A container class for data source field mapping or expression. More...

Public Member Functions
	QgsDataDefined (bool active=false, bool useexpr=false, const QString &expr=QString(), const QString &field=QString())
	Construct a new data defined object.
	~QgsDataDefined ()
bool	isActive () const
void	setActive (bool active)
bool	useExpression () const
void	setUseExpression (bool use)
QString	expressionString () const
void	setExpressionString (const QString &expr)
QMap< QString, QVariant >	expressionParams () const
void	setExpressionParams (QMap< QString, QVariant > params)
void	insertExpressionParam (QString key, QVariant param)
bool	prepareExpression (QgsVectorLayer *layer)
bool	expressionIsPrepared () const
QgsExpression *	expression ()
QStringList	referencedColumns (QgsVectorLayer *layer)
QString	field () const
void	setField (const QString &field)
QMap< QString, QString >	toMap ()

Detailed Description

A container class for data source field mapping or expression.

Constructor & Destructor Documentation

QgsDataDefined::QgsDataDefined	(	bool	active = `false`,
		bool	useexpr = `false`,
		const QString &	expr = `QString()`,
		const QString &	field = `QString()`
	)

Construct a new data defined object.

Parameters

active	Whether the current data defined is active
useexpr	Whether to use expression instead of field
expr	Expression string
field	Field name string

QgsDataDefined::~QgsDataDefined ( )

QgsExpression* QgsDataDefined::expression ( )

inline

bool QgsDataDefined::expressionIsPrepared ( ) const

inline

QMap<QString, QVariant> QgsDataDefined::expressionParams ( ) const

inline

QString QgsDataDefined::expressionString ( ) const

inline

QString QgsDataDefined::field ( ) const

inline

void QgsDataDefined::insertExpressionParam	(	QString	key,
		QVariant	param
	)

bool QgsDataDefined::isActive ( ) const

inline

bool QgsDataDefined::prepareExpression ( QgsVectorLayer * layer )

QStringList QgsDataDefined::referencedColumns ( QgsVectorLayer * layer )

void QgsDataDefined::setActive ( bool active )

inline

void QgsDataDefined::setExpressionParams ( QMap< QString, QVariant > params )

inline

void QgsDataDefined::setExpressionString ( const QString & expr )

void QgsDataDefined::setField ( const QString & field )

inline

void QgsDataDefined::setUseExpression ( bool use )

inline

QMap< QString, QString > QgsDataDefined::toMap ( )

bool QgsDataDefined::useExpression ( ) const

inline

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