An widget wrapper for hidden widgets. More...

#include <qgsprocessingwidgetwrapper.h>

Inheritance diagram for QgsProcessingHiddenWidgetWrapper:

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Public Member Functions
	QgsProcessingHiddenWidgetWrapper (const QgsProcessingParameterDefinition parameter=nullptr, QgsProcessingGui::WidgetType type=QgsProcessingGui::Standard, QObject parent=nullptr)
	Constructor for QgsProcessingHiddenWidgetWrapper, for the specified parameter definition and dialog type.

const QgsVectorLayer *	linkedVectorLayer () const override
	Returns the optional vector layer associated with this widget wrapper, or `nullptr` if no vector layer is applicable.

void	setLinkedVectorLayer (const QgsVectorLayer *layer)
	Sets the vector layer linked to the wrapper.

void	setWidgetValue (const QVariant &value, QgsProcessingContext &context) override
	Sets the current value for the parameter to show in the widget.

QVariant	widgetValue () const override
	Returns the current value of the parameter.

Public Member Functions inherited from QgsAbstractProcessingParameterWidgetWrapper
	QgsAbstractProcessingParameterWidgetWrapper (const QgsProcessingParameterDefinition parameter=nullptr, QgsProcessingGui::WidgetType type=QgsProcessingGui::Standard, QObject parent=nullptr)
	Constructor for QgsAbstractProcessingParameterWidgetWrapper, for the specified parameter definition and dialog type.

QgsExpressionContext	createExpressionContext () const override
	This method needs to be reimplemented in all classes which implement this interface and return an expression context.

QLabel *	createWrappedLabel ()
	Creates and returns a new label to accompany widgets created by the wrapper.

QWidget *	createWrappedWidget (QgsProcessingContext &context)
	Creates and return a new wrapped widget which allows customization of the parameter's value.

virtual QVariantMap	customProperties () const
	Returns any custom properties set by the wrapper.

const QgsProcessingParameterDefinition *	parameterDefinition () const
	Returns the parameter definition associated with this wrapper.

QVariant	parameterValue () const
	Returns the current value of the parameter.

virtual void	postInitialize (const QList< QgsAbstractProcessingParameterWidgetWrapper * > &wrappers)
	Called after all wrappers have been created within a particular dialog or context, allowing the wrapper to connect to the wrappers of other, related parameters.

virtual void	registerProcessingContextGenerator (QgsProcessingContextGenerator *generator)
	Registers a Processing context generator class that will be used to retrieve a Processing context for the wrapper when required.

void	registerProcessingParametersGenerator (QgsProcessingParametersGenerator *generator)
	Registers a Processing parameters generator class that will be used to retrieve algorithm parameters for the wrapper when required (e.g.

virtual void	setDialog (QDialog *dialog)
	Sets the parent dialog in which the wrapper is shown.

void	setParameterValue (const QVariant &value, QgsProcessingContext &context)
	Sets the current value for the parameter.

virtual void	setWidgetContext (const QgsProcessingParameterWidgetContext &context)
	Sets the context in which the Processing parameter widget is shown, e.g., the parent model algorithm, a linked map canvas, and other relevant information which allows the widget to fine-tune its behavior.

virtual int	stretch () const
	Returns the Qt layout "stretch" factor to use when adding this widget to a layout.

QgsProcessingGui::WidgetType	type () const
	Returns the dialog type for which widgets and labels will be created by this wrapper.

const QgsProcessingParameterWidgetContext &	widgetContext () const
	Returns the context in which the Processing parameter widget is shown, e.g., the parent model algorithm, a linked map canvas, and other relevant information which allows the widget to fine-tune its behavior.

QLabel *	wrappedLabel ()
	Returns the current wrapped label, if any.

QWidget *	wrappedWidget ()
	Returns the current wrapped widget, if any.

Public Member Functions inherited from QgsExpressionContextGenerator
virtual	~QgsExpressionContextGenerator ()=default

Protected Member Functions
QLabel *	createLabel () override
	Creates a new label to accompany widgets created by the wrapper.

QWidget *	createWidget () override
	Creates a new widget which allows customization of the parameter's value.

Additional Inherited Members
Signals inherited from QgsAbstractProcessingParameterWidgetWrapper
void	widgetValueHasChanged (QgsAbstractProcessingParameterWidgetWrapper *wrapper)
	Emitted whenever the parameter value (as defined by the wrapped widget) is changed.

Protected Attributes inherited from QgsAbstractProcessingParameterWidgetWrapper
QgsProcessingParametersGenerator *	mParametersGenerator = nullptr

QgsProcessingContextGenerator *	mProcessingContextGenerator = nullptr

QgsProcessingParameterWidgetContext	mWidgetContext

Detailed Description

An widget wrapper for hidden widgets.

The hidden widget wrapper allows for creation of a widget wrapper which does not provide a graphical widget, yet still implements the QgsAbstractProcessingParameterWidgetWrapper interface.

Since: QGIS 3.14

Definition at line 685 of file qgsprocessingwidgetwrapper.h.

Constructor & Destructor Documentation

◆ QgsProcessingHiddenWidgetWrapper()

QgsProcessingHiddenWidgetWrapper::QgsProcessingHiddenWidgetWrapper	(	const QgsProcessingParameterDefinition *	parameter = `nullptr`,
		QgsProcessingGui::WidgetType	type = `QgsProcessingGui::Standard`,
		QObject *	parent = `nullptr`
	)

Constructor for QgsProcessingHiddenWidgetWrapper, for the specified parameter definition and dialog type.

Definition at line 457 of file qgsprocessingwidgetwrapper.cpp.

Member Function Documentation

◆ createLabel()

QLabel * QgsProcessingHiddenWidgetWrapper::createLabel ( )

overrideprotectedvirtual

Creates a new label to accompany widgets created by the wrapper.

The caller takes ownership of the returned label. Some parameter type and dialog type combinations will return nullptr for this method. If NULLPTR is returned, then no label should be shown for the parameter's widget (i.e. the label is embedded inside the widget itself).

See also: createWidget()

Reimplemented from QgsAbstractProcessingParameterWidgetWrapper.

Definition at line 493 of file qgsprocessingwidgetwrapper.cpp.

◆ createWidget()

QWidget * QgsProcessingHiddenWidgetWrapper::createWidget ( )

overrideprotectedvirtual

Creates a new widget which allows customization of the parameter's value.

The caller takes ownership of the returned widget.

See also: createLabel()

Implements QgsAbstractProcessingParameterWidgetWrapper.

Definition at line 487 of file qgsprocessingwidgetwrapper.cpp.

◆ linkedVectorLayer()

const QgsVectorLayer * QgsProcessingHiddenWidgetWrapper::linkedVectorLayer ( ) const

overridevirtual

Returns the optional vector layer associated with this widget wrapper, or nullptr if no vector layer is applicable.

This is used to correctly generate expression contexts within the GUI, e.g. to allow expression buttons and property override buttons to correctly show the appropriate vector layer fields.