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62 lines
1.8 KiB
Plaintext
62 lines
1.8 KiB
Plaintext
/** \ingroup core
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* \class QgsDataDefined
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* A container class for data source field mapping or expression.
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*/
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class QgsDataDefined
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{
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%TypeHeaderCode
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#include <qgsdatadefined.h>
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%End
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public:
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/**
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* Construct a new data defined object
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*
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* @param active Whether the current data defined is active
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* @param useexpr Whether to use expression instead of field
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* @param expr Expression string
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* @param field Field name string
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*/
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QgsDataDefined( bool active = false,
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bool useexpr = false,
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const QString& expr = QString(),
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const QString& field = QString() );
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~QgsDataDefined();
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/**Returns whether the data defined container is set to all the default
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* values, ie, disabled, with empty expression and no assigned field
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* @returns true if data defined container is set to default values
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* @note added in QGIS 2.7
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*/
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bool hasDefaultValues() const;
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bool isActive() const;
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void setActive( bool active );
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bool useExpression() const;
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void setUseExpression( bool use );
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QString expressionString() const;
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void setExpressionString( const QString& expr );
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// @note not available in python bindings
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//QMap<QString, QVariant> expressionParams() const;
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// @note not available in python bindings
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//void setExpressionParams( QMap<QString, QVariant> params );
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void insertExpressionParam( QString key, QVariant param );
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bool prepareExpression( QgsVectorLayer* layer );
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bool expressionIsPrepared() const;
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QgsExpression* expression();
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QStringList referencedColumns( QgsVectorLayer* layer );
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QString field() const;
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void setField( const QString& field );
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// @note not available in python bindings
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//QMap< QString, QString > toMap();
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};
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