An interface for Processing widget wrapper factories. More...

#include <qgsprocessingwidgetwrapper.h>

Public Member Functions
virtual	~QgsProcessingParameterWidgetFactoryInterface ()=default

virtual QgsProcessingModelerParameterWidget *	createModelerWidgetWrapper (QgsProcessingModelAlgorithm model, const QString &childId, const QgsProcessingParameterDefinition parameter, QgsProcessingContext &context)
	Creates a new modeler parameter widget for the given parameter. More...

virtual QgsProcessingAbstractParameterDefinitionWidget *	createParameterDefinitionWidget (QgsProcessingContext &context, const QgsProcessingParameterWidgetContext &widgetContext, const QgsProcessingParameterDefinition definition=nullptr, const QgsProcessingAlgorithm algorithm=nullptr)
	Creates a new parameter definition widget allowing for configuration of an instance of the parameter type handled by this factory. More...

virtual QgsAbstractProcessingParameterWidgetWrapper *	createWidgetWrapper (const QgsProcessingParameterDefinition *parameter, QgsProcessingGui::WidgetType type)=0
	Creates a new widget wrapper for the specified parameter definition. More...

virtual QString	parameterType () const =0
	Returns the type string for the parameter type the factory is associated with. More...

Protected Member Functions
virtual QList< int >	compatibleDataTypes (const QgsProcessingParameterDefinition *parameter) const
	Returns a list of compatible Processing data types for inputs for this widget for the specified parameter. More...

virtual QStringList	compatibleOutputTypes () const =0
	Returns a list of compatible Processing output types for inputs for this parameter. More...

virtual QStringList	compatibleParameterTypes () const =0
	Returns a list of compatible Processing parameter types for inputs for this parameter. More...

virtual QString	modelerExpressionFormatString () const
	Returns the expected expression format string for expression results for the parameter within model child algorithms. More...

Detailed Description

An interface for Processing widget wrapper factories.

Widget wrapper factories allow creation of QgsAbstractProcessingParameterWidgetWrapper objects. They are centrally managed by QgsProcessingGuiRegistry. Usually, individual factories are not directly utilized, rather the QgsGui::processingGuiRegistry()->createParameterWidgetWrapper() method is used to create widget wrappers.

Since: QGIS 3.4

Definition at line 514 of file qgsprocessingwidgetwrapper.h.

Constructor & Destructor Documentation

◆ ~QgsProcessingParameterWidgetFactoryInterface()

virtual QgsProcessingParameterWidgetFactoryInterface::~QgsProcessingParameterWidgetFactoryInterface ( )

virtualdefault

Member Function Documentation

◆ compatibleDataTypes()

QList< int > QgsProcessingParameterWidgetFactoryInterface::compatibleDataTypes ( const QgsProcessingParameterDefinition * parameter ) const

protectedvirtual

Returns a list of compatible Processing data types for inputs for this widget for the specified parameter.

In order to determine the available sources for the parameter in a model the types returned by this method are checked. The returned list corresponds to the various available values from QgsProcessing::SourceType.

Subclasses should return a list of all QgsProcessing::SourceType values which can be used as values for the parameter.

See also: compatibleParameterTypes(); compatibleOutputTypes()

Definition at line 373 of file qgsprocessingwidgetwrapper.cpp.

◆ compatibleOutputTypes()

virtual QStringList QgsProcessingParameterWidgetFactoryInterface::compatibleOutputTypes ( ) const

protectedpure virtual

Returns a list of compatible Processing output types for inputs for this parameter.

In order to determine the available sources for the parameter in a model the types returned by this method are checked. The returned list corresponds to the various available values for QgsProcessingOutputDefinition::type().

Subclasses should return a list of all QgsProcessingOutputDefinition::type() values which can be used as values for the parameter.

