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de48dad6e9
Cycle would otherwise cause infinite loop when updating fields and it does not make sense
60 lines
2.2 KiB
Plaintext
60 lines
2.2 KiB
Plaintext
class QgsVectorLayerJoinBuffer : QObject
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{
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%TypeHeaderCode
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#include <qgsvectorlayerjoinbuffer.h>
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%End
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public:
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QgsVectorLayerJoinBuffer( QgsVectorLayer* layer = 0 );
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~QgsVectorLayerJoinBuffer();
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/**Joins another vector layer to this layer
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@param joinInfo join object containing join layer id, target and source field
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@return (since 2.6) whether the join was successfully added */
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bool addJoin( const QgsVectorJoinInfo& joinInfo );
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/**Removes a vector layer join*/
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void removeJoin( const QString& joinLayerId );
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/**Updates field map with joined attributes
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@param fields map to append joined attributes
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*/
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void updateFields( QgsFields& fields );
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/**Calls cacheJoinLayer() for all vector joins*/
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void createJoinCaches();
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/**Saves mVectorJoins to xml under the layer node*/
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void writeXml( QDomNode& layer_node, QDomDocument& document ) const;
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/**Reads joins from project file*/
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void readXml( const QDomNode& layer_node );
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/**Quick way to test if there is any join at all*/
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bool containsJoins() const;
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const QList< QgsVectorJoinInfo >& vectorJoins() const;
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/**Finds the vector join for a layer field index.
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@param index this layers attribute index
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@param fields fields of the vector layer (including joined fields)
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@param sourceFieldIndex Output: field's index in source layer */
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const QgsVectorJoinInfo* joinForFieldIndex( int index, const QgsFields& fields, int& sourceFieldIndex /Out/ ) const;
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//! Find out what is the first index of the join within fields. Returns -1 if join is not present
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//! @note added in 2.6
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int joinedFieldsOffset( const QgsVectorJoinInfo* info, const QgsFields& fields );
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//! Return a vector of indices for use in join based on field names from the layer
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//! @note added in 2.6
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static QVector<int> joinSubsetIndices( QgsVectorLayer* joinLayer, const QStringList& joinFieldsSubset );
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//! Create a copy of the join buffer
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//! @note added in 2.6
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QgsVectorLayerJoinBuffer* clone() const /Factory/;
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signals:
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//! Emitted whenever the list of joined fields changes (e.g. added join or joined layer's fields change)
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//! @note added in 2.6
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void joinedFieldsChanged();
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};
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