QgsVectorLayerSelectedFeatureSource Class Reference

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

#include <qgsvectorlayerfeatureiterator.h>

Inheritance diagram for QgsVectorLayerSelectedFeatureSource:

Public Member Functions
	QgsVectorLayerSelectedFeatureSource (const QgsVectorLayerSelectedFeatureSource &other)=delete
	QgsVectorLayerSelectedFeatureSource (QgsVectorLayer *layer)
	Constructor for QgsVectorLayerSelectedFeatureSource, for selected features from the specified layer.
QgsExpressionContextScope *	createExpressionContextScope () const override
	This method needs to be reimplemented in all classes which implement this interface and return an expression context scope.
long long	featureCount () const override
	Returns the number of features contained in the source, or -1 if the feature count is unknown.
QgsFields	fields () const override
	Returns the fields associated with features in the source.
QgsFeatureIterator	getFeatures (const QgsFeatureRequest &request=QgsFeatureRequest()) const override
	Returns an iterator for the features in the source.
Qgis::SpatialIndexPresence	hasSpatialIndex () const override
	Returns an enum value representing the presence of a valid spatial index on the source, if it can be determined.
QgsVectorLayerSelectedFeatureSource &	operator== (const QgsVectorLayerSelectedFeatureSource &other)=delete
QgsCoordinateReferenceSystem	sourceCrs () const override
	Returns the coordinate reference system for features in the source.
QString	sourceName () const override
	Returns a friendly display name for the source.
Qgis::WkbType	wkbType () const override
	Returns the geometry type for features returned by this source.
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.
virtual Qgis::FeatureAvailability	hasFeatures () const
	Determines if there are any features available in the source.
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.
virtual QVariant	maximumValue (int fieldIndex) const
	Returns the maximum value for an attribute column or an invalid variant in case of error.
virtual QVariant	minimumValue (int fieldIndex) const
	Returns the minimum value for an attribute column or an invalid variant in case of error.
virtual QgsRectangle	sourceExtent () const
	Returns the extent of all geometries from the source.
virtual QgsBox3D	sourceExtent3D () const
	Returns the 3D extent of all geometries from the source.
virtual QSet< QVariant >	uniqueValues (int fieldIndex, int limit=-1) const
	Returns the set of unique values contained within the specified fieldIndex from this source.
Public Member Functions inherited from QgsExpressionContextScopeGenerator
virtual	~QgsExpressionContextScopeGenerator ()=default

Detailed Description

QgsFeatureSource subclass for the selected features from a QgsVectorLayer.

Definition at line 369 of file qgsvectorlayerfeatureiterator.h.

Constructor & Destructor Documentation

QgsVectorLayerSelectedFeatureSource() [1/2]

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 1356 of file qgsvectorlayerfeatureiterator.cpp.

QgsVectorLayerSelectedFeatureSource() [2/2]

QgsVectorLayerSelectedFeatureSource::QgsVectorLayerSelectedFeatureSource ( const QgsVectorLayerSelectedFeatureSource &  other )

delete

Member Function Documentation

createExpressionContextScope()

QgsExpressionContextScope * QgsVectorLayerSelectedFeatureSource::createExpressionContextScope ( ) const

overridevirtual

This method needs to be reimplemented in all classes which implement this interface and return an expression context scope.

Implements QgsExpressionContextScopeGenerator.

Definition at line 1413 of file qgsvectorlayerfeatureiterator.cpp.

featureCount()

long long QgsVectorLayerSelectedFeatureSource::featureCount ( ) const

overridevirtual

Returns the number of features contained in the source, or -1 if the feature count is unknown.

Implements QgsFeatureSource.

Definition at line 1403 of file qgsvectorlayerfeatureiterator.cpp.

fields()

QgsFields QgsVectorLayerSelectedFeatureSource::fields ( ) const

overridevirtual

Returns the fields associated with features in the source.

Implements QgsFeatureSource.

Definition at line 1393 of file qgsvectorlayerfeatureiterator.cpp.

getFeatures()

QgsFeatureIterator QgsVectorLayerSelectedFeatureSource::getFeatures ( const QgsFeatureRequest &  request = QgsFeatureRequest() ) const

overridevirtual

Returns an iterator for the features in the source.

An optional request can be used to optimise the returned iterator, eg by restricting the returned attributes or geometry.

Implements QgsFeatureSource.

Definition at line 1364 of file qgsvectorlayerfeatureiterator.cpp.

hasSpatialIndex()

Qgis::SpatialIndexPresence QgsVectorLayerSelectedFeatureSource::hasSpatialIndex ( ) const

overridevirtual

Returns an enum value representing the presence of a valid spatial index on the source, if it can be determined.

If QgsFeatureSource::SpatialIndexUnknown is returned then the presence of an index cannot be determined.

Since

QGIS 3.10.1

Reimplemented from QgsFeatureSource.

Definition at line 1421 of file qgsvectorlayerfeatureiterator.cpp.

operator==()

QgsVectorLayerSelectedFeatureSource & QgsVectorLayerSelectedFeatureSource::operator== ( const QgsVectorLayerSelectedFeatureSource &  other )

delete

sourceCrs()

QgsCoordinateReferenceSystem QgsVectorLayerSelectedFeatureSource::sourceCrs ( ) const

overridevirtual

Returns the coordinate reference system for features in the source.

Implements QgsFeatureSource.

Definition at line 1388 of file qgsvectorlayerfeatureiterator.cpp.

sourceName()

QString QgsVectorLayerSelectedFeatureSource::sourceName ( ) const

overridevirtual

Returns a friendly display name for the source.

The returned value can be an empty string.

Implements QgsFeatureSource.

Definition at line 1408 of file qgsvectorlayerfeatureiterator.cpp.

wkbType()

Qgis::WkbType QgsVectorLayerSelectedFeatureSource::wkbType ( ) const

overridevirtual

Returns the geometry type for features returned by this source.

Implements QgsFeatureSource.

Definition at line 1398 of file qgsvectorlayerfeatureiterator.cpp.

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The documentation for this class was generated from the following files:

• /build/qgis-3.41.0+git20241116+25ec5511245+99sid/src/core/vector/qgsvectorlayerfeatureiterator.h
• /build/qgis-3.41.0+git20241116+25ec5511245+99sid/src/core/vector/qgsvectorlayerfeatureiterator.cpp