Provides a list of features based on filter conditions. More...

#include <qgsfeaturepickermodelbase.h>

Inheritance diagram for QgsFeaturePickerModelBase:

[legend]

Public Types
enum class	CustomRole : int { IdentifierValue = Qt::UserRole , IdentifierValues , Value , Feature , FeatureId }
	Extra roles that can be used to fetch data from this model. More...

Signals
void	allowNullChanged ()
	Add a NULL entry to the list.

void	beginUpdate ()
	Notification that the model is about to be changed because a job was completed.

void	currentFeatureChanged ()
	Emitted when the current feature in the model has changed This emitted both when the extra value changes and when the extra value status changes.

void	displayExpressionChanged ()
	The display expression will be used for.

void	endUpdate ()
	Notification that the model change is finished.

void	extraIdentifierValueChanged ()
	Allows specifying one value that does not need to match the filter criteria but will still be available in the model.

void	extraIdentifierValueIndexChanged (int index)
	The index at which the extra identifier value is available within the model.

void	extraValueDoesNotExistChanged (bool found)
	Notification whether the model has found a feature tied to the extraIdentifierValue or not.

void	fetchGeometryChanged ()
	Emitted when the fetching of the geometry changes.

void	fetchLimitChanged ()
	Emitted when the fetching limit for the feature request changes.

void	filterExpressionChanged ()
	An additional filter expression to apply, next to the filterValue.

void	filterJobCompleted ()
	Indicates that a filter job has been completed and new data may be available.

void	filterValueChanged ()
	This value will be used to filter the features available from this model.

void	isLoadingChanged ()
	Indicator if the model is currently performing any feature iteration in the background.

void	sourceLayerChanged ()
	The source layer from which features will be fetched.

Public Member Functions
	QgsFeaturePickerModelBase (QObject *parent=nullptr)
	Create a new QgsFeaturePickerModelBase, optionally specifying a parent.

	~QgsFeaturePickerModelBase () override

bool	allowNull () const
	Add a NULL entry to the list.

int	columnCount (const QModelIndex &parent) const override

QVariant	data (const QModelIndex &index, int role) const override

QString	displayExpression () const
	The display expression will be used for.

int	extraIdentifierValueIndex () const
	The index at which the extra identifier value is available within the model.

bool	extraValueDoesNotExist () const
	Flag indicating that the extraIdentifierValue does not exist in the data.

bool	fetchGeometry () const
	Returns if the geometry is fetched.

int	fetchLimit () const
	Returns the feature request fetch limit.

QString	filterExpression () const
	An additional filter expression to apply, next to the filterValue.

QString	filterValue () const
	This value will be used to filter the features available from this model.

QModelIndex	index (int row, int column, const QModelIndex &parent) const override

bool	isLoading () const
	Indicator if the model is currently performing any feature iteration in the background.

QModelIndex	parent (const QModelIndex &child) const override

int	rowCount (const QModelIndex &parent) const override

void	setAllowNull (bool allowNull)
	Add a NULL entry to the list.

void	setDisplayExpression (const QString &displayExpression)
	The display expression will be used for.

virtual void	setExtraIdentifierValueToNull ()=0
	Allows specifying one value that does not need to match the filter criteria but will still be available in the model as NULL value(s).

void	setFetchGeometry (bool fetchGeometry)
	Defines if the geometry will be fetched.

void	setFetchLimit (int fetchLimit)
	Defines the feature request fetch limit If set to 0, no limit is applied when fetching.

void	setFilterExpression (const QString &filterExpression)
	An additional filter expression to apply, next to the filterValue.

void	setFilterValue (const QString &filterValue)
	This value will be used to filter the features available from this model.

void	setSourceLayer (QgsVectorLayer *sourceLayer)
	The source layer from which features will be fetched.

QgsVectorLayer *	sourceLayer () const
	The source layer from which features will be fetched.

