer *layer );
 
    QgsVectorLayer *sourceLayer();
 
    void setDestinationFields( const QgsFields &destinationFields,
                               const QMap<QString, QString> &expressions = QMap<QString, QString>() );
 
    void scrollTo( const QModelIndex &index ) const;
 
    void registerExpressionContextGenerator( const QgsExpressionContextGenerator *generator );
 
  signals:
 
    void changed();
 
  public slots:
 
    void appendField( const QgsField &field, const QString &expression = QString() );
 
    bool removeSelectedFields( );
 
    bool moveSelectedFieldsUp( );
 
    bool moveSelectedFieldsDown( );
 
  private:
 
    QTableView *mTableView = nullptr;
    QAbstractTableModel *mModel = nullptr;
 
    QPointer< QgsVectorLayer > mSourceLayer;
    void updateColumns();
    std::list<int> selectedRows( );
 
    class ExpressionDelegate: public QStyledItemDelegate
    {
 
      public:
 
        ExpressionDelegate( QObject *parent = nullptr );
 
        // QAbstractItemDelegate interface
        QWidget *createEditor( QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index ) const override;
        void setEditorData( QWidget *editor, const QModelIndex &index ) const override;
        void setModelData( QWidget *editor, QAbstractItemModel *model, const QModelIndex &index ) const override;
    };
 
    class TypeDelegate: public QStyledItemDelegate
    {
 
      public:
 
        TypeDelegate( QObject *parent = nullptr );
 
        // QAbstractItemDelegate interface
        QWidget *createEditor( QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index ) const override;
        void setEditorData( QWidget *editor, const QModelIndex &index ) const override;
        void setModelData( QWidget *editor, QAbstractItemModel *model, const QModelIndex &index ) const override;
    };
 
    friend class QgsAggregateMappingWidget;
 
};
 
 
#endif // QGSFIELDMAPPINGWIDGET_H