qgsfieldcalculator.h

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/***************************************************************************
    qgsfieldcalculator.h
    ---------------------
    begin                : September 2009
    copyright            : (C) 2009 by Marco Hugentobler
    email                : marco at hugis dot net
 ***************************************************************************
 *                                                                         *
 *   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 QGSFIELDCALCULATOR_H
#define QGSFIELDCALCULATOR_H
 
#include "ui_qgsfieldcalculatorbase.h"
 
#include "qgis_gui.h"
#include "qgsfields.h"
#include "qgshelp.h"
 
class QgsVectorLayer;
class QgsMessageBar;

class GUI_EXPORT QgsFieldCalculator : public QDialog, private Ui::QgsFieldCalculatorBase
{
    Q_OBJECT
  public:
    QgsFieldCalculator( QgsVectorLayer *vl, QWidget *parent = nullptr, int fieldIndex = -1 );

    int changedAttributeId() const { return mAttributeId; }
 
  public slots:
    void accept() override;
 
  private slots:
    void mNewFieldGroupBox_toggled( bool on );
    void mUpdateExistingGroupBox_toggled( bool on );
    void mCreateVirtualFieldCheckbox_stateChanged( int state );
    void mOutputFieldNameLineEdit_textChanged( const QString &text );
    void mOutputFieldTypeComboBox_activated( int index );
    void mExistingFieldComboBox_currentIndexChanged( const int index );

    void setDialogButtonState();
    void setPrecisionMinMax();
    void showHelp();
    void calculate();
    void pushMessage( const QString &text, Qgis::MessageLevel level = Qgis::MessageLevel::Info, int duration = -1 );
 
  private:
    QgsFieldCalculator();
    void populateFields( int fieldIndex );
    void populateOutputFieldTypes();
 
    QgsVectorLayer *mVectorLayer = nullptr;
 
    bool mCanAddAttribute = false;
    bool mCanChangeAttributeValue = false;

    QgsField fieldDefinition();

    int mAttributeId;
 
    QgsMessageBar *mMsgBar = nullptr;
 
    friend class TestQgsFieldCalculator;
};
 
#endif // QGSFIELDCALCULATOR_H