Protected Member Functions
virtual bool	compareEntries (const QgsFeatureExpressionValuesGatherer::Entry &a, const QgsFeatureExpressionValuesGatherer::Entry &b) const =0
	Returns `true` if the 2 entries refers to the same feature.

virtual QgsFeatureExpressionValuesGatherer::Entry	createEntry (const QVariant &identifier) const =0
	Creates an entry with just the identifier so the feature can be retrieved in a next iteration.

virtual QgsFeatureExpressionValuesGatherer *	createValuesGatherer (const QgsFeatureRequest &request) const =0
	Creates the value gatherer.

virtual QVariant	entryIdentifier (const QgsFeatureExpressionValuesGatherer::Entry &entry) const =0
	Returns the identifier of the given entry.

QVariant	extraIdentifierValue () const
	Allows specifying one value that does not need to match the filter criteria but will still be available in the model.

virtual bool	identifierIsNull (const QVariant &identifier) const =0
	Returns `true` if the entry is null The identifier can be either the feature ID or the list of identifier fields.

virtual QVariant	nullIdentifier () const =0
	Returns a null identifier.

virtual QSet< QString >	requestedAttributes () const
	Returns the attributes to be fetched in the request.

virtual void	requestToReloadCurrentFeature (QgsFeatureRequest &request)=0
	Update the request to match the current feature to be reloaded.

void	setExtraIdentifierValue (const QVariant &extraIdentifierValue)
	Allows specifying one value that does not need to match the filter criteria but will still be available in the model.

void	setExtraIdentifierValueUnguarded (const QVariant &identifierValue)
	This will set the identifier value to be set in the model even if it doesn't exist currently in the data.

Protected Attributes
QVector< QgsFeatureExpressionValuesGatherer::Entry >	mEntries

QVariant	mExtraIdentifierValue
	The current identifier value.

int	mExtraValueIndex = -1
	The current index.

Properties
bool	allowNull

QString	displayExpression

int	extraIdentifierValueIndex

bool	fetchGeometry

int	fetchLimit

QString	filterExpression

QString	filterValue

QgsVectorLayer *	sourceLayer

Friends
class	TestQgsFeatureListComboBox

Detailed Description

Provides a list of features based on filter conditions.

Features are fetched asynchronously.

Since: QGIS 3.14

Definition at line 32 of file qgsfeaturepickermodelbase.h.

Member Enumeration Documentation

◆ CustomRole

enum class QgsFeaturePickerModelBase::CustomRole : int

strong

Extra roles that can be used to fetch data from this model.

Note: Prior to QGIS 3.36 this was available as QgsFeaturePickerModelBase::Role

Since: QGIS 3.36

Enumerator
IdentifierValue	Used to retrieve the identifier value (primary key) of a feature. Deprecated: QGIS 3.40. Use IdentifierValuesRole instead.
IdentifierValues	Used to retrieve the identifierValues (primary keys) of a feature.
Value	Used to retrieve the displayExpression of a feature.
Feature	Used to retrieve the feature, it might be incomplete if the request doesn't fetch all attributes or geometry.
FeatureId	Used to retrieve the id of a feature.

Definition at line 55 of file qgsfeaturepickermodelbase.h.

Constructor & Destructor Documentation

◆ QgsFeaturePickerModelBase()

QgsFeaturePickerModelBase::QgsFeaturePickerModelBase ( QObject * parent = nullptr )

explicit

Create a new QgsFeaturePickerModelBase, optionally specifying a parent.

Definition at line 24 of file qgsfeaturepickermodelbase.cpp.

◆ ~QgsFeaturePickerModelBase()

QgsFeaturePickerModelBase::~QgsFeaturePickerModelBase ( )

override

Definition at line 37 of file qgsfeaturepickermodelbase.cpp.

Member Function Documentation

◆ allowNull()

bool QgsFeaturePickerModelBase::allowNull ( ) const

Add a NULL entry to the list.

Definition at line 550 of file qgsfeaturepickermodelbase.cpp.

◆ allowNullChanged

void QgsFeaturePickerModelBase::allowNullChanged ( )

signal

Add a NULL entry to the list.

