mirror of
https://github.com/qgis/QGIS.git
synced 2025-11-03 00:14:12 -05:00
c49b5b777f
Rationale: - there was a lot of large objects passed by value, so potentially there's a speed bump from this - even for implicitly shared classes like QString/QList there's still a (small) cost for copying the objects when there's no reason to - it's the right thing to do!
59 lines
1.4 KiB
Plaintext
59 lines
1.4 KiB
Plaintext
class QgsExpressionFieldBuffer
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{
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%TypeHeaderCode
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#include <qgsexpressionfieldbuffer.h>
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%End
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public:
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class ExpressionField
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{
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ExpressionField();
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ExpressionField( const QString& exp, const QgsField& fld );
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};
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QgsExpressionFieldBuffer();
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/**
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* Add an expression to the buffer
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*
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* @param exp expression to add
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* @param fld field to add
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*/
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void addExpression( const QString& exp, const QgsField& fld );
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/**
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* Remove an expression from the buffer
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*
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* @param index index of expression to remove
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*/
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void removeExpression( int index );
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/**
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* Changes the expression at a given index
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*
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* @param index The index of the expression to change
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* @param exp The new expression to set
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*
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* @note added in 2.9
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*/
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void updateExpression( int index, const QString& exp );
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/**
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* Saves expressions to xml under the layer node
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*/
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void writeXml( QDomNode& layer_node, QDomDocument& document ) const;
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/**
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* Reads expressions from project file
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*/
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void readXml( const QDomNode& layer_node );
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/**
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* Adds fields with the expressions buffered in this object to a QgsFields object
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*
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* @param flds The fields to be updated
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*/
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void updateFields( QgsFields& flds );
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const QList<QgsExpressionFieldBuffer::ExpressionField>& expressions() const;
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};
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