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/** \ingroup core
* \class QgsDataDefined
* A container class for data source field mapping or expression.
* @note added in QGIS 1.9
*/
class QgsDataDefined
{
%TypeHeaderCode
#include <qgsdatadefined.h>
%End
public:
/**
* Construct a new data defined object
*
* @param active Whether the current data defined is active
* @param useexpr Whether to use expression instead of field
* @param expr Expression string
* @param field Field name string
*/
QgsDataDefined( bool active = false,
bool useexpr = false,
const QString& expr = QString(),
const QString& field = QString() );
~QgsDataDefined();
bool isActive() const;
void setActive( bool active );
bool useExpression() const;
void setUseExpression( bool use );
QString expressionString() const;
void setExpressionString( const QString& expr );
// @note not available in python bindings
//QMap<QString, QVariant> expressionParams() const;
// @note not available in python bindings
//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 );
// @note not available in python bindings
//QMap< QString, QString > toMap();
};
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