◆ beginUpdate

void QgsFeaturePickerModelBase::beginUpdate ( )

signal

Notification that the model is about to be changed because a job was completed.

◆ columnCount()

int QgsFeaturePickerModelBase::columnCount ( const QModelIndex & parent ) const

inlineoverride

Definition at line 115 of file qgsfeaturepickermodelbase.h.

◆ compareEntries()

virtual bool QgsFeaturePickerModelBase::compareEntries	(	const QgsFeatureExpressionValuesGatherer::Entry &	a,
		const QgsFeatureExpressionValuesGatherer::Entry &	b
	)		const

protectedpure virtual

Returns true if the 2 entries refers to the same feature.

◆ createEntry()

virtual QgsFeatureExpressionValuesGatherer::Entry QgsFeaturePickerModelBase::createEntry ( const QVariant & identifier ) const

protectedpure virtual

Creates an entry with just the identifier so the feature can be retrieved in a next iteration.

◆ createValuesGatherer()

virtual QgsFeatureExpressionValuesGatherer * QgsFeaturePickerModelBase::createValuesGatherer ( const QgsFeatureRequest & request ) const

protectedpure virtual

Creates the value gatherer.

◆ currentFeatureChanged

void QgsFeaturePickerModelBase::currentFeatureChanged ( )

signal

Emitted when the current feature in the model has changed This emitted both when the extra value changes and when the extra value status changes.

It allows being notified when the feature is fetched after the extra value has been set.

Since: QGIS 3.16.5

◆ data()

QVariant QgsFeaturePickerModelBase::data	(	const QModelIndex &	index,
		int	role
	)		const

override

Definition at line 151 of file qgsfeaturepickermodelbase.cpp.

◆ displayExpression()

QString QgsFeaturePickerModelBase::displayExpression ( ) const

The display expression will be used for.

displaying values in the combobox
filtering based on filterValue

Definition at line 67 of file qgsfeaturepickermodelbase.cpp.

◆ displayExpressionChanged

void QgsFeaturePickerModelBase::displayExpressionChanged ( )

signal

The display expression will be used for.

displaying values in the combobox
filtering based on filterValue

◆ endUpdate

void QgsFeaturePickerModelBase::endUpdate ( )

signal

Notification that the model change is finished.

Will always be emitted in sync with beginUpdate.

◆ entryIdentifier()

virtual QVariant QgsFeaturePickerModelBase::entryIdentifier ( const QgsFeatureExpressionValuesGatherer::Entry & entry ) const

protectedpure virtual

Returns the identifier of the given entry.

◆ extraIdentifierValue()

QVariant QgsFeaturePickerModelBase::extraIdentifierValue ( ) const

protected

Allows specifying one value that does not need to match the filter criteria but will still be available in the model.

Definition at line 123 of file qgsfeaturepickermodelbase.cpp.

◆ extraIdentifierValueChanged

void QgsFeaturePickerModelBase::extraIdentifierValueChanged ( )

signal

Allows specifying one value that does not need to match the filter criteria but will still be available in the model.

◆ extraIdentifierValueIndex()

int QgsFeaturePickerModelBase::extraIdentifierValueIndex ( ) const

The index at which the extra identifier value is available within the model.

Definition at line 614 of file qgsfeaturepickermodelbase.cpp.

◆ extraIdentifierValueIndexChanged

void QgsFeaturePickerModelBase::extraIdentifierValueIndexChanged ( int index )

signal

The index at which the extra identifier value is available within the model.

◆ extraValueDoesNotExist()

bool QgsFeaturePickerModelBase::extraValueDoesNotExist ( ) const

Flag indicating that the extraIdentifierValue does not exist in the data.

Definition at line 598 of file qgsfeaturepickermodelbase.cpp.

◆ extraValueDoesNotExistChanged

void QgsFeaturePickerModelBase::extraValueDoesNotExistChanged ( bool found )

signal

Notification whether the model has found a feature tied to the extraIdentifierValue or not.