See also: compatibleParameterTypes(); compatibleDataTypes()

◆ compatibleParameterTypes()

virtual QStringList QgsProcessingParameterWidgetFactoryInterface::compatibleParameterTypes ( ) const

protectedpure virtual

Returns a list of compatible Processing parameter types for inputs for this parameter.

In order to determine the available sources for the parameter in a model the types returned by this method are checked. The returned list corresponds to the various available values for QgsProcessingParameterDefinition::type().

Subclasses should return a list of all QgsProcessingParameterDefinition::type() values which can be used as input values for the parameter.

See also: compatibleOutputTypes(); compatibleDataTypes()

◆ createModelerWidgetWrapper()

QgsProcessingModelerParameterWidget * QgsProcessingParameterWidgetFactoryInterface::createModelerWidgetWrapper	(	QgsProcessingModelAlgorithm *	model,
		const QString &	childId,
		const QgsProcessingParameterDefinition *	parameter,
		QgsProcessingContext &	context
	)

virtual

Creates a new modeler parameter widget for the given parameter.

This widget allows configuration of the parameter's value when used inside a Processing model.

The ID of the child algorithm within the model must be specified via the childId argument. This value corresponds to the QgsProcessingModelChildAlgorithm::childId() string, which uniquely identifies which child algorithm the parameter is associated with inside the given model.

A Processing context must also be specified, which allows the widget to resolve parameter values which are context dependent. The context must last for the lifetime of the widget.

See also: createWidgetWrapper()

Definition at line 358 of file qgsprocessingwidgetwrapper.cpp.

◆ createParameterDefinitionWidget()

QgsProcessingAbstractParameterDefinitionWidget * QgsProcessingParameterWidgetFactoryInterface::createParameterDefinitionWidget	(	QgsProcessingContext &	context,
		const QgsProcessingParameterWidgetContext &	widgetContext,
		const QgsProcessingParameterDefinition *	definition = `nullptr`,
		const QgsProcessingAlgorithm *	algorithm = `nullptr`
	)

virtual

Creates a new parameter definition widget allowing for configuration of an instance of the parameter type handled by this factory.

The context argument must specify a Processing context, which will be used by the widget to evaluate existing definition properties such as default values. Similarly, the widgetContext argument specifies the wider GUI context in which the widget will be used.

The optional definition argument may specify a parameter definition which should be reflected in the initial state of the returned widget. Subclasses must ensure that they correctly handle both the case when a initial definition is passed, or when definition is nullptr (in which case sensible defaults should be shown in the returned widget).

Additionally, the optional algorithm parameter may be used to specify the algorithm or model associated with the parameter.

If a factory subclass returns nullptr for this method (i.e. as the base class implementation does), it indicates that the parameter type cannot be configured via GUI. In this case the parameter type will not be configurable when users add it as an input to their graphical models.

Since: QGIS 3.10

Definition at line 366 of file qgsprocessingwidgetwrapper.cpp.

◆ createWidgetWrapper()

virtual QgsAbstractProcessingParameterWidgetWrapper* QgsProcessingParameterWidgetFactoryInterface::createWidgetWrapper	(	const QgsProcessingParameterDefinition *	parameter,
		QgsProcessingGui::WidgetType	type
	)

pure virtual

Creates a new widget wrapper for the specified parameter definition.

The type argument indicates the dialog type to create a wrapper for.

See also: createModelerWidgetWrapper()

◆ modelerExpressionFormatString()

QString QgsProcessingParameterWidgetFactoryInterface::modelerExpressionFormatString ( ) const

protectedvirtual

Returns the expected expression format string for expression results for the parameter within model child algorithms.

This is shown in modeler widget wrappers when using the "pre-calculated" expression mode, and should give helpful text to users to indicate the expected results from the expression.

This is purely a text format and no expression validation is made against it.

Definition at line 378 of file qgsprocessingwidgetwrapper.cpp.

◆ parameterType()

virtual QString QgsProcessingParameterWidgetFactoryInterface::parameterType ( ) const