88 std::unique_ptr<QgsVectorLayerExporterTask>
createExporterTask(
const QVariantMap &extraProviderOptions = QVariantMap() );
93 void sourceLayerComboChanged();
96 void loadFieldsFromLayer();
102 std::unique_ptr< QgsVectorLayer > mOwnedSource;
103 QPointer< QgsVectorLayer > mSourceLayer;
105 int mBlockSourceLayerChanges = 0;
107 std::unique_ptr< QgsAbstractDatabaseProviderConnection > mConnection;
Abstract interface for generating an expression context.
virtual QgsExpressionContext createExpressionContext() const =0
This method needs to be reimplemented in all classes which implement this interface and return an exp...
Expression contexts are used to encapsulate the parameters around which a QgsExpression should be eva...