◆ fetchGeometry()

bool QgsFeaturePickerModelBase::fetchGeometry ( ) const

Returns if the geometry is fetched.

Definition at line 567 of file qgsfeaturepickermodelbase.cpp.

◆ fetchGeometryChanged

void QgsFeaturePickerModelBase::fetchGeometryChanged ( )

signal

Emitted when the fetching of the geometry changes.

◆ fetchLimit()

int QgsFeaturePickerModelBase::fetchLimit ( ) const

Returns the feature request fetch limit.

Definition at line 581 of file qgsfeaturepickermodelbase.cpp.

◆ fetchLimitChanged

void QgsFeaturePickerModelBase::fetchLimitChanged ( )

signal

Emitted when the fetching limit for the feature request changes.

◆ filterExpression()

QString QgsFeaturePickerModelBase::filterExpression ( ) const

An additional filter expression to apply, next to the filterValue.

Can be used for spatial filtering etc.

Definition at line 101 of file qgsfeaturepickermodelbase.cpp.

◆ filterExpressionChanged

void QgsFeaturePickerModelBase::filterExpressionChanged ( )

signal

An additional filter expression to apply, next to the filterValue.

Can be used for spatial filtering etc.

◆ filterJobCompleted

void QgsFeaturePickerModelBase::filterJobCompleted ( )

signal

Indicates that a filter job has been completed and new data may be available.

◆ filterValue()

QString QgsFeaturePickerModelBase::filterValue ( ) const

This value will be used to filter the features available from this model.

Whenever a substring of the displayExpression of a feature matches the filter value, it will be accessible by this model.

Definition at line 84 of file qgsfeaturepickermodelbase.cpp.

◆ filterValueChanged

void QgsFeaturePickerModelBase::filterValueChanged ( )

signal

This value will be used to filter the features available from this model.

Whenever a substring of the displayExpression of a feature matches the filter value, it will be accessible by this model.

◆ identifierIsNull()

virtual bool QgsFeaturePickerModelBase::identifierIsNull ( const QVariant & identifier ) const

protectedpure virtual

Returns true if the entry is null The identifier can be either the feature ID or the list of identifier fields.

◆ index()

QModelIndex QgsFeaturePickerModelBase::index	(	int	row,
		int	column,
		const QModelIndex &	parent
	)		const

override

Definition at line 129 of file qgsfeaturepickermodelbase.cpp.

◆ isLoading()

bool QgsFeaturePickerModelBase::isLoading ( ) const

Indicator if the model is currently performing any feature iteration in the background.

Definition at line 118 of file qgsfeaturepickermodelbase.cpp.

◆ isLoadingChanged

void QgsFeaturePickerModelBase::isLoadingChanged ( )

signal

Indicator if the model is currently performing any feature iteration in the background.

◆ nullIdentifier()

virtual QVariant QgsFeaturePickerModelBase::nullIdentifier ( ) const

protectedpure virtual

Returns a null identifier.

◆ parent()

QModelIndex QgsFeaturePickerModelBase::parent ( const QModelIndex & child ) const

override

Definition at line 136 of file qgsfeaturepickermodelbase.cpp.

◆ requestedAttributes()

virtual QSet< QString > QgsFeaturePickerModelBase::requestedAttributes ( ) const

inlineprotectedvirtual

Returns the attributes to be fetched in the request.

Returns an empty set if all attributes should be fetched.

Definition at line 304 of file qgsfeaturepickermodelbase.h.

◆ requestToReloadCurrentFeature()

virtual void QgsFeaturePickerModelBase::requestToReloadCurrentFeature ( QgsFeatureRequest & request )

protectedpure virtual

Update the request to match the current feature to be reloaded.

◆ rowCount()

int QgsFeaturePickerModelBase::rowCount ( const QModelIndex & parent ) const

override

Definition at line 143 of file qgsfeaturepickermodelbase.cpp.

