QgsFeatureSource subclass for the selected features from a QgsVectorLayer. More...

#include <qgsvectorlayerfeatureiterator.h>

Inheritance diagram for QgsVectorLayerSelectedFeatureSource:

Public Member Functions
	QgsVectorLayerSelectedFeatureSource (QgsVectorLayer *layer)
	Constructor for QgsVectorLayerSelectedFeatureSource, for selected features from the specified layer. More...

QgsExpressionContextScope *	createExpressionContextScope () const override
	This method needs to be reimplemented in all classes which implement this interface and return an expression context scope. More...

long	featureCount () const override
	Returns the number of features contained in the source, or -1 if the feature count is unknown. More...

QgsFields	fields () const override
	Returns the fields associated with features in the source. More...

QgsFeatureIterator	getFeatures (const QgsFeatureRequest &request=QgsFeatureRequest()) const override
	Returns an iterator for the features in the source. More...

SpatialIndexPresence	hasSpatialIndex () const override
	Returns an enum value representing the presence of a valid spatial index on the source, if it can be determined. More...

QgsCoordinateReferenceSystem	sourceCrs () const override
	Returns the coordinate reference system for features in the source. More...

QString	sourceName () const override
	Returns a friendly display name for the source. More...

QgsWkbTypes::Type	wkbType () const override
	Returns the geometry type for features returned by this source. More...

Public Member Functions inherited from QgsFeatureSource
virtual	~QgsFeatureSource ()=default

virtual QgsFeatureIds	allFeatureIds () const
	Returns a list of all feature IDs for features present in the source. More...

virtual FeatureAvailability	hasFeatures () const
	Determines if there are any features available in the source. More...

QgsVectorLayer *	materialize (const QgsFeatureRequest &request, QgsFeedback *feedback=nullptr)
	Materializes a request (query) made against this feature source, by running it over the source and returning a new memory based vector layer containing the result. More...

virtual QVariant	maximumValue (int fieldIndex) const
	Returns the maximum value for an attribute column or an invalid variant in case of error. More...

virtual QVariant	minimumValue (int fieldIndex) const
	Returns the minimum value for an attribute column or an invalid variant in case of error. More...

virtual QgsRectangle	sourceExtent () const
	Returns the extent of all geometries from the source. More...

virtual QSet< QVariant >	uniqueValues (int fieldIndex, int limit=-1) const
	Returns the set of unique values contained within the specified fieldIndex from this source. More...

Public Member Functions inherited from QgsExpressionContextScopeGenerator
virtual	~QgsExpressionContextScopeGenerator ()=default

Additional Inherited Members
Public Types inherited from QgsFeatureSource
enum	FeatureAvailability { NoFeaturesAvailable, FeaturesAvailable, FeaturesMaybeAvailable }
	Possible return value for hasFeatures() to determine if a source is empty. More...

enum	SpatialIndexPresence { SpatialIndexUnknown = 0, SpatialIndexNotPresent = 1, SpatialIndexPresent = 2 }
	Enumeration of spatial index presence states. More...

Detailed Description

QgsFeatureSource subclass for the selected features from a QgsVectorLayer.

Since: QGIS 3.0

Definition at line 304 of file qgsvectorlayerfeatureiterator.h.

Constructor & Destructor Documentation

◆ QgsVectorLayerSelectedFeatureSource()

QgsVectorLayerSelectedFeatureSource::QgsVectorLayerSelectedFeatureSource ( QgsVectorLayer * layer )

Constructor for QgsVectorLayerSelectedFeatureSource, for selected features from the specified layer.

The currently selected feature IDs are stored, so change to the layer selection after constructing the QgsVectorLayerSelectedFeatureSource will not be reflected.

Definition at line 1219 of file qgsvectorlayerfeatureiterator.cpp.