A double numeric parameter for volume values. More...

#include <qgsprocessingparameters.h>

Inheritance diagram for QgsProcessingParameterVolume:

[legend]

Public Member Functions
	QgsProcessingParameterVolume (const QString &name, const QString &description=QString(), const QVariant &defaultValue=QVariant(), const QString &parentParameterName=QString(), bool optional=false, double minValue=0, double maxValue=std::numeric_limits< double >::max())
	Constructor for QgsProcessingParameterVolume.

QString	asPythonString (QgsProcessing::PythonOutputType outputType=QgsProcessing::PythonOutputType::PythonQgsProcessingAlgorithmSubclass) const override
	Returns the parameter definition as a Python command which can be used within a Python Processing script.

QgsProcessingParameterVolume *	clone () const override
	Creates a clone of the parameter definition.

Qgis::VolumeUnit	defaultUnit () const
	Returns the default volume unit for the parameter.

QStringList	dependsOnOtherParameters () const override
	Returns a list of other parameter names on which this parameter is dependent (e.g.

bool	fromVariantMap (const QVariantMap &map) override
	Restores this parameter to a QVariantMap.

QString	parentParameterName () const
	Returns the name of the parent parameter, or an empty string if this is not set.

void	setDefaultUnit (Qgis::VolumeUnit unit)
	Sets the default volume unit for the parameter.

void	setParentParameterName (const QString &parentParameterName)
	Sets the name of the parent layer parameter.

QVariantMap	toVariantMap () const override
	Saves this parameter to a QVariantMap.

QString	type () const override
	Unique parameter type name.

Public Member Functions inherited from QgsProcessingParameterNumber
	QgsProcessingParameterNumber (const QString &name, const QString &description=QString(), Qgis::ProcessingNumberParameterType type=Qgis::ProcessingNumberParameterType::Integer, const QVariant &defaultValue=QVariant(), bool optional=false, double minValue=std::numeric_limits< double >::lowest()+1, double maxValue=std::numeric_limits< double >::max())
	Constructor for QgsProcessingParameterNumber.

bool	checkValueIsAcceptable (const QVariant &input, QgsProcessingContext *context=nullptr) const override
	Checks whether the specified input value is acceptable for the parameter.

Qgis::ProcessingNumberParameterType	dataType () const
	Returns the acceptable data type for the parameter.

double	maximum () const
	Returns the maximum value acceptable by the parameter.

double	minimum () const
	Returns the minimum value acceptable by the parameter.

void	setDataType (Qgis::ProcessingNumberParameterType type)
	Sets the acceptable data type for the parameter.

void	setMaximum (double maximum)
	Sets the maximum value acceptable by the parameter.

void	setMinimum (double minimum)
	Sets the minimum value acceptable by the parameter.

QString	toolTip () const override
	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).

QString	valueAsPythonString (const QVariant &value, QgsProcessingContext &context) const override
	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.

Public Member Functions inherited from QgsProcessingParameterDefinition
	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	asScriptCode () const
	Returns the parameter definition encoded in a string which can be used within a Processing script.

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.

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.

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 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	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).

Static Public Member Functions
static QString	typeName ()
	Returns the type name for the parameter class.

Static Public Member Functions inherited from QgsProcessingParameterNumber
static QgsProcessingParameterNumber *	fromScriptCode (const QString &name, const QString &description, bool isOptional, const QString &definition)
	Creates a new parameter using the definition from a script code.

static QString	typeName ()
	Returns the type name for the parameter class.

Additional Inherited Members
Public Types inherited from QgsProcessingParameterDefinition
enum class	ValueAsStringFlag : int { AllowMapLayerValues = 1 << 0 }
	Flags for passing to the valueAsStringPrivate() method. More...

typedef QFlags< ValueAsStringFlag >	ValueAsStringFlags

Protected Member Functions inherited from QgsProcessingParameterDefinition
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 inherited from QgsProcessingParameterDefinition
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.

Detailed Description

A double numeric parameter for volume values.

Linked to a source layer or CRS parameter to determine what units the volume values are in.

The number of decimals places shown in a volume parameter's widget can be specified by setting the parameter's metadata. For example:

param = QgsProcessingParameterVolume( 'VAL', 'Threshold')
# only show two decimal places in parameter's widgets, not 6:
param.setMetadata( {'widget_wrapper':
  { 'decimals': 2 }
})

Since: QGIS 3.40

Definition at line 2506 of file qgsprocessingparameters.h.

Constructor & Destructor Documentation

◆ QgsProcessingParameterVolume()

QgsProcessingParameterVolume::QgsProcessingParameterVolume	(	const QString &	name,
		const QString &	description = `QString()`,
		const QVariant &	defaultValue = `QVariant()`,
		const QString &	parentParameterName = `QString()`,
		bool	optional = `false`,
		double	minValue = `0`,
		double	maxValue = `std::numeric_limits<double>::max()`
	)

explicit

Constructor for QgsProcessingParameterVolume.

Definition at line 7805 of file qgsprocessingparameters.cpp.

Member Function Documentation

◆ asPythonString()

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