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

Classes
struct	ExpressionField

Public Types
typedef struct QgsExpressionFieldBuffer::ExpressionField	ExpressionField

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

Detailed Description

Buffers information about expression fields for a vector layer.

Member Typedef Documentation

QgsExpressionFieldBuffer::QgsExpressionFieldBuffer ( )

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

Add an expression to the buffer.

Parameters

exp	expression to add
fld	field to add

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

inline

void QgsExpressionFieldBuffer::readXml ( const QDomNode & layer_node )

Reads expressions from project file.

void QgsExpressionFieldBuffer::removeExpression ( int index )

Remove an expression from the buffer.

Parameters

index index of expression to remove

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

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

Saves expressions to xml under the layer node.

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