QgsFieldCalculator Class Reference

A dialog class that provides calculation of new fields using existing fields, values and a set of operators. More...

#include <qgsfieldcalculator.h>

Inheritance diagram for QgsFieldCalculator:

Public Slots
void	accept () override

Public Member Functions
	QgsFieldCalculator (QgsVectorLayer *vl, QWidget *parent=nullptr)
int	changedAttributeId () const
	Returns the field index of the field for which new attribute values were calculated.

Friends
class	TestQgsFieldCalculator

Detailed Description

A dialog class that provides calculation of new fields using existing fields, values and a set of operators.

Sample usage of the QgsFieldCalculator class:

uri = "point?crs=epsg:4326&field=id:integer"
layer = QgsVectorLayer(uri, "Scratch point layer",  "memory")
layer.startEditing()
dialog = QgsFieldCalculator(layer)
dialog.exec()

Definition at line 43 of file qgsfieldcalculator.h.

Constructor & Destructor Documentation

QgsFieldCalculator()

QgsFieldCalculator::QgsFieldCalculator	(	QgsVectorLayer *	vl,
		QWidget *	parent = nullptr
	)

Definition at line 48 of file qgsfieldcalculator.cpp.

Member Function Documentation

accept

void QgsFieldCalculator::accept ( )

overrideslot

Definition at line 176 of file qgsfieldcalculator.cpp.

changedAttributeId()

int QgsFieldCalculator::changedAttributeId ( ) const

inline

Returns the field index of the field for which new attribute values were calculated.

Returns

The field index if attribute values were calculated or -1, e.g. in case of geometry changes.

Definition at line 54 of file qgsfieldcalculator.h.

Friends And Related Symbol Documentation

TestQgsFieldCalculator

friend class TestQgsFieldCalculator

friend

Definition at line 96 of file qgsfieldcalculator.h.

---

The documentation for this class was generated from the following files:

• /build/qgis-3.41.0+git20241122+3440c17df1d+99sid/src/gui/vector/qgsfieldcalculator.h
• /build/qgis-3.41.0+git20241122+3440c17df1d+99sid/src/gui/vector/qgsfieldcalculator.cpp