◆ setAllowNull()

void QgsFeaturePickerModelBase::setAllowNull ( bool allowNull )

Add a NULL entry to the list.

Definition at line 556 of file qgsfeaturepickermodelbase.cpp.

◆ setDisplayExpression()

void QgsFeaturePickerModelBase::setDisplayExpression ( const QString & displayExpression )

The display expression will be used for.

displaying values in the combobox
filtering based on filterValue

Definition at line 73 of file qgsfeaturepickermodelbase.cpp.

◆ setExtraIdentifierValue()

void QgsFeaturePickerModelBase::setExtraIdentifierValue ( const QVariant & extraIdentifierValue )

protected

Allows specifying one value that does not need to match the filter criteria but will still be available in the model.

Definition at line 626 of file qgsfeaturepickermodelbase.cpp.

◆ setExtraIdentifierValueToNull()

virtual void QgsFeaturePickerModelBase::setExtraIdentifierValueToNull ( )

pure virtual

Allows specifying one value that does not need to match the filter criteria but will still be available in the model as NULL value(s).

Implemented in QgsFeatureFilterModel, and QgsFeaturePickerModel.

◆ setExtraIdentifierValueUnguarded()

void QgsFeaturePickerModelBase::setExtraIdentifierValueUnguarded ( const QVariant & identifierValue )

protected

This will set the identifier value to be set in the model even if it doesn't exist currently in the data.

Definition at line 479 of file qgsfeaturepickermodelbase.cpp.

◆ setFetchGeometry()

void QgsFeaturePickerModelBase::setFetchGeometry ( bool fetchGeometry )

Defines if the geometry will be fetched.

Definition at line 572 of file qgsfeaturepickermodelbase.cpp.

◆ setFetchLimit()

void QgsFeaturePickerModelBase::setFetchLimit ( int fetchLimit )

Defines the feature request fetch limit If set to 0, no limit is applied when fetching.

Definition at line 586 of file qgsfeaturepickermodelbase.cpp.

◆ setFilterExpression()

void QgsFeaturePickerModelBase::setFilterExpression ( const QString & filterExpression )

An additional filter expression to apply, next to the filterValue.

Can be used for spatial filtering etc.

Definition at line 107 of file qgsfeaturepickermodelbase.cpp.

◆ setFilterValue()

void QgsFeaturePickerModelBase::setFilterValue ( const QString & filterValue )

This value will be used to filter the features available from this model.

Whenever a substring of the displayExpression of a feature matches the filter value, it will be accessible by this model.

Definition at line 90 of file qgsfeaturepickermodelbase.cpp.

◆ setSourceLayer()

void QgsFeaturePickerModelBase::setSourceLayer ( QgsVectorLayer * sourceLayer )

The source layer from which features will be fetched.

Definition at line 50 of file qgsfeaturepickermodelbase.cpp.

◆ sourceLayer()

QgsVectorLayer * QgsFeaturePickerModelBase::sourceLayer ( ) const

The source layer from which features will be fetched.

Definition at line 44 of file qgsfeaturepickermodelbase.cpp.

◆ sourceLayerChanged

void QgsFeaturePickerModelBase::sourceLayerChanged ( )

signal

The source layer from which features will be fetched.

Friends And Related Symbol Documentation

◆ TestQgsFeatureListComboBox

friend class TestQgsFeatureListComboBox

friend

Definition at line 364 of file qgsfeaturepickermodelbase.h.

Member Data Documentation

◆ mEntries

QVector<QgsFeatureExpressionValuesGatherer::Entry> QgsFeaturePickerModelBase::mEntries

protected

Definition at line 327 of file qgsfeaturepickermodelbase.h.

◆ mExtraIdentifierValue

QVariant QgsFeaturePickerModelBase::mExtraIdentifierValue

protected

The current identifier value.

Definition at line 331 of file qgsfeaturepickermodelbase.h.

◆ mExtraValueIndex

int QgsFeaturePickerModelBase::mExtraValueIndex = -1

protected

The current index.

Definition at line 334 of file qgsfeaturepickermodelbase.h.

Property Documentation

◆ allowNull

bool QgsFeaturePickerModelBase::allowNull

readwrite

Definition at line 40 of file qgsfeaturepickermodelbase.h.

◆ displayExpression

QString QgsFeaturePickerModelBase::displayExpression

readwrite

Definition at line 37 of file qgsfeaturepickermodelbase.h.

◆ extraIdentifierValueIndex

int QgsFeaturePickerModelBase::extraIdentifierValueIndex

read

Definition at line 43 of file qgsfeaturepickermodelbase.h.

◆ fetchGeometry

bool QgsFeaturePickerModelBase::fetchGeometry

readwrite

Definition at line 41 of file qgsfeaturepickermodelbase.h.

◆ fetchLimit

int QgsFeaturePickerModelBase::fetchLimit

readwrite

Definition at line 42 of file qgsfeaturepickermodelbase.h.

◆ filterExpression

QString QgsFeaturePickerModelBase::filterExpression

readwrite

Definition at line 39 of file qgsfeaturepickermodelbase.h.

◆ filterValue

QString QgsFeaturePickerModelBase::filterValue

readwrite

Definition at line 38 of file qgsfeaturepickermodelbase.h.

◆ sourceLayer

QgsVectorLayer * QgsFeaturePickerModelBase::sourceLayer

readwrite

Definition at line 36 of file qgsfeaturepickermodelbase.h.

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

/build/qgis-3.41.0+git20241122+3440c17df1d+99sid/src/core/qgsfeaturepickermodelbase.h
/build/qgis-3.41.0+git20241122+3440c17df1d+99sid/src/core/qgsfeaturepickermodelbase.cpp

Public Types

Signals

Public Member Functions

Protected Member Functions

Protected Attributes

Properties

Friends

Detailed Description

Member Enumeration Documentation

◆ CustomRole

Constructor & Destructor Documentation

◆ QgsFeaturePickerModelBase()

◆ ~QgsFeaturePickerModelBase()

Member Function Documentation

◆ allowNull()

◆ allowNullChanged

◆ beginUpdate

◆ columnCount()

◆ compareEntries()

◆ createEntry()

◆ createValuesGatherer()

◆ currentFeatureChanged

◆ data()

◆ displayExpression()

◆ displayExpressionChanged

◆ endUpdate

◆ entryIdentifier()

◆ extraIdentifierValue()

◆ extraIdentifierValueChanged

◆ extraIdentifierValueIndex()

◆ extraIdentifierValueIndexChanged

◆ extraValueDoesNotExist()

◆ extraValueDoesNotExistChanged

◆ fetchGeometry()

◆ fetchGeometryChanged

◆ fetchLimit()

◆ fetchLimitChanged

◆ filterExpression()

◆ filterExpressionChanged

◆ filterJobCompleted

◆ filterValue()

◆ filterValueChanged

◆ identifierIsNull()

◆ index()

◆ isLoading()

◆ isLoadingChanged

◆ nullIdentifier()

◆ parent()

◆ requestedAttributes()

◆ requestToReloadCurrentFeature()

◆ rowCount()

◆ setAllowNull()

◆ setDisplayExpression()

◆ setExtraIdentifierValue()

◆ setExtraIdentifierValueToNull()

◆ setExtraIdentifierValueUnguarded()

◆ setFetchGeometry()

◆ setFetchLimit()

◆ setFilterExpression()

◆ setFilterValue()

◆ setSourceLayer()

◆ sourceLayer()

◆ sourceLayerChanged

Friends And Related Symbol Documentation

◆ TestQgsFeatureListComboBox

Member Data Documentation

◆ mEntries

◆ mExtraIdentifierValue

◆ mExtraValueIndex

Property Documentation

◆ allowNull

◆ displayExpression

◆ extraIdentifierValueIndex

◆ fetchGeometry

◆ fetchLimit

◆ filterExpression

◆ filterValue

◆ sourceLayer