QgsProcessingParameterDefinition Class Reference

Base class for the definition of processing parameters. More...

#include <qgsprocessingparameters.h>

Inheritance diagram for QgsProcessingParameterDefinition:

Public Types
enum class	ValueAsStringFlag : int { AllowMapLayerValues = 1 << 0 }
	Flags for passing to the valueAsStringPrivate() method. More...
typedef QFlags< ValueAsStringFlag >	ValueAsStringFlags

Public Member Functions
	QgsProcessingParameterDefinition (const QString &name, const QString &description=QString(), const QVariant &defaultValue=QVariant(), bool optional=false, const QString &help=QString())
	Constructor for QgsProcessingParameterDefinition.
virtual	~QgsProcessingParameterDefinition ()=default
QStringList	additionalExpressionContextVariables () const
	Returns a list of additional expression context variables which are available for use when evaluating this parameter.
QgsProcessingAlgorithm *	algorithm () const
	Returns a pointer to the algorithm which owns this parameter.
virtual QString	asPythonString (QgsProcessing::PythonOutputType outputType=QgsProcessing::PythonOutputType::PythonQgsProcessingAlgorithmSubclass) const
	Returns the parameter definition as a Python command which can be used within a Python Processing script.
virtual QString	asScriptCode () const
	Returns the parameter definition encoded in a string which can be used within a Processing script.
virtual bool	checkValueIsAcceptable (const QVariant &input, QgsProcessingContext *context=nullptr) const
	Checks whether the specified input value is acceptable for the parameter.
virtual QgsProcessingParameterDefinition *	clone () const =0
	Creates a clone of the parameter definition.
QVariant	defaultValue () const
	Returns the default value for the parameter.
QVariant	defaultValueForGui () const
	Returns the default value to use for the parameter in a GUI.
virtual QStringList	dependsOnOtherParameters () const
	Returns a list of other parameter names on which this parameter is dependent (e.g.
QString	description () const
	Returns the description for the parameter.
QString	dynamicLayerParameterName () const
	Returns the name of the parameter for a layer linked to a dynamic parameter, or an empty string if this is not set.
QgsPropertyDefinition	dynamicPropertyDefinition () const
	Returns the property definition for dynamic properties.
Qgis::ProcessingParameterFlags	flags () const
	Returns any flags associated with the parameter.
virtual bool	fromVariantMap (const QVariantMap &map)
	Restores this parameter to a QVariantMap.
QVariant	guiDefaultValueOverride () const
	Returns the default value to use in the GUI for the parameter.
QString	help () const
	Returns the help for the parameter.
virtual bool	isDestination () const
	Returns true if this parameter represents a file or layer destination, e.g.
bool	isDynamic () const
	Returns true if the parameter supports is dynamic, and can support data-defined values (i.e.
QVariantMap &	metadata ()
	Returns the parameter's freeform metadata.
QVariantMap	metadata () const
	Returns the parameter's freeform metadata.
QString	name () const
	Returns the name of the parameter.
QgsProcessingProvider *	provider () const
	Returns a pointer to the provider for the algorithm which owns this parameter.
void	setAdditionalExpressionContextVariables (const QStringList &variables)
	Sets a list of additional expression context variables which are available for use when evaluating this parameter.
void	setDefaultValue (const QVariant &value)
	Sets the default value for the parameter.
void	setDescription (const QString &description)
	Sets the description for the parameter.
void	setDynamicLayerParameterName (const QString &name)
	Sets the name for the parameter for a layer linked to a dynamic parameter, or an empty string if this is not set.
void	setDynamicPropertyDefinition (const QgsPropertyDefinition &definition)
	Sets the property definition for dynamic properties.
void	setFlags (Qgis::ProcessingParameterFlags flags)
	Sets the flags associated with the parameter.
void	setGuiDefaultValueOverride (const QVariant &value)
	Sets the default value to use for the parameter in GUI widgets.
void	setHelp (const QString &help)
	Sets the help for the parameter.
void	setIsDynamic (bool dynamic)
	Sets whether the parameter is dynamic, and can support data-defined values (i.e.
void	setMetadata (const QVariantMap &metadata)
	Sets the parameter's freeform metadata.
void	setName (const QString &name)
	Sets the name of the parameter.
virtual QString	toolTip () const
	Returns a formatted tooltip for use with the parameter, which gives helpful information like parameter description, ID, and extra content like default values (depending on parameter type).
virtual QVariantMap	toVariantMap () const
	Saves this parameter to a QVariantMap.
virtual QString	type () const =0
	Unique parameter type name.
virtual QVariant	valueAsJsonObject (const QVariant &value, QgsProcessingContext &context) const
	Returns a version of the parameter input value, which is suitable for use in a JSON object.
virtual QString	valueAsPythonComment (const QVariant &value, QgsProcessingContext &context) const
	Returns a Python comment explaining a parameter value, or an empty string if no comment is required.
virtual QString	valueAsPythonString (const QVariant &value, QgsProcessingContext &context) const
	Returns a string version of the parameter input value, which is suitable for use as an input parameter value when running an algorithm directly from a Python command.
virtual QString	valueAsString (const QVariant &value, QgsProcessingContext &context, bool &ok) const
	Returns a string version of the parameter input value (if possible).
virtual QStringList	valueAsStringList (const QVariant &value, QgsProcessingContext &context, bool &ok) const
	Returns a string list version of the parameter input value (if possible).

Protected Member Functions
QVariant	defaultGuiValueFromSetting () const
	Default gui value for an algorithm parameter from settings.
QVariant	valueAsJsonObjectPrivate (const QVariant &value, QgsProcessingContext &context, ValueAsStringFlags flags) const
	Internal method for evaluating values as JSON objects.
QString	valueAsStringPrivate (const QVariant &value, QgsProcessingContext &context, bool &ok, ValueAsStringFlags flags) const
	Internal method for evaluating values as string.

Protected Attributes
QStringList	mAdditionalExpressionVariables
	Additional expression context variables exposed for use by this parameter.
QgsProcessingAlgorithm *	mAlgorithm = nullptr
	Pointer to algorithm which owns this parameter.
QVariant	mDefault
	Default value for parameter.
QString	mDescription
	Parameter description.
QString	mDynamicLayerParameterName
	Linked vector layer parameter name for dynamic properties.
Qgis::ProcessingParameterFlags	mFlags
	Parameter flags.
QVariant	mGuiDefault
	Default value for parameter in GUI.
QString	mHelp
	Parameter help.
bool	mIsDynamic = false
	True for dynamic parameters, which can have data-defined (QgsProperty) based values.
QVariantMap	mMetadata
	Freeform metadata for parameter. Mostly used by widget wrappers to customize their appearance and behavior.
QString	mName
	Parameter name.
QgsPropertyDefinition	mPropertyDefinition
	Data defined property definition.

Friends
class	QgsProcessingAlgorithm

Detailed Description

Base class for the definition of processing parameters.

Parameter definitions encapsulate properties regarding the behavior of parameters, their acceptable ranges, defaults, etc.

Definition at line 333 of file qgsprocessingparameters.h.

Member Typedef Documentation

ValueAsStringFlags

typedef QFlags< ValueAsStringFlag > QgsProcessingParameterDefinition::ValueAsStringFlags

Definition at line 853 of file qgsprocessingparameters.h.

Member Enumeration Documentation

ValueAsStringFlag

enum class QgsProcessingParameterDefinition::ValueAsStringFlag : int

strong

Flags for passing to the valueAsStringPrivate() method.

Note

Not available in Python bindings

Since

QGIS 3.28

Enumerator
AllowMapLayerValues	Enable map layer value handling.

Definition at line 849 of file qgsprocessingparameters.h.

Constructor & Destructor Documentation

QgsProcessingParameterDefinition()

QgsProcessingParameterDefinition::QgsProcessingParameterDefinition	(	const QString &	name,
		const QString &	description = QString(),
		const QVariant &	defaultValue = QVariant(),
		bool	optional = false,
		const QString &	help = QString()
	)

Constructor for QgsProcessingParameterDefinition.

Definition at line 2453 of file qgsprocessingparameters.cpp.

~QgsProcessingParameterDefinition()

virtual QgsProcessingParameterDefinition::~QgsProcessingParameterDefinition ( )

virtualdefault

Member Function Documentation

additionalExpressionContextVariables()

QStringList QgsProcessingParameterDefinition::additionalExpressionContextVariables ( ) const

inline

Returns a list of additional expression context variables which are available for use when evaluating this parameter.

The additional variables will be added to the variables exposed from the usual expression context available to the parameter. They can be used to expose variables which are ONLY available to this parameter.

The returned list should contain the variable names only, without the usual "@" prefix.

See also

setAdditionalExpressionContextVariables()

Since

QGIS 3.8

Definition at line 819 of file qgsprocessingparameters.h.

algorithm()

QgsProcessingAlgorithm * QgsProcessingParameterDefinition::algorithm

(

)

const

Returns a pointer to the algorithm which owns this parameter.

May be nullptr for non-owned parameters.

See also

provider()

Definition at line 2990 of file qgsprocessingparameters.cpp.

asPythonString()

QString QgsProcessingParameterDefinition::asPythonString ( QgsProcessing::PythonOutputType  outputType = QgsProcessing::PythonOutputType::PythonQgsProcessingAlgorithmSubclass ) const

virtual

Returns the parameter definition as a Python command which can be used within a Python Processing script.

The outputType argument specifies the desired output format for the Python string, i.e. the intended end use of the generated Python code.

Since

QGIS 3.6

Reimplemented in QgsProcessingParameterAggregate, QgsProcessingParameterAlignRasterLayers, QgsProcessingParameterDxfLayers, QgsProcessingParameterFieldMapping, QgsProcessingParameterMeshDatasetGroups, QgsProcessingParameterMeshDatasetTime, QgsProcessingParameterGeometry, QgsProcessingParameterFile, QgsProcessingParameterMatrix, QgsProcessingParameterMultipleLayers, QgsProcessingParameterNumber, QgsProcessingParameterDistance, QgsProcessingParameterArea, QgsProcessingParameterVolume, QgsProcessingParameterDuration, QgsProcessingParameterScale, QgsProcessingParameterRange, QgsProcessingParameterEnum, QgsProcessingParameterString, QgsProcessingParameterExpression, QgsProcessingParameterVectorLayer, QgsProcessingParameterMapLayer, QgsProcessingParameterField, QgsProcessingParameterFeatureSource, QgsProcessingDestinationParameter, QgsProcessingParameterFeatureSink, QgsProcessingParameterVectorDestination, QgsProcessingParameterFileDestination, QgsProcessingParameterBand, QgsProcessingParameterLayout, QgsProcessingParameterLayoutItem, QgsProcessingParameterColor, QgsProcessingParameterCoordinateOperation, QgsProcessingParameterMapTheme, QgsProcessingParameterDateTime, QgsProcessingParameterProviderConnection, QgsProcessingParameterDatabaseSchema, QgsProcessingParameterDatabaseTable, QgsProcessingParameterPointCloudAttribute, QgsProcessingParameterTinInputLayers, and QgsProcessingParameterVectorTileWriterLayers.

Definition at line 2939 of file qgsprocessingparameters.cpp.

asScriptCode()

QString QgsProcessingParameterDefinition::asScriptCode ( ) const

virtual

Returns the parameter definition encoded in a string which can be used within a Processing script.

Reimplemented in QgsProcessingParameterBoolean, QgsProcessingParameterGeometry, QgsProcessingParameterFile, QgsProcessingParameterMultipleLayers, QgsProcessingParameterEnum, QgsProcessingParameterString, QgsProcessingParameterAuthConfig, QgsProcessingParameterMapLayer, QgsProcessingParameterField, QgsProcessingParameterFeatureSource, QgsProcessingParameterFeatureSink, QgsProcessingParameterVectorDestination, QgsProcessingParameterBand, QgsProcessingParameterLayout, QgsProcessingParameterLayoutItem, QgsProcessingParameterColor, QgsProcessingParameterCoordinateOperation, QgsProcessingParameterMapTheme, QgsProcessingParameterProviderConnection, QgsProcessingParameterDatabaseSchema, QgsProcessingParameterDatabaseTable, and QgsProcessingParameterPointCloudAttribute.

Definition at line 2929 of file qgsprocessingparameters.cpp.

checkValueIsAcceptable()

bool QgsProcessingParameterDefinition::checkValueIsAcceptable ( const QVariant &  input, QgsProcessingContext *  context = nullptr  ) const

virtual

Checks whether the specified input value is acceptable for the parameter.

Returns true if the value can be accepted. The optional context parameter can be specified to allow a more stringent check to be performed, capable of checking for the presence of required layers and other factors within the context.

Reimplemented in QgsProcessingParameterAggregate, QgsProcessingParameterAlignRasterLayers, QgsProcessingParameterDxfLayers, QgsProcessingParameterFieldMapping, QgsProcessingParameterMeshDatasetGroups, QgsProcessingParameterMeshDatasetTime, QgsProcessingParameterCrs, QgsProcessingParameterExtent, QgsProcessingParameterPoint, QgsProcessingParameterGeometry, QgsProcessingParameterFile, QgsProcessingParameterMatrix, QgsProcessingParameterMultipleLayers, QgsProcessingParameterNumber, QgsProcessingParameterRange, QgsProcessingParameterRasterLayer, QgsProcessingParameterEnum, QgsProcessingParameterVectorLayer, QgsProcessingParameterMeshLayer, QgsProcessingParameterMapLayer, QgsProcessingParameterField, QgsProcessingParameterFeatureSource, QgsProcessingParameterFeatureSink, QgsProcessingParameterVectorDestination, QgsProcessingParameterRasterDestination, QgsProcessingParameterFileDestination, QgsProcessingParameterFolderDestination, QgsProcessingParameterBand, QgsProcessingParameterColor, QgsProcessingParameterMapTheme, QgsProcessingParameterDateTime, QgsProcessingParameterProviderConnection, QgsProcessingParameterDatabaseSchema, QgsProcessingParameterDatabaseTable, QgsProcessingParameterPointCloudLayer, QgsProcessingParameterAnnotationLayer, QgsProcessingParameterPointCloudDestination, QgsProcessingParameterPointCloudAttribute, QgsProcessingParameterVectorTileDestination, QgsProcessingParameterTinInputLayers, and QgsProcessingParameterVectorTileWriterLayers.

Definition at line 2495 of file qgsprocessingparameters.cpp.

clone()

virtual QgsProcessingParameterDefinition * QgsProcessingParameterDefinition::clone ( ) const

pure virtual

Creates a clone of the parameter definition.

Implemented in QgsProcessingParameterAggregate, QgsProcessingParameterAlignRasterLayers, QgsProcessingParameterDxfLayers, QgsProcessingParameterFieldMapping, QgsProcessingParameterMeshDatasetGroups, QgsProcessingParameterMeshDatasetTime, QgsProcessingParameterBoolean, QgsProcessingParameterCrs, QgsProcessingParameterExtent, QgsProcessingParameterPoint, QgsProcessingParameterGeometry, QgsProcessingParameterFile, QgsProcessingParameterMatrix, QgsProcessingParameterMultipleLayers, QgsProcessingParameterNumber, QgsProcessingParameterDistance, QgsProcessingParameterArea, QgsProcessingParameterVolume, QgsProcessingParameterDuration, QgsProcessingParameterScale, QgsProcessingParameterRange, QgsProcessingParameterRasterLayer, QgsProcessingParameterEnum, QgsProcessingParameterString, QgsProcessingParameterAuthConfig, QgsProcessingParameterExpression, QgsProcessingParameterVectorLayer, QgsProcessingParameterMeshLayer, QgsProcessingParameterMapLayer, QgsProcessingParameterField, QgsProcessingParameterFeatureSource, QgsProcessingParameterFeatureSink, QgsProcessingParameterVectorDestination, QgsProcessingParameterRasterDestination, QgsProcessingParameterFileDestination, QgsProcessingParameterFolderDestination, QgsProcessingParameterBand, QgsProcessingParameterLayout, QgsProcessingParameterLayoutItem, QgsProcessingParameterColor, QgsProcessingParameterCoordinateOperation, QgsProcessingParameterMapTheme, QgsProcessingParameterDateTime, QgsProcessingParameterProviderConnection, QgsProcessingParameterDatabaseSchema, QgsProcessingParameterDatabaseTable, QgsProcessingParameterPointCloudLayer, QgsProcessingParameterAnnotationLayer, QgsProcessingParameterPointCloudDestination, QgsProcessingParameterPointCloudAttribute, QgsProcessingParameterVectorTileDestination, QgsProcessingParameterTinInputLayers, and QgsProcessingParameterVectorTileWriterLayers.

defaultGuiValueFromSetting()

QVariant QgsProcessingParameterDefinition::defaultGuiValueFromSetting ( ) const

protected

Default gui value for an algorithm parameter from settings.

Returns

default value from settings or invalid QVariant if there is no default value defined in the settings

Since

QGIS 3.34

Definition at line 2481 of file qgsprocessingparameters.cpp.

defaultValue()

QVariant QgsProcessingParameterDefinition::defaultValue ( ) const

inline

Returns the default value for the parameter.

See also

setDefaultValue()

defaultValueForGui()

guiDefaultValueOverride()

Definition at line 536 of file qgsprocessingparameters.h.

defaultValueForGui()

QVariant QgsProcessingParameterDefinition::defaultValueForGui

(

)

const

Returns the default value to use for the parameter in a GUI.

This will be the parameter's defaultValue(), unless a guiDefaultValueOverride() is set to override that.

Since

QGIS 3.18

Definition at line 2471 of file qgsprocessingparameters.cpp.

dependsOnOtherParameters()

virtual QStringList QgsProcessingParameterDefinition::dependsOnOtherParameters ( ) const

inlinevirtual

Returns a list of other parameter names on which this parameter is dependent (e.g.

field parameters which depend on a parent layer parameter).

Reimplemented in QgsProcessingParameterAggregate, QgsProcessingParameterFieldMapping, QgsProcessingParameterMeshDatasetGroups, QgsProcessingParameterMeshDatasetTime, QgsProcessingParameterDistance, QgsProcessingParameterArea, QgsProcessingParameterVolume, QgsProcessingParameterExpression, QgsProcessingParameterField, QgsProcessingParameterBand, QgsProcessingParameterLayoutItem, QgsProcessingParameterCoordinateOperation, QgsProcessingParameterDatabaseSchema, QgsProcessingParameterDatabaseTable, and QgsProcessingParameterPointCloudAttribute.

Definition at line 724 of file qgsprocessingparameters.h.

description()

QString QgsProcessingParameterDefinition::description ( ) const

inline

Returns the description for the parameter.

This is the user-visible string used to identify this parameter.

See also

setDescription()

Definition at line 499 of file qgsprocessingparameters.h.

dynamicLayerParameterName()

QString QgsProcessingParameterDefinition::dynamicLayerParameterName ( ) const

inline

Returns the name of the parameter for a layer linked to a dynamic parameter, or an empty string if this is not set.

Dynamic parameters (see isDynamic()) can have an optional vector layer parameter linked to them, which indicates which layer the fields and values will be available from when evaluating the dynamic parameter.

See also

setDynamicLayerParameterName()

isDynamic()

dynamicPropertyDefinition()

Definition at line 791 of file qgsprocessingparameters.h.

dynamicPropertyDefinition()

QgsPropertyDefinition QgsProcessingParameterDefinition::dynamicPropertyDefinition ( ) const

inline

Returns the property definition for dynamic properties.

See also

isDynamic()

setDynamicPropertyDefinition()

dynamicLayerParameterName()

Definition at line 770 of file qgsprocessingparameters.h.

flags()

Qgis::ProcessingParameterFlags QgsProcessingParameterDefinition::flags ( ) const

inline

Returns any flags associated with the parameter.

See also

setFlags()

Definition at line 591 of file qgsprocessingparameters.h.

fromVariantMap()

bool QgsProcessingParameterDefinition::fromVariantMap ( const QVariantMap &  map )

virtual

Restores this parameter to a QVariantMap.

Subclasses should ensure that they call the base class method.

See also

toVariantMap()

Reimplemented in QgsProcessingParameterAggregate, QgsProcessingParameterFieldMapping, QgsProcessingParameterMeshDatasetGroups, QgsProcessingParameterMeshDatasetTime, QgsProcessingParameterGeometry, QgsProcessingParameterFile, QgsProcessingParameterMatrix, QgsProcessingParameterMultipleLayers, QgsProcessingParameterNumber, QgsProcessingParameterDistance, QgsProcessingParameterArea, QgsProcessingParameterVolume, QgsProcessingParameterDuration, QgsProcessingParameterRange, QgsProcessingParameterEnum, QgsProcessingParameterString, QgsProcessingParameterExpression, QgsProcessingParameterVectorLayer, QgsProcessingParameterMapLayer, QgsProcessingParameterField, QgsProcessingParameterFeatureSource, QgsProcessingDestinationParameter, QgsProcessingParameterFeatureSink, QgsProcessingParameterVectorDestination, QgsProcessingParameterFileDestination, QgsProcessingParameterBand, QgsProcessingParameterLayoutItem, QgsProcessingParameterColor, QgsProcessingParameterCoordinateOperation, QgsProcessingParameterMapTheme, QgsProcessingParameterDateTime, QgsProcessingParameterProviderConnection, QgsProcessingParameterDatabaseSchema, QgsProcessingParameterDatabaseTable, and QgsProcessingParameterPointCloudAttribute.

Definition at line 2978 of file qgsprocessingparameters.cpp.

guiDefaultValueOverride()

QVariant QgsProcessingParameterDefinition::guiDefaultValueOverride

(

)

const

Returns the default value to use in the GUI for the parameter.

Usually this will return an invalid variant, which indicates that the standard defaultValue() will be used in the GUI.

See also

defaultValue()

setGuiDefaultValueOverride()

defaultValueForGui()

Since

QGIS 3.18

Definition at line 2461 of file qgsprocessingparameters.cpp.

help()

QString QgsProcessingParameterDefinition::help ( ) const

inline

Returns the help for the parameter.

This is a descriptive (possibly lengthy), translated string explaining the parameter's behavior and use in depth.

See also

setHelp()

Since

QGIS 3.16

Definition at line 517 of file qgsprocessingparameters.h.

isDestination()

virtual bool QgsProcessingParameterDefinition::isDestination ( ) const

inlinevirtual

Returns true if this parameter represents a file or layer destination, e.g.

parameters which are used for the destination for layers output by an algorithm will return true.

Reimplemented in QgsProcessingDestinationParameter.

Definition at line 478 of file qgsprocessingparameters.h.

isDynamic()

bool QgsProcessingParameterDefinition::isDynamic ( ) const

inline

Returns true if the parameter supports is dynamic, and can support data-defined values (i.e.

QgsProperty based values).

See also

setIsDynamic()

dynamicPropertyDefinition()

dynamicLayerParameterName()

Definition at line 753 of file qgsprocessingparameters.h.

metadata() [1/2]

QVariantMap & QgsProcessingParameterDefinition::metadata ( )

inline

Returns the parameter's freeform metadata.

This is mostly used by parameter widget wrappers in order to customize their appearance and behavior.

See also

setMetadata()

Definition at line 711 of file qgsprocessingparameters.h.

metadata() [2/2]

QVariantMap QgsProcessingParameterDefinition::metadata ( ) const

inline

Returns the parameter's freeform metadata.

This is mostly used by parameter widget wrappers in order to customize their appearance and behavior.

See also

setMetadata()

Note

not available in Python bindings.

Definition at line 704 of file qgsprocessingparameters.h.

name()

QString QgsProcessingParameterDefinition::name ( ) const

inline

Returns the name of the parameter.

This is the internal identifier by which algorithms access this parameter.

See also

setName()

Definition at line 485 of file qgsprocessingparameters.h.

provider()

QgsProcessingProvider * QgsProcessingParameterDefinition::provider

(

)

const

Returns a pointer to the provider for the algorithm which owns this parameter.

May be nullptr for non-owned parameters or algorithms.

See also

algorithm()

Definition at line 2995 of file qgsprocessingparameters.cpp.

setAdditionalExpressionContextVariables()

void QgsProcessingParameterDefinition::setAdditionalExpressionContextVariables ( const QStringList &  variables )

inline

Sets a list of additional expression context variables which are available for use when evaluating this parameter.

The additional variables will be added to the variables exposed from the usual expression context available to the parameter. They can be used to expose variables which are ONLY available to this parameter.

The variables list should contain the variable names only, without the usual "@" prefix.

Note

Specifying variables via this method is for metadata purposes only. It is the algorithm's responsibility to correctly set the value of these additional variables in all expression context used when evaluating the parameter, in whichever way is appropriate for that particular variable.

See also

additionalExpressionContextVariables()

Since

QGIS 3.8

Definition at line 838 of file qgsprocessingparameters.h.

setDefaultValue()

void QgsProcessingParameterDefinition::setDefaultValue ( const QVariant &  value )

inline

Sets the default value for the parameter.

Caller takes responsibility to ensure that value is a valid input for the parameter subclass.

See also

defaultValue()

setGuiDefaultValueOverride()

Definition at line 544 of file qgsprocessingparameters.h.

setDescription()

void QgsProcessingParameterDefinition::setDescription ( const QString &  description )

inline

Sets the description for the parameter.

This is the user-visible string used to identify this parameter.

See also

description()

Definition at line 506 of file qgsprocessingparameters.h.

setDynamicLayerParameterName()

void QgsProcessingParameterDefinition::setDynamicLayerParameterName ( const QString &  name )

inline

Sets the name for the parameter for a layer linked to a dynamic parameter, or an empty string if this is not set.

Dynamic parameters (see isDynamic()) can have an optional vector layer parameter linked to them, which indicates which layer the fields and values will be available from when evaluating the dynamic parameter.

See also

dynamicLayerParameterName()

isDynamic()

setDynamicPropertyDefinition()

Definition at line 804 of file qgsprocessingparameters.h.

setDynamicPropertyDefinition()

void QgsProcessingParameterDefinition::setDynamicPropertyDefinition ( const QgsPropertyDefinition &  definition )

inline

Sets the property definition for dynamic properties.

See also

isDynamic()

dynamicPropertyDefinition()

setDynamicLayerParameterName()

Definition at line 778 of file qgsprocessingparameters.h.

setFlags()

void QgsProcessingParameterDefinition::setFlags ( Qgis::ProcessingParameterFlags  flags )

inline

Sets the flags associated with the parameter.

See also

flags()

Definition at line 597 of file qgsprocessingparameters.h.

setGuiDefaultValueOverride()

void QgsProcessingParameterDefinition::setGuiDefaultValueOverride ( const QVariant &  value )

inline

Sets the default value to use for the parameter in GUI widgets.

Caller takes responsibility to ensure that value is a valid input for the parameter subclass.

Usually the guiDefaultValueOverride() is a invalid variant, which indicates that the standard defaultValue() should be used in the GUI. In cases where it is decided that a previous default value was inappropriate, setting a non-invalid default GUI value can be used to change the default value for the parameter shown to users when running algorithms without changing the actual defaultValue() and potentially breaking third party scripts.

See also

guiDefaultValueOverride()

setDefaultValue()

Since

QGIS 3.18

Definition at line 575 of file qgsprocessingparameters.h.

setHelp()

void QgsProcessingParameterDefinition::setHelp ( const QString &  help )

inline

Sets the help for the parameter.

The help string should be a descriptive, translated string explaining the parameter's behavior and use in depth.

See also

help()

Since

QGIS 3.16

Definition at line 528 of file qgsprocessingparameters.h.

setIsDynamic()

void QgsProcessingParameterDefinition::setIsDynamic ( bool  dynamic )

inline

Sets whether the parameter is dynamic, and can support data-defined values (i.e.

QgsProperty based values).

See also

isDynamic()

setDynamicPropertyDefinition()

setDynamicLayerParameterName()

Definition at line 762 of file qgsprocessingparameters.h.

setMetadata()

void QgsProcessingParameterDefinition::setMetadata ( const QVariantMap &  metadata )

inline

Sets the parameter's freeform metadata.

This is mostly used by parameter widget wrappers in order to customize their appearance and behavior.

See also

metadata()

Definition at line 718 of file qgsprocessingparameters.h.

setName()

void QgsProcessingParameterDefinition::setName ( const QString &  name )

inline

Sets the name of the parameter.

This is the internal identifier by which algorithms access this parameter.

See also

name()

Definition at line 492 of file qgsprocessingparameters.h.

toolTip()

QString QgsProcessingParameterDefinition::toolTip ( ) const

virtual

Returns a formatted tooltip for use with the parameter, which gives helpful information like parameter description, ID, and extra content like default values (depending on parameter type).

Reimplemented in QgsProcessingParameterNumber, and QgsProcessingParameterDateTime.

Definition at line 3000 of file qgsprocessingparameters.cpp.

toVariantMap()

QVariantMap QgsProcessingParameterDefinition::toVariantMap ( ) const

virtual

Saves this parameter to a QVariantMap.

Subclasses should ensure that they call the base class method and then extend the result with additional properties.

See also

fromVariantMap()

Reimplemented in QgsProcessingParameterAggregate, QgsProcessingParameterFieldMapping, QgsProcessingParameterMeshDatasetGroups, QgsProcessingParameterMeshDatasetTime, QgsProcessingParameterGeometry, QgsProcessingParameterFile, QgsProcessingParameterMatrix, QgsProcessingParameterMultipleLayers, QgsProcessingParameterNumber, QgsProcessingParameterDistance, QgsProcessingParameterArea, QgsProcessingParameterVolume, QgsProcessingParameterDuration, QgsProcessingParameterRange, QgsProcessingParameterEnum, QgsProcessingParameterString, QgsProcessingParameterExpression, QgsProcessingParameterVectorLayer, QgsProcessingParameterMapLayer, QgsProcessingParameterField, QgsProcessingParameterFeatureSource, QgsProcessingDestinationParameter, QgsProcessingParameterFeatureSink, QgsProcessingParameterVectorDestination, QgsProcessingParameterFileDestination, QgsProcessingParameterBand, QgsProcessingParameterLayoutItem, QgsProcessingParameterColor, QgsProcessingParameterCoordinateOperation, QgsProcessingParameterMapTheme, QgsProcessingParameterDateTime, QgsProcessingParameterProviderConnection, QgsProcessingParameterDatabaseSchema, QgsProcessingParameterDatabaseTable, and QgsProcessingParameterPointCloudAttribute.

Definition at line 2964 of file qgsprocessingparameters.cpp.

type()

virtual QString QgsProcessingParameterDefinition::type ( ) const

pure virtual

Unique parameter type name.

Implemented in QgsProcessingParameterAggregate, QgsProcessingParameterAlignRasterLayers, QgsProcessingParameterDxfLayers, QgsProcessingParameterFieldMapping, QgsProcessingParameterMeshDatasetGroups, QgsProcessingParameterMeshDatasetTime, QgsProcessingParameterBoolean, QgsProcessingParameterCrs, QgsProcessingParameterExtent, QgsProcessingParameterPoint, QgsProcessingParameterGeometry, QgsProcessingParameterFile, QgsProcessingParameterMatrix, QgsProcessingParameterMultipleLayers, QgsProcessingParameterNumber, QgsProcessingParameterDistance, QgsProcessingParameterArea, QgsProcessingParameterVolume, QgsProcessingParameterDuration, QgsProcessingParameterScale, QgsProcessingParameterRange, QgsProcessingParameterRasterLayer, QgsProcessingParameterEnum, QgsProcessingParameterString, QgsProcessingParameterAuthConfig, QgsProcessingParameterExpression, QgsProcessingParameterVectorLayer, QgsProcessingParameterMeshLayer, QgsProcessingParameterMapLayer, QgsProcessingParameterField, QgsProcessingParameterFeatureSource, QgsProcessingParameterFeatureSink, QgsProcessingParameterVectorDestination, QgsProcessingParameterRasterDestination, QgsProcessingParameterFileDestination, QgsProcessingParameterFolderDestination, QgsProcessingParameterBand, QgsProcessingParameterLayout, QgsProcessingParameterLayoutItem, QgsProcessingParameterColor, QgsProcessingParameterCoordinateOperation, QgsProcessingParameterMapTheme, QgsProcessingParameterDateTime, QgsProcessingParameterProviderConnection, QgsProcessingParameterDatabaseSchema, QgsProcessingParameterDatabaseTable, QgsProcessingParameterPointCloudLayer, QgsProcessingParameterAnnotationLayer, QgsProcessingParameterPointCloudDestination, QgsProcessingParameterPointCloudAttribute, QgsProcessingParameterVectorTileDestination, QgsProcessingParameterTinInputLayers, and QgsProcessingParameterVectorTileWriterLayers.

valueAsJsonObject()

QVariant QgsProcessingParameterDefinition::valueAsJsonObject ( const QVariant &  value, QgsProcessingContext &  context  ) const

virtual

Returns a version of the parameter input value, which is suitable for use in a JSON object.

This method must return only simple values which can be losslessly encapsulated in a serialized JSON map. For instance, any QGIS class values (such as QgsCoordinateReferenceSystem) must be converted to a simple string or numeric value equivalent.

See also

valueAsPythonString()

valueAsString()

Since

QGIS 3.24

Reimplemented in QgsProcessingParameterAlignRasterLayers, QgsProcessingParameterDxfLayers, QgsProcessingParameterCrs, QgsProcessingParameterExtent, QgsProcessingParameterMultipleLayers, QgsProcessingParameterRasterLayer, QgsProcessingParameterVectorLayer, QgsProcessingParameterMeshLayer, QgsProcessingParameterMapLayer, QgsProcessingParameterFeatureSource, QgsProcessingParameterPointCloudLayer, QgsProcessingParameterAnnotationLayer, and QgsProcessingParameterTinInputLayers.

Definition at line 2518 of file qgsprocessingparameters.cpp.

valueAsJsonObjectPrivate()

QVariant QgsProcessingParameterDefinition::valueAsJsonObjectPrivate ( const QVariant &  value, QgsProcessingContext &  context, ValueAsStringFlags  flags  ) const

protected

Internal method for evaluating values as JSON objects.

Note

Not available in Python bindings

Since

QGIS 3.28

Definition at line 2523 of file qgsprocessingparameters.cpp.

valueAsPythonComment()

QString QgsProcessingParameterDefinition::valueAsPythonComment ( const QVariant &  value, QgsProcessingContext &  context  ) const

virtual

Returns a Python comment explaining a parameter value, or an empty string if no comment is required.

Since

QGIS 3.20

Reimplemented in QgsProcessingParameterEnum.

Definition at line 2924 of file qgsprocessingparameters.cpp.

valueAsPythonString()

QString QgsProcessingParameterDefinition::valueAsPythonString ( const QVariant &  value, QgsProcessingContext &  context  ) const

virtual

Returns a string version of the parameter input value, which is suitable for use as an input parameter value when running an algorithm directly from a Python command.

See also

valueAsJsonObject()

valueAsString()

Reimplemented in QgsProcessingParameterAggregate, QgsProcessingParameterAlignRasterLayers, QgsProcessingParameterDxfLayers, QgsProcessingParameterFieldMapping, QgsProcessingParameterMeshDatasetGroups, QgsProcessingParameterMeshDatasetTime, QgsProcessingParameterBoolean, QgsProcessingParameterCrs, QgsProcessingParameterExtent, QgsProcessingParameterPoint, QgsProcessingParameterGeometry, QgsProcessingParameterMatrix, QgsProcessingParameterMultipleLayers, QgsProcessingParameterNumber, QgsProcessingParameterRange, QgsProcessingParameterRasterLayer, QgsProcessingParameterEnum, QgsProcessingParameterString, QgsProcessingParameterAuthConfig, QgsProcessingParameterExpression, QgsProcessingParameterVectorLayer, QgsProcessingParameterMeshLayer, QgsProcessingParameterMapLayer, QgsProcessingParameterField, QgsProcessingParameterFeatureSource, QgsProcessingParameterFeatureSink, QgsProcessingParameterVectorDestination, QgsProcessingParameterRasterDestination, QgsProcessingParameterFileDestination, QgsProcessingParameterBand, QgsProcessingParameterLayout, QgsProcessingParameterLayoutItem, QgsProcessingParameterColor, QgsProcessingParameterCoordinateOperation, QgsProcessingParameterMapTheme, QgsProcessingParameterDateTime, QgsProcessingParameterProviderConnection, QgsProcessingParameterDatabaseSchema, QgsProcessingParameterDatabaseTable, QgsProcessingParameterPointCloudLayer, QgsProcessingParameterAnnotationLayer, QgsProcessingParameterPointCloudDestination, QgsProcessingParameterPointCloudAttribute, QgsProcessingParameterVectorTileDestination, QgsProcessingParameterTinInputLayers, and QgsProcessingParameterVectorTileWriterLayers.

Definition at line 2507 of file qgsprocessingparameters.cpp.

valueAsString()

QString QgsProcessingParameterDefinition::valueAsString ( const QVariant &  value, QgsProcessingContext &  context, bool &  ok  ) const

virtual

Returns a string version of the parameter input value (if possible).

Parameters

value	value to convert
context	processing context
ok	will be set to true if value could be represented as a string.

Returns

value converted to string

See also

valueAsStringList()

valueAsJsonObject()

valueAsPythonString()

Since

QGIS 3.24

Reimplemented in QgsProcessingParameterAlignRasterLayers, QgsProcessingParameterDxfLayers, QgsProcessingParameterCrs, QgsProcessingParameterExtent, QgsProcessingParameterMultipleLayers, QgsProcessingParameterRasterLayer, QgsProcessingParameterVectorLayer, QgsProcessingParameterMeshLayer, QgsProcessingParameterMapLayer, QgsProcessingParameterFeatureSource, QgsProcessingParameterPointCloudLayer, QgsProcessingParameterAnnotationLayer, and QgsProcessingParameterTinInputLayers.

Definition at line 2721 of file qgsprocessingparameters.cpp.

valueAsStringList()

QStringList QgsProcessingParameterDefinition::valueAsStringList ( const QVariant &  value, QgsProcessingContext &  context, bool &  ok  ) const

virtual

Returns a string list version of the parameter input value (if possible).

Parameters

value	value to convert
context	processing context
ok	will be set to true if value could be represented as a string list

Returns

value converted to string list

See also

valueAsString()

valueAsJsonObject()

valueAsPythonString()

Since

QGIS 3.24

Definition at line 2899 of file qgsprocessingparameters.cpp.

valueAsStringPrivate()

QString QgsProcessingParameterDefinition::valueAsStringPrivate ( const QVariant &  value, QgsProcessingContext &  context, bool &  ok, ValueAsStringFlags  flags  ) const

protected

Internal method for evaluating values as string.

Note

Not available in Python bindings

Since

QGIS 3.28

Definition at line 2726 of file qgsprocessingparameters.cpp.

Friends And Related Symbol Documentation

QgsProcessingAlgorithm

friend class QgsProcessingAlgorithm

friend

Definition at line 922 of file qgsprocessingparameters.h.

Member Data Documentation

mAdditionalExpressionVariables

QStringList QgsProcessingParameterDefinition::mAdditionalExpressionVariables

protected

Additional expression context variables exposed for use by this parameter.

Definition at line 919 of file qgsprocessingparameters.h.

mAlgorithm

QgsProcessingAlgorithm* QgsProcessingParameterDefinition::mAlgorithm = nullptr

protected

Pointer to algorithm which owns this parameter.

Definition at line 907 of file qgsprocessingparameters.h.

mDefault

QVariant QgsProcessingParameterDefinition::mDefault

protected

Default value for parameter.

Definition at line 895 of file qgsprocessingparameters.h.

mDescription

QString QgsProcessingParameterDefinition::mDescription

protected

Parameter description.

Definition at line 889 of file qgsprocessingparameters.h.

mDynamicLayerParameterName

QString QgsProcessingParameterDefinition::mDynamicLayerParameterName

protected

Linked vector layer parameter name for dynamic properties.

Definition at line 916 of file qgsprocessingparameters.h.

mFlags

Qgis::ProcessingParameterFlags QgsProcessingParameterDefinition::mFlags

protected

Parameter flags.

Definition at line 901 of file qgsprocessingparameters.h.

mGuiDefault

QVariant QgsProcessingParameterDefinition::mGuiDefault

protected

Default value for parameter in GUI.

Definition at line 898 of file qgsprocessingparameters.h.

mHelp

QString QgsProcessingParameterDefinition::mHelp

protected

Parameter help.

Definition at line 892 of file qgsprocessingparameters.h.

mIsDynamic

bool QgsProcessingParameterDefinition::mIsDynamic = false

protected

True for dynamic parameters, which can have data-defined (QgsProperty) based values.

Definition at line 910 of file qgsprocessingparameters.h.

mMetadata

QVariantMap QgsProcessingParameterDefinition::mMetadata

protected

Freeform metadata for parameter. Mostly used by widget wrappers to customize their appearance and behavior.

Definition at line 904 of file qgsprocessingparameters.h.

mName

QString QgsProcessingParameterDefinition::mName

protected

Parameter name.

Definition at line 886 of file qgsprocessingparameters.h.

mPropertyDefinition

QgsPropertyDefinition QgsProcessingParameterDefinition::mPropertyDefinition

protected

Data defined property definition.

Definition at line 913 of file qgsprocessingparameters.h.

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

• /build/qgis-3.41.0+git20241214+cea29feecf2+99sid/src/core/processing/qgsprocessingparameters.h
• /build/qgis-3.41.0+git20241214+cea29feecf2+99sid/src/core/processing/qgsprocessingparameters.cpp