QgsExpressionFieldBuffer Class Reference

Buffers information about expression fields for a vector layer. More...

#include <qgsexpressionfieldbuffer.h>

Classes
struct	ExpressionField

Public Member Functions
	QgsExpressionFieldBuffer ()=default
	Constructor for QgsExpressionFieldBuffer. More...
void	addExpression (const QString &exp, const QgsField &fld)
	Add an expression to the buffer. More...
QList< QgsExpressionFieldBuffer::ExpressionField >	expressions () const
void	readXml (const QDomNode &layer_node)
	Reads expressions from project file. More...
void	removeExpression (int index)
	Remove an expression from the buffer. More...
void	renameExpression (int index, const QString &name)
	Renames an expression field at a given index. More...
void	updateExpression (int index, const QString &exp)
	Changes the expression at a given index. More...
void	updateFields (QgsFields &flds)
	Adds fields with the expressions buffered in this object to a QgsFields object. More...
void	writeXml (QDomNode &layer_node, QDomDocument &document) const
	Saves expressions to xml under the layer node. More...

Detailed Description

Buffers information about expression fields for a vector layer.

Since

QGIS 2.6

Definition at line 35 of file qgsexpressionfieldbuffer.h.

Constructor & Destructor Documentation

QgsExpressionFieldBuffer()

QgsExpressionFieldBuffer::QgsExpressionFieldBuffer ( )

default

Constructor for QgsExpressionFieldBuffer.

Member Function Documentation

addExpression()

void QgsExpressionFieldBuffer::addExpression	(	const QString &	exp,
		const QgsField &	fld
	)

Add an expression to the buffer.

Parameters

exp	expression to add
fld	field to add

Definition at line 23 of file qgsexpressionfieldbuffer.cpp.

expressions()

QList<QgsExpressionFieldBuffer::ExpressionField> QgsExpressionFieldBuffer::expressions ( ) const

inline

Definition at line 106 of file qgsexpressionfieldbuffer.h.

readXml()

void QgsExpressionFieldBuffer::readXml

(

const QDomNode &

layer_node

)

Reads expressions from project file.

Definition at line 66 of file qgsexpressionfieldbuffer.cpp.

removeExpression()

void QgsExpressionFieldBuffer::removeExpression

(

int

index

)

Remove an expression from the buffer.

Parameters

index

index of expression to remove

Definition at line 28 of file qgsexpressionfieldbuffer.cpp.

renameExpression()

void QgsExpressionFieldBuffer::renameExpression	(	int	index,
		const QString &	name
	)

Renames an expression field at a given index.

Parameters

index	The index of the expression to change
name	New name for field

Since

QGIS 3.0

Definition at line 33 of file qgsexpressionfieldbuffer.cpp.

updateExpression()

void QgsExpressionFieldBuffer::updateExpression	(	int	index,
		const QString &	exp
	)

Changes the expression at a given index.

Parameters

index	The index of the expression to change
exp	The new expression to set

Since

QGIS 2.9

Definition at line 38 of file qgsexpressionfieldbuffer.cpp.

updateFields()

void QgsExpressionFieldBuffer::updateFields

(

QgsFields &

flds

)

Adds fields with the expressions buffered in this object to a QgsFields object.

Parameters

flds	The fields to be updated

Definition at line 93 of file qgsexpressionfieldbuffer.cpp.

writeXml()

void QgsExpressionFieldBuffer::writeXml	(	QDomNode &	layer_node,
		QDomDocument &	document
	)		const

Saves expressions to xml under the layer node.

Definition at line 43 of file qgsexpressionfieldbuffer.cpp.

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

• /build/qgis-3.20.0+99unstable/src/core/qgsexpressionfieldbuffer.h
• /build/qgis-3.20.0+99unstable/src/core/qgsexpressionfieldbuffer